JP2585875Y2 - Extracorporeal circulation circuit - Google Patents

Description

[Detailed description of the invention]

[0001]

INVENTION The present invention relates to relieve fluid pressure generated during feeding the circuit solution used during extracorporeal circulation of body fluid, and continuous ones the inflow of liquid into the air trap from intermittent ones The present invention relates to an extracorporeal circulation circuit that can reduce the generation of microbubbles by changing the value to.

[0002]

2. Description of the Related Art When liquid is supplied by a roller pump, pulsation is inevitable.
For example, when blood is circulated extracorporeally, a pulsating flow is generated in the current circuit, and the blood flowing into the air trap moves intermittently, so that microbubbles are drawn into the blood reservoir. This eventually contributes to the occurrence of blood coagulation. In other words, the microbubbles scattered in the blood activate contact factors (activator 11 and activator 12) in the blood, respectively (activator 11 and activator 12), resulting in the endogenous blood coagulation first phase. Will progress to the next stage. Eventually, blood coagulation results due to a very active person or composition. Therefore, the present inventors have conducted intensive studies to solve the above problems, and as a result, regardless of the strength of coagulation-related factors in blood, microbubbles considered as one coagulation factor so that blood does not coagulate Blood uptake was reduced.

[0003]

According to the present invention, an extracorporeal circuit having a main tube 2 and at least a rolling tube 3 and a drip chamber 4 in the middle of the main tube 2 is provided in the extracorporeal circuit downstream of the rolling tube 3. place the pressure buffer member 6 of the hydraulic occurring, before
The pressure buffer member 6 is constructed by disposing a flexible pressure buffer tube 11 communicating with the main tube 2 in a hard protective tube 13 and connecting these ends to a connection pipe 12. The pressure control line 1 is connected to the connection pipe 12 so that a sealed space formed between the buffer tube 11 and the protection tube 13 can communicate with the outside air.
4 provides extracorporeal circuit 1 equipped with.

[0004]

1 is a schematic view of an extracorporeal circuit 1 according to the present invention.
The extracorporeal circuit 1 includes a flexible synthetic resin main tube 2, a rolling tube 3 mounted in the middle of the main tube 2, a pressure buffer member 6, a drip chamber 4, and an end of the main tube 2. It is constituted by connectors 7 and 8 to be mounted. In the middle of the main tube 2, a constant pressure device 5 and co-injection parts 9, 10 are provided as needed. The constant pressure device 5 is provided to keep the pressure in the extracorporeal circuit 1 constant, and a known device comprising a flexible inner tube and a hard outer tube can be used.

FIG. 2 is an enlarged view of the pressure buffer member 6 of FIG.
The pressure buffering member 6 is a flexible pressure buffering tube 11 made of silicone or the like which has an excellent affinity for blood and does not easily form a thrombus.
Are arranged in a hard protective tube 13, and the ends of these tubes 11, 13 are connected and fixed to the connection tubes 12, 12. A sealed space is formed between the pressure buffer tube 11 and the protection tube 13, and a pressure control line 14 is attached to the connection tube 12 so that the space can communicate with the outside air. On the other hand, the space in the pressure buffer tube 11 communicates with the inside of the main tube 2 via the inside of the connection tube 12.

Next, an example of how to use the extracorporeal circuit 1 of the present invention will be described. The rolling tube 3 is squeezed with a roller pump (not shown), and the blood introduced into the main tube 2 from the connector 7 is passed through the pressure buffer member 6.
The liquid is sent into the constant pressure device 5 and the drip chamber 4.

When blood is introduced into the pressure buffer member 6,
Pressurized by the fluid pressure, the pressure buffer tube 11 expands,
The liquid pressure generated in the main tube 2 can be absorbed. The air pressure applied to the space between the pressure buffer tube 11 and the protection tube 13 can be kept low by appropriately discharging the air to the outside air through the pressure control line 14.

[0008] The liquid pressure generated in the main tube 2 can be kept low, and the pulsating flow of blood flowing in the main tube 2 can be reduced. Thereby, blood can be continuously fed into the drip chamber 4.

[0009]

Since the blood can be sent while the pulsation is kept small, the generation of microbubbles generated when the blood is sent into the drip chamber can be reduced. As a result, the frequency of occurrence of blood coagulation, which is a cause of trouble during extracorporeal circulation, can be reduced, and can be used for treatment with confidence.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of the extracorporeal circuit of the present invention.

FIG. 2 is an enlarged view of the pressure buffer member of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extracorporeal circuit 2 Main tube 3 Rolling tube 4 Drip chamber 5 Constant pressure device 6 Pressure buffer member 7 Connector 8 Connector 9 Mixed injection part 10 Mixed injection part 11 Pressure buffer tube 12 Connection pipe 13 Protection tube 14 Pressure control line

Claims (1)

(57) [Scope of request for utility model registration] 1. An extracorporeal circuit having at least a rolling tube 3 and a drip chamber 4 in the middle of the main tube 2 and the main tube 2. A pressure buffer member for hydraulic pressure generated in the extracorporeal circuit downstream of the rolling tube 3. 6 is arranged, the pressure buffering member 6 is the main
Flexible pressure buffer tube 11 communicating with in-tube 2
Are arranged in a hard protective tube 13 and these ends are connected to a connecting tube 12 , so that a closed space formed between the pressure buffer tube 11 and the protective tube 13 can communicate with the outside air. So that the connection pipe 12
An extracorporeal circuit 1 characterized in that a pressure control line 14 is attached to the body.