JP6182579B2 - Locking connector - Google Patents

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. 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 is included, and a male connector is fitted to the female connector for connection, and a lock ring that locks a connection state between the male connector and the female connector.

  More specifically, the lock ring (locking means) is attached to the male connector, and a female screw portion that can be screwed with a male screw portion formed on the outer peripheral surface of the female connector is formed on the inner peripheral surface. The connection state between the male connector and the female connector is locked by screwing the female screw portion into the male screw portion. As a result, 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.

Utility Model Registration No. 3137386

  However, in the above-described conventional locking connector, an excessive load is applied, for example, the connected blood circuit is pulled in a state where the screwing of the female screw portion of the locking means and the male screw portion of the female connector is loosened. If applied, the connection between the male connector and the female connector may be disconnected. Therefore, the locking means and the male connector are respectively formed with a convex shape and a concave shape, and in the state where the female screw portion of the locking means is screwed into the male screw portion, the convex shape and the concave shape are fitted to prevent loosening. However, in this case, there is a possibility that the loosening prevention cannot be reliably performed due to the dimensional error of the convex shape and the concave shape.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a lock-type connector that can reliably prevent loosening of the screwing by the lock means.

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, either the lock means or the male connector is formed with a convex shape, and the other is pressed with the convex shape. It has a concave shape which is transferred by being stopped loosening the convex and concave shape fitted the locking means, and, the concave shape is characterized by being formed by plastic deformation.

According to a second aspect of the invention, the locking connector according to claim 1, characterized in that the concave shape is obtained by heating treatment.

According to a third aspect of the present invention, in the locking connector according to the first or second aspect , the convex shape or the concave shape is formed on a protrusion that prevents the locking means from coming out of the male connector. It is characterized by that.

In the invention according to claim 4, a tube capable of circulating a liquid is connected to the proximal end portion, and a male connector having a connection insertion portion formed at the distal end portion can be inserted into and fitted with the connection insertion portion. 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 manufacturing method of the lock type connecting device having the locking means for locking the connection state, either the locking means or the male connector forms a convex shape, and the other has the convex shape. Is transferred to a concave shape by causing pressure, it is prevented from loosening the convex and concave shape fitted the locking means, and, the concave shape is characterized by forming by plastic deformation.

According to a fifth aspect of the present invention, in the method for manufacturing a locking connector according to the fourth aspect, the concave shape is obtained by heat treatment.

According to a sixth aspect of the present invention, in the method of manufacturing a locking connector according to the fourth or fifth aspect , the convex shape or the concave shape is a protrusion that prevents the locking means from coming out of the male connector. It is formed in the part.

According to the first and fourth aspects of the present invention, either one of the locking means and the male connector has a convex shape, and the other has a concave shape transferred by pressing the convex shape. Since the convex shape and the concave shape are fitted and the locking means is prevented from loosening, the dimensional error of the convex shape and the concave shape can be extremely reduced, and the loosening of the screwing by the locking means can be surely prevented. Can do.

Furthermore , since the concave shape is formed by plastic deformation, the concave shape can be held even if the lock by the locking means is released, and repeated locking by the locking means can be performed more smoothly.

According to the second and fifth aspects of the present invention, since the concave shape is obtained by the heat treatment, for example, by passing through the sterilization process, the concave shape can be reliably ensured without going through a separate new process for heating. Can be formed.

According to the third and sixth aspects of the present invention, the convex shape or the concave shape is formed on the protruding portion that prevents the locking means from coming out of the male connector. The function as a part for stopping can also serve as the projection.

The schematic diagram which shows the blood circuit to which the lock-type connector which concerns on embodiment of this invention is applied. Perspective view of the locking connector according to implementation embodiments of the present invention (before connection) It is a figure which shows the male connector in the lock type connection tool, (a) Side view (b) Sectional drawing IV-IV sectional view in FIG. It is a figure which shows the locking means in the same, (a) Side view (b) Cross-sectional view before forming the concave shape (c) Cross-sectional view after forming the concave shape It is a figure which shows the female connector in the lock type connection tool, (a) Side view (b) Sectional drawing (A) Side view (b) Cross-sectional view showing the lock-type connector (the connected state of the male connector and the female connector and after being locked by the locking means) Side view showing the same locking connector (male connector and cap connected and locked by locking means) A locking means in locking connector according to the reference example (a) side view (b) cross-sectional view (A) Side view (b) Cross-sectional view showing a state in which the convex shape of the male connector is pressed against the elastic member of the locking means in the locking connector to form a concave shape. The side view which shows the male connector and the locking means in the lock-type connector which concerns on other embodiment of this invention. XII-XII sectional view in FIG. It is a figure which shows the convex shape of the male connector and the concave shape of a locking means in the lock-type connector which concerns on the other embodiment, Comprising: (a) Sectional drawing which shows a fitting state, Sectional drawing which shows the separated state (b) It is a figure which shows the convex shape of the male connector in the lock-type connector which concerns on another reference example , and the concave shape of a locking means, Comprising: (a) Sectional drawing which shows a fitting state, (b) Sectional drawing which shows the separated 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, and constitute a “medical liquid flow path” through which the patient's blood, priming liquid, 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.

Locking fitting according to implementation embodiments of the present invention (8,9) can not communicate with the flow paths by connecting the tube (6, 7) and the artery side blood circuit 1 or the venous blood circuit 2 As shown in FIGS. 2 to 6, it is mainly composed of a male connector 10, a female connector 14, a locking means 12, and a convex shape 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.

  As shown in FIGS. 2 and 3, the male connector 10 is connected to a tube (a flexible tube constituting the arterial blood circuit 1 in the present embodiment) that can circulate a liquid to the proximal end portion 10a. It consists of resin parts (for example, hard resin, such as PC (polycarbonate)) in which the connection insertion part 11 was formed in the front-end | tip part. The male connector 10 is preferably made of a material harder than the material of the locking means 12, and other engineering plastics such as PSU (polysulfone) that are not easily deformed by the application of stress for a long time or the heat of heat treatment. Can do. The male connector 10 has a through hole formed in the axial direction, and the through hole constitutes a flow path 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.

  Further, between the base end portion 10 a and the connection insertion portion 11, a shaft portion 10 b formed with a length of a predetermined dimension is formed along the axial direction of the male connector 10, and connected to the shaft portion 10 b. Between the insertion portion 11, a projection portion 10 c is formed that prevents (locks out) the locking means 12 from coming off the male connector 10. In addition, the base end part 10a, the shaft part 10b, the protruding part 10c, and the connection insertion part 11 are made of an integral resin part, and constitute the male connector 10 as a whole.

  As shown in FIGS. 2 and 6, 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 the fitting of the connection insertion portion 11 to the fitting portion 14c. Resin parts that are connected to the male connector 10 to allow the liquid to flow and have an external thread 14b formed on the outer peripheral surface (for example, a hard resin such as PC (polycarbonate) as with the male connector 10). It consists of The material of the female connector 14 is preferably the same material as that of the male connector 10, but other than PC, PP (polypropylene), high-density PE (polyethylene), thermoplastic elastomer, vinyl chloride, etc. Other resins that are difficult to deform can be used. A through hole is formed in the female connector 14 in the axial direction, and the through hole constitutes a flow path 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 FIGS. 2 and 5, the locking means 12 is made of a substantially cylindrical resin part (resin softer than the male connector 10 such as PP (polypropylene)), and slides with respect to the axial direction of the male connector 10. An interference portion 12c that can be freely attached and can interfere with the projection portion 10c formed on the male connector 10 is formed, and the projection portion 10c interferes with the interference portion 12c to prevent the locking means 12 from coming off. It has been. The material of the locking means 12 is preferably softer than the material of the male connector 10, and plastic deformation occurs due to the heat of heat treatment such as high density PE (polyethylene), thermoplastic elastomer, vinyl chloride, etc. in addition to PP. And the thing of the material which is not closely_contact | adhered with the male connector 10 is more preferable. Further, the locking means 12 is formed with a female screw portion 12a that can be screwed with the male screw portion 14b of the female connector 14 on the inner peripheral surface, and the female screw portion 12a is screwed into the male screw portion 14b. The connection state between the male connector 10 and the female connector 14 can be locked by rotating and screwing the male screw portion 14b and the female screw portion 12a.

  That is, after inserting and fitting the connection insertion portion 11 of the male connector 10 into the fitting portion 14c of the female connector 14, the lock means 12 is locked while moving to the distal end side (projection portion 10c side) of the male connector 10. By rotating the means 12 and screwing the male screw portion 12a to the female screw portion 14b (see FIG. 7), the male connector 10 and the female connector 14 are securely connected (connection insertion into the fitting portion 14c). In addition, the connection of the male connector 10 and the female connector 14 is locked.

  Here, as shown to FIGS. 2-4, the male connector 10 which concerns on this embodiment has the several convex shape 13 integrally formed over the circumferential direction in the projection part 10c. The convex shape 13 is formed of a rib extending in the axial direction while projecting in the radial direction of the male connector 10, and the female screw portion 12 a is screwed into the male screw portion 14 b to lock the connection between the male connector 10 and the female connector 14. In the process (see FIG. 7), the contact surface 12b (see FIG. 5B) of the locking means 12 is pressed to form a concave shape 12ba (see FIG. 7C) that is recessed in the radial direction. It is configured.

  That is, when the convex shape 13 of the male connector 10 is pressed against the contact surface 12b of the locking means 12, the contour shape of the convex shape 13 is transferred to the contact surface 12b and follows the outer contour of the convex shape 13. A concave shape 12ba is formed. Thus, as shown in FIG. 7, the convex shape 13 and the concave shape 12ba are fitted in the state where the female screw portion 12a is screwed into the male screw portion 14b and the connection between the male connector 10 and the female connector 14 is locked. In combination, the locking means 12 is prevented from loosening.

  Further, the concave shape 12ba according to the present embodiment is formed by the plastic deformation of the contact surface 12b of the locking means 12 that is pressed by the convex shape 13. Therefore, when the locking means 12 is rotated in the opposite direction from the locked state and the convex shape 13 and the concave shape 12ba are separated from each other, the concave shape 12ba remains (the shape is maintained). When repeatedly locking by the above, the convex shape 13 can be fitted into the concave shape 12ba in which the shape is held to prevent loosening.

  Further, in this embodiment, the concave shape 12ba is formed exclusively by the pressing force against the contact surface 12b of the convex shape 13, but the concave shape 12ba is formed by heat treatment in addition to the pressing force. preferable. For example, as the heat treatment, steam sterilization (for example, heating at 115 ° C. for 30 minutes, 121 ° C. for 20 minutes, or 126 ° C. for 15 minutes) before shipping the lock-type connector to a medical institution is preferable. Heat treatment other than sterilization (electron beam sterilization, EOG sterilization, etc.) or sterilization may be used.

  At the time of sterilization with heat treatment, as shown in FIG. 8, it is performed in a state where the cap 15 is put on the tip of the male connector 10. That is, when the cap 15 and the male connector 10 are locked by the locking means 12 with the cap 15 being put on, the convex shape 13 presses the contact surface 12b of the locking means 12, so that the pressing force and heating The contact surface 12b is plastically deformed by the heat accompanying the process, and the concave shape 12ba is transferred. Thus, since the concave shape 12ba is obtained by the heat treatment, the concave shape 12ba can be reliably formed without going through a separate new process for heating, for example, through a sterilization process. .

  However, in this embodiment, while the convex shape 13 is formed in the male connector 10, and the convex shape 13 is pressed and transferred to the locking means 12, the concave shape 12ba is formed. Then, a convex shape may be formed on the locking means 12 and the convex shape may be formed by pressing the convex shape onto the male connector 10 and transferring it. That is, it is sufficient that either one of the lock unit 12 or the male connector 10 has a convex shape and the other has a concave shape transferred by pressing the convex shape.

  Thus, according to the present embodiment, the convex shape 13 is formed on one of the locking means 12 and the male connector 10, and the concave transferred by pressing the convex shape 13 on the other. Since the convex shape 13ba and the concave shape 12ba are fitted and the locking means 12 is prevented from loosening, the dimensional error of the convex shape 13 and the concave shape 12ba can be extremely reduced. The loosening of the screwing due to can be surely prevented.

  In particular, since the concave shape 12ba according to the present embodiment is formed by plastic deformation, the concave shape 12ba can be held even if the lock by the lock means 12 is released, and the lock means 12 can be repeatedly locked. It can be performed smoothly. Further, since the convex shape 13 or the concave shape 12ba is formed on the protrusion 10c that prevents the locking means 12 from coming off from the male connector 10, it has a function of preventing the locking means 12 from coming off and preventing loosening. The portion 10c can also function as the part.

Next, a reference example will be described.
Locking fitting according to the present reference example, implementation similar to the form, intended to be applied to a blood circuit having an arterial blood circuit 1 and the venous blood circuit 2 shown in FIG. 1, for example, FIG. 2 6, the male connector 10, the female connector 14, the locking means 16, and the convex shape 13 are mainly configured. 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. Also, like reference numerals denote like elements and implementation form, a description thereof is omitted.

  As shown in FIG. 9, the lock means 16 is made of a substantially cylindrical resin part, is slidably attached to the axial direction of the male connector 10, and has a male screw portion of the female connector 14 on the inner peripheral surface. A female screw portion 16a that can be screwed with 14b is formed, and the female screw portion 16a is screwed into the male screw portion 14b (the locking means 16 is rotated to screw the male screw portion 14b and the female screw portion 16a). Thus, the connection state between the male connector 10 and the female connector 14 can be locked.

Here, in the locking means 16 according to this reference example , an elastic member 17 (soft material) is formed by two-color molding at a portion where the convex shape 13 abuts when locked. The elastic member 17 is made of an elastically deformable soft resin, rubber material, or the like, and in a state where the female screw portion 16a is screwed into the male screw portion 14b and the connection between the male connector 10 and the female connector 14 is locked. As shown in FIG. 10, when the convex shape 13 is pressed, the contour shape of the convex shape 13 is transferred to the elastic member 17, and a concave shape 17 a that follows the outer contour of the convex shape 13 is formed. . Thus, in a state where the female screw portion 16a is screwed into the male screw portion 14b and the connection between the male connector 10 and the female connector 14 is locked, the convex shape 13 and the concave shape 17a are fitted and the locking means 16 is engaged. It will be loosened.

Thus, the concave shape 17a according to the present reference example is formed by the elastic member 17 of the locking means 17 being pressed and elastically deformed by the convex shape 13. Therefore, when the locking means 16 is rotated in the opposite direction from the locked state and the convex shape 13 and the concave shape 17a are separated from each other, the original state is restored (the shape returns to the original state). At this time, each time locking is performed, the concave shape 16a is formed, and the convex shape 13 and the concave shape 16a can be fitted to prevent loosening.

However, in the present reference example , the convex shape 13 is formed on the male connector 10, and the concave shape 17a is formed by pressing and transferring the convex shape 13 to the elastic member 17 of the locking means 16. Instead, a convex shape is formed on the locking means 16 and the convex shape is pressed against the elastic member of the male connector 10 (for example, one formed by two-color molding as in the above embodiment is preferable). The concave shape may be formed by transferring. That is, it is sufficient that either one of the lock unit 16 or the male connector 10 has a convex shape and the other has a concave shape transferred by pressing the convex shape.

As described above, according to this reference example , the convex shape 13 is formed on one of the locking means 16 and the male connector 10, and the concave transferred by pressing the convex shape 13 on the other side. Since the convex shape 13 and the concave shape 17a are fitted and the locking means 16 is prevented from loosening, the dimensional error of the convex shape 13 and the concave shape 17a can be extremely reduced. The loosening of the screwing due to can be surely prevented.

In particular, since the concave shape 17a according to this reference example is formed by elastic deformation, the concave shape 17a is restored to its original shape when the lock by the lock means 16 is released. The convex shape 13 is newly transferred, and the concave shape 17a can be repeatedly formed. Moreover, since the site | part in which the concave shape 17a is formed consists of the elastic member 17, the concave shape 17a can be formed reliably and smoothly.

  Although the present embodiment has been described above, the present invention is not limited thereto. For example, as illustrated in FIGS. 11 and 12, the convex shape 18 formed on the male connector 10 is pivoted from the end surface of the protrusion 10 c. It is good also as a some rib extended in the axial direction of the part 10b. In this case, in the process in which the female screw portion 12a is screwed into the male screw portion 14b and the connection between the male connector 10 and the female connector 14 is locked, the convex shape 18 is pressed as shown in FIG. The concave shape α that is recessed in the axial direction can be formed. The concave shape α is formed by plastic deformation, and is held even when the lock by the lock means 12 is released, as shown in FIG. Thus, when the locking means 12 is locked, the convex shape 18 and the concave shape α are fitted and the locking means 12 is prevented from loosening, so that the dimensional error of the convex shape 18 and the concave shape α can be extremely reduced. The loosening of the screwing by the lock means 12 can be reliably prevented.

Furthermore, as another reference example, as shown in FIG. 14, in the locking means 12, an elastic member 19 (the same material as the elastic member 17 in the reference example ) is formed in two colors at a portion where the convex shape 18 abuts when locked. It is good also as what was formed in. In this case, in the process in which the female screw portion 12a is screwed into the male screw portion 14b and the connection between the male connector 10 and the female connector 14 is locked, as shown in FIG. A concave shape β recessed in the axial direction can be formed by being pressed by 19 and transferred. The concave shape β is formed by elastic deformation, and as shown in FIG. 14B, when the lock by the locking means 12 is released, the original shape is restored. Thus, when the locking means 12 is locked, the convex shape 18 and the concave shape β are fitted and the locking means 12 is prevented from loosening, so that the dimensional error of the convex shape 18 and the concave shape β can be extremely reduced. The loosening of the screwing by the lock means 12 can be reliably prevented.

  In this 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, but 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).

The locking connector of the present invention has a convex shape formed on one of the locking means or the male connector, and the other has a concave shape transferred by pressing the convex shape, As long as the convex shape and concave shape are fitted to prevent the locking means from loosening , and the concave shape is formed by plastic deformation, it has a different appearance shape or has other functions added. There may be.

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 12ba Concave shape 13 Convex shape 14 Female connector 14b Male thread part 14c Fitting part 15 Cap 16 Locking means 17 Elastic member 17a Concave shape 18 Convex shape α, β Concave shape

Claims (6)

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:
Either one of the locking means or the male connector has a convex shape, and the other has a concave shape transferred by pressing the convex shape, and the convex shape and the concave shape are fitted. In addition, the locking means is prevented from loosening , and the concave shape is formed by plastic deformation . Locking connector according to claim 1, characterized in that said concave shape is obtained by heating treatment. The lock-type connector according to claim 1 or 2, wherein the convex shape or the concave shape is formed on a protruding portion that prevents the locking means from coming off the male connector. 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 manufacturing method of the lock type connecting device comprising:
Either the locking means or the male connector is formed with a convex shape, and the concave shape is transferred to the other by pressing the convex shape, and the convex shape and the concave shape are fitted and the lock A method of manufacturing a lock-type connector, characterized in that the means is prevented from loosening and the concave shape is formed by plastic deformation . The method for manufacturing a locking connector according to claim 4 , wherein the concave shape is obtained by heat treatment. 6. The method of manufacturing a lock-type connector according to claim 4, wherein the convex shape or the concave shape is formed on a protrusion that prevents the locking means from coming off the male connector. .

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