WO2021006104A1

WO2021006104A1 - Indwelling needle assembly

Info

Publication number: WO2021006104A1
Application number: PCT/JP2020/025585
Authority: WO
Inventors: 拓弥八島; 大輔中川
Original assignee: 株式会社トップ
Priority date: 2019-07-05
Filing date: 2020-06-29
Publication date: 2021-01-14
Also published as: JPWO2021006104A1; TW202108199A

Abstract

Provided is an indwelling needle assembly which is easy to handle. An indwelling needle assembly 1 is provided with: a tubular outer needle 10; an outer needle base 20 to which the base end part of the outer needle 10 is fixed; an inner needle 30 which is inserted in the outer needle 10 and the outer needle base 20; an inner needle base 40 to which the base end part of the inner needle 30 is fixed; a housing 50 that detachably holds the outer needle base 20 and that holds the inner needle base 40 so as to be movable in the axial direction of the inner needle 30; a switch member 70 that is disposed in the housing 50 so as to be movable between a restriction position at which movement of the inner needle base 40 is restricted and a release position at which the restriction of movement of the inner needle base 40 is released; and a protector 80 that is disposed so as to cover the outer needle 10 and the inner needle 30 and that has an engagement part 82 for restricting the movement of the switching member 70 from the restriction position to the release position by engaging with a portion of the switch member 70.

Description

Indwelling needle assembly

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.

Conventionally, an inner needle is inserted into an outer needle (catheter) in advance, guided by the inner needle, the outer needle is inserted into a blood vessel of a living body, the inner needle is removed, and an infusion line is inserted into the indwelled outer needle. There are known indwelling needles for connecting such as. In recent years, in particular, an indwelling needle assembly capable of accommodating an inner needle in a housing by a coil spring or the like after removal has become widespread in order to prevent virus infection or the like caused by touching the inner needle after removal (for example). , Patent Document 1).

In such an indwelling needle, the sharp tip of the inner needle protruding from the tip of the outer needle is punctured into the living body to reach the inside of a blood vessel or the like, and then the outer needle and the outer needle base are further pushed along the inner needle. As a result, the tip of the outer needle is inserted deeply inside the blood vessel or the like. Therefore, such an indwelling needle is generally provided with a protector (cover) that covers and protects the inner needle and the outer needle because the inner needle and the outer needle are projected in the state before use. Normally, this protector also covers the switch member that is operated when the user accommodates the inner needle in the housing, and the switch member cannot be operated with the protector attached. This prevents the indwelling needle assembly from becoming unusable due to the switch member touching something during transportation or storage, for example, and the inner needle being housed in the housing before use. There is.

JP-A-2007-296022

However, the indwelling needle assembly described in Patent Document 1 has a problem that the protector merely covers the switch member, and the switch member is always in an operable state. Therefore, the switch member may operate due to impact, vibration, or the like without touching the switch member, and care may be required in handling the indwelling needle assembly.

In view of such circumstances, the present invention intends to provide an indwelling needle assembly that is easy to handle.

The indwelling needle assembly according to the present invention includes a tubular outer needle, an outer needle base to which the base end portion of the outer needle is fixed, the outer needle, an inner needle inserted into the outer needle base, and the above. An inner needle base to which the base end portion of the inner needle is fixed, a housing that holds the outer needle base detachably and movably the inner needle base in the axial direction of the inner needle, and the housing. The switch member is movably arranged between the restricted position for restricting the movement of the inner needle base and the release position for releasing the restriction on the movement of the inner needle base, and covers the outer needle and the inner needle. It is characterized by including a protector having an engaging portion that is arranged and engages with a part of the switch member to restrict the movement of the switch member from the restricted position to the release position.

According to the present invention, by engaging the engaging portion with the switch member, it is possible to prevent the switch member from operating while the protector is attached. This makes it possible to facilitate the handling of the indwelling needle assembly.

Further, in the present invention, the switch member is arranged so as to move from the restricted position to the release position by moving in a direction intersecting the axial direction of the inner needle, and the engaging portion is the inner needle. It is preferably composed of a protrusion that is continuous in the axial direction of the inner needle or protrudes in the axial direction of the inner needle, or a recess that is continuous in the axial direction of the inner needle or is recessed in the axial direction of the inner needle.

According to this, the engaging portion can be easily engaged with the switch member simply by moving the protector in the axial direction of the inner needle and attaching it to the housing. In addition, the engaging portion functions as a guide when removing the protector, so that the protector can be smoothly removed when using the indwelling needle assembly.

Further, in the present invention, the switch member has an exposed portion that is exposed from the housing and is covered with the protector, and the top surface of the exposed portion on the tip end side of the inner needle is the tip end side of the inner needle. It is preferable that the shape has an inclined surface gradually approaching the housing.

According to this, when the protector is removed when the indwelling needle assembly is used, the exposed portion of the switch member is pressed by the opening edge of the protector, and it is possible to prevent the switch member from operating.

Further, in the present invention, it is preferable that the protector has a tilt reducing portion that reduces its own tilt by coming into contact with the outer needle group.

According to this, the inclination of the protector can be reduced by contacting the inclination reducing portion with the outer needle base, so that the degree of freedom in the shape of the housing, particularly the shape of the portion holding the outer needle base is increased. , The housing can be shaped to have excellent operability.

Further, in the present invention, one of the housing and the switch member has a one-side locking portion, and the other of the housing and the switch member is locked to the one-side locking portion. It is preferable that the one-side locking portion has a stop portion and is provided at a position where the other-side locking portion locks when the switch member is in the restricted position.

According to this, it is possible to prevent the switch member from easily operating even after the protector is removed, so that the indwelling needle assembly 1 can be easily handled.

Further, in the present invention, the one-side locking portion is a position in which the other-side locking portion is locked when the switch member is in the restricted position, and the switch member is in the releasing position. It is preferable that the other side locking portion is provided at each locking position.

According to this, it is possible to generate a click feeling when the switch member reaches the release position, so that the user can easily determine that the switch member has reached the release position only by the distance between the fingertips. Can be done.

Further, in the present invention, the one-side locking portion or the other-side locking portion is located at the released position from the restricted position when the switch member moves from the restricted position to the released position. It is preferable that the shape is such that the locking is easier to release than when moving toward the opposite side.

The switch member may come off the housing by moving from the regulated position to the opposite side of the release position, but according to this, the switch member has good operability due to an appropriate click feeling and an appropriate pressing force. And, it is possible to achieve both reliable prevention of the switch member from coming off.

Further, in the present invention, it is preferable to include an elastic member that elastically deforms as the switch member moves from the regulated position to the released position and urges the switch member toward the regulated position.

According to this, when the switch member moves slightly, the switch member can be pushed back to the regulated position, so that the operation of the switch member after the protector is removed can be further suppressed. Further, by imparting an appropriate resistance to the movement of the switch member, the operability of the switch member can be adjusted and the operability can be improved.

According to the indwelling needle assembly according to the present invention, it is possible to obtain an excellent effect that handling can be facilitated.

It is external perspective view which showed by disassembling a part of the indwelling needle assembly which concerns on one Embodiment of this invention. FIG. 1 is a cross-sectional view taken along the line II in FIG. It is an external perspective view which showed a part of the tip side of a base member. It is an external perspective view of a switch member. FIG. 2 is a sectional view taken along line II-II of FIG. It is sectional drawing which showed the state which the inner needle was housed in a housing. It is a figure which showed the modification of the switch member. It is a figure which showed the appearance and the inside of a protector. It is a figure which showed the modification of the protector 80. It is a figure which showed the modification of the inner needle base. It is a figure which showed the modification of the inner needle base. It is a figure which showed the modification of the housing. It is a figure which showed the modification of the housing.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an external perspective view showing a part of the indwelling needle assembly 1 according to the embodiment of the present invention in an exploded manner. 2A is a sectional view taken along line II in FIG. 1, and FIG. 2B is an enlarged sectional view showing a part of FIG. 2A.

As shown in these figures, the indwelling needle assembly 1 has an outer needle (catheter) 10 inserted into a blood vessel or the like of a living body and indwelled, and an outer needle base (catheter) fixed to the proximal end of the outer needle 10. The hub) 20, the inner needle 30 inserted into the outer needle 10 and the outer needle base 20, the inner needle base 40 fixed to the base end portion of the inner needle 30, and the outer needle base 20 are held at one end. A housing 50 that accommodates the inner needle base 40 so as to be movable in the axial direction of the inner needle 30, an urging member 60 arranged in the housing 50 so as to cover the outer periphery of the inner needle base 40, and the inner needle 30. It includes a switch member 70 arranged in the housing 50 so as to be movable in a direction perpendicular to the axial direction.

The indwelling needle assembly 1 also includes a protector 80 that is attached to the housing 50 so as to cover the outer needle 10, the outer needle base 20, the inner needle 30, a part of the housing 50, and the switch member 70, and is removed during use. ing. Note that FIGS. 1 and 2B show a state in which the protector 80 is removed, and FIG. 2A shows a state in which the protector 80 is attached to the housing 50.

The indwelling needle assembly 1 is configured with reference to the axial direction of the inner needle 30, and includes the entire indwelling needle assembly 1, the outer needle 10, the outer needle base 20, the inner needle 30, the inner needle base 40, and the housing 50. The axial direction of the protector 80 and the protector 80 substantially coincide with the axial direction of the inner needle 30, and the same applies to the circumferential direction. Therefore, in the following description, the left-right direction in FIGS. 2A and 2B is the axial direction, the left side is the tip side, and the right side is the base end side. Further, the indwelling needle assembly 1 is usually used in a posture in which the lower side in FIGS. 1 and 2A and 2B is the living body side, that is, the puncture target side of the inner needle 30 and the outer needle 10.

The outer needle 10 is a tubular member whose tip is formed in a tapered shape, and is made of an appropriate resin having flexibility. The outer needle base 20 is a tubular member having a substantially truncated cone-shaped outer shape for connecting an infusion line, a syringe, or the like to the outer needle 10, and includes a luer connector of a predetermined standard. An outer needle fixing portion 21 having a reduced inner and outer diameter is provided at the tip end portion of the outer needle base 20, and the base end portion of the outer needle 10 is fixed by an adhesive or the like at the outer needle fixing portion 21.

The outer needle 10 and the outer needle base 20 are made of a transparent or translucent resin, and a user such as a doctor or a nurse confirms so-called back blood (flashback) on the outer needle 10 and the outer needle base 20. It is possible. An appropriate hemostatic valve may be provided on the outer needle base 20 to prevent the blood stored inside from leaking after the outer needle base 20 is removed from the housing 50.

The inner needle 30 is a tubular member having a blade surface formed at the tip thereof, and is made of an appropriate metal or resin having a higher rigidity than the outer needle 10. The shape of the tip of the inner needle 30 is not particularly limited, and the puncture resistance may be reduced by, for example, backcutting or lancet processing. Near the tip of the inner needle 30, a side hole 31 is provided for visualizing back blood flowing through the gap between the inner needle 30 and the outer needle 10.

That is, a part of the back blood that has flowed into the inner needle 30 from inside the blood vessel flows into the gap between the inner needle 30 and the outer needle 10 through the side hole 31, and is visually recognized through the transparent or translucent outer needle 10. It has become like. The blood that has passed between the inner needle 30 and the outer needle 10 is stored inside the outer needle base 20. The blood stored in the outer needle base 20 is also visible through the transparent or translucent outer needle base 20.

The inner needle base 40 is a substantially stepped cylindrical member for supporting the inner needle 30, and is composed of a small diameter portion 41 on the tip end side and a large diameter portion 42 on the base end side. On the outer peripheral surface of the small diameter portion 41 on the base end side, detent projections 41a for preventing the relative rotation of the inner needle base 40 and the housing 50 are provided at two places. Further, an inner needle fixing portion 41b having a reduced inner diameter is provided on the tip end side of the small diameter portion 41.

The base end portion of the inner needle 30 inserted into the small diameter portion 41 is fixed by an adhesive or the like at the inner needle fixing portion 41b. The inside of the inner needle 30 communicates with the inside of the inner needle base 40, and the blood that has passed through the inside of the inner needle base 30 flows into the inside of the inner needle base 40. The inner needle base 40 is made of a transparent or translucent resin together with the housing 50, and the user can confirm back blood even in the inner needle base 40.

The opening on the proximal end side of the large diameter portion 42 of the inner needle base 40 is closed by the filter 43 which has air permeability but does not have liquid permeability. As a result, the internal space of the inner needle base 40 constitutes a flush chamber for storing blood that has passed through the inner needle 30. The filter 43 is composed of a porous body, and appropriately discharges the air in the inner needle base 40 to promote the inflow of blood into the inner needle base 40 and is stored in the inner needle base 40. Prevents blood from leaking to the outside. The filter 43 is inserted into the large diameter portion 42 from the base end side, and is positioned at a position slightly inserted from the base end by abutting against the positioning convex portion 42a provided inside the large diameter portion 42.

The inner peripheral surface of the large diameter portion 42 on the proximal end side of the filter 43 is directed toward the proximal end side in order to facilitate attachment of the filter 43 to the inner needle base 40 (insertion into the inner needle base 40). The diameter is expanded in a tapered shape. Further, the inner peripheral surface on the proximal end side of the filter 43 constitutes an accommodating portion 44 accommodating a part of the housing 50. The details of the accommodating portion 44 will be described later. Further, a collar-shaped receiving portion 45 for receiving the urging force of the urging member 60 is provided on the outer peripheral surface of the base end side end portion of the large diameter portion 42.

The housing 50 holds each part of the indwelling needle assembly 1 and is gripped by the user. The housing 50 is formed in a bottomed tubular shape in which only the tip end side is opened by combining the base member 50a and the inner needle accommodating member 50b. Further, the axial length of the housing 50 is such that the entire inner needle 30 removed from the outer needle 10 can be accommodated together with the inner needle base 40.

The base member 50a has a hollow substantially square columnar grip portion 51, a substantially cylindrical connecting portion 52 extending from the base end side of the grip portion 51, and a substantially funnel-shaped extending from the tip end side of the grip portion 51. It is a tubular member composed of an extending portion 53 and having a through hole 54 having a circular cross section penetrating in the axial direction. The base member 50a is made of a transparent or translucent resin, and as described above, the back blood in the inner needle base 40 can be visually recognized from the outside.

The grip portion 51 is a portion for the user to grip. The grip portion 51 is configured to have an outer shape assuming a holding method (so-called horizontal holding) in which the thumb is arranged on the left side surface 51a and the middle finger is arranged on the right side surface 51b when gripping with the right hand. Specifically, the left side surface 51a and the right side surface 51b are each formed in a concave shape that gradually separates from each other toward the tip end side so that a force can be easily applied when the inner needle 30 is punctured. Further, a plurality of non-slip protrusions 51c are provided on the left side surface 51a and the right side surface 51b.

On the tip end side of the upper surface 51d of the grip portion 51, a slit 51h penetrating between the bottom surface 51f of the substantially square columnar recess 51e and the recess 51e and the lower surface 51g of the grip portion 51 is provided. The switch member 70, which will be described later, is inserted into the recess 51e and the slit 51h. Further, the region on the base end side of the upper surface 51d with respect to the recess 51e is formed in a concave shape gradually separated from the lower surface 51g toward the tip side. As a result, the indwelling needle assembly 1 allows a holding method (so-called vertical holding) in which the thumb is arranged on the upper surface 51d and the index finger is arranged on the lower surface 51g.

Further, by configuring the grip portion 51 in a substantially square columnar shape that can be held horizontally or vertically, it is possible to prevent rolling when the housing 50 is placed on a desk or the like. As a result, it is not necessary to separately provide a protrusion or the like for preventing rolling on the housing 50, so that the housing 50 can be more easily held and can be configured into a convenient shape. In the present embodiment, in particular, by configuring the left and right side surfaces 51a and 51b of the grip portion 51 to project outward, not only the operability at the time of puncture is improved as described above, but also the rolling prevention function is provided. It is improving.

A rounded 51i is provided at the corner on the tip side of the grip portion 51. Further, the base end side end portion of the grip portion 51 is configured so that the outer shape gradually projects toward the base end side and changes from a quadrangle to a circle, and when combined with the inner needle accommodating member 50b. The end faces of the grip portion 51 and the inner needle accommodating member 50b are in close contact with each other. Further, the outer diameter of the base end side end portion of the grip portion 51 is substantially the same as the outer diameter of the tip end side end portion of the inner needle accommodating member 50b. That is, the base end side end portion of the grip portion 51 is configured so that a step does not occur between the grip portion 51 and the inner needle accommodating member 50b, whereby the housing 50 has a shape that is easy to hold during use.

The connecting portion 52 is a portion that is inserted into and fitted into the inner needle accommodating member 50b. The outer diameter of the connecting portion 52 is set to be slightly smaller than the inner diameter of the inner needle accommodating member 50b. Further, a retaining protrusion 52a continuous in the circumferential direction is provided at a position slightly closer to the tip of the intermediate portion of the connecting portion 52.

The extension portion 53 is a portion that accommodates and holds a part of the inner needle base 40 inside, and also detachably holds the outer needle base 20 fitted to the tip portion. As shown in FIGS. 1 and 2A and 2B, the extending portion 53 has a substantially cylindrical first outer diameter portion 53a connected to the grip portion 51, and the extending portion 53 toward the tip side from the first outer diameter portion 53a. It is composed of a substantially hollow truncated cone-shaped reduced diameter portion 53b whose diameter is gradually reduced, and a substantially cylindrical second outer diameter portion 53c extending from the reduced diameter portion 53b to the tip side. Further, the extension portion 53 is provided with a stopper 53d on the lower side of the drawing, that is, on the outer peripheral surface of the inner needle 30 and the outer needle 10 on the puncture target side during use.

The first outer diameter portion 53a has a larger diameter than the second outer diameter portion 53c, and a large diameter portion 42 of the inner needle base 40 and a part of the urging member 60 are housed therein. By providing such a first outer diameter portion 53a, the inner needle base 40 can be arranged closer to the tip end side. This makes it possible to confirm the back blood in the inner needle base 40 without being disturbed by the hand or finger that grips the grip portion 51.

The reduced diameter portion 53b is a portion that smoothly connects the outer peripheral surface of the first outer diameter portion 53a and the outer peripheral surface of the second outer diameter portion 53c. By providing such a reduced diameter portion 53b, it is easy to arrange a finger that presses the outer needle base 20 in order to push the outer needle 10 along the inner needle 30, and it is possible to eliminate the catch when moving the finger. Can be done.

The second outer diameter portion 53c is set to an outer diameter that can be inserted and fitted into the opening (for example, luer taper) of the outer needle base 20. Further, by separately providing the stopper 53d, the second outer diameter portion 53c is configured such that a portion (non-insertion portion) that is not inserted into the opening of the outer needle base 20 has substantially the same outer diameter. Therefore, the outer diameter difference D between the non-insertion portion of the second outer diameter portion 53c and the opening side end surface 22 of the outer needle base 20 is larger than that when a conventional stepped cylinder is used. .. That is, the opening side end surface 22 of the outer needle base 20 is in a state where it can be easily pressed with a fingertip.

Further, in the present embodiment, by arranging the inner needle base 40 closer to the tip side than the regulation portion 73 of the switch member 70, the axial length of the second outer diameter portion 53c is appropriate for arranging the pad of the finger. It is set to have a long length. This makes it possible to make it easier to press the outer needle base 20.

FIG. 3 is an external perspective view showing a part of the tip side of the base member 50a, and shows a case of being viewed from the lower side. As shown in the figure, the stopper 53d is formed in a rib shape that partially protrudes in the circumferential direction from the outer peripheral surfaces of the second outer diameter portion 53c and the reduced diameter portion 53b in the circumferential direction and is continuous in the axial direction. There is. Further, the stopper 53d is provided at two locations below the second outer diameter portion 53c and the reduced diameter portion 53b, that is, near the lowermost portion of the inner needle 30 and the outer needle 10 on the puncture target side during use. ing.

The stopper 53d of the present embodiment is configured such that the top surface is flush with the outer peripheral surface of the first outer diameter portion 53a. That is, the reduced diameter portion 53b, the second outer diameter portion 53c, and the stopper 53d of the extending portion 53 are configured by removing a part of a cylinder having the same outer diameter as the first outer diameter portion 53a. It is also possible to say.

As shown in FIG. 2B, the outer needle base 20 is arranged at a predetermined position in the axial direction by bringing the opening side end surface 22 of the outer needle base 20 into contact with the tip end side end surface 53e of the stopper 53d. At this time, a part of the lower end surface 22 of the outer needle base 20 on the opening side is hidden by the stopper 53d, but most of it is exposed.

In this way, by making the stopper 53d partially project in the circumferential direction of the extending portion 53, the pressable area on the opening side end surface 22 of the outer needle base 20 can be expanded more than before. In particular, by forming the stopper 53d into a rib shape that is continuous in the axial direction, the stopper 53d can be used as a reinforcing member, so that the outer diameter of the first outer diameter portion 53a in the non-insertion portion is expanded. It is possible to secure the strength and rigidity required for the extending portion 53 without any problem. Further, by projecting the stopper 53d only in the lower portion where the fingertip is not arranged in the normal use state, the pressing by the fingertip is performed while ensuring the strength and rigidity required for the extending portion 53. The operation can be prevented from being hindered by the stopper 53d.

Further, by providing the rib-shaped stopper 53d at a plurality of locations (two locations in the present embodiment) appropriately separated in the circumferential direction of the extending portion 53, the moldability of the base member 50a and the outer needle base are provided. It is possible to achieve both stable positioning of 20. That is, while the stopper 53d is configured to be relatively narrow to prevent molding defects such as sink marks and voids, the outer needle base 20 is tilted by abutting the outer needle base 20 at a plurality of points in the circumferential direction. It can be suppressed and the outer needle base 20 can be stably held.

The through hole 54 has a first inner diameter portion 54a having an inner diameter slightly larger than the outer diameter of the small diameter portion 41 of the inner needle base 40 and a second inner diameter having an inner diameter slightly larger than the outer diameter of the receiving portion 45 of the inner needle base 40. It is composed of a part 54b and a part 54b. The first inner diameter portion 54a is provided at the tip end portion of the extension portion 53, and the other portion of the through hole 54 is the second inner diameter portion 54b. Further, on the base end side of the first inner diameter portion 54a, detent grooves 54c in which the detent projections 41a of the inner needle base 40 are housed are provided at two places.

The inner needle base 40 is arranged on the tip side of the through hole 54 in a state where the tip of the small diameter portion 41 protrudes from the extending portion 53. Therefore, in the inner needle base 40, the small diameter portion 41 is supported by the first inner diameter portion 54a, and the receiving portion 45 is supported by the second inner diameter portion 54b, so that the base member 50a has less rattling. It is housed inside. Further, in this state, since the detent projection 41a is housed in the detent groove 54c, the inner needle base 40 does not rotate relative to the base member 50a.

The inner needle accommodating member 50b is a bottomed cylindrical member having a bottom portion 55 on the base end side while having a slightly reduced outer diameter toward the base end side. On the inner peripheral surface of the inner needle accommodating member 50b, a retaining groove 56 continuous in the circumferential direction is provided at a position corresponding to the retaining protrusion 52a of the connecting portion 52 of the base member 50a. By engaging the retaining groove 56 and the retaining protrusion 52a, the base member 50a and the inner needle accommodating member 50b are not easily separated.

Further, the inner needle accommodating member 50b is made of an appropriate resin, and the bottom portion 55 has a shape protruding (recessed) inward due to the mold structure at the time of resin molding. That is, the bottom portion 55 is a portion where the injection molding gate (the inlet of the resin flowing into the cavity of the mold) is arranged, and by denting the bottom portion 55 so that the thickness becomes substantially constant, sink marks, voids, etc. are generated. The gate mark, which may be a sharp cutting mark, does not protrude to the outside while preventing the above. By arranging the gate at the bottom 55, the flow of the resin in the cavity can be smoothed and the moldability can be improved. Further, since it is not necessary to provide a recess for preventing the protrusion of the gate mark on the outer peripheral surface that is likely to come into contact with the user of the indwelling needle assembly 1 or the living body to be punctured, the shape of the inner needle accommodating member 50b is easy to hold. Can be configured.

The urging member 60 is for urging the removed inner needle 30 toward the base end side and pulling it into the housing, and is composed of a coil spring. The urging member 60 is arranged in a state in which the large diameter portion 42 of the inner needle base 40 is inserted in the second inner diameter portion 54b of the through hole 54. Therefore, the urging member 60 is compressed by being compressed between the end surface on the tip end side of the second inner diameter portion 54b (the step portion with the first inner diameter portion 54a) and the receiving portion 45 of the inner needle base 40. A force is generated and the inner needle base 40 is urged toward the base end side.

The tip end side of the second inner diameter portion 54b is configured to gradually reduce in diameter toward the tip end side. By doing so, the urging member 60 can be fitted to the second inner diameter portion 54b and held by the base member 50a at the time of assembly, so that the assembling property can be improved.

The switch member 70 normally regulates the movement of the inner needle 30 and the inner needle base 40 by the urging force of the urging member 60, and is for releasing this regulation by moving by the pressing operation of the user. FIG. 4 is an external perspective view of the switch member 70. As shown in the figure, the switch member 70 connects a substantially quadrangular pyramid-shaped exposed portion 71, two substantially flat plate-shaped guide portions 72 extending downward from the exposed portion 71, and two guide portions 72. It is composed of a substantially U-shaped regulation unit 73 provided in the above.

The exposed portion 71 is a portion exposed from the grip portion 51 of the housing 50 and pressed by the user. The top surface 71a of the exposed portion 71 is an inclined surface 71b that is inclined so that the portion that becomes the tip side when arranged in the grip portion 51 is gradually lowered toward the tip side (that is, close to the gradually grip portion 51). It has become. Further, groove-shaped engaging recesses 71c that engage with a part of the protector 80 are provided on the portions that become both side surfaces when arranged in the grip portion 51 of the exposed portion 71.

The guide portion 72 is a portion accommodated in the recess 51e when arranged in the grip portion 51, and is provided so as to slide with respect to the inner surface of the recess 51e. The guide portion 72 also functions as a reinforcing member against the pressing force of the user. That is, since the bending strength of the regulating portion 73 is increased by providing the guide portion 72, the switch member 70 can be prevented from being easily damaged even when an excessive force is applied to the exposed portion 71.

The restricting portion 73 is a portion that is inserted into the slit 51h when arranged in the grip portion 51 and comes into contact with the proximal end side end surface of the inner needle base 40. The first locking groove 73a and the second locking groove 73b (one-sided locking of the present invention) having a substantially V-shaped cross section are formed on both side surfaces when arranged on the grip portion 51 of the regulating portion 73. Parts) are provided respectively. Each corner of the regulating portion 73 is provided with a relatively large chamfer so that the corner portion in the slit 51h during assembly does not get caught, and the corner portion of the inner needle base 40 does not get caught during operation. It has become like.

The switch member 70 is movably arranged in the grip portion 51 between a restricted position for restricting the movement of the inner needle 30 and the inner needle base 40 and a release position for releasing the restriction on the movement of the inner needle 30 and the inner needle base 40. Will be done. 1 and 2A and 2B show the case where the switch member 70 is in the restricted position. As shown in these figures, in the regulated position, substantially the entire exposed portion 71 is exposed from the grip portion 51, the inclined surface 71b is located on the tip side, and the engaging recess 71c is continuous in the axial direction. Become. Further, the lower portion of the regulating portion 73 is in contact with the proximal end side end surface of the inner needle base 40.

5A and 5B are sectional views taken along line II-II of FIG. 2A. FIG. 5A shows a case where the switch member 70 is in the restricted position with the protector 80 attached. Further, FIG. 5B shows a case where the switch member 70 is moved to the release position with the protector 80 removed.

As shown in FIG. 5A, the protector 80 is provided with a first engaging projection 82 (engaging portion of the present invention) inside, and by attaching the protector 80 to the housing 50, this first engagement is provided. The joint protrusion 82 and the engaging recess 71c of the switch member 70 are engaged with each other. That is, when the protector 80 is attached, the switch member 70 cannot move to the release position, and the operation of the switch member 70 is surely prevented.

Further, a locking projection 51j (other side locking portion of the present invention) having a substantially V-shaped cross section is provided on the inner surface of the slit 51h, and when the switch member 70 is in the regulated position, this locking is performed. The protrusion 51j is accommodated in the first locking groove 73a and locked. Therefore, the switch member 70 does not easily move even after the protector 80 is removed. As a result, even if the user's finger or the like touches the exposed portion 71 before or during the puncture, the possibility that the switch member 70 operates can be reduced, so that the indwelling needle assembly 1 can be easily handled. It becomes possible to do.

As shown in FIG. 5B, when the user presses the exposed portion 71, the switch member 70 moves toward the lower release position. At this time, the locking projection 51j escapes from the first locking groove 73a due to the elastic deformation of the regulating portion 73 or the grip portion 51, and when the switch member 70 reaches the release position, the restoring force of the elastic deformation causes the locking projection 51j to become the first. It is housed in the locking groove 73b of No. 2 and is locked in the locking groove 73b.

By providing the first locking groove 73a and the second locking groove 73b together with the locking projection 51j in this way, not only is the switch member 70 not easily operated even after the protector 80 is removed, but also the switch member 70 is not easily operated. It is possible to make the user feel a click when the switch member 70 is pressed.

That is, the user can know that the switch member 70 has moved to the release position by the touch of the fingertip, and the operability of the indwelling needle assembly 1 is improved. In general, it is difficult for the user to know the extension of the urging member 60 and the movement of the inner needle 30 and the inner needle base 40 by the touch of a fingertip, and in the conventional indwelling needle assembly, the switch member has reliably reached the release position. There was a problem that it was difficult for the user to determine whether or not it was, but according to the indwelling needle assembly 1, the user could easily confirm that the switch member 70 had reached the release position with a click feeling of the fingertip. It is possible to distinguish.

In this embodiment, in particular, the first locking groove 73a and the second locking groove 73b are provided on the outer surfaces of the two arms of the substantially U-shaped regulating portion 73 connected to the flat plate-shaped guide portion 72, and are engaged. When the stop protrusion 51j escapes from the first locking groove 73a, the regulating portion 73 is elastically deformed so that the two arms are close to each other, and the grip portion 51 is elastically deformed so that the slit 51h widens. Therefore, it is possible to generate a click feeling without hindering the smooth movement of the switch member 70.

The shape of the regulation unit 73 may be U-shaped, V-shaped, or the like. Further, the shapes of the first locking groove 73a, the second locking groove 73b, and the locking projection 51j are not particularly limited, and an appropriate shape can be adopted. Further, the first locking groove 73a, the second locking groove 73b and the locking projection 51j may be provided with protrusions on the switch member 70 side and grooves on the grip portion 51 side, or the switch member. One groove or protrusion may be provided on the 70 side and two protrusions or grooves may be provided on the grip 51 side.

As shown in FIG. 5B, at the release position, the regulating portion 73 is in a state where it does not come into contact with the base end side end surface of the inner needle base 40. Therefore, the inner needle base 40 passes through the inside of the regulating portion 73 together with the inner needle 30 and moves toward the base end side in the housing 50, and finally the inner needle 30 is housed in the housing 50. It becomes.

FIG. 6 is a cross-sectional view showing a state in which the inner needle 30 is housed in the housing 50. As shown in the figure, the inner needle base 40 is pressed against the bottom portion 55 of the inner needle accommodating member 50b by the urging member 60, and the entire inner needle 30 is accommodated in the housing 50. Further, the bottom portion 55 of the inner needle accommodating member 50b is partially accommodated in the accommodating portion 44 of the inner needle base 40. By accommodating the bottom portion 55 in the accommodating portion 44 in this way, the inner needle 30 can be stably held in the housing 50 by utilizing the bottom portion 55 recessed to prevent the gate mark from protruding, and safety is achieved. Can be increased. Further, since the total length of the housing 50 in the axial direction can be shortened, the indwelling needle assembly 1 can be made compact and the operability can be improved.

Note that the bottom portion 55 and the accommodating portion 44 may be fitted to each other to more reliably prevent the inner needle 30 from re-protruding. Further, the filter 43 may be made of a material softer than the inner needle base 40, and the bottom portion 55 may collide with the filter 43 to absorb the impact. Further, the base member 50a and the switch member 70 may be configured so that the regulating portion 73 does not protrude from the base member 50a when the switch member 70 is in the release position. In this case, even when a finger is placed on the lower surface 51 g of the grip portion 51, the operation of the switch member 70 can be prevented from being hindered by the finger.

7A and 7B are views showing a modified example of the switch member 70, and show a case where the switch member 70 is in the regulated position with the protector 80 removed.

FIG. 7A shows an example in which a leaf spring-shaped elastic member 74 is added to the switch member 70. In this example, the elastic member 74 is a flat plate-shaped member, and is provided so as to project inward from the guide portion 72. Then, the elastic member 74 hits a part of the grip portion 51 (in this example, an arc-shaped portion on the tip end side of the bottom surface 51f of the recess 51e) as the switch member 70 moves from the restricted position to the release position. It comes into contact and elastically deforms. Therefore, the switch member 70 is urged toward the regulated position by the elastically deformed elastic member 74.

By providing the elastic member 74 in this way, an appropriate resistance is given to the movement of the switch member 70, and the switch member is provided before the locking projection 51j is locked with the second locking groove 73b. It is possible to push the 70 back to the regulated position. As a result, the easy operation of the switch member 70 after the protector 80 is removed can be appropriately suppressed, the indwelling needle assembly 1 can be easily handled, and the operability can be improved. Moreover, a good operation feeling can be given to the switch member 70.

The elastic member 74 may be configured such that the deformation shifts from the elastic deformation to the plastic deformation as the switch member 70 moves. The shape of the elastic member 74 is not particularly limited, and any shape that can be elastically deformed as appropriate can be adopted. Further, the elastic member 74 may be provided integrally with the grip portion 51, and is provided separately from the switch member 70 and the grip portion 51, for example, a metal coil spring or a leaf spring. May be good.

FIG. 7B shows an example in which the retaining function of the switch member 70 is improved. In this example, the protrusion amount (height) of the locking projection 51j and the depression amount (depth) of the first locking groove 73a and the second locking groove 73b are increased, and the first locking groove is increased. The top of the protruding portion of the V-shaped cross section between the 73a and the second locking groove 73b is cut out.

The locking projection 51j and the first locking groove 73a not only suppress the movement of the switch member 70 from the regulated position to the release position, but also suppress the movement of the switch member 70 from the regulated position to the opposite side of the release position (upper part of the figure). It is also designed to suppress movement to. That is, the locking projection 51j and the first locking groove 73a also play a function of preventing the switch member 70 from coming off from the grip portion 51. This retaining function can be improved by increasing the amount of protrusion of the locking projection 51j and the amount of depression of the first locking groove 73a to increase the locking force, but simply increasing the locking force is sufficient. Since the pressing force required to move the switch member 70 from the regulated position to the release position also increases, there arises a problem that the operability of the switch member 70 deteriorates.

Therefore, in this example, the case where the switch member 70 moves from the regulated position to the release position is better than the case where the switch member 70 moves from the regulated position to the opposite side of the release position. Is also configured so that the lock can be easily released. Specifically, by cutting out the top of the protruding portion between the first locking groove 73a and the second locking groove 73b, the switch member 70 moves from the regulated position to the released position. The height at which the locking projection 51j escapes from the first locking groove 73a is reduced, and the pressing force required to move the switch member 70 is reduced.

By doing so, it is possible to improve the retaining function of the switch member 70 and prevent the pressing force required for operation from becoming excessively large. In other words, according to the example shown in FIG. 7B, it is possible to achieve both good operability of the switch member 70 due to an appropriate click feeling and an appropriate pressing force, and reliable retaining of the switch member 70.

It should be noted that instead of reducing the climbing height of the first locking groove 73a on the release position side, the side surface of the locking projection 51j or the first locking groove 73a on the release position side and the side surface opposite to the release position are opposite. The inclination angle of the may be different. Further, an appropriate ratchet mechanism for restricting the movement direction of the switch member 70 from the regulation position to the release position is gripped, for example, the locking projection 51j is formed in the shape of a tongue piece protruding diagonally downward in the drawing. It may be provided in the portion 51 or the switch member 70.

Returning to FIGS. 1 and 2A and 2B, the protector 80 covers the outer needle 10 and the inner needle 30 to prevent the tip of the inner needle 30 from sticking into something, and the outer needle 10 and the thin tube. This is to prevent the inner needle 30 from colliding with something and breaking or the like. Further, the protector 80 not only covers the exposed portion 71 of the switch member 70 to prevent something from touching the exposed portion 71, but also prevents the switch member 70 from operating when the protector 80 is mounted on the housing. It is configured in.

The protector 80 is configured such that the opening side of a bottomed cylinder having a bottom portion 81 on the tip end side is bulged to match the shape of the grip portion 51 of the housing 50 and the exposed portion 71 of the switch member 70. Similar to the bottom portion 55 of the inner needle accommodating member 50b, the bottom portion 81 is formed in an inwardly projecting (recessed) shape, and an injection-molded gate is arranged. This makes it possible to improve the moldability of the protector 80 and increase the degree of freedom in the shape of the protector 80. A flat surface portion 80a for preventing rolling is provided on the lower side of the outer peripheral surface on the opening side of the protector 80.

FIG. 8A is an external perspective view of the protector 80 as viewed from the opening side, FIG. 8B is a view of the inside of the protector 80 as viewed from the opening side, and FIG. 8C is a sectional view taken along line III-III of FIG. 8A. As shown in these figures, the inner side surface of the protector 80 is provided with two first ones so as to be continuous (extended) in the axial direction at positions corresponding to both side surfaces of the exposed portion 71 of the switch member 70. 2 provided so as to be continuous (extended) in a direction perpendicular to the axial direction (vertical direction in FIGS. 2A and 2B) at a position corresponding to the tip portions of the left and right side surfaces 51a and 51b of the gripping portion 51 and the engaging protrusion 82. Two second engaging protrusions 83 and eight rib-shaped inclination reducing portions 84 provided so as to surround the outer needle base 20 at positions corresponding to the outer needle base 20 are provided.

The first engaging protrusion 82 is provided so as to engage with the engaging recess 71c of the switch member 70 as described above, and the second engaging protrusion 83 is left and right of the grip portion 51 of the housing 50. It is provided so as to engage with the overhanging portion on the tip side of the side surfaces 51a and 51b (see FIG. 5A). The protector 80 is attached to the housing 50 by bringing the opening side closer to the housing 50 from the tip side of the inner needle 30 along the axial direction. Since the first engaging protrusion 82 is provided so as to be continuous in the axial direction, the protector 80 is directly engaged with the engaging recess 71c by moving in the axial direction.

The second engaging projection 83 gets over the overhanging portions of the left and right side surfaces 51a and 51b of the grip portion 51 by elastic deformation of the protector 80 or the grip portion 51, and then presses against the left and right side surfaces 51a and 51b, causing the protector 80 to rattle. It suppresses sticking and functions as a stopper. The movement of the protector 80 toward the base end side is regulated by the vertical surface 85 provided on the back side of the first engaging projection 82. That is, the protector 80 can be positioned in the axial direction by bringing the vertical surface 85 into contact with the grip portion 51 when it is mounted on the housing 50.

The first engaging projection 82 regulates the operation of the switch member 70 as described above, and constitutes the engaging portion of the present invention. Specifically, the first engaging protrusion 82 is released from the restricted position of the switch member 70 by the upper contact surface 82a coming into contact with the inner surface of the engaging recess 71c in a state of being engaged with the engaging recess 71c. It is configured to regulate movement to a position.

A support surface 86 facing the upper surface 51d of the grip portion 51 is provided in the vicinity of the base end portion of the first engaging projection 82 of the protector 80, and the support surface 86 comes into contact with the upper surface 51d of the grip portion 51. As a result, the downward movement of the protector 80 (downward in FIGS. 2A and 2B) is restricted. Therefore, the switch member 70 is also restricted from moving toward the lower release position when the inner surface of the engaging recess 71c comes into contact with the contact surface 82a of the first engaging projection 82.

That is, when the protector 80 is attached, the switch member 70 is surely prevented from moving to the release position. Therefore, even if an impact, vibration, or the like is applied to the indwelling needle assembly 1, the switch member 70 does not operate as long as the protector 80 is attached, and the indwelling needle assembly 1 can be easily handled.

As described above, in the present embodiment, the switch member 70 does not easily operate even after the protector 80 is removed by providing the locking projection 51j and the first locking groove 73a. Further, in the present embodiment, by providing the inclined surface 71b on the tip end side of the switch member 70, when the first engaging projection 82 is disengaged from the engaging recess 71c when the protector 80 is removed, the opening edge of the protector 80 is provided. The switch member 70 is less likely to be pressed. Therefore, in the indwelling needle assembly 1 of the present embodiment, the switch member 70 does not easily operate even after the protector 80 is removed, and the handling is extremely easy.

The first engaging projection 82 also has a function of suppressing rattling in the vertical direction of the protector 80. The rattling of the protector 80 in the left-right direction is mainly suppressed by the second engaging projection 83. Further, since the first engaging projection 82 is provided so as to be continuous in the axial direction, it also functions as a guide for restricting the moving direction of the protector 80 in the axial direction when the protector 80 is removed from the housing 50. It has become. By providing such a guide, the protector 80 can be smoothly removed.

Further, by engaging the protector 80 with the switch member 70, the protector 80 and the housing 50 are engaged with each other by engaging the second engaging projection 83 with the left and right side surfaces 51a and 51b of the grip portion 51. It is possible to have only a simple configuration such as. As a result, the degree of freedom in the shape of the housing 50 is increased, so that each part such as the grip portion 51 and the extension portion 53 can be formed into a shape having excellent operability.

Further, in the present embodiment, the inclination of the protector 80 with respect to the housing 50 is reduced by the inclination reducing portion 84 that abuts on the outer needle base 20, so that the degree of freedom in the shape of the housing 50 can be further increased. The inclination reducing portion 84 is formed in a rib shape that is continuous in the axial direction, and surrounds the outer needle base 20 at a position further back than the first engaging protrusion 82 and the second engaging protrusion 83. In addition, it is provided at eight places at equal intervals in the circumferential direction. Therefore, the inclination reducing portion 84 reduces the inclination of the protector 80 in the vertical direction and the horizontal direction by contacting the rib top surface 84a with the outer peripheral surface of the outer needle base 20.

By providing the tilt reducing portion 84 that comes into contact with the outer needle base 20 to reduce the tilt in this way, it is not necessary to provide the housing 50 with an engaging structure for tilt reduction, so that the housing 50 can be operated easily. It can have an excellent shape. In particular, since it is possible to reduce the outer diameter of the extension portion 53 that holds the outer needle base 20, the outer needle base 10 is pressed by a finger after the inner needle 30 is punctured as described above. The pushing operation can be facilitated.

The number and arrangement positions of the tilt reducing portions 84 are not particularly limited, and an appropriate number of tilt reducing portions 84 capable of contacting the outer needle base 20 to reduce the tilt of the protector 80 are placed at appropriate positions. Can be placed. Further, the shape of the tilt reducing portion 84 is not particularly limited as long as it can appropriately abut the outer needle base 20, for example, a columnar tilt reducing portion projecting toward the outer needle base 20. 84 or a rib-shaped inclination reducing portion 84 continuous in the circumferential direction may be provided.

9A to 9C are diagrams showing a modified example of the protector 80. FIG. 9A shows an example in which the first engaging projection 82 is configured to project in the axial direction. In this example, the first engaging projection 82 is formed in a flat plate shape or a rod shape, and is provided so as to project from the inside of the protector 80 toward the proximal end side. Further, the exposed portion 71 of the switch member 70 is provided with an engaging recess 71c that is recessed in the axial direction, and by mounting the protector 80 on the housing 50, the first engaging projection 82 becomes an engaging recess. It is designed to be inserted in 71c.

Also in this example, when the switch member 70 is moved from the restricted position to the release position, the contact surface 82a of the first engaging protrusion 82 comes into contact with the inner surface of the engaging recess 71c, and the first engaging protrusion 82 The lower side surface 82b is regulated by contacting the grip portion 51. Further, the engagement between the first engaging protrusion 82 and the engaging recess 71c suppresses the vertical rattling of the protector 80, and the first engaging protrusion 82 functions as a guide when the protector 80 is removed. To do. As described above, the first engaging projection 82 may project in the axial direction, and in this case as well, the same effect as that of the first engaging projection continuous in the axial direction can be obtained.

FIG. 9B shows an example in which the first engaging projection 82 is engaged in the regulating portion 73 of the switch member 70. In this example, the first engaging projection 82 is provided on the lower inner surface of the protector 80 in an axially continuous rib shape. Further, the regulating portion 73 of the switch member 70 is configured to protrude from the housing 50 when the switch member 70 is in the regulated position. The regulating portion 73 is provided with a groove-shaped engaging recess 71c that is continuous in the axial direction at a position corresponding to the first engaging projection 82, and by mounting the protector 80 on the housing 50, , The first engaging protrusion 82 is adapted to engage with the engaging recess 71c.

Also in this example, when moving the switch member 70 from the regulated position to the release position, the contact surface 82a of the first engaging projection 82 abuts on the bottom surface of the engaging recess 71c, and the support surface 86 touches the grip portion 51. It is regulated by contact. Further, the engagement between the first engaging protrusion 82 and the engaging recess 71c suppresses the vertical rattling of the protector 80, and the first engaging protrusion 82 functions as a guide when the protector 80 is removed. As described above, the first engaging projection 82 is not limited to the one that engages in the exposed portion 71 of the switch member 70, and may be any one that engages with any part of the switch member 70.

FIG. 9C shows an example in which the distance between the two first engaging protrusions 82 is gradually narrowed toward the tip side. By doing so, the exposed portion 71 of the switch member 70 can be sandwiched between the two first engaging projections 82, so that the protector 80 can be loosened without changing the shape of the housing 50. It is possible to reduce the stickiness. In particular, since it is possible to reduce rattling not only in the direction perpendicular to the axis but also in the axial direction, it is possible to further facilitate the handling of the indwelling needle assembly 1.

In addition, instead of narrowing the distance between the two first engaging protrusions 82, the distance between the bottom surfaces of the two engaging recesses 71c is gradually increased toward the tip side to reduce rattling. You may. Further, the rattling may be reduced by changing the thickness of the first engaging protrusion 82 and the width of the groove of the engaging recess 71c.

In addition, although not shown, the protector 80 side may be provided with a recess which is continuous in the axial direction or recessed in the axial direction, and the switch member 70 side may be provided with a protrusion which is continuous in the axial direction or protrudes in the axial direction. Good. Further, the protector 80 may engage with a part of the switch member 70, but may not cover the exposed portion 71 of the switch member 70.

Further, the protector 80 may not come into contact with the housing 50 when the switch member 70 is in the regulated position, but may come into contact with only the outer needle base 20 and the switch member 70. Further, the protector 80 may be transparent, opaque, or may be configured in a mesh shape or a grid shape.

Next, a modified example of the inner needle base 40 and the housing 50 will be described. In the following modified examples, the same parts as those in the above example are designated by the same reference numerals, and the description thereof will be omitted.

10A is a plan view (top view) of a modified example of the inner needle base 40, FIG. 10B is a side view of a modified example of the inner needle base 40, and FIG. 10C is a sectional view taken along line IV-IV of FIG. 10A. .. In this example, first, recesses 41c are provided at four locations on the outer peripheral surface of the inner needle fixing portion 41b of the small diameter portion 41. The inner needle fixing portion 41b is thicker than the other portions. In this way, by providing appropriate recesses 41c at a plurality of places, the inner needle fixing portion 41b is maintained in strength and sink marks during injection molding. It is possible to prevent the generation of voids and the like, and improve the moldability. In this example, the case where the recess 41c having a flat rectangular bottom surface is provided is shown, but the shape of the recess 41c may be another shape. Further, the number of recesses 41c is not limited.

In this example, a tapered tapered portion 46 is also provided between the small diameter portion 41 and the large diameter portion 42. The flat surface portions 42b are provided at two positions of the large diameter portion 42 opposite to each other. The flat surface portion 42b is provided so as to cut off a part of the large diameter portion 42b substantially parallel to the axis. Further, the distance between the two flat surface portions 42b is substantially the same as the outer diameter of the small diameter portion 41.

In this way, by providing the flat surface portion 42b on the substantially stepped cylindrical inner needle base 40, it is possible to give directionality in the circumferential direction, so that the assembly of the indwelling needle assembly 1 by the automatic machine is facilitated. It is possible to improve productivity. Specifically, for example, the orientation of the inner needle base 40 in the circumferential direction can be determined by gripping the flat surface portion 42b, so that the detent projection 41a when the inner needle base 40 is inserted into the base member 50a is positioned. It can be facilitated.

Further, in this example, a roundness 45a is provided at a corner portion on the base end side of the receiving portion 45. By providing the roundness 45a in this way, it is possible to prevent the switch member 70 from being caught and improve the assembleability and operability.

Inside the inner needle fixing portion 41b of this example, a substantially funnel-shaped adhesive accommodating portion 41d is provided on the tip end side, and an outflow prevention portion 41e having an inner diameter slightly larger than the outer diameter of the inner needle 30 is provided on the base end side. It is provided in. By configuring the inside of the inner needle fixing portion 41b in this way, it is possible to prevent the adhesive from flowing out to the base end side (outflow to the flush chamber portion 47 described later) and to securely fix the inner needle 30. Become. The outflow prevention portion 41e is configured to have a tapered shape in which the diameter is slightly increased toward the tip end side except for a part on the base end side, so that a small amount of adhesive flows into the outflow prevention portion 41e. It has become.

Further, a flush chamber portion 47 for storing blood that has passed through the inner needle 30 is provided on the tip side between the inner needle fixing portion 41b and the accommodating portion 44 inside the inner needle base 40 of this example, and the filter 43. A filter arranging portion 48 is provided on the base end side. The inner diameter of the filter arranging portion 48 is larger than the inner diameter of the flush chamber portion 47, and the filter 43 is positioned in the axial direction by abutting on the step portion 49 between the two. Further, the inner peripheral surface of the accommodating portion 44 is smoothly continuous with the inner peripheral surface of the filter arranging portion 48, and the filter 43 can be smoothly inserted from the proximal end side and arranged in the filter arranging portion 48. ing.

FIG. 11A is a sectional view taken along line IV-IV of FIG. 10A. In the inner needle base 40 shown in FIGS. 10A to 10C, a flow passage having a diameter smaller than that of the outflow prevention portion 41e is between the outflow prevention portion 41e and the flush chamber portion 47. The case where 41f is provided is shown. The flow passage 41f has an inner diameter substantially the same as the inner diameter of the inner needle 30, and is provided so as to communicate with the inside of the inner needle 30 fixed to the inner needle fixing portion 41b. Therefore, the blood that has passed through the inner needle 30 flows into the flush chamber portion 47 via the flow passage 41f.

In this way, by providing the flow passage 41f having a diameter smaller than that of the outflow prevention portion 41e, it is possible to more reliably prevent the adhesive from flowing out to the flush chamber portion 47. Further, the axial positioning of the inner needle 30 can be facilitated by bringing the base end surface of the inner needle 30 into contact with the stepped portion 41g between the outflow prevention portion 41e and the flow passage 41f.

FIG. 11B is a side view showing a case where the friction portion 90 is provided on the inner needle base 40 shown in FIGS. 10A to 10C. The friction portion 90 is composed of a ring-shaped (annular) member fitted to the outer peripheral surface of the large diameter portion 42 at a position adjacent to the receiving portion 45 in the axial direction. This ring-shaped member is made of an elastomer (elastic material) that is more flexible than the resin constituting the inner needle base 40, such as synthetic rubber. The outer diameter of the friction portion 90 is set to be substantially the same as the outer diameter of the receiving portion 45 (that is, the maximum outer diameter of the inner needle base) or slightly larger than the outer diameter of the receiving portion 45. That is, when the inner needle base 40 moves due to the urging force of the urging member 60, the friction portion 90 comes into contact with the inner peripheral surface of the housing 50 (base member 50a or inner needle accommodating member 50b), thereby causing the inner needle. It functions as a brake that reduces the moving speed of the base 40.

In the conventional indwelling needle assembly, when the inner needle is housed in the housing by the urging force of a coil spring or the like, the blood adhering to or staying on the inner needle is scattered around depending on the moving speed of the inner needle and the inner needle base. There was a problem that there was. For this reason, there is a risk that virus infection or the like may occur due to the scattered blood adhering to the user or the like, even though the mechanism for accommodating the inner needle in the housing is provided.

The modified example shown in FIG. 11B is intended to provide a more safe indwelling needle assembly 1 in view of such a situation. That is, a friction portion 90 configured to generate a larger frictional force with the housing 50 than other parts of the inner needle base 40 is provided at a position in the inner needle base 40 that can come into contact with the housing 50. As a result, the moving speed of the inner needle base 40 can be reduced, and the scattering of blood from the inner needle 30 can be prevented.

The material of the friction portion 90 is not particularly limited, and various known materials can be adopted. Further, the shape of the friction portion 90 is not particularly limited, and for example, the friction portion 90 may be configured so that the outer peripheral surface exhibits an elliptical shape, a polygonal shape, or the like when viewed from the axial direction. Further, the surface (outer peripheral surface) of the friction portion 90 in contact with the housing 50 may be a flat surface or a curved surface. Further, the surface of the friction portion 90 in contact with the housing 50 may be provided with protrusions, uneven shapes, or the like, and the friction portion 90 may bite into the inner peripheral surface of the housing 50 to increase the frictional force.

Further, the friction portion 90 may be formed by fixing a member different from the inner needle base 40 to the inner needle base 40 by engaging, engaging, bonding or the like, or by insert molding. It may be configured by integrally forming the needle base 40 and another member. Further, it may be configured by partially changing the shape of the inner needle base 40 instead of changing the material.

In the example shown in FIG. 11B, by fitting the ring-shaped member made of a flexible elastomer to the outer peripheral surface of the inner needle base 40 as described above, a significant increase in cost and productivity can be achieved. It is possible to provide the friction portion 90 without causing deterioration or the like. Further, by arranging the ring-shaped member constituting the friction portion 90 between the urging member 60 and the receiving portion 45, it is possible to prevent the friction portion 90 from being displaced in spite of its simple and inexpensive configuration. It is possible to reliably exert the deceleration function.

FIG. 12A is a plan view (top view) of a modified example of the housing 50, and FIG. 12B is a side view of a modified example of the housing 50. Further, FIG. 13A is a bottom view (bottom view) of a modified example of the housing 50, and FIG. 13B is a sectional view taken along line VV of FIG. 12A. In FIG. 13B, the base member 50 and the inner needle accommodating member 50b are shown in an exploded manner.

In this example, first, the portion of the extension portion 53 on the second outer diameter portion 53c on the tip side of the stopper 53d is configured to have a tapered shape corresponding to the luer taper of the outer needle base 20. This makes it possible to hold the outer needle base 20 more stably. Further, rounded 51k and 51l are provided at the corners of the upper edge of the slit 51h. As a result, it is possible to prevent the switch member 70 from being caught when the switch member 70 is inserted into the slit 51h during assembly, and to improve the assembling property.

In this example, the lower surface 51g side of the base member 50a is provided with a lower recess 51m similar to the recess 51e on the upper surface 51d side, and the thickness of the lower portion on the tip side of the slit 51h of the base member 50a is thick. Has been reduced. By doing so, it is possible to prevent the occurrence of sink marks and voids during injection molding of the base member 50a and improve the moldability.

Further, in this example, in the first inner diameter portion 54a of the through hole 54 of the base member 50a, detent grooves 54c are provided at two locations on the left and right sides. Normally, the user confirms the back blood into the inner needle base 40 by visual recognition from above. Therefore, by arranging the detent groove 54c sideways in this way, the visibility of the back blood is improved. It becomes possible.

Further,

chamfers

54d and 54e are provided at the corners on the base end side of the first inner diameter portion 54a and the detent groove 54c, respectively. By providing

such chamfers

54d and 54e, it is possible to prevent the small diameter portion 41 of the inner needle base 40 from being caught when being inserted into the first inner diameter portion 54a and improve the assembling property.

Further, in this example, by eliminating the reduced diameter portion on the tip end side of the second inner diameter portion 54b of the through hole 54, the tip end portion of the urging member 60 on the tip end side is divided into the first inner diameter portion 54a and the second inner diameter. The step portion 54f between the portions 54b is surely brought into contact with the step portion 54f so that the stability of operation of the urging member 60 is prioritized.

Further, the inner needle accommodating member 50b of this example is composed of a connected portion 57 on the tip end side to which the connecting portion 52 of the base member 50a is connected and a main body portion 58 on the base end side, and the main body portion 58 has an outer diameter. Both the inner diameter and the inner diameter are smaller than the connected portion 57. By forming the inner needle accommodating member 50b in such a stepped bottom cylindrical shape, the step portion 59 between the connected portion 57 and the main body portion 58 is pressed so that the inner needle accommodating member 50b is directed toward the base member 50a. Since it can be moved and fitted to the base member 50a, the assembling property can be improved. Further, since the inner peripheral surface 58a of the main body portion 58b can be configured to have substantially the same inner diameter as the second inner diameter portion 54b of the through hole 54 of the base member 50a without increasing the wall thickness, the inner needle can be formed. The base 40 and the urging member 60 can be appropriately restrained and stably moved even within the inner needle accommodating member 50b.

Further, on the outer peripheral surface of the connecting portion 52 of the base member 50a of this example, a first support outer diameter outer diameter portion 52b on the tip side (grip portion 51 side) and a second support outer diameter portion 52b on the base end side are provided. A 52c and a fitting outer diameter portion 52d between the first support outer diameter portion 52b and the second support outer diameter portion 52c are provided. The outer diameter of the first support large outer diameter portion 52b is larger than that of the second support outer diameter portion 52c, and the outer diameter of the mating outer diameter portion 52d is larger than that of the first support outer diameter portion 52b. It has a diameter. Further, between the first support outer diameter portion 52b and the fitting outer diameter portion 52d, and between the second support outer diameter portion 52c and the fitting large diameter portion 52d, intermediate taper

outer diameter portions

52e and 52f are provided. Each is provided.

Then, on the inner peripheral surface of the connected portion 57 of the inner needle accommodating member 50b, a first support inner diameter portion 57b on the tip end side, a second support inner diameter portion 57c on the proximal end side, and a first support inner diameter portion 57c are provided. A fitting inner diameter portion 57d between the 57b and the second support inner diameter portion 57c is provided. The inner diameter of the first support inner diameter portion 57b is set to be substantially the same as that of the first support outer diameter portion 52b, and the inner diameter of the second support inner diameter portion 57c is set to be substantially the same as that of the second support outer diameter portion 52c. There is. Further, the inner diameter of the fitting inner diameter portion 57d is set to be smaller than the outer diameter of the fitting outer diameter portion 52c and larger than the outer diameter of the first support inner diameter portion 57b. Further, intermediate tapered

inner diameter portions

57e and 57f are provided between the first support inner diameter portion 57b and the fitting inner diameter portion 57d, and between the second support inner diameter portion 57c and the fitting inner diameter portion 57d, respectively. ..

By configuring the connecting portion 52 and the connected portion 57 in this way, it is possible to achieve both reliable connection and assemblability of the base member 50a and the inner needle accommodating member 50b. Specifically, since the outer diameter of the second support outer diameter portion 52 is smaller than that of the first support inner diameter portion 57b, the connection portion 52 can be easily inserted into the connected portion 57, and the connection portion 52 can be easily inserted into the connected portion 57. It is possible to facilitate elastic deformation when the first support inner diameter portion 57b gets over the fitting outer diameter portion 52b. Then, in a state where the fitting outer diameter portion 52d and the intermediate taper

outer diameter portions

52e and 52f and the fitting inner diameter portion 57d and the intermediate taper

inner diameter portions

57e and 57f are fitted to each other, the first support outer diameter portions 52b and the first support outer diameter portion 52b and the second Since the support inner diameter portion 57b of 1 is arranged at a position corresponding to each other and the second support outer diameter portion 52c and the second support inner diameter portion 57c are arranged at positions corresponding to each other, a reliable connection with less rattling can be achieved. Obtainable.

In this example, the base end side of the second support outer diameter portion 52c is provided with the base end side tapered outer diameter portion 52 g whose outer diameter gradually decreases toward the base end side, and the first support inner diameter portion 57b. By providing the tip side tapered inner diameter portion 57a on the tip side in which the inner diameter gradually increases toward the tip side, the connecting portion 52 can be more easily inserted into the connected portion 57.

Although the embodiment of the present invention has been described above, the indwelling needle assembly of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. Of course.

For example, the shape and arrangement of each part of the indwelling needle assembly 1 is not limited to the shape and arrangement shown in the above embodiment, and various known shapes and arrangements can be adopted. Further, the indwelling needle assembly 1 may not have the urging member 60 and may move the inner needle base 40 manually or by gravity drop. Further, the indwelling needle assembly 1 is not limited to the one used for a living body such as a human or an animal, and may be used for a living body other than the living body.

Further, the switch member 70 is not limited to the one that moves in the direction perpendicular to the axial direction of the inner needle 30, and may move in any other direction. Further, the switch member 70 is not limited to one that directly contacts the inner needle base 40 to regulate the movement of the inner needle base 40, but regulates the movement of the inner needle base 40 via another member. There may be.

Further, the actions and effects shown in the above embodiments are merely a list of the most suitable actions and effects arising from the present invention, and the actions and effects according to the present invention are not limited thereto.

1 Indwelling needle assembly 10 Outer needle 20 Outer needle base 30 Inner needle 40 Inner needle base 50 Housing 51j Locking protrusion 70 Switch member 71 Exposed part 71a Top surface 71b Inclined surface 73a First locking groove 73b Second engagement Stop groove 74 Elastic member 80 Protector 82 First engaging protrusion 84 Tilt reduction part

Claims

With a tubular outer needle,
An outer needle base to which the base end portion of the outer needle is fixed,
The outer needle and the inner needle inserted into the outer needle base,
An inner needle base to which the base end portion of the inner needle is fixed, and
A housing that holds the outer needle base detachably and movably holds the inner needle base in the axial direction of the inner needle.
A switch member movably arranged between a restricted position for restricting the movement of the inner needle base and a release position for releasing the restriction on the movement of the inner needle base in the housing.
A protector having an engaging portion that is arranged so as to cover the outer needle and the inner needle and that restricts the movement of the switch member from the restricted position to the release position by engaging with a part of the switch member. An indwelling needle assembly characterized by:
In the indwelling needle assembly according to claim 1,
The switch member is arranged so as to move from the restricted position to the release position by moving in a direction intersecting the axial direction of the inner needle.
The engaging portion is composed of a protrusion that is continuous in the axial direction of the inner needle or protrudes in the axial direction of the inner needle, or a recess that is continuous in the axial direction of the inner needle or is recessed in the axial direction of the inner needle. An indwelling needle assembly characterized by being
In the indwelling needle assembly according to claim 1 or 2.
The switch member has an exposed portion that is exposed from the housing and is covered with the protector.
The exposed portion is an indwelling needle assembly characterized in that the top surface of the inner needle on the tip end side has an inclined surface gradually approaching the housing toward the tip end side of the inner needle.
In the indwelling needle assembly according to any one of claims 1 to 3,
The protector is an indwelling needle assembly characterized by having a tilt reducing portion that reduces its own tilt by coming into contact with the outer needle group.
In the indwelling needle assembly according to any one of claims 1 to 4,
One of the housing and the switch member has a one-sided locking portion.
The other of the housing and the switch member has a locking portion on the other side that locks on the locking portion on one side.
The indwelling needle assembly, characterized in that the one-side locking portion is provided at a position where the other-side locking portion locks when the switch member is in the restricted position.
In the indwelling needle assembly according to claim 5,
The one-side locking portion is a position where the other-side locking portion is locked when the switch member is in the restricted position, and the other-side locking portion is when the switch member is in the release position. An indwelling needle assembly characterized in that it is provided at each locking position.
In the indwelling needle assembly according to claim 5 or 6.
The one-side locking portion or the other-side locking portion moves from the restricted position to the opposite side of the released position when the switch member moves from the regulated position to the released position. An indwelling needle assembly characterized in that the lock is more easily disengaged than when the lock is used.
In the indwelling needle assembly according to any one of claims 1 to 7.
An indwelling needle assembly comprising an elastic member that elastically deforms as the switch member moves from the regulated position to the released position and urges the switch member toward the regulated position.