JP6347912B2 - Indwelling needle assembly - Google Patents

Description

  The present invention relates to an indwelling needle assembly that is punctured and placed in a blood vessel during artificial dialysis, infusion or blood collection.

  When a practitioner performs artificial dialysis, infusion, blood collection, or the like on a patient, an indwelling needle assembly is used. As the indwelling needle assembly, for example, a catheter and an introduction needle as disclosed in Patent Document 1 are used. There is an assembly.

  The assembly of Patent Document 1 includes a cylindrical catheter hub (outer needle hub), a catheter (outer needle) fixed to the distal end of the catheter hub, a needle (inner needle) having a sharp needle tip at the distal end, And a needle hub fixed to the proximal end of the needle. The catheter hub has a side hole, which is connected to the adapter via a tubular portion and an extension tube. Further, a plug (sealing member) is provided in the catheter hub on the proximal side from the side hole, and the proximal end of the catheter hub is sealed by the plug. The needle is inserted through the catheter hub and the catheter so as to penetrate the plug, and the needle tip of the needle protrudes from the distal end of the catheter with the needle hub engaged with the catheter hub.

  In the assembly of Patent Document 1 configured as described above, the plug is formed of an elastic member such as silicone rubber, and the through hole remaining in the plug is closed when the needle is removed from the catheter hub. . Thereby, even after the needle is removed from the catheter hub, the liquid in the catheter hub can be prevented from leaking out through the through hole.

JP-A-8-257129

  In the indwelling needle assembly, blood enters the needle during puncture because the needle is formed in a hollow cylindrical shape. Therefore, when the needle is removed from the plug, blood in the needle may flow out and fall to the end face of the plug, and may remain as a blood pool there. In the indwelling needle assembly, since the catheter hub is made of a transparent material to facilitate confirmation of flashback, the blood pool on the plug end face is clearly visible to the operator. Unlike a leak from the through-hole, the blood pool is formed with a very small amount of blood and there is no risk of spilling from the indwelling needle assembly. There is a risk of misrecognizing that blood is leaking.

  Accordingly, an object of the present invention is to provide an indwelling needle assembly that allows the practitioner to remove the inner needle from the outer needle hub without giving the practitioner the erroneous recognition that blood is leaking. Yes.

  In the above invention, an inner needle having a sharp needle tip at a distal end portion, an inner needle hub provided on the proximal end side of the inner needle, a hollow outer needle through which the inner needle is inserted, An outer needle hub in which an inner needle is inserted and an inner space having an outer needle insertion port and a hub insertion port is formed, and the inner needle is provided between the outer needle insertion port and the hub insertion port. A sealing member for sealing the outer needle, the outer needle insertion port is provided with a base end portion of the outer needle, and the hub insertion port is detachably attached with the inner needle hub, The needle hub has a transport port formed at a position different from the outer needle insertion port and the hub insertion port, and connected to a region closer to the outer needle insertion port than the sealing member of the internal space, The inner needle penetrates the sealing member, and the sealing member moves the inner needle when the inner needle is withdrawn therefrom. The outer needle hub includes an outer needle hub main body having the inner space and the transport port, and the sealing member of the inner space. A tubular covering member disposed in a region on the hub insertion port side, the outer needle hub body is made of a transparent material, and the inner needle is inserted through the covering member, The covering member is made of an opaque material compared to the outer needle hub body.

  If the said structure is followed, the coating | coated member which has transparency will be covered in the internal space, and the opening by the side of the hub insertion port of a through-hole can be covered, and it cannot be visually recognized from the outside. Therefore, even when the inner needle is removed from the sealing member, blood adhering to the needle tip of the inner needle falls and a blood pool is formed mainly at the position where the opening of the through hole on the hub insertion side is present. It is possible to reduce the situation where the practitioner clearly recognizes the blood pool as blood. Thereby, the situation which gives the practitioner the misrecognition that the blood has leaked can be reduced. On the other hand, the portion closer to the outer needle insertion port than the sealing member of the outer needle hub can clearly see the internal space from the outside. Therefore, by visually recognizing the portion from the outside, the practitioner can confirm flashback after puncturing the tip of the inner needle.

  ADVANTAGE OF THE INVENTION According to this invention, the situation which gives the practitioner the misrecognition that the blood has leaked can be reduced.

It is a top view which shows the indwelling needle assembly which is 1st Embodiment of this invention. It is sectional drawing which cut | disconnected the indwelling needle assembly of FIG. 1 by the cutting line II-II. FIG. 3 is an exploded view showing the indwelling needle assembly of FIG. 2 in an exploded manner. It is a perspective view which shows the coating | coated member with which the indwelling needle assembly of FIG. 1 is equipped. It is the cross-sectional perspective view which cut | disconnected the covering member of FIG. 4 by the cutting line VV. It is sectional drawing which shows the indwelling needle assembly which is 2nd Embodiment of this invention.

  Hereinafter, indwelling needle assemblies 1 and 1A according to 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 in description, and does not limit the direction of the configuration of the invention in that direction. Indwelling needle assemblies 1 and 1A described below are 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 is used when a needle is punctured and placed in a blood vessel or the like, and a drug solution is administered into the blood vessel by the needle or blood is collected from the blood vessel. As shown in FIGS. 1 to 3, the indwelling needle assembly 1 includes an indwelling needle body 2 and a hemostatic rubber 3. The indwelling needle body 2 is formed along the axis L1 and includes an inner needle 11, an inner needle hub 12, an outer needle 13, and an outer needle hub 14. In the following description, a distal portion is referred to as a distal end portion with respect to a practitioner who punctures a patient with the indwelling needle assembly 1, and a proximal portion of the practitioner is referred to as a proximal end portion. ing. The axial direction means a direction along the axis L1 of the indwelling needle body 2.

<Indwelling needle body>
The inner needle 11 is a generally cylindrical hollow needle made of a metal material such as stainless steel, aluminum, aluminum alloy, titanium, titanium alloy, or a hard synthetic resin, and has an axis L2 (substantially coincident with the axis L1). It extends straight along. The inner needle 11 has a sharp needle tip 11a formed so as to be able to puncture a blood vessel at a distal end portion, and an inner needle hub 12 is provided at a proximal end portion.

  The inner needle hub 12 has a cap portion 21 and a grip portion 22, and the cap portion 21 is a substantially bottomed cylindrical portion made of, for example, a synthetic resin. The distal end side of the cap portion 21 is formed to have a larger diameter than the proximal end portion side, and the inner needle 11 is disposed at the distal end of the small diameter portion 21a on the distal end portion side of the cap portion 21 so that the respective axes coincide. It is inserted and fixed. Further, a substantially plate-shaped gripping portion 22 is integrally provided on the large-diameter portion 21 b on the base end side of the cap portion 21. The grip portion 22 protrudes radially outward from the outer peripheral surface portion of the cap portion 21, and is configured so that a practitioner such as a doctor or a nurse can grip it by hand. The inner needle 11 and the inner needle hub 12 configured as described above are inserted through the outer needle 13 and the outer needle hub 14, respectively.

  The outer needle 13 is a generally cylindrical thin tube made of a soft synthetic resin having flexibility, such as ethylene-tetrafluoroethylene copolymer, polyurethane, polyether nylon, or polypropylene. The outer needle 13 is formed shorter than the inner needle 11, and the needle tip 11 a of the inner needle 11 inserted through the outer needle 13 protrudes from the tip of the outer needle 13. Further, the distal end portion of the outer needle 13 is formed in a tapered shape that increases in diameter toward the proximal end side, and similarly to the needle tip 11a of the inner needle 11, resistance when puncturing the patient's blood vessel is reduced. I am letting. An outer needle hub 14 is provided at the proximal end portion of the outer needle 13.

  The outer needle hub 14 has a hub body 24 and a locking fixture 25. The hub main body 24 is a Y-shaped member made of a transparent synthetic resin, and has a main body portion 26 and a tube coupling portion 27. The hub body 24 can clearly see the internal space, and has a transparency with a haze lower than 30% (sample thickness = 2 mm) in the haze defined by ISO14782. The main body portion 26 is formed in a substantially cylindrical shape, and is formed in a taper shape that tapers as the outer peripheral surface of the distal end portion moves toward the distal end. An inner hole 26 a extends along the axis of the body portion 26, and the inner hole 26 a has an outer needle insertion port 26 b on the distal end side of the body portion 26, and is located on the proximal end side of the body portion 26. A hub insertion port 26c is provided.

  The proximal end portion of the outer needle 13 is inserted into and fixed to the distal end portion of the main body portion 26 through the outer needle insertion port 26b. The inner diameter of the hub insertion port 26c substantially matches the outer diameter of the small diameter portion 21a of the cap portion 21 of the inner needle hub 12, and the small diameter portion 21a is fitted into the hub insertion port 26c. The inner diameter of the hub insertion port 26c is smaller than the outer diameter of the large-diameter portion 21b of the cap portion 21, and the large-diameter portion 21b abuts on the proximal end of the outer needle hub 14 to thereby connect the hub insertion port 26c. Closed from the outside.

  Further, a seat 26e is formed on the inner peripheral surface of the main body portion 26, and the seat 26e is formed in a taper shape that tapers toward the tip in order to lock the hemostatic rubber 3 described later. On the other hand, a tube coupling portion 27 is integrally provided on the outer peripheral surface of the main body portion 26 so as to branch from the main body portion 26.

  The tube coupling portion 27 extends obliquely toward the base end side of the main body portion 26 so as to be separated from the outer peripheral surface of the main body portion 26 radially outward. The tube coupling portion 27 arranged in this way is formed in a substantially cylindrical shape, a communication port 27a is formed at one end, and a transport port 27b is formed at the other end. The communication port 27a is connected to the inner hole 26a of the main body portion 26 on the distal end side from the seat 26e. Further, one end of a flexible tube 28 is inserted into and fixed to the transport port 27b. The other end of the tube 28 is provided with a connector (not shown) for connection to an infusion set and a blood collection set.

  A window portion 26 d is formed on the outer peripheral portion of the main body portion 26 on the proximal end side with respect to the tube coupling portion 27. The window portion 26d is a hole penetrating the outer peripheral portion of the main body portion 26, and is positioned 90 degrees or more and 180 degrees or less in the circumferential direction with respect to the tube coupling portion 27 when viewed from the distal end side, in this embodiment, 90 degrees. It is formed at a shifted position. The window portion 26d is formed in a substantially rectangular shape when viewed from the bottom, and its horizontal width (length in the left-right direction toward FIG. 1) is substantially the same as the diameter of the inner hole 26a. A locking fixture 25 is inserted into the window portion 26d, and the inserted locking fixture 25 is accommodated in the inner hole 26a. Below, the structure of the locking fixture 25 is demonstrated, also referring FIG.4 and FIG.5.

<Locking fixture>
The locking fixture 25 that is a covering member is made of a synthetic resin that is more opaque than the hub body, such as polypropylene, polyethylene, and polyacetal, and has a locking portion 29 and a skin fixing portion 30. The locking portion 29 has a generally bowl-shaped cross section, that is, the upper side is a semi-cylindrical shape and the lower side is a rectangular parallelepiped shape. The semi-cylindrical portion 29 a of the locking portion 29 is configured such that the outer diameter of the outer peripheral surface thereof substantially matches the inner diameter of the inner peripheral surface of the main body portion 26. On the other hand, the rectangular parallelepiped portion 29b of the locking portion 29 is configured such that the outer dimension thereof substantially matches the outer dimension of the window portion 26d when viewed from the bottom.

  The locking portion 29 having such a shape is inserted from the window portion 26 d and is fitted into the main body portion 26 so that the semi-cylindrical portion 29 a comes into contact with the inner peripheral surface of the main body portion 26. An insertion hole 31 extending along the axis L <b> 1 is formed in the locking portion 29, and the inner needle 11 extending from the cap portion 21 to the distal end side is inserted into the insertion hole 31. . The inner diameter of the insertion hole 31 differs between the distal end portion 31a and the proximal end portion 31b, and the proximal end portion 31b is smaller in diameter than the distal end portion 31a. On the other hand, the bottom portion of the rectangular parallelepiped portion 29b of the locking portion 29 protrudes outward from the window portion 26d, and the skin fixing portion 30 is integrally provided on the bottom portion.

  The skin fixing part 30 is a plate-like member that is substantially rectangular in a plan view, and a locking part 29 is integrally provided on the upper surface thereof. The skin fixing part 30 is formed wider than the hub main body 24, and both ends in the width direction (corresponding to the left-right direction in FIG. 1) extend to the laterally outer side of the hub main body 24. In addition, the lower surface of the skin fixing part 30 is flat, and the stability of the skin fixing part 30 on the placement part is improved by increasing the contact area with the placement part (for example, a patient's arm). I am letting.

  The locking fixture 25 configured as described above is locked to the main body portion 26 by fitting the locking portion 29 into the main body portion 26. The proximal end of the locking portion 29 is in contact with the distal end of the cap portion 21 of the inner needle hub 12. On the other hand, the front end of the locking portion 29 is opposed to the seat 26e of the main body portion 26 with an interval A1, and a rubber accommodating space 26f is formed between the locking portion 29 and the seat 26e. And the hemostatic rubber 3 is fitted in this rubber accommodating space 26f as shown in FIGS.

<Hemostatic rubber>
The hemostatic rubber 3 as a sealing member is a solid, generally cylindrical member made of a synthetic rubber such as polyisoprene or a thermoplastic elastomer. The outer diameter of the hemostatic rubber 3 is substantially the same as or slightly larger than the inner diameter of the inner hole 26a of the main body portion 26, and the distal end portion of the hemostatic rubber 3 is seated (or engaged) with the seat 26e. In the state, it is fitted in the rubber accommodating space 26f. The hemostatic rubber 3 divides the inner hole 26a into a liquid space 32 and a storage space 33, and seals between these two spaces 3 2 and 3 3 . Thereby, leakage of the chemical liquid or blood from the liquid space 32 to the storage space 33 can be prevented. Here, the liquid space 32 is a region on the distal end side of the hemostatic rubber 3 in the inner hole 26 a and is a space connected to the inside of the outer needle 13 and the tube 28. The accommodation space 33 is a region on the proximal end side of the hemostatic rubber 3 in the inner hole 26a, and is a space in which the locking portion 29 is accommodated and connected to the hub insertion port 26c.

  The hemostatic rubber 3 is formed such that its axial length is slightly longer than the interval A1. Therefore, the base end portion of the hemostatic rubber 3 slightly protrudes into the accommodation space 33 in a state where the engagement portion 29 is not accommodated in the accommodation space 33, and the hemostatic rubber is accommodated by accommodating the engagement portion 29 in the accommodation space 33. 3 is pressed against the seat 26e by the locking portion 29. Thereby, the hemostatic rubber 3 is clamped by the seat 26e and the engaging portion 29 and fixed in the rubber accommodating space 26f, and the hemostatic rubber 3 can be prevented from moving in the axial direction within the main body portion 26. Therefore, it is possible to prevent the hemostatic rubber 3 from coming off when the inner needle 11 is pulled out, or the chemical liquid or blood from leaking from the liquid space 32 to the accommodating space 33 due to the movement of the hemostatic rubber 3.

  The hemostasis rubber 3 thus configured has an inner needle 11 passing through the axial center or the periphery thereof. The hemostatic rubber 3 is made of synthetic rubber or thermoplastic elastomer as described above, and has elasticity. Therefore, the hemostatic rubber 3 is pressed against the outer peripheral surface of the portion through which the inner needle 11 passes to seal between the inner needle 11 and the hemostatic rubber 3, and is sealed even if the inner needle 11 is moved in the axial direction. It is designed to maintain the state.

  In addition, the hemostatic rubber 3 is elastically restored after the inner needle 11 is removed therefrom, and closes the through hole 34 through which the inner needle 11 passes. That is, the hemostatic rubber 3 seals the space between the liquid space 32 and the storage space 33 even after the inner needle 11 is pulled out therefrom. As described above, the hemostatic rubber 3 can seal the space between the liquid space 32 and the storage space 33 regardless of whether or not the inner needle 11 penetrates, and can prevent the chemical liquid and blood from leaking into the storage space 33.

<How to assemble the indwelling needle assembly>
Below, the assembly method of the indwelling needle assembly 1 comprised in this way is demonstrated. In the indwelling needle assembly 1, first, the locking portion 29 of the locking fixture 25 is inserted into the window portion 26 d of the main body portion 26. Next, the inner needle 11 is inserted from the hub insertion port 26c. At this time, the needle tip 11 a passes through the insertion hole 31 of the locking portion 29, pierces the hemostatic rubber 3, and further passes through the hemostatic rubber 3 and is inserted into the outer needle 13. Then, the needle tip 11a protrudes from the tip of the outer needle 13, and the cap portion 21 is fitted into the hub insertion port 26c of the outer needle hub 14. Thus, the hub insertion hole 26c is closed by the cap portion 21, an inner needle 11 which is fixed to the cap portion 21 penetrates the hemostatic rubber 3 inserted into the through-hole 34.

In the indwelling needle assembly 1 configured as described above, the locking fixture 25 is made of an opaque material. Therefore, when the engaging portion 29 is fitted to the inner peripheral surface of the main body portion 26, the portion closer to the hub insertion port 26 c than the hemostatic rubber 3 of the outer needle hub 14 clearly defines the inner hole 26 a from the outside of the outer needle hub 14. Is not visible. More specifically, in the indwelling needle assembly 1, the locking portion 29 covers the base end face of the hemostatic rubber 3 (particularly, the opening on the base end side of the through hole 34) from the outside.

  In the indwelling needle assembly 1, the locking portion 29 can be disposed in the accommodation space 33 by inserting the locking portion 29 of the locking fixture 25 into the window portion 26 d formed in the main body portion 26. . Therefore, in the indwelling needle assembly 1, the locking portion 29 can be easily assembled, and the locking fixture 25 can be easily locked to the main body portion 26.

<Function of indwelling needle assembly>
In the indwelling needle assembly 1, the needle tip 11 a is punctured into a blood vessel or the like when an infusion or blood is collected, and the outer needle 13 is inserted into the blood vessel or the like. Then, the inside of the blood vessel and the inside of the main body portion 26 are electrically connected via the outer needle 13, and a flashback in which blood in the blood vessel flows into the liquid space 32 of the main body portion 26 occurs. In the indwelling needle assembly 1, since the hub main body 24 is made of a synthetic resin having transparency, this flashback can be confirmed through the hub main body 24. Upon confirmation, the skin fixing part 30 is placed in the vicinity of the patient's puncture site, and the inner needle 11 is removed from the outer needle 13 to start infusion or blood collection. At this time, the outer needle hub 14 can be fixed by pressing both ends of the skin fixing portion 30 in the width direction with fingers or the like, and the outer needle hub 14 is stabilized (that is, the outer needle hub 14 is moved). None) The inner needle 11 can be pulled out. Thereby, the pain at the time of pulling out the inner needle 11 can be reduced.

  When the inner needle 11 is pulled out, the needle tip 11 a of the inner needle 11 is first accommodated in the outer needle 13. The needle tip 11a of the inner needle 11 passes through the outer needle 13 and reaches the hemostatic rubber 3 through the inner hole 26a. When the needle tip 11 a of the inner needle 11 is removed from the hemostatic rubber 3, the portion around the through hole 34 is elastically restored to close the through hole 34. Thereby, it can prevent that a chemical | medical solution or blood leaks. Further, since the hemostatic rubber 3 is pressed against the inner needle 11, the blood adhering to the needle tip 11a of the inner needle 11 at the time of puncture is wiped off when the blood is extracted by the hemostatic rubber 3, and the blood adhering to the needle tip 11a is removed from the practitioner. It can be prevented from adhering to third parties such as.

  On the other hand, blood flows into the inner needle 11 at the time of puncturing. When the needle tip 11a is extracted from the hemostatic rubber 3 and exposed to atmospheric pressure, the blood in the inner needle 11 flows out from the needle tip 11a and is hemostatic rubber. 3, specifically, the position where the opening on the proximal end side of the through hole 34 is located and the vicinity thereof, and a blood pool is formed there. The place where the blood pool is formed (that is, the position where there is an opening on the proximal end side of the through hole 34 and its vicinity) is covered by the locking portion 29 and is inserted into the outer needle from the sealing member of the outer needle hub. Compared to the mouth side, it is opaque. Therefore, the practitioner does not clearly recognize that the blood pool is blood, and erroneously recognizes that the blood pool is formed by blood leaking from the through hole 34 of the hemostatic rubber 3. The operator can remove the inner needle 11 from the outer needle hub 14 without taking it out.

  Further, the inner diameter of the front end side of the locking portion 29 is formed to be large, and the locking portion 29 is pressed against the hemostatic rubber 3 so that the locking portion 29 is in close contact with the hemostatic rubber 3. Therefore, the blood that has flowed out of the needle tip 11a can be retained in the locking portion 29, and the locking portion 29 and the main body portion 26 pass through the gap between the locking portion 29 and the hemostatic rubber 3. It is possible to prevent leakage during the period.

  After extraction, the drug solution is flowed or blood is collected according to the set (infusion set or voting set) connected to the connector. During infusion or blood collection, the indwelling needle assembly 1 is placed in the vicinity of the puncture site with the skin fixing part 30 applied near the puncture site of the patient. The skin fixing part 30 is formed wider than the hub body 24, and its lower surface is flat. Therefore, the placement area of the indwelling needle assembly 1 can be increased, and the stability of the skin fixing part 30 on the placement site is improved. Therefore, it is possible to prevent the indwelling needle assembly 1 from moving and causing pain to the patient during infusion or blood collection, or the indwelling needle assembly 1 from coming off the patient.

Second Embodiment
The indwelling needle assembly 1A of the second embodiment is similar in configuration to the indwelling needle assembly 1 of the first embodiment. Below, about the structure of the indwelling needle assembly 1 of 2nd Embodiment, a different point from the indwelling needle assembly 1 of 1st Embodiment is mainly demonstrated, and the same code | symbol is attached | subjected about the same structure, and the The description may be omitted.

  As shown in FIG. 6, the indwelling needle assembly 1A includes an inner needle 11, an inner needle hub 12, an outer needle 13, and an outer needle hub 14A. The outer needle hub 14A includes a hub body 24A and a locking tool 25A. Have. The configuration of the hub main body 24A has the same configuration as the hub main body 24 of the first embodiment except that the window portion 26d is not formed. The locking member 25A, which is a covering member, is an opaque member formed in a substantially cylindrical shape. The locking tool 25 </ b> A is inserted from the hub insertion port 26 c, is in contact with the proximal end surface of the hemostatic rubber 3, and is accommodated in the accommodating space 33 of the main body portion 26. The locking tool 25A is pressed by the cap portion 21 to press the hemostatic rubber 3 against the seat 26e, and clamps and fixes the hemostatic rubber 3 in cooperation with the main body portion 26. Further, an insertion hole 31 extending along the axis L1 is formed in the locking tool 25A, and the inner needle 11 extending from the cap portion 21 to the distal end side is inserted into the insertion hole 31. ing.

The locking tool 25A configured in this manner is arranged so that the portion of the outer needle hub 14A closer to the outer needle insertion port 26b than the hemostatic rubber 3 cannot clearly see the inner hole 26a from the outer side of the outer needle hub 14A. ing. More specifically, in the indwelling needle assembly 1A , the locking portion 29 covers the base end surface of the hemostatic rubber 3 (particularly, the opening on the base end side of the through hole 34) from the outside. Thereby, the inner needle 11 is pulled out of the outer needle hub 14 and taken out to the practitioner without giving the practitioner the erroneous recognition that this blood pool is formed by blood leaking from the through-hole 34 of the hemostatic rubber 3. Can be made.

  In addition, the indwelling needle assembly 1A of the second embodiment has the same functions and effects as the indwelling needle assembly 1 of the first embodiment except for the functions and effects achieved by the skin fixing portion 30.

<About other embodiments>
In the indwelling needle assemblies 1 and 1A of the first and second embodiments, the outer needle hub 14 is made of a synthetic resin having transparency, but the synthetic resin having transparency and the synthetic resin having opacity are used. The outer needle hub 14 may be configured by two-color molding. Specifically, the distal end side of the outer needle hub 14 is made of a synthetic resin having transparency, and the proximal end side of the hemostatic rubber 3 is made of a synthetic resin having transparency. As a result, flashback in the liquid space 32 can be confirmed, and the blood pool formed at and near the position where the opening on the proximal end side of the through hole 34 is present leaks from the through hole 34 of the hemostatic rubber 3. It is possible to prevent the operator from being erroneously recognized as having been formed by blood.

  In another embodiment, the resin on the hub insertion port side from the sealing member of the outer needle hub is colored resin, so that the inside of the portion on the hub insertion port side can be seen from the sealing member of the outer needle hub. It may be difficult.

  In addition, the said embodiment is only an example and can be changed to such an extent that it does not deviate from the meaning of this invention, and it visually recognizes from an external appearance, compared with the part by the side of the outer needle hub sealing member side. It only needs to be opaque. With such a configuration, the internal space of the portion on the hub insertion port side is relatively difficult to see, and therefore, when the inner needle is removed from the sealing member, blood adhering to the needle tip of the inner needle Even if it falls and forms a blood pool on the hub insertion port side of the sealing member, it is possible to reduce the situation that the practitioner is clearly recognized as blood. The portion closer to the hub insertion port than the sealing member of the outer needle hub is preferably translucent or completely opaque. The translucent transparency is preferably higher than 30% (sample thickness = 2 mm) in the haze specified by ISO14782.

1,1A Indwelling needle assembly 3 Hemostatic rubber 11 Inner needle 11a Needle tip 12 Inner needle hub 13 Outer needle 14, 14A Outer needle hub 24, 24A Hub body 25 Locking fixture 25A Locking tool 26a Inner hole 26b Outer needle insertion 26c Hub insertion port 26d Window part 26e Seat 27b Transport port 30 Skin fixing part

Claims (5)

An inner needle having a sharp needle tip at the tip,
An inner needle hub provided on the proximal end side of the inner needle;
A hollow outer needle through which the inner needle is inserted;
An outer needle hub through which the inner needle is inserted and an internal space having an outer needle insertion port and a hub insertion port is formed;
A sealing member that is provided in the internal space and seals between the outer needle insertion port and the hub insertion port;
The outer needle insertion port is provided with a proximal end portion of the outer needle,
The inner needle hub is detachably attached to the hub insertion port,
The outer needle hub has a transport port that is formed at a position different from the outer needle insertion port and the hub insertion port, and is connected to a region closer to the outer needle insertion port than the sealing member in the inner space. ,
The inner needle penetrates the sealing member;
The sealing member is configured to elastically return and close the through-hole through which the inner needle has passed when the inner needle is withdrawn therefrom,
The outer needle hub includes an outer needle hub body having the inner space and the transport port, and a cylindrical covering member disposed in a region closer to the hub insertion port than the sealing member of the inner space. Have
The outer needle hub body is made of a transparent material,
The inner needle is inserted through the covering member,
The said covering member is an indwelling needle assembly comprised with the material opaque compared with an outer needle hub main body.   The indwelling needle assembly according to claim 1, wherein the covering member clamps the sealing member in cooperation with the outer needle hub body. In the outer needle hub, a window portion penetrating the outer peripheral portion is formed in the outer peripheral portion on the hub insertion port side from the sealing member,
The indwelling needle assembly according to claim 1 or 2, wherein the covering member is inserted into the internal space from the window portion. The covering member is integrally formed with a plate-like skin fixing portion formed wider than the width of the outer needle hub,
The indwelling needle assembly according to any one of claims 1 to 3, wherein the skin fixing portion is disposed outside the outer needle hub. An inner needle having a sharp needle tip at the tip,
An inner needle hub provided on the proximal end side of the inner needle;
A hollow outer needle through which the inner needle is inserted;
An outer needle hub through which the inner needle is inserted and an internal space having an outer needle insertion port and a hub insertion port is formed;
A sealing member that is provided in the internal space and seals between the outer needle insertion port and the hub insertion port;
The outer needle insertion port is provided with a proximal end portion of the outer needle,
The inner needle hub is detachably attached to the hub insertion port,
The outer needle hub has a transport port that is formed at a position different from the outer needle insertion port and the hub insertion port, and is connected to a region closer to the outer needle insertion port than the sealing member in the inner space. ,
The inner needle penetrates the sealing member;
The sealing member is configured to elastically return and close the through-hole through which the inner needle has passed when the inner needle is withdrawn therefrom,
The portion on the outer needle insertion port side from the sealing member of the outer needle hub is transparent,
The portion of the outer needle hub closer to the hub insertion port than the sealing member is configured to be opaque to the extent that the inner side is less visible than the portion of the outer needle hub closer to the outer needle insertion port. An indwelling needle assembly.

Images