JP5283570B2 - Clamps, branch fittings, and blood circuits - Google Patents

Description

  The present invention relates to a clamp for sandwiching a flexible tube to block the flow of fluid at the site, a branch fitting having the clamp, and a blood circuit having the clamp.

  A blood circuit used for artificial dialysis treatment or the like includes a fluid pipe (for example, a flexible tube) that allows blood to flow inside as a fluid, and a branch pipe joint is connected in the middle of the fluid pipe. And the drug solution can be administered into the blood, blood transfusion or infusion can be performed through the branch pipe. In addition, a clamp is provided in the middle of the branch pipe, and the branch pipe is sandwiched and crushed by the clamp to stop the administration of drug solution, blood transfusion, and infusion.

  However, blood tends to stay between a portion of the branch pipe that is pinched by the clamp and the branch pipe joint, and the retained blood tends to coagulate to form a thrombus. Therefore, the connection port on the branch pipe portion side of the branch pipe joint faces the clamp, and the portion of the branch pipe that is pinched by the clamp is brought closer to the branch pipe joint side (see, for example, Patent Document 1 and Patent Document 2). Alternatively, the branch pipe is shut off using a three-way cock instead of the clamp (see, for example, Patent Document 3), so that the amount of blood retained in the branch pipe joint and the branch pipe, and thus the amount of thrombus formation, is reduced. It has been proposed to try to suppress.

Utility Model Registration No. 312020 Utility Model Registration No. 3123147 Japanese Patent No. 3718396

  By the way, in the structure of the clamp and branch pipe joint described in Patent Documents 1 and 2, the distance from the location where the clamp sandwiches the branch pipe to the branch base of the branch pipe joint is set sufficiently longer than the diameter of the branch pipe. Therefore, it is difficult to say that the amount of fluid retained in the branch pipe joint is reduced. Further, the three-way cock described in Patent Document 3 is not preferable because the structure becomes complicated and the manufacturing cost of a fluid supply system such as a blood circuit may increase.

  The present invention has been made in view of the above circumstances, and its purpose is to reduce the retention amount of the fluid even if the fluid stays at the position on the main piping side from the location where the branch piping is sandwiched and crushed. It is intended to provide a clamp, a branch fitting, and a blood circuit that can be used.

The present invention has been proposed in order to achieve the above object, and according to the first aspect of the present invention, there is provided an end portion on which a first convex portion is formed, and a second convex portion facing the first convex portion. The other end portion formed with a portion, the one end portion and an intermediate portion connected to the other end portion, and an engaging portion formed on the other end portion and engageable with the one end portion. When the first portion is bent and the one end portion is engaged with the engaging portion, the first convex portion and the second convex portion come close to each other, and the flexible tube is inserted between the first convex portion and the second convex portion. In a clamp that interrupts the flow of fluid at the clamping portion of the flexible tube,
The main pipe in which the main flow path of the fluid is formed among the flexible tubes is held between the first convex part, the second convex part, and the intermediate part,
From one end of the flexible tube to the opposite side of the intermediate part from the first convex part, or from the other side of the flexible pipe to the opposite side of the intermediate part from the second convex part. Established a branch insertion port through which a branch pipe branched into a T-shape is inserted.
The clamp is characterized in that the first convex portion and the second convex portion are configured to sandwich and squeeze a portion near the main pipe in the branch pipe.

  According to a second aspect of the present invention, the slit-shaped insertion opening is narrower than the diameter of the branch pipe from the side edge of the one end or the other end where the branch insertion port is opened to the branch insertion port. The clamp according to claim 1, wherein the clamp is opened with a width, and the branch pipe can be fitted to the branch insertion port through the insertion opening from the side of one end or the other end.

  According to a third aspect of the present invention, in the clamp according to the second aspect, a plurality of return protrusions are provided at the edge of the insertion opening in a state where the protruding end is positioned closer to the branch insertion opening. is there.

According to a fourth aspect of the present invention, a main pipe part having a pair of openings opened at both ends and a branch pipe part branched from the main pipe part into a T shape, at least the branch pipe part is formed of a flexible member. A branch pipe joint that allows fluid to flow in the main pipe part and the branch pipe part, and that can squeeze the branch pipe part with a clamp to block the flow of fluid in the branch pipe part,
The clamp has one end formed with a first convex portion, the other end formed with a second convex portion facing the first convex portion, and an intermediate portion connected to the one end portion and the other end portion. An engagement portion formed on the other end portion and engageable with the one end portion,
Holding the main pipe portion between the first convex portion, the second convex portion and the intermediate portion;
A branch insertion port is opened on the opposite side of the one end part from the intermediate part with the first convex part or on the opposite side of the second part of the other end part to the intermediate part. Insert the branch pipe part into the mouth,
When the intermediate portion is bent and one end portion is engaged with the engaging portion, the first convex portion and the second convex portion are close to each other, and the first convex portion and the second convex portion are the main pipe portions of the branch pipe portions. The branch pipe joint is characterized in that it is configured so as to cut off the flow of the fluid at the pinched portion of the branch pipe portion by pinching the side portion.

What is described in claim 5 is a blood circuit comprising a flexible tube through which blood flows as a fluid,
The flexible tube includes a main pipe having an artery-side puncture needle connected to one end and a vein-side puncture needle connected to the other end. A branch pipe joint is provided in the middle of the main pipe. Branch,
The branch pipe joint includes a main pipe part connecting main pipes at both ends, and a branch pipe part branching from the main pipe part into a T shape and connecting the branch pipes, and at least the branch pipe part is a flexible member. It is possible to block the flow of fluid in the branch pipe part by crushing the branch pipe part with a clamp.
The clamp has one end formed with a first convex portion, the other end formed with a second convex portion facing the first convex portion, and an intermediate portion connected to the one end portion and the other end portion. An engagement portion formed on the other end portion and engageable with the one end portion,
Holding the main pipe portion between the first convex portion, the second convex portion and the intermediate portion;
A branch insertion port is opened on the opposite side of the one end part from the intermediate part with the first convex part or on the opposite side of the second part of the other end part to the intermediate part. Insert the branch pipe part into the mouth,
When the intermediate portion is bent and one end portion is engaged with the engaging portion, the first convex portion and the second convex portion are close to each other, and the first convex portion and the second convex portion are the main pipe portions of the branch pipe portions. A blood circuit characterized in that it is configured so as to interrupt a fluid flow at a pinched portion of a branch pipe portion by pinching a close portion.

According to the present invention, the following excellent effects can be obtained.
That is, the clamp includes one end portion where the first protrusion portion is formed, the other end portion where the second protrusion portion facing the first protrusion portion is formed, the intermediate portion connected to the one end portion and the other end portion, and the like. An engaging portion formed on the end portion and engageable with the one end portion, holding the main pipe portion between the first convex portion, the second convex portion, and the intermediate portion, and the first convex portion among the one end portions. A branch insertion port is opened on the opposite side of the intermediate part from the middle part, or on the opposite side of the second convex part of the other end part, and the branch pipe part is inserted into the branch insertion hole. When the intermediate portion is bent and the one end portion is engaged with the engaging portion, the first convex portion and the second convex portion are close to each other, and the first convex portion and the second convex portion are the main pipe portions of the branch pipe portions. Since it is configured so as to cut off the portion closer to the fluid and block the flow of fluid at the pinched portion of the branch pipe portion, the main pipe side (within the branch pipe (branch pipe portion) than the clamp holding portion ( Even fluid staying in the position of the tube part side), it is possible to reduce the retention amount of the fluid. Therefore, when a clamp is used at the branch part of the flexible tube that constitutes the blood circuit, a thrombus is formed at the branch point due to the influence of stagnant blood or residual air, and the thrombus falls off from the branch point. Thus, the inconvenience of blocking the blood circuit at a location different from the branch location can be sufficiently suppressed. In addition, it is possible to reduce the amount of fluid retained in the branch pipe with a simple structure, and it is possible to suppress an increase in the manufacturing cost of the fluid supply system (blood circuit).

It is the schematic of a blood circuit. It is the schematic of a branch pipe joint. It is explanatory drawing of a clamp, (a) is a left view, (b) is a front view, (c) is a right view. (A) is explanatory drawing of the clamp provided with the insertion opening, (b) is explanatory drawing of the clamp which provided the return protrusion in the insertion opening.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
As shown in FIG. 1, a blood circuit 1 used for blood purification therapy by extracorporeal circulation such as an artificial dialysis treatment is a flexible tube (fluid piping) that causes blood or a chemical solution, which is a kind of fluid, to flow inside. 2, a main pipe (first path) 3 in which the fluid main flow path (specifically, a blood circulation flow path) is formed, and a branch pipe branched from the main pipe 3 ( (Second route) 4. In addition, an arterial puncture needle 6 is connected to one end of the main pipe 3, a venous puncture needle 7 is connected to the other end, and a pump abutting a blood pump 8 in the middle of the main pipe 3. A tube 9, drip chambers 10 and 11, and a blood purifier 12 are disposed. Furthermore, a branch pipe joint 14 is provided on the side closer to the artery side puncture needle 6 than the pump contact tube 9 (in other words, on the upstream side of the main pipe 3), and the branch pipe 4 extends from the branch pipe joint 14 to the main pipe portion 3. Branches in the direction to go. An infusion chamber 15 is provided in the middle of the branch pipe 4, an infusion container 16 is connected to the tip of the branch pipe 4, and physiological saline is supplied to the main pipe 3 through the branch pipe 4 during priming. In some cases, the blood can be injected or transfused while circulating in the main pipe 3.

Next, the branch pipe joint 14 will be described.
As shown in FIG. 2, the branch pipe joint 14 includes a main pipe portion 21 having a pair of openings opened at both ends, and a branch pipe portion branching from the main pipe portion 21 in a T-shape to the side and having an opening at the tip. 22 and a clamp (piping clamp) 23 mounted in a state in which the main pipe portion 21 and the branch pipe portion 22 are held inside, and the main pipe portion 21 and the branch pipe portion 22 are substantially orthogonal to each other. I am letting. Further, the main pipe 3 is connected to the opening of the main pipe portion 21 so that the main pipe portion 21 functions as a part of the main pipe 3, and the branch pipe 4 is connected to the opening of the branch pipe portion 22 to connect the branch pipe portion 22. Is made to function as a part of the branch pipe 4, and fluid such as blood and chemicals can flow into the main pipe portion 21 and the branch pipe portion 22. Furthermore, the branch pipe part 22 is formed of a flexible member (for example, vinyl chloride resin), and the branch pipe part 22 is sandwiched and crushed by the clamp 23 so that the fluid flow in the branch pipe part 22 can be blocked. Then, the pipe diameter of the main pipe section 21 is set larger than the pipe diameter of the branch pipe section 22 to form a stepped portion 24 between the main pipe section 21 and the branch pipe section 22, and the clamp 23 is provided on the stepped section 24. The part can be engaged.

  The clamp 23 is a member made of an elastically deformable material, for example, polypropylene. As shown in FIGS. 3A to 3C, the two clamps (e.g. The first holding part 26 (corresponding to one end part in the present invention), the second holding part 27 (corresponding to the other end part in the present invention), and the pipe holding space part 28 set between both the sandwiching parts 26, 27. And a connecting portion 29 (intermediate in the present invention) which is connected to the first holding portion 26 and the second holding portion 27 and connects one end in the longitudinal direction of each holding portion 26, 27 (left ends in FIG. 3B). And an engagement mechanism 30 that can engage the other ends in the longitudinal direction of the sandwiching portions 26 and 27 (the right ends in FIG. 3B). Specifically, the other end (right end) of the second sandwiching portion 27 is gently folded back toward the other end side (right end side) of the first sandwiching portion 26, and the first sandwiching portion of the folded portion (curved portion). An engagement portion (engagement claw) 30a that is a part of the engagement mechanism 30 is formed at the tip located on the 26th side, and a part of the engagement mechanism 30 is formed at the other end of the first clamping portion 26. An engaged piece 30b is formed. And the connection part 29 is bent, the 1st clamping part 26 and the 2nd clamping part 27 are closely approached, the to-be-engaged piece 30b (1st clamping part 26) is engaged with the engaging part 30a, and the 1st clamping part 26 and the other end of the second clamping part 27 can be engaged.

  Further, the first holding part 26 is provided with a first convex part 32 projecting toward the pipe holding space part 28 (inside the clamp 23), and the second holding part 27 is opposed to the first convex part 32. The 2nd convex part 33 is projected toward the piping holding space part 28 side (the inside of the clamp 23), and the front-end | tip of each convex part 32 and 33 goes to the level | step-difference part 24 of the branch pipe joint 14, and the diameter direction of the branch pipe part 22 Can be engaged in a state of crossing. Then, in a state where the first sandwiching portion 26 and the second sandwiching portion 27 are brought close to each other and the engaged piece 30b and the engaging portion 30a are engaged (a sandwiching state indicated by a two-dot chain line in FIG. 3B). The distance between the convex portions 32 and 33 is set to an interval narrower than twice the wall thickness of the branch pipe portion 22, and the engaged piece 30b is removed from the engaging portion 30a and the first clamping portion 26 and the first 2 In a state in which the holding portion 27 is separated (in an open state shown by a solid line in FIG. 3B), the distance between both the convex portions 32 and 33 is an interval sufficiently larger than the pipe diameter of the branch pipe portion 22, in other words. And the interval which can maintain the normal state which can let the branch pipe part 22 pass without being crushed is set.

  Further, in the pipe holding space 28, two positions communicating with each other with the pipe holding space 28 interposed therebetween are located closer to the connecting portion 29 than the protrusions 32 and 33 (leftward in FIG. 3B). In a direction crossing the main insertion port 34 with the longitudinal direction of the sandwiching portions 26, 27 (specifically, a direction orthogonal to the longitudinal direction of the sandwiching portions 26, 27 and a direction along the width direction of the sandwiching portions 26, 27). The main pipe portion 21 of the branch pipe joint 14 is passed through both the main insertion ports 34 to the pipe holding space 28 (specifically, the connecting portion 29 side of the pipe holding space 28). It is penetrated in a posture orthogonal to. Further, the folded portion located on the opposite side of the second holding portion 27 to the connecting portion 29 with the second convex portion 33 interposed therebetween (in other words, closer to the engaging portion 30a than the second convex portion 33), in other words, a pipe holding space. A branch insertion port 35 through which the branch pipe portion 22 can be inserted is opened at a folded portion that covers the engagement mechanism 30 side of the portion 28, and the branch pipe portion 22 is inserted into the branch insertion port 35 so that the pipe holding space portion 28 It is possible to extend outward (outside of the clamp 23). Then, the opening edge of the branch insertion port 35 restricts the branch pipe part 22 and further the branch pipe joint 14 from being separated from the second clamping part 27, and the second convex part 33 is moved to the step part 24 of the branch pipe joint 14. While always engaging, the main pipe part 21 is always fitted and held between the second convex part 33 and the connecting part 29.

  The clamp 23 having such a structure is attached to the branch pipe joint 14, the connecting portion 29 is bent, and the other ends of the both holding portions 26 and 27 are engaged by the engagement mechanism 30 (in other words, the first holding portion 26 is attached). When the clamp 23 is converted into the clamping state by engaging with the engaging portion 30a, the main pipe portion 21 is also fitted between the first convex portion 32 and the connecting portion 29, and the main pipe portion 21 is connected to the first convex portion. 32, the second convex portion 33, and the connecting portion 29. Furthermore, the first convex portion 32 and the second convex portion 33 are close to each other, and are sandwiched between the convex portions 32 and 33 so as to cross the branch pipe portion 22 to be a part of the flexible tube 2. The flow of the fluid inside, specifically, the flow of the infusion agent and blood for transfusion flowing down from the infusion container 16 is blocked at the pinching position of the branch tube portion 22 so that the infusion agent and the blood for transfusion become the main tube portion 21. As a result, it is prevented from flowing into the main pipe 3. At this time, the clamp 23 sandwiches the portion of the branch pipe portion 22 close to the main pipe portion 21 (closest) in a state where the main pipe portion 21 is included in the pipe holding space portion 28, so that the branch pipe 4 (branch pipe portion 22) Even if fluid such as blood (liquid) stays at a position closer to the main pipe 3 side (main pipe portion 21 side) than the clamping part 23 of the clamp 23, the remaining amount of the fluid is reduced to the portion corresponding to the main pipe portion. It can be reduced compared to conventional products that are not included. Therefore, when the clamp 23 is used at the branch portion of the flexible tube 2 constituting the blood circuit 1, there is a disadvantage that a thrombus is formed at the branch portion due to the influence of the staying blood, and further, the thrombus falls off from the branch portion. Thus, the inconvenience of blocking the blood circuit 1 at a location different from the branch location can be sufficiently suppressed. In addition, it is possible to reduce the amount of fluid retained in the branch pipe 4 with a simple structure, and to suppress an increase in the manufacturing cost of a fluid supply system (blood circuit 1) that allows fluid to flow stably. can do.

  Further, since the second convex portion 33 is always engaged with the stepped portion 24 of the branch pipe joint 14 and the main pipe portion 21 is always fitted between the second convex portion 33 and the connecting portion 29, the clamp 23 Even if it is an open state, the 2nd convex part 33 does not shift to the tip end of the branch pipe part 22 from the position near the main pipe part 21 which becomes the root of the branch pipe part 22. Therefore, the inconvenience that the clamp 23 inadvertently holds the distal end side of the branch pipe portion 22 can be prevented.

  By the way, in the said embodiment, the branch pipe part 22 is passed from the piping holding space part 28 side to the branch insertion port 35, and the main pipe part 21 is pushed in between the 2nd convex part 33 and the connection part 29 in this state, and piping Although it is necessary to hold (accommodate) the branch pipe joint 14 in the holding space 28, the present invention is not limited to this. For example, in the clamp 23 according to the second embodiment shown in FIG. 4A, a slit-like insertion opening 37 is opened from the side edge of the second holding portion 27 where the branch insertion port 35 is opened to the branch insertion port 35. The opening width of the insertion opening 37 is gradually reduced from the side edge of the second holding portion 27 toward the branch insertion opening 35 side. Furthermore, the width dimension on the branch insertion port 35 side is set to be narrower than the pipe diameter of the branch pipe part 22 and wider than twice the wall thickness dimension of the branch pipe part 22.

  In order to attach the clamp 23 having such an insertion opening 37 to the branch pipe joint 14, first, the clamp 23 is opened, and the main pipe portion 21 of the branch pipe joint 14 is engaged with the engaged piece 30b. It is inserted between the second protrusion 33 and the connecting portion 29 and inserted into the main insertion port 34. If the main pipe part 21 is held in the pipe holding space part 28, the branch pipe joint 14 is slid along the central axis of the main pipe part 21 or rotated around the central axis of the main pipe part 21 to branch. The tube portion 22 is positioned on the side of the second holding portion 27, specifically, on the insertion opening 37 side (left side in FIG. 4A) of the second holding portion 27 and faces the insertion opening 37. Then, the branch pipe part 22 is crushed along the opening width direction of the insertion opening 37, and in this state, the branch pipe joint 14 is slid along the central axis of the main pipe part 21, and the branch pipe part 22 is moved to the second clamping part 27. Is inserted into the branch opening 35 through the insertion opening 37 from the side. Therefore, the degree of freedom of the mounting procedure of the clamp 23 can be increased. Even if the branch pipe 4 is connected to the branch pipe portion 22 of the branch pipe joint 14 in advance, the clamp 23 can be easily attached. Further, the branch pipe portion 22 fitted into the branch insertion port 35 through the insertion opening 37 is restored to the original shape by the restoring force and does not return to the insertion opening 37. Therefore, it is possible to prevent the inconvenience that the branch pipe portion 22 is inadvertently detached from the clamp 23, and consequently the inconvenience that the clamp 23 is dropped from the branch pipe joint 14. For example, when the clamp 23 is removed from the branch pipe joint 14 when the blood circuit 1 is discarded, the branch pipe portion 22 is sufficiently crushed to the extent that it can pass through the insertion opening 37, and in this state, the insertion opening 37 is moved to the insertion opening 37. Pass it to the side of the clamp 23. If the branch pipe part 22 is removed to the side of the clamp 23, the main pipe part 21 is separated from the connecting part 29 and passed between the engaged piece 30b and the engaging part 30a and removed from the pipe holding space part 28.

  Further, as shown in FIG. 4B, a plurality of return protrusions 38 are provided in a sawtooth shape at the edge of the insertion opening 37 so that the protruding ends of the return protrusions 38 are located closer to the branch insertion opening 35. If set, even when the operation of passing the branch pipe portion 22 through the insertion opening 37 is temporarily suspended when the clamp 23 is attached to the branch pipe joint 14, the return protrusion 38 can hook the branch pipe portion 22. The tube portion 22 does not reverse the insertion opening 37 and come off the clamp 23.

  By the way, in the said embodiment, although the branch insertion port 35 and the insertion opening 37 were opened in the 2nd clamping part 27, this invention is not limited to this. For example, a portion of the first clamping part 26 that is located on the opposite side of the connecting part 29 with the first convex part 32 interposed therebetween (on the locked piece 30b side with respect to the first convex part 32) is on the second clamping part 27 side. It is also possible to open a branch insertion opening or insertion opening in the curved portion. Furthermore, although only the branch pipe portion 22 of the branch pipe joint 14 is formed of a flexible member, the present invention is not limited to this. In short, any structure is acceptable as long as at least the branch pipe portion 22 is formed of a flexible member and can be crushed by the clamp 23. For example, the main pipe portion 21 and the branch pipe portion 22 are formed of a flexible member. May be. Further, the main pipe portion 21 is formed in a straight shape and the branch pipe joint 14 is set in a T-shape. However, the present invention is not limited to this, and the main pipe part is bent or curved to change the branch pipe joint to Y. It may be set in a letter shape. Furthermore, in the said embodiment, although the clamp 23 was mounted | worn with the branch pipe coupling 14, this invention is not limited to this. For example, in a fluid pipe (for example, a fluid pipe in which a main pipe and a branch pipe are integrally formed) branched from a main pipe without using a branch pipe joint, the clamp 23 of the present invention is attached to the branch portion. You may wear it.

  Moreover, in the said embodiment, although the main pipe part (main piping) was hold | maintained with the 1st convex part 32, the 2nd convex part 33, and the connection part (intermediate part) 29, this invention is not limited to this. In short, the main pipe part (main pipe) may be held between the first convex part, the second convex part and the intermediate part. For example, side plates are provided on both sides of the clamp 23, and the side plate and the intermediate part are provided. The main pipe part (main pipe) may be held. The side plate may be a guide plate for guiding one end of the clamp to the engaging portion, a plate for positioning (for steadying) of the main pipe (main pipe), or a main pipe ( The board provided only with the function to hold | maintain (main piping) may be sufficient. Furthermore, the main pipe part (main pipe) may be bonded and fixed to the intermediate part.

  And in the said embodiment, although the branch pipe joint 14 with which the clamp 23 and this clamp 23 were mounted | worn was applied to the blood circuit 1, this invention is not limited to this. The point is that it has a fluid pipe that can flow a fluid such as gas or liquid inside, and the fluid pipe includes any main pipe and a branch pipe branched from the main pipe. You may apply to a fluid supply system.

DESCRIPTION OF SYMBOLS 1 Blood circuit 2 Flexible tube 3 Main piping 4 Branch piping 6 Arterial side puncture needle 7 Venous side puncture needle 8 Blood pump 9 Pump contact tube 10, 11 Drip chamber 12 Blood purifier 14 Branch pipe joint 15 Infusion chamber 16 Infusion fluid Container 21 Main pipe part 22 Branch pipe part 23 Clamp 24 Step part 26 First clamping part 27 Second clamping part 28 Pipe holding space part 29 Connecting part 30 Engaging mechanism 30a Engaging part 30b Engagement piece 32 First convex part 33 Second convex part 34 Main insertion port 35 Branch insertion port 37 Insertion opening 38 Return projection

Claims (5)

One end formed with the first convex portion, the other end formed with the second convex portion facing the first convex portion, the intermediate portion connected to the one end portion and the other end portion, and the other end An engaging portion that can be engaged with the one end portion, and when the intermediate portion is bent and the one end portion is engaged with the engaging portion, the first convex portion and the second convex portion are formed. In the clamp that closes and clamps the flexible tube inserted between the first convex portion and the second convex portion, and blocks the flow of fluid in the sandwiched portion of the flexible tube,
The main pipe in which the main flow path of the fluid is formed among the flexible tubes is held between the first convex part, the second convex part, and the intermediate part,
From one end of the flexible tube to the opposite side of the intermediate part from the first convex part, or from the other side of the flexible pipe to the opposite side of the intermediate part from the second convex part. Established a branch insertion port through which a branch pipe branched into a T-shape is inserted.
A clamp characterized in that the first convex portion and the second convex portion are configured to squeeze and crush a portion of the branch pipe close to the main pipe.   A slit-like insertion opening is opened with a width smaller than the diameter of the branch pipe from the side edge of the one end or the other end where the branch insertion opening is established to the branch insertion opening, and the branch pipe is connected to one end. The clamp according to claim 1, wherein the clamp can be fitted into the branch insertion port through the insertion opening from the side of the portion or the other end.   The clamp according to claim 2, wherein a plurality of return protrusions are provided at the edge of the insertion opening in a state where the protruding end is positioned closer to the branch insertion opening. A main pipe part having a pair of openings at both ends and a branch pipe part branched in a T-shape from the main pipe part, and at least the branch pipe part is formed of a flexible member, and fluid is contained in the main pipe part and the branch pipe part. A branch pipe joint that is capable of flowing, and is capable of blocking the flow of fluid in the branch pipe part by crushing the branch pipe part with a clamp,
The clamp has one end formed with a first convex portion, the other end formed with a second convex portion facing the first convex portion, and an intermediate portion connected to the one end portion and the other end portion. An engagement portion formed on the other end portion and engageable with the one end portion,
Holding the main pipe portion between the first convex portion, the second convex portion and the intermediate portion;
A branch insertion port is opened on the opposite side of the one end part from the intermediate part with the first convex part or on the opposite side of the second part of the other end part to the intermediate part. Insert the branch pipe part into the mouth,
When the intermediate portion is bent and one end portion is engaged with the engaging portion, the first convex portion and the second convex portion are close to each other, and the first convex portion and the second convex portion are the main pipe portions of the branch pipe portions. A branch pipe joint characterized in that it is configured so as to crush a close part and block a flow of fluid at a pinched part of the branch pipe part. A blood circuit comprising a flexible tube through which blood flows as a fluid,
The flexible tube includes a main pipe having an artery-side puncture needle connected to one end and a vein-side puncture needle connected to the other end. A branch pipe joint is provided in the middle of the main pipe. Branch,
The branch pipe joint includes a main pipe part connecting main pipes at both ends, and a branch pipe part branching from the main pipe part into a T shape and connecting the branch pipes, and at least the branch pipe part is a flexible member. It is possible to block the flow of fluid in the branch pipe part by crushing the branch pipe part with a clamp.
The clamp has one end formed with a first convex portion, the other end formed with a second convex portion facing the first convex portion, and an intermediate portion connected to the one end portion and the other end portion. An engagement portion formed on the other end portion and engageable with the one end portion,
Holding the main pipe portion between the first convex portion, the second convex portion and the intermediate portion;
A branch insertion port is opened on the opposite side of the one end part from the intermediate part with the first convex part or on the opposite side of the second part of the other end part to the intermediate part. Insert the branch pipe part into the mouth,
When the intermediate portion is bent and one end portion is engaged with the engaging portion, the first convex portion and the second convex portion are close to each other, and the first convex portion and the second convex portion are the main pipe portions of the branch pipe portions. A blood circuit characterized in that it is configured to squeeze a portion near the side and block a flow of fluid at a squeezed portion of the branch pipe portion.

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