JP2019088580A - Indwelling needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indwelling needle in which flashback blood does not easily remain on an outer needle base. SOLUTION: An indwelling needle 1 has an outer needle 2 through which an inner needle can be inserted, a tubular outer needle base 3 provided at a base end of the outer needle 2, and an inner needle through which the inner needle can be inserted. A hemostatic valve 4 that prevents blood from leaking from the outer needle base 3 after being removed, and an annular ventilation filter that allows air in the outer needle base 3 to pass through and suppresses or blocks the passage of blood in the outer needle base 3. 14 and. Inside the outer needle base 3, an inner cylinder member 6 that is inserted through the ventilation filter 14 and is capable of advancing from the base end position to the tip position is arranged in the outer needle base 3, and the hemostatic valve 4 is attached to the inner cylinder member 6. In the outer needle base 3, the region on the tip end side of the outer needle base 3 with respect to the tip end of the ventilation filter 14 is set as the tip region 16, and the outer peripheral surface of the inner cylinder member 6 is on the base end side of the outer needle base 3. The liquid supplied from the above flows in, and the ventilation filter 14 blocks the connection with the tip region 16 at the proximal position, and the flow path 9 connected to the distal region 16 is provided at the distal position. .. [Selection diagram] FIG. 5

Description

  The present invention relates to an indwelling needle provided with a check valve.

  Conventionally, an outer needle through which the inner needle can be inserted, an outer needle base provided at the proximal end of the outer needle, a hemostatic valve formed of an elastic member having a cutout, an inner peripheral surface of the hemostatic valve and the outer needle base There is known an indwelling needle including an air passage formed between the inner needle and the inner peripheral surface of the outer needle and defined in the hemostatic valve to release the air out of the outer needle (for example, , Patent Document 1).

  The indwelling needle is inserted into the patient's blood vessel with the inner needle inserted through the incision of the hemostasis valve and into the outer needle, and then the blood is flushed out (flashback) flowing into the outer needle and outer needle base. Air in the needle and outer needle base is exhausted from the air passage. Then, after confirming that the outer needle has been pierced into the blood vessel by the blood flowing into the outer needle base, the inner needle is pulled out. Then, the connector of the infusion line connected to the infusion bag is connected to the outer needle base, the hemostatic valve is opened, and a liquid such as an infusion or a medical solution is supplied to the patient.

JP, 2015-80707, A

  In the conventional indwelling needle, since the liquid supplied to the patient is supplied by opening the incision of the hemostatic valve, the flashback blood remains on the inner peripheral surface (especially on the hemostatic valve side) of the outer needle base. This may cause problems such as occurrence of thrombus due to blood retention, breeding of bacteria, and discomfort to a patient who visually recognizes an outer needle group on which blood remains.

  An object of this invention is to provide the indwelling needle which the blood of a flashback does not remain easily in an outer-needle base in view of the above point.

[1] In order to achieve the above object, the present invention is
An outer needle through which the inner needle can be inserted (for example, the outer needle 2 of the embodiment, hereinafter the same);
A tubular outer needle base (for example, the outer needle base 3 according to the embodiment, hereinafter the same) provided at the proximal end of the outer needle;
The hemostasis valve (for example, the hemostasis valve 4 according to the embodiment, hereinafter the same) which is capable of inserting the inner needle and preventing blood from leaking from the outer needle group after the inner needle is withdrawn.
An indwelling needle comprising
An inner cylindrical member (for example, the inner cylindrical member 6 of the embodiment, hereinafter the same) which can be advanced from the proximal end position to the distal end position in the outer needle base.
An annular ring positioned between the outer peripheral surface of the inner cylindrical member and the inner peripheral surface of the outer needle base to allow the air in the outer needle base to pass and to suppress or block the passage of blood in the outer needle base A ventilation filter (for example, the ventilation filter 14 of the embodiment, hereinafter the same), and
The hemostatic valve is provided on the inner cylinder member,
In the outer needle base, the area on the tip side of the outer needle base with respect to the tip of the ventilation filter is taken as a tip area (for example, the tip area 16 of the embodiment, hereinafter the same).
The liquid supplied from the proximal end side of the outer needle base flows into the outer peripheral surface of the inner cylindrical member, and at the proximal end position, connection with the distal end region is blocked by the ventilation filter. It is characterized in that a flow path (for example, the notch 9 in the embodiment, hereinafter the same) connected to the tip end region is provided.

  According to the present invention, when the inner cylinder member is positioned at the base end position, the flow path provided on the outer peripheral surface of the inner cylinder member is not connected to the distal end region, and blood leaks from the outer needle group by the hemostatic valve. Can be prevented. When the liquid such as an infusion solution or a drug solution is supplied to the patient, the inner cylinder member is moved to the front end position, whereby the front end of the flow path is positioned closer to the front end than the ventilation filter, and the outer peripheral surface of the inner cylinder member The provided flow path and tip area are connected, and liquid is supplied to the patient from around the hemostatic valve through the flow path and tip area, through the outer needle.

  Therefore, as in the conventional indwelling needle, the liquid is not supplied from the cut portion of the valve body, and the liquid is supplied from the periphery of the hemostasis valve, so that it remains on the inner peripheral surface of the outer needle base (especially the hemostasis valve side). The easy flashback blood can be returned to the patient together with the liquid supplied to the patient, and the residual flashback blood on the outer needle group can be suppressed to suppress discomfort to the patient etc. .

  [2] Further, in the present invention, the inner circumferential surface of the outer needle base is a projection (for example, the projection 15 of the embodiment) projecting radially inward for positioning of the ventilation filter. Preferably, the tip end edge of the ventilation filter is locked to the projection when the inner cylinder member is at least located at the tip position. According to this configuration, when the ventilation filter is disposed in the outer needle base, it is possible to prevent the inner cylinder member from being disposed erroneously ahead of the flow path at the tip position, and positioning can be easily performed. it can.

  [3] Further, in the present invention, the flow path is constituted by a notch (for example, the notch 9 of the embodiment, hereinafter the same) cut away from the base end to the tip of the inner cylindrical member. Can. According to this configuration, it is possible to suppress the flashback blood from remaining on the outer needle base by moving the inner cylindrical member to the distal end position and connecting the notch with the large diameter portion.

  [4] Further, in the present invention, the cutaway portion may be cut out so as to allow the inner peripheral surface and the outer peripheral surface of the inner cylindrical member to communicate with each other. According to this configuration, it is possible to supply a liquid such as an infusion solution or a drug solution supplied from the proximal end of the outer needle base to the patient using the inner side of the inner cylindrical member through which the inner needle can be inserted. Can reduce the resistance of

Explanatory drawing which shows the indwelling needle of embodiment of this invention. Explanatory drawing which decomposes | disassembles and shows the indwelling needle of this embodiment. Sectional drawing which shows the state which the inner cylinder member of the indwelling needle of this embodiment was located in proximal end position. The perspective view which shows the state which the inner cylinder member of the indwelling needle of this embodiment was located in the front end position. Sectional drawing which shows the state which the inner cylinder member of the indwelling needle of this embodiment was located in the front end position.

  An indwelling needle according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

  As shown in the perspective view of FIG. 1 and the exploded view of FIG. 2, the indwelling needle 1 of the present embodiment is provided at the proximal end of the outer needle 2 and the outer needle 2 through which the inner needle (not shown) can be inserted. A tubular outer needle base 3, a hemostasis valve 4 which can be inserted through the inner needle, and which prevents the flashback blood from leaking out of the outer needle base 3 after the inner needle is pulled out; And an annular ventilation filter for passing air from the proximal end side of the outer needle group 3 to the outside of the outer needle group 3 to suppress or block the passage of blood in the flashback in the outer needle group 3. The ventilation filter 14 is formed of a porous body (for example, a sintered body of polyethylene, polyurethane, or the like) so as to suppress the passage of blood in the flashback and allow the passage of air. In addition, the ventilation filter 14 is disposed between the outer peripheral surface of the inner cylindrical member 6 and the inner peripheral surface of the outer needle base 3.

  A cylindrical inner cylinder member 6 is disposed in the outer needle base 3. The inner cylinder member 6 is movable in the outer needle base 3 toward the distal direction of the outer needle base 3. In the description of the embodiment, the initial position before moving in the distal direction is the proximal position, the distal direction The position at which the forward movement of H has been completed is defined as the tip position.

  The hemostatic valve 4 is formed of a cylindrical elastic member, and is provided with a cutting portion 4a cut from the tip to the proximal end in the central portion. The inner needle (not shown) passes through the incision 4 a and is inserted into the outer needle 2. In addition, the hemostatic valve 4 is inserted into the inner cylindrical member 6.

  On the inner peripheral surface of the outer needle base 3, a protruding portion 15 which protrudes inward in the radial direction for positioning the ventilation filter 14 is provided. The tip end edge of the ventilation filter 14 is locked to the protrusion 15 when the inner cylindrical member 6 is positioned at least at the tip position. At this time, in the state where the inner cylindrical member 6 is not located at the tip end position, the ventilation filter 14 needs to be positioned so as to block the connection between the notch 9 and the tip region 16 described later.

  By locking the ventilation filter 14 to the projection 15 in this manner, it is possible to prevent the ventilation filter 14 from being disposed erroneously ahead of the notch 9 when the inner cylindrical member 6 is at the tip position, and positioning is easy. Can be done.

  The inner diameter of the protruding portion 15 is set larger than the outer diameter of the inner cylindrical member 6 so that the protruding portion 15 does not prevent the air in the outer needle base 3 from being released from the ventilation filter 14. The protrusions 15 may not be annular, and may be provided at predetermined intervals in the circumferential direction.

  The inner cylindrical member 6 is formed with a pair of cutouts 9 which are cut out from the proximal end toward the distal end. The notch 9 is cut out so as to allow the inner circumferential surface and the outer circumferential surface of the inner cylindrical member 6 to communicate with each other. The cutaway portion 9 may be formed on the outer peripheral surface of the inner cylindrical member 6 so that an infusion or a drug solution is supplied from the proximal end side of the outer needle base 3, and the cutaway portion 9 necessarily reaches the inner peripheral surface It does not have to be The hemostatic valve 4 is located on the tip side of the notch 9. In addition, a rib 6 a is provided on the inner peripheral surface of the inner cylindrical member 6. The rib 6a compensates for the reduction in strength due to the formation of the notch 9.

  Here, in the outer needle base 3, a region on the tip side of the outer needle base 3 with respect to the tip of the ventilation filter 14 is referred to as a tip region 16.

  As shown in FIG. 3, when the inner cylindrical member 6 is located at the base end position in the outer needle base 3, the ventilation filter 14 prevents the connection between the notch 9 and the distal end region 16. Conversely, as shown in the perspective view of FIG. 4 and the cross-sectional view of FIG. 5, when the inner cylindrical member 6 is positioned at the distal end position in the outer needle base 3, the notch 9 and the distal end region 16 Connected The dotted arrows in FIG. 5 indicate the flow of liquid.

  According to the indwelling needle 1 of the first embodiment, when the inner cylindrical member 6 is positioned at the base end position, the notch 9 provided on the outer peripheral surface of the inner cylindrical member 6 is connected to the distal end region 16 through the ventilation filter 14. The hemostatic valve 4 can prevent the blood of the flashback from spilling out of the outer needle hub 3. Then, when a liquid such as an infusion solution or a drug solution is supplied to the patient, the inner cylindrical member 6 is moved to the tip position by pressing the inner cylindrical member 6 using the male connector 11 connected to the outer needle base 3 or the like. The notch 9 provided on the outer peripheral surface of the is connected to the distal end region 16, and the liquid is supplied to the patient from the periphery of the hemostatic valve 4 through the notch 9 and the distal end region 16 through the outer needle 2.

  Therefore, the liquid is supplied from the periphery of the hemostasis valve 4 without the liquid being supplied from the incised portion of the hemostasis valve 4 as in the conventional indwelling needle, the inner peripheral surface of the outer needle base 3 (especially hemostasis Flashback blood that tends to remain on the valve 4 side can be returned to the patient together with the fluid supplied to the patient, and the occurrence of blood clotting due to blood retention is suppressed by preventing the flashback blood from remaining on the outer needle group 3 Or, it can suppress breeding of various bacteria, giving discomfort to patients and the like. In the present embodiment, the notch 9 corresponds to the flow passage of the present invention.

  Further, the notch portion 9 is cut away so as to allow the inner peripheral surface and the outer peripheral surface of the inner cylindrical member 6 to communicate with each other, whereby a liquid such as an infusion solution or a drug solution supplied from the proximal end of the outer needle base 3 can be obtained. The space inside the inner cylindrical member 6 through which the inner needle can be inserted can also be supplied to the patient, and the resistance at the time of liquid supply can be reduced.

  In the present embodiment, although the one in which the hemostatic valve 4 is provided in the inner cylindrical member 6 has been described, the hemostatic valve of the present invention is not limited to this. For example, the distal end edge of the inner cylindrical member 6 protrudes forward A protruding portion is formed, and a protruding portion protruding so as to expand radially outward is formed on the tip outer peripheral surface of the protruding portion, and the protruding portion and the tip opening of the inner cylindrical member 6 are closed normally A hemostatic valve having a C-shaped cross section may be provided at the tip of the inner cylindrical member 6 so as to cover it.

  Moreover, in this embodiment, the thing which positions the ventilation | gas_flowing filter 14 by the protrusion part 15 was demonstrated. However, the configuration of the indwelling needle of the present invention is not limited to this, and for example, the ventilating filter 14 may be fixed to the inner peripheral surface of the outer needle base 3 by press fitting or the like without providing a protrusion.

DESCRIPTION OF SYMBOLS 1 indwelling needle 2 outer needle 3 outer needle base 4 hemostatic valve 4 a cut portion 6 inner cylindrical member 6 a rib 9 cut portion (flow path)
11 Male connector 14 Ventilation filter 15 Protrusion 16 Tip area

Claims (4)

An outer needle through which an inner needle can be inserted;
A cylindrical outer needle base provided at the proximal end of the outer needle;
A hemostasis valve, through which the inner needle is insertable, and which prevents blood from leaking from the outer needle base after the inner needle is withdrawn;
An indwelling needle comprising
An inner cylindrical member capable of advancing from a proximal position to a distal position within the outer needle base;
An annular ring positioned between the outer peripheral surface of the inner cylindrical member and the inner peripheral surface of the outer needle base to allow the air in the outer needle base to pass and to suppress or block the passage of blood in the outer needle base The ventilation filter, and is placed
The hemostatic valve is provided on the inner cylinder member,
In the outer needle base, an area on the tip side of the outer needle base with respect to the tip of the ventilation filter is a tip area,
The liquid supplied from the proximal end side of the outer needle base flows into the outer peripheral surface of the inner cylindrical member, and at the proximal end position, connection with the distal end region is blocked by the ventilation filter. An indwelling needle characterized in that a flow path connected to the distal end region is provided. The indwelling needle according to claim 1, wherein
A radially inward projecting portion is provided on the inner circumferential surface of the outer needle base for positioning the ventilation filter,
The tip end edge of the ventilation filter is locked to the projection when the cylindrical member is at least at the tip position. The indwelling needle according to claim 1 or 2, wherein
The indwelling needle according to claim 1, wherein the flow passage is a notch which is cut away from a proximal end to a distal end of the inner cylindrical member. The indwelling needle according to claim 3, wherein
The indwelling needle characterized in that the cutaway portion is cut out so as to communicate the inner peripheral surface and the outer peripheral surface of the inner cylindrical member.