JP2573471Y2 - Check valve for transfer line of blood and chemicals - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-return valve disposed on a transfer line for transferring blood and chemicals used for collecting blood from a donor, instilling blood into a patient, or performing transfusion in an emergency.

[0002]

2. Description of the Related Art For example, when blood is collected from a donor (blood donor), a tube having a blood collection needle attached to the tip is connected to a blood collection bag, and the blood collection bag is positioned lower than the vein site of the donor to allow blood to be collected. It flows down naturally from above. Also, when performing infusion, the infusion container is hung on a stand. In addition, the autopheresis blood collection line is configured to add an anticoagulant to the blood collection line from the donor, and then send it to the centrifuge, to send the plasma component to the plasma bag and the blood cell component to the blood cell bag. .

[0003]

However, in the case of the conventional blood collection method as described above, the blood collection bag may be located at a position slightly higher than the vein site of the donor or at substantially the same level depending on the blood collection site. In such a case, although a blood collection bag having a suction blood collection (negative pressure blood collection) function is used, the blood that has flowed smoothly at the beginning of blood collection may flow backward as the pressure decreases. Also, in the case of intravenous drip, blood may flow back into the tube when the patient moves his or her body. Also in the blood collection line of autopheresis, blood may flow back to the anticoagulant line, or a collected component may flow back to the blood collection line. On the other hand, there is a check valve used in a hydraulic circuit or the like as a method of preventing backflow, and such a check valve is, for example, a poppet that can move in a cylinder in the case of an in-line type. It is necessary to provide a valve portion that can block the passage hole and the flow path, and the structure is complicated and expensive, and the device becomes large-sized, so that it is difficult to apply to a tube for blood collection or the like. On the other hand, for example, in Japanese Utility Model Laid-Open No. 58-120748
For the hollow body, an inlet opening is provided at one end.
The other end is connected directly or indirectly to an injection needle.
A mouth opening is provided, and an inlet opening side or an outlet is provided inside the main body.
Check valve provided on one or both of the open sides
Disclosed is an adapter for preventing reflux such as injection
I have. However, in this backflow prevention adapter,
Restricts the movement of the check valve ball inside the body
The structure is very complicated because it is necessary to provide regulating protrusions
And it takes time to manufacture
Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to easily prevent backflow of blood or drug solution at the time of blood collection or blood transfusion, and to be relatively simple and compact. It is an object of the present invention to provide a check valve for a transfer line for blood and chemicals, which can prevent backflow by a low-cost member having a structure.

[0005]

[Means for Solving the Problems] The blood and drug solutions of the present invention
The check valve for transfer line divides the tubes that constitute the flow path for blood and chemicals into an upstream side and a downstream side, and connects the upstream side tube and the downstream side tube with a communication pipe having tube ends inserted at both ends. A ball is movably provided in the communication tube, and the end surface of the upstream tube comes into contact with the ball.
Sheet surface that is closed by the
The end face of the tube can contact the ball against a part of it
And a part of the end face of the downstream tube
When the ball is in contact with the
Sheet having a channel opening communicating the flow side tube
It is characterized in that it is a surface. Downstream
The sheet surface at the end face of the side tube,
A V-shaped groove is continuous in the circumferential direction of the tube as described later.
To a cut shape.

[0006]

In the check valve according to the present invention , when blood or the like from the upstream tube flows into the communication tube, the ball moves downstream by the pressure and the ball moves to one side of the seat surface of the downstream tube.
And the ball contacts a part of the downstream tube.
Connect the communication tube and the downstream tube when they are in contact
Since the flow path port is formed , blood or the like freely flows downstream. When the pressure on the downstream side increases and blood or the like flows backward, the ball moves to the upstream side and abuts against the seat surface of the upstream tube, thereby closing the end opening of the upstream tube.
Backflow is prevented. Also, in order to form a check valve,
It is only necessary to machine the downstream tube end into a predetermined shape.
No. Therefore, complicated structures such as providing a projection in the communication pipe
Requires no fabrication, and requires very little time to manufacture
I can do it.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; FIG. 1 shows an example of a check valve 1 provided in a blood collection line, a drip line, a blood transfusion line, or the like. A transfer tube 2 made of transparent vinyl or the like is cut at an appropriate position, and an upstream tube 3 and a downstream tube are connected. The tubes 3 are divided into side tubes 4, and cut ends of the tubes 3 and 4 are connected by a communication tube 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 can insert the ends of the tubes 3 and 4 for a predetermined length. The inner diameter must be hard to pull out.

The inside of such a communication pipe 5 is made of SUS.
A ball 6 made of metal such as (stainless steel) or plastic such as PP (polypropylene) is inserted in advance. The diameter of the ball 6 is smaller than the inner diameter of the communication tube 5 so that the ball 6 can freely move in the communication tube 5 and can freely pass a fluid, that is, blood, a drug solution, or the like. The end surface of the upstream tube 3 in 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.
The end surface of the downstream tube 4 in the communication tube 5 is a seat surface 8 in which a V-shaped groove 9 is continuously cut in the tube circumferential direction, and even if the ball 6 contacts a part of the seat surface 8,
A flow path opening is formed between the other portion of the seat surface 8 and the ball 6 . Although the vertical cut is sufficient for the seat surface 7 on the closing side, the valve seat may be formed by chamfering the inner diameter portion of the upstream tube 3. In addition, the ball 6 can abut a part of the groove 9 of the seat surface 8 on the communication side.
When the ball 6 is in contact with a part of the gate surface 8
In this case, a channel opening is formed between the seat surface 8 and the ball 6.
Needless to say, any shape may be used as long as it is in a shape.

In the above-described configuration, when blood or chemical liquid from the upstream tube 3 flows into the communication tube 5, the ball 6 moves to the downstream side by the pressure, and hits the seat surface 8 of the downstream tube 4. However, since the groove 9 forms a flow path port, blood or the like flows out to the downstream tube 4 through the flow path port. When the pressure on the downstream side increases and the blood / chemical liquid flows backward, the ball 6 moves to the upstream side and abuts on the seat surface 7 of the upstream tube 3 to close the end opening of the upstream tube 3, thereby causing the backflow. Will be blocked. The pressure (flow rate) at which the closing by the ball 6 starts can be adjusted by a combination of the material and size of the ball and the material and size of the communication pipe.

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

(2) Autopheresis Blood Collection Line As shown in FIG. 3, the blood collection line is prepared by adding the anticoagulant from the anticoagulant bag 12 to the blood from the donor D by a roller type pump 13. The mixture is supplied to a centrifuge bowl 15 by a roller-type blood pump 14 to be centrifuged into a blood cell component such as a plasma component and a red blood cell, and the blood cell component is sent to a blood cell collection bag 16 by reversing the blood pump 14.
It is configured to send the plasma component to the plasma bag 17. In the anticoagulant line, if the set of rollers of the pump 13 is too sweet, blood may flow back to the anticoagulant bag 12 due to back pressure from the blood line side. Since the backflow may occur in the line, the check valve 1 according to the present invention is disposed upstream of the pump 13 in the anticoagulant solution line and in front of the blood cell collection bag 16 and the plasma bag 17, respectively. Thereby, it was possible to prevent the backflow of blood into the anticoagulant solution bag and the backflow of the collected component into the line.

(3) Emergency blood transfusion line FIG. 4 shows a blood transfusion line for rapidly transfusing a large amount of blood in an emergency, from a blood transfusion bag 20 to a bag needle 21 and a filtration device 2.
2. The blood is transfused through a manual pump chamber (soft cylinder) 23, a clamp 24, and a blood transfusion needle 25. In such a line, the check valve 1 of the present invention is provided at the outlet of the filtration device 22. Pump chamber 2
By grasping and releasing the hand 3, blood is pushed out intermittently, and at that time, backflow from the pump chamber 23 to the filtration device 22 is prevented by the backflow prevention valve 1, and a large amount and rapid blood transfusion is possible.

[0013]

Effects of the invention] As described above, the check valve of the present invention, the blood
The tubes constituting the flow path for liquids and chemicals are divided into an upstream side and a downstream side, and the upstream side tube and the downstream side tube are connected by a communication pipe having tube ends inserted at both ends, and a ball is placed in the communication pipe. Provided movably, the end face of the upstream tube,
The seat surface that is closed by the contact of the ball
And the end face of the downstream tube
Can be abutted, and part of the end face of the downstream tube
When the ball is in contact with the
A sheet surface on which a channel opening for communicating the tube is formed;
Since as is, the movement of the ball to the communicating tube
Since there is no need to provide a restricting projection or the like , backflow can be reliably prevented by a relatively simple and compact structure and at a low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a check valve according to the present invention.

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

FIG. 3 is a schematic view showing a blood collection line of 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]

 DESCRIPTION OF SYMBOLS 1 Check 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)

(57) [Scope of request for utility model registration] 1. A tube constituting a blood / medical fluid flow path is divided into an upstream side and a downstream side, and the upstream side tube and the downstream side tube are connected to each other by a communication tube having tube ends inserted at both ends. A ball is provided movably in the tube, and the end surface of the upstream tube is in contact with the ball.
And the downstream side tube
The end surface of the ball can contact the ball against a part of it.
And a part of the end face of the downstream tube.
When the ball is in contact, the communication pipe and the downstream side
A sheet surface on which a channel opening for communicating the tube is formed;
Transfer line blood, chemicals such you characterized in that it is
Use anti-reflux valve.