JP2011056010A - Indwelling needle assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indwelling needle assembly capable of retracting an inner needle with the urging force of urging means without requiring any special operation. <P>SOLUTION: The indwelling needle assembly 1 includes an outer needle member 2, an inner needle member 3, urging means locking member 4, an outer barrel tube member 5, an inner barrel tube member 6 and a finger hooking part 7. The urging means locking member 4 in which the urging means 19 is disposed is engaged with the inner needle member 3, and the inner needle member 3 is engaged with the outer barrel tube member 5. The inner barrel tube member 6, following puncture, is moved in the puncture direction, and the engagement between the inner needle member 3 and the outer barrel tube member 5 is released by the inner barrel tube member 6, so that the urging force of the urging means 19 is released. The urging means locking member 4 is retracted with the urging force of the urging means 19, and the inner needle member 3 is housed inside the inner barrel tube member 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an indwelling needle assembly including an indwelling needle that is punctured into a blood vessel or the like and used for connection with an infusion line or the like.

  2. Description of the Related Art Conventionally, an inner needle inserted into an outer needle is provided, and the inner needle is guided to puncture the outer needle, and then the inner needle is removed and an infusion line is connected to the placed outer needle. Such indwelling needles are known. However, in the conventional indwelling needle, when the inner needle is removed from the outer needle, the ejected patient's blood scatters and is applied to the doctor or nurse, or the removed inner needle is erroneously punctured to the doctor or nurse. There is a problem that there are things to do. At this time, if the patient is a patient with an infection such as HIV, doctors and nurses may be affected by scattered blood or erroneous puncture.

  Therefore, an indwelling needle assembly is known that includes the inner needle, a case in which the inner needle is provided so as to be freely inserted and removed, and a spring attached between the inner needle and the case (see, for example, Patent Document 1). ). In the indwelling needle assembly, when the inner needle protrudes from the case, the spring is locked by a stopper in a state in which the spring is biased in a direction in which the inner needle is housed in the case. Then, when the doctor or nurse releases the locking by the stopper, the inner needle is removed by the elastic force of the spring and stored in the case.

  According to the conventional indwelling needle assembly, by connecting an outer needle base to the case, it is possible to prevent the patient's blood from scattering when the inner needle is removed. Further, since the removed inner needle is housed in the case, it is possible to prevent a doctor or nurse from puncturing it.

JP 2004-49607 A

  However, the conventional indwelling needle assembly has a disadvantage that the inner needle cannot be retracted due to the elastic force of the spring unless the doctor or nurse releases the locking of the spring by the stopper.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an indwelling needle assembly that can eliminate such inconvenience and can retract an inner needle by a biasing force of a biasing means without performing a special operation.

  In order to achieve such an object, an indwelling needle assembly of the present invention includes an outer needle member including an outer needle body, an outer needle base provided at a proximal end portion of the outer needle body, and an inner portion of the outer needle body. An inner needle body to be inserted into the inner needle body and a proximal end portion of the inner needle body which is provided at the proximal end portion of the inner needle body and protrudes from the outer needle base when the inner needle body is inserted into the outer needle body. An inner needle base, a pair of engaging pins projecting laterally from the central portion of the inner needle base, and a pair of engaging projections projecting laterally from the proximal end portion of the inner needle base A needle member, a first cylindrical member into which a portion on the proximal end side from the engagement pin of the inner needle base is inserted, and a first cylinder connected to the proximal end side of the first cylindrical member A second cylindrical member having a larger diameter than the first member, and an inner peripheral surface of the step portion between the first cylindrical member and the second cylindrical member, and the engagement protrusion is engaged with the second cylindrical member. And a first cylindrical member The biasing means locking member that locks one end of the biasing means disposed on the outer peripheral surface with the outer peripheral surface of the stepped portion, and the first cylindrical member of the biasing means locking member are accommodated. A third cylindrical member in which the other end of the urging means is locked to the inner surface of the tip and the engaging pin is engaged to the outer surface of the tip. An outer cylindrical pipe member including a fourth cylindrical member connected to the outer peripheral side via a connecting member and containing the third cylindrical member; a third cylindrical member of the outer cylindrical pipe member; and a fourth cylindrical member A fifth cylindrical member that is movably fitted between the cylindrical member and a space that extends along a length direction on the side surface of the fifth cylindrical member and accommodates the engaging pin; The fifth cylindrical member is provided at the distal end portion of the fifth cylindrical member and has a smaller diameter than the fifth cylindrical member into which the outer needle base is externally fitted and a portion of the inner needle base from the engagement pin is inserted. First An inner cylindrical pipe member including the cylindrical member, and an outer cylindrical surface of the inner cylindrical pipe member, and a fifth cylindrical member is a third cylindrical member and a fourth cylinder of the outer cylindrical pipe member. And a finger hook portion positioned on the outer peripheral surface of the fourth cylindrical member when fitted between the outer needle body and the inner needle body. After guiding the main body and advancing a predetermined distance, the finger hooking portion is pressed in the puncture direction of the outer needle main body to advance the inner tubular member relative to the outer tubular member, The engagement pin is pressed to the distal end side at the base end portion of the space portion and broken and removed to release the engagement of the inner needle member with the outer cylinder member, and the urging force of the urging means The urging means locking member is moved backward by the urging means, and the inner needle main body is accommodated in the inner cylindrical tube member via the inner needle base engaged with the urging means locking member. To do.

  In the indwelling needle assembly of the present invention, the urging means is on the outer peripheral surface of the first cylindrical member of the urging means locking member, and the outer periphery of the step portion between the first cylindrical member and the second cylindrical member. It is arrange | positioned between the surface and the front-end | tip part inner surface side of the 3rd cylindrical member of the outer cylinder pipe member in which the 1st cylindrical member is inserted. Here, the biasing means locking member is biased in the proximal direction by the biasing means with the inner surface side of the distal end portion of the third cylindrical member of the outer cylindrical tube member as a fulcrum.

  However, the biasing means locking member is provided at the proximal end portion of the inner needle base by the engaging portion provided on the inner peripheral surface of the step portion between the first cylindrical member and the second cylindrical member. Engaged with the engaging protrusion. Further, the inner needle base is engaged with the outer surface side of the distal end portion of the third cylindrical member of the outer cylindrical tube member by an engagement pin provided at the center thereof. As a result, the urging means is engaged between the step portion between the first cylindrical member and the second cylindrical member and the inner surface side of the distal end portion of the third cylindrical member of the outer tube member. It has been stopped.

  In the indwelling needle assembly of the present invention, with the urging means locked as described above, first, the inner needle body is guided to puncture the outer needle body into the blood vessel. Then, after guiding the outer needle main body by the inner needle main body and moving it forward a predetermined distance, the finger hooking portion is pressed with a finger in the puncturing direction of the outer needle main body, and the inner cylindrical tube member is removed from the outer needle main body. Advance relative to the tube member.

  At this time, the engaging pin engages with the outer surface side of the distal end portion of the third cylindrical member of the outer cylindrical tube member, and the distal end portion is accommodated in a space portion provided on the side surface of the inner cylindrical tube member. Has been. Therefore, as described above, when the inner tube member is advanced relative to the outer tube member, the base end portion of the space portion comes into contact with the engagement pin, and the engagement pin is It is removed by pressing in the direction of the tip and breaking.

  In this case, the engagement between the inner needle base and the third cylindrical member of the outer cylindrical tube member is released, so that the latching state of the urging means is also released, and the urging means Due to the urging force, the urging means locking member moves in the fourth cylindrical portion to the base end side. On the other hand, since the inner needle base is maintained in a state of being engaged with the biasing means locking member by the engaging projection, the inner needle base is also moved with the retraction of the biasing means locking member. The inner needle body is retracted and is accommodated in the inner tube member.

  Therefore, according to the indwelling needle assembly of the present invention, the outer needle main body is punctured into the blood vessel, the outer needle main body is guided by the inner needle main body and moved forward by a predetermined distance, and then the finger hooking portion is left as it is. The inner needle body can be retracted by the urging force of the urging means and accommodated in the inner tube member without performing any special operation.

  Further, according to the indwelling needle assembly of the present invention, since the outer needle base is externally fitted to the sixth cylindrical member of the inner cylindrical member into which the tip portion side portion of the inner needle base is inserted, When the inner needle main body is accommodated in the inner tube member, it is possible to prevent the patient's blood from being scattered outside.

  Furthermore, according to the indwelling needle assembly of the present invention, since the inner tube member is accommodated in the outer tube member before use, the overall length can be shortened.

  Further, in the indwelling needle assembly of the present invention, the outer tube member accommodates the urging means locking member that moves backward by the urging force of the urging means, and moves backward together with the urging means locking member. A bottomed cylindrical body is provided at the base end portion.

  The indwelling needle assembly according to the present invention includes the bottomed cylindrical body at the base end portion of the outer cylindrical tube member, and thereby accommodates the biasing means locking member that retreats by the biasing force of the biasing means. Thus, the biasing means locking member and the inner needle member can be prevented from projecting to the outside of the outer tube member. Further, according to the indwelling needle assembly of the present invention, since the bottomed tubular body is accommodated in the outer tubular tube member before use, the overall length can be further shortened.

  In addition, when the indwelling needle assembly of the present invention includes the bottomed cylindrical body, the outer tube member includes a pair of holes in the base end portion, and the bottomed cylindrical body has a distal end portion. Protruding portions projecting laterally from the outer peripheral surface are provided, and the projecting portions engage with the hole portions to prevent the bottomed cylindrical body from coming off when the bottomed cylindrical body is retracted.

  In the indwelling needle assembly according to the present invention, the protruding portion of the bottomed cylindrical body is engaged with the hole portion of the outer tube member to prevent it from coming off, so that the attaching portion is retracted by the urging force of the urging means. It is possible to reliably prevent the biasing means locking member and the inner needle member from protruding outside the outer tube member.

  In the indwelling needle assembly of the present invention, the outer tube member includes a hook-like member that protrudes in the length direction from the distal end surface of the fourth cylindrical member, and the hook-like member includes the inner cylinder. When the tube member moves forward relative to the outer tube member, the inner needle main body accommodated in the outer tube member is re-projected by being locked to the base end portion of the finger hook portion. It is characterized by blocking.

  In the indwelling needle assembly according to the present invention, the outer cylindrical tube member includes the flange-shaped member on a distal end surface of the fourth cylindrical member, so that the inner cylindrical tube member is opposed to the outer cylindrical tube member. When relatively advanced, the hook-like member is locked to the base end portion of the finger hook portion. As a result, the inner cylindrical tube member cannot be retracted due to the finger hook portion interfering with the hook-shaped portion, and re-projection of the inner needle main body accommodated in the outer cylindrical tube member is prevented.

  Therefore, when the outer tube member is provided with the hook-shaped member on the distal end surface of the fourth cylindrical member, erroneous puncture of the used inner needle main body can be prevented.

  In the indwelling needle assembly of the present invention, the biasing means locking member includes a diffuser means that allows only gas to pass and suppresses passage of liquid at a base end portion of the second cylindrical member. It is characterized by.

  In the indwelling needle assembly of the present invention, the air diffuser only allows gas air to pass through even if a flashback of blood occurs when the inner needle main body is punctured into a blood vessel, and is blood that is liquid. Suppresses the passage of Therefore, it is possible to reduce the scattering of blood to the outside of the air diffuser.

  Further, in the indwelling needle assembly of the present invention, the engagement pin is brought into contact with the outer surface side of the distal end portion of the third cylindrical member, and when the inner needle body is hit, the third cylinder It is pressed to the distal end side by the outer surface side of the distal end portion of the shaped member, broken and removed.

  When the inner needle body is hit, the engagement pin is pressed toward the distal end side by the outer surface side of the distal end portion of the third cylindrical member, and is broken and removed. When the engagement pin is removed, as described above, the biasing means locking member is moved to the proximal end side by the biasing force of the biasing means, and the inner needle main body is moved into the inner tube member. Be contained. Therefore, the inner needle main body cannot be physically used for puncturing, and it is possible to prevent the inner needle main body whose blade edge is crushed or contaminated by the impact from being used for puncturing.

Explanatory sectional drawing which shows the structure of the indwelling needle assembly of this invention. II-II sectional view taken on the line of FIG. Explanatory sectional drawing which shows the assembly method of an inner needle member and an inner cylinder pipe member. Explanatory top view which shows the assembly method of an inner needle member and an inner cylinder pipe member. Explanatory sectional drawing which shows the assembly method of an inner cylinder pipe member and an outer cylinder pipe member. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. Explanatory sectional drawing which shows the assembly method of an outer cylinder pipe member, a spring, and a spring stop member. VIII-VIII sectional view taken on the line of FIG. Explanatory sectional drawing which shows the assembly method of an outer needle member and an inner needle main body. Explanatory sectional drawing which shows the assembly method of an outer needle member and an inner needle main body, and an inner cylinder pipe member. Explanatory sectional drawing which shows the state of the assembled indwelling needle assembly. XII-XII sectional view taken on the line of FIG. Explanatory sectional drawing which shows the state which prepares use of the indwelling needle assembly of this invention. Explanatory sectional drawing which shows the state which uses the indwelling needle assembly of this invention. The top view which shows the 1st holding | grip method of the indwelling needle assembly of this invention. The top view which shows the 2nd holding | grip method of the indwelling needle assembly of this invention. Explanatory sectional drawing which shows the usage method of the indwelling needle assembly of this invention. XVIII-XVIII sectional view taken on the line of FIG. Explanatory sectional drawing which expands and shows the A section of FIG. Explanatory sectional drawing which shows the state by which engagement of the inner needle base was cancelled | released. Explanatory sectional drawing which shows the state which prevents the re-projection of an inner needle main body.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the indwelling needle assembly 1 of the present embodiment includes an outer needle member 2, an inner needle member 3, and an urging means mechanism that locks an end of a spring that is an urging means. A spring stop member 4 as a stop member, an outer tube member 5, an inner tube member 6, and a finger hook 7 are provided.

  The outer needle member 2 includes an outer needle main body 9 having a shaved bamboo-shaped puncture portion 8 at a distal end portion and an outer needle base 10 provided at a proximal end portion of the outer needle main body 9. In the present specification, along the length direction of the indwelling needle assembly 1, the puncture portion 8 direction is referred to as a distal end portion, and the opposite side to the puncture portion 8 is referred to as a proximal end portion.

  The inner needle member 3 includes an inner needle body 11 inserted into the outer needle body 9 and an inner needle base 12 provided at a proximal end portion of the inner needle body 11. The inner needle base 12 has a pair of engaging pins 13 and 13 projecting sideways from the central portion and a pair of engaging projections 14 and 14 projecting sideways from the proximal end of the inner needle base 12. And. For example, the engaging pins 13, 13 project obliquely from the side of the central portion of the inner needle base 12 toward the proximal end side, but project at right angles from the central portion of the inner needle base 12 to the side. It may be.

  The spring retaining member 4 includes a first cylindrical member 15 into which a portion on the proximal end side from the engagement pins 13 and 13 of the inner needle base 12 is inserted, and a proximal end portion side of the first cylindrical member 15. A second cylindrical member 16 that is connected and has a larger diameter than the first cylindrical member 15 is provided. Further, an engagement portion with which the engagement protrusions 14 of the inner needle base 12 are engaged with the inner peripheral surface of the step portion 17 between the first cylindrical member 15 and the second cylindrical member 16. 18 is provided.

  A spring 19 as an urging means is arranged on the outer peripheral surface of the first cylindrical member 15 of the spring stopper member 4, and one end of the spring 19 is the outer peripheral surface of the stepped portion 17. It is locked with. Further, the proximal end side of the second cylindrical member 16 of the spring stopper member 4 is closed by an air diffuser plug 20 as an air diffuser that allows only gas to pass and suppresses the passage of liquid. Note that the air diffuser may have any function that allows only gas to pass and suppresses the passage of liquid, and instead of the air diffuser 20, for example, a cylindrical body having a small-diameter through-hole is used. It may be.

  The outer tube member 5 is connected to the third cylindrical member 21 in which the first cylindrical member 15 of the spring retaining member 4 is accommodated, and the outer peripheral side of the third cylindrical member 21 via the connection member 22. And a fourth cylindrical member 23 that accommodates the third cylindrical member 21. In the third cylindrical member 21, the other end of the spring 19 is locked to the inner surface of the tip, and the engagement pins 13 and 13 of the inner needle base 12 are engaged to the outer surface of the tip. It is like that. For this reason, the third cylindrical member 21 is provided with a pair of slits 24 and 24 through which the engagement pins 13 and 13 can be inserted on the side surface of the tip.

  In the outer tube member 5, the fourth cylindrical member 23 is formed longer than the third cylindrical member 21, and a bottomed tube is formed on the inner peripheral side of the base end portion of the fourth cylindrical member 23. A shaped body 25 is fitted. The bottomed cylindrical body 25 accommodates the spring stopper member 4 and retracts together with the spring stopper member 4 when the spring stopper member 4 is retracted by the elastic force of the spring 19. In addition, the bottomed cylindrical body 25 has a pair of protrusions 26 and 26 that protrude laterally from the outer peripheral surface of the distal end portion in order to prevent the bottomed cylindrical body 25 from falling off the fourth cylindrical member 23 during the retreat. It has. The protrusions 26, 26 are engaged with a pair of holes 27, 27 provided at the base end of the fourth cylindrical member 23, thereby preventing the bottomed tubular body 25 from coming off.

  The outer tube member 5 includes a flange-like member 28 that protrudes in the length direction from the distal end surface of the fourth cylindrical member 23.

  The inner cylindrical tube member 6 includes a fifth cylindrical member 29 that is movably fitted between the third cylindrical member 21 and the fourth cylindrical member 23 of the outer cylindrical tube member 5, and a fifth cylindrical member 29. And a sixth cylindrical member 30 having a diameter smaller than that of the fifth cylindrical member 29. In the sixth cylindrical member 30, the outer needle base 10 is externally fitted, and the distal end side portion is inserted from the engagement pins 13, 13 of the inner needle base 12 on the inner peripheral side.

  In addition, on the upper surface of the fifth cylindrical member 29, when inserted between the third cylindrical member 21 and the fourth cylindrical member 23, the interference with the connection member 22 is avoided. A slit 31 is provided. Further, a pair of elongated holes 32 serving as a space portion that extends along the length direction and accommodates the engagement pins 13 and 13 of the inner needle base 12 is formed on the inner side surface of the fifth cylindrical member 29. , 32 are provided.

  The finger hook portion 7 is connected to the outer peripheral surface of the inner tube member 6, more specifically, the upper surface of the fifth cylindrical member 29 via a pair of bridging portions 33. As a result, the finger hook portion 7 has the fifth cylindrical member 29 of the inner cylindrical tube member 6 fitted between the third cylindrical member 21 and the fourth cylindrical member 23 of the outer cylindrical tube member 5. When combined, they are positioned on the outer peripheral surface of the fourth cylindrical member 23.

  Further, the indwelling needle assembly 1 of the present embodiment includes a bottomed cylindrical protector 34 that accommodates and protects the outer needle member 2, and the protector 34 has a proximal end portion of the outer tube member 5. Four cylindrical members 23 are detachably fitted to the outer peripheral surface.

  Next, a method for assembling the indwelling needle assembly 1 of the present embodiment will be described.

  When the indwelling needle assembly 1 is assembled, the inner needle base 12 is first assembled to the inner tube member 6 as shown in FIGS. Here, the inner tube member 6 has a configuration in which an upper half 6a and a lower half 6b that are divided by a line that bisects the long holes 32 and 32 are connected by a hinge 6c.

  Therefore, next, in a state where the inner tube member 6 is divided into the upper half 6a and the lower half 6b, for example, the engagement pins 13 and 13 are accommodated in the elongated holes 32 and 32 of the upper half 6a. The inner needle base 12 is arranged so as to be Then, the inner needle base 12 is assembled in a state where the engagement pins 13 and 13 are accommodated in the elongated holes 32 and 32 by bending the lower half 6b with the hinge 6c and connecting it to the upper half 6a. The inner tube member 6 can be obtained. The connection between the upper half 6a and the lower half 6b can be performed, for example, by fitting the upper half 6a and the lower half 6b to each other.

  Next, as shown in FIGS. 5 and 6, the inner tube member 6 is assembled to the outer tube member 5. The inner tube member 6 is assembled to the outer tube member 5 by inserting the proximal end portion side of the inner tube member 6 from the distal end side of the outer tube member 5. More specifically, the fifth of the inner tube member 6 is between the third cylindrical member 21 and the fourth cylindrical member 23 of the outer tube member 5 from the distal end side of the outer tube member 5. The cylindrical member 29 is inserted from the base end side.

  At this time, the third cylindrical member 21 is connected to the fourth cylindrical member 23 via the connection member 22, but the fifth cylindrical member 29 includes a slit 31 on the upper surface side thereof. Therefore, by accommodating the connection member 22 in the slit 31, it is possible to avoid the fifth cylindrical member 29 from interfering with the connection member 22, and the fifth cylindrical shape with respect to the third cylindrical member 21. The member 29 can be positioned.

  Further, the engagement pins 13, 13 projecting laterally from the inner needle base 12 are inserted into slits 24, 24 provided on the side surfaces of the distal end portion of the third cylindrical member 21, whereby the third Interference with the cylindrical member 21 can be avoided. Then, the engagement pins 13 and 13 are brought into contact with the outer surface side of the distal end portion of the third cylindrical member 21.

  In addition, the finger hook portion 7 is connected to the upper surface of the fifth cylindrical member 29 via a pair of bridging portions 33, and the fourth cylindrical member 23 is formed on both side surfaces of the flange-shaped member 28. A slit portion (not shown) is provided on the extension. Therefore, when the fifth cylindrical member 29 is inserted between the third cylindrical member 21 and the fourth cylindrical member 23, the finger hook portion 7 moves the pair of bridging portions 33 to By being inserted into the slit portion, it can be positioned on the outer peripheral surface of the fourth cylindrical member 23.

  Next, as shown in FIGS. 7 and 8, the spring stopper member 4 is assembled to the outer tube member 5. The spring stopper member 4 is assembled to the outer tube member 5 by inserting the distal end portion of the spring stopper member 4 from the base end portion side of the outer tube member 5. More specifically, the first cylindrical member 15 of the spring stopper member 4 is inserted into the inner peripheral side of the third cylindrical member 21 of the outer cylindrical tube member 5, and the first cylindrical member 15 A portion on the proximal end side from the engagement pins 13 and 13 of the inner needle base 12 is inserted on the inner peripheral side.

  At this time, a spring 19 is disposed on the outer peripheral surface of the first cylindrical member 15. The spring 19 is a coil spring that generates an elastic force by being compressed, and is initially in an expanded state. One end of the spring 19 is locked to the outer peripheral surface of the stepped portion 17 between the first cylindrical portion 15 and the second cylindrical portion 16 of the spring stopper member 4, and the other end portion Is locked to the inner surface of the distal end portion of the third cylindrical member 21 of the outer tube member 5. Then, as the first cylindrical member 15 of the spring stopper member 4 is inserted into the inner peripheral side of the third cylindrical member 21 of the outer tube member 5, the spring 19 is compressed.

  At this time, the first cylindrical member 15 of the spring retaining member 4 is provided with a pair of grooves 35 and 35 extending from one end to the other end along the length direction on the inner surface. Yes. Then, when the proximal end portion side of the inner needle base 12 is inserted into the inner peripheral side of the first cylindrical member 15 of the spring stopper member 4, the engagement protrudes laterally from the proximal end portion of the inner needle base 12. The protrusions 14 and 14 are inserted through the groove portions 35 and 35. When the engagement protrusions 14, 14 of the inner needle base 12 pass through the inner peripheral side of the first cylindrical member 15 and reach the inner peripheral side of the second cylindrical member 16, the spring stopper member 4 is moved. By being rotated by 90 °, it is engaged with an engaging portion 18 provided on the inner peripheral surface of the stepped portion 17.

  In this state, the spring 19 is compressed, and an elastic force that urges the spring stopper 4 toward the base end side acts on the inner surface side of the tip end portion of the third cylindrical member 21 as a fulcrum. However, the spring retaining member 4 is engaged with the inner needle base 12 via the engagement protrusions 14, 14, and the inner needle base 12 is connected to the tip of the third cylindrical member 21 via the engagement pins 13, 13. It is engaged with the part outer surface side. Therefore, in this state, the spring stopper 4 does not move to the base end side due to the elastic force of the spring 19.

  The configuration for engaging the spring stopper member 4 with the inner needle base 12 is not limited to the configuration for engaging the engaging protrusions 14 and 14 with the engaging portion 18, but other configurations. Also good. For example, a pair of elastic members that are biased toward the outer peripheral side may be provided at the proximal end portion of the inner needle base 12 instead of the engagement protrusions 14 and 14. In this case, the first cylindrical member 15 of the spring retaining member 4 does not include the groove portions 35, 35, and the elastic member is bent on the inner peripheral side to the inner peripheral surface of the first cylindrical member 15. It is inserted. When the elastic member reaches the inner peripheral side of the second cylindrical member 16, the elastic member expands to the outer peripheral side by the biasing force and engages with the inner peripheral surface of the stepped portion 17.

  Next, as shown in FIG. 9, the inner needle main body 11 is inserted into the outer needle member 2 from the outer needle base 10 side, and the blade jaw of the inner needle main body 11 and the tip of the outer needle main body 9 are aligned. Fix it. The alignment is performed in accordance with JIS T 3223 so that the distance between the blade jaw of the inner needle body 11 and the tip of the outer needle body 9 is 1 mm or less. Then, as shown in FIG. 10, the proximal end portion of the inner needle main body 11 is adhered to the inner needle base 12, and the outer needle base 10 is externally fitted to the sixth cylindrical member 30 of the inner tube member 6. The outer needle member 2 is attached.

  Next, as shown in FIGS. 11 and 12, the diffuser plug 20 is fitted and closed at the base end portion of the spring stopper member 4, and the bottomed cylindrical body is formed at the base end portion of the outer tube member 5. 25 is inserted. And the protector 34 which accommodates and protects the outer needle member 2 is fitted to the outer peripheral surface of the fourth cylindrical member 23 of the outer tube member 5 at the base end portion thereof, thereby assembling the indwelling needle assembly 1. To complete.

  Next, the usage method of the indwelling needle assembly 1 of this embodiment is demonstrated.

  When using the indwelling needle assembly 1 of this embodiment, first, as shown in FIG. 13, the protector 34 is removed from the outer tube member 5, and the outer needle member 2 is exposed. Then, it is confirmed that the outer needle base 10 is securely fitted to the sixth cylindrical member 30 of the inner tube member 6.

  At the same time, the presence or absence of sticking between the distal end portion of the outer needle main body 9 and the inner needle main body 11 is confirmed. The outer needle body 9 is a thin tube made of polytetrafluoroethane or polyurethane, and may be firmly attached to the inner needle body 11 by heat for sterilization or the like. Therefore, the presence or absence of the sticking is confirmed. If the sticking is strong, a process such as peeling is performed.

  Next, the outer needle body 11 inserted into the outer needle main body 9 and the outer needle main body 9 by holding the outer peripheral face of the outer cylindrical tube member 5, more specifically, the outer peripheral face of the fourth cylindrical member 23 with fingers. Puncture the blood vessel. FIG. 14 shows a state where the outer needle body 9 and the inner needle body 11 are punctured into a blood vessel. The puncture of the blood vessel in the outer needle body 9 and the inner needle body 11 is confirmed by the blood flashing back into the second cylindrical member 16 of the spring stopper member 4. Note that the proximal end portion of the second cylindrical member 16 is closed by the air diffuser 20, and the air diffuser 20 allows only air, which is a gas, to pass therethrough and suppresses the passage of blood, which is a liquid. Scattering of the backed blood to the outside of the second cylindrical member 16 is reduced.

  At this time, in order to grip the outer peripheral surface of the fourth cylindrical member 23 with fingers, for example, as shown in FIG. 15, the first finger (thumb) 36 and the third finger (middle finger) 37 form the fourth cylindrical shape. The outer peripheral surface of the member 23 is gripped, and the second finger (index finger) 38 is hung on the finger hook 7. Alternatively, as shown in FIG. 16, the fourth cylindrical member 23 is placed with the second finger 38 as a base, and the first finger 36 and the second finger are placed on the finger hook 7. 38, the outer peripheral surface of the fourth cylindrical member 23 may be clamped.

  If the outer needle main body 9 and the inner needle main body 11 have been punctured into the blood vessel, the outer needle main body 9 and the inner needle main body 11 are then laid down (the puncture angle with respect to the blood vessel is reduced) and further punctured into the blood vessel several mm. Next, after the outer needle main body 9 is guided by the inner needle main body 11 and advanced by a predetermined distance, the finger hooking portion 7 is pressed with the first finger 36 or the second finger 38 as shown in FIG. The tubular tube member 6 is moved relative to the outer tubular tube member 5 toward the distal end side.

  In this way, as shown in FIGS. 18 and 19, the base end portions of the long hole portions 32, 32 provided on the inner side surface of the fifth cylindrical member 29 of the inner tube member 6 are the outer tube. The tube member 5 abuts on the engagement pins 13, 13 engaged with the outer surface side of the distal end portion of the third cylindrical member 21. When the inner tube member 6 is further moved toward the distal end side relative to the outer tube member 5, the engagement pins 13 and 13 are pressed by the base end portions of the elongated holes 32 and 32. As shown by the phantom line in FIG. 19, it will be reversed to the tip side, broken and removed from the inner needle base 12.

  Here, the engaging pins 13 and 13 may be columnar bodies such as a quadrangular column, but may be flat plate bodies to facilitate the breakage. In addition, when the engagement pins 13 and 13 are columnar bodies such as quadrangular columns, a groove portion may be provided in a portion connected to the inner needle base 12 in order to facilitate the breakage.

  When the engagement pins 13, 13 are removed from the inner needle base 12, the engagement of the inner needle base 12 with the third cylindrical member 21 is released, so that the elastic force of the spring 19 is released. The elastic force biases the spring retaining member 4 toward the proximal end portion with the inner surface side of the distal end portion of the third cylindrical member 21 as a fulcrum. As a result, as shown in FIG. 20, the spring stopper 4 is elastically retracted by the elastic force of the spring 19 and is moved to the base end side.

  That is, according to the indwelling needle assembly 1 of the present embodiment, a special operation can be performed by simply pressing the finger hooking portion 7 toward the distal end portion by extending the operation of piercing the blood vessel with the outer needle body 9 and the inner needle body 11. The elastic force of the spring 19 can be activated without performing an operation.

  At this time, since the inner needle base 12 is engaged with the spring stopper member 4 by the engaging members 14, 14, the inner needle base 12 moves backward together with the spring stopper member 4 and is moved to the proximal end side. The attached inner needle body 11 is drawn into the inner tube member 6. When the inner needle main body 11 is pulled into the inner tube member 6, the outer needle main body 9 is placed in the blood vessel, so that blood spouts to the outer needle base 10 through the outer needle main body 9, but the outer needle The base 10 is still externally fitted to the sixth cylindrical body 30 and maintains a state where it is connected to the inner tube member 6. Therefore, it is possible to prevent blood spouted to the outer needle base 10 from being scattered outside.

  Further, the spring retaining member 4 moved to the base end side is accommodated in a bottomed cylindrical member 25 fitted on the inner peripheral surface of the fourth cylindrical member 23. The bottomed cylindrical member 25 can attenuate the urging force of the spring 19 by sliding along the inner peripheral surface of the fourth cylindrical member 23 in a state where the spring stopper member 4 is accommodated. Furthermore, the bottomed cylindrical member 25 includes a pair of protrusions 26 and 26 protruding laterally from the outer peripheral surface of the distal end portion, and a hole portion 27 provided at the proximal end portion of the fourth cylindrical member 23. By being engaged with 27, it is prevented from coming off, and the spring retaining member 4 can be reliably prevented from falling off.

  Next, when the finger hook portion 7 is further pressed and the inner cylindrical tube member 6 is moved to the distal end portion side relative to the outer cylindrical tube member 5, as shown in FIG. The distal end portion of the hook-like portion 28 protruding from the distal end surface of the contact portion 23 comes into contact with and engages with the proximal end portion of the finger hook portion 7. As a result, the inner tube member 6 cannot move backward relative to the outer tube member 5, and the outer tube member 5 cannot move forward relative to the inner tube member 6. Therefore, the re-projection of the inner needle main body 11 accommodated in the inner tube member 6 can be prevented.

  Further, in order to prevent the outer tube member 5 and the inner tube member 6 from moving relative to each other, the inner tube member 6 is provided with a pair of protrusions (not shown) protruding laterally from the outer peripheral surface. The protrusions may be engaged with a pair of holes (not shown) provided at the tip of the outer tube member 5.

  In this embodiment, the distal end portion of the hook-shaped portion 28 is engaged with the proximal end portion of the finger hook portion 7 to prevent the inner needle body 11 from re-projecting. You may make it incline the axis | shaft of the internal peripheral surface of the member 25 with respect to the axis | shaft of the spring stopper member 4. FIG. As a result, the inner needle base 12 engaged with the spring stopper member 4 and the axis of the inner needle main body 11 attached to the inner needle base 12 are inclined with respect to the axis of the inner cylindrical tube member 6. Also, the re-projection of the inner needle body 11 can be prevented.

  Next, in the indwelling needle assembly 1 of the present embodiment, the sixth cylindrical body 30 of the inner tube member 6 is removed from the outer needle base 10 and an infusion line is connected to the outer needle base 10. In addition, the inner tube member 6 removed from the outer needle base 10 and the outer tube member 5 assembled to the inner tube member 6 together with the inner needle member 3 accommodated in the inner tube member 6. It is discarded in a predetermined disposal box or the like.

  Further, as shown in FIG. 13, when the protector 34 is removed from the outer tube member 5 and the outer needle member 2 is exposed, the tip of the inner needle body 11 is made to have a high hardness such as a wall, a floor, and a stand. If it is hit hard, the cutting edge may be crushed and cannot be punctured. Further, in such a case, even if the blade edge is not crushed, it is contaminated and it is not preferable to use it for puncture.

  Here, in the indwelling needle assembly 1 of the present embodiment, as shown in FIG. 6, the engagement pins 13 and 13 of the inner needle base 12 are brought into contact with the outer surface side of the distal end portion of the third cylindrical member 21. ing. Therefore, when the tip of the inner needle body 11 is hit with a material having a large hardness, the engaging pins 13 and 13 are pressed toward the tip by the outer surface of the tip of the third cylindrical member 21, and FIG. In the same manner as shown in FIG. As a result, as in the case shown in FIG. 20, the spring stopper 4 is elastically retracted by the elastic force of the spring 19 and moved to the proximal end side, and the inner needle body 11 is moved into the inner tube member 6. Be drawn into.

  Therefore, the inner needle main body 11 cannot be physically used for puncturing, and it is possible to prevent the inner needle main body 11 whose blade edge is crushed or contaminated from being used for puncturing.

  DESCRIPTION OF SYMBOLS 1 ... Indwelling needle assembly, 2 ... Outer needle member, 3 ... Inner needle member, 4 ... Spring stopper member, 5 ... Outer cylinder pipe member, 6 ... Inner cylinder pipe member, 7 ... Finger hook part

Claims (6)

An outer needle member comprising an outer needle body and an outer needle base provided at a proximal end portion of the outer needle body;
An inner needle main body inserted into the outer needle main body, and a proximal end portion of the inner needle main body that is provided at a proximal end portion of the inner needle main body when the inner needle main body is inserted into the outer needle main body; An inner needle base projecting from the outer needle base, a pair of engagement pins projecting laterally from the central portion of the inner needle base, and a pair of engagement projecting laterally from the proximal end portion of the inner needle base An inner needle member comprising a protrusion;
A first cylindrical member into which a portion on the proximal end side from the engagement pin of the inner needle base is inserted, and is connected to the proximal end side of the first cylindrical member and is larger than the first cylindrical member. A second cylindrical member having a diameter, and an engaging portion provided on an inner peripheral surface of a step portion between the first cylindrical member and the second cylindrical member and engaged with the engaging protrusion. A biasing means locking member for locking one end of the biasing means disposed on the outer peripheral surface of the first cylindrical member with the outer peripheral surface of the stepped portion;
The first cylindrical member of the biasing means locking member is accommodated, the other end of the biasing means is locked on the inner surface side of the tip, and the engagement pin is engaged on the outer surface of the tip. An outer tube member comprising: a third cylindrical member; and a fourth cylindrical member that is connected to the outer peripheral side of the third cylindrical member via a connecting member and accommodates the third cylindrical member;
A fifth cylindrical member that is movably fitted between the third cylindrical member and the fourth cylindrical member of the outer tube member, and a length direction on a side surface of the fifth cylindrical member A space portion that extends along the axis and accommodates the engagement pin, and is provided at the distal end portion of the fifth cylindrical member, and the outer needle base is fitted on the outer needle base and the inner needle base extends from the engagement pin to the distal end. An inner tube member comprising a sixth cylindrical member having a smaller diameter than the fifth cylindrical member into which the side portion is inserted;
When the fifth cylindrical member is fitted between the third cylindrical member and the fourth cylindrical member of the outer cylindrical member, the fifth cylindrical member is connected to the outer peripheral surface of the inner cylindrical member. A finger hook portion located on the outer peripheral surface of the cylindrical member of 4,
The outer needle body and the inner needle body are punctured into the blood vessel, and the inner needle body guides the outer needle body to advance a predetermined distance, and then the finger hooking portion is pressed in the puncturing direction of the outer needle body to The cylindrical tube member is moved forward relative to the outer cylindrical tube member, and the engagement pin is pressed toward the distal end side at the proximal end portion of the space portion to be broken and removed, thereby removing the inner needle member. The engagement with the outer cylinder member is released, the urging means locking member is retracted by the urging force of the urging means, and the inner needle base engaged with the urging means locking member is interposed. The indwelling needle assembly is characterized in that the inner needle body is accommodated in the inner tube member.   2. The indwelling needle assembly according to claim 1, wherein the outer tube member houses the biasing means locking member that moves backward by the biasing force of the biasing means, and moves backward together with the biasing means locking member. An indwelling needle assembly comprising a bottomed cylindrical body at a base end portion.   3. The indwelling needle assembly according to claim 2, wherein the outer tubular tube member includes a pair of holes at a base end portion, and the pair of bottomed tubular bodies protrude laterally from an outer peripheral surface of a distal end portion. The indwelling needle assembly is characterized in that when the bottomed cylindrical body is retracted, the protrusion engages with the hole to prevent it from coming off.   The indwelling needle assembly according to any one of claims 1 to 3, wherein the outer tube member includes a flange-shaped member protruding in a length direction from a distal end surface of the fourth cylindrical member, The hook-shaped member is engaged with the base end portion of the finger hook portion when the inner cylindrical tube member advances relative to the outer cylindrical tube member, and is accommodated in the outer cylindrical tube member. An indwelling needle assembly that prevents re-projection of the inner needle body.   5. The indwelling needle assembly according to claim 1, wherein the biasing means locking member allows only a gas to pass through a base end portion of the second cylindrical member and allows the liquid to pass therethrough. An indwelling needle assembly comprising an air diffuser for suppressing the above.   The indwelling needle assembly according to any one of claims 1 to 5, wherein the engagement pin is brought into contact with an outer surface side of a distal end portion of the third cylindrical member, and the inner needle main body strikes. An indwelling needle assembly, wherein the indwelling needle assembly is pressed to the distal end side by the outer surface side of the distal end portion of the third cylindrical member when received and broken and removed.