JP4129870B2 - Joint for blood purification equipment - Google Patents

Description

  The present invention relates to a joint for a blood purification apparatus for connecting a tube end to a port in the blood purification apparatus.

  A dialyzer (blood purifier) used at the time of dialysis treatment has a blood flow path through which a patient's blood can flow and a dialysate flow path through which a dialysate can flow. A blood purification membrane (for example, a hollow fiber membrane) is interposed between the channel and the dialysate channel. The dialyzer housing is formed with a blood introduction port and a blood outlet port that communicate with the blood channel, and a dialysate introduction port and a dialysate outlet port that communicate with the dialysate channel.

  On the other hand, the blood circuit for extracorporeally circulating the patient's blood during dialysis treatment includes an arterial blood circuit having an arterial puncture needle formed at the tip, and a venous blood circuit having a venous puncture needle formed at the tip. The proximal ends of the arterial blood circuit and the venous blood circuit can be connected to the blood inlet port and blood outlet port of the dialyzer.

  The blood introduction port and the blood outlet port are, for example, those having a funnel shape having an outer diameter slightly larger than the inner diameter of the flexible tube constituting the arterial blood circuit and the venous blood circuit, as disclosed in Patent Document 1, for example. The flexible tube is inserted into these ports, and the dialyzer and the blood circuit can be connected by the frictional force.

  By the way, in the recent dialyzer, from the viewpoint of improving safety and the like, as shown in FIG. 8, the port 100 (blood introduction port or blood outlet port) of the dialyzer is made up of two cylindrical members (opening cylinder portion 101 and outer cylinder). Of the outer cylindrical portion 102 and a screw shape 102a formed on the inner peripheral surface of the outer cylindrical portion 102 is becoming mainstream. Note that only the open cylinder portion 101 communicates with the inside of the dialyzer, and the outer cylinder portion 102 does not communicate.

In order to connect the blood circuit to the dialyzer, as shown in the figure, a joint 103 in which a screw shape 103a that can be screwed with the screw shape 102a is formed on the outer peripheral wall is used. The proximal end of the main tube C constituting the arterial blood circuit or the venous blood circuit is firmly fixed by welding or the like. In order to connect the joint 103 to the port 100, the entire joint 103 is rotated while the opening cylinder portion 101 is inserted therein, and the screw shape 103a is screwed into the screw shape 102a.
Japanese Utility Model Publication No. 62-686

  However, the conventional joint for blood purification apparatus has the following problems because the base end of the main tube C constituting the blood circuit is fixed by welding or the like. That is, when the joint 103 is rotated to connect the blood circuit to the dialyzer and the screw shape 103a is screwed into the screw shape 102a, the main tube C is also rotated, and the main tube is also used during the subsequent treatment. There was a problem that the twist remained in C.

  If the main tube C remains twisted as described above, the operation of venting air during priming or the reversing operation of the dialyzer, blood collection from a rubber button formed in the middle of the main tube C, treatment such as drug administration, and blood collection There is a problem that the blood return operation becomes difficult to perform and the workability deteriorates.

  Further, when the main tube C is twisted, the bending causes blood drift in the main tube C, which may cause blood drift in the dialyzer. When such a drift in the dialyzer occurs, a blood stagnant portion is generated, resulting in a cause of blood coagulation or a residual blood phenomenon after a blood return operation.

  However, in the medical field, an operator should previously twist the joint in the reverse direction so that the main tube C is not twisted as described above, and perform an operation to eliminate the twist by screwing at the time of connection. However, even in such a case, there is a problem similar to the above in which the connection work is increased by one step and workability is deteriorated. Such a problem has occurred not only in the blood purifier, but also in the connection portion with the tube in other components constituting the blood purification apparatus.

  The present invention has been made in view of such circumstances, and it is possible to reliably connect the blood purification device, improve workability when connecting the tube to the blood purification device, and twist the tube. Therefore, an object of the present invention is to provide a joint for a blood purification apparatus that can suppress the occurrence of a drift of fluid in a tube.

According to the first aspect of the present invention, a tube end is formed with respect to a port formed of an open cylindrical portion communicating with the inside of the blood purification device and an outer cylindrical portion having a screw shape formed on an inner peripheral wall while projecting outside the open cylindrical portion. A blood purification device joint for connecting a portion, formed at the end of the tube, connectable to the open tube portion, rotatable relative to the tube, and An outer cylinder member that is movable in the extending direction and has an outer peripheral wall formed with a screw shape that can be screwed with the screw shape of the outer cylinder portion, and the outer cylinder member screwed with the outer cylinder portion The inner cylinder member is pressed against the opening cylinder part to be liquid-tight, and includes a stopper part that restricts movement of the inner cylinder member in the tube extending direction , and the inner cylinder member includes at least the tube It consists of a flexible tube with an outer diameter larger than the end. , In a state where the outer cylinder member is screwed to the outer tubular portion, wherein the stopper portion presses the step between the inner cylinder member and the tube end.

According to a second aspect of the present invention, in the blood purification device joint according to the first aspect, the blood purification device is a blood purification device to be connected to a main tube constituting a blood circuit .

According to a third aspect of the present invention, in the blood purification device joint according to the first or second aspect, a flexible tube having an outer diameter larger than at least the tube end is connected in the vicinity of the tube end. And a restricting portion for restricting the movement of the outer cylinder member with respect to the extending direction of the tube is formed at the step .

  According to the first aspect of the present invention, only the outer cylinder member is rotated while the inner cylinder member is pressed against the opening cylinder part by the stopper portion to make it liquid-tight, and the screw shape formed on the outer peripheral wall is changed to the outer cylinder. Since the joint can be connected to the port by being screwed into the screw shape formed on the inner peripheral wall of the part, the tube is not rotated when the joint is rotated, and the tube is not twisted.

Accordingly, various problems caused by the twisting of the tube can be avoided, and the joint blood purification device (including the blood purification device) can be securely connected, and the tube such as a blood circuit can be connected to the blood purification device. Workability can be improved. In addition, since no twist remains in the tube, it is possible to suppress the occurrence of drift of the fluid in the tube. Further, since the stopper portion can press the step between the inner cylinder member and the tube end portion and connect the inner cylinder member to the opening cylinder portion in a liquid-tight manner, a reliable connection can be made with a simple configuration. .

  According to the second aspect of the present invention, it is possible to reliably connect the joint to the blood purifier and improve workability when connecting the blood circuit to the blood purifier. In addition, since no twist remains in the main tube, it is possible to suppress the occurrence of blood drift in the main tube.

According to the invention of claim 3 , at least a flexible tube having an outer diameter larger than that of the tube end is connected to the vicinity of the tube end to form a step, and the step with respect to the extending direction of the tube is formed at this step. Since the restricting portion for restricting the movement of the outer cylinder member is formed, it is possible to avoid the outer cylinder member from largely moving from the end portion of the tube, and the workability can be further improved.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The joint for blood purification apparatus according to the present embodiment is for connecting the end portion of the main tube constituting the blood circuit to a blood introduction port and a blood outlet port formed in a dialyzer as a blood purification device. First, an example of the applied blood circuit and dialyzer will be described. In the present invention, it is assumed that the blood purifier constitutes a component of the blood purification device.

  The blood circuit to be applied is to circulate the patient's blood extracorporeally for artificial dialysis treatment, and to perform blood purification or the like in the middle, and as shown in FIG. 1, an arterial puncture needle 3 is connected to the tip. The arterial blood circuit 1 and the venous blood circuit 2 having a venous puncture needle 4 connected to the distal end thereof are mainly configured. The proximal ends of the arterial blood circuit 1 and the venous blood circuit 2 are respectively constructed. Is connected to a dialyzer 5 as a blood purifier.

  In the middle of the arterial blood circuit 1, a soft tube 6 having a diameter larger than that of the other part is connected, and a blood pump 7 for driving the soft tube 6 while squeezing is provided. Further, a drip chamber 8 for defoaming is connected in the middle of the venous blood circuit 2 so that air in the blood generated during the extracorporeal circulation process can be removed to return the blood to the patient's body. It is configured.

  Here, the arterial blood circuit 1 and the venous blood circuit 2 are composed of main tubes mainly composed of flexible tubes a to e, so that the patient's blood can be circulated extracorporeally through the main tubes. It has become. In addition, a T-shaped tube, a rubber button or the like (not shown) is connected in the middle of the main tube so that blood collection, drug administration, etc. can be performed while performing dialysis treatment.

  As shown in FIG. 2, the dialyzer 5 has blood introduction ports 9 and blood outlet ports 10 projecting from both end faces of a substantially cylindrical housing, and a dialysate inlet port 11 and a dialysate outlet port on the side surfaces. 12 is protrudingly formed. A plurality of hollow fiber membranes 13 (blood purification membranes) are disposed in the casing, and a blood flow in which the hollow fiber membranes 13 can communicate blood through the blood introduction port 9 and the blood outlet port 10. On the other hand, the space between the outer peripheral surface of the hollow fiber membrane 13 and the inner peripheral surface of the housing communicates with the dialysate introduction port 11 and the dialysate outlet port 12 from the dialyzer main body 14 (see FIG. 1). A dialysate flow path through which the supplied dialysate can flow is formed.

  Since the hollow fiber membrane 13 has a plurality of micropores, when blood passes through the blood flow path and dialysate passes through the dialysate flow path, the hollow fiber membrane 13 passes through the hollow fiber membrane 13 in the blood. An unnecessary material (waste product) is configured to be removed by dialysis to the dialysate side. In FIG. 1, reference numerals 15 and 16 denote couplers for connecting the dialysate flow lines L <b> 1 and L <b> 2 extending from the dialyzer main body 14 to the dialysate inlet port 11 and the dialysate outlet port 12.

  Here, the blood introduction port 9 and the blood outlet port 10 in the dialyzer 5 to which the present embodiment is applied are, as shown in the figure, an opening cylinder portion 18 communicating with the inside of the dialyzer 5, and the opening cylinder portion 18. The outer cylindrical portion 19 is formed with a screw shape 19a formed on the inner peripheral wall while projecting outside. That is, while the open cylinder portion 18 functions as a conventional open port, an outer cylinder portion 19 exclusively for screwing is formed on the outside thereof, and is configured to be screwed and connected to a joint 17 described later. .

  The opening cylinder part 18, the outer cylinder part 19, and the screw shape 19 a formed on the outer cylinder part 19 are integrally formed of resin, and the screw shape 19 a is formed on the inner peripheral wall of the outer cylinder part 19. It constitutes a female screw. In addition, the opening cylinder part 18 and the outer cylinder part 19 are formed concentrically in the cross section, and these constitute the blood introduction port 9 and the blood outlet port 10 together.

  On the other hand, as shown in FIGS. 3 and 4, an end tube ce or de having an outer diameter t1 is connected to the end of the flexible tube c or d, and constitutes the end of the main tube. ing. The outer diameter t1 of the end tube ce or de is set to be smaller than the outer diameter t2 of the flexible tube c or d and the outer diameter t3 of the inner cylinder member 20 described later. Steps D <b> 1 and D <b> 2 are generated between the tube c (d) and the inner cylinder member 20.

  The joint 17 is mainly composed of a substantially cylindrical outer cylinder member 21 inserted into the end tube ce or de, and an inner cylinder member 20 made of a flexible tube connected to the tip of the end tube ce or de. It is configured. Of these, the outer cylinder member 21 is movable and rotatable between the steps D1 and D2 (that is, in the state of FIG. 3, it is rotatable in the direction of the arrow m with respect to the end tube ce or de, and the arrow n Direction (movable in the extending direction of the end tube ce or de)).

  An opening 21c for inserting the end tube ce (de) is formed on the right end surface of the outer cylinder member 21 in the figure, and the diameter t4 is smaller than the outer diameter t2 of the flexible tube c (d). Is set. Thereby, it is possible to prevent the outer cylinder member 21 from moving beyond the step D <b> 1 and to avoid the outer cylinder member 21 from largely moving from the end portion of the main tube, thereby further improving workability. it can. This level | step difference D1 comprises the control part which controls the movement of the outer cylinder member 21. FIG.

  Further, the outer cylinder member 21 is formed with a screw shape 21a (male screw) that can be screwed with a screw shape 19a (see FIG. 2) on the outer peripheral wall thereof, and the base end side (the edge of the opening 21c). The stopper portion 21b is formed in the vicinity of the portion. Then, when the outer cylinder member 21 is rotated and the screw shape 21a is screwed to the screw shape 19a while the inner cylinder member 20 is in the state of being fitted and connected to the opening cylinder portion 18, as shown in FIG. Connection state.

  At this time, the stopper portion 21b presses the step D2 generated between the inner cylinder member 20 and the end tube ce or de, and applies a pressing force P in the left direction to the step D2. Yes. Such a pressing force P can make the connecting force of the inner cylinder member 20 to the opening cylinder portion 18 strong and liquid-tight, so that a reliable connection can be made with a simple configuration.

  Moreover, the movement with respect to the main tube extension direction of the inner cylinder member 20 can be controlled because the stopper part 21b is in a state of pressing the step D2. That is, in the screwed state shown in FIG. 5, the stopper portion 21 b presses the end surface of the inner cylinder member 20, so that the movement of the inner cylinder member 20 in the direction in which the inner cylinder member 20 is removed from the opening cylinder portion 18 is restricted. It also fulfills its function.

  In the above embodiment, the inner cylinder member 20 is fitted and connected to the opening cylinder portion 18, but as shown in FIG. 6, the end surface of the inner cylinder member 20 is in contact with the protruding end of the opening cylinder portion 18. The inner cylinder member 20 may be pressed by the stopper portion 21b to be liquid-tight. Further, as shown in FIG. 7, a taper is formed on the inner peripheral wall of the outer cylinder member 21, and this is used as a stopper portion 21'b, so that the stopper portion 21'b becomes a step D2 (that is, the inner cylinder member 20). ) May be pressed.

  Furthermore, in the present embodiment, a separate inner cylinder member 20 is connected to the tip of the end tube ce (de), but it may be formed by integrally molding these, and further, flexible. The distal end of the tube c (d) may be directly connected to or fitted to the opening cylinder portion 18 so that the connection portion is used as an inner cylinder member. However, in this case, it is necessary to form a convex portion to be brought into contact with the stopper portion in the vicinity of the tip of the flexible tube c (d).

  According to the above embodiment, when the inner cylinder member 20 is connected to the opening cylinder portion 18, when the outer cylinder member 19 is rotated and the screw shapes 21 a and 19 a are screwed together, the outer cylinder member 19 is Since it can be rotated and moved, the main tube end portion is not rotated and twisting is not caused. Accordingly, various problems caused by the twisting of the main tube (for example, an air bleeding operation during priming or an inversion operation of the dialyzer, processing such as blood collection from a rubber button formed in the middle of the main tube C, drug administration, and blood collection) Troubles that make it difficult to perform blood return operations, etc.), and ensure that the joint is connected to the blood purifier and improves the workability when connecting the blood circuit to the blood purifier. be able to.

  In addition, it is possible to suppress the occurrence of blood drift in the main tube C caused by the twist of the main tube C, and to avoid the retention of blood in the dialyzer. Thereby, since the production | generation of a retention part can be suppressed, blood coagulation, the residual blood after blood return operation, etc. can be avoided.

  Although the present embodiment has been described above, the present invention is not limited to this. For example, the dialysate introduction port 11 or the dialysate lead-out port 12 of the dialyzer 5 is connected to the opening cylinder and the outer cylinder as described above. If it consists, it can also be used as a coupling for connecting to the dialysate introduction port 11 and the dialysate outlet port 12. In this case, the couplers 15 and 16 are not necessary. The blood circuit to which the present joint is applied is a so-called double needle having puncture needles on the artery side and the vein side, respectively. The present invention can also be applied to a so-called single needle blood circuit connected to a venous blood circuit.

  The blood purification device applied to the joint for blood purification device of the present invention is not limited to the blood purification device, and may be another component constituting the blood purification device. For example, the present invention can also be applied to a connection portion with a monitoring device (corresponding to the dialysis device main body 14 of the present embodiment) such as a personal dialysis device that connects the tip of a tube (pressure monitor line or the like) extended from the drip chamber. It can also be applied to circuits for plasma exchange therapy or plasma purification therapy other than dialysis therapy. That is, the tube formed in the joint is not limited to the main tube, and the object to be connected to the tube is not limited to a blood purifier that purifies blood, but a purifying means that purifies plasma or the like (for example, used in plasma separation). Adsorption column etc.).

The schematic diagram which shows the blood circuit and dialyzer to which the coupling for blood purification apparatuses which concerns on embodiment of this invention is applied. The partial cross section schematic diagram which shows the dialyzer to which the coupling for blood purification apparatuses which concerns on embodiment of this invention is applied. The side view which shows the coupling for blood purification apparatuses which concerns on embodiment of this invention IV-IV line sectional view in FIG. The cross-sectional schematic diagram which shows the state in which the joint for blood purification apparatuses which concerns on embodiment of this invention was connected to the port of the dialyzer. Sectional schematic diagram showing a joint for blood purification apparatus according to another embodiment of the present invention. Sectional schematic diagram showing a joint for blood purification apparatus according to another embodiment of the present invention. Schematic diagram showing a conventional blood purification device joint and a dialyzer port to be connected thereto

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Arterial side blood circuit 2 ... Vein side blood circuit 3 ... Arterial side puncture needle 4 ... Vein side puncture needle 5 ... Dializer (blood purifier) (blood purification apparatus)
DESCRIPTION OF SYMBOLS 6 ... Soft tube 7 ... Blood pump 8 ... Drip chamber 9 ... Blood introduction port 10 ... Blood outlet port 11 ... Dialysate inlet port 12 ... Dialysate outlet port 13 ... Hollow fiber membrane 14 ... Dialyzer main body 15, 16 ... Coupler 17 ... Joint 18 ... Open cylinder 19 ... Outer cylinder 19a ... Screw shape 20 ... Inner cylinder member 21 ... Outer cylinder member 21a ... Screw shape 21b ... Stopper part D1 ... Step (regulator)
D2 ... Level difference ae ... Flexible tube (main tube)

Claims (3)

Blood purification for connecting a tube end to a port comprising an open tube portion communicating with the inside of the blood purification device and an outer tube portion formed on the inner peripheral wall while projecting outside the open tube portion. A coupling for a device,
An inner cylinder member formed at the tube end and connectable to the opening cylinder part;
An outer cylinder member that is rotatable with respect to the tube and that is movable in the extending direction thereof, and that has an outer peripheral wall formed with a screw shape that can be screwed with the screw shape of the outer cylinder portion;
In a state where the outer cylinder member is screwed into the outer cylinder part, the inner cylinder member is pressed against the opening cylinder part to be liquid-tight, and a stopper that restricts movement of the inner cylinder member in the tube extending direction. And
The inner cylinder member is formed of a flexible tube having an outer diameter larger than at least the tube end portion, and the stopper portion is the inner cylinder member in a state where the outer cylinder member is screwed to the outer cylinder portion. A joint for a blood purification device , wherein the step between the tube and the tube end is pressed .   The blood purification apparatus joint according to claim 1, wherein the blood purification apparatus is a blood purification apparatus to be connected to a main tube constituting a blood circuit. In the vicinity of the tube end, a flexible tube having an outer diameter larger than that of the tube end is connected to form a step, and the step restricts the movement of the outer cylinder member in the tube extending direction. claim 1 or claim 2 blood purification apparatus for joint wherein the regulating portion is formed.

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