JP3170612U - Indwelling needle assembly - Google Patents

Abstract

An indwelling needle assembly capable of easily attaching and detaching a needle base to and from a catheter hub is provided. A distal end of an inner needle 9 having a proximal end attached to the distal end side of a needle base 8 is inserted into a catheter hub 2 having a proximal end of a catheter 3 attached to the distal end side so as to protrude from the distal end of the catheter 3. In the indwelling needle assembly 1, the internal thread portion 21 is provided at the proximal end portion of the catheter hub 2, and the engagement piece 132 protruding toward the internal thread portion 21 side is provided at the distal end portion of the needle base 8. The male screw part 133 that engages with the female screw part 21 is provided. [Selection] Figure 3

Description

  The present invention relates to an indwelling needle assembly used to connect a catheter and a human blood vessel.

  A catheter is used as a device for performing hemodialysis, infusion, blood transfusion or the like for treatment, and an indwelling needle assembly is used to connect the catheter to a blood vessel of a human body.

  This indwelling needle assembly was inserted into a catheter hub with the proximal end of the catheter attached to the distal end side so that the distal end of the inner needle attached to the distal end side of the needle base protruded from the distal end of the catheter. It is configured.

  When this indwelling needle assembly is punctured (pierced) into a human body or the like, if the needle base is grasped and punctured, the inner needle and the distal end side of the catheter can be punctured even if there is puncture resistance.

  However, when the catheter bubbling is grasped and punctured, the inner needle moves (retreats) to the proximal side of the catheter due to puncture resistance, so that the distal end of the inner needle and the catheter can be punctured. become unable.

  In view of this, an indwelling needle assembly has been proposed that includes a locking mechanism so that the inner needle does not move backward in the catheter due to puncture resistance even when the catheter bubbling is performed (for example, Patent Document 1). reference.).

JP 2001-218852 A

  In the indwelling needle assembly including the locking mechanism described in Patent Document 1 described above, it is complicated to attach / detach the needle base to / from the catheter hub or to attach the locking mechanism.

  The present invention has been made to solve the above-described disadvantages, and provides an indwelling needle assembly that can easily attach and detach a needle base to and from a catheter hub.

  (1) In this device, a distal end of an inner needle having a proximal end attached to the distal end side of a needle base is inserted into a catheter hub having a proximal end attached to the distal end side so as to protrude from the distal end of the catheter. In the indwelling needle assembly, a locking portion is provided on one of the distal end portion of the needle base and the proximal end portion of the catheter hub, and on the other of the distal end portion of the needle base and the proximal end portion of the catheter hub, An engagement piece that protrudes toward the engagement portion is provided, and an engagement portion that engages with the engagement portion is provided on the engagement piece.

  (2) This device is characterized in that, in the indwelling needle assembly according to (1), at least one of the locking portion and the engagement piece is formed of an elastic body.

  (3) This device is characterized in that, in the indwelling needle assembly according to (1) or (2), the locking portion and the engaging portion are constituted by a female screw portion and a male screw portion.

  (4) This device is characterized in that, in the indwelling needle assembly according to (3), the non-engaged portion side of the thread that does not engage with the female screw portion of the male screw portion is chamfered to be a guide surface. And

  (5) This device is the indwelling needle assembly according to any one of (1) to (4), wherein a blade surface located at a tip of the inner needle is disposed on the engagement piece side. It is characterized by that.

  This device is the indwelling needle assembly according to any one of (1) to (5), wherein the needle base and the inner needle are accommodated in a state where the needle base is moved to the proximal end side. A feature is provided.

According to this device, since the needle base and the catheter hub are engaged with each other by the locking portion and the engaging portion, even if the catheter bubbling is grasped and punctured, the inner needle is moved into the catheter by the puncture resistance. Is not moved (retracted) toward the proximal end, and the inner needle is not moved (retracted) through the catheter toward the proximal end during transportation.
Then, the engaging portion can be assembled by engaging the engaging portion with the engaging portion, and the inner needle can be extracted from the catheter by detaching the engaging portion from the engaging portion. It can be easily attached and detached.

  In addition, since at least one of the locking portion and the engagement piece is made of an elastic body, the engagement piece is pressed toward the locking portion (in the axial direction of the locking portion) to elastically deform the engagement piece. Accordingly, the needle base can be attached to the catheter hub so that the engaging portion can get over the locking portion, and the engaging piece can be elastically deformed by tilting the needle base with respect to the catheter hub to lock the engaging portion. Since the inner needle can be removed from the catheter by releasing the engagement with the portion, the needle base can be easily attached to and detached from the catheter hub.

  Further, since the locking portion and the engaging portion are constituted by the female screw portion and the male screw portion, the needle base can be attached to the catheter hub by screwing the male screw portion with the female screw portion, and the male screw portion and the female screw portion. Since the inner needle can be removed from the catheter by releasing the screw engagement, the needle base can be easily attached to and detached from the catheter hub.

Further, since the non-engagement part side of the thread that does not engage with the female thread part of the male thread part is chamfered to be a guide surface, the male thread part is pressed toward the female thread part side (in the axial direction of the female thread part) to engage pieces. By elastically deforming, the male screw part is guided by the guide surface and gets over the female screw part, so that the assembly can be performed smoothly.
Since the male screw portion is engaged with the female screw portion with a normal screw thread in the direction in which the male screw portion is detached from the female screw portion, the needle base does not accidentally come out of the catheter hub.

  In addition, since the blade surface located at the tip of the inner needle is disposed on the engagement piece side, the direction of the blade surface of the inner needle can be easily confirmed.

  In addition, since the accommodating portion for accommodating the needle base and the inner needle is provided in a state in which the needle base is moved to the proximal end side, it is possible to prevent accidents such as erroneous piercing with the used inner needle.

It is a top view which shows the indwelling needle assembly which is one Example of this device. It is a side view of the indwelling needle assembly shown in FIG. FIG. 2 is a partial plan sectional view of the indwelling needle assembly shown in FIG. 1. It is explanatory drawing which shows the structure of a locking mechanism, and a locked state. It is explanatory drawing which shows the lock release state of a locking mechanism. It is explanatory drawing which shows the form of a latching | locking part and an engaging part. It is explanatory drawing of an example which makes an engaging part engage an engaging part, or cancels engagement with an engaging part and an engaging part. FIG. 4 is a partial cross-sectional view corresponding to FIG. 3 in a state in which the inner needle is moved (retracted) and accommodated in the accommodating portion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a plan view showing an indwelling needle assembly according to an embodiment of the present invention, FIG. 2 is a side view of the indwelling needle assembly shown in FIG. 1, and FIG. 3 is a portion of the indwelling needle assembly shown in FIG. FIG. 4 is an explanatory diagram showing the configuration of the lock mechanism, the locked state, FIG. 5 is an explanatory diagram showing the unlocked state of the lock mechanism, and FIG. 6 is an explanatory diagram showing the form of the locking portion and the engaging portion. 7 is an explanatory diagram of an example of engaging the engaging portion with the engaging portion or releasing the engagement between the engaging portion and the engaging portion, and FIG. 8 is accommodated by moving (retracting) the inner needle. FIG. 4 is a partial cross-sectional view corresponding to FIG. 3 in a state of being housed in a part.

  1 to 3, the indwelling needle assembly 1 of the present invention has a tubular catheter hub 2 made of, for example, polyvinyl chloride, and the distal end side of the catheter hub 2 (the left side in FIG. The same applies to the following, and the base end side (the left side in FIG. 3; the same applies to the following) is attached to the tube 3, for example, a fluororesin catheter 3, and the catheter 3 is inserted from the distal end side of the catheter hub 2. The wing member 4 attached to the catheter hub 2, the hemostasis valve 5 made of, for example, isopropylene rubber accommodated in the catheter hub 3, and the cylinder that is opened when the hemostasis valve 5 is pushed from the proximal end side. For example, a pusher 6 made of polypropylene, a coil spring 7 as an elastic body that pulls the pusher 6 away from the hemostasis valve 5 so as to close the hemostasis valve 5, and a cylindrical shape, For example, the needle base 8 made of polycarbonate, the inner needle 9 press-fitted into the needle base 8 from the distal end side to the proximal end side, and the air attached to the proximal end of the needle base 8 are allowed to pass through the liquid (blood ), The needle base 8, the inner needle 9 and the housing for housing the filter 10, the screw 13 attached to the housing, and the lock mechanism, for example, a press made of polyoxymethylene The button 14 and a coil spring 15 as an elastic body that urges the needle base 8 and the inner needle 9 to be accommodated in the accommodating portion.

  The indwelling needle assembly 1 of the present invention is preferably transparent or translucent so that flashback (backflow of blood) can be confirmed.

  The above-described catheter hub 2 is provided with a female screw portion 21 as a locking portion on the outer periphery on the proximal end side, and a chamfered portion 22 (see FIG. 3) whose inner periphery on the proximal end side expands toward the proximal end side. Is provided.

  The above-described wing member 4 is made of, for example, polyvinyl chloride, and a tubular portion 41 through which the catheter hub 2 and the catheter 3 are inserted, and the tubular portion 41 in a direction perpendicular to the axis of the tubular portion 41. Two wings 42 </ b> A and 42 </ b> B that can be bent with respect to 41 are provided.

  The inner needle 9 described above is made of metal and has a blade surface 91 at the tip.

  The above-described housing portion is made of, for example, a cylindrical cover 11 made of polycarbonate and the same polycarbonate as the cover 11 attached to the base end of the cover 11 so as to close the base end side of the cover 11. It is comprised with the bottomed cylindrical housing 12 made.

  A small-diameter cylindrical portion 111 that protrudes toward the distal end is provided at the distal end portion of the cover 11, and a protrusion (rib) (not shown) is provided on the outer periphery of the small-diameter cylindrical portion 111 as a detent for the screw 13 extending in the axial direction. ) Is provided.

  The screw 13 described above is made of an elastic resin, for example, polypropylene (PP), polycarbonate (PC), polyvinyl chloride (PVC), polyethylene (PE), polyacetal (POM), and the like. 111, a fitting tube portion 131 into which the fitting member 111 is press-fitted, an engagement piece 132 projecting from the part of the outer periphery of the attachment tube portion 131 to the distal end side by a predetermined length, and an inner peripheral surface of the engagement piece 132 (catheter hub 2 The male threaded portion 133 is provided on the surface facing the female threaded portion 21 as an engaging portion that is screwed with the female threaded portion 21 of the catheter hub 2.

  As shown in FIG. 6, the screw thread of the male screw part 133 is chamfered to form a guide surface 134 by chamfering the non-engagement part side of the screw thread that does not engage with the female screw part 21 of the catheter hub 2.

  In addition, seeing the internal thread part 21 (locking part), the engagement piece 132, and the external thread part (engagement part) from the left side of FIGS. 1 to 3, counterclockwise with respect to the blade surface 91 of the inner needle 9. The position of the internal thread portion 21 (locking portion), the engagement piece 132, and the external thread portion (engagement portion) is the inner needle as viewed from the left side of FIGS. Although it may be positioned at any position with respect to the nine blade surfaces 91, it is desirable to be positioned at the same position as the blade surface 91 of the inner needle 9.

  The lock mechanism described above is configured as follows.

  As shown in FIG. 4C, the outer circumference of the intermediate portion in the longitudinal direction of the needle base 8 (the portion where the push button 14 is engaged and the portion closer to the base end than the portion where the coil spring 15 is provided) Cutouts 81A and 81B that form a two-surface width are provided.

Further, the engaging portion of the push button 14 with the needle base 8 is provided with an arcuate protrusion 142 having a width slightly larger than the two surface widths of the notches 81A and 81B, as shown in FIG. 4B. A through-hole 141 is formed.
The through-hole 141 has a circular shape other than the arcuate protrusion 142.

  Next, an example of the operation when the inner needle 9 of the indwelling needle assembly 1 is inserted (assembled) into the catheter 3 will be described.

  The catheter hub 2, the catheter 3, the wing member 4, the hemostasis valve 5, the pusher 6 and the coil spring 7 are assembled together as shown in FIG. 3, and the needle base 8, the inner needle 9, the filter 10, and the cover 11 are assembled. It is assumed that the housing 12, the screw 13, the push button 14, and the coil spring 15 are integrally assembled as shown in FIG.

  In this state, as shown in FIG. 3, when the inner needle 9 is inserted into the catheter hub 2 so as to penetrate the pusher 6, the hemostasis valve 5 and the catheter 3, the female screw portion 21 and the male screw portion 133 are shown in FIG. After confronting as shown, the male screw part 133 abuts on the female screw part 21 as shown in FIG.

  When the inner needle 9 is further inserted into the catheter hub 2 in the state shown in FIG. 7 (a), the male threaded portion 133 is guided by the guide surface 134, and the engaging piece 132 is bent outward so that the female threaded portion 21 is shown. As shown in FIG. 7B, the needle base 8 can be attached to the catheter hub 2 by getting over and engaging with the female screw portion 21, and can be assembled as shown in FIGS.

  The needle base 8 may be attached to the catheter hub 2 by rotating the needle base 8 side while inserting the inner needle 9 into the catheter hub 2 and screwing the female screw portion 21 into the male screw portion 133.

  Next, the operation when using the indwelling needle assembly 1 will be described.

  Before use, it is assumed that the inner needle 9 protrudes from the distal end of the catheter 3 and is covered with a catheter inner needle cover (not shown) as shown in FIGS.

  In this state, the catheter inner needle cover is removed, the two wings 42A and 42B are bent and gripped inward, the inner needle 9 is punctured into the skin, and the distal end of the inner needle 9 and the distal end of the catheter 3 enter the blood vessel. To be located.

  In this way, blood flows backward from the inside of the inner needle 9 to the space of the needle base 8.

  Thus, if it can confirm that the blood flows backward, for example, the catheter 3 will be advanced to the required depth.

Subsequently, the inner needle 9 is housed inside the housing portion as shown in FIG. 8 while the push button 14 is pushed and the catheter 3 remains.
By this accommodation, the inner needle 9 is extracted from the skin.

  Next, an example of the operation when removing the needle base 8 from the catheter hub 2 will be described.

  In the state shown in FIG. 8, the holding portion (cover 11 or housing 12) is gripped, and the engagement piece 132 is bent with respect to the catheter hub 2 with respect to the needle base 8 as shown in FIG. 7C. When the rotation is made, the engagement piece 132 is bent to disengage the male screw portion 133 from the female screw portion 21, so that the needle base 8 can be removed from the catheter hub 2.

According to one embodiment of the present invention, the needle base 8 and the catheter hub 2 are engaged with each other by the engaging portion (female screw portion 21) and the engaging portion (male screw portion 133). Even if puncture is performed, the inner needle 9 does not move (retreat) to the proximal end side in the catheter 3 due to puncture resistance, and the inner needle 9 moves (retracts) to the proximal end side in the catheter 3 during transportation. No longer.
And it can assemble by engaging an engaging part (male screw part 133) with a locking part (female screw part 21), and makes an engaging part (male screw part 133) detach from a locking part (female screw part 21). As a result, the inner needle 9 can be removed from the catheter 3, so that the needle base 8 can be easily attached to and detached from the catheter hub 2.

  Further, since the engaging piece 132 is made of an elastic body, the engaging portion (male screw portion 133) is pressed toward the locking portion (female screw portion 21) side (the axial direction of the locking portion (female screw portion 21)). By elastically deforming the engagement piece 132, the needle base 8 can be attached to the catheter hub 2 so that the engagement portion (male screw portion 133) can get over the locking portion (female screw portion 21). The inner needle 9 is moved from the catheter 3 by inclining the engagement piece 132 by being inclined with respect to the hub 2 and releasing the engagement between the engagement portion (male screw portion 133) and the locking portion (female screw portion 21). Since it can be extracted, the needle base 8 can be easily attached to and detached from the catheter hub 2.

  Further, since the locking portion and the engaging portion are constituted by the female screw portion 21 and the male screw portion 133, the needle base 8 can be attached to the catheter hub 2 by screwing the male screw portion 133 to the female screw portion 21. Since the inner needle 9 can be extracted from the catheter 3 by releasing the threaded engagement between the male screw portion 133 and the female screw portion 21, the needle base 8 can be easily attached to and detached from the catheter hub 2.

Further, since the non-engagement portion side of the screw thread that does not engage with the female screw portion 21 of the male screw portion 133 is chamfered to be the guide surface 134, the male screw portion 133 is moved to the female screw portion 21 side (the axial direction of the female screw portion 21). By pressing and elastically deforming the engagement piece 132, the male threaded portion 133 is guided by the guide surface 134 and gets over the female threaded portion 21, so that the assembly can be performed smoothly.
Since the male screw portion 133 is engaged with the female screw portion 21 with a normal screw thread in the direction in which the male screw portion 133 is detached from the female screw portion 21, the needle base 8 is not inadvertently pulled out from the catheter hub 2.

  Moreover, since the blade surface 91 located at the tip of the inner needle 9 is arranged so as to be on the engagement piece 132 side, the direction of the blade surface 91 of the inner needle 9 can be easily confirmed.

In addition, since the accommodating portion for accommodating the needle base 8 and the inner needle 9 is provided in a state in which the needle base 8 is moved to the proximal end side, it is possible to prevent accidents such as erroneous piercing with the used inner needle 9. Can do.
Further, in a state where the inner needle 9 is accommodated in the accommodating portion and the inner needle 9 is not inserted into the catheter hub 2, the needle base 8 can be easily rotated to bend the engagement piece 132 with respect to the catheter hub 2. Thus, the needle base 8 can be easily detached from the catheter hub 2.

  Further, since the chamfered portion 22 is provided on the inner periphery on the proximal end side of the catheter hub 2, when removing the needle base 8 from the catheter hub 2 by tilting the accommodating portion (needle base 8) toward the engagement piece 132 side, Since the distal end portion of the base 8 does not collide with the catheter hub 2, the needle base 8 can be removed smoothly.

  Moreover, since the protrusion (rib) was provided in the outer periphery of the small diameter cylinder part 111 of the cover 11, it can prevent that the screw 13 rotates to the circumferential direction of the cover 11. FIG.

In the above-described embodiment, an example in which the wing member 4 is provided is shown, but the wing member 4 may not be provided.
Moreover, although the example which made the screw 13 the cover 11 (accommodating part) separate is shown, you may comprise the screw 13 integrally with the cover 11 (accommodating part).
Moreover, although the example which has arrange | positioned the cover 11 (accommodating part) between the needle base 8 and the screw 13 was shown, the needle base 8 is provided with the screw 13 or the needle base 8 and the screw 13 are configured integrally. The thing of the structure which does not provide an accommodating part may be sufficient.
In addition, although the example in which the locking portion is the female screw portion 21 and the engaging portion is the male screw portion 133 has been shown, a protrusion (rib) that goes around the locking portion is used, and the engaging portion is related to the protrusion (rib). It is good also as a protrusion to match | combine, or it is good also as a complementary engaging part like a recessed part and a convex part for a latching | locking part and an engaging part.
Moreover, although the locking part (internal thread part 21) was provided in the catheter hub 2 and the engaging part (internal thread part 133) was provided in the needle base 8 side, the engaging part (internal thread part) was shown in the needle base 8 as an example. It is good also as a structure provided in the side and providing an engaging part (male thread part) in the catheter hub 2. FIG.
In addition, although an example in which only the engagement piece 132 (screw 13) is formed (configured) with an elastic body has been shown, the catheter hub 2 is formed (configured) with an elastic body, or the catheter hub 2 and the engagement piece 132 (screw) 13) may be formed (configured) of an elastic body.
Moreover, although the example which provides a protrusion (rib) in the outer periphery of the small diameter cylinder part 111 of the cover 11 and prevents the screw 13 from rotating was shown, a rotation stopper (protrusion) is the inside of the attachment cylinder part 131 of the screw 13. You may provide in a surrounding surface to an axial direction.

DESCRIPTION OF SYMBOLS 1 Indwelling needle assembly 2 Catheter hub 21 Female thread part (locking part)
22 chamfered portion 3 catheter 4 wing member 41 tube portion 42A wing 42B wing 5 hemostatic valve 6 pusher 7 coil spring 8 needle base 81A notch 81B notch 9 inner needle 91 blade surface 10 filter 11 cover (accommodating portion)
111 Small-diameter cylindrical part 12 Housing (accommodating part)
13 Screw 131 Mounting cylinder part 132 Engagement piece (elastic body)
133 Male thread (engagement part)
134 Guide surface 14 Push button 141 Through hole 142 Arc-shaped protrusion 15 Coil spring

Claims (6)

In an indwelling needle assembly that is inserted into a catheter hub in which the proximal end side of the catheter is attached to the distal end side so that the distal end of the inner needle attached to the distal end side of the needle base protrudes from the distal end of the catheter.
A locking portion is provided on one of the distal end portion of the needle base and the proximal end portion of the catheter hub,
On the other of the distal end portion of the needle base and the proximal end portion of the catheter hub, an engagement piece that protrudes toward the locking portion side is provided,
The engaging piece is provided with an engaging portion that engages with the locking portion.
An indwelling needle assembly characterized by that. The indwelling needle assembly according to claim 1,
At least one of the locking portion and the engagement piece is formed of an elastic body.
An indwelling needle assembly characterized by that. The indwelling needle assembly according to claim 1 or 2,
The locking portion and the engaging portion are composed of a female screw portion and a male screw portion,
An indwelling needle assembly characterized by that. The indwelling needle assembly according to claim 3,
The non-engagement part side of the thread that does not engage with the female thread part of the male thread part is chamfered to be a guide surface.
An indwelling needle assembly characterized by that. The indwelling needle assembly according to any one of claims 1 to 4,
The blade surface located at the tip of the inner needle is arranged to be on the engagement piece side,
An indwelling needle assembly characterized by that. The indwelling needle assembly according to any one of claims 1 to 5,
In a state where the needle base is moved to the proximal end side, an accommodation portion for accommodating the needle base and the inner needle is provided.
An indwelling needle assembly characterized by that.

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