JPH0524050U - Check valve for blood / chemical liquid transfer line - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure the prevention of backflow in a blood / medical solution collection / transfusion line with a simple and compact structure and inexpensive member. [Structure] A tube 2 that constitutes a flow path of blood / chemical liquid is divided into an upstream side and a downstream side, and an upstream tube 3 and a downstream tube 4 are connected by a communication pipe 5. Ball 6 in communication pipe 5
Is movably provided, and a seat surface 7 closed at the end of the upstream tube 3 by a ball, and a seat surface 8 at the end of the downstream tube 4 in which a flow path port is formed in a ball contact state.
To provide. Blood or the like freely flows from the upstream side to the downstream side by the flow path port of the seat surface 8, and backflow is prevented by the balls 6 and the seat surface 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a check valve provided in a transfer line for blood / medicine used for blood collection from a donor, drip infusion to a patient, or blood transfusion in an emergency.

[0002]

[Prior Art]

 For example, when collecting blood from a donor (donor), a tube with a blood collection needle attached to the tip is connected to a blood collection bag, and the blood collection bag is placed at a position lower than the venous site of the donor, and the blood flows downward from above. I try to run down naturally. Also, when instilling, the infusion container is hung on a stand. Furthermore, the blood collection line for autopheresis is configured to add anticoagulant to the blood collection line from a donor and then send it to a centrifuge to send plasma components to plasma bags and blood cell components to blood cell bags. ..

[0003]

[Problems to be solved by the device]

 However, in the case of the conventional blood collection method described above, the blood collection bag may be located at a position slightly higher than the venous site of the donor or at approximately the same level depending on the blood collection site. ) Although a blood collection bag with a function is used, there is a risk that blood, which had been flowing smoothly at the beginning of blood collection, will flow back as the pressure drops. Also, in the case of infusion, blood may flow back into the tube due to the patient moving the body. Also in the blood collection line of autopheresis, blood may flow back to the anticoagulant line or the collected components may flow back to the blood collection line. On the other hand, there is a check valve used in a hydraulic circuit, etc. as a method of preventing backflow, but such a check valve allows fluid to pass through a poppet that can move in the cylinder if it is an in-line type, for example. Since it is necessary to provide a valve portion that can close the fluid passage hole and the flow path, the structure is complicated and expensive, and the device becomes bulky, which makes it difficult to apply to blood collection tubes.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to easily prevent backflow of blood, drug solution, etc. at the time of blood collection, blood transfusion, etc. It is an object of the present invention to provide a backflow prevention valve for a blood / chemical liquid transfer line, which is capable of preventing backflow with a compact structure and an inexpensive member.

[0005]

[Means for Solving the Problems]

 The non-return valve of the present invention divides the tube that constitutes the flow path of blood and chemicals into the upstream side and the downstream side, and connects the upstream tube and the downstream tube with a communication tube with tube ends inserted at both ends. However, a ball is movably provided in this communication pipe, a seat surface such as a vertical cut closed by the ball is provided at the end of the upstream tube, and a flow path port is provided at the end of the downstream tube with the ball abutting. It is provided with a sheet surface such as a slanted cut for forming the.

[0006]

[Action]

 In the check valve, when blood etc. from the upstream tube flows into the communication tube, the ball moves to the downstream side due to the pressure and comes into contact with the seat surface of the downstream tube, but the downstream tube has a flow passage port. And blood etc. freely flows to the downstream side. When the pressure on the downstream side increases and blood or the like flows backward, the ball moves to the upstream side and contacts the seat surface of the upstream tube, and closes the end opening of the upstream tube to prevent the backward flow.

[0007]

【Example】

 Hereinafter, the present invention will be described with reference to an illustrated embodiment. Fig. 1 shows an example of a check valve 1 provided in a blood sampling line, a drip line, a blood transfusion line, etc., in which a transfer tube 2 made of transparent vinyl or the like is cut at an appropriate position, and the upstream tube 3 and the lower tube The flow-side tube 4 is divided, and the cut ends of the tubes 3 and 4 are connected by a communication pipe 5. The communication pipe 5 is made of a semi-soft polymer material such as PVC (polyvinyl chloride), urethane, EVA (ethylene / vinyl acetate copolymer), and the ends of the tubes 3 and 4 can be inserted to a predetermined length. Also, the inner diameter is such that it does not come off easily.

A ball 6 made of a metal such as SUS (stainless steel) or a plastic such as PP (polypropylene) is inserted in the communication pipe 5. The diameter of the ball 6 is smaller than the inner diameter of the communication pipe 5 so that the ball 6 can freely move in the communication pipe 5 and fluids, that is, blood, drug solution and the like can freely pass therethrough. The end surface of the upstream tube 3 inside the communication tube 5 is a vertically cut sheet surface 7 so that the ball 6 can close the end opening of the upstream tube 3. An end surface of the downstream side tube 4 in the communication pipe 5 is a seat surface 8 in which a V-shaped groove 9 is continuously cut in the tube circumferential direction so that a flow path port is formed even when the ball 6 abuts. To do. A vertical cut is sufficient for the seat surface 7 on the closing side, but the inner diameter portion of the upstream tube 3 may be chamfered to form a valve seat. It goes without saying that the groove 9 of the sheet surface 8 on the communication side may have any shape.

In the above configuration, when the blood / chemical solution from the upstream tube 3 flows into the communication tube 5, the ball 6 moves to the downstream side due to the pressure and the ball 6 moves to the sheet surface 8 of the downstream tube 4. Although abutting on each other, the groove 9 forms a channel opening, so that blood or the like flows out to the downstream side tube 4 through this channel opening. When the pressure on the downstream side rises and the blood / medicine solution flows backward, the ball 6 moves to the upstream side and comes into contact with the seat surface 7 of the upstream side tube 3, and the end opening of the upstream side tube 3 is closed. Be blocked. The pressure (flow rate) at which the ball 6 starts closing can be adjusted by a combination of the material and size of the ball and the material and size of the communicating pipe.

Next, a specific application using the check valve 1 will be described. (1) General blood collection line As shown in FIG. 2, a blood collection needle 10 for a donor D is attached to the tip of the blood collection tube 2, and a blood collection bag 11 having a suction blood collection function is connected to the rear end thereof. The check valve 1 of the present invention is provided in the middle of the blood collection tube 2. Even when the blood collection bag 11 was located higher than the vein blood collection site of the donor D, the backflow to the donor D could be prevented.

(2) Blood Collection Line for Autopheresis As shown in FIG. 3, this blood collection line adds anticoagulant solution from the anticoagulant solution bag 12 to the blood from the donor D by a roller pump 13. The mixed liquid is supplied to the centrifuge bowl 15 by the roller type blood pump 14 to centrifuge it into blood cell components such as plasma components and red blood cells, and the blood cell components are sent to the blood cell collection bag 16 by reversing the blood pump 14, It is configured to deliver the components to the plasma bag 17. In the anticoagulant line, there is a case where the roller of the pump 13 is not set properly and the back pressure from the blood line side causes the blood to flow back to the anticoagulant bag 12, and the blood is collected from the blood cell collection bag 16 and the plasma bag 17. Since the components may flow back into the line, the anti-reflux valve 1 of the present invention is provided upstream of the pump 13 of the anticoagulant line and in front of the blood cell collection bag 16 and plasma bag 17, respectively. As a result, it was possible to prevent the backflow of blood into the anticoagulant bag and the backflow of collected components into the line.

(3) Emergency Blood Transfusion Line FIG. 4 shows a blood transfusion line for rapid and rapid blood transfusion in an emergency. The blood transfusion bag 20 to the bag needle 21, the filtration device 22, and the manual pump chamber (soft cylinder). 23, the clamp 24 and the blood transfusion needle 25 are used for transfusion. In such a line, the check valve 1 of the present invention is provided at the outlet of the filtration device 22. Blood is intermittently pushed out by grasping or releasing the pump chamber 23 with a hand, and at this time, backflow from the pump chamber 23 to the filtering device 22 is prevented by the check valve 1, and a large amount of rapid blood transfusion is possible. Becomes

[0013]

[Effect of the device]

 As described above, in the transfer line of the present invention, a check valve for preventing backflow to the upstream side is provided in the middle of the tube that constitutes the flow path of blood / chemicals, or the soft tube for pump and the backflow are provided. Since the prevention valve is provided, it is possible to easily prevent the backflow of blood, drug solution, etc. during blood collection or blood transfusion. In addition, the check valve of the present invention divides the tube into an upstream side and a downstream side, and connects the upstream tube and the downstream tube with a communication pipe in which the tube ends are inserted at both ends. A ball is movably provided, and a seat surface that is closed by the ball is provided at the end of the upstream tube, and a seat surface that forms a flow path port in the ball contact state is provided at the end of the downstream tube. Therefore, the backflow can be reliably prevented with a relatively simple and compact structure and an inexpensive member.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a check valve of the present invention.

FIG. 2 is a schematic view showing a blood sampling line to which the present invention is applied.

FIG. 3 is a schematic view showing a blood sampling line for autopheresis to which the present invention is applied.

FIG. 4 is a schematic view showing an emergency blood transfusion line to which the present invention is applied.

[Explanation of symbols]

 1 Backflow Prevention Valve 2 Transfer Tube 3 Upstream Tube 4 Downstream Tube 5 Communication Tube 6 Ball 7 Seat Surface (Vertical Cut) 8 Seat Surface (Inclined Cut) 9 V-Shaped Groove

Claims (1)

[Scope of utility model registration request] 1. A tube constituting a flow path for blood / chemicals is divided into an upstream side and a downstream side, the upstream side tube and the downstream side tube are connected to each other by a communication tube into which tube ends are inserted, and this communication is performed. A ball is movably provided in the pipe, and a seat surface closed by the ball is provided at the end of the upstream tube.
A backflow prevention valve, characterized in that a seat surface is formed at the end of the downstream side tube in which a flow path port is formed in the state of contact with a ball.