JP6511863B2 - Indwelling needle assembly - Google Patents

Description

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

  A closed indwelling needle is used when introducing an infusion solution such as a contrast medium supplied from an infusion set into the body, and as an indwelling needle assembly, for example, there is a catheter assembly as disclosed in Patent Document 1.

The assembly of Patent Document 1 includes a catheter, which has a catheter hub at its proximal end. The catheter hub has a side hole at the side. The side holes extend radially outward toward the proximal end side of the catheter hub, and in the side holes, an extension tube to which an infusion set or the like is attached is disposed. The extension tube is in communication with the distal side space in the catheter hub, and the inside of the catheter hub is sealed by an elastic plug (sealing member) between the distal side space and the proximal side space.
The assembly also includes an introducer needle, which is an inner needle, and a needle hub is attached to the proximal end of the introducer needle. The introducer needle is inserted from the proximal end side of the catheter hub and penetrates the catheter through the elastic plug in the catheter hub. The distal end of the introducer needle protrudes from the distal end of the catheter, and a needle hub attached to the distal end of the introducer needle is adapted to close the proximal end of the catheter hub.

JP-A-8-257129

  As a method of using the catheter assembly of Patent Document 1, for example, an introducer needle is punctured into a patient's blood vessel together with the catheter, and then the introducer needle is removed from the catheter to place the catheter in the blood vessel. After indwelling, a contrast agent is supplied from the infusion set to the extension tube and introduced into the body via the catheter hub and the catheter. The infusion set is adapted to supply high pressure infusion to the extension tube, and the distal space within the catheter hub is filled with high pressure infusion. Therefore, the elastic plug receives a large pressing force from the infusion and is pushed to the proximal space. In order to resist such pressing force, the elastic plug has a large axial length and the catheter The sliding resistance with the inner circumferential surface of the hub is increased. However, if the length in the axial direction of the elastic plug is increased, the sliding resistance (i.e., the drawing resistance) at the time of pulling out the introduction needle passing through the elastic plug is also increased, making it difficult to pull out the introduction needle.

  Therefore, the present invention aims to provide an indwelling needle assembly capable of improving the pressure resistance performance of the sealing member and suppressing an increase in the withdrawal resistance of the inner needle, thereby facilitating the treatment. .

  The indwelling needle assembly according to the present invention has an inner needle having a sharp needle tip at its tip, a hollow outer needle into which the inner needle is inserted, and an inner space, which is on the tip side of the inner space. The outer needle hub has the outer needle attached to the distal end opening and the inner needle is inserted from the proximal end opening on the proximal end side of the inner space, and is provided on the proximal end side of the inner needle An inner needle hub, a sealing member provided in the internal space and sealing between the distal end opening and the proximal end opening, and provided on the proximal opening side in the inner space; A support member configured to support the sealing member from the proximal end side, and a proximal end portion of the support member protrudes proximally from the outer needle hub and extends radially outward The locking portion is locked to the outer peripheral portion of the proximal end portion of the outer needle hub.

  According to the present invention, since the sealing member is supported by the support member whose flange is locked to the outer needle hub, even if the sealing member is pushed by the liquid introduced into the internal space, the sealing member is exposed. It is possible to prevent the needle hub from coming off. That is, the pressure resistance performance of the sealing member can be improved. Further, by improving the pressure resistance performance of the sealing member, it is possible to make the sealing member thinner, and it is possible to suppress an increase in the pullout resistance of the inner needle and to perform the treatment easily.

  ADVANTAGE OF THE INVENTION According to this invention, while improving the pressure resistance performance of a sealing member, the increase in the drawing-out resistance of an inner needle can be suppressed, and treatment can be performed simply.

It is the top view which looked at the closed type indwelling needle of 1st Embodiment of this invention from the top. It is the left view which looked at the closed type indwelling needle of FIG. 1 from the left side. It is the disassembled figure which decomposed | disassembled the closed type indwelling needle of FIG. It is sectional drawing which cut | disconnected and saw the closed type indwelling needle of FIG. 2 by cutting-line VI-VI. It is sectional drawing which cut | disconnects the sealing type | mold indwelling needle of FIG. It is sectional drawing which cut | disconnected and looked at the closed type indwelling needle of 2nd Embodiment of this invention.

  Hereinafter, the closed type indwelling needles (indwelling needle assemblies) 1 and 1A of the first and second embodiments according to the present invention will be described with reference to the drawings. The concept of the direction used in the following description is used for convenience of the description, and the direction of the configuration of the invention is not limited to that direction. In addition, the closed type indwelling needles 1 and 1A described below are merely an embodiment of the present invention. Accordingly, the present invention is not limited to the embodiments, and additions, deletions, and modifications are possible without departing from the scope of the invention.

First Embodiment
As shown in FIG. 1, the sealable indwelling needle 1 of the first embodiment is used when the needle is punctured and indwelled in a blood vessel or the like, and an infusion fluid such as a contrast agent is administered into the blood vessel with the needle. However, the closed indwelling needle 1 is not limited to one used for administration of an infusion solution such as a contrast medium, and may be used for blood collection and the like. The sealable indwelling needle 1 includes an indwelling needle main body 2, a tube 3, and a connector 4. In the following description, the distal end of the practitioner performing the needle puncturing operation on the patient with the closed indwelling needle 1 is referred to as the distal end, and the proximal end of the practitioner is referred to as the proximal end. It is called.

  As shown in FIG. 2, the indwelling needle main body 2 includes an outer needle hub 11, an outer needle 12, an inner needle 13, an inner needle hub 14, a support member 15, and a protector 16. As shown in FIG. 3, the inner needle hub 14 can be pulled away from the outer needle hub 11. As shown in FIG. 1, the outer needle hub 11 is a Y-shaped member made of a synthetic resin, and has a main body portion 21 and a tube attachment portion 22. The main body portion 21 is formed in a substantially cylindrical shape, and is formed in a tapered shape in which the outer peripheral surface of the tip end portion is tapered toward the tip end. In the main body portion 21, an inner hole 21a extends along the axis (which substantially coincides with the axis L1).

  As shown in FIG. 4, the inner hole 21 a, which is an internal space, opens proximally on the proximal end side of the main body portion 21 via the inner needle insertion port 21 b, and on the distal end side of the main body portion 21 an outer needle insertion port It is open distally via 21c. In the inner hole 21a, a rubber accommodation space 21d is formed at an axially intermediate portion, and the sealing rubber 5 is fitted and accommodated in the rubber accommodation space 21d. The sealing rubber 5 which is a sealing member is a solid substantially cylindrical member made of a synthetic rubber such as polyisoprene or a thermoplastic elastomer. The sealing rubber 5 divides the inner hole 21a into a distal end side space 21e and a proximal end side space 21f, and seals between the two spaces 21e and 21f. The front end side space 21 e is connected to the tube 3, and a tube attachment portion 22 for connecting the tube 3 is integrally provided on the outer peripheral surface (left side surface in FIG. 1) of the main body portion 21. There is. In addition, the sealing member can also employ | adopt the elastic valve body by which the slit penetrates to an up-down direction other than the sealing rubber 5 as shown in FIG. 4 is formed.

  The tube attachment portion 22 obliquely extends to the proximal side of the main body portion 21 so as to be separated radially outward from the outer peripheral surface of the main body portion 21. The tube attachment portion 22 is formed substantially in a 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, and one end thereof is connected to the tip side space 21e of the inner hole 21a via the communication port 22b. The communication passage 22a has a transport port 22c at the other end, and the tube 3 inserted from the transport port 22c is fixed to the tube attachment portion 22 (see FIG. 1).

  The tube 3 shown in FIG. 1 has flexibility, and one end thereof is fixed to the tube attachment portion 22. At the other end of the tube 3, a connector 4 is provided. The connector 4 is formed in a Y-shape, and an opening is formed at each end. Each opening is connected by a passage formed in the connector 4, and the tube 3 is attached to the opening on the tip side. Moreover, the connection part which has an external thread is formed in one of the remaining openings, and the connection part can connect the infusion set which is not shown in figure. The opening to which the infusion set or the like is connected is closed by the cap member 25 before use.

  Further, the remaining one opening is provided with an injection plug 26 which closes the opening with an elastic rubber. A syringe with a needle (not shown) is connected to the injection plug 26. Thus, the infusion set or syringe with needle or the like attached to each opening is connected to the distal side space 21 e of the main body portion 21 through the connector 4 and the tube 3. Further, the distal end side space 21e of the main body portion 21 is connected to the insertion hole 12a of the outer needle 12 inserted from the outer needle insertion port 21c. In addition to injection, a needleless connector or the like can be employed.

  As shown in FIG. 4, the outer needle 12 is a generally cylindrical thin tube made of a flexible, flexible synthetic resin such as ethylene-tetrafluoroethylene copolymer, polyurethane, polyether nylon, or polypropylene. The proximal end portion of the outer needle 12 is inserted into the main body portion 21 from the outer needle insertion port 21 c and is fixed to the distal end portion of the outer needle hub 11. The outer needle 12 has an insertion hole 12a which 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 tip of the inner needle 13 protrudes from the tip of the outer needle 12 and has a sharp needle tip 13 a formed so as to be able to puncture the blood vessel. Further, the inner needle 13 enters from the outer needle insertion port 21 c of the outer needle hub 11 and penetrates the sealing rubber 5, and the proximal end portion of the inner needle 13 extends from the inner needle insertion port 21 b to the outer needle hub 11. Protruding outside of At the proximal end of the inner needle 13, an inner needle hub 14 is provided.

  The inner needle hub 14 is formed symmetrically in the left-right direction with respect to a virtual plane including the axis L1, and is formed in an elongated substantially rectangular prism shape. In the inner needle hub 14, an attachment hole 14a having a hole diameter substantially the same as the outer diameter of the inner needle 13 is formed along the axis L1. The proximal end portion of the inner needle 13 is inserted and fixed to the distal end side of the mounting hole 14a, and the inner needle 13 extends along the axis L1 from the distal end 14b of the inner needle hub 14 to the distal side. ing. The proximal end side of the mounting hole 14a is a storage chamber in which the blood having passed through the inside of the inner needle 13 is collected, and when the blood is collected in the storage chamber 14d, the flashback can be confirmed from the outside .

  Hereinafter, the outer shape of the inner needle hub 14 will be specifically described. The inner needle hub 14 is formed in a substantially prismatic shape as described above, and as shown in FIG. 1, the side portion of the middle portion of the inner needle hub 14 is recessed inwardly and drawn so as to draw a smooth surface. There is. In addition, a plurality of ridges 31 are formed on the left and right sides of the inner needle hub 14. The plurality of ridges 31 extend in the vertical direction, and are arranged at substantially equal intervals from the distal end to the proximal end in each side surface portion. As described above, the two side portions on which the plurality of ridges 31 are disposed are configured as the grips 32 for a practitioner such as a doctor or a nurse to grip with the thumb and the middle finger, and the plurality of ridges 31 Plays the role of non-slip. Also, the upper and lower surfaces of the inner needle hub 14 are less concave than the side surfaces on both the left and right sides, but are slightly recessed inward from the tip and proximal end toward the axially intermediate portion, and are formed with smooth curved surfaces ing. The upper surface portion of the inner needle hub 14 having such a shape constitutes the finger placement portion 33, and the forefinger is pointed so that the finger tip is directed to the distal side (that is, the proximal end 21g of the main body portion 21). It can be placed on the finger placement unit 33.

  The inner needle hub 14 configured in this manner is disposed on the inner needle insertion port 21 b side of the main body portion 21. The inner needle 13 provided in the inner needle hub 14 penetrates the sealing rubber 5 from the inner needle insertion port 21 b through the proximal end space 21 f. Furthermore, the inner needle 13 is inserted through the distal end side space 21 e and the insertion hole 12 a of the outer needle 12, and the needle tip 13 a protrudes outside the outer needle 12. The proximal end side portion of the inner needle 13 protrudes outward from the inner needle insertion port 21 b of the main body portion 21, and the inner needle hub 14 is disposed so as to face the proximal end space 21 f of the main body portion 21. The support member 15 is accommodated in the proximal end space 21 f of the main body portion 21 of the outer needle hub 11, and the inner needle hub 14 holds the proximal end of the main body portion 21 across the annular locking portion 15 e of the support member 15. It is arrange | positioned so that the part 21g may be adjacent.

  The supporting member 15 shown in FIG. 5 is a substantially cylindrical member made of a synthetic resin, and has a supporting member main body 15a formed in a substantially cylindrical shape. The outer diameter of the support member main body 15 a is formed to be substantially the same as the inner diameter of the proximal end portion 21 g of the main body portion 21. An inward flange 15b is formed on the inner peripheral surface of the distal end portion of the support member main body 15a so as to protrude radially inward over the entire circumferential direction, and all around the outer peripheral portion of the distal end portion of the support member main body 15a An outwardly directed outward flange 15c is formed over the circumference. The support member 15 is fitted in the main body portion 21 in a state where the inward flange 15b is in contact with the proximal end of the sealing rubber 5, and is accommodated in the proximal end space 21f. The peripheral portion is supported from the proximal side. Further, on the inner peripheral surface on the base end side of the main body portion 21, an annular groove 21h is formed at the position corresponding to the outward facing flange 15c of the support member 15 and is recessed radially outward over the entire circumferential direction. An outward flange 15c is fitted in and engaged with 21h. By engaging in this manner, the sealing rubber 5 pushed to the proximal side can be supported from the proximal side by the support member 15.

  The proximal end 15d of the support member main body 15a protrudes from the proximal end 21g of the main body 21 to the proximal side, and the outer peripheral surface of the proximal end 15d is an annular locking portion 15e all around the circumferential direction. Are integrally formed. The annular locking portion 15e which is a locking portion extends radially outward from the base end portion 15d, and a cross section perpendicular to the circumferential direction is formed in a hook shape (for example, a substantially J shape) . That is, the distal end of the annular locking portion 15e is positioned radially outward from the proximal end 15d, and the distal end portion 15f of the annular locking portion 15e and the support member main body 15a The proximal end 21g is to be inserted. The tip end portion 15f of the annular locking portion 15e is a portion which is folded inward in the radial direction in the annular locking portion 15e.

  On the other hand, a flange 21i is formed on the outer peripheral surface of the base end portion 21g of the main body portion 21 over the entire circumferential direction, and the flange 21i protrudes outward in the radial direction. The flange 21i is located between the distal end portion 15f of the annular locking portion 15e and the proximal end portion 15g of the annular locking portion 15e, and is engaged with the annular locking portion 15e. The proximal end portion 15g of the annular locking portion 15e is a portion extending outward in the radial direction from the proximal end portion 15d. As the flange 21i is engaged with the annular locking portion 15e, the support member 15 is locked to the outer peripheral surface of the base end 21g of the main body portion 21, and the relative displacement of the support member 15 with respect to the main body portion 21 in the axial direction is Be suppressed.

  The support member 15 configured in this manner is inserted from the inner needle insertion port 21b of the main body portion 21 and engages the outward flange 15c with the annular groove 21h and locks the annular locking portion 15e with the flange 21i. It is accommodated so that it may not slip out in the main-body part 21 by making it do. Therefore, even if the sealing rubber 5 is pushed to the proximal side, it is possible to prevent the support member 15 from coming off the main body portion 21 together with the sealing rubber 5, and the pressure resistance performance of the sealing rubber 5 can be improved. . In particular, in the closed type indwelling needle 1, the pressure resistance can be improved without increasing the axial length of the elastic plug by locking the annular locking portion 15e to the flange 21i.

  Further, a convex portion 41 is formed on the annular locking portion 15 e of the support member 15. The convex portion 41 protrudes upward from the annular locking portion 15e, and a cross section perpendicular to the vertical direction is formed in a rectangular shape. The upper surface of the convex portion 41 is positioned higher than the finger placement portion 33 of the inner needle hub 14 so that the finger of the finger placed on the finger placement portion 33 can be hung. Specifically, the fingertip can be pressed against the convex portion 41 from the rear side, or the fingertip can be placed on the convex portion 41. The inner needle hub 14 held can be pulled down in a stable posture by pressing the fingertip from the rear side by pressing the convex portion 41, and when the fingertip is put on the convex portion 41, the support member 15 and the outer needle hub 11 can be pressed against the skin of the patient, the posture of the outer needle hub 11 can be stabilized, and the inner needle hub 14 can be pulled out.

  Furthermore, a pair of engagement grooves 15h are formed in the annular locking portion 15e. The pair of engagement grooves 15h are grooves extending in the vertical direction, and are respectively formed at the base end of the annular locking portion 15e at an interval in the horizontal direction. At the tip 14b of the inner needle hub 14, an engagement piece 14c is formed at a position corresponding to each of the engagement grooves 15h, and the engagement piece 14c is engaged with and engaged with the engagement groove 15h. ing. The support member 15 can not be rotated relative to the inner needle hub 14 by engaging the engagement piece 14c in the engagement groove 15h. On the other hand, the support member 15 can rotate relative to the outer needle hub 11 about the axis L1, and when the inner needle hub 14 is rotated about the axis L1 with respect to the outer needle hub 11, the inner needle hub It is supposed to rotate with 14. The distal end portion of the protector 16 may be accommodated in the support member 15 configured as described above, as shown in FIG. 5.

  The protector 16 is configured to cover and protect the needle tip 13a when the inner needle 13 is pulled out from the outer needle 12 and the outer needle hub 11 (see FIG. 3). The protector 16 has a protector main body 51 and a holder 52. The protector body 51 is made of various metal materials such as stainless steel, aluminum, aluminum alloy, titanium, titanium alloy, copper, copper alloy, etc., and is a substantially rectangular box-shaped member extending in the axial direction. The protector body 51 is formed with a hole through which the inner needle 13 is inserted. Moreover, the protector main body 51 has the flexible side plates 53 and 54 as a side plate which opposes right and left. When the two flexible side plates 53, 54 are pushed inward, the needle tip 13a is covered and protected from the tip side.

  In addition, an engagement portion (not shown) that bulges radially outward is formed on the tip end side of the inner needle 13, and when the engagement portion pulls out the inner needle 13 with respect to the protector main body 51. Is engaged with the protector main body 51. The holder 52 has a function of housing the protector main body 51 therein and closing the pair of flexible side plates 53 and 54 of the protector main body 51. That is, when the inner needle 13 is pulled backward in a state of being engaged with the engagement portion of the inner needle 13, the protector main body 51 is relatively displaced rearward with respect to the holder 52. When the protector body 51 is relatively displaced rearward, the pair of flexible side plates 53, 54 is pushed inward by the holder 52. Thus, the needle tip of the inner needle 13 is covered and protected by the pair of hooks 53a and 54a.

  The protector 16 is inserted into the support member 15, and its tip end portion is located in the support member 15 as described above. That is, the tip end side portion of the holder 52 of the protector 16 is fitted in the support member 15 and accommodated in the outer needle hub 11. On the other hand, the proximal end portion of the holder 52 and the proximal end portion of the protector main body 51 project from the outer needle hub 11, and these portions are accommodated on the distal end side of the inner hole 14 e of the inner needle hub 14.

  In the sealable indwelling needle 1 configured in this manner, the blade surface of the needle tip 13a of the inner needle 13 is inclined, and the inner needle 13 positions each of the pair of engagement pieces 14c on the left and right sides. It is attached to the inner needle hub 14 so that its blade face is directed upward when it is turned on. Therefore, when the engagement piece 14c is engaged with the engagement groove 15h and the inner needle hub 14 is attached to the support member 15, the direction of the blade surface of the needle tip 13a of the inner needle 13 It becomes almost the same. Therefore, in the closed type indwelling needle 1, the direction of the blade surface of the needle tip 13 a of the inner needle 13 can be easily confirmed.

  In addition, the outer needle hub 11 has a nonslip 27 as shown in FIG. The slip stopper 27 is for preventing slip against the skin of the patient, and is formed by a plurality of asperities. In the present embodiment, the anti-slip member 27 is constituted by three ridges 27a to 27c, and the ridges 27a to 27c are arranged at equal intervals on at least the upper and lower surfaces of the middle portion of the main body portion 21. The lower non-slip contact 27 with the patient's skin can prevent the patient from sliding against the skin.

  Also, the tops of the three ridges 27a to 27c are formed flat so that they can be painless or relieved when they come in contact with the patient's skin and the fingers of the practitioner. Furthermore, the heights of the respective ridges 27a to 27c are formed to the same degree, and the tops of the three ridges 27a to 27c are located on substantially the same plane. The flat surface is inclined obliquely upward from the outer peripheral surface of the main body portion 21 toward the outer peripheral surface of the tube attachment portion 22. Further, the height of the outer peripheral portion of the annular locking portion 15e of the support member 15 is also adjusted so as not to protrude from the plane, causing pain when the non-slip portion 27 and the annular locking portion 15e contact the skin. Not or can be reduced. The upper slip stopper 27 is formed in the same manner as the lower slip stopper 27 and is similar to the lower slip stopper 27 when the outer needle hub 11 is used upside down as described later. It can produce an effect.

Below, the operation | work at the time of puncturing the sealing type indwelling needle 1 and extracting it from the outer needle 12 is demonstrated.
As shown in FIGS. 1 and 2, in the closed indwelling needle 1, the support member 15 is accommodated in the main body portion 21, and the puncture is performed in a state where the inner needle hub 14 is attached to the support member 15. The practitioner holds each of the grips 32 of the inner needle hub 14 with two fingers (for example, the thumb and the middle finger), and takes into consideration the position and direction of the tube 3 after puncturing, the direction in which the tube 3 wants to That is, the attitude of the outer needle hub 11 is changed (for example, the outer needle hub 11 is turned upside down) so as to face the extending direction). After changing, the inner needle hub 14 is rotated relative to the outer needle hub 11 together with the support member 15 so that the convex portion 41 is directed upward and the blade surface of the needle tip 13a of the inner needle 13 is directed upward. When the blade surface is turned upward, the practitioner applies the index finger of the hand holding the inner needle hub 14 to the convex portion 41 or places it on the convex portion 41 to stabilize the posture of the outer needle hub 11 and seal it. The indwelling indwelling needle 1 is punctured from the needle tip 13a into the blood vessel of the patient.

  After puncturing, it is confirmed that the outer needle 12 has reached the blood vessel by the flashback which flows through the inside of the inner needle 13 and flows into the reservoir 14 d of the inner needle hub 14 and is accumulated. After confirmation, the practitioner grips the inner needle hub 14 to withdraw the inner needle 13 from the outer needle 12. Furthermore, the practitioner presses and fixes the outer needle hub 11 to the affected part of the patient by placing the fingertip of the forefinger on the convex portion 41 or placing it on the convex portion 41. From this state, the practitioner moves the thumb and the middle finger to the proximal side while keeping the fingertip of the forefinger pressed against the convex portion 41, and pulls the inner needle hub 14 away from the support member 15. Preferably, no large protrusion is formed on the surface of the finger placement unit 33 so that the forefinger is not caught on the finger placement unit 33 when the finger placement unit 33 is pulled out.

  By pulling the inner needle hub 14 away from the support member 15, the inner needle 13 is eventually pulled out of the outer needle 12. When the thumb and the middle finger are further moved to the proximal side, the needle tip 13 a of the inner needle 13 comes out of the sealing rubber 5 and fits in the protector main body 51. The flexible side plates 53 and 54 are pushed inward by pulling out the inner needle hub 14 even after it is settled, and the needle tip 13 a is covered and protected by the flexible side plates 53 and 54. By further moving, the needle tip 13 a is pulled out of the inner needle insertion port 21 b of the main body portion 21 together with the protector 16.

  After the inner needle 13 is removed, an infusion set is attached to one opening of the connector 4, and an infusion (for example, a contrast agent) is supplied from the infusion set to the tube 3 via the connector 4. The infusion solution is sent from the tube 3 to the insertion hole 12a of the outer needle 12 through the tip side space 21e of the outer needle hub 11, and introduced into the blood vessel of the patient. Although the sealing rubber 5 is pressed to the proximal end space 21f by the infusion flowing through the distal end space 21e, the support member 15 supports the sealing rubber 5 so as to resist the pressure by the infusion. Therefore, although the infusion set is supplied with high supply pressure to the tube 3 from the infusion set, the sealing rubber 5 is prevented from coming off the inner needle insertion port 21b even after the inner needle hub 14 is removed from the support member 15 Can.

  Further, the support member 15 is locked to the main body portion 21 of the outer needle hub 11 by the annular locking portion 15 e, and the support member 15 does not fall off from the main body portion 21. Therefore, since the sealing rubber 5 is firmly supported by the support member 15, even if an infusion is supplied at a high supply pressure, the sealing rubber 5 can withstand without being pulled out. Thus, the pressure resistance performance of the sealing rubber 5 can be improved. Further, by improving the pressure resistance performance of the sealing rubber 5, the thickness of the sealing rubber 5 can be reduced (that is, the length in the axial direction can be shortened). Thereby, an increase in pull-out resistance when pulling out the inner needle 13 from the sealing rubber 5 can be suppressed, and the treatment can be performed easily.

  In the sealable indwelling needle 1 configured in this manner, the opposite side of the hand that holds the inner needle hub 14 (for example, the right hand) so that the tube 3 does not get in the way when holding the inner needle hub 14 It is preferable to position the tube attachment portion 22 on the left side) when holding the However, in the conventional closed indwelling needle, it is premised that the inner needle hub 14 is gripped with the right hand, so when gripping the inner needle hub 14 with the left hand, the practitioner turns the closed indwelling needle upside down If this is done, the blade surface of the needle tip 13a will face downward.

  In order to solve such a problem, in the closed type indwelling needle 1, the inner needle hub 14 and the support member 15 are configured to be rotatable relative to the outer needle hub 11 around the axis L1, and to rotate them. The blade surface of the needle tip 13a and the convex portion 41 can be directed upward (that is, the position of the convex portion 41 can be changed). Therefore, even if the position of the tube attachment portion 22 is changed to the left or right, the needle tip 13a can be turned upward by relatively rotating the inner needle hub 14. That is, regardless of the dominant hand, the closed indwelling needle 1 can be used. Further, since the inner needle hub 14 is symmetrically formed, the left and right hands can be punctured in the same manner, so that the treatment can be further simplified.

Second Embodiment
The closed indwelling needle 1A of the second embodiment is similar in configuration to the closed indwelling needle 1 of the first embodiment. In the following, the configuration of the sealable indwelling needle 1A of the second embodiment will be mainly described in terms of differences from the sealable indwelling needle 1 of the first embodiment, and the same configurations will be given the same reference numerals for illustration and explanation Omit.

  As shown in FIG. 6, the sealable indwelling needle 1 </ b> A includes a plug member 17 in place of the protector 16. The plug member 17 is made of an elastic member such as synthetic rubber, and is formed in a substantially cylindrical shape. The plug member 17 is inserted into and fitted in the support member 15, and the plug member 17 is pushed in until the tip end abuts on the sealing rubber 5.

  The sealed indwelling needle 1A configured in this manner prevents blood or the like adhering to the proximal end of the sealing rubber 5 from the needle tip 13a from being drawn out of the outer needle hub 11 when the inner needle 13 is pulled out. Can.

  In addition, the closed indwelling needle 1A of the second embodiment has the same function and effect as the closed indwelling needle 1.

Other Embodiments
In the sealable indwelling needle 1 of the first and second embodiments, the convex portion 41 is formed on the support member 15, but the convex portion 41 is not necessarily formed. Further, the convex portions 41 may be formed on both the upper and lower sides of the annular locking portion 15 e of the support member 15. In addition, the convex portion 41 may be formed on the support member 15. Furthermore, the non-slip portion 27 need not necessarily be formed on the main body portion 21 of the outer needle hub 11, and may be formed only on the lower surface of the main body portion 21. Moreover, the shape of the convex part 41 does not necessarily need to be plate shape of a cross-sectional rectangle, and may be hemispherical shape or triangle shape.

  Moreover, although the non-slip part 27 is comprised by convex-lined part 27a-27c, it is not necessary to be necessarily a convex line and you may comprise the non-slip 27 by forming multiple hemispherical surface-shaped protrusions. In addition, the non-slip member 27 may be provided with an adhesive member (such as an adhesive mat) or a member having a friction increasing property (rough surface member) having a larger friction than the remaining portion, or a process to increase friction (rough surface processing) Etc.) may be applied to the outer needle hub 11 or the like.

  Further, in the first and second closed type indwelling needles 1 and 1A, the annular locking portion 15e is formed at the proximal end 15d of the support member main body 15a, but the plurality of locking portions are the outer periphery of the proximal end 15d It may be formed to be arranged at equal intervals on the surface. Similar to the annular locking portion 15e, the locking portion is formed in a bowl-like (for example, substantially J-shaped) cross section perpendicular to the circumferential direction, and the support member 15 is engaged with the outer needle hub 11 by engaging with the flange 21i. It is configured to be locked. Further, the locking structure between the support member 15 and the outer needle hub 11 is not necessarily limited to the above-described structure. For example, an L-shaped groove opened at the base end is formed on the outer peripheral surface of the main body portion 21, and the tip of the locking portion of the support member 15 is inserted from the opening of the groove and rotated around the axis. May be locked to the outer needle hub 11. In the embodiment described above, the case where the first and second closed indwelling needles 1 and 1A are operated with one hand is described as an example, but the first and second closed indwelling needles 1 and 1A are operated with both hands Well, it is not limited to operating with one hand.

F Index finger 1, 1 A Sealed indwelling needle 3 Tube 4 Connector 5 Sealing rubber (Sealing member)
11, 11A Outer Needle Hub 12 Outer Needle 13 Inner Needle 13a Needle Tip 14 Inner Needle Hub 15 Support Member 15e Annular Locking Part 15g Base End Part 16 Protector 17 Plug Member 21 Body Part 21a Inner Hole (Internal Space)
21b Inner needle insertion port (proximal end opening)
21c Outer needle insertion port (tip end side opening)
21d rubber accommodation space 21i flange 22 tube mounting portion 32 grip portion 41 convex portion

Claims (3)

An inner needle having a sharp needle point at its tip,
A hollow outer needle through which the inner needle is inserted;
The inner needle is inserted into the distal end side opening having the internal space, which is on the distal end side of the internal space, and the proximal end side opening on the proximal end side of the internal space. An outer needle hub having a body portion on which a tube is formed, and a tube attachment portion formed on a side surface of the body portion to which a tube is attached ;
An inner needle hub provided on the proximal end side of the inner needle;
Provided in front Symbol Internal space, and a sealing member for sealing between the proximal-side opening and the distal end side opening,
Provided at the base end side opening side in the inner portion space, and a supporting member supporting the sealing member from the proximal end side,
The inner needle hub is configured to be rotatable relative to the outer needle hub together with the support member,
The proximal end of the support member has a locking portion projecting proximally from the outer needle hub and extending radially outwardly.
The locking portion is locked to the outer peripheral portion of the proximal end portion of the outer needle hub, and when the support member rotates with respect to the outer needle hub, the support member is a rotation center line Configured to restrict relative displacement with respect to the outer needle hub along the
Indwelling needle assembly. The locking portion has a radially outwardly projecting convex portion.
The indwelling needle assembly according to claim 1 . A protector inserted into the outer needle hub and withdrawn from the outer needle hub together with the inner needle to protect the needle tip of the inner needle;
The support member is formed in a tubular shape,
The protector indwelling needle assembly according to claim 1 or 2 is housed is inserted into the support member.