JP6724645B2 - Indwelling needle assembly - Google Patents

Description

The present invention relates to an indwelling needle assembly that is punctured into a blood vessel and left there for artificial dialysis, infusion or blood collection.

A closed-type indwelling needle is used when an operator performs artificial dialysis, infusion or blood collection on a patient. An example of the indwelling needle assembly is disclosed in Patent Document 1. In the indwelling needle assembly of Patent Document 1, an extension tube is connected to the side of the catheter hub, and the needle hub has a wing portion. The medical staff punctures the patient's body with the indwelling needle assembly after grasping the wings.

JP, 2013-233247, A

In the indwelling needle assembly of Patent Document 1, the medical staff holds the grip of the wing between the thumb and the index finger and punctures the needle tip at the tip of the indwelling needle assembly into the blood vessel of the patient. However, if only the wing portion is gripped, the outer needle hub moves due to the weight of the extension tube, and the posture of the indwelling needle assembly is not stable. In order to stabilize the outer needle hub, it is conceivable that the outer needle hub is grasped and punctured by the hand opposite to the hand grasping the grasping portion. In that case, the posture of the indwelling needle assembly itself is stable, but both hands must be used to stabilize it. Therefore, the skin of the patient cannot be pressed by hand, and the position and posture of the indwelling needle assembly relative to the skin of the patient are likely to be blurred. Therefore, the puncture work is not stable.

Therefore, an object of the present invention is to provide an indwelling needle assembly that can improve the stability of the posture during puncture.

The indwelling needle assembly of the present invention has an inner needle having a sharp needle tip at a distal end, a hollow outer needle through which the inner needle is inserted, and an inner hole through which the inner needle is inserted. And an outer needle hub having an outer needle hub body to which the outer needle is attached at a distal side opening, and a tube attachment portion provided to the side of the outer needle hub body and having a tube attached thereto, An inner needle hub that is provided on the proximal end side of the inner needle protruding from the needle hub and is relatively displaceable with respect to the outer needle hub. An inner needle hub body attached to the proximal end portion, and a wing portion provided on the inner needle hub body and extending distally from the inner needle hub body, the wing portion comprising: There is a plate-shaped gripping portion located on the distal side of the wing portion and having gripping surfaces on both sides, the gripping portion is located in the vicinity of the outer needle hub, and the outer needle hub is the outer needle. A non-slip portion is provided on the outer peripheral surface of the hub, and the non-slip portion is located near the grip portion.

According to the present invention, since the grip portion is arranged in the vicinity of the outer needle hub body, when the grip portion is gripped, the outer needle hub body can also be stably gripped by a part of the gripped finger. Further, by arranging the non-slip portion of the outer needle hub in the vicinity of the grip portion, it is possible to grasp the outer needle hub with a part of the finger while a part of the grasped finger is in contact with the anti-slip portion. You can As a result, it is possible to prevent a part of the finger from slipping on the outer needle hub when gripped, and to prevent the indwelling needle assembly from shaking. That is, the stability of the posture at the time of puncturing can be improved.

According to the present invention, the stability of the posture at the time of puncturing can be increased.

It is a top view which shows the indwelling needle assembly of 1st Embodiment of this invention. FIG. 2 is a cross-sectional view of the indwelling needle assembly of FIG. 1 taken along a virtual cross section that includes the axis thereof and is parallel to the paper surface. It is the right view which looked at the indwelling needle assembly of FIG. 1 from the right side. FIG. 4 is a cross-sectional view of the indwelling needle assembly of FIG. 1 taken along a cutting line IV-IV. It is a perspective sectional view of the indwelling needle assembly of FIG. It is sectional drawing which shows the indwelling needle assembly of 2nd Embodiment of this invention.

Hereinafter, a closed type indwelling needle 1, 1A which is an example of an indwelling needle assembly according to the first and second embodiments of the present invention will be described with reference to the drawings. In addition, the concept of the direction used in the following description is used for convenience of description, and the direction of the configuration of the invention is not limited to the direction. The closed indwelling needles 1 and 1A described below are merely one embodiment of the present invention. Therefore, the present invention is not limited to the embodiments, and additions, deletions, and changes can be made without departing from the spirit of the invention.

[First Embodiment]
The closed-type indwelling needle 1 of the first embodiment shown in FIG. 1 is used when a needle is punctured in a blood vessel or the like for indwelling, and a drug solution is administered into the blood vessel by the needle or blood is collected from the blood vessel. To be The closed indwelling needle 1 includes an indwelling needle main body 2, a tube 3, and a connector 4. In the following description, the site distal to the practitioner who performs the needle puncture work on the patient with the closed indwelling needle 1 will be referred to as the distal end, and the site proximal to the practitioner will be referred to as the proximal end. I am calling it. That is, the distal side is the tip side and the proximal side is the base side.

The indwelling needle body 2 has an outer needle hub 11, an outer needle 12, an inner needle 13, and an inner needle hub 14. The outer needle hub 11 is a Y-shaped member made of synthetic resin, has a main body portion 21, and has a tube mounting portion 22 on the peripheral surface of the main body portion 21. The main body portion 21, which is an example of the outer needle hub main body, is formed in a substantially cylindrical shape, and the outer peripheral surface of the tip portion is formed in a taper shape that tapers toward the tip. As shown in FIG. 2, the main body portion 21 has an inner hole 21a penetrating it along the axis L1. A hemostatic rubber 5 is fitted in the axially intermediate region of the inner hole 21a, and the inner hole 21a is divided by the hemostatic rubber 5 into a distal space 21b and a proximal space 21c. The hemostatic rubber 5 is a solid, generally cylindrical member made of synthetic rubber such as polyisoprene or a thermoplastic elastomer, and seals the spaces 21b and 21c described above. A tube mounting portion 22 is integrally provided on the outer peripheral surface of the intermediate portion of the main body portion 21, and the tube 3 is mounted on the tube mounting portion 22.

The tube attachment portion 22 obliquely extends toward the base end side of the main body portion 21 so as to be separated from the outer peripheral surface (side surface) of the intermediate portion of the main body portion 21 to one side in the radial direction. That is, the tube attachment portion 22 is located at an intermediate portion of the outer needle hub 11 and extends from the outer peripheral surface (side surface) of the main body portion 21 to the rear oblique left side. The tube mounting portion 22 is formed in a substantially cylindrical shape and has a communication passage 22a which is an inner hole thereof. The communication passage 22a extends along the axis of the tube mounting portion 22, one end of which is connected to the distal end side space 21b, and the other end of which the one end of the tube 3 is inserted. The tube 3 has flexibility, and the connector 4 is provided at the other end.

The connector 4 is formed in a Y shape and has an injection plug 23 and a connecting portion 24. A syringe with a needle (not shown) is connected to the injection plug 23. The connecting portion 24 is adapted to be able to connect an infusion set, a blood collecting set, and the like, which are not shown, and is closed by a cap member 25. As described above, in the closed indwelling needle 1, an infusion set, a blood collection set, a syringe with a needle, and the like can be attached to the connector 4. The attached infusion set, blood collection set, syringe with needle, and the like are connected to the distal end side space 21b of the main body portion 21 via the connector 4 and the tube 3. Further, the outer needle 12 is inserted and fixed in the opening portion on the distal end side of the main body portion 21.

The outer needle 12 is a generally cylindrical thin tube made of a flexible soft synthetic resin such as ethylene-tetrafluoroethylene copolymerization, polyurethane, polyether nylon, or polypropylene. The proximal end portion of the outer needle 12 is inserted into and fixed to the distal end side opening portion of the outer needle hub 11. The outer needle 12 has an insertion hole 12a that is an inner hole, and the inner needle 13 is inserted into the insertion hole 12a.

The inner needle 13 is a substantially cylindrical hollow needle made of, for example, a metal material or a hard synthetic resin, and extends straight along the axis L1. The inner needle 13 penetrates through the inner hole 21 a of the outer needle hub 11 so as to penetrate the hemostatic rubber 5, and the distal end side portion and the proximal end side portion thereof project from the outer needle hub 11. The inner needle 13 has a sharp needle tip 13a formed so as to be able to puncture a blood vessel at the tip, and the inner needle 13 has a blade surface 13b that is cut obliquely to the axis L1 at the needle tip 13a. Have An inner needle hub 14 is provided at the base end of the inner needle 13.

The inner needle hub 14 is formed in a substantially columnar shape, and is configured to be relatively displaceable with respect to the outer needle hub 11. That is, the inner needle hub 14 can be relatively displaced proximally to be pulled away from the outer needle hub 11, and the inner needle 13 can be pulled out from the outer needle 12 by pulling it away (two points in FIG. 2). See the chain line). The inner needle hub 14 having such a function has an inner needle hub body 31 and a wing portion 32.

The inner needle hub body 31 is a bottomed tubular member configured by closing the proximal end side opening of the substantially cylindrical portion 31a with a cap 31b. The inner needle hub body 31 has a mounting portion 14a therein, and the base end portion of the inner needle 13 is inserted into and fixed to the mounting portion 14a. The inner needle 13 projects from the distal end portion of the inner needle hub body 31 and extends along the axis L1. The inner needle hub main body 31 thus configured is arranged on the proximal end side of the main body portion 21 so that the distal end thereof abuts on the proximal end of the main body portion 21, and the outer peripheral surface thereof has a wing portion. 32 is integrally formed.

The wing portion 32 is a portion that the operator holds with two fingers (for example, the thumb T1 and the index finger T2) at the time of puncturing and when pulling out the inner needle 13. The wing portion 32 is formed in a plate shape thinner than the outer needle hub 11, and is formed in a substantially drop shape when viewed in the thickness direction. The wing portion 32 is integrally provided on a distal end side portion of the outer peripheral surface of the inner needle hub body 31, and projects from the outer peripheral surface to the diagonally right front side. More specifically, the wing portion 32 has a connecting portion 32a and a grip portion 32b, and is formed in a generally teardrop shape by these. The connecting portion 32a is formed in a substantially triangular shape in a plan view, and the grip portion 32b is formed in a substantially circular shape in a plan view.

The wing portion 32 is provided on the outer peripheral surface so that a part of one side of the connecting portion 32a is integrated with the outer peripheral surface of the inner needle hub main body 31 and protrudes obliquely to the tip side and the other side in the radial direction, and to the front oblique right side. Has been. The grip portion 32b is provided at the tip of the connecting portion 32a and is located on the tip side of the wing portion 32. As a result, the grip portion 32b comes to be located closer to the tip end side than the inner needle hub body 31, and is located near the outer needle hub 11. More specifically, the grip portion 32b is arranged on the right side of the middle portion of the outer needle hub 11, that is, on the opposite side of the tube 3 (more specifically, the tube mounting portion 22) with the body portion 21 interposed therebetween.

Further, the grip portion 32b rises obliquely upward so as to separate from the tube 3 when the blade surface 13b of the needle tip 13a of the inner needle 13 is directed upward in the gravity direction. That is, the grip portion 32b rises obliquely to the upper right when the blade surface 13b of the needle tip 13a of the inner needle 13 is directed upward in the gravity direction. Note that FIG. 2 shows the wing portion 32 in the leftward and rightward direction for convenience of description, and the same applies to FIGS. 3 to 6. The grip portion 32b arranged in this manner is close to the outer needle hub 11 and has a slight gap (for example, 1.5 mm or less) between the outer needle hub 11 and a gap of about 0.5 mm in the present embodiment. It is placed open. With this arrangement, the grip portion 32b can be gripped and two fingers can be attached to the intermediate portion of the outer needle hub 11, and when the inner needle hub 14 is pulled down, the outer needle hub 11 and the wing portion 32 can be pulled down. It is possible to prevent the resistance from being hit by.

In the closed indwelling needle 1 configured in this way, the closed indwelling needle 1 can be firmly held by holding the grip portion 32b and attaching it to the intermediate portion of the outer needle hub 11 with two fingers. The stability of the closed indwelling needle 1 at the time of puncturing can be improved. Further, the grip portion 32b has the following shape so that it can be easily gripped.

That is, the gripping portion 32b is designed to be gripped by the ball of two fingers, and as shown in FIG. It is formed to have an increased thickness (see also FIGS. 4 and 5). That is, as shown in FIG. 4, the gripping surfaces 32c and 32d above and below (that is, in the thickness direction) the gripping portion 32b are both substantially lower in the right diagonal rear side portion of the outer edge and highest in the left diagonal front side of the outer edge. It is formed in a shape. That is, the holding surfaces 32c and 32d are formed with a recess so that the ball of the finger can be easily placed. Further, the valley line of the recess extends obliquely leftward and forward from the right rear portion of the outer edge through the center of the grip portion 32b, so that the operator can place the finger on the grip portion 32b along the valley line. Can be urged.

Further, as can be seen from FIG. 5 in which the grip portion 32b is cut along the valley line, the grip surfaces 32c and 32d of the grip portion 32b are formed in conformity with the shape of the tip side of the finger, that is, The inclination of the region on the diagonally left front side is larger than that on the diagonally right rear side. Further, the grip surfaces 32c and 32d of the grip portion 32b are inclined toward the outer peripheral surface of the outer needle hub 11 (more specifically, a mounting portion 27 described later). That is, the outer peripheral surface of the outer needle hub 11 is located on or near the extension line of the region on the diagonally left front side of the gripping surfaces 32c and 32d (see the chain double-dashed line in FIG. 4). As a result, when the finger pad is placed on the grip portion 32b, the tip of the finger is naturally arranged on the outer peripheral surface of the outer needle hub 11.

Further, as shown in FIGS. 4 and 5, an annular convex strip 33 is formed around the center of the grip portion 32b. The ridge 33 is formed so as to project on each of the grip surfaces 32c and 32d, and is designed so as not to slip on a finger (more specifically, a finger pad) placed on the grip portion 32b. The ridge 33 does not necessarily have to be annular, and a plurality of linearly formed protrusions may be formed at predetermined intervals. The effect of the present application occurs when a non-slip portion, which will be described later, hits the tip of each finger holding the grip portion 32b during puncturing. Therefore, the anti-slip part may be formed so as to sandwich the gripping portion 32b during puncturing (that is, on the outer peripheral surface of the outer needle hub 11 on one side and the other side in the circumferential direction with respect to the gripping portion 32b). Further, even if an annular groove is formed around the center of the grip portion 32b, the same effect as that of the ridge 33 can be exhibited.

As described above, the gripping portion 32b having such a shape allows the operator to grip the finger along the valley line, and by forming it in a bowl shape, the belly of the finger is placed in the recess. Making it easier. In addition, since the inclination of the region on the diagonally left front side of the gripping surfaces 32c and 32d is directed toward the outer peripheral surface of the outer needle hub 11, it is easy to place the tip portion of the finger on the intermediate portion of the outer peripheral surface of the outer needle hub 11. .. Further, a mounting portion 27 as shown in FIG. 1 is formed at an intermediate portion of the outer peripheral surface of the outer needle hub 11.

The placing portion 27 is a portion for placing the tip portion of the operator's finger, that is, the operator's fingertip. The mounting portion 27 is located in the vicinity of the grip portion 32b of the wing portion 32, and facilitates the placement of the tip of a finger that grips the grip surfaces 32c and 32d. Further, the placing portion 27 is formed in a concavo-convex shape and constitutes a non-slip portion that prevents the fingertip placed thereon from slipping. Specifically, the mounting portion 27 is configured by three ridge portions 27a to 27c, and the ridge portions 27a to 27c are arranged on the outer peripheral surface of the main body portion 21 at equal intervals in the front-rear direction. There is. The ridges 27a to 27c are bridged from the upper side of the tube mounting portion 22 to the main body portion 21, further around the right half surface of the outer peripheral surface of the main body portion 21, and further below the main body portion 21 again. It has been bridged over 22. Thus, the ridges 27a to 27c are formed on the main body portion 21 so as to bridge the upper and lower surfaces of the main body portion 21. The tops of the ridges 27a to 27c are formed flat so that the operator's fingertips can be placed thereon. Furthermore, by disposing the ridges 27a to 27c at intervals, it is possible to prevent unevenness from being formed on the outer peripheral surface of the outer needle hub 11 and to prevent the fingertip from sliding in the front-back direction. The configuration of the mounting portion 27 is not limited to the above-described configuration, and may be formed by providing a plurality of small dome-shaped projections on the outer peripheral surface of the outer needle hub 11, for example.

In the closed indwelling needle 1 configured as described above, the wing portion 32 extends from the inner needle hub body 31 to the intermediate portion of the outer needle hub 11 and is adjacent to the intermediate portion. Accordingly, when the grip portion 32b is gripped, the outer needle hub 11 can be stably gripped by a part of the gripped finger. Further, by disposing the placing portion 27 of the outer needle hub 11 in the vicinity of the grip portion 32b, the outer needle hub can be partially held by the outer needle hub while a portion of the grasped finger is placed on the placing portion 27. 11 can be gripped. Accordingly, when the outer needle hub 11 is mounted on the mounting portion 27 and is gripped, it is possible to prevent a part of the finger from being displaced on the outer needle hub 11, and to prevent the sealed indwelling needle 1 from blurring. Can be suppressed. That is, the stability of the posture at the time of puncturing can be improved.

Further, in the closed indwelling needle 1, the wing portion 32 is integrally provided on the distal end side portion of the inner needle hub body 31 so that the closed indwelling needle 1 has the extending portion 31c extending proximally from the wing portion 32 of the inner needle hub body 31. It has become. The extending portion 31c has a width substantially equal to that of the distal end side of the inner needle hub body 31 and extends integrally in the proximal direction along the axial direction, and the length in the axial direction (that is, the extending direction) is the axial direction of the blade portion 32. Is about twice as long. In the present embodiment, the extending portion 31c extends from the mounting portion 27 to a position 40 mm, for example. Further, the length of the extending portion 31c is preferably such that the base end of the extending portion 31c is separated from the mounting portion 27 by 20 mm or more and 50 mm or less. If the base end of the extension part 31c is about 40 mm or more and 50 mm or less from the mounting part 27, the closed type indwelling needle 1 can be fixed by placing the base end of the extension part 31c on the palm. When the base end of the extending portion 31c is less than 20 mm from the placing portion 27, it becomes difficult to attach the middle finger to the extending portion 31c. Therefore, the extending portion 31c preferably extends from the mounting portion 27 to a position of 20 to 50 mm.

By forming the extending portion 31c in the inner needle hub body 31 in this manner, the belly of the operator's fingers (for example, the middle finger T3 and the ring finger T4) that the operator does not grasp can be applied to the lower side of the outer peripheral surface of the extending portion 31c. .. By doing so, the proximal end portion of the indwelling needle main body 2 can be supported by the finger not grasped, and the vertical stability of the indwelling needle main body 2 at the time of puncturing and pulling out the needle can be improved. Further, since the proximal end portion of the extending portion 31c can be supported by the palm of the hand to support the indwelling needle main body 2, even when the closed indwelling needle 1 is accidentally hit by an object or the like, the needle of the closed indwelling needle 1 It is possible to prevent the tip 13a from shaking.

Below, the operation|work at the time of puncturing the closed type indwelling needle 1 and pulling out the inner needle 13 from the outer needle 12 is demonstrated. As shown in FIG. 1, the closed indwelling needle 1 is in a state in which the base end of the outer needle hub 11 and the tip of the inner needle hub 14 are in contact with each other, and the needle tip 13 a of the inner needle 13 projects from the tip of the outer needle 12. Used in. Further, in the closed type indwelling needle 1, the inner needle hub 14 is configured to be rotatable about the axis with respect to the outer needle hub 11, and the wing portion 32 sandwiches the main body portion 21 and is opposite to the tube mounting portion 22. That is, the inner needle hub 14 is rotated so as to be located on the right side. By doing so, the blade surface 13b of the needle tip 13a faces upward in a plan view. In the closed indwelling needle 1, the wing portion 32 rises upward and obliquely to the right 45 degrees as shown in FIG. 1 with the blade surface 13b of the needle tip 13a facing upward in the direction of gravity. The operator holds the wing portion 32 in this state.

When gripping, the wings 32 are gripped by two fingers, in the present embodiment, the belly of the thumb T1 and the index finger T2, and the tips of the thumb T1 and the index finger T2 are placed on the mounting portion 27 from the upper and lower diagonal sides. Place it. As a result, the middle portion of the outer needle hub 11 can be grasped by the tips of the thumb T1 and the index finger T2, and the left and right blurring of the indwelling needle body 2 can be suppressed. Further, the middle finger T3 and the ring finger T4 are made to contact the lower side of the extending portion 31c to support the inner needle hub 14. As a result, the vertical movement of the indwelling needle body 2 can be suppressed. The operator holds the indwelling indwelling needle 1 in such a state that the blurring in the vertical and horizontal directions is suppressed, that is, in a stable posture, and punctures the blood vessel of the patient with the inner needle 13 in this state. In the closed indwelling needle 1, as described above, when the blade surface 13b of the needle tip 13a is directed upward, the wing portion 32 rises upward and at an angle of 45 degrees to the right. Therefore, it is possible to prevent the lower finger gripping the grip portion 32b at the time of puncturing, that is, the fingertip of the index finger T2 in the present embodiment from hitting a site near the puncturing site of the patient.

After the puncture, the inner needle 13 is pulled out from the outer needle 12 in order to collect blood or flow infusion into a blood vessel. When the inner needle 13 is pulled out, the thumb T1 and the index finger T2 move their tips away from the placement portion 27 while supporting the lower side of the extension portion 31c by the middle finger T3 and the ring finger T4, as in the case of puncturing. Only the wings 32 are gripped. On the upper surface of the tube attaching portion 22 of the placing portion 27, a finger of the hand opposite to the hand holding the wing portion 32 is placed, and the outer needle hub 11 is pressed against the skin of the patient by the finger. The operator moves the hand holding the wing portion 32 to the proximal side (see the chain double-dashed line in FIG. 2) while pressing the inner needle hub 14 away from the outer needle hub 11. By doing so, after the needle tip 13a of the inner needle 13 is retracted into the outer needle 12, it is further withdrawn from the outer needle 12 and the hemostatic rubber 5, and finally withdrawn from the main body portion 21 as well. As a result, the inner needle 13 can be separated from the outer needle hub 11.

As described above, in the closed indwelling needle 1, since the inner needle hub main body 31 extends proximally from the wing portion 32, the fingers are lowered to the extending portion which is extended while grasping the grasping portion with two fingers. It can be supported from the side. As a result, the indwelling needle main body 2 can be supported by two points that are separated from each other in the front-rear direction, so that it is possible to suppress vertical blurring. That is, it is possible to improve the stability of the posture during puncture and during needle removal.

Further, in the closed type indwelling needle 1, the length of the extending portion 31c is about twice the length of the wing portion 32 and extends from the anti-slip portion to the position of at least 40 mm on the proximal side. Two fingers, T3 and ring finger T4, are applied to the extending portion 31c so as to be easily supported. By making it possible to apply a plurality of fingers in this way, it is possible to further improve the stability of the posture during puncture and during needle removal.

In addition, in the present embodiment, the length of the extending portion 31c is about twice the length of the blade portion 32, but may be three times. In consideration of the number of fingers that can be applied, it is preferable that the length is at least twice the length of the wing portion 32. Considering that the base end of the extending portion 31c hits the palm when gripped, the wing It is preferable that the length is not more than 3 times the length of the portion 32. Therefore, the length of the extending portion 31c is preferably 2 times or more and 3 times or less that of the wing portion 32, but the length of the extending portion 31c is not necessarily limited to such a range. Further, the extending portion 31c does not necessarily need to extend from the placing portion 27 to the position of 40 mm, and if it extends to the position of 25 mm, for example, at least the belly of the middle finger T3 can be applied to the extending portion 31c. .. This alone can improve the stability of the indwelling needle body 2 in the vertical direction during puncture and needle removal.

Further, in the closed type indwelling needle 1, the mounting portion 27 is formed in the intermediate portion of the outer peripheral surface of the outer needle hub 11, and the wing portion 32 is extended to a position adjacent to the mounting portion 27. This allows the finger to hold the wing portion 32 and place the finger on the placing portion 27. That is, the closed indwelling needle 1 can be supported at three points of the placing portion 27 in addition to the wing portion 32 and the extending portion 31c, and the stability of the posture at the time of puncturing can be improved. In addition, since the placing portion 27 on which the finger is placed is formed in an uneven shape, the displacement of the fingertip can be suppressed.

Further, in the closed type indwelling needle 1, the tube attachment portion 22 projects from the outer peripheral surface to one side in the radial direction at the intermediate portion of the outer peripheral surface of the outer needle hub 11, and the ridge portions 27a to 27c are formed at the intermediate portion. ing. Therefore, since the protruding portion and the protruding portion are gathered in one place, the outer needle hub 11 can be easily molded. In the closed indwelling needle 1, the ridges 27a to 27c are formed so as to extend from the upper side of the tube mounting portion 22 around the right half surface of the outer peripheral surface of the main body portion 21 to the lower side of the tube mounting portion 22. There is. Therefore, the number of molding points can be reduced, and the outer needle hub 11 can be easily molded, as compared with the case where the tube mounting section 22 is formed separately from the upper and lower sides and the outer peripheral surface of the main body portion 21. Further, the outer needle hub 11 can be easily formed by forming the mounting portion 27 with the protruding portions 27a to 27c.

<Second Embodiment>
The closed-type indwelling needle 1A of the second embodiment is similar in configuration to the closed-type indwelling needle 1 of the first embodiment. Hereinafter, the configuration of the hermetically sealed indwelling needle 1A of the second embodiment will be mainly described with respect to the points different from the hermetically sealed indwelling needle 1 of the first embodiment, and the same components will be denoted by the same reference numerals and illustrated and described. Is omitted.

As shown in FIG. 7, the closed indwelling needle 1A includes an indwelling needle main body 2A, a tube 3, and a connector 4. The indwelling needle body 2A has a protector 40 in addition to the outer needle hub 11, the outer needle 12, the inner needle 13, and the inner needle hub 14. The protector 40 is partially housed inside the outer needle hub 11 and closer to the proximal end side than the hemostatic rubber 5. When the inner needle 13 is pulled out from the outer needle 12 and the outer needle hub 11, the protector 40 is covered and protected. It is supposed to do. The protector 40 having such a function has a protector body 41 and a holder 42.

The protector body 41 is made of various metal materials such as stainless steel, aluminum, aluminum alloys, titanium, titanium alloys, copper, and copper alloys, and is a box-shaped member having a substantially rectangular shape extending in the axial direction. A passage hole for passing an inner needle is formed in the front end plate and the base end plate of the box-shaped member, and flexible side plates 43 and 44 facing left and right from the front end plate extend in the front end direction, and between them. The inner needle 13 is inserted through. In addition, an engaging portion (not shown) is formed on the tip side portion of the inner needle 13, and the engaging portion pulls out the inner needle 13 so that the needle tip 13a fits between the two flexible side plates 43 and 44. And engages with the protector body 41. As a result, the protector main body 41 moves integrally with the inner needle 13 when the needle tip 13a fits between the two flexible side plates 43 and 44. Further, the protector body 41 is housed in a holder 42 having a substantially cylindrical shape.

The holder 42 accommodates the protector main body 41 in a relative displacement backward relative to the holder 42. When the protector main body 41 is pulled rearward while being engaged with the engaging portion of the inner needle 13, the protector main body 41 is held together with the inner needle 13. It can be pushed rearward in 42. Further, the two flexible side plates 43, 44 of the protector main body 41 are formed so as to be slightly expanded in the radial direction, and by pushing the protector main body 41 rearward in the holder 42, the two flexible side plates 43, 44 are formed. 44 is pushed down inward. Further, hook-shaped portions 43a and 44a are formed at the tip end portions of the two flexible side plates 43 and 44, and the two flexible side plates 43 and 44 are engaged with each other by being pushed inward. By doing so, the needle tip 13a is covered and protected by the two hook-shaped portions 43a and 44a. Therefore, by pulling out the inner needle 13 to the proximal side, the needle tip 13a is protected by the hook-shaped portions 43a and 44a.

The protector 40 configured in this manner has a distal end side portion inserted into the proximal end side space 21c of the main body portion 21 of the outer needle hub 11. In addition, an engagement groove 21d is formed on the inner peripheral surface of the main body portion 21 on the proximal side of the mounting portion 27 over the entire circumference in the circumferential direction, and the holder 42 of the protector 40 corresponds to the engagement groove 21d. It has a pair of front and rear engaging pieces 42a at the positions. The engaging pieces 42a are arranged at the front end portion of the holder 42 so as to be separated from each other in the front-rear direction, and the front end portions thereof project in the radial direction. When the tip end side portion of the protector 40 is inserted into the base end side space 21c, the protruding portion of the engagement piece 42a enters into the engagement groove 21d and engages. By engaging in this way, the protector 40 is prevented from coming off the main body portion 21 with a small load.

On the other hand, the base end side part of the protector 40, that is, the base end side part of the holder 42 projects from the outer needle hub 11, and these parts are housed in the inner hole 14 b of the inner needle hub 14. The base end side portion of the holder 42 is formed in substantially the same shape as the inner hole 14b of the inner needle hub 14, and the base end side portion of the holder 42 is fitted into the inner hole 14b with almost no rattling. ..

Since the closed indwelling needle 1A configured as described above is provided with the protector 40, it is possible to prevent the needle tip 13a from being exposed when the inner needle 13 is pulled out. Further, since the base end portion of the protector 40 is fitted into the inner hole 14b of the inner needle hub 14, when the inner needle 13 is pulled backward and the needle tip 13a is housed in the outer needle 12, the base of the protector 40 is retracted. It can be used as a guide to the end portion. As a result, when the inner needle 13 is pulled backward and the needle tip 13a is housed in the outer needle 12, it is possible to suppress the blurring of the inner needle 13 in the vertical and horizontal directions.

In the closed indwelling needle 1A, in the region from the position where the grip portion 32b is adjacent to the main body portion 21 of the outer needle hub 11 to the position where the wing portion 32 of the inner needle hub 14 is provided, that is, in the axial direction. The protector 40 is arranged in the region where the wing portion 32 extends. Therefore, it is not necessary to extend the indwelling indwelling needle 1A for the protector 40, and it is possible to prevent the outer dimension of the indwelling indwelling needle 1A, particularly, the length from increasing.

Further, the closed indwelling needle 1A has an engagement groove 21d on the inner peripheral surface of the body portion 21 on the proximal side of the mounting portion 27. That is, since the engagement groove 21d can be formed apart from the mounting portion 27, the outer needle hub 11A can be formed more easily than when the mounting portion 27 and the engagement groove 21d overlap each other radially inward. It is possible to suppress defects.

In addition, the closed-type indwelling needle 1A of the second embodiment has the same operational effect as the closed-type indwelling needle 1 of the first embodiment.

[Other Embodiments]
In the closed type indwelling needles 1 and 1A of the first and second embodiments, the placing portion 27 is configured by the ridges 27a to 27c that are the friction coefficient increasing portions, but only the protrusion-like ones are used. Instead, it may be made of silicone or rubber so as to be attached to the skin (for example, like a suction cup), or may be formed by performing satin finish. The mounting portion 27 does not necessarily have to be the friction coefficient increasing portion, and may be the outer peripheral surface of the outer needle hub 11 as it is, or may be a flatly formed portion.

Further, in the closed type indwelling needles 1 and 1A of the first and second embodiments, the wing portion 32 is formed in a substantially drop shape, but it is not necessarily required to have such a shape. For example, the connecting portion 32a may be formed in a rod shape, and the grip portion 32b may be formed in a substantially elliptical shape, a substantially quadrangular shape, or a substantially triangular shape in a plan view.
Further, the tip of the inner needle may have a conical shape so that the blade surface is not formed.

1, 1A Closed type indwelling needle 11 Outer needle hub 12 Outer needle 12a Insertion hole 13 Inner needle 13a Needle tip 14 Inner needle hub 27 Placement section 31 Inner needle hub body 31c Extending section 32 Gripping section 32c, 32d Gripping surface 40 Protector

Claims (11)

An inner needle having a sharp needle tip at the distal end,
A hollow outer needle through which the inner needle is inserted,
An outer needle hub body having an inner hole through which the inner needle is inserted and having the outer needle attached to a distal opening, and a tube provided on a peripheral surface of the outer needle hub body and having a tube attached thereto An outer needle hub having a mounting portion,
An inner needle hub provided on the proximal end side of the inner needle protruding from the outer needle hub, the inner needle hub being relatively displaceable with respect to the outer needle hub,
The inner needle hub includes an inner needle hub body to which the inner needle is attached at a distal end portion, and a wing portion provided on the inner needle hub body and projecting distally from the inner needle hub body. Has and
The wing has a plate-shaped gripping portion located on the distal side of the wing and having gripping surfaces on both sides,
The grip portion is located near the outer needle hub body,
The outer needle hub body has a non-slip portion on the outer peripheral surface of the outer needle hub body,
The slip preventing portion is located in the vicinity of the grip portion,
The indwelling needle assembly , wherein the grip portion is formed so as to become thicker toward the anti-slip portion, and the grip surface is inclined toward the anti-slip portion . The inner needle has a blade surface on the needle tip,
The gripping portion rises obliquely upward to the side so as to separate from the tube mounting portion when the blade surface is directed upward in the gravity direction,
The indwelling needle assembly according to claim 1, wherein the non-slip portion is formed at least at a position sandwiching the gripped portion when the blade surface is directed upward in the gravity direction. The tube mounting portion is provided in an intermediate portion of the outer needle hub body,
The indwelling needle assembly according to claim 1, wherein the non-slip portion is formed in an intermediate portion of the outer needle hub body. The indwelling needle assembly according to claim 3, wherein the non-slip portion is also formed on an upper surface of the tube attachment portion. The indwelling needle assembly according to any one of claims 1 to 4, wherein the non-slip portion is formed so as to project from an outer peripheral surface of the outer needle hub body. The indwelling needle assembly according to any one of claims 1 to 5, wherein the inner needle hub body has an extending portion extending from the wing portion toward a proximal side. The indwelling needle assembly according to claim 6, wherein the extending portion extends from the anti-slip portion to a position of at least 25 mm toward a proximal end side. The indwelling needle assembly according to claim 8, wherein the extending portion extends from the anti-slip portion to a position of at least 40 mm on the proximal end side. The length of the extending portion in the extending direction is formed so as to be 2 times or more and 3 times or less than the length of the gripping portion in the extending direction. Indwelling needle assembly. A protector that is inserted into each of the outer needle hub and the inner needle hub, and that protects the needle tip of the inner needle when pulled out from the outer needle hub together with the inner needle,
The protector has a passage hole through which the inner needle passes, and the passage hole is arranged between the anti-slip portion and a connection portion between the main body of the inner needle hub and the wing portion. The indwelling needle assembly according to any one of claims 1 to 9 . A protector that is inserted into the outer needle hub and protects the needle tip of the inner needle when pulled out from the outer needle hub together with the inner needle;
The outer needle hub has an engagement groove on the inner peripheral surface of the outer needle hub on the proximal side of the slip prevention portion,
The indwelling needle assembly according to any one of claims 1 to 10 , wherein the protector has an engaging piece that engages with the engaging groove in a state of being inserted into the outer needle hub.