JP4064898B2 - Fluid pipe connection device - Google Patents

Description

  The present invention relates to a connection device for a fluid line, for example, by connecting a blood circuit to a dialyzer and performing blood dialysis.

  Conventionally, for example, when blood dialysis is performed by connecting a blood circuit to a port of a dialyzer, connector members that connect tubes serving as blood circuits are connected to the inlet / outlet port of the dialyzer. However, if the fixing of the connector member is incomplete, an accident may occur in which blood in the blood circuit leaks due to the disconnection of the connector member. In order to prevent such an accident, the structure of the dialyzer and the connector member of the blood circuit has adopted the luer lock type system for more than ten years in Western countries. On the other hand, in Japan, the slip-in type with male-female fitting was adopted until around April last year, but the lure lock type structure was gradually adopted under the guidance of the Ministry of Health, Labor and Welfare, and now all are changed to the luer lock type. It was.

The structure of the luer lock type connecting device is such that a male screw is formed around the connector member on the blood circuit side, and a female screw is formed on the dialyzer head. They are connected by screwing them into screws.
JP-A-8-1555025 JP-A-11-253553

  The luer lock type connecting device is strong against pulling in the vertical direction, but has a disadvantage that it is relatively easily loosened once it is loosened counterclockwise. The cause is thought to be that the lead angle of the screw into which the blood port of the dialyzer and the connector member on the blood circuit side are screwed is relatively large, and contact is lost due to a slight rotation angle. For this reason, during dialysis, the connections must be carefully checked for looseness. Therefore, since the luer lock type connecting device is not completely safe, a safer connecting device is required.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a fluid pipe connecting device that does not unintentionally disconnect with a simple configuration.

  The present invention comprises a port which is a fluid inlet or outlet, a female screw formed to surround the flow path of the port, and a connector member having an opening connected to the port. An insertion tube portion to be inserted inside the lock tube, a lock nut attached to the insertion tube portion in a separate structure and opposed to the female screw of the port, and formed on an outer peripheral surface of the lock nut, A fluid line provided with a male screw that is screwed into a female screw, a connecting part that connects the insertion tube part and the lock nut and breaks and releases the connection when a certain force is applied. Connection device.

  The present invention is a fluid conduit connection device provided in a dialyzer for use in hemodialysis and comprising a port that is a blood inlet and outlet and a connector member having an opening connected to the port of the dialyzer. .

  Further, the connector member is provided with a handle portion for turning the connector member to screw the lock nut and the port, and the handle member is separated from the connector member when a certain force is applied. The connecting portion is provided.

  The port provided in the header section of the dialyzer is provided with a locking portion that is locked to a part of the connector member and prevents rotation in a direction in which the connector member and the port are unscrewed. Yes.

  The fluid conduit connection device according to the present invention has a simple structure and can reliably hold the connection of the fluid circuit. For example, the connection between the dialyzer and the connector member of the blood circuit is inadvertently released during artificial dialysis. Etc. can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show a first embodiment of the present invention, and the fluid conduit connection device of this embodiment is for a blood circuit connection device 10 of a dialyzer used for hemodialysis, A dialyzer 12 to be described later and a tube 14 as a blood circuit are connected to perform hemodialysis.

  The dialyzer 12 is made of a hard resin such as polycarbonate, and a header port 16 that is a blood injection port is provided at a header portion of one end of the dialyzer 12. A tubular portion 18 is formed in the header port 16, and a cylindrical outer tube portion 20 having the same projecting length concentrically outside the tubular portion 18 is provided. A female screw 24 is formed on the inner peripheral surface of the outer cylindrical portion 20.

  A connector member 26 is provided at the distal end portion 14a of the tube 14 that is a blood circuit. The connector member 26 has a cylindrical main body 28, and a cylindrical space penetrating the main body 28 extends from the middle of the main body 28 to the end portion 28 a on the tube 14 side, and the distal end portion 14 a of the tube 14 adheres to the inside. The remaining space communicating with the other end portion 28c is a large-diameter portion 28d into which the outer peripheral surface of the tubular portion 18 of the header port 16 is fitted with a slight clearance. ing. The portion of the main body 28 where the large-diameter portion 28d is provided is inserted into the groove portion 30 formed by the outer peripheral surface of the tubular portion 18 of the header port 16, the inner peripheral surface of the outer tube portion 20, and the bottom portion 22. A cylindrical portion 32 is formed. At the front end of the insertion tube portion 32, a flange portion 34 that contacts the bottom portion 22 of the header port 16 is provided around the outside.

  A plate-like handle portion 36 that protrudes outward in the diameter direction of the main body 28 and has a surface positioned in the insertion direction of the insertion cylindrical portion 32 is provided on the outer peripheral surface of the main body 28 other than the insertion cylindrical portion 32. A plurality of locking protrusions 38 embedded in a lock nut 40 described later are provided on the end 36 a of the handle portion 36 of the connector member 26 on the side of the insertion tube portion 32 so as to protrude in parallel with the insertion tube portion 32. ing. The lock projection 38 integrally connects the handle portion 36 and the lock nut 40 so as to be capable of being broken.

  A cylindrical lock nut 40 made of a material having high flexibility and good adhesion, such as silicon rubber, is provided on a portion of the outer peripheral surface of the insertion tube portion 32 located between the handle portion 36 and the flange portion 34. Is provided. On the outer peripheral surface of the lock nut 40, a male screw 42 that is screwed into the female screw 24 of the outer cylinder portion 20 of the header port 16 is formed. The lock nut 40 is attached after being molded separately from the main body 28. At this time, the lock projection 38 is bitten into the lock nut 36, and the lock nut 40, the handle portion 36, and the insertion tube portion 32 are connected. Link.

  On the opposite side of one header port 16 of the dialyzer 12, a header port (not shown) that is a blood outlet is provided in the same manner, and an identical connection device is provided.

  Next, an operation for attaching the connector member 26 to the header port 16 of the dialyzer 12 will be described. First, the insertion tube portion 32 of the connector member 26 to which the tube 14 is attached in advance in a watertight manner is inserted into the groove portion 30 of the header port 16 of the dialyzer 12. Next, holding the handle portion 36 of the connector member 26, the main body 28 is rotated clockwise with respect to the header port 16. Then, since the lock nut 40 attached to the insertion tube portion 32 is provided integrally with the insertion tube portion 32 by the locking projection 38, the lock nut 40 rotates integrally with the insertion tube portion 32, and the male of the lock nut 40. A screw 42 is screwed into the female screw 24 of the header port 16. Since the lock nut 40 of the connector member 26 is made of a flexible material, the lock nut 40 is closely connected to the header port 16 of the dialyzer 12 with high frictional force.

  When the connector member 26 is further rotated clockwise from this state, the locking projection 38 of the plug-in cylinder portion 32 is broken, and the lock nut 40 is in close contact with the female screw 24 in the outer cylinder portion 20 of the header port 16. The built-in cylinder part 32 becomes free. Also at this time, the lock nut 40 remains in close contact with the header port 16 to maintain water tightness.

  According to the fluid pipe connecting device 10 of this embodiment, even if a connector member 26 is screwed into the header port 16 of the dialyzer 12 and is securely connected, and a force is applied in a direction to release the screwing, Since the lock nut 40 remains in close contact with the outer cylinder portion 20, the blood circuit is not detached and is safe. Further, even if rotation is applied to the handle portion 36, only the main body 28 rotates and the lock nut 40 does not move, and there is no fear of liquid leakage or damage.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the fluid pipe connecting device 44 of this embodiment, the same members as those of the above embodiment are denoted by the same reference numerals, and description thereof is omitted. A perforated break line 46 is formed in the connector member 26 between the main body 28 and the handle portion 36.

  Next, an operation for attaching the connector member 26 to the header port 16 of the dialyzer 12 will be described. The insertion tube portion 32 of the connector member 26 to which the tube 14 is attached in advance is inserted into the groove portion 30 of the header port 16 of the dialyzer 12. Then, the main body 28 is rotated clockwise while holding the handle portion 36 of the connector member 26. Then, the lock nut 40 rotates integrally with the insertion tube portion 32, and the male screw 42 of the lock nut 40 is screwed into the female screw 24 of the header port 16. Accordingly, since the lock nut 0 of the connector member 26 is made of a flexible material, it is connected to the header port 16 of the dialyzer 12 in a watertight manner with a high frictional force.

  When the connector member 26 is further rotated clockwise from this state and a force of a certain level or more is applied to the handle portion 36, the lock nut 40 is brought into close contact with the header port 16, the main body 28 does not rotate, and a breaking line 46 is formed. The handle portion 36 is free from the main body 28 by being cut at the connected portion. The handle portion 36 separated from the main body 28 is not dropped by the locking means (not shown). The main body 28 and the lock nut 40 are kept in close contact with the header port 16 and are kept watertight.

  According to the fluid conduit connecting device 44 of this embodiment, the connector member 26 is screwed into the head port 16 of the dialyzer 12 and is securely connected with a simple structure. Even if a force is applied to the connector member 26 in the direction of releasing the screwing, the lock nut 40 is kept in close contact with the outer cylinder portion 20, so that the blood circuit is not detached and is safe. Even if rotation is applied to the handle portion 36 in the direction, since the handle portion 36 is separated, the main body 28 and the lock nut 40 do not move and there is no fear of breakage or the like.

  Next, a third embodiment of the present invention will be described with reference to FIG. In the fluid pipe connection device 48 of this embodiment, the same members as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted. In this embodiment, a protrusion 50, which is a locking portion that prevents the connector member 26 from rotating in the direction of releasing the screwing, is provided on the upper surface 20 a of the outer cylinder portion 20 of the header port 16 of the dialyzer 12 in the circumferential direction. It is formed continuously. The protrusion 50 has a sawtooth shape, the vertex 50a of the protrusion 50 is linearly provided in the radial direction of the outer cylinder portion 20, and the direction of the protrusion 50 moving in the clockwise direction from the vertex 50a is the outer cylinder portion 20. The right side surface 50b rises from the upper surface 20a at a substantially right angle, and the opposite side is an inclined surface 50c that approaches the upper surface 20a as the distance from the vertex 50a increases.

  Next, an operation for attaching the connector member 26 to the header port 16 of the dialyzer 12 will be described. The insertion tube portion 32 of the connector member 26 to which the tube 14 is attached in advance is inserted into the groove portion 30 of the header port 16 of the die analyzer 12. Then, the main body 28 is rotated clockwise while holding the handle portion 36 of the connector member 26. Then, the lock nut 40 attached to the insertion tube portion 32 rotates integrally with the insertion tube portion 32, and the male screw 42 of the lock nut 40 is screwed into the female screw 24 of the header port 16. At this time, the handle portion 36 approaches the vicinity of the outer cylinder portion 20 while rotating clockwise, and the end surface of the handle portion 36 is elastically deformed while being in contact with the inclined surface 50c of the protrusion 50 of the outer cylinder portion 20. When the rotation continues and the vertex 50a is overcome, the elastic deformation returns to its original shape, and the opposite right-angled surface 50b cannot be overcome from the opposite direction. Thereby, the rotation of the connector member 26 in the direction to release the screwing is stopped. The connector member 26 is connected to the header port 16 of the dialyzer 12 in a watertight manner with a high frictional force.

  According to the fluid pipe connecting device 48 of this embodiment, with a simple structure, the connector member 26 is screwed into the header port 16 of the dialyzer 12 to be securely connected, and a force is applied in a direction to release the screwing. Even if it is added, since the protrusion 50 and the handle portion 36 are locked, the connector member 26 is not detached, and the blood circuit is not detached, which is safe.

  The connection device of the present invention is not limited to the above embodiments, and the type and application of the fluid to be connected are not limited, and the shape, number, material, etc. of each member can be freely changed. It is. The strength at which the locking projection of the connector portion is broken, the strength of the break line from which the handle portion is separated, and the like can be appropriately set. Moreover, you may form the to-be-latched part which opposes the latching | locking part formed in an outer cylinder part and prevents the rotation of the direction which cancels | releases screwing in a connector member.

It is a partial fracture longitudinal cross-sectional view of the fluid pipe connection device of the first embodiment of the present invention. It is a partial fracture longitudinal cross-sectional view of the fluid pipe connection device of the second embodiment of the present invention. It is the side view (a), top view (b), and partial fracture longitudinal cross-sectional view (c) of the connection apparatus for fluid pipe lines of 3rd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fluid pipe | tube connection apparatus 12 Dializer 14 Tube 16 Header port 18 Tubular part 20 Outer cylinder part 22 Bottom part 24 Female screw 26 Connector member 28 Main body 30 Groove part 32 Insertion cylinder part 34 Flange part 36 Handle part 38 Locking protrusion 40 Lock Nut 42 male thread

Claims (3)

  A port that is a fluid inlet or outlet, a female screw that surrounds the flow path of the port, and a connector member that has an opening connected to the port, and is inserted into the female screw. An insertion tube portion, a lock nut attached to the insertion tube portion in a separate structure and opposed to the female screw of the port, and formed on the outer peripheral surface of the lock nut and screwed into the female screw of the port. A fluid pipe provided with a male screw to be joined, a connecting portion that connects the insertion tube portion and the lock nut and breaks and releases the mutual connection when a predetermined force is applied Road connection device.   The port is a port that is provided in a dialyzer used for hemodialysis and serves as a blood inlet and outlet, and the connector member is a connector member having an opening connected to the port of the dialyzer, and the connector The member is provided with a handle portion for rotating the connector member to screw the lock nut and the port, and the connector member and the handle portion are separated when a certain force is applied to the handle portion. The fluid pipe connection device according to claim 1, wherein the connecting portion is provided. The header portion of the dialyzer is provided with a locking portion that is locked to a part of the connector member and prevents rotation in a direction in which the connector member and the port are unscrewed. Item 3. The fluid pipe connection device according to Item 2.

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