JP7383905B2 - indwelling needle assembly - Google Patents

Description

The present invention relates to an indwelling needle assembly used, for example, when performing hemodialysis or blood sampling.

Conventionally, an outer needle hub has been provided at the proximal end of an outer needle that is percutaneously inserted into a blood vessel, and the internal flow path from the outer needle to the outer needle hub is connected to the external flow path at the outer needle hub. An indwelling needle that makes it possible is known.

In addition, as shown in Japanese Patent Application Laid-Open No. 2005-270638 (Patent Document 1), the indwelling needle is combined with an inner needle for puncture having an inner needle hub on the proximal end to form an indwelling needle assembly. It is often provided to medical sites.

With such an indwelling needle assembly, the inner needle inserted into the outer needle is inserted into a blood vessel in a patient's arm, etc., and the inner needle is removed from the outer needle, so that the outer needle can be left in the blood vessel with the outer needle stuck in the blood vessel. can. For example, an external flow path such as a tube or syringe led to a blood circuit for dialysis is connected to the outer needle hub, and used for treatments such as hemodialysis and blood collection.

Japanese Patent Application Publication No. 2005-270638

By the way, when puncturing a patient's blood vessel with the inner needle of the indwelling needle assembly, the medical worker performing the puncture should place the inner needle at a position closer to the needle tip in order to suppress wobbling of the needle tip during puncture and puncture accurately. There is a tendency to desire to have an indwelling needle assembly. Therefore, for example, when the outer needle hub has a long structure including a soft tube as in Patent Document 1, a medical worker may hold the outer needle hub at a position closer to the needle tip than the inner needle hub. Puncture may also be performed.

However, according to the inventor's study, the outer needle hub allows a certain amount of movement relative to the inner needle that pierces the patient's skin or blood vessel wall, so puncturing is carried out by holding the outer needle hub. In this case, the inner needle is not supported stably, and the inner needle may move relative to the outer needle hub and the outer needle during puncturing. Therefore, the tip of the inner needle may be misaligned and not puncture the blood vessel properly, or the outer needle may overlap the tip of the inner needle, reducing the sharpness of the inner needle and increasing the pain during puncture. We have obtained new knowledge that suggests that this is possible.

An object of the present invention is to provide an indwelling needle assembly with a novel structure that can suppress pain during puncturing and more accurately puncture.

Hereinafter, preferred embodiments for understanding the present invention will be described. However, each of the embodiments described below is described by way of example, and may not only be adopted in combination with each other as appropriate, but also be described in each embodiment. The plurality of components can be recognized and employed as independently as possible, and can also be appropriately employed in combination with any of the components described in other embodiments. Accordingly, the present invention is not limited to the embodiments described below, and various other embodiments can be realized.

A first aspect is an indwelling needle assembly in which an inner needle having an inner needle hub at the proximal end is removably inserted through an outer needle having an outer needle hub at the proximal end, the outer needle hub comprises a needle joint to which the outer needle is fixed, a flow path connection to which the outer needle is fixed, a flow path connection to which the outer needle is fixed, and a soft tube that connects the needle joint and the flow path connection. The hub is provided with a puncture operation part extending toward the distal end, and the puncture operation part extends to the outer periphery of the flow path connection part without being connected to the needle joint part and without covering the outer needle. It is something that

According to the indwelling needle assembly structured according to this aspect, by holding the puncture operation part on the inner needle hub side that extends to the outer periphery of the outer needle hub and making the puncture, the puncture is performed while holding the outer needle hub side. The inner needle is less likely to move as it would in the case of a case, and highly accurate puncturing is possible. In particular, when the outer needle hub has a long structure in which the needle joint part and the flow path connection part are connected by a soft tube, by holding the inner needle side closer to the needle tip, the soft tube can be deformed. This prevents the needle tip from wobbling and improves puncturing accuracy.

By preventing the outer needle from moving relative to the inner needle, it is possible to prevent the outer needle from covering the tip of the inner needle, thereby avoiding deterioration in the sharpness of the tip of the inner needle. This makes it possible to suppress pain when puncturing the patient with the inner needle.

In a second aspect, in the indwelling needle assembly described in the first aspect, the puncture operation section extends to the outer periphery of the soft tube.

According to the indwelling needle assembly structured according to this aspect, the puncturing operation part extends further to the distal end side, so that the inner needle side can be held at a position closer to the needle tip, and highly accurate puncturing is possible. become. In particular, by extending the puncturing operation section to the outer periphery of the soft tube, puncturing while holding the easily deformable soft tube becomes easier to avoid.

In a third aspect, in the indwelling needle assembly described in the first or second aspect, the puncture operation section is cylindrical.

According to the indwelling needle assembly having the structure according to this aspect, the shape stability of the puncture operation section is improved, so that the precision of the puncture procedure is further improved. Moreover, the outer periphery of the outer needle hub is surrounded by the cylindrical puncture operation section, so that the outer needle hub is protected by the puncture operation section.

A fourth aspect is the indwelling needle assembly according to any one of the first to third aspects, wherein the outer surface of the puncture operation section is provided with a pair of support surfaces that are supported by fingers. It is something.

According to the indwelling needle assembly structured according to this aspect, by holding the pair of support surfaces between the fingers, the puncture operation section can be stably supported, and punctures can be performed with high precision. Can be done.

According to the present invention, it is possible to provide an indwelling needle assembly with a novel structure that can suppress pain during puncture and more accurately puncture.

A perspective view showing an indwelling needle assembly as a first embodiment of the present invention Right side view of the indwelling needle assembly shown in Figure 1 A plan view of the indwelling needle assembly shown in FIG. IV-IV sectional view in Figure 3 A plan view showing how the indwelling needle assembly shown in FIG. 1 is used during puncture. A sectional view showing a state in which the inner needle is removed from the outer needle in the indwelling needle assembly shown in FIG. 4.

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an indwelling needle assembly 10 as a first embodiment of the present invention. The indwelling needle assembly 10 has a structure in which an inner needle 14 is removably inserted into an outer needle 12. In the following description, the axial direction basically refers to the left-right direction in FIG. 2, which is the needle axis direction of the outer needle 12 and the inner needle 14. Further, the distal end side refers to the left side in FIG. 2, which is the needle tip side, and the proximal end side refers to the right side in FIG. 2, respectively.

The outer needle 12 is shaped like a small diameter tube made of synthetic resin or the like. The outer needle 12 has a tapered tip whose diameter gradually decreases toward the tip.

An outer needle hub 16 is provided on the proximal end side of the outer needle 12. The outer needle hub 16 has a cylindrical shape as a whole, and has a structure in which a needle joint portion 18 and a flow path connecting portion 20 are connected by a soft tube 22, as shown in FIG.

The needle joint portion 18 is made of hard synthetic resin. As shown in FIGS. 1 to 4, the needle joint portion 18 has a tapered cylindrical shape that becomes smaller in diameter toward the tip. The proximal end portion of the outer needle 12 is inserted and fitted into the inner periphery of the needle joint portion 18 . As a result, the outer needle 12 has the needle joint portion 18 fixed to its base end portion, and extends from the needle joint portion 18 toward the distal end side.

The flow path connection part 20 has a cylindrical structure having a connection part connected to an external flow path, which will be described later, at the base end, and in this embodiment, as shown in FIG. It has a structure in which a hemostasis valve 26 and a pusher 28 are housed in a housing 24. In the valve housing 24, the distal end portion of a cylindrical pusher guide 32 is inserted into the base end portion of a cylindrical cover member 30, so that the cover member 30 and the pusher guide 32 are aligned in the axial direction. It is constructed by being connected. The pusher guide 32 has a base end portion that extends in the axial direction with a substantially constant cross-sectional shape, and a male threaded portion 34 that projects toward the outer periphery is integrally formed at the base end portion.

The hemostasis valve 26 has a generally disk shape as a whole, and is made of an elastic material such as resin elastomer or rubber. The hemostasis valve 26 has a radial notch 35 formed in the central portion of the disk shape, and the notch 35 is opened and closed by elastic deformation of the central portion. The outer peripheral portion of the hemostasis valve 26 is held between the tip of the pusher guide 32 and a valve support member 36 held on the inner periphery of the cover member 30 in the axial direction. Thereby, the hemostatic valve 26 is supported by the valve housing 24, and the inner cavity of the valve housing 24 is blocked by the hemostasis valve 26.

The pusher 28 has a cylindrical shape and is inserted into the inner circumference of the pusher guide 32. The pusher 28 has a base end portion having a substantially constant outer diameter, and a distal end portion of the pusher 28 having a tapered outer circumferential surface that becomes smaller in diameter toward the distal end side.

The soft tube 22 that connects the needle joint part 18 and the flow path connection part 20 is made of resin elastomer, rubber, or the like, and is curved and deformable, and is also allowed to change its cross-sectional shape. By providing the soft tube 22, for example, it becomes easier to connect an external flow path, which will be described later, to the outer needle hub 16 while the outer needle hub 16 is fixed to the skin. The tip portion of the soft tube 22 is inserted between the needle joint portion 18 and the outer needle 12 and fixed thereto. The proximal end portion of the soft tube 22 is inserted into and fixed to the inner periphery of a tube connecting member 37 that is attached to the cover member 30 of the flow path connecting portion 20 in an inserted state. Thereby, the needle joint part 18 and the flow path connection part 20 are connected by the soft tube 22, and the lumen of the needle joint part 18 and the lumen of the flow path connection part 20 are connected through the lumen of the soft tube 22. are interconnected.

The inner needle 14 is inserted into each lumen of the outer needle 12, the needle joint 18, the soft tube 22, and the flow path connecting portion 20 from the proximal end side. The inner needle 14 is a hollow metal needle, and its distal end surface is sloped to form an acute-angled needle tip.

An inner needle hub 38 is attached to the proximal end side of the inner needle 14. The inner needle hub 38 has a pedestal portion 40 to which the proximal end portion of the inner needle 14 is fixed in the inserted state, and a connecting portion 42 is provided on the proximal end side of the pedestal portion 40. A protector accommodating portion 44 is provided on the distal end side.

The connecting portion 42 has a cylindrical shape, and an inner needle cap 46 is removably inserted and attached thereto. The inner needle cap 46 has a substantially stepped cylindrical shape with a step provided at the middle portion in the needle axis direction. The inner needle cap 46 is provided with a ventilation filter (not shown). This ventilation filter has the property of allowing gas to pass through but not liquid, and by providing the ventilation filter in the inner cavity of the inner needle cap 46, blood that has passed through the inner needle 14 will not leak to the outside. It looks like this. Note that if the inner needle hub 38 and the inner needle cap 46 are made transparent, the puncture of the blood vessel can be easily confirmed by flashback.

The protector housing portion 44 has a cylindrical shape. Further, a puncture operation section 48 is provided on the distal end side of the protector housing section 44 . The puncture operation section 48 has a cylindrical shape with a larger diameter than the protector accommodating section 44 . The puncture operation section 48 extends from the protector accommodating section 44 toward the distal end side, and is arranged so as to surround a part of the outer peripheral side of the outer needle hub 16 when the inner needle 14 is inserted into the outer needle 12. ing. That is, the puncture operation section 48 extends from the proximal end of the flow path connection section 20 of the outer needle hub 16 to the distal side, and reaches the outer periphery of the flow path connection section 20 . The puncture operation section 48 of this embodiment extends beyond the distal end of the channel connection section 20 to the distal end side, and reaches the outer periphery of the soft tube 22. It is desirable that the puncture operation section 48 has a length of 10 mm or more.

As shown in FIGS. 1 and 2, a pair of support surfaces 50, 50 are provided on the outer surface of the puncture operation section 48. The support surfaces 50 are provided on both opposing sides of the outer circumferential surface of the puncture operation section 48 and extend in the axial direction. The pair of support surfaces 50, 50 are provided so as to be located on both sides orthogonal to the up-down direction in a state where the inclined surface of the tip of the inner needle 14 faces upward. The pair of support surfaces 50, 50 do not reach the tip of the puncture operation section 48, and the tip portion is an inclined surface that slopes laterally outward toward the tip side. Since the pair of support surfaces 50, 50 do not reach the tip of the puncture operation part 48, the tip part of the puncture operation part 48 is made thicker, and the shape stability of the tip part of the puncture operation part 48 is increased. ing. Further, each support surface 50 is provided with a non-slip member 52 extending in the circumferential direction of the puncture operation section 48 . The anti-slip elements 52 are protrusions that protrude from the support surface 50, and a plurality of anti-slip elements are provided at predetermined intervals in the axial direction of the puncture operation section 48.

A protector housing 54 is disposed on the inner peripheral side of the protector accommodating portion 44 . The protector housing 54 includes a cylindrical housing section 56 and a lid 58 that closes an opening on the distal end side of the housing tube section 56 . Further, the lid body 58 has a plate-like part on the distal end side and a plate-like part on the proximal end side separated from each other in the axial direction, and a needle tip protector 60 is disposed between these plate-like parts. The needle tip protector 60 includes a fixing member 62 and a shielding member 64 housed in the protector housing 54. The fixing member 62 and the shielding member 64 are arranged apart from each other with the inner needle 14 in between in the direction perpendicular to the axis. One of the fixed member 62 and the shielding member 64 is made of a magnet, and the other is made of a magnet or a ferromagnetic material. A gravitational force is acting. The fixing member 62 is fixed to the tip of the housing tube 56. The shielding member 64 is movable in the approaching direction with respect to the fixing member 62, and when the inner needle 14 is inserted between the fixing member 62 and the shielding member 64, the shielding member 64 cannot be moved toward the fixing member 62. It is blocked by needle 14.

Protector housing 54 is connected to outer needle hub 16 by connector cap 66 . The connector cap 66 includes a bottom wall portion 68 that extends in the direction perpendicular to the axis. The bottom wall portion 68 has an annular plate shape, and a tubular protrusion 70 that protrudes toward the distal end is integrally formed at the inner peripheral end. A circumferential wall 72 extending toward the distal end and a pair of elastic pieces 74 , 74 extending toward the proximal end are integrally formed at the outer peripheral end of the bottom wall 68 .

The circumferential wall portion 72 has a cylindrical shape, and a female thread 76 is provided on the inner peripheral surface. Then, the base end portion of the pusher guide 32 constituting the outer needle hub 16 is inserted into the inner periphery of the circumferential wall portion 72, and the male threaded portion 34 of the pusher guide 32 and the female thread 76 of the circumferential wall portion 72 are screwed together. By mating, the connector cap 66 is attached to the proximal end portion of the outer needle hub 16.

The pair of elastic pieces 74, 74 are plate-shaped and are allowed to be elastically deformed in the thickness direction. The pair of elastic pieces 74, 74 are each provided with a locking pawl 78 that protrudes inward at the protruding tip. The locking pawl 78 has a tapered cross-sectional shape whose width in the axial direction decreases toward the inner peripheral side, which is the protruding tip. Then, the tip portion of the protector housing 54 is inserted between the pair of elastic pieces 74, 74 facing each other, and each locking claw 78 of the pair of elastic pieces 74, 74 is locked to the protector housing 54 in the axial direction. Ru. Thereby, the connector cap 66 is attached to the protector housing 54, and the outer needle hub 16 and the protector housing 54 are connected via the connector cap 66.

The puncture operation section 48 of the inner needle hub 38 is inserted into the connector cap 66 . As a result, the deformation of the pair of elastic pieces 74, 74 toward the outer periphery is regulated by the puncture operation section 48, and the connection between the connector cap 66 and the protector housing 54 by the pair of locking claws 78, 78 is stabilized. maintained.

In the indwelling needle assembly 10 having such a structure, the inner needle 14 is inserted into a blood vessel in a patient's arm (not shown). As shown in FIG. 5, a medical worker who punctures a blood vessel holds the puncture operation part 48 of the indwelling needle assembly 10 with his or her fingers and punctures the patient's arm with the inner needle 14. do. The medical worker places his fingertips on the pair of support surfaces 50, 50 and holds the puncture operation section 48 between them. This allows the medical worker to stably puncture the patient with the inner needle 14 from the needle tip.

Since the part of the puncture operation section 48 held by the medical worker's fingertips is the pair of support surfaces 50, 50, the puncture operation section 48 can be easily held in a positioned position in the circumferential direction. Further, since the anti-slip 52 is provided on each of the pair of support surfaces 50, 50, a medical worker can efficiently apply force in the puncturing direction to the indwelling needle assembly 10. Moreover, since the distal end portions of the pair of support surfaces 50, 50 are each sloped, the fingertip is less likely to slip toward the distal end side of the support surfaces 50, 50, and force in the puncturing direction can be applied with greater security. .

Since the puncture operation section 48 supported by a medical worker is integrally formed with the inner needle hub 38 fixed to the proximal end of the inner needle 14, there is no possibility that the inner needle 14 may wobble with respect to the puncture operation section 48. is unlikely to occur. Therefore, by holding the puncture operation section 48 and performing the puncture, the inner needle 14 can be controlled with high accuracy, making it easier to achieve accurate puncturing.

Moreover, since the puncture operation section 48 extends further to the distal end side than the conventional inner needle hub, puncturing can be performed by holding the inner needle 14 side at a position closer to the tip of the inner needle 14. Can be done. Therefore, it becomes easier to adjust the puncture position of the inner needle 14 with higher precision, and accurate puncture can be easily performed. In particular, since the puncture operation section 48 extends to the outer periphery of the outer needle hub 16, the indwelling needle assembly 10 can be held at a position close to the needle tip without holding the outer needle hub 16.

By having the puncture operation part 48 provided on the inner needle 14 side, unnecessary external force is less likely to be applied to the outer needle 12 side, and compared to when puncturing is performed by holding the outer needle hub 16, the outer needle 12 and the inner needle are Unintended relative displacement of the needle 14 is less likely to occur. Therefore, for example, by preventing the outer needle 12 from moving toward the distal end with respect to the inner needle 14 and covering the distal end of the inner needle 14 with the outer needle 12, the sharpness of the inner needle 14 can be prevented from deteriorating. This can reduce patient pain. Furthermore, it becomes easier for medical personnel to accurately control the position of the tip of the inner needle 14, making it easier to perform accurate puncture.

In particular, when an external force acts on the outer needle hub 16 provided with the soft tube 22, the outer needle 12 and the inner needle 14 are likely to move relative to each other due to the deformation of the soft tube 22. By holding the outer needle hub 16, it is difficult for external force to act on the outer needle hub 16. Therefore, relative movement of the outer needle 12 and the inner needle 14 due to deformation of the soft tube 22 is prevented, reducing puncture pain and achieving more accurate puncture.

Note that after the inner needle 14 and the outer needle 12 are punctured into the patient's blood vessel, the inner needle 14 is removed from the outer needle 12, so that the outer needle 12 and the outer needle hub 16 are inserted into the patient's blood vessel. He will be detained at

The tip of the inner needle 14 pulled out from the outer needle 12 is protected by a needle tip protector 60, as shown in FIG. That is, when the inner needle 14 is pulled out toward the proximal end, the inner needle 14 is displaced toward the proximal end relative to the protector housing 54 that is locked to the connector cap 66. Then, the distal end of the inner needle 14 moves closer to the proximal end side than the shielding member 64, allowing the shielding member 64 to move closer to the fixed member 62, and the shielding member 64 closes the distal end side of the inner needle 14. It is arranged like this. As a result, movement of the inner needle 14 toward the distal end side with respect to the needle tip protector 60 is restricted, and the needle tip of the inner needle 14 housed in the protector housing 54 is not exposed to the outside.

Furthermore, a protrusion (not shown) provided on the inner needle 14 is axially locked to the proximal end of the accommodating cylindrical portion 56 of the protector housing 54, so that a pulling force is applied from the inner needle 14 to the protector housing 54. communicated. Then, by pulling the protector housing 54 toward the proximal end with respect to the connector cap 66, the lock between the protector housing 54 and the locking claw 78 of the connector cap 66 is released, and the protector housing 54 is removed from the connector cap 66. To separate. As a result, the inner needle 14 is separated from the outer needle 12 and removed.

The outer needle 12 that is placed separately from the inner needle 14 has the connector cap 66 removed from the outer needle hub 16 (see FIG. 6), and the outer needle 12 is connected to the external threaded portion 34 provided in the flow path connection portion 20 of the outer needle hub 16. A tube or syringe connector (not shown) constituting an external flow path is attached to the tube. Thereby, the inner cavities of the outer needle 12 and the outer needle hub 16 are connected to the external flow path. In this manner, the male threaded portion 34 of the outer needle hub 16 is used both to connect the connector cap 66 to the outer needle hub 16 and to connect the external flow path to the outer needle hub 16.

When an external channel (not shown) is connected to the outer needle hub 16, the pusher 28 is pushed toward the distal end side by the external channel. The pushed pusher 28 is pressed against the hemostasis valve 26 and deforms the hemostasis valve 26, thereby opening the notch 35 of the hemostasis valve 26. Thereby, the patient's blood vessels and the external flow path are connected through the inner cavities of the outer needle 12 and the outer needle hub 16, and treatments such as hemodialysis, blood sampling, and administration of medical solutions can be performed.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the specific description. For example, the position of the distal end of the puncture operation section is not particularly limited as long as it is located on the distal side of the proximal end of the flow path connection section and on the outer periphery of the outer needle hub. Specifically, for example, the tip of the puncture operation part may be located on the outer periphery of the flow path connection part without reaching the soft tube, or the tip of the puncture operation part may be located on the outer periphery of the needle joint provided on the distal end side of the soft tube. It may be located in

The puncture operation section does not need to be formed integrally with the inner needle hub, and may be, for example, a separate member from the inner needle hub and fixedly attached to the inner needle hub. Note that the puncture operation section may be detachably attached to the inner needle hub.

The puncture operation section is not limited to a cylindrical shape, but may be, for example, a pair of plate shapes facing each other in the direction perpendicular to the axis. Further, the puncture operation section may have a tapered shape that expands or contracts toward the distal end, for example. If the puncture operation section has a shape that gradually increases in diameter toward the distal end, force in the puncturing direction can be efficiently applied during puncturing. If the puncture operation section has a shape that gradually or stepwise becomes smaller in diameter toward the distal end, even if the puncture operation section located on the outer periphery of the outer needle hub extends further toward the distal end, the puncture operation section This makes it difficult for the patient to touch the patient and hinders the puncture work.

In the embodiment described above, a pair of support surfaces 50, 50 having a planar shape is illustrated, but for example, a pair of concave surfaces concave toward the outer periphery may also be employed as the pair of support surfaces. According to this, it is possible to more effectively prevent the finger holding the pricking operation section from slipping. Further, the anti-slip surface of the support surface is not limited to a protrusion-like shape, and may be sufficient as long as it can prevent fingers from slipping. Specifically, for example, it may be in the shape of a groove, or it may be in the shape of a grain in which many fine irregularities are formed. The support surface is a surface that indicates to the user that it is a part to be held with a fingertip, and the support surface can be configured by a shape as described above, but is not limited to this, for example, a puncture operation part. A support surface can also be configured by adding marks or the like to the surface.

The support surfaces that a medical worker holds with their fingertips are not necessarily limited to just one pair. Specifically, for example, in addition to the pair of support surfaces 50, 50 provided on the side surfaces of the puncture operation section 48, a support surface may be provided on the upper surface of the puncture operation section 48. Note that, for example, by making the puncture operation section 48 have a substantially rectangular cross section, three surfaces excluding the surface located on the patient's body surface side can be respectively used as support surfaces. As can be seen from this, when a medical worker holds the puncture operation section 48 with his fingertips, there are no particular limitations on how he holds it. For example, it is also possible to hold the puncturing part 48 by placing the thumb and middle finger on a pair of support surfaces 50, 50 provided on the sides of the puncturing part 48, and by placing the index finger on the top surface of the puncturing part 48.

The hemostasis valve 26, pusher 28, protector accommodating portion 44, protector housing 54, needle tip protector 60, connector cap 66, etc. shown in the embodiment are provided as necessary, and none of them are essential. .

10 Indwelling needle assembly 12 Outer needle 14 Inner needle 16 Outer needle hub 18 Needle joint 20 Channel connection section 22 Soft tube 24 Valve housing 26 Hemostasis valve 28 Pusher 30 Cover member 32 Pusher guide 34 External thread portion 35 Notch 36 Valve Support member 37 Tube connecting member 38 Inner needle hub 40 Pedestal part 42 Connecting part 44 Protector accommodating part 46 Inner needle cap 48 Puncture operation part 50 Support surface 52 Anti-slip 54 Protector housing 56 Accommodating cylinder part 58 Lid body 60 Needle tip protector 62 Fixed Member 64 Shielding member 66 Connector cap 68 Bottom wall 70 Tubular projection 72 Circumferential wall 74 Elastic piece 76 Female thread 78 Locking claw

Claims (4)

In an indwelling needle assembly in which an inner needle having an inner needle hub on the proximal end side is removably inserted into an outer needle having an outer needle hub on the proximal end side,
The outer needle hub includes a needle joint portion to which the outer needle is fixed, a flow path connection portion connected to an external flow path, and a soft tube connecting the needle joint portion and the flow path connection portion. ,
The inner needle hub is provided with a puncturing operation portion extending toward the distal end, and the puncturing operation portion is provided on the outer periphery of the flow path connection portion without being connected to the needle joint portion and without covering the outer needle. The indwelling needle assembly extends out. The indwelling needle assembly according to claim 1, wherein the puncture operation section extends around the outer periphery of the soft tube. The indwelling needle assembly according to claim 1 or 2, wherein the puncture operation section is cylindrical. The indwelling needle assembly according to any one of claims 1 to 3, wherein the outer surface of the puncture operation section is provided with a pair of support surfaces that are supported by fingers.

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