JP2018126452A - Indwelling needle assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indwelling needle assembly with which, when blood is filled to remove air in a plunger, the timing of closing a sealing member corresponding a hemostatic valve is easily known.SOLUTION: An indwelling needle assembly 1 comprises: an inner needle 11; an inner-needle hub 12; an outer needle 15; a cylindrical outer-needle hub 16; a sealing member 17 arranged to separate the interior of the outer-needle hub into a distal region and a proximal region and to provide a sealing therebetween; a cylindrical plunger 18 arranged inside the outer-needle hub and movable between a closed position and an open position to push the sealing member open; and a cylindrical operation member 4 which is operated to abut against a proximal end surface of the plunger and to push the plunger such that the plunger is moved to the open position. At least a portion of the outer-needle hub which covers the proximal end surface of the plunger is transparent. At least one of the plunger and the operation member is transparent to allow viewing of the inside thereof. The plunger and the operation member are communicatable with each other in the inner holes thereof such that the proximal end surface of the plunger can be recognized.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an indwelling needle assembly that is punctured into a blood vessel or the like and indwelled.

  When performing hemodialysis or the like, an indwelling needle assembly is used, and an indwelling needle catheter as in Patent Document 1 is known as an example of an indwelling needle assembly. In the indwelling needle catheter of patent document 1, the catheter base is attached to the proximal end part of the tube. A hemostasis valve and a pusher are provided in the catheter base, and the catheter base is separated into a proximal region and a distal region by the hemostasis valve. Further, the hemostasis valve is expanded by a pusher, and the two regions communicate with each other by being expanded. An inner needle is inserted through the catheter base through the proximal opening. The inner needle passes through the pusher and the hemostasis valve and is inserted into the tube from the distal opening, and the sharp needle tip projects outward from the tube. The inner needle arranged in this way can be pulled out from the catheter base, and a male connector such as a syringe can be inserted into the proximal opening of the catheter base after the inner needle is pulled out. Yes. Further, the pusher can be pushed toward the hemostasis valve by the inserted syringe, and the pusher pushes the hemostasis valve by pushing. Thereby, a tube and the inside of a syringe are connected via a pusher.

International Publication No. 2013/051242

  In the indwelling needle catheter of Patent Document 1, the inside of the pusher is filled with air before the hemostasis valve is opened because the catheter base is separated by the hemostasis valve into the distal region and the proximal region. . Therefore, if the syringe is pushed into the catheter base as it is and the hemostasis valve is pushed open, the air in the pusher flows into the syringe together with the blood. In order to avoid such a situation, in the indwelling needle catheter, it is preferable to insert the male connector into the proximal opening of the catheter base after performing the work of extracting the air from the pusher in advance. The inventor has considered the following method for removing air.

  That is, a cylindrical actuating member is inserted from the open end on the proximal side of the catheter base, and the pusher is pushed by the actuating member. As a result, the hemostasis valve is pushed open, and the blood in the catheter base flows into the pusher. Then, the inside of the pusher is filled with blood while adjusting the pushing amount, the pushing timing, etc., and the air in the pusher is pushed out into the working member. However, the amount of push-in when filling with blood and the timing of pushing and releasing depend on the practitioner. If they are mistaken (especially the timing of releasing), the blood in the pusher flows out to the operating member.

  Therefore, an object of the present invention is to provide an indwelling needle assembly that can make it easy to understand the timing of closing a sealing member corresponding to a hemostasis valve when filling blood to remove air in a pusher. .

  The indwelling needle assembly of the present invention includes an inner needle having a sharp needle tip on the distal side, an inner needle hub provided on the proximal side of the inner needle, and an outer needle through which the inner needle is inserted. And a cylindrical outer needle hub in which the outer needle is attached to the distal opening and the inner needle is inserted, and the inner needle is disposed in the outer needle hub in a state of passing through the inner needle, A sealing member that divides the outer needle hub into a distal region and a proximal region and seals between them, and is disposed in the outer needle hub, and is located proximal to the sealing member A cylindrical position that is movable between a closed position that is distal to the closed position and an open position that pushes open the sealing member to communicate the distal region and the proximal region. A pusher and a cylindrical actuating member that contacts the proximal end surface of the pusher and is operated to push the pusher and move it to the open position. The outer needle hub has transparency so that at least a portion covering the proximal end surface of the pusher has transparency, and at least one of the pusher and the actuating member has transparency so that the inside can be visually recognized. The pusher and the actuating member are configured such that their inner holes communicate with each other at the proximal end face of the pusher and the proximal end face of the pusher can be identified with respect to the actuating member. It is what.

  According to the present invention, the practitioner can easily identify the proximal end surface of the pusher, and therefore it is possible to easily understand the timing at which the pusher that is actuated to the open position by the actuating member is to be returned to the closed position. That is, the timing for closing the sealing member can be easily understood.

  According to the present invention, it is possible to easily understand the timing for closing the sealing member when filling the blood to remove the air in the pusher.

It is a cross-sectional perspective view in the indwelling needle assembly of 1st Embodiment of this invention. FIG. 2 is an enlarged perspective cross-sectional view showing the vicinity of a pusher and a luer cap of the indwelling needle assembly of FIG. 1 in an enlarged manner. FIG. 2 is an exploded cross-sectional view illustrating a state where the indwelling needle assembly of FIG. 1 is disassembled and a pusher is pushed by a luer cap. In the indwelling needle of FIG. 1, it is a figure which shows the process in which the inside of a pusher is filled with the blood, (a) shows the state by which half of the inner space of a pusher is filled with the blood, (b) It is a figure which shows the state by which the whole inner space of the pusher was filled with the blood, and (c) shows the state which the blood flowed out into the lure cap. It is an enlarged side view which expands and shows the pusher and luer cap vicinity of the indwelling needle assembly of other embodiment. It is an enlarged side view which expands and shows the outer needle cap of the indwelling needle assembly of further another embodiment.

  Hereinafter, an indwelling needle assembly 1 according to an embodiment of the present invention will be described with reference to the drawings described above. In the following description, the distal end side of the indwelling needle assembly 1 is defined as a distal side and the proximal end side of the indwelling needle assembly 1 is defined as a distal side with respect to a user (that is, an operator) who uses the indwelling needle assembly 1. It is called the proximal side. In addition, the concept of the direction used in the following description is used for convenience in description, and does not limit the direction of the configuration of the invention in that direction. Furthermore, the indwelling needle assembly 1 described below is only 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.

[Indwelling needle assembly]
The indwelling needle assembly 1 of the first embodiment shown in FIG. 1 is mainly used in blood purification therapy such as artificial dialysis. The indwelling needle assembly 1 is configured to extend along a predetermined axis L1 and includes an inner needle unit 2, an outer needle unit 3, a luer cap 4, and a protector 5.

<Inner needle unit>
The inner needle unit 2 includes an inner needle 11, an inner needle hub 12, and an inner needle cap 13. The inner needle 11 is a generally 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 11 has a sharp needle tip 11a at its distal end, and the needle tip 11a is sharply formed so that a blood vessel can be punctured. An inner needle hub 12 is provided at the proximal end of the inner needle 11.

  The inner needle hub 12 is formed in a substantially cylindrical shape, and an intermediate portion thereof is narrowed compared to the proximal portion and the distal portion. Further, a distal end side portion of the inner needle 11 is fitted into the inner hole of the intermediate portion and fixed by an adhesive or the like, and a proximal side opening is formed at the proximal end of the inner needle hub 12. Yes. An inner needle cap 13 is fitted into the proximal opening of the inner needle hub 12. The distal portion of the inner needle hub 12 is formed with a larger diameter than the remaining portions (ie, the intermediate portion and the proximal portion). The proximal portion of each of the luer cap 4 and the protector 5, which will be described in detail later, is accommodated. The inner needle 11 of the inner needle unit 2 configured in this way is inserted through the outer needle unit 3.

<Outer needle unit>
The outer needle unit 3 includes an outer needle 15, an outer needle hub 16, a sealing member 17, a pusher 18, and an outer needle cap 19. The outer needle 15 is a generally cylindrical thin tube made of a soft synthetic resin having flexibility, such as ethylene-tetrafluoroethylene copolymer, polyurethane, polyether nylon, or polypropylene. It is arranged on the position side. More specifically, the outer needle 15 is formed in a tapered shape and is reduced in diameter toward the distal end. In addition, a plurality of holes (not shown) are formed in the outer peripheral surface near the distal end of the outer needle 15 so that infusion such as blood and dialysate can be efficiently flowed. . The proximal end portion of the outer needle 15 having such a shape is inserted into and fixed to the distal opening of the outer needle hub 16.

  The outer needle hub 16 is a substantially cylindrical member made of a synthetic resin, and is colorless and transparent. That is, the outer needle hub 16 is configured so that a practitioner or the like can visually recognize blood flowing therein. The inner hole of the outer needle hub 16 configured as described above is connected to the inner hole of the outer needle 15, and the inner needle 11 is inserted into the outer needle hub 16. More specifically, the outer needle hub 16 includes a cylindrical body 21, an outer needle tube 22, and an outer needle connector 23. The cylindrical body 21 is formed in a substantially cylindrical shape, the outer peripheral surface of the distal side portion thereof is formed in a truncated cone shape, and the outer peripheral surface of the proximal side portion is formed in a substantially cylindrical shape. In the cylindrical body 21 having such a shape, a proximal end portion of the outer needle 15 is fixed to a distal opening thereof, and an outer needle tube 22 is inserted into a proximal side portion of the cylindrical body 21. It is fixed to the inner peripheral surface of the cylindrical body 21.

  The outer needle tube 22 is a tube-shaped member made of synthetic resin and has flexibility. The outer needle tube 22 is fixed with its distal end inserted through the cylindrical body 21. On the other hand, the proximal end portion of the outer needle tube 22 is inserted into and fixed to the outer needle connector 23. The outer needle connector 23 is a substantially cylindrical member made of synthetic resin, and is configured by fitting two members 24 and 25 together. That is, the outer needle connector 23 has a cylindrical member 24 and a connector member 25 as shown in FIG.

  The cylindrical member 24 is a substantially cylindrical member made of synthetic resin, and the outer peripheral surface of the distal end portion thereof is formed in a tapered shape that tapers toward the distal side. An inward flange 24 a is formed on the inner peripheral surface of the cylindrical member 24. The inward flange 24 a is formed over the entire circumference in the intermediate portion of the cylindrical member 24, and protrudes radially inward from the inner circumferential surface of the cylindrical member 24. The outer needle tube 22 is inserted into the cylindrical member 24 from the distal side, and is fixed to the cylindrical member 24 with its proximal end abutted against the inward flange 24a. A sealing member 17 is disposed in the cylindrical member 24.

  The sealing member 17 is made of a material that can be elastically deformed and through which the inner needle 11 can penetrate, for example, synthetic rubber such as polyisoprene or a thermoplastic elastomer, and has a substantially disk shape. Further, the outer diameter of the sealing member 17 substantially matches the inner diameter of the cylindrical member 24. The sealing member 17 having such a shape is fitted into the cylindrical member 24, and is pushed to a position where the outer peripheral edge portion of the main surface (that is, the distal end surface) hits the inward flange 24a. The inner needle 11 is inserted into the inner hole of the cylindrical member 24, and the inner needle 11 passes through the sealing member 17. The sealing member 17 arranged in this manner has a region 16a distal to the sealing member 17 in the outer needle hub 16 (ie, a distal region) 16a and a proximal region (ie, the proximal side). A region) 16b is separated and sealed between them. A connector member 25 is inserted into the inner hole of the cylindrical member 24 so as to press the sealing member 17 against the inward flange 24a.

  The connector member 25 is a substantially cylindrical member made of synthetic resin, and the outer diameter thereof is substantially the same as the inner diameter of the cylindrical member 24. Further, the connector member 25 is inserted into the cylindrical member 24 from the proximal side, and the inner needle 11 is inserted therethrough. Further, the connector member 25 is pushed in until the distal end of the connector member 25 comes into contact with the sealing member 17, and the sealing member 17 is held between the tip of the connector member 25 and the inward flange 24a. In addition, a plurality of locking portions 25a are formed at an intermediate portion of the outer peripheral surface of the connector member 25 at intervals in the circumferential direction, and the cylindrical member 24 is positioned at a position corresponding to each locking portion 25a. A window portion 24b is formed. The locking portion 25 a enters the window portion 24 b when the connector member 25 is inserted into the cylindrical member 24 until the proximal end contacts the sealing member 17. Thereby, the connector member 25 is locked to the cylindrical member 24, and the sealing member 17 is held in the cylindrical member 24. A pusher 18 is housed in the connector member 25.

  The pusher 18 is a substantially cylindrical member made of a synthetic resin, and is colorless and transparent. That is, the pusher 18 can be visually recognized by a practitioner or the like through the blood flowing therein. Further, the outer peripheral surface of the pusher 18 is formed such that a distal portion (that is, a portion on the sealing member 17 side) is tapered toward the distal side, and an intermediate portion and a proximal portion are cylindrical. Is formed. Further, a step 18a is formed on the outer peripheral surface of the pusher 18 at a portion where the distal portion and the intermediate portion are connected, and the pusher 18 has an intermediate portion and a distal portion near the step 18a. The proximal portion has a small diameter. Further, the connector member 25 is formed with an inward flange 25b so as to correspond to the step 18a, and the distal portion of the pusher 18 is fitted between the inward flange 25b and the sealing member 17. It is crowded. Thereby, the level | step difference 18a contact | abuts to the inward flange 25b, and the movement to the proximal side of the pusher 18 is controlled.

  The pusher 18 configured in this manner is accommodated in the connector member 25 in a state where the inner needle 11 is inserted, and is disposed on the same axis as the inner needle 11. The distal end of the pusher 18 is in contact with the sealing member 17 so as to surround the through hole 17a of the sealing member 17 through which the inner needle 11 passes. In this way, the pusher 18 is disposed in the connector member 25 on the proximal side of the sealing member 17 and at the closed position where it comes into contact with the sealing member 17. The sealing member 17 is elastically restored when the inner needle 11 is pulled out to close the through hole 17a. The pusher 18 is configured as follows to communicate the two regions 16a and 16b. Yes. That is, the pusher 18 can move from the closed position to the distal side, and pushing the pusher 18 moves the pusher 18 from the closed position to the distal side. Further, the pusher 18 is moved to the distal side (that is, moved to the open position) to push open the through-hole 17a of the sealing member 17 so that the distal region 16a and the proximal region 16b communicate with each other. It is like that.

  The pusher 18 having such a function is accommodated in a distal portion and an intermediate portion of the connector member 25, and a male connector provided in a syringe, an adapter of a dialysis device, or the like is provided at the proximal end portion of the connector member 25. (Not shown) can be attached. More specifically, a pair of convex portions 25 c (only one convex portion 25 c is shown in FIGS. 1 and 2) is formed at the distal end portion of the connector member 25. The pair of convex portions 25 c protrude outward in the radial direction on the outer peripheral surface of the connector member 25 and in directions opposite to each other. The pair of convex portions 25c is configured to be able to be screwed into a female screw portion (not shown) formed in the male connector when performing dialysis treatment or the like, and the pair of convex portions 25c are screwed into the female screw portion. Thus, the male connector can be detachably attached to the connector member 25. On the other hand, when the blood vessel is punctured, the outer needle cap 19 is screwed into the pair of convex portions 25 c of the connector member 25.

  The outer needle cap 19 is a substantially cylindrical member made of synthetic resin or the like, and is colorless and transparent. That is, the outer needle cap 19 is configured so that a practitioner or the like can visually recognize the inside thereof. The outer needle cap 19 has a step 19a at its intermediate portion, and a distal side portion 19b of the step 19a has a smaller diameter than the proximal portion 19c. The distal portion 19 b is externally screwed onto the proximal end portion of the connector member 25, and the outer needle cap 19 is detachable from the proximal end portion of the connector member 25. Further, the distal portion 19 b of the outer needle cap 19 extends from the proximal end of the pusher 18 in the closed position to the distal side when attached to the connector member 25. A portion of the proximal side of the cover is covered from the radially outer side. On the other hand, the outer needle cap 19 is colorless and transparent as described above, and the distal portion 19b is also colorless and transparent without exception. Further, the distal portion 19b is formed so that there is no unevenness like a knurl on its outer surface. As a result, in the indwelling needle assembly 1, a practitioner or the like can visually recognize blood passing through the pusher 18 even through the distal portion 19 of the outer needle cap 19. The distal portion 19b of the outer needle cap 19 constitutes a double cylinder structure together with an insertion cylindrical portion 19e described later.

  More specifically, on the inner peripheral surface of the outer needle cap 19, an inward flange 19d is formed at an intermediate portion (that is, a position corresponding to the step 19a). The inward flange 19d is formed over the entire circumference in the inner circumferential surface of the outer needle cap 19, and protrudes radially inward from the inner circumferential surface. An insertion cylindrical portion 19e is formed on the inner peripheral edge of the inward flange 19d. The insertion cylindrical portion 19e is formed in a substantially cylindrical shape and protrudes distally from the inner peripheral edge portion of the inward flange 19d. The insertion cylindrical portion 19e thus formed is formed inside the distal side portion 19b and constitutes a double cylinder structure together with the distal side portion 19b as described above. The outer diameter of the insertion cylindrical portion 19e is substantially the same as the inner diameter of the connector member 25, and the insertion cylindrical portion 19e is proximal to the connector member 25 with the outer needle cap 19 screwed into the connector member 25. It is designed to be inserted into the side part. Further, the inner hole of the outer needle cap 19 is divided into a distal region 19f and a proximal region 19g by an inward flange 19d, and the distal region 19f has a proximal portion of the connector member 25 as described above. The end is inserted. On the other hand, a part of the luer cap 4 is accommodated in the proximal region 19g.

<Lure cap>
The luer cap 4 which is an example of an operation member is a substantially cylindrical member made of a synthetic resin, and is colored (that is, a color different from colorless) and has transparency. That is, the luer cap 4 makes it possible for a practitioner or the like to visually recognize blood flowing through the luer cap 4 while clarifying the difference from the pusher 18 by color. The color of the luer cap 4 is not limited to a specific color, but is preferably yellow, green, purple, or the like, for example, yellow in this embodiment. The luer cap 4 configured in this manner has a pushing portion 27 and a housing portion 28 as shown in FIG. The pushing portion 27 has a smaller diameter than the housing portion 28, and the outer diameter of the pushing portion 27 is substantially the same as the inner diameter of the insertion cylindrical portion 19 e of the outer needle cap 19. The pushing portion 27 formed in this way is inserted through the insertion cylindrical portion 19 e, and the distal end of the pushing portion 27 is in contact with the proximal end of the pusher 18. Further, the inner hole of the push-in portion 27 (that is, the inner hole of the luer cap 4) communicates with the inner hole of the pusher 18 in a contact state. The pushing portion 27 arranged in this way is formed to be longer than the insertion cylindrical portion 19e in the needle axis direction (that is, the direction in which the axis L1 extends). The accommodating part 28 is provided integrally.

  The accommodating portion 28, which is an example of the operation portion, is formed in a substantially bottomed cylindrical shape, and the outer diameter thereof is substantially the same as the hole diameter of the proximal region 19 g of the outer needle cap 19. The accommodating portion 28 having such a shape is accommodated in the proximal region 19g and partially protrudes from the outer needle unit 3 to the proximal side. More specifically, since the pushing portion 27 is formed longer than the insertion cylindrical portion 19e, the accommodating portion 28 is outside at a position away from the inward flange 19d proximally (that is, a reference position). The needle cap 19 is accommodated. By accommodating in this way, the luer cap 4 can be pushed distally from the reference position, and the pusher 18 can be moved from the closed position to the open position by pushing. Further, the luer cap 4 is guided along the needle axis direction by being accommodated in the outer needle cap 19, and it is possible to prevent the pushing portion 27 of the luer cap 4 from hitting the pusher 18. .

  As described above, the proximal end portion of the accommodating portion 28 having such a function projects from the outer needle cap 19 to the proximal side, and pushing the proximal end portion causes the luer cap 4 to move distally. I can push it in. Further, by pushing the proximal end of the luer cap 4 distally, the pusher 18 can be pressed against the sealing member 17 via the luer cap 4 and the sealing member 17 can be pushed open. By being pushed open, the inside of the luer cap 4 communicates with the distal region 16 a of the outer needle hub 16 through the inner hole of the pusher 18. The proximal end portion of the luer cap 4 thus configured is covered with the distal portion of the inner needle hub 12, and the proximal end portion of the luer cap 4 is accommodated in the inner needle hub 12. ing. Further, the protector 5 is accommodated in the accommodating portion 28 of the luer cap 4.

<Protector>
The protector 5 is for storing and protecting the needle tip 11a when the inner needle 11 is removed from the outer needle hub, and has a taper portion 5a (see also FIG. 3) at an intermediate portion thereof. The tapered portion 5a is formed in a tapered shape so as to increase in diameter as it advances toward the distal side. Thereby, in the protector 5, the large diameter part 5b containing the said taper part 5a is formed in the distal side, and the small diameter part 5c is formed in the proximal side. An inner needle 11 is penetrated through the protector 5 so as to be relatively movable in the needle axis direction. Further, when the protector 5 is relatively moved in the direction in which the inner needle 11 is pulled out, when the needle tip 11a is accommodated in the protector 5, the inner needle 11 moves in one or the other direction (that is, the proximal side or the far side). Movement to the top side). That is, the protector 5 accommodates the needle tip 11a so as to prevent the needle tip 11a from coming out of the protector 5 and protects the needle tip 11a.

  The protector 5 configured as described above has the large-diameter portion 5 b housed in the housing portion 28 of the luer cap 4. On the other hand, the small diameter portion 5 c protrudes proximally from the luer cap 4 and is housed in the distal portion of the inner needle hub 12. A plurality of engaging portions 32 are formed on the inner peripheral surface of the accommodating portion 28. The large diameter portion 5 b is housed in the luer cap 4 in a state of being engaged with the plurality of engaging portions 32, and the protector 5 is held in the luer cap 4. As a result, the inner needle 11 can be pulled out of the outer needle unit 3 while the protector 5 is housed in the luer cap 4, and the needle tip 11 a of the inner needle 11 can be pulled out. Can be moved into the protector 5 without being exposed from the outer needle hub 16. Further, the engagement portion 32 is configured to release the engagement with the protector 5 by strongly pulling out, and further pulling out the inner needle 11 in a state where the needle tip 11 a is accommodated in the protector 5, the protector 5. Can be removed from the accommodating portion 28.

<Usage form of indwelling needle assembly>
The indwelling needle assembly 1 configured as described above is used in blood purification therapy such as artificial dialysis with the needle tip 11a protruding from the outer needle 15 as shown in FIG. More specifically, the indwelling needle assembly 1 is punctured into the patient's blood vessel with the blade surface of the needle tip 11a facing upward, and is pushed in until the distal portion of the outer needle 15 enters the patient's blood vessel. Thereafter, the inner needle unit 2 is pulled out from the outer needle unit 3 as shown in FIG. 3 in order to collect blood from the blood vessel and to flow an infusion such as dialysate into the blood vessel. That is, the user grasps the inner needle hub 12 and moves it relative to the outer needle unit 3 in the proximal direction. Then, the needle tip 11 a eventually fits in the outer needle 15, and further reaches the protector 5 through the outer needle 15, the outer needle hub 16, the sealing member 17, the pusher 18, and the luer cap 4. By doing so, the needle tip 11 a is protected by the protector 5, and further, the protector 5 is detached from the luer cap 4 by moving the inner needle hub 12 to the proximal side, and the outer needle unit 3 and the inner needle unit 2 are separated. Can be separated. By removing the inner needle unit 2 from the outer needle unit 3 in this manner, blood flows into the outer needle 15 from a plurality of holes near the distal end of the outer needle 15, and the distal region of the outer needle hub 16. 16a is filled with blood.

  Next, the outer needle cap 19 is removed from the connector member 25 and the male connector is screwed into the connector member 25. However, before the outer needle cap 19 is attached, the air venting operation is performed. This is because the proximal region 16b is isolated from the distal region 16a because the sealing member 17 is elastically restored to close the through-hole 17a when the inner needle 11 is pulled out. Therefore, when air is contained in the pusher 18 and the male connector is attached to the connector member 25 in this state, a large amount of air is present in the blood flowing from the distal region 16a through the pusher 18 to the male connector. Will be included. In the indwelling needle assembly 1, before the outer needle cap 19 is removed from the connector member 25, it is not preferable that the blood contains too much blood (especially when returning blood to the artery in dialysis or the like). The air is vented by the following method.

  That is, the proximal end of the luer cap 4 provided in the outer needle cap 19 is pushed distally. Thereby, the pusher 18 is pressed against the sealing member 17 by the pushing portion 27 of the luer cap 4, and the sealing member 17 is pushed open by moving the pusher 18 from the closed position to the open position. As a result, as shown in FIG. 4A, blood 30 (dotted portions in FIGS. 4A and 4B) flows from the distal region 16 a into the pusher 18, and blood in the pusher 18. The liquid level 30a moves toward the proximal side. Further, the sealing member 17 urges the pusher 18 toward the closed position against the pushing force of the pusher 18 to return to elasticity, and the practitioner reduces the pushing force of the luer cap 4. The sealing member 17 that has been pushed open is closed by being separated or released. Therefore, the practitioner can adjust the position of the liquid surface 30 a by adjusting the pressing force of the pusher 18 by the luer cap 4. In the indwelling needle assembly 1, the pusher 18, the connector member 25 that covers the pusher 18, and the distal portion 19 b of the outer needle cap 19 are colorless and transparent. You can see the blood flowing inside. Therefore, the practitioner can adjust the pressing force of the pusher 18 by the luer cap 4 while confirming the position of the liquid level 30a, and the position of the liquid level 30a can be easily adjusted.

  In the indwelling needle assembly 1 configured as described above, the male connector is attached by guiding the blood to the proximal end of the pusher 18 and filling the entire pusher 18 with the blood 30 as shown in FIG. It is possible to prevent air from remaining in the blood after a long time. On the other hand, when the sealing member 17 is continuously pushed open, the blood 30 flows from the pusher 18 to the luer cap 4 by the blood pressure of the patient as shown in FIG. Therefore, it is preferable to stop the liquid level 30 a at the proximal end of the pusher 18 (that is, the boundary between the pusher 18 and the luer cap 4) without expecting the timing of releasing the luer cap 4. In this regard, in the indwelling needle assembly 1, the pushing portion 27 of the luer cap 4 is colored with respect to the pusher 18 that is colorless (see the gray portions in FIGS. 4A to 4C). Therefore, the operator can easily identify the boundary 31 between the pusher 18 and the luer cap 4 (ie, the proximal end surface of the pusher 18), and the timing at which the luer cap 4 is released (ie, the pusher 18 is in the closed position). It is possible to make it easier to understand the timing of returning to (). Thereby, when the inside of the pusher 18 is filled with blood in order to remove the air in the pusher 18, it can flow out to the luer cap 4 side and the amount of the blood can be suppressed.

  After filling the entire pusher 18 with blood in this way, in the indwelling needle assembly 1, the outer needle cap 19 is removed together with the luer cap 4 from the connector member 25. Thereafter, in order to attach the male connector to the connector member 25, the distal end portion of the male connector is inserted into the connector member 25, and the female screw portion of the male connector is screwed into the pair of convex portions 25c of the connector member 25. Then, the pusher 18 is pushed by the tip of the male connector and moves toward the open position, and the sealing member 17 is pushed open. As a result, the male connector and the distal region 16a communicate with each other via the pusher 18, and blood 30 in the blood vessel is guided into the male connector. Thus, in the indwelling needle assembly 1, the air venting operation is performed before the puncturing operation and the connector replacement operation are performed.

<Other embodiments>
In the indwelling needle assembly 1 of the present embodiment, the outer needle hub 16, the pusher 18, and the outer needle cap 19 are colorless and transparent, but the liquid level of the blood 30 that flows through the pusher 18. It is not necessary to be colorless as long as the position of 30a is transparent enough for the practitioner to visually recognize the position 30a through the pusher 18. For example, the pusher 18 only needs to have a color different from the color (green, yellow, purple, etc.) of at least the pushing portion 27 of the luer cap 4, more specifically, the outer peripheral surface near the tip of the pushing portion 27. Further, the outer needle hub 16 and the outer needle cap 19 may be similar in color to the luer cap 4. Moreover, the outer needle hub 16 does not need to be transparent as a whole, and at least the connector member 25 may be transparent. In addition, the transparency in this embodiment is not necessarily limited to the one that completely transmits light, and as described above, shows the performance that allows the practitioner to visually recognize the blood flowing therein. That is, the transparent material includes a transparent material and a translucent material, and more specifically includes a material having a haze of 1.0% or more.

  Further, the luer cap 4 is not limited to a colored and transparent material, and may be a colorless and transparent material. In this case, the pusher 18 is preferably colored and transparent. In addition, when the indwelling needle assembly 1 is used for dialysis treatment, red, blue, etc. are arranged on each member so that the members connected to the vein and the artery can be easily distinguished. The needle hub 16, the pusher 18, and the outer needle cap 19 are preferably colors other than red and blue.

  Moreover, neither the luer cap 4 nor the pusher 18 needs to have transparency, and only one of them needs to have transparency. When the pusher 18 is more transparent, the process of the liquid level 30a reaching the proximal end (ie, the boundary) of the pusher 18 can be visually recognized, and the luer cap 4 is more transparent. In this case, the process of the liquid level 30a moving from the pusher 18 into the luer cap 4 can be visually confirmed. In any case, it is possible to recognize that the liquid level 30a has reached the boundary 31.

  Further, in the indwelling needle assembly 1, the color of the pusher 18 and the luer cap 4 is made different so that the boundary 31 between the pusher 18 and the luer cap 4 can be easily recognized, but the boundary 31 is recognized. The method is not necessarily limited to coloring. For example, as shown in FIG. 5, surface treatment processing (for example, rib processing and grain processing) is performed on the outer peripheral surface of the tip portion of the luer cap 4 of the indwelling needle assembly 1A (ie, the distal end portion of the pushing portion 27). In this embodiment, the knurling process 33) may be performed to easily identify the boundary 31 between the pusher 18 and the luer cap 4 (that is, the proximal end face of the pusher 18). In this case, the pusher 18 and the luer cap 4 may be similar in color. In addition, the boundary 31 may be identified by performing partial printing or applying a seal or the like instead of subjecting the outer surface of the tip portion of the luer cap 4 to surface treatment. Further, the boundary 31 may be identified by the shape of the pushing portion 27 of the luer cap 4.

  Furthermore, in the indwelling needle assembly 1, the outer peripheral surface of the distal side portion 19 b of the outer needle cap 19 is formed so as not to have irregularities, but such a shape is not necessarily required. For example, like the indwelling needle assembly 1B shown in FIG. 6, a plurality of ridges 34 extending in the needle axis direction may be formed on the outer peripheral surface of the distal side portion 19b of the outer needle cap 19. In addition, when forming the some protruding item | line part 34, you may form without a clearance gap in an outer peripheral surface, but arrange | positions at intervals between adjacent protruding item | line parts 34 (for example, angle 45 degrees-75 in the circumferential direction). It is preferable to arrange them every time. In this case, it is easy to visually recognize the movement of the liquid level from between the adjacent ridges 34, and when removing the outer needle cap 19, the plurality of ridges 34 play a role of preventing slippage.

1,1A Indwelling needle assembly 4 Luer cap (actuating member)
DESCRIPTION OF SYMBOLS 11 Inner needle 11a Needle tip 12 Inner needle hub 15 Outer needle 16 Outer needle hub 16a Distal region 16b Proximal region 17 Sealing member 18 Pusher 19 Outer needle cap 19b Distal portion 19c Proximal portion 27 Push Part 28 Housing part (operation part)

Claims (7)

An inner needle having a sharp needle tip on the distal side;
An inner needle hub provided on the proximal side of the inner needle;
An outer needle through which the inner needle is inserted;
A cylindrical outer needle hub in which the outer needle is attached to the distal opening and the inner needle is inserted;
A sealing member that is disposed in the outer needle hub in a state in which the inner needle is penetrated, and divides the inside of the outer needle hub into a distal region and a proximal region, and seals between them.
A closed position disposed within the outer needle hub and located proximal to the sealing member; and distal to the closed position to push open the sealing member and the distal region and the A cylindrical pusher movable between an open position communicating with the proximal region;
A cylindrical actuating member that contacts the proximal end surface of the pusher and is operated to push the pusher and move it to the open position;
In the outer needle hub, at least a portion covering the proximal end surface of the pusher has transparency,
At least one of the pusher and the actuating member has transparency so that the inside can be visually recognized,
The pusher and the actuating member are configured such that their inner holes communicate with each other at the proximal end face of the pusher and the proximal end face of the pusher can be identified with respect to the actuating member. Indwelling needle assembly.   The indwelling needle set according to claim 1, wherein each portion of the pusher and the actuating member that are in contact with each other has a different color so that a proximal end surface of the pusher can be identified. Solid. The pusher is colorless and transparent,
The indwelling needle assembly according to claim 2, wherein the operating member is colored.   The surface of the outer surface of the actuating member is subjected to a surface treatment at a portion in contact with the pusher so that the proximal end surface of the pusher can be identified. The indwelling needle assembly according to 1. An outer needle cap that is screwed onto the proximal end of the outer needle hub.
The actuating member is disposed within the outer needle hub and is operated to push the pusher toward the open position via the pusher, and a pusher that contacts the proximal end surface of the pusher. An operation unit,
The outer needle cap has a proximal portion that houses the actuating member therein, and a distal portion that is threadably engaged with the proximal end of the outer needle hub,
The indwelling needle assembly according to any one of claims 1 to 4, wherein a distal side portion of the outer needle cap has transparency so that an inside thereof can be visually recognized.   The indwelling needle assembly according to claim 5, wherein an outer peripheral surface of a distal side portion of the outer needle cap is formed without unevenness so that an inner side of the outer needle cap can be visually recognized. On the outer peripheral surface of the distal end portion of the outer needle cap, a plurality of ridges are formed,
6. The indwelling needle assembly according to claim 5, wherein each of the plurality of projecting ridges is arranged at an interval so that the inside of the outer needle cap can be visually recognized from between adjacent ridges.