JP2013034557A - Lock type connection tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock type connection tool for reliably keeping a connection state between a male connector and a female connector.SOLUTION: The lock type connection tool includes: a male connector 10 where a connection insertion part 11 is formed at the distal end; a female connector 14 which has a fitting part 14c to which the connection insertion part 11 is inserted and fitted and where a male screw part 14b is formed on the outer circumferential surface; and a lock means 12 for screwing a female screw part 12a onto the male screw part 14b thereby to lock the connection state between the male connector 10 and the female connector 14. The connection insertion part 11 includes an elastic member 13 that is to be abutted onto the female screw part 12a on the inner peripheral surface of the lock means 12, while generating repulsion force by elastic force, in a state where the connection state between the male connector 10 and the female connector 14 is locked by the lock means 12.

Description

  The present invention relates to a lock-type connector provided with locking means for locking the connection state between a male connector and a female connector.

  A blood circuit for circulating a patient's blood extracorporeally at the time of blood purification treatment is usually composed of an arterial blood circuit and a venous blood circuit made of a flexible tube. A blood purifier (dialyzer or the like) for purifying extracorporeal blood is connected to each proximal end of the circuit, and an arterial puncture needle and a venous puncture that can be punctured by a patient are connected to each distal end. A needle is attached.

  Locking connectors called shunt connectors are formed at the tips of the arterial blood circuit and the venous blood circuit, respectively. For example, a tube extending from the arterial puncture needle and the venous puncture needle and the arterial side are provided. The distal end of the tube constituting the blood circuit and the venous blood circuit can be connected by the lock-type connector. Such a conventional locking connector is connected to a male connector connected to the distal ends of tubes constituting the arterial blood circuit and the venous blood circuit, and a tube extending from the arterial puncture needle and the venous puncture needle. A female connector, and a male connector fitted into the female connector for connection, and a lock ring for locking the connection between the male connector and the female connector.

  More specifically, the lock ring is attached to the male connector, and has a female screw portion that can be screwed to the male screw portion formed on the outer peripheral surface of the female connector on the inner peripheral surface. The connection state between the male connector and the female connector is locked by screwing the part into the male screw part (see, for example, Patent Document 1). Thereby, the arterial puncture needle and the venous puncture needle can be connected to the tips of the arterial blood circuit and the venous blood circuit, respectively, and blood can be obtained by puncturing the patient with the arterial puncture needle and the venous puncture needle. The male connector can be disconnected from the female connector after the lock ring is released in an emergency or when the patient temporarily leaves the place.

Utility Model Registration No. 3137386

However, the conventional lock type connector has the following problems.
The male connector and the female connector are usually hard parts (parts made of a hard material) manufactured in accordance with JIS (ISO) standards. However, due to the characteristics of the hard parts, the female thread portion of the lock ring and the female connector are used. When the threaded engagement with the male threaded portion is slightly loosened, the fitting force between the male threaded portion and the female threaded portion is reduced, and there is a possibility that the lock ring will loosen and come off at once.

  In addition, the fitting portion of the male connector with the female connector is a luer taper whose diameter increases from the distal end to the proximal end, but the male connector and the female connector are tapered fittings of hard parts to each other. The repulsive force loosens due to slight impact, vibration, temperature change, etc., and there is a possibility that the fitting becomes insufficient and liquid leakage or air suction is caused. In addition, such a malfunction is not limited to the shunt connector, and can be connected by a male connector and a female connector, and can occur in common in all lock-type connectors that lock the connection state by a locking means such as a lock ring. .

  This invention is made | formed in view of such a situation, and it is providing the lock type connection tool which can maintain the connection state of a male connector and a female connector reliably.

  According to the first aspect of the present invention, a tube capable of circulating a liquid is connected to the base end portion, and a male connector having a connection insertion portion formed at the distal end portion can be inserted into the connection insertion portion to be fitted. A female connector having a fitting portion, connected to the male connector by fitting of the connection insertion portion with respect to the fitting portion and being able to circulate liquid, and having a male screw portion formed on the outer peripheral surface; A female screw portion that can be screwed to the male screw portion is formed on the inner peripheral surface of the male connector and the female connector between the male connector and the female connector by screwing the female screw portion to the male screw portion. In the lock-type connector having a lock means for locking the connection state, the connection insertion portion is connected to the lock connector in a state where the connection state between the male connector and the female connector is locked by the lock means. And an elastic member that may contact while causing a repulsive force by elasticity against the inner peripheral surface of the click means.

  According to a second aspect of the present invention, in the locking connector according to the first aspect, the elastic member is a ring-shaped member having elasticity.

  According to a third aspect of the present invention, in the locking connector according to the second aspect, the elastic member is formed of a ring-shaped member separate from the connection insertion portion, and the surface of the connection insertion portion is heated by heating. It is characterized in that it can be fixed by thermal adhesion.

  According to a fourth aspect of the present invention, in the locking connector according to any one of the first to third aspects, the elastic member is connected in a state where the connection insertion portion is fitted to the fitting portion. It is characterized by being sandwiched between the insertion part and the fitting part and capable of bulging in the radial direction in the process of locking by the locking means.

  According to a fifth aspect of the present invention, in the locking connector according to the fourth aspect, the male connector has a stepped portion formed at a rear end portion of the connection insertion portion in order to prevent the locking means from coming off. The elastic member is arranged to be adjacent to each other between the opening edge surface of the fitting portion and the stepped portion in a state where the connection insertion portion is fitted to the fitting portion. Features.

  A sixth aspect of the present invention is the locking connector according to any one of the first to fifth aspects, wherein the tube connected to the male connector constitutes a blood circuit for circulating the patient's blood extracorporeally. In addition, the female connector is connected to a puncture needle that can be punctured by a patient or a tube to which the puncture needle is attached.

  A seventh aspect of the present invention is a blood circuit comprising the locking connector according to any one of the first to sixth aspects.

  According to the first aspect of the present invention, in the connection insertion portion, a repulsive force is generated on the inner peripheral surface of the lock means in a state where the connection state between the male connector and the female connector is locked by the lock means. Since the elastic member which can contact | abut while providing is provided, the connection state of a male connector and a female connector can be maintained reliably.

  According to the invention of claim 2, since the elastic member is composed of a ring-shaped member having elasticity, the contact area with respect to the female screw portion of the lock means can be made larger than that of the rib-shaped elastic member, The connection state between the male connector and the female connector can be more reliably maintained.

  According to the invention of claim 3, the elastic member is made of a ring-shaped member that is separate from the connection insertion portion, and can be fixed by thermal adhesion to the surface of the connection insertion portion by heating. The elastic member can be formed in the connection insertion portion at a lower cost than that in which the elastic member is integrally formed in the connection insertion portion, and the elastic member is more firmly attached to the connection insertion portion by heating. Can be fixed.

  According to the inventions of claims 4 and 5, the elastic member is in a state of being sandwiched between the connection insertion portion and the fitting portion in a state where the connection insertion portion is fitted to the fitting portion, and the locking means. In the locking process by the locking means, in the locked state by the locking means, the connection state between the male connector and the female connector can be maintained more firmly, and at the time of the locking operation by the locking means or The operating force required at the time of the unlocking operation can be reduced. Furthermore, since the elastic member comes into contact with the male connector and the female connector to make it liquid-tight, liquid leakage can be prevented.

  According to the invention of claim 6, the tube connected to the male connector constitutes a blood circuit for circulating the patient's blood extracorporeally, and the female connector has a puncture needle capable of puncturing the patient or the puncture needle. Since it is connected to the attached tube, it can be applied to a shunt connector that connects the blood circuit and the puncture needle.

  According to invention of Claim 7, the blood circuit which can maintain the connection state of a male connector and a female connector reliably can be provided.

The schematic diagram which shows the blood circuit to which the lock-type connector which concerns on embodiment of this invention is applied. The perspective view which shows the lock-type connector (before connection) which concerns on 1st Embodiment of this invention. It is a figure which shows the male connector in the lock type connection tool, (a) Side view (b) Sectional drawing It is a figure which shows the female connector in the lock type connection tool, (a) Side view (b) Sectional drawing Front view and side view showing an elastic member in the locking connector The perspective view which shows the lock type connector (state after a connection and before a lock | rock) Sectional drawing which shows the lock type connector (state after connection and before lock) The perspective view which shows the lock-type connector (locked state) Sectional drawing which shows the locking type connection device (locked state) The perspective view which shows the lock-type connector (before connection) which concerns on other embodiment of this invention. Front view and side view showing an elastic member in the locking connector Sectional drawing which shows the locking type connection device (locked state) The perspective view which shows the lock-type connector (before connection) which concerns on 2nd Embodiment of this invention. It is a figure which shows the male connector in the lock type connection tool, (a) Side view (b) Sectional drawing It is a figure which shows the female connector in the lock type connection tool, (a) Side view (b) Sectional drawing The perspective view which shows the lock type connector (state after a connection and before a lock | rock) Sectional drawing which shows the lock type connector (state after connection and before lock) The perspective view which shows the lock-type connector (locked state) Sectional drawing which shows the locking type connection device (locked state)

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The lock-type connector according to the present embodiment is applied to a blood circuit having an arterial blood circuit 1 and a venous blood circuit 2 as shown in FIG. Such a blood circuit circulates the patient's blood extracorporeally for artificial dialysis treatment, and performs blood purification or the like in the middle thereof. As shown in the figure, the arterial side having an arterial puncture needle a connected to the tip is provided. It is mainly composed of a blood circuit 1 and a venous blood circuit 2 having a venous puncture needle b connected to the tip.

  The proximal ends of the arterial blood circuit 1 and the venous blood circuit 2 are connected to a dialyzer 3 as a blood purifier, and a blood flow path is formed in the blood. The dialyzer 3 is connected to a dialysate introduction line L1 and a dialysate discharge line L2, respectively, and a flow path through which the dialysate can flow is formed. When blood circulating outside the body passes through the blood flow path and the dialysate passes through the dialysate flow path, unnecessary substances (spent waste) in the blood can be removed by dialysis to the dialysate side.

  In the middle of the arterial blood circuit 1, an ironing type blood pump 4 for driving while squeezing a tube constituting the flow path of the arterial blood circuit 1 is disposed, and in the middle of the venous blood circuit 2. The air trap chamber 5 for defoaming is connected, and is configured to remove the air in the blood generated during the extracorporeal circulation process and return the blood to the patient's body. In addition, a T-shaped tube or a rubber button (not shown) is connected in the middle of the arterial blood circuit 1 and the venous blood circuit 2 so that blood collection, drug administration, etc. can be performed while performing dialysis treatment. .

  The arterial blood circuit 1 and the venous blood circuit 2 are each made of a flexible tube so that the blood of the patient, priming fluid, and the like can be circulated. Further, the distal ends of the arterial blood circuit 1 and the venous blood circuit 2 are a tube 6 extending from the arterial puncture needle a and a tube extending from the venous puncture needle b via the locking connectors 8 and 9, respectively. 7 are connected to each other. Thereby, the blood of the patient collected from the arterial puncture needle a circulates through the tube 6 and the arterial blood circuit 1, and after blood purification is performed by the dialyzer 3, circulates through the venous blood circuit 2 and the tube 7. Then, it is returned to the patient via the venous puncture needle b.

  The lock type connector (8, 9) according to the first embodiment of the present invention connects the tube (6, 7) and the arterial blood circuit 1 or the venous blood circuit 2 so as to communicate the respective flow paths. As shown in FIGS. 2 to 4, it is mainly composed of a male connector 10, a female connector 14, a locking means 12, and an elastic member 13. In addition, in order to avoid duplication of description, the lock-type connector 8 that connects the artery-side blood circuit 1 and the tube 6 will be described in detail below, but the lock-type connection that connects the vein-side blood circuit 2 and the tube 7. The tool 9 has the same configuration.

  The male connector 10 is connected to a tube (a flexible tube constituting the arterial blood circuit 1 in the present embodiment) capable of circulating a liquid at the proximal end portion 10a, and a connection insertion portion 11 is formed at the distal end portion. It consists of a resin (hard resin) part. The male connector 10 has a through-hole formed in the axial direction, and the through-hole forms a flow path α (see FIG. 3) through which a liquid can flow. The connection insertion part 11 consists of the site | part integrally shape | molded by the front end side of the male connector 10, and has a taper surface diameter-reduced toward the front-end | tip.

  The female connector 14 has a fitting portion 14c that can be fitted by inserting the connection insertion portion 11 of the male connector 10, and is connected to the male connector 10 by fitting of the connection insertion portion 11 to the fitting portion 14c. It is made of a resin (hard resin) part in which a liquid can be circulated and an external thread part 14b is formed on the outer peripheral surface. A through hole is formed in the female connector 14 in the axial direction, and the through hole constitutes a flow path β (see FIG. 4) through which a liquid can flow. In addition, the code | symbol 14a in the figure has shown the connection part connected with the tube 6. FIG.

  As shown in FIG. 3, the locking means 12 is made of a substantially cylindrical resin (hard resin) component, is slidably attached to the axial direction of the male connector 10, and is formed on the male connector 10. It is retained by the stepped portion 10b. The locking means 12 has a female screw portion 12a that can be screwed to the male screw portion 14b of the female connector 14 on the inner peripheral surface, and the male screw connector 10a by screwing the female screw portion 12a to the male screw portion 14b. And the female connector 14 can be locked (see FIG. 9).

  The elastic member 13 has a predetermined elasticity and is fixed to the connection insertion portion 11 of the male connector 10. In this embodiment, the elastic member 13 has an outer peripheral surface 13a and a hole 13b as shown in FIG. The connection insertion portion 11 is formed of a ring-shaped member that is a separate member. However, the diameter (inner diameter) of the hole 13b of the elastic member 13 is approximately the same as the diameter (outer diameter) of the portion to which the elastic member 13 is attached in the connection insertion portion 11, and the connection insertion portion 11 is inserted into the hole 13b. Can be press-fitted and fixed.

  Further, the elastic member 13 is formed with an inner peripheral surface of the locking means 12 (in this embodiment, a female screw portion 12a in a state where the connection state between the male connector 10 and the female connector 14 is locked by the locking means 12). Can be abutted while generating a repulsive force due to elasticity, and is made of, for example, a soft vinyl chloride resin. That is, as shown in FIG. 9, the elastic member 13 is attached to the connection insertion portion 11, and has a dimension t (so that the outer peripheral surface 13 a comes into contact with the inner peripheral surface (female screw portion 12 a) of the locking means 12. (See FIG. 5).

  In order to connect and lock the male connector 10 and the female connector 14 using such a lock-type connector, first, the male connector 10 is connected to the fitting portion 14c of the female connector 14 as shown in FIGS. The insertion part 11 is inserted and fitted. Then, the female screw portion 12a is screwed into the male screw portion 14b by rotating the lock means 12 while moving in the axial direction (that is, moving forward to the tip side).

  Thus, when the female screw portion 12a of the locking means 12 is screwed into the male screw portion 14b, the connection state between the male connector 10 and the female connector 14 is locked as shown in FIGS. . At this time, the elastic member 13 is slightly compressed in the radial direction by the outer peripheral surface 13a coming into contact with the female threaded portion 12a of the locking means 12, and the elastic means 13 is repelled by elasticity. They are in contact with each other while generating force.

  Therefore, since the repulsive force by elasticity can be given to the lock means 12 in the locked state, it is possible to suppress the lock means 12 from moving in the direction in which the lock is loosened by the repulsive force. 10 and the female connector 14 can be reliably maintained.

  Here, since the elastic member 13 according to the present embodiment is made of soft vinyl chloride resin and is made of a ring-shaped member that is separate from the connection insertion portion 11, the surface of the connection insertion portion 11 is heated. It can be fixed by thermal adhesion. Accordingly, the elastic member 13 can be formed in the connection insertion portion 11 at a lower cost than that in which the elastic member 13 is formed integrally with the connection insertion portion 11, and the elastic member 13 can be more heated by heating. It can be firmly fixed to the connection insertion portion 11.

  In particular, in this embodiment, since it is applied to a blood circuit which is one of medical devices, steam sterilization or the like is usually performed in the manufacturing process. According to the present embodiment, the elastic member 13 can be fixed by thermal agglutination with respect to the surface of the connection insertion portion 11 by heating at the time of steam sterilization. Application step and the like can be eliminated, and the elastic member 13 can be formed in the connection insertion portion 11 at a lower cost.

  However, the elastic member 13 is not limited to the one shown in FIG. 5 and may be an elastic member 13 ′ composed of a ring-shaped member having flat end surfaces as shown in FIGS. 10 and 11, for example. The elastic member 13 ′ has an outer peripheral surface 13′a and a hole 13′b as in the above embodiment, and is formed of a ring-shaped member separate from the connection insertion portion 11, and has a diameter (inner diameter) of the hole 13′b. ) Is approximately the same size as the diameter (outer diameter) of the portion to which the elastic member 13 ′ is attached in the connection insertion portion 11.

  The elastic member 13 ′ is press-fitted and fixed to the connection insertion portion 11 of the male connector 10, and the connection state between the male connector 10 and the female connector 14 is locked by the locking means 12 as shown in FIG. In this state, it can come into contact with the female threaded portion 12a of the locking means 12 while generating a repulsive force due to elasticity. Thereby, it can suppress that the locking means 12 moves to the direction which a lock | rock loosens, and the connection state of the male connector 10 and the female connector 14 can be maintained reliably.

  In addition, it may replace with the elastic members 13 and 13 'which concern on the said embodiment, and was integrally molded with respect to the said connection insertion part 11. FIG. Furthermore, the elastic members 13 and 13 'are sufficient if they can abut against the female screw portion 12a of the locking means 12 while generating a repulsive force due to elasticity, and instead of soft vinyl chloride resin as a material, for example, silicon or It can be a synthetic rubber or the like. Moreover, it can replace with the elastic members 13 and 13 'which consist of a ring-shaped member, and can be the rib-shaped elastic member etc. which were formed in multiple in the circumferential position in the connection insertion part 11.

  According to the first embodiment, the connection insertion portion 11 has an inner peripheral surface (female screw portion) of the locking means 12 in a state where the connection state between the male connector 10 and the female connector 14 is locked by the locking means 12. 12a) is provided with the elastic member 13 capable of abutting while generating a repulsive force due to elasticity, so that the connection state between the male connector 10 and the female connector 14 can be reliably maintained.

  Further, since the elastic member 13 is made of a ring-shaped member having elasticity, the contact area of the locking means 12 with respect to the female screw portion 12a can be made larger than that of the rib-shaped elastic member. The connection state with the female connector 14 can be more reliably maintained. Further, according to the present embodiment, the elastic member 13 is attached to the female screw portion 12a in the locking process by the locking means 12 (that is, the screwing process between the female screw portion 12a and the male screw portion 14b) and the unlocking process. Therefore, the required operating force can be made substantially uniform over the entire locking operation process by the locking means 12 and the entire unlocking operation process.

Next, a locking connector according to a second embodiment of the present invention will be described.
The lock type connector according to this embodiment is applied to the blood circuit (see FIG. 1) as in the first embodiment, and connects the tubes (6, 7) to the arterial blood circuit 1 or the venous blood circuit 2. As shown in FIGS. 13 to 15, the flow paths are mainly composed of a male connector 10, a female connector 14, a lock means 12, and an elastic member 15. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and those detailed description is abbreviate | omitted. Similarly to the first embodiment, the locking connector 8 for connecting the arterial blood circuit 1 and the tube 6 will be described in detail below in order to avoid duplication of explanation. However, the venous blood circuit 2 and the tube 7 are described in detail below. The lock-type connector 9 for connecting the two has the same configuration.

  The elastic member 15 is formed of a cylindrical member whose both end faces (15a, 15b) are flat, and the stepped portion of the connection insertion portion 11 is in a state where the connection insertion portion 11 is fitted to the fitting portion 14c. 10c and the opening edge surface 14ca of the fitting portion 14c (see FIG. 17), and the locking process by the locking means 12 (that is, screwing of the female screw portion 12a and the male screw portion 14b) In the process, it is possible to bulge in the radial direction (see FIG. 19). In other words, the elastic member 15 has an opening edge of the stepped portion 10c of the connection insertion portion 11 and the fitting portion 14c in a state in which the dimension u is connected to the male connector 10 and the female connector 14 (before locking by the locking means 12). The distance from the surface 14ca is substantially the same as that of the surface 14ca, and in the process of locking by the locking means 12, the dimension u is compressed in the direction of decreasing and is expanded in the radial direction.

  More specifically, in a state where the male connector 10 and the female connector 14 are connected (before locking by the locking means 12), both end faces (15a, 15b) of the elastic member 15 are the stepped portion 10c of the connection insertion portion 11. And the opening edge surface 14ca of the fitting portion 14c. The holding force is such that the elastic member 15 does not bulge in the radial direction. That is, the elastic member 15 is disposed so as to be adjacent to each other between the opening edge surface 14ca of the fitting portion 14c and the stepped portion 10c in a state where the connection insertion portion 11 is fitted to the fitting portion 14c. It is. When the locking means 12 is rotated while being moved in the axial direction, the male connector 10 and the female connector 14 are attracted to each other in the process of screwing the female screw portion 12a into the male screw portion 14b. Then, the elastic member 15 is compressed in the axial direction by the attracted force (compression by the compressive force indicated by reference signs F1 and F2 in FIG. 19).

  Thus, the elastic member 15 bulges in the radial direction (swelling in the direction indicated by reference numeral F3 in the drawing) along with the compressive force in the axial direction, and is elastic with respect to the female screw portion 12a of the lock means 12. It will contact | abut, producing a repulsive force. When the locking means 12 is slid toward the female connector 14 before the female screw portion 12a is screwed into the male screw portion 14b, the elastic member 15 and the female screw portion 12a are not in contact with each other. The locking means 12 may be brought into contact with the female connector 14 before the female screw portion 12a is screwed into the male screw portion 14b. When sliding, the elastic member 15 and the female screw portion 12a slightly contact each other, and the elastic member 15 bulges in the radial direction in the process of screwing the male screw portion 14b to the female screw portion 12a and more strongly contacts. It may be a thing.

  To connect and lock the male connector 10 and the female connector 14 using such a locking connector, first, as shown in FIGS. 16 and 17, the male connector 10 is connected to the fitting portion 14 c of the female connector 14. The insertion part 11 is inserted and fitted. At this time, both end surfaces (15a, 15b) of the elastic member 15 are sandwiched between the stepped portion 10c of the connection insertion portion 11 and the opening edge surface 14ca of the fitting portion 14c. On the other hand, a state where no axial compressive force is applied (a state where there is no bulging in the radial direction) is assumed.

  Then, when the female screw portion 12a is screwed into the male screw portion 14b by rotating the locking means 12 while moving in the axial direction (that is, moving forward to the tip side), as shown in FIGS. The connection state between the male connector 10 and the female connector 14 is locked. At this time, the elastic member 15 is given a compressive force in the axial direction as indicated by reference signs F1 and F2 in FIG. 19 and bulges in the radial direction as indicated by reference sign F3 in FIG. Thereby, a stronger repulsive force can be applied to the locking means 12.

  According to the second embodiment, as in the first embodiment, the connection insertion portion 11 has the locking means 12 in a state where the connection state between the male connector 10 and the female connector 14 is locked by the locking means 12. Since the elastic member 15 capable of contacting the inner peripheral surface (the female screw portion 12a) while generating a repulsive force by elasticity is provided, the connection state between the male connector 10 and the female connector 14 must be reliably maintained. In addition, it is possible to prevent liquid leakage. That is, both end surfaces (15a, 15b) of the elastic member 15 are in contact with the stepped portion 10c of the male connector and the opening edge surface 14ca of the female connector 14, respectively. Since it is in close contact and liquid tight, liquid leakage can be prevented.

  In particular, according to the present embodiment, the elastic member 15 is sandwiched between the connection insertion portion 11 and the fitting portion 14c in a state where the connection insertion portion 11 is fitted to the fitting portion 14c, and In the locked state by the locking means 12, it is possible to bulge in the radial direction, so that the connection state between the male connector 10 and the female connector 14 can be more firmly maintained in the locked state by the locking means 12, It is possible to reduce an operation force required for a lock operation by the lock unit 12 or a release operation of the lock (a screwing operation of the male screw portion 14b with respect to the female screw portion 12a or a screw releasing operation).

  According to the first embodiment and the second embodiment, the tube connected to the male connector 10 constitutes a blood circuit (arterial blood circuit 1 or venous blood circuit 2) for circulating the patient's blood extracorporeally. At the same time, the female connector 14 is connected to the tubes (6, 7) to which the puncture needles (a, b) that can be punctured by the patient are attached. Therefore, the connector (shunt connector) that connects the blood circuit and the puncture needle. Can be applied to. Further, it is possible to provide a blood circuit (arterial blood circuit 1 and venous blood circuit 2) that can reliably maintain the connection state between the male connector 10 and the female connector 14.

  Although the present embodiment has been described above, the present invention is not limited thereto. For example, the puncture needles a and b are formed on the female connector, and the female screw portion 12a and the screw of the locking means 12 are formed on the female connector. A male screw portion that can be combined is formed, and the present invention may be applied to the case where the puncture needles a and b are attached to the tip of the arterial blood circuit 1 or the venous blood circuit 2 without using the tubes 6 and 7. That is, the tube connected to the male connector 10 constitutes a blood circuit (arterial blood circuit 1 and venous blood circuit 2) for circulating the patient's blood extracorporeally, and the female connector can puncture the patient. The present invention can be applied to the puncture needle (a, b) or the one connected to the tube (6, 7) to which the puncture needle (a, b) is attached. In the present embodiment, as described above, the present invention is applied to a lock-type connector called a shunt connector for connecting a puncture needle to the tip of a blood circuit. However, in order to connect a liquid or gas flow path. The present invention may be applied to other types of lock-type connectors (not limited to medical use).

  An elastic member is provided at the connection insertion portion so that it can come into contact with the inner peripheral surface of the lock means while generating a repulsive force with the connection state between the male connector and the female connector locked by the lock means. As long as it is a lock-type connector, it can also be applied to ones with different external shapes or with other functions added.

1 Arterial blood circuit 2 Venous blood circuit 3 Dialyzer (blood purifier)
4 Blood pump 5 Air trap chamber 6, 7 Tube 8, 9 Lock type connector 10 Male connector 11 Connection insertion part 12 Locking means 12a Female thread part 13 Elastic member 14 Female connector 14b Male thread part 14c Fitting part 15 Elastic member

Claims (7)

A male connector in which a tube that can circulate liquid is connected to the base end, and a connection insertion part is formed at the tip, and
It has a fitting part that can be fitted by inserting the connection insertion part, and is connected to the male connector by fitting of the connection insertion part to the fitting part so that liquid can be circulated, and an outer peripheral surface A female connector with a male thread formed on the
A female screw portion that can be screwed to the male screw portion is formed on the inner peripheral surface of the male connector and the female connector between the male connector and the female connector by screwing the female screw portion to the male screw portion. Locking means for locking the connection state;
In the lock type connecting device comprising:
The connection insertion portion can be in contact with the inner peripheral surface of the lock means while generating a repulsive force with the connection state between the male connector and the female connector locked by the lock means. A lock-type connector, wherein an elastic member is provided.   2. The locking connector according to claim 1, wherein the elastic member is a ring-shaped member having elasticity.   3. The elastic member is formed of a ring-shaped member that is separate from the connection insertion portion, and can be fixed by being thermally adhered to the surface of the connection insertion portion by heating. Locking connector.   The elastic member is in a state of being sandwiched between the connection insertion portion and the fitting portion in a state in which the connection insertion portion is fitted to the fitting portion, and in the radial direction in the process of locking by the locking means The locking connector according to any one of claims 1 to 3, wherein the locking connector is capable of bulging.   In the male connector, a step portion is formed at a rear end portion of the connection insertion portion in order to prevent the locking means from coming off, and the elastic member is configured to fit the connection insertion portion into the fitting portion. 5. The locking connector according to claim 4, wherein in the state, the locking connection tool is disposed so as to be adjacent to each other between the opening edge surface of the fitting portion and the stepped portion.   The tube connected to the male connector constitutes a blood circuit for circulating the patient's blood extracorporeally, and the female connector is connected to a puncture needle that can be punctured by the patient or a tube to which the puncture needle is attached. The locking connector according to any one of claims 1 to 5, wherein:   A blood circuit comprising the locking connector according to any one of claims 1 to 6.

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