JP2000210381A - Extracorporeal circulation blood circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extracorporeal circulation blood circuit which eliminates the need for a pump to be exclusively used for a blood thickener while decreasing the amount of the blood to be used by reducing a packing rate and is capable of flexibly dealing with the case the blood thickener is not used. SOLUTION: This extracorporeal circulation blood circuit 1 which is composed of a blood reservoir 2, an artificial lung 3 for executing gas exchange with the blood, a reflux path 4 for refluxing part of the blood from the artificial lung 3 to the blood reservoir 2 and the blood thickener 5 interposed in the reflux path 4 is provided with a blood thickener holder 6 which supports the blood thickener 5 in the state that the blood inlet 5a of the blood thickener 5 is deposed in proximity to the reflux path side blood outlet 3a of the artificial lung 3 and that the blood outlet 5b of the blood thickener 5 is held in proximity to the reflux path side blood inlet 2a of the blood reservoir 2 in such a manner that the reflux path 4 is approximately linear to the flank of the blood reservoir 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extracorporeal blood circuit having an artificial lung for performing gas exchange of blood of a patient.

[0002]

2. Description of the Related Art In open heart surgery involving extracorporeal blood circulation, an extracorporeal circulation blood circuit 30 having an artificial lung is used to replace the cardiopulmonary function of a patient. As shown in FIG. 3, the extracorporeal circulation blood circuit 30 is connected to a blood reservoir 32 for temporarily storing blood removed from the vein of the patient 31 via a pump 33, and is connected to the blood reservoir 32 via a pump 33. An artificial lung 34 for performing gas exchange of blood sent from the patient 32 and sending blood again as arterial blood to the body of the patient 31
And a blood concentrator 36 for concentrating the blood which is returned through a return line 35 for returning a part of the blood gas exchanged by the artificial lung 34 to the blood reservoir 32.
And these are connected by tubes to exchange blood. The oxygenator 34 performs gas exchange of the blood of the patient 31 in place of the lungs of the patient 31, that is, removes carbon dioxide from the blood and supplies oxygen to the blood. Among the performed blood, those other than those returned to the blood reservoir 32 via the return path 35,
While the flow rate is monitored by 7, the blood is sent again as arterial blood into the patient 31. The blood concentrator 36 filters the blood of the patient 31 in the extracorporeal circulation blood circuit 30 in place of the kidney of the patient 31 and is diluted with a drug solution or the like added to the blood to use the extracorporeal circulation blood circuit 30. The blood is concentrated to an appropriate concentration, thereby reducing the burden on the kidneys of the patient 31 when the blood is returned to the body of the patient 31.

[0003]

The extracorporeal circulation blood circuit 30
Since the load on the patient 31 is large due to the nature of the circuit for removing the blood of the patient 31 from the body, the amount of blood to be removed from the patient 31, that is, the amount of the blood of the patient 31 used in the extracorporeal circulation blood circuit 30 is minimized. And patient 3
It is preferable to reduce the burden on the device (1). Therefore, the filling amount of blood into each member constituting the extracorporeal circulation blood circuit 30 is reduced, and the tube connecting these respective members is shortened to reduce the filling amount of the entire tube. It is desired to reduce the amount of blood used in the extracorporeal circulation blood circuit 30 without using a pump.

In order to solve such a problem, as disclosed in Japanese Patent Application Laid-Open No. Hei 6-245997, a tube for connecting a blood concentrator with a blood concentrator is built in an oxygenator. An extracorporeal blood circuit has been devised that reduces the amount of blood used in the tube and does not require a dedicated pump for the blood concentrator.In this case, the blood concentrator is built into the oxygenator. However, there is an inconvenience in that even if it is not necessary to use the blood concentrator depending on the condition of the patient or the contents of the operation, the excess equipment must be used without fail. The present invention has been made in view of the above circumstances, while reducing the amount of blood used by reducing the filling amount, while maintaining the need for a dedicated pump for the blood concentrator, when not using the blood concentrator It is another object of the present invention to provide an extracorporeal circulation blood circuit that can flexibly respond.

[0005]

According to a first aspect of the present invention, there is provided an extracorporeal circulating blood circuit, comprising: a blood reservoir for storing blood removed from a patient's body; and a blood reservoir connected to the blood reservoir via a pump. An artificial lung for performing gas exchange of blood sent from the blood reservoir and sending the blood again to the patient's body, and a return passage for returning a part of the blood whose gas has been exchanged by the artificial lung to the blood reservoir. In the extracorporeal circulation blood circuit constituted by a blood concentrator for concentrating the returned blood interposed between the blood concentrator and the artificial lung, the blood concentrator connects the blood inlet so that the return path becomes substantially linear. Supported by the blood concentrator holder with the blood outlet of the blood concentrator being close to the blood outlet of the blood return side and the blood outlet of the blood concentrator being close to the blood inlet of the blood reservoir of the blood reservoir. Characterized in that it is.

According to a second aspect of the present invention, in the extracorporeal circulation blood circuit, the blood concentrator holder is provided functionally integrally on a side of the blood reservoir.

According to a third aspect of the present invention, in the extracorporeal circulation blood circuit, the blood concentrator holder is attached to the blood reservoir or a holder for supporting an artificial lung. According to the extracorporeally circulating blood circuit configured in this way, the blood concentrator has its blood inlet brought into close proximity to the blood return side blood outlet of the oxygenator by the blood concentrator holder and connects the blood outlet of the blood concentrator to the blood reservoir. Since it is supported in a state of being close to the return path blood inlet, the return path is substantially straight, and a tube constituting the return path, that is, a tube used for connection between the oxygenator and the blood concentrator, and The tubes used for the connection between the blood concentrator and the blood reservoir can be shortened, the internal volume of the extracorporeal circuit is reduced, and a dedicated pump for the blood concentrator is not required. Further, the blood concentrator can be provided separately from the blood reservoir and the artificial lung, and the blood concentrator can be detached and used when unnecessary.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the extracorporeal blood circulation circuit according to the present invention will be described. As shown in FIG. 1, the extracorporeal circulation blood circuit 1 includes a substantially box-shaped blood reservoir 2 in which blood removed from the body of a patient is stored.
Pump (not shown) connected to the lower surface of blood reservoir 2
The artificial lung 3 performs gas exchange of the blood sent from the blood reservoir 2 and sends the blood to the patient again, and a part of the blood whose gas has been exchanged by the artificial lung 3 is returned to the blood reservoir 2. A blood concentrator 5 interposed in the return path 4 for concentrating the returned blood, and the side of the blood reservoir 2 is formed such that the return path 4 is substantially linear. A state in which the blood concentrator 5 has its blood inlet 5a approached to the return-side blood outlet 3a of the oxygenator 3 and the blood outlet 5b of the blood concentrator 5 has approached the return-side blood inlet 2a of the blood reservoir 2. The blood concentrator holder 6 is integrally formed. The pump used in the extracorporeal circulation blood circuit 1 is usually a highly safe centrifugal pump in which the pressure inside the circuit does not rise even if the tube through which the blood passes is bent, or a simple structure, and the blood has operating parts. A roller pump capable of sanitarily sending blood without direct contact is used.

On the upper surface of the blood reservoir 2, in addition to a connection port to which a tube connected to a vein of the patient and through which venous blood of the patient passes and a tube for transfusion, infusion, and infusion of a drug solution are connected, a return line is provided. The blood reservoir 2 is provided with a blood inlet 2a for connecting the blood concentrator 5, and a blood concentrator holder 6 for attaching the blood concentrator 5 is integrally formed on the side surface of the blood reservoir 2. Artificial lung 3 is blood reservoir 2
Is a part that performs gas exchange of blood pumped by the pump, and a part of the blood after gas exchange, in addition to the connection port 3b to which a tube that sends blood after gas exchange into the patient's body is connected. A return path side blood outlet 3a for connecting a return path 4 for returning to the blood reservoir 2 is provided. The oxygenator 3 is provided with a heat exchanger 3c for controlling blood taken into the extracorporeal circulation blood circuit 1 to an appropriate temperature.

The recirculation path 4 connects the recirculation path side blood outlet 3a of the oxygenator 3 and the recirculation path side blood inlet 2a of the blood reservoir 2 with a blood concentrator 5 interposed therebetween. The exchanged blood is concentrated by the blood concentrator 5 and returned to the blood reservoir 2. The blood concentrator 5 is a substantially cylindrical member having a built-in filter formed of a hollow fiber membrane or the like, and has a blood inlet connected to one end of the oxygenator 3 via a tube T with a return-side blood outlet 3a of the oxygenator 3. 5a is provided, and the other end is provided with a blood outlet 5b connected to the blood inlet 2a on the return path side of the blood reservoir 2 via the tube T. The blood concentrator 5 is connected to the return path 4
So that the blood inlet 5a is close to the return-side blood outlet 3a of the oxygenator 3 and the blood outlet 5b of the blood concentrator 5 is close to the return-side blood inlet 2a of the blood reservoir 2 so that the blood inlet 2a is substantially linear. In this state, it is supported by a blood concentrator holder 6 which is formed functionally integrally with the side surface of the blood reservoir 2. The blood concentrator 5 has a blood outlet 5c, and the blood outlet 5c is connected to a filtrate circuit 5d.
The filtrate circuit 5d is further connected to a filtrate tank 5e having an approximate scale of the filtrate amount.

The extracorporeal blood circuit 1 constructed as described above
The usage of is explained. First, the blood outlet 3a of the blood return path of the oxygenator 3 and the blood inlet 5a of the blood concentrator 5 constituting the blood return path 4, and the blood outlet 5b of the blood concentrator 5 and the blood inlet 2a of the blood reservoir 2 are connected. The blood concentrator 5 is attached to the blood concentrator holder 6 of the blood reservoir 2 such that the return path 4 is substantially linear with the tubes T connected. Subsequently, the vein of the patient and the blood reservoir 2 are connected, and the artificial lung 3 and the artery of the patient are connected by a blood supply circuit. Thereafter, the venous blood removed from the vein of the patient is stored in the blood reservoir 2. To store. Next, the blood in the blood reservoir 2 is introduced into the oxygenator 3 by the pump, and the blood temperature is controlled by the heat exchanger 3C in the oxygenator 3 while the oxygen gas is exchanged by the oxygenator 3.
Subsequently, the blood gas exchanged by the oxygenator 3 is sent to the patient by the pump and sent to the blood return and return channels 4. Then, the blood sent into the return path 4 is concentrated by the blood concentrator 5 arranged in the return path 4 and then returned to the blood reservoir 2. When the blood concentrator 5 is not required,
It is used with the filtrate circuit 5d closed or the tube T between the blood outlet 3a of the artificial lung 3 and the blood inlet 5a closed. The amount of the filtrate can be read by a rough scale attached to the filtrate tank 5e. In addition, the flow rate of blood sent to the patient can be determined by a flow meter 37 (see FIG. 3) attached to the blood feed line to the patient irrespective of the blood volume to the blood concentrator 5. This eliminates the need for a pump dedicated to the blood concentrator.

Extracorporeal circulation blood circuit 1 constructed as described above
According to the blood concentrator 5, the blood inlet 5a of the blood concentrator 5 is brought close to the blood outlet 3a of the artificial lung 3 and the blood outlet 5b of the blood concentrator 5 so that the return path 4 becomes substantially linear.
Is supported by a blood concentrator holder 6 which is formed integrally on the side surface of the blood reservoir 2 in a state of being close to the blood inlet 2a on the return path side of the blood reservoir 2 and is used for the return path 4. The length of the tube T can be shortened, thereby reducing the filling amount of the return path 4, reducing the amount of blood used in the extracorporeal circulation blood circuit 1, and reducing the burden on the patient. Can be. Also,
Since the blood concentrator 5 is provided separately from the blood reservoir 2 and the artificial lung 3, when the blood concentrator 5 is not used, the filtrate circuit 5 d is closed or the blood on the return side of the artificial lung 3 is not used. The tube T between the outlet 3a and the blood inlet 5a can be used in a closed state, and the number of devices to be used is reduced and the handling of the extracorporeal circulation blood circuit 1 is improved. Also, a pump dedicated to the blood concentrator is not required. In addition, since the blood concentrator 5 is not wasted, the cost involved in using it can be reduced. In addition, since the blood concentrator holder 6 is functionally provided integrally on the side of the blood reservoir 2, it is possible to eliminate the trouble of positioning the blood concentrator 5 when assembling the extracorporeal circulation blood circuit 1. .

In the above-described embodiment, the example in which the blood concentrator holder 6 is integrally formed functionally on the side of the blood reservoir 2 is used. However, the present invention is not limited to this.
As shown in (1), the blood concentrator holder 6a may be provided separately from the components of the extracorporeal circulation blood circuit 1 and attached to the blood reservoir holder 7 supporting the blood reservoir 2 via the stay 8. . Thereby, the blood concentrator holder 6 can be provided separately from the extracorporeal circulation blood circuit 1, which is basically disposable.
The body itself can be reused many times, and the cost of using the extracorporeal circulation blood circuit 1 can be reduced.

[0014]

According to the extracorporeal circulation blood circuit according to the first aspect of the present invention, the blood concentrator has its blood inlet brought into close proximity to the blood outlet of the artificial lung by the blood concentrator holder and the blood outlet of the blood concentrator. Is supported in a state of being close to the blood inlet of the blood reservoir, so that the blood return is substantially straight, and is used for connecting the tube constituting the blood return, that is, the connection between the oxygenator and the blood concentrator. Tubing, as well as the tubing used for the connection between the hemoconcentrator and the blood reservoir, can be shortened, thereby reducing the filling of the return channel and reducing the amount of blood used in the extracorporeal circuit. Thus, the burden on the patient can be reduced. In addition, since the blood concentrator is provided separately from these blood reservoirs and artificial lungs, the blood concentrator can be removed and used when it is not necessary, reducing the equipment used and reducing the extracorporeal circulation blood circuit. Handling is improved. Further, since the blood concentrator is not wastefully used, the cost for use can be reduced.
Further, the advantage that a pump dedicated to the blood concentrator is not required is maintained.

According to the second aspect of the present invention, since the blood concentrator holder is functionally integrally provided on the side of the blood reservoir, the blood concentrator is used when assembling the extracorporeal blood circuit. The time and effort required for the positioning can be saved.

In the extracorporeal circulation blood circuit according to the third aspect, the blood concentrator holder is formed separately from the extracorporeal circulation blood circuit which is basically disposable. Can be reused.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating the configuration and structure of an extracorporeal circulation blood circuit according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating the configuration and structure of another example of the extracorporeal circulation blood circuit according to the embodiment of the present invention.

FIG. 3 is a circuit diagram illustrating the configuration and structure of a conventional extracorporeal blood circuit.

[Explanation of symbols]

Reference Signs List 1 extracorporeal circulation blood circuit 2 blood reservoir 3 artificial lung 4 return line 5 blood concentrator 6 blood concentrator holder 7 blood reservoir holder 8 stay

Claims (3)

[Claims] 1. A blood reservoir, in which blood removed from the body of a patient is stored, and a gas connected to the blood reservoir via a pump and sent from the blood reservoir to exchange gas, thereby re-introducing the body of the patient. And a blood concentrator for concentrating the recirculated blood through a recirculation path for recirculating a portion of the blood gas exchanged by the oxygenator to the blood reservoir. In the extracorporeal circulation blood circuit constituted by, the blood concentrator has its blood inlet close to the blood return side blood outlet of the oxygenator, and the blood concentrator has An extracorporeal blood circuit, wherein the blood outlet is supported by a blood concentrator holder with the blood outlet close to the blood inlet of the blood reservoir. 2. The extracorporeal blood circuit according to claim 1, wherein the blood concentrator holder is functionally provided on a side of the blood reservoir. 3. The extracorporeal blood circuit according to claim 1, wherein the blood concentrator holder is attached to a holder that supports the blood reservoir or the artificial lung.