JP2019051220A - Detention needle assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indwelling needle assembly having a novel structure capable of preventing an unintended pressing operation of an operating member. SOLUTION: An inner needle 22 is inserted through an outer needle 16 projecting from the tip end side of a housing 26, and an operating member 28 exposed on an outer peripheral surface 27 of the housing 26 is pressed. The indwelling needle assembly 10 in which the inner needle 22 is pulled out from the outer needle 16 by the urging member 122 and is housed in the housing 26, and the operation force for sending the outer needle 16 from the housing 26 to the tip side is exerted. The unit 18 is provided with lock units 42, 118 that prevent the operation member 28 from moving in the pressing direction and that the transmission operation unit 18 sends out the outer needle 16 to release the prevention of such movement, while the transmission operation is performed. Positioning mechanisms 42, 44, 100, 118 for positioning the portion 18 with respect to the operating member 28 in the circumferential direction of the housing 26 are provided. [Selection diagram] Fig. 3

Description

  The present invention relates to an indwelling needle assembly including an outer needle that is punctured and indwelled when performing infusion, blood collection, hemodialysis, and the like, and more particularly, an indwelling needle that can accommodate an inner needle extracted after puncturing. It relates to an assembly.

  Conventionally, an indwelling needle assembly is known as a medical device for performing treatments such as infusion, blood collection, and hemodialysis. As this indwelling needle assembly, the thing as described in Unexamined-Japanese-Patent No. 2015-47493 (patent document 1) is mentioned. The indwelling needle assembly described in Patent Document 1 has a structure in which an inner needle and an outer needle are inserted into and out of each other. After the inner and outer needles are punctured into a patient's blood vessel, the inner needle is pulled out from the outer needle. Thus, the outer needle is placed in a patient's blood vessel and used for treatment.

  By the way, in the indwelling needle assembly described in Patent Document 1, the urging force of the urging member housed in the housing is used when the inner needle is pulled out from the outer needle. That is, before the puncture of the indwelling needle assembly, the operation member provided on the outer peripheral surface of the housing is engaged with the inner needle hub that fixes and supports the inner needle, and the inner needle is biased by the biasing member. It is maintained in a protruding state from the housing against this. Then, after the puncture, by depressing the operation member, the engagement between the operation member and the inner needle hub is released, and the inner needle moves in a direction to be pulled out from the outer needle according to the urging force of the urging member. It is accommodated in the housing.

  However, in the indwelling needle assembly described in Patent Document 1, for example, even when the indwelling needle assembly is in a state before puncturing, the inner needle may be pulled out from the outer needle by unintentionally pushing down the operating member.

JP 2015-47493 A

  The present invention has been made in the background of the above-mentioned circumstances, and its solution is to provide an indwelling needle assembly having a novel structure capable of preventing unintentional pressing of an operating member. is there.

  In the first aspect of the present invention, an inner needle is inserted through an outer needle that protrudes from the distal end side of the housing, and an operation member that is exposed on the outer peripheral surface of the housing is pressed down. In the indwelling needle assembly in which the inner needle is accommodated in the housing by the urging member, the push-down direction of the operation member in the delivery operation portion to which the operation force for feeding the outer needle from the housing to the distal end side is exerted A lock portion is provided that prevents the movement of the outer needle from being moved by the sending operation portion and is prevented from being blocked by the sending operation portion. A positioning mechanism for positioning in a direction is provided.

  In the indwelling needle assembly structured according to this aspect, the sliding operation of the inner needle by the operating member can be prevented by the lock portion until the feeding of the outer needle which is generally performed after puncturing is performed. Therefore, for example, the inner needle is prevented from being accommodated in the housing due to unintentional depression of the operation member before puncturing. In addition, since the blocking by the lock part is released by skillfully using the operation of feeding the outer needle that is generally performed after puncturing, no special operation is required to release the lock, and good operability is demonstrated. Can be done.

  Further, in the indwelling needle assembly according to this aspect, since the delivery operation unit is positioned in the circumferential direction with respect to the operation member, inadvertent rotation of the delivery operation unit can be prevented. The operation can be performed more stably.

  According to a second aspect of the present invention, in the indwelling needle assembly according to the first aspect, the delivery operation portion is constituted by an outer needle hub provided on the proximal end side of the outer needle. .

  According to the indwelling needle assembly structured according to this aspect, the outer needle hub provided in the outer needle can be directly fed out.

  According to a third aspect of the present invention, in the indwelling needle assembly according to the first aspect, the delivery operation unit is disposed between an outer needle hub provided on the proximal end side of the outer needle and the housing. This is constituted by a slider.

  According to the indwelling needle assembly structured according to this aspect, the outer needle can be fed out by operating the slider, and for example, a feeding operation that avoids contact with the outer needle including the outer needle hub is also possible. In addition, it is possible to improve the degree of design freedom of the feeding operation unit constituted by the slider while avoiding the influence on the outer needle including the outer needle hub. Furthermore, since the outer needle can be pushed out without touching the outer needle hub with fingers, contamination of the outer needle hub due to undesired contact can be prevented.

  According to a fourth aspect of the present invention, in the indwelling needle assembly according to any one of the first to third aspects, the delivery operation unit is coaxially positioned with respect to the housing, and the delivery to the distal end side is performed. A support mechanism is provided, and the lock portion is configured by a contact structure in a direction perpendicular to the axis of the housing between the operation member and the delivery operation portion.

  In the indwelling needle assembly structured according to this aspect, the support mechanism can realize coaxial delivery to the housing of the delivery operation unit. In addition, a lock portion that prevents the operation member from being pushed down can be configured using the positioning state of the sending operation portion by the support mechanism.

  According to a fifth aspect of the present invention, in the indwelling needle assembly according to any one of the first to fourth aspects, the positioning mechanism is arranged in the circumferential direction of the housing in the operation member and the delivery operation portion. It is comprised by the contact structure.

  According to the indwelling needle assembly having the structure according to the present aspect, the directing action between the operating member and the sending operation unit realizes the positioning of the sending operation unit with respect to the operating member in the circumferential direction of the housing. The

  According to a sixth aspect of the present invention, in the indwelling needle assembly according to any one of the first to fifth aspects, a positioning recess that opens toward the other is provided on one of the operation member and the delivery operation portion. A positioning projection that protrudes toward the other is provided on the other of the operation member and the delivery operation portion, and the positioning projection is inserted into the positioning recess, and The positioning projection is separated from the positioning recess by sending out the outer needle by the sending operation portion, whereby the lock portion and the positioning mechanism are configured.

  According to the indwelling needle assembly having the structure according to the present aspect, the locking portion that prevents the pressing operation of the operating member by the concave and convex fitting of the positioning concave portion and the positioning convex portion that are separated by the feeding of the outer needle, and the operation member A circumferential positioning mechanism of the delivery operation unit may be configured.

  According to a seventh aspect of the present invention, in the indwelling needle assembly according to any one of the first to sixth aspects, an operation force for feeding the outer needle from the housing to the distal end side is directly applied to the sending operation unit. A projecting projecting piece that can be exerted on the outer periphery of the housing is provided so as to project on the outer periphery at a position corresponding to the operation member of the housing in the circumferential direction.

  In the indwelling needle assembly structured according to this aspect, it is easy to use both the operation member and the delivery protrusion for, for example, a position that can be easily operated on the opposite side of the patient's body surface during puncture. Become.

  According to an eighth aspect of the present invention, in the indwelling needle assembly according to any one of the first to seventh aspects, an inner needle hub provided on the proximal end side of the inner needle is based on the biasing member. It is urged to the end side and is arranged in the housing, and the operation member protrudes into the housing at the front end side in the pressing direction and engages with the inner needle hub so that the urging member An engagement portion for preventing the movement of the inner needle hub is provided, and the engagement portion moves outward of the housing by the movement of the operating member in the pressing direction, so that the engagement with the inner needle hub is prevented. It is intended to be released.

  In the indwelling needle assembly structured according to this aspect, the operation member is released from the direct engagement state with the inner needle hub in accordance with the pressing operation of the operation member, whereby the inner needle is released from the protruding state. It can be switched to the housing state in the housing by the biasing means.

  In the indwelling needle assembly having the structure according to the present invention, the unintentional accommodating operation of the inner needle in the housing by the operation member before the outer needle feeding operation is prevented. Further, inadvertent rotation of the sending operation unit can be prevented, and for example, workability of the sending operation of the sending operation unit can be improved.

The perspective view which shows the indwelling needle assembly as a 1st Embodiment of this invention in an initial state. FIG. 2 is a longitudinal sectional view of the indwelling needle assembly shown in FIG. 1. The longitudinal cross-sectional view which expands and shows the principal part in FIG. The perspective view which shows the operation button which comprises the indwelling needle assembly shown by FIG. 1 in the state of a single item. The longitudinal cross-sectional perspective view of the operation button shown by FIG. The perspective view which shows the state which pushed the outer needle hub ahead of the puncture direction after puncture in the indwelling needle assembly shown by FIG. FIG. 2 is a longitudinal sectional view showing an enlarged main part in a state in which an operation button is pushed down in the indwelling needle assembly shown in FIG. 1 and showing a state before an inner needle moves into a protector. The longitudinal cross-sectional view which shows the state which pushed down the operation button in the indwelling needle assembly shown by FIG. 1, and accommodated the inner needle in the protector. The perspective view which shows the indwelling needle assembly as the 2nd Embodiment of this invention in an initial state. The longitudinal cross-sectional view which expands and shows the principal part of the indwelling needle assembly shown by FIG. The perspective view which shows the operation button which comprises the indwelling needle assembly shown by FIG. 9 in a single item state. FIG. 12 is a longitudinal sectional perspective view of the operation button shown in FIG. 11. FIG. 10 is a perspective view showing a state in which the slider is pushed forward in the puncturing direction after puncturing in the indwelling needle assembly shown in FIG. 9. The longitudinal cross-sectional view which shows the state which pushed down the operation button in the indwelling needle assembly shown by FIG. 9, and accommodated the inner needle in the protector.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIGS. 1 to 3 show an indwelling needle assembly 10 as a first embodiment of the present invention in an initial state (a state before puncturing). The indwelling needle assembly 10 includes an outer needle unit 12 and an inner needle unit 14. That is, the outer needle unit 12 includes an outer needle 16 and an outer needle hub 18 as a delivery operation unit provided on the proximal end side of the outer needle 16. On the other hand, the inner needle unit 14 supports an inner needle 22 having a needle tip 20 at the distal end, an inner needle hub 24 provided on the proximal end side of the inner needle 22, and the inner needle 22 and the inner needle hub 24. And a housing 26. The indwelling needle assembly 10 is configured by inserting the inner needle 22 of the inner needle unit 14 from the proximal end side into the outer needle unit 12. Then, after the indwelling needle assembly 10 is punctured, the inner needle 22 is pulled out from the outer needle 16 while being pulled out from the outer needle 16 by depressing an operation button 28 as an operating member exposed on the outer peripheral surface 27 of the housing 26. The outer needle unit 12 is placed on the patient's skin. In the following description, the axial direction refers to the left-right direction in FIG. 2 that is the needle axial direction of the outer needle 16 and the inner needle 22. Further, the distal end side refers to the left side in FIG. 2 which is the needle tip 20 side of the inner needle 22, while the proximal end side refers to the right side in FIG. 2 which is the side operated by the user. Furthermore, the upward direction and the downward direction refer to the upward direction and the downward direction in FIG. 2, respectively.

  More specifically, in the outer needle unit 12, the outer needle 16 has a tube shape and is made of a material having moderate flexibility, such as ethylene-tetrafluoroethylene copolymer (ETFE), polyurethane, polyether nylon resin. It is formed with various soft resins. In addition, the outer peripheral surface of the front-end | tip part of the outer needle 16 is made into the taper-shaped outer peripheral surface 30, and this can reduce the puncture resistance to a biological body. Further, by providing a through hole in the peripheral wall of the distal end portion of the outer needle 16, it is possible to improve the flow efficiency of the fluid with respect to the outer needle 16.

  Further, the outer needle hub 18 provided on the proximal end side of the outer needle 16 is formed of a hard synthetic resin material such as polypropylene, and has a substantially cylindrical shape having a peripheral wall portion 32 extending in the axial direction as a whole. Yes. The peripheral wall portion 32 of the present embodiment has a stepped and substantially cylindrical shape, and both the inner diameter dimension and the outer diameter dimension are smaller on the distal end side than on the proximal end side. Then, the proximal end of the outer needle 16 is inserted into the distal end portion having a small diameter, and a treatment such as adhesion is performed as necessary, whereby the proximal end of the outer needle 16 is attached to the outer needle hub 18. Fixedly supported. In addition, in the inner peripheral surface 34 and the outer peripheral surface 36 of the outer needle hub 18, the base end side portion having a large diameter has a tapered surface shape that gradually increases in diameter toward the base end side as a whole.

  Further, the proximal end side opening 38 in the outer peripheral surface 36 of the outer needle hub 18 is provided with a substantially annular flange portion 40 projecting to the outer peripheral side, and a male screw is formed on the outer peripheral surface of the flange portion 40. Yes. By forming the male screw, after the outer needle unit 12 is placed on the patient's skin, for example, a luer lock type syringe or the like can be connected to the proximal end side opening 38 of the outer needle hub 18. It has become.

  The flange portion 40 is provided with a lock groove 42 as a positioning recess extending in the axial direction in a part of the circumference (upper side in FIG. 2). The lock groove 42 opens to the outer peripheral side (upward) and is formed over the entire length of the flange portion 40 in the thickness direction (axial direction). The distal end side end surface and the proximal end side of the flange portion 40 Open to the end face. The groove depth dimension (diameter dimension) of the lock groove 42 is substantially the same as the protrusion dimension of the flange portion 40 from the outer peripheral surface 36 of the outer needle hub 18. In short, the flange portion 40 is divided in the circumferential direction by the lock groove 42, and both circumferential portions 42 a and 42 a sandwiching the lock groove 42 in the flange portion 40 face each other with a predetermined distance therebetween. .

  On the other hand, a positioning groove 44 extending in the axial direction is provided in the flange portion 40 on the opposite side in the radial direction from the lock groove 42. The positioning groove 44 is also open on the outer peripheral side (downward) and is formed over the entire length of the flange portion 40 in the thickness direction (axial direction). Open to the side end face. Further, the groove depth dimension (diameter direction dimension) of the positioning groove 44 is substantially equal to the projecting dimension of the flange portion 40 from the outer peripheral surface 36 of the outer needle hub 18. The groove 44 is also divided in the circumferential direction.

  In addition, on the outer peripheral surface 36 of the outer needle hub 18, an operation piece 46 as a projecting projecting piece that protrudes to the outer peripheral side (upward) is provided on a part of the periphery (upward in FIG. 2). In the present embodiment, the operation piece 46 has a substantially rectangular plate shape having a predetermined width dimension, and after the indwelling needle assembly 10 is punctured, the user places his / her finger on the operation piece 46 and the outer needle hub. 18 is sent forward (front end side) in the puncture direction. That is, when the outer needle hub 18 is sent to the distal end side, an operating force for feeding the outer needle hub 18 to the distal end side is directly exerted on the operation piece 46.

  Further, a positioning protrusion 47 for a hemostasis valve mechanism that protrudes toward the inner peripheral side is provided at an axially intermediate portion of the inner peripheral surface 34 of the outer needle hub 18. In this embodiment, the four positioning protrusions 47, 47, 47, 47 are formed at substantially equal intervals on the circumference.

  Furthermore, a hemostasis valve mechanism 48 is accommodated in the outer needle hub 18. The structure of the hemostasis valve mechanism 48 is not limited in any way, but in this embodiment, the hemostasis valve mechanism 48 includes a hemostasis valve 50, a pusher 52, and a pusher guide 54.

  The hemostasis valve 50 is a disc valve having a slit 56 formed at the center, and is formed of a rubber elastic body or elastomer having elasticity. In addition, although the shape of the slit 56 is not limited at all such as a single character shape or a cross character shape, in the present embodiment, the slit 56 has a radial shape extending from the center in three circumferential directions at substantially equal intervals (approximately every 120 °). Has been.

  Further, the pusher 52 as a whole has a substantially cylindrical shape, and the inner diameter is larger than the outer diameter of the inner needle 22. Furthermore, the pusher guide 54 has a substantially cylindrical shape as a whole, and the inner diameter dimension is substantially equal to or slightly larger than the maximum outer diameter dimension at the distal end portion of the pusher 52, while the outer diameter dimension is the outer needle. The inner diameter of the hub 18 is substantially equal. An annular groove 58 that opens to the outer peripheral side is formed on the outer peripheral surface of the pusher guide 54.

  When the hemostasis valve 50 is in a single product state before being assembled to the outer needle hub 18, the outer diameter is slightly larger than the inner diameter of the peripheral wall portion 32 of the outer needle hub 18. Thus, when the hemostasis valve 50 is assembled to the outer needle hub 18, the hemostasis valve 50 is compressed in the radial direction (for example, the vertical direction in FIG. 2), and is accommodated and disposed in a state where the slit 56 is closed inside the outer needle hub 18. ing. Further, a pusher 52 and a pusher guide 54 are located on the proximal end side of the hemostasis valve 50 so as to be inserted into and out of each other. That is, the pusher guide 54 is disposed between the pusher 52 and the outer needle hub 18 in the radial direction, and the positioning protrusion 47 of the outer needle hub 18 and the annular groove 58 of the pusher guide 54 are mutually connected. The pusher guide 54 is assembled to the outer needle hub 18 by fitting the concave and convex portions. Further, the outer peripheral surface at the tip of the pusher 52 is substantially in contact with the inner peripheral surface of the pusher guide 54, and the pusher 52 slides in the length direction (axial direction) with respect to the pusher guide 54. And can be moved. Further, in the present embodiment, in the initial state, the distal end surfaces of the pusher 52 and the pusher guide 54 are located in contact with the proximal end surface of the hemostasis valve 50.

  In the initial state shown in FIG. 1 and the like, the inner needle 22 is inserted into the hemostasis valve 50, and after the puncture of the indwelling needle assembly 10, the inner needle 22 is moved to the proximal end side as will be described later. As a result, the slit 56 of the hemostasis valve 50 is closed. Further, after the outer needle unit 12 is placed on the patient's skin, a male luer such as a syringe is inserted from the proximal end side opening 38 of the outer needle hub 18 so that the tip of the male luer pushes the pusher 52 into the tip. The slits 56 of the hemostasis valve 50 are opened by being pushed in the direction and the pusher 52 is guided by the pusher guide 54 and moved to the distal end side. As a result, the inside of the outer needle 16, the inside of the outer needle hub 18 (the inside of the pusher 52), and the inside of the syringe or the like are communicated, and, for example, the drug solution in the syringe passes through the outer needle unit 12 into the patient's blood vessel. Injected. It should be noted that the syringe 52 is pulled out from the outer needle unit 12 after the injection of the chemical solution or when the injection is interrupted, whereby the pusher 52 is pushed back to the initial position by the elastic restoring action of the hemostasis valve 50 and the slit 56 is quickly moved. It is supposed to be closed.

  On the other hand, the inner needle 22 in the inner needle unit 14 is a hollow needle having a sharp needle tip 20, and is formed of a known material such as stainless steel, aluminum, titanium, or an alloy thereof. That is, the needle tip 20 of the inner needle 22 is formed with a blade surface 60 that spreads in a direction inclined with respect to the axial direction so that the inner needle 22 can be easily punctured into the patient's skin or the like. It has become. In the present embodiment, the blade surface 60 faces upward. The inner needle 22 may be a solid needle.

  Further, the outer diameter dimension of the inner needle 22 is smaller than the inner diameter dimension of the outer needle 16, and when the inner needle 22 and the outer needle 16 are inserted inside and outside, the distance between the inner needle 22 and the outer needle 16 in the radial direction is reduced. An annular gap 62 is formed. That is, a gap 62 between the inner needle 22 and the outer needle 16 in the radial direction communicates with the inner space of the outer needle hub 18. Furthermore, a through hole 63 that penetrates the peripheral wall of the inner needle 22 is provided at the distal end portion of the inner needle 22, and blood that has flowed into the inner needle 22 when the indwelling needle assembly 10 is punctured Through the hole 63 and the gap 62, the outer needle hub 18 flows back to the portion closed by the hemostasis valve 50. Therefore, by forming the outer needle hub 18 from a transparent material, reverse blood (flashback) can be easily confirmed when the indwelling needle assembly 10 is punctured.

  Furthermore, the inner needle hub 24 provided on the proximal end side of the inner needle 22 is made of a hard synthetic resin material such as polypropylene, and has a substantially cylindrical shape as a whole. An annular step surface 64 is formed on the inner peripheral surface of the inner needle hub 24, and the tip side of the step surface 64 is a small-diameter portion 66 having a smaller inner diameter, and the base surface than the step surface 64. The end side is a large diameter portion 68 having a larger inner diameter than the small diameter portion 66. The inner diameter dimension of the small-diameter portion 66 is substantially equal to or slightly larger than the outer diameter dimension of the inner needle 22, and the proximal end of the inner needle 22 is inserted into the small-diameter portion 66, and if necessary. The base end of the inner needle 22 is fixed to the small-diameter portion 66 by processing such as adhesion, and the base end of the inner needle 22 is fixedly supported by the inner needle hub 24.

  Further, the outer diameter dimensions of the small diameter portion 66 and the large diameter portion 68 are substantially equal to each other, and the outer peripheral surface of the small diameter portion 66 and the outer peripheral surface of the large diameter portion 68 have no step and are axial. Are continuous with each other. In the present embodiment, the distal end portion of the small diameter portion 66 has a tapered shape substantially corresponding to the proximal end side opening 38 of the outer needle hub 18, and as will be described later, the distal end portion (insertion portion 124) of the small diameter portion 66. ) Is inserted into the outer needle hub 18 from the proximal end side opening 38 of the outer needle hub 18, the outer periphery of the inner peripheral surface 34 of the outer needle hub 18 and the distal end portion (insertion portion 124) of the small diameter portion 66. The surface is in contact with the surface with almost no gap. However, the outer diameter dimension at the distal end portion of the small diameter portion 66 may be smaller than the inner diameter dimension at the proximal end side opening 38 of the outer needle hub 18, and the inner peripheral surface of the outer needle hub 18 and the distal end portion of the small diameter portion 66. A gap may be formed between the outer peripheral surface of the (insertion portion 124).

  Note that, for example, a filter that allows liquid to pass but not allow gas to pass therethrough is provided at the proximal end opening of the inner needle hub 24 (that is, the proximal end opening of the large diameter portion 68). Thereby, when the indwelling needle assembly 10 is punctured, blood that has flowed in through the inner hole of the inner needle 22 is stored in the large-diameter portion 68 and blood leaks from the proximal-end opening of the inner needle hub 24. Can be prevented. By forming the inner needle hub 24 and the housing 26 from a transparent material, reverse blood (flashback) is confirmed by the blood stored in the large diameter portion 68 when the indwelling needle assembly 10 is punctured. It may be like this.

  Further, a guide concave groove 70 (see FIG. 6 and the like) is provided on the outer peripheral surface of the inner needle hub 24 and extends over the entire length in the axial direction and opens to the outer peripheral side. In the present embodiment, the guide groove 70 has a substantially rectangular cross-sectional shape, and four guide grooves 70, 70, 70, 70 are formed at substantially equal intervals on the outer periphery of the inner needle hub 24. Has been.

  Further, on the outer peripheral surface of the inner needle hub 24, a substantially annular flange-like portion 72 that protrudes to the outer peripheral side is formed at the base end side opening (that is, the base end side opening of the large diameter portion 68). . On the outer peripheral surface of the flange-like portion 72, a concave groove (not shown) extending in the axial direction and opening to the outer peripheral side is provided at a position corresponding to the four guide concave grooves 70, 70, 70, 70. ing. In other words, guide concave grooves 70, 70, 70, 70 provided on the outer peripheral surface of the inner needle hub 24 are also formed over the flange-shaped portion 72.

  Furthermore, on the outer peripheral surface of the inner needle hub 24, an engaging recess 74 that opens to the outer peripheral side is formed in the axially intermediate portion (that is, the axially intermediate portion of the small diameter portion 66). The engaging recess 74 is formed in a part of the circumference (lower part in FIG. 2), and is open downward in this embodiment.

  The inner needle hub 24 having such a structure is supported by a housing 26. That is, the housing 26 has a generally bottomed cylindrical shape as a whole, and the inner needle hub 24 is disposed inside the housing 26. The housing 26 is formed of a hard synthetic resin similar to the outer needle hub 18 and the inner needle hub 24. The housing 26 includes a substantially cylindrical housing main body 76 and a cap 80 that closes the proximal end side opening 78 of the housing main body 76. The cap 80 has a generally disc shape as a whole, and an annular projecting portion 82 projecting from the distal end side end surface to the distal end side is fitted into the proximal end side opening 78 of the housing main body 76, and if necessary. Thus, the cap 80 is fixed to the proximal end side opening 78 of the housing main body 76 by performing the welding and bonding processes. Further, a through-hole 84 that penetrates in the thickness direction is formed in the central portion of the cap 80, and when the inner needle hub 24 moves inside the housing 26 as described later, air inside the housing 26 It is discharged to the outside through the through hole 84. Thereby, the possibility that the movement of the inner needle hub 24 is hindered by the action of the air spring by the air inside the housing 26 can be reduced.

  Further, the housing body 76 of the present embodiment includes a cylindrical peripheral wall portion 86 having an axial dimension larger than the axial dimension from the needle tip 20 of the inner needle 22 to the proximal end of the inner needle hub 24. The inner diameter dimension of the peripheral wall portion 86 is substantially constant over substantially the entire length in the axial direction, and is slightly larger than the outer diameter dimension of the flange-shaped portion 72 at the proximal end of the inner needle hub 24. In addition, in the front end side opening 88 of the housing main body 76, the inner diameter dimension of the peripheral wall portion 86 is made smaller than the other portions, and is made smaller than the outer diameter dimension of the flange-like portion 72 in the inner needle hub 24. It is substantially equal to or slightly larger than the outer diameter of the portions other than the flange-like portion 72 (small diameter portion 66 and large diameter portion 68). Accordingly, the inner needle hub 24 disposed in the housing 26 can be moved in the axial direction in the housing 26, and can be prevented from falling out of the housing 26 through the distal end side opening 88. In the present embodiment, the inner diameter of the distal end side opening 88 of the housing body 76 is substantially equal to the inner diameter of the proximal end opening 38 of the outer needle hub 18.

  An insertion hole 90 penetrating in the vertical direction is formed at the tip of the peripheral wall portion 86. The insertion hole 90 has a substantially rectangular shape in plan view, and the width direction dimension (dimension in the direction perpendicular to the paper surface in FIG. 2) is larger than the axial dimension. The width direction dimension of the insertion hole 90 is smaller than the width direction dimension (outer diameter dimension) of the peripheral wall portion 86, and the insertion hole 90 passes through the upper portion and the lower portion of the cylindrical peripheral wall portion 86. Openings are made on the upper and lower sides of the outer peripheral surface 27 of the housing 26.

  In addition, a fitting groove 94 extending in the axial direction is formed on a part of the outer periphery 27 of the distal end side opening 88 of the housing 26 (housing main body 76) on the periphery (upward in FIG. 2). The fitting groove 94 is provided on the top side of the insertion hole 90 on the upper side of the housing main body 76 and communicates with the insertion hole 90. The groove width dimension of the fitting groove 94 (dimension in the direction perpendicular to the paper surface in FIG. 2) is substantially equal to the groove width dimension of the lock groove 42 provided in the flange portion 40 of the outer needle hub 18. That is, both circumferential side (width direction) side portions 94a and 94a sandwiching the fitting groove 94 in the peripheral wall portion 86 face each other with a predetermined distance therebetween.

  Further, on the outer peripheral surface 27 of the housing 26 (housing main body 76), an encircling protrusion 96 that protrudes to the outer peripheral side (upward) is formed on a part of the periphery (upward in FIG. 2). The surrounding protrusion 96 has a substantially triangular longitudinal section and extends in a substantially U-shape or a substantially U-shape, and is open to the front end side. Further, the surrounding protrusion 96 is provided on the base end side with respect to the insertion hole 90, and the distal end side opening of the surrounding protrusion 96 is communicated with the insertion hole 90. That is, an area surrounded by the surrounding protrusions 96 is an arrangement area 98 that is concave upward with respect to the surrounding protrusions 96. In the present embodiment, the bottom surface of the arrangement region 98, that is, the portion 27 a surrounded by the surrounding protrusion 96 on the outer peripheral surface 27 of the housing 26 is located on the inner peripheral side with respect to the other portions on the outer peripheral surface 27. Thus, a large vertical dimension of the arrangement region 98 is secured. Further, by providing the portion 27a surrounded by the surrounding protrusion 96 on the inner peripheral side with respect to the other portions of the outer peripheral surface 27, the protruding height of the surrounding protrusion 96 can be made relatively high. The up and down direction guiding action when the operation button 28 is pressed by the surrounding protrusion 96 can be more effectively exhibited.

  Furthermore, a positioning protrusion 100 that protrudes toward the distal end side is formed in the distal end side opening 88 of the housing body 76 on the opposite side of the fitting groove 94 in the radial direction. The positioning protrusion 100 has a substantially rectangular shape in plan view, and the width direction dimension of the positioning protrusion 100 is substantially equal to the width direction dimension of the positioning groove 44 provided in the flange portion 40 of the outer needle hub 18. Or slightly smaller.

  On the other hand, a guide projection 104 is formed on the inner peripheral surface 102 of the housing main body 76 so as to protrude from the peripheral wall portion 86 toward the inner peripheral side. The guide protrusion 104 has a substantially rectangular cross-sectional shape, and is formed over substantially the entire length in the axial direction on the base end side with respect to the insertion hole 90 in the peripheral wall portion 86. In the present embodiment, such guide protrusions 104 are formed at four locations on the circumference at circumferential positions corresponding to the concave grooves (guide concave grooves 70) provided on the outer peripheral surface of the flange-like portion 72 of the inner needle hub 24. Has been. Further, at the distal ends of the guide projections 104, 104, 104, 104, that is, at the portion adjacent to the proximal end side with respect to the insertion hole 90, the inward projections 106, 106 having a projecting dimension toward the inner peripheral side increased. , 106, 106 (see FIG. 8).

  An operation button 28 as shown in FIGS. 4 and 5 is assembled to the housing 26 having the above structure. The operation button 28 is made of a hard synthetic resin similar to the housing 26, and has a base portion 108 having a shape similar to that of a region (arrangement region 98) surrounded by the surrounding projection 96 in a plan view. I have. The upper surface 110a of the base portion 108 is a curved surface that protrudes upward, while the lower surface 110b is a flat surface that extends in the axial direction. As described above, since the upper surface 110a of the base portion 108 is a curved surface, a large contact area with the user's finger is ensured when the operation button 28 is pressed, and the operability of the pressing operation is improved. Can be illustrated.

  An annular portion 112 that protrudes downward is formed at the tip portion of the base portion 108. That is, the annular portion 112 has a substantially rectangular plate shape whose outer shape is larger in the vertical direction than in the width direction when viewed in the axial direction, and has a substantially circular inner hole 114 at the center. It is formed penetrating in the thickness direction (axial direction). The upper portion of the annular portion 112 is formed integrally with the base portion 108. The inner diameter dimension of the annular portion 112 (the diameter dimension of the inner hole 114) is substantially the same as the inner diameter dimension of the peripheral wall portion 86 in the housing main body 76 (the inner diameter dimension of the portion other than the portion where the inner diameter is reduced in the distal end side opening 88). Are equal. In addition, the axial direction dimension and the width direction dimension of the annular part 112 are substantially equal to or slightly smaller than the axial direction dimension and the width direction dimension of the insertion hole 90 in the peripheral wall part 86 of the housing body 76, respectively.

  Further, in the annular portion 112, the side opposite to the side where the base portion 108 is provided (that is, the lower side which is the front end side in the pressing direction of the operation button 28) protrudes to the inner peripheral side (upward). An engaging convex portion 116 is provided as an engaging portion. In other words, the inner diameter of the annular portion 112 is reduced at the position where the engaging convex portion 116 is formed, and the inner diameter dimension at the position where the engaging convex portion 116 is formed, that is, the vertical direction between the base portion 108 and the engaging convex portion 116. The separation distance is substantially equal to the inner diameter dimension of the distal end side opening 88 in the housing main body 76.

  Here, a lock protrusion 118 as a positioning protrusion protruding toward the front end is provided at the center of the width of the base portion 108 (in the direction orthogonal to the paper surface in FIG. 2). However, the contact portion 120 is bent and protrudes toward the inner peripheral side (downward). The width direction dimension of the lock protrusion 118 is substantially the same as the groove width dimension of the fitting groove 94 provided in the distal end side opening 88 of the housing body 76 and the lock groove 42 provided in the flange portion 40 of the outer needle hub 18. It is equal or slightly smaller.

  The inner needle unit 14 includes the inner needle 22, the inner needle hub 24, the housing 26, and the operation button 28 having the above-described structure. That is, the inner needle 22 is fixed to the inner needle hub 24, the inner needle 22 and the inner needle hub 24 are inserted from the proximal end side opening 78 of the housing body 76, and the proximal end side opening 78 is the cap. The inner needle hub 24 is accommodated in the housing 26 by being closed at 80. When the inner needle hub 24 and the housing 26 are assembled, the guide protrusion 104 provided on the inner peripheral surface 102 of the housing main body 76 is formed in the groove provided in the flange-like portion 72 of the inner needle hub 24. The inner protrusion 106 provided at the tip of the guide protrusion 104 is inserted into the guide groove 70 provided on the outer peripheral surface of the inner needle hub 24. This prevents relative rotation of the inner needle 22 and inner needle hub 24 and the housing 26 in the circumferential direction, and the circumferential positions of the blade surface 60 of the inner needle 22 and the operation button 28 are aligned. Both are directed upwards.

  An operation button 28 is assembled to the housing 26. That is, the annular portion 112 of the operation button 28 is inserted from above into the insertion hole 90 provided at the distal end portion of the housing main body 76, and to the arrangement region 98 surrounded by the surrounding protrusion 96. A base portion 108 is accommodated. In other words, in the present embodiment, the operation button 28 is exposed and disposed in an arrangement region 98 provided on the outer peripheral surface 27 of the housing 26 (housing main body 76), and the operation button 28 is positioned above the housing 26. doing. The operation button 28 can be moved in the vertical direction with respect to the housing 26 by disposing the bottom surface 27a of the arrangement region 98 and the lower surface 110b of the base portion 108 apart from each other in the vertical direction. . In the initial state, a lock protrusion 118 that protrudes from the base portion 108 to the front end side is located on the outer peripheral side (upward) of the fitting groove 94 provided in the front end side opening 88 of the housing body 76.

  Further, as described above, the annular portion 112 is inserted into the insertion hole 90 and / or the base portion 108 is accommodated and disposed in the arrangement region 98, so that the housing 26 and the operation button 28 are surrounded. Relative rotation in the direction is prevented. That is, the wall portions 112 a and 112 a on both sides in the width direction sandwiching the inner hole 114 among the wall portions constituting the annular portion 112 are the wall portions 86 a on both sides in the width direction sandwiching the insertion hole 90 in the peripheral wall portion 86 of the housing body 76. , 86a, the circumferential rotation of the housing 26 and the operation button 28 is prevented. Alternatively, the base portion 108 abuts on the surrounding protrusion 96, so that relative rotation in the circumferential direction between the housing 26 and the operation button 28 is prevented. Note that the relative rotation prevention mechanism between the housing 26 and the operation button 28 can be any of the case where the annular portion 112 is inserted into the insertion hole 90 and the base portion 108 is accommodated in the arrangement region 98. You may be comprised only by either.

  In the initial state, the inner needle 22 and the inner needle hub 24 are inserted into the inner hole 114 of the annular portion 112 inserted into the insertion hole 90, and the engaging convex portion provided below the annular portion 112. 116 is fitted into and engaged with an engaging recess 74 that opens in the lower surface of the inner needle hub 24. Thereby, the distal end portions of the inner needle 22 and the inner needle hub 24 are held in a state of protruding from the housing 26 toward the distal end side. In other words, in the housing 26, the engagement convex portion 116 protrudes toward the inner peripheral side, and the engagement convex portion 116 and the engagement concave portion 74 of the inner needle hub 24 engage with each other. The axial movement of the inner needle hub 24 is prevented.

  Here, a coil spring 122 as an urging member is disposed between the inner needle hub 24 and the housing 26. That is, a coil spring is provided between the flange-shaped portion 72 provided at the proximal end of the inner needle hub 24 and the inner protrusions 106, 106, 106, 106 that protrude toward the inner peripheral side at the distal end portion of the housing 26. 122 is provided. In the initial state, the flange-like portion 72 and the inward protruding portions 106, 106, 106, 106 are in a state of being close to each other, and the coil spring 122 is formed by the flange-like portion 72 and the inwardly protruding portion 106. It is compressed. As a result, the inner needle hub 24 is biased toward the proximal end of the housing 26 due to the elastic restoring force of the coil spring 122. Then, the movement of the inner needle hub 24 to the proximal end side of the housing 26 due to the urging force is prevented by the engagement between the engagement convex portion 116 and the engagement concave portion 74.

  The indwelling needle assembly 10 of the present embodiment is configured by assembling the outer needle unit 12 to the inner needle unit 14 having such a structure. That is, the inner needle 22 is inserted from the proximal end side opening 38 of the outer needle hub 18, passes through the hemostasis valve mechanism 48 and the outer needle 16, and the needle tip 20 of the inner needle 22 protrudes from the outer needle 16. Yes. Further, the distal end portion of the inner needle hub 24 enters the inside of the outer needle hub 18 from the proximal end side opening 38 of the outer needle hub 18. As a result, the distal end portion of the inner needle hub 24 serves as an insertion portion 124 that enters the inside from the proximal end side opening 38 of the outer needle hub 18. In the present embodiment, the outer diameter dimension of the distal end portion (small diameter portion 66) of the inner needle hub 24 is substantially equal to the inner diameter dimension of the proximal end side opening 38 of the outer needle hub 18, so that the insertion portion The outer peripheral surface of 124 and the inner peripheral surface 34 of the outer needle hub 18 are in contact with each other without a substantial gap. However, a gap may be formed between the outer peripheral surface of the insertion portion 124 and the inner peripheral surface 34 of the outer needle hub 18. The distal end opening 88 of the housing 26 (housing main body 76) is located adjacent to the proximal opening 38 of the outer needle hub 18 in the axial direction, in other words, the distal end of the housing 26. The outer needle hub 18 is located on the side.

  In the assembled state of the inner needle unit 14 and the outer needle unit 12, the lock protrusion 118 that protrudes from the base portion 108 to the distal end side of the operation button 28 extends to the outer peripheral side of the flange portion 40 of the outer needle hub 18. The abutment portion 120 that is the tip of the lock protrusion 118 is inserted into the lock groove 42 provided in the flange portion 40 of the outer needle hub 18 from the outer peripheral side (upper side). That is, the abutment portion 120 of the lock protrusion 118 abuts on the circumferential side portions 42a, 42a sandwiching the lock groove 42 in the flange portion 40 in the circumferential direction, whereby the operation button 28 and the outer needle hub 18, that is, the inner needle hub 18, The relative rotation in the circumferential direction between the needle unit 14 and the outer needle unit 12 is prevented. Therefore, in this embodiment, one of the positioning mechanisms for positioning the outer needle hub 18 in the circumferential direction with respect to the operation button 28 includes the lock protrusion 118 and the lock groove 42.

  Further, in the assembled state of the inner needle unit 14 and the outer needle unit 12, the positioning protrusion 100 provided on the opposite side of the lock protrusion 118 in the radial direction in the inner needle unit 14 is the flange portion 40 of the outer needle hub 18. Is inserted into a positioning groove 44 provided in the. In other words, the housing 26 and the outer needle hub 18, that is, the inner needle unit 14 and the outer needle unit 12, also come from the circumferential contact between the positioning protrusions 100 on both sides of the flange portion 40 sandwiching the positioning groove 44. Relative rotation in the circumferential direction is prevented. Here, since the operation button 28 is assembled to the housing 26 so as not to rotate in the circumferential direction, the outer needle hub 18 is moved relative to the operation button 28 by inserting the positioning protrusion 100 into the positioning groove 44. Positioned in the circumferential direction through the housing 26. Therefore, another positioning mechanism for positioning the outer needle hub 18 in the circumferential direction with respect to the operation button 28 includes a relative rotation prevention mechanism between the operation button 28 and the housing 26, a positioning projection 100, and a positioning groove 44. It consists of

  Then, the contact portion 120 of the lock protrusion 118 is inserted from the outer peripheral side (above) of the lock groove 42 in this way, so that the peripheral wall portion 32 of the outer needle hub 18 is locked at the position where the flange portion 40 is formed. It is sandwiched in the radial direction by the contact portion 120 of the projecting piece 118 and the insertion portion 124 which is the tip portion of the inner needle hub 24. The peripheral wall portion 32 of the outer needle hub 18 and the contact portion 120 and / or the insertion portion 124 of the lock protrusion 118 may be in contact with each other or separated from each other by a predetermined distance. May be.

  Here, since the contact portion 120 of the lock protrusion 118 is inserted from the outer peripheral side (above) of the lock groove 42, the peripheral wall of the outer needle hub 18, where the contact portion 120 is the groove bottom surface of the lock groove 42. By making contact with the portion 32 (outer peripheral surface 36) in the direction perpendicular to the axis of the housing 26, that is, in the vertical direction, the operation button 28 cannot be moved downward (pressing operation). That is, in the present embodiment, the lock portion that disables the pressing operation of the operation button 28 is configured by inserting the lock protrusion 118 from the outer peripheral side of the lock groove 42. Since the lock groove 42 and the lock protrusion 118 are provided on the operation button 28 located on the upper side of the outer needle hub 18 and the upper side of the housing 26, respectively, the lock portion is located on the upper side of the indwelling needle assembly 10, that is, At the same position on the periphery as the operation button 28, it is exposed on the outer peripheral side. Note that the lower end surface of the contact portion 120 does not need to be in contact with the groove bottom surface of the lock groove 42 (the outer peripheral surface 36 of the outer needle hub 18), and the operation button 28 moves downward to engage the engagement convex portion 116. The lower end surface of the contact portion 120 and the groove bottom surface of the lock groove 42 may be separated so that the engagement between the engagement recess 74 and the engagement recess 74 is not released.

  In the indwelling needle assembly 10 in the initial state, the central axis of the outer needle hub 18 and the central axis of the housing 26 are aligned with each other, and the outer needle hub 18 is positioned substantially coaxially with respect to the housing 26. Has been supported. In this embodiment, the support mechanism that positions and supports the outer needle hub 18 substantially coaxially with respect to the housing 26 is such that the insertion portion 124, which is the distal end portion of the inner needle hub 24, opens on the proximal end side of the outer needle hub 18. Inserted from the portion 38, the outer peripheral surface of the insertion portion 124 and the inner peripheral surface 34 of the outer needle hub 18 are brought into contact with each other without a substantial gap. In particular, the insertion portion 124 is inserted with a certain degree of fitting force into the proximal end side opening 38 of the outer needle hub 18, thereby preventing the outer needle unit 12 from unintentionally falling off the inner needle unit 14. obtain.

  The indwelling needle assembly 10 having the above structure is punctured into a patient's blood vessel with the inner needle 22 and the outer needle 16 inserted and removed as shown in FIGS.

  Then, after confirming the flashback, a finger is placed on the operation piece 46 protruding upward from the outer peripheral surface 36 of the outer needle hub 18, and the outer needle unit 12 is fed forward (tip side) in the puncture direction. Thereby, as shown in FIG. 6, the outer needle unit 12 is moved to the distal end side with respect to the inner needle unit 14, and the distal end of the outer needle 16 is pushed deeper into the blood vessel of the patient. That is, in the present embodiment, the outer needle hub 18 constitutes a feeding operation portion that exerts an operating force for feeding the outer needle 16 toward the distal end side with respect to the housing 26. In particular, in the present embodiment, the outer needle hub 18 is sent out to the distal end side in a state of being coaxially positioned with respect to the housing 26 by the support mechanism.

  In addition, the inner needle unit 14 may be pulled out rearward (base end side) in the puncture direction while the outer needle unit 12 is fed forward in the puncture direction. Thereby, the needle tip 20 of the inner needle 22 can be detached from the blood vessel of the patient. In such a state, the proximal end side opening 38 of the outer needle hub 18 and the distal end side opening 88 of the housing 26 (housing main body 76) are separated from each other in the axial direction, and the locking protrusion 118 is formed in the locking groove 42. Have been withdrawn from.

  That is, by pushing the outer needle unit 12 toward the distal end side with respect to the inner needle unit 14, the contact portion 120 of the lock protrusion 118 is separated from the lock groove 42, and the contact portion 120 of the lock protrusion 118 is The mechanism for preventing the operation button 28 from being pressed is released when the lock groove 42 comes into contact with the groove bottom surface (the peripheral wall portion 32 of the outer needle hub 18). Accordingly, by pushing the outer needle unit 12 forward in the puncturing direction, the operation button 28 can be pressed (moved downward in the pressing direction).

  Then, as shown in FIG. 7, fingers are placed on the upper surface 110 a of the operation button 28 and the operation button 28 is pushed down. As a result, the base portion 108 of the operation button 28 moves downward in the arrangement region 98, the lower surface 110b of the base portion 108 and the bottom surface 27a of the arrangement region 98 are overlapped with each other, and the housing 26 (housing main body 76). The lock protrusion 118 of the operation button 28 is inserted into the fitting groove 94 provided in the front end side opening 88. Further, when the annular portion 112 of the operation button 28 moves downward, the engagement convex portion 116 comes out of the engagement concave portion 74 and the engagement is released. That is, when the annular portion 112 moves downward, the engaging convex portion 116 protruding from the inner peripheral surface 102 of the housing 26 (housing main body 76) to the inner peripheral side (upward) moves to the outer peripheral side (downward). The inner peripheral surface 102 of the housing 26 is substantially straight over substantially the entire length in the axial direction. As a result, the inner needle hub 24 can move in the housing 26 in the axial direction.

  As a result, as shown in FIG. 8, the inner needle hub 24 and the inner needle 22 are moved to the proximal end side in the housing 26 according to the biasing force based on the elastic restoring force of the coil spring 122. The inner needle 22 is pulled out from the outer needle 16. In the present embodiment, since the axial dimension of the housing 26 is larger than the axial dimension from the needle tip 20 of the inner needle 22 to the proximal end of the inner needle hub 24, the inner needle hub 24 and the inner needle 22. The needle tip 20 of the inner needle 22 is covered and protected by the housing 26 by moving the inside of the housing 26 toward the proximal end side. The pressing operation of the operation button 28 (state shown in FIG. 7) and the movement of the inner needle hub 24 toward the proximal end side (state shown in FIG. 8) occur substantially at the same time. It is explained separately. Further, in this manner, the operation button 28 is pushed down to house the inner needle 22 in the housing 26. The needle tip 20 of the inner needle 22 is pulled out of the patient's blood vessel and positioned at the middle portion in the longitudinal direction of the outer needle 16. However, it may be performed in a state where the inner needle 22 is pierced into the blood vessel of the patient, or may be performed after the inner needle 22 is pulled out from the outer needle unit 12. Good.

  The inner needle 22 is removed from the outer needle unit 12 in this way, so that the outer needle unit 12 is placed on the patient's skin. By connecting an external flow path such as a syringe to the outer needle hub 18 in such a state from the proximal end side opening 38, the slit 56 of the hemostasis valve 50 is pushed open, and infusion, blood collection, and hemodialysis are performed. Done.

  In the indwelling needle assembly 10 configured as described above, the operation button 28 cannot be pressed by the lock portion before puncturing and before the operation of pushing the outer needle hub 18 forward in the puncturing direction. Therefore, for example, a problem that the inner needle 22 is accommodated in the housing 26 due to unintentional contact with the operation button 28 before puncturing can be avoided. In particular, the lock portion is unlocked by an operation generally performed when the indwelling needle assembly is punctured to push the outer needle hub 18 forward in the puncturing direction (the operation button 28 can be pressed). The operability can be improved without performing a special operation when unlocking the lock portion.

  In the present embodiment, the lock protrusions 118 provided on the operation button 28 are inserted into the lock grooves 42 provided on the outer needle hub 18, so that the circumferential direction between the outer needle hub 18 and the operation button 28 is increased. Relative rotation is prevented. This prevents the outer needle hub 18 from rotating in the circumferential direction when the outer needle 16 is fed to the distal end side, and the operating force exerted on the outer needle hub 18 in the rotational direction of the outer needle hub 18. Therefore, the outer needle 16 can be efficiently sent to the distal end side.

  In particular, in the present embodiment, the feeding operation portion that exerts an operating force for feeding the outer needle 16 to the distal end side is configured by the outer needle hub 18 that is directly fixed to the proximal end side of the outer needle 16. The outer needle 16 is sent out to the distal end side with good operating force transmission efficiency.

  Furthermore, in the present embodiment, since the support mechanism is provided and the outer needle hub 18 is sent to the distal end side in a state of being positioned substantially coaxially with respect to the housing 26, the transmission efficiency of the operating force is further improved. The outer needle 16 is fed to the distal end side.

  Further, since the outer needle hub 18 and the operation button 28 are mutually positioned in the circumferential direction, the outer needle hub 18 is intended with the operation button 28 facing upward when the indwelling needle assembly 10 is used. It is possible to prevent the rotation without rotating. Thereby, for example, the operation piece 46 for feeding the outer needle hub 18 forward in the puncture direction can be more reliably positioned upward, and the operability can be further improved. Further, by providing the operation piece 46, the possibility of contacting the proximal end opening 38 of the outer needle hub 18 when pushing the outer needle hub 18 forward in the puncturing direction is reduced, and the proximal end opening 38 is reduced. When connecting an external flow path such as a syringe to the patient, the risk of contamination of bacteria or the like into the patient's body can be reduced.

  Furthermore, in the present embodiment, not only the operation button 28 and the operation piece 46 but also the lock portion is exposed on the outer peripheral surface and positioned above when the indwelling needle assembly 10 is used. It is possible to easily grasp whether or not the pressing operation is possible.

  Further, in the present embodiment, the lock projection is formed by inserting the lock protrusion 118 provided on the operation button 28 into the lock groove 42 provided on the outer needle hub 18 so that the operation button 28 can be pressed. While being prevented, the positioning effect in the circumferential direction is exhibited. That is, since the lock portion is also configured as a circumferential positioning mechanism, for example, the structure can be simplified as compared with a case where a circumferential positioning mechanism is separately provided.

  Furthermore, in this embodiment, the lock portion is exposed on the outer peripheral surface of the indwelling needle assembly 10. Thereby, for example, the space inside the outer needle hub 18 can be advantageously ensured, and the disposition of the hemostasis valve mechanism 48 can be more reliably realized.

  In the present embodiment, in the initial state, the distal end portion of the inner needle hub 24 (small diameter portion 66) serves as the insertion portion 124, and enters the inside from the proximal end side opening 38 of the outer needle hub 18. As a result, the peripheral wall portion 32 of the outer needle hub 18 can be sandwiched radially inward and outward by the lock protrusion 118 (contact portion 120) of the operation button 28 and the insertion portion 124. Therefore, for example, even when an external force in the bending direction is applied to the indwelling needle assembly 10, the inner needle hub 24 can be effectively prevented from coming out of the outer needle hub 18.

  Next, FIGS. 9 and 10 show an indwelling needle assembly 130 as a second embodiment of the present invention in an initial state. In the present embodiment, a slider 136 is provided between the outer needle hub 132 and the housing 134 in the axial direction, and after the indwelling needle assembly 130 is punctured, the slider 136 is sent forward in the puncturing direction. Thus, the outer needle 16 and the outer needle hub 132 are fed forward in the puncturing direction. That is, in this embodiment, the slider 136 constitutes a sending operation unit to which an operating force for feeding the outer needle 16 to the distal end side is exerted. Note that members and parts that are substantially the same as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment in the drawings, and detailed description thereof is omitted.

  The outer needle hub 132 of this embodiment is the same as that of the first embodiment except that the lock groove (42) is not provided above the flange portion 40 provided in the proximal end opening 38. Since the structure is substantially the same as that of 18), detailed description thereof is omitted.

  On the other hand, the housing main body 138 in the housing 134 of the present embodiment includes a cylindrical peripheral wall portion 86 that extends substantially straight as a whole, and an inner diameter dimension is reduced at the distal end side opening portion 88 of the peripheral wall portion 86. . And the fitting cylinder part 140 protrudes toward the front end side from the inner peripheral edge part of this front end side opening part 88. FIG. A fitting groove 94 that extends in the axial direction and communicates with the insertion hole 90 is formed above the outer peripheral surface 27 of the distal end side opening 88 of the peripheral wall portion 86.

  The fitting cylinder part 140 has a cylindrical shape extending substantially straight, and has an outer diameter dimension and an inner diameter dimension smaller than those of the peripheral wall part 86. An annular tip wall 142 projecting toward the inner periphery is provided at the tip of the fitting tube 140, and from the inner peripheral edge of the tip wall 142 toward the tip. The insertion cylinder part 144 protrudes. That is, the housing main body 138 of the present embodiment is configured to include a peripheral wall portion 86, a fitting tube portion 140, and an insertion tube portion 144 each having a substantially cylindrical shape, and the outer diameter gradually increases toward the distal end side. It has a substantially stepped cylindrical shape with reduced dimensions and inner diameter. The distal end portion of the insertion tube portion 144 has a tapered shape that gradually decreases in diameter toward the distal end side, corresponding to the proximal end side opening 38 of the outer needle hub 18.

  In addition, an operation button 146 as shown in FIGS. 11 and 12 is assembled to the housing 134 of the present embodiment. That is, the operation button 146 of the present embodiment is not provided with the locking protrusion (118) as in the first embodiment, but instead is positioned above the inner hole 114 so as to open to the inner peripheral side. A lock groove 148 is provided as a recess. The lock groove 148 has a substantially rectangular cross-sectional shape, and is formed over the entire length of the annular portion 112 in the thickness direction (axial direction). That is, the lock groove 148 is opened on the distal end surface and the proximal end surface of the annular portion 112. Further, the width dimension of the lock groove 148 is substantially equal to the width dimension of the fitting groove 94 provided in the housing body 138. In the initial state shown in FIGS. By being inserted into the insertion hole 90 of the housing main body 138, the fitting groove 94 and the lock groove 148 communicate with each other in the axial direction.

  Here, the slider 136 includes a cylindrical wall portion 150 having a substantially cylindrical shape as a whole, and has a predetermined axial dimension. An annular contact wall 154 that protrudes to the inner peripheral side is formed at the distal end side opening 152 of the cylindrical wall 150. The inner diameter dimensions of the cylindrical wall portion 150 and the abutting wall portion 154 are substantially equal to or slightly larger than the outer diameter dimensions of the fitting cylindrical portion 140 and the insertion cylindrical portion 144 in the housing main body 138, respectively. In particular, the inner diameter dimension of the contact wall portion 154 is substantially equal to the inner diameter dimension of the proximal end side opening 38 of the outer needle hub 132.

  Further, on the outer peripheral surface 156 of the front end side opening 152 of the slider 136, an operation piece 158 is provided as a projecting projecting piece projecting outward (upward) on a part of the periphery (upward in FIG. 10). It has been. In the present embodiment, the operation piece 158 has a substantially trapezoidal plate shape, and protrudes upward with a larger protruding dimension than the operation piece 46 provided on the outer needle hub 132.

  Furthermore, a positioning projection 160 that protrudes from the tip of the cylindrical wall 150 to the tip side is formed on the tip side opening 152 of the slider 136 on the side opposite to the side where the operation piece 158 is provided (downward). ing.

  On the other hand, in the proximal end side opening 162 of the slider 136, a locking protrusion as a positioning convex portion protruding from the proximal end of the cylindrical wall portion 150 to the proximal end side is located at the same position (upward) as the operation piece 158. 164 is formed. The lock protrusion 164 has a shape having a substantially rectangular cross section, and the width of the lock protrusion 164 is such that the fitting groove 94 provided in the housing body 138 and the lock groove provided in the operation button 146. It is substantially equal to or slightly smaller than the width dimension of 148.

  The inner needle unit 166 of the present embodiment is configured including the housing 134, the operation button 146, the slider 136, the inner needle 22 and the inner needle hub 24 having the above-described structure. In other words, the annular portion 112 of the operation button 146 is inserted into the insertion hole 90 of the housing body 138 so that the operation button 146 is assembled to the housing body 138, and from the proximal end side opening (78) of the housing body 138. The inner needle 22 and the inner needle hub 24 are inserted, and the proximal end opening (78) is closed with the cap 80, whereby the inner needle 22 and the inner needle hub 24 are accommodated in the housing 134.

  In the initial state shown in FIGS. 9 and 10, the inner needle 22 and the inner needle hub 24 extend to the distal end side through the inner hole 114 of the operation button 146, that is, the distal end surface of the inner needle hub 24 (the distal end of the small diameter portion 66). Surface) is in contact with the proximal end surface of the distal end wall portion 142 provided at the distal end portion of the housing body 138, and the annular portion 112 of the operation button 146 is formed in the engagement recess 74 that opens below the inner needle hub 24. The engaging projection 116 protruding from the lower side to the inner peripheral side (upward) is inserted and engaged. In such an assembled state, the urging member is disposed between the flange-like portion 72 of the inner needle hub 24 and the inner protrusions 106, 106, 106, 106 protruding toward the inner peripheral side of the housing 134. The coil spring 122 is in a compressed state, and the inner needle hub 24 is biased toward the proximal end side with respect to the housing 134 based on the elastic restoring deformation of the coil spring 122. And the engagement convex part 116 engages with the engagement recessed part 74, The movement to the base end side of the inner needle hub 24 according to urging | biasing force is blocked | prevented.

  The slider 136 is assembled to the front end portion of the housing 134 as described above. In other words, the cylindrical wall portion 150 of the slider 136 is overlapped with the fitting cylindrical portion 140 of the housing main body 138 and extrapolated, and the abutting wall portion 154 of the slider 136 abuts on the distal end surface of the distal end wall portion 142. It is superposed on the insertion cylinder part 144 and extrapolated. In other words, the slider 136 is superimposed on the distal end portion of the housing main body 138 and extrapolated, and the insertion tube portion 144 of the housing main body 138 protrudes from the distal end side opening 152 of the slider 136. Thus, the central axis of the housing 134 and the central axis of the slider 136 are aligned with each other and supported substantially coaxially. That is, a support mechanism that positions and supports the slider 136 substantially coaxially with respect to the housing 134 is placed on the distal end portion of the housing main body 138 so that the slider 136 is overlapped and extrapolated (a fitting tube portion of the tube wall portion 150). 140 and extrapolation to the insertion cylinder part 144 of the contact wall part 154). The slider 136 is movable in the axial direction while being positioned substantially coaxially with respect to the housing 134 by the support mechanism.

  Here, a lock protrusion 164 protruding from the slider 136 toward the base end side is inserted into a fitting groove 94 provided in the housing body 138 and a lock groove 148 provided in the operation button 146. That is, the lock protrusion 164 is inserted from the inner peripheral side into the lock groove 148 that opens to the inner peripheral side. Then, the upper surface of the lock groove 148 and the upper surface of the lock protrusion 164 abut each other in the direction perpendicular to the axis of the housing 134, that is, the vertical direction, so that the operation button 146 cannot be moved downward (pressed down). Yes. Therefore, in the present embodiment, the lock protrusion 164 is inserted into the lock groove 148 from the inner peripheral side, thereby configuring a lock portion that disables the pressing operation of the operation button 146.

  Similarly to the first embodiment, the annular portion 112 of the operation button 146 is inserted into the insertion hole 90 of the housing main body 138 and / or in the arrangement region 98 provided on the outer peripheral surface 27 of the housing 134. By disposing the base portion 108 of the operation button 146, the housing 134 and the operation button 146 are mutually unrotatable in the circumferential direction. In addition, in the annular portion 112 of the operation button 146, the lock protrusions 164 abut in the circumferential direction against both side portions 148a and 148a in the width direction across the lock groove 148, so that the operation button 146 and the slider 136 are in the circumferential direction. Relative rotation is prevented (the operation button 146 and the slider 136 are positioned relative to each other in the circumferential direction). Further, the circumferential side portions 94a and 94a sandwiching the fitting groove 94 in the distal end side opening 88 of the peripheral wall portion 86 and the lock protrusion 164 contact each other in the circumferential direction, whereby the slider 136 and the housing 134 are brought into contact with each other. Circumferential relative rotation is prevented. Similarly to the first embodiment, the inner needle 22 and the inner needle hub 24 are not rotatable in the circumferential direction with respect to the housing 134. For these reasons, in this embodiment, each member (inner needle 22, inner needle hub 24, housing 134, slider 136, operation button 146) constituting the inner needle unit 166 is not rotatable relative to each other.

  In other words, in the present embodiment, one of the positioning mechanisms for positioning the slider 136 in the circumferential direction with respect to the housing 134 includes the lock projecting piece 164 and the lock groove 148. Further, since the housing 134 and the operation button 146 cannot be rotated relative to each other in the circumferential direction, the slider 136 can be moved relative to the operation button 146 by inserting the lock protrusion 164 into the fitting groove 94. Positioned in the circumferential direction via 134. Therefore, in the present embodiment, another positioning mechanism for positioning the slider 136 in the circumferential direction with respect to the housing 134 includes a circumferential relative rotation prevention mechanism for the housing 134 and the operation button 146, a lock protrusion 164, and a fitting groove. 94.

  The indwelling needle assembly 130 of this embodiment is configured by assembling the outer needle unit 168 with respect to the inner needle unit 166. That is, the inner needle 22 is inserted from the proximal end side opening 38 of the outer needle hub 132, passes through the hemostasis valve mechanism 48 and the outer needle 16, and the needle tip 20 of the inner needle 22 protrudes from the outer needle 16. . In addition, the distal end side opening 152 of the slider 136 is continuous with the proximal end side opening 38 of the outer needle hub 132 in the axial direction, and the housing main body 138 that protrudes from the distal end side opening 152 of the slider 136 to the distal end side is inserted. The cylindrical portion 144 is inserted into the outer needle hub 132 through the proximal end side opening 38 of the outer needle hub 132.

  In the present embodiment, since the distal end portion of the insertion tube portion 144 has a tapered shape corresponding to the proximal end side opening 38 of the outer needle hub 132, the outer peripheral surface of the insertion tube portion 144 and the outer needle hub 132. The inner circumferential surface 34 is in contact with the inner circumferential surface 34 with almost no gap. In particular, the insertion tube portion 144 is inserted into the proximal end side opening 38 of the outer needle hub 132 with a certain degree of fitting force, thereby preventing the outer needle unit 168 from unintentionally falling off from the inner needle unit 166. Is also possible.

Further, a positioning protrusion 160 that protrudes from the lower side of the slider 136 toward the distal end side is inserted into the positioning concave groove 44 provided below the flange portion 40 of the outer needle hub 132. In other words, in the proximal end side opening 38 of the outer needle hub 132, the peripheral wall portion 32 of the outer needle hub 132 is sandwiched between the insertion tube portion 144 of the housing body 138 and the positioning projection 160 of the slider 136 from the inside and outside in the radial direction. ing. This prevents relative rotation in the circumferential direction between the slider 136 and the outer needle hub 132, that is, the inner needle unit 166 and the outer needle unit 168. The relative rotation in the circumferential direction between the inner needle unit 166 and the outer needle unit 168 is prevented by, for example, the frictional force of contact between the inner peripheral surface 34 of the outer needle hub 132 and the outer peripheral surface of the insertion tube portion 144. It may be like this. Further, the slider 136 is provided with a protrusion having the same structure as the lock protrusion 118 in the first embodiment, and the outer needle hub 132 has a structure similar to the lock groove 42 in the first embodiment. A notch may be provided, and such a protrusion-notch engagement structure may be employed instead of or in combination with the positioning protrusion 160 and the positioning groove 44, Thereby, relative rotation in the circumferential direction between the slider 136 and the outer needle hub 132 may be prevented.

  The indwelling needle assembly 130 structured as described above is punctured with the inner needle 22 and the outer needle 16 inserted and removed as shown in FIGS. 9 and 10, and as shown in FIG. Then, the user's fingers are placed on the operation piece 158 of the slider 136, and the slider 136 is fed forward in the puncture direction. Thereby, the outer needle 16 and the outer needle hub 132 are sent out together with the slider 136 forward in the puncturing direction, and the outer needle 16 is pushed deeper into the patient's blood vessel.

  Note that the movement of the slider 136 forward in the puncture direction may be regulated by, for example, the following drop prevention mechanism. That is, the drop prevention mechanism is configured such that, for example, an unevenness is provided between the overlapping surfaces of the slider 136 and the housing main body 138, and the slider 136 moves forward by a predetermined distance from the housing main body 138 in the puncture direction. It can be configured by fitting the projections to each other. As a result, the amount of movement of the slider 136 forward in the puncturing direction is defined (the slider 136 can move to the tip side by a predetermined amount), and the slider 136 is effectively prevented from falling off the housing body 138. In addition, the delivery amount of the outer needle 16 to the distal end side can also be defined.

  Further, when the slider 136 is pushed forward in the puncturing direction in this manner, the lock protrusion 164 is detached from the lock groove 148, and the upper surface of the lock groove 148 provided on the operation button 146 and the slider 136 are provided. The contact with the upper surface of the lock protrusion 164 is released. Thereby, the downward movement (pressing operation) of the operation button 146 is permitted.

  Then, as shown in FIG. 14, by depressing the operation button 146, the engagement between the engagement convex portion 116 and the engagement concave portion 74 is released, and the inner needle hub 24 moves in the housing 134 according to the urging force. Move to the proximal side. Accordingly, the outer needle unit 168 is placed on the patient's skin, the needle tip 20 of the inner needle 22 is protected by the housing 134, and the inner needle unit 166 can be safely discarded.

  In the indwelling needle assembly 130 of the present embodiment having the above-described structure, the same effects as those of the first embodiment can be exhibited.

  In particular, in the present embodiment, a slider 136 is provided between the outer needle hub 132 and the housing 134 in the axial direction. The slider 136 has a predetermined axial dimension and the protruding amount of the operation piece 158 is small. Since it is relatively large, it is easy to perform an operation of placing a finger on the slider 136 and feeding it forward in the puncture direction. Further, since the operation button 146 and the slider 136 are positioned relative to each other in the circumferential direction, the operation piece 158 provided on the slider 136 can be stably directed upward, and the slider 136 can be moved forward in the puncture direction. The sending operation to can be realized more easily.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the specific descriptions in the embodiments, and various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art. It is feasible in the form which added.

  For example, in the first embodiment, the operation button 28 and the outer needle hub 18 are positioned in the circumferential direction by fitting the lock protrusion 118 (particularly the contact portion 120) into the lock groove 42 and positioning protrusion 100. However, any one of them may be used. That is, when the operation button 28 is provided so as not to rotate in the circumferential direction with respect to the housing 26, and the positioning protrusion 100 and the positioning groove 44 are provided, the outer needle hub 18 and the operation button 28 are interposed via the housing 26. Therefore, the lock protrusion 118 and the lock groove 42 need not exhibit the circumferential positioning effect. Alternatively, when the circumferential positioning effect is exhibited by the lock protrusion 118 and the lock groove 42, the positioning protrusion 100 and the positioning groove 44 may not be provided. In short, the lock portion (the lock protrusion 118 and the lock groove 42 in the first embodiment) does not need to have a circumferential positioning function. In the second embodiment, the outer needle unit 168 and the inner needle unit 166 are surrounded by fitting the positioning protrusion 160 into the positioning groove 44 and inserting the insertion tube portion 144 into the outer needle hub 132. Thus, the slider 136 and the outer needle hub 132 can be stably slid in the distal direction. However, it is not necessary to be configured in this way, and the outer needle unit 168 and the inner needle unit 166 may rotate relative to each other in the circumferential direction. That is, the positioning protrusion 160 and the positioning groove 44 are not essential, and the inner peripheral surface 34 of the outer needle hub 132 and the outer peripheral surface of the insertion tube portion 144 do not contact each other, and a gap is provided between them. May be.

  In the second embodiment, when the inner needle 22 and the inner needle hub 24 move to the proximal end side with respect to the housing 134, the needle tip 20 of the inner needle 22 is covered with the housing 134 and protected. However, the present invention is not limited to such a mode. That is, when the inner needle 22 moves to the proximal end side with respect to the housing 134, the needle tip 20 may protrude from the housing 134, and the slider in which the needle tip 20 has moved to the distal end side with respect to the housing 134. It may be covered and protected by 136. In the first and second embodiments, the needle tip 20 of the extracted inner needle 22 is protected by the housings 26, 134, and the inner needle units 14, 166 are safely discarded. However, the needle tip 20 of the inner needle 22 after being pulled out may protrude from the housings 26 and 134 or the slider 136.

  Furthermore, in the second embodiment, the operation pieces 46 and 158 are provided on both the outer needle hub 132 and the slider 136. However, when the operation piece 158 is provided on the slider 136, the operation is performed on the outer needle hub 132. The piece 46 need not be provided. In addition, by providing the operation pieces 46 and 158 on both the outer needle hub 132 and the slider 136 as in the second embodiment, the slider 136 is fed forward in the puncture direction using the operation piece 158. In addition, the outer needle hub 132 can be sent forward in the puncture direction using the operation piece 46. However, these operation pieces 46 and 158 are not essential in the present invention, and the outer needle surfaces 18 and 132 and the outer peripheral surfaces 36 and 156 of the slider 136 may be directly operated.

  Furthermore, in the first embodiment, as the support mechanism for positioning and supporting the outer needle hub 18 and the housing 26 substantially coaxially, the outer peripheral surface of the insertion portion 124 is the proximal end side opening portion of the outer needle hub 18. Although the aspect which contact | abuts to the internal peripheral surface 34 in 38 without substantially clearance gap was illustrated, it is not limited to this aspect. That is, for example, the support mechanism may be configured by sandwiching the peripheral wall portion 32 of the outer needle hub 18 in the vertical direction between the contact portion 120 of the lock protrusion 118 and the positioning protrusion 100. Alternatively, the peripheral wall portion 32 of the outer needle hub 18 is sandwiched radially inward and outward by the insertion portion 124 that is the distal end portion of the inner needle hub 24 that enters the outer needle hub 18 and the contact portion 120 and / or the positioning projection 100. The support mechanism may be configured by sandwiching with. Alternatively, a concave / convex fitting portion is provided between the contact portion 120 and / or the positioning protrusion 100 and the outer peripheral surface 36 of the outer needle hub 18, or between the insertion portion 124 and the inner peripheral surface 34 of the outer needle hub 18. The support mechanism may be configured by providing a concave-convex fitting portion. In addition, as a support mechanism, 2 or more of the aspects illustrated above may be used in combination.

  In the above embodiment, the lock portion (the lock protrusion 118 and the lock groove 42 in the first embodiment, and the lock protrusion 164 and the lock groove 148 in the second embodiment) is the outer periphery of the indwelling needle assemblies 10 and 130. Although it is provided exposed on the surface, it may be provided inside the indwelling needle assembly 10, 130, that is, inside the outer needle hub 18, 132 or inside the slider 136. Further, the lock portion and the operation buttons 28 and 146 do not need to be provided at the same position (upward) on the circumference. It may be provided on the opposite side.

  Furthermore, in the first embodiment, the outer needle hub 18 is provided with the lock groove 42 (positioning recess) and the operation button 28 is provided with the lock protrusion 118 (positioning protrusion). A positioning recess is provided on the outer needle hub 18 and a positioning protrusion is provided on the outer needle hub 18 so as to project in the proximal direction. The movement may be prevented. Furthermore, in the second embodiment, the slider 136 is provided with the lock protrusion 164 (positioning convex portion) and the operation button 146 is provided with the lock groove 148 (positioning concave portion). The operation button 146 is provided with a positioning projection that protrudes toward the distal end side, and the positioning projections and depressions are fitted into the projections and are brought into contact with each other in the vertical direction to prevent the operation button 28 from moving in the pressing direction. It may come to be.

  In the above-described embodiment, the coil spring 122 is used as the urging unit. However, a member that uses magnetic force such as a magnet may be employed in addition to a member that uses elasticity such as rubber or a leaf spring.

10, 130: Indwelling needle assembly, 16: Outer needle, 18, 132: Outer needle hub, 22: Inner needle, 24: Inner needle hub, 26, 134: Housing, 27: Outer peripheral surface of housing, 28, 146: Operation button (operation member), 32: peripheral wall portion of outer needle hub, 36: outer peripheral surface of outer needle hub, 38: proximal end side opening portion of outer needle hub, 40: flange portion, 42, 148: lock groove (positioning) Recessed part, positioning mechanism, locking part), 44: positioning groove (positioning mechanism), 46, 158: operation piece (sending protrusion), 50: hemostasis valve, 94: fitting groove (positioning mechanism), 100, 160 : Positioning protrusion (positioning mechanism), 116: engaging convex part (engaging part), 118, 164: lock projecting piece (positioning convex part, positioning mechanism, locking part), 122: coil spring (biasing member), 124 : Insertion part, 136: Sula Da, 156: outer peripheral surface of the slider

Claims (8)

An inner needle is inserted through an outer needle that projects from the distal end side of the housing, and the inner needle is moved by an urging member by depressing an operating member that is exposed on the outer peripheral surface of the housing. An indwelling needle assembly housed in the housing,
In a delivery operation portion to which an operation force is exerted to send the outer needle from the housing to the distal end side, the movement of the operation member in the depressing direction is prevented, and the movement is prevented by the delivery operation portion sending out the outer needle. An indwelling needle assembly comprising: a lock portion to be released; and a positioning mechanism for positioning the delivery operation portion with respect to the operation member in a circumferential direction of the housing.   The indwelling needle assembly according to claim 1, wherein the delivery operation unit is configured by an outer needle hub provided on the proximal end side of the outer needle.   The indwelling needle assembly according to claim 1, wherein the delivery operation unit is configured by a slider disposed between an outer needle hub provided on a proximal end side of the outer needle and the housing. A support mechanism is provided that allows the feeding operation section to be coaxially positioned with respect to the housing while allowing feeding to the distal end side.
The indwelling needle assembly according to any one of claims 1 to 3, wherein the lock portion is configured by a contact structure in a direction perpendicular to the axis of the housing between the operation member and the delivery operation portion.   The indwelling needle assembly according to any one of claims 1 to 4, wherein the positioning mechanism is configured by a contact structure in the circumferential direction of the housing between the operation member and the delivery operation unit. One of the operation member and the sending operation portion is provided with a positioning recess that opens toward the other, and the other of the operation member and the sending operation portion is a positioning projection that protrudes toward the other. Is provided,
The positioning convex portion is inserted into the positioning concave portion, and the positioning convex portion is separated from the positioning concave portion by the feeding of the outer needle by the feeding operation portion. The indwelling needle assembly according to any one of claims 1 to 5, wherein the positioning mechanism is configured.   In the delivery operation portion, a delivery projecting piece capable of directly exerting an operation force for delivering the outer needle from the housing to the distal end side protrudes on the outer periphery at a position corresponding to the operation member of the housing in the circumferential direction. The indwelling needle assembly of any one of Claims 1-6 provided.   An inner needle hub provided on the proximal end side of the inner needle is urged to the proximal end side by the urging member and disposed in the housing, and on the distal end side in the pressing direction of the operation member. An engagement portion is provided that protrudes into the housing and engages with the inner needle hub to prevent the urging member from moving the inner needle hub. The indwelling needle assembly according to any one of claims 1 to 7, wherein an engagement portion moves outward of the housing to disengage the inner needle hub.

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