JPH07213601A - Artificial lung - Google Patents

Abstract

PURPOSE:To provide an artificial lung of a blood circuit built-in type which has a flow property and is capable of forming a small-volume blood circuit without requiring transfusion by simple means. CONSTITUTION:Many hollow fibers 1f for gas exchange are housed in a flexible tube 1a by aligning their longitudinal direction to the longitudinal direction of tube la. One end of these hollow fibers 1f is connected to a gas supply source and the tube 1a is interposed in a blood tube line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial lung for use in heart surgery and others.

[0002]

2. Description of the Related Art Conventionally, as an artificial lung used for extracorporeal circulation in a heart-lung machine, for example, a hard resin housing filled with hollow fibers for gas exchange has a relatively large internal volume. The lung C is arranged in an extracorporeal blood circuit A in which a blood pump B and a blood reservoir D are interposed as shown in FIG. In addition, E shows a patient.

[0003]

However, according to the above-mentioned conventional artificial lung C, since the housing is filled with the hollow fiber and the inside volume is relatively large, the blood filling amount of the whole blood circuit A is large. It becomes a problem, and therefore, extracorporeal circulation cannot be performed only by own blood, so blood transfusion is required, and when the transfused blood is contaminated with AIDS virus, the patient E may be fatally affected. It had some problems.

An object of the present invention is to solve the above problems and to provide a miniaturized artificial lung which is mobile by simple means and which does not require transfusion of incompatible blood mixed with AIDS virus or the like. .

[0005]

In order to achieve the above object, the present invention provides a flexible tube with a large number of hollow fibers for gas exchange, the longitudinal direction of which is aligned with the longitudinal direction of the tube. It is characterized in that one end of these hollow fibers is connected to a gas supply source and the tube is interposed in the blood duct.

[0006]

The blood flowing from one of the tubes is replaced with fresh blood in the tube by the oxygen gas flowing in the hollow fibers, and then the fresh blood flows out from the other of the tubes and circulates into the patient's body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes an artificial lung, which is a flexible tube 1a made of, for example, vinyl chloride, and bifurcated first to fourth branched tubes 1 provided on both sides of the tube 1a.
b, 1c, 1d, 1e, and a large number of hollow fibers 1f for gas exchange from the first branch pipe 1b through the tube 1a to the fourth branch pipe 1e.

Next, the use of the artificial lung 1 will be described with reference to FIG.

The artificial lung 1 is connected to the extracorporeal blood circuit A in which the blood pump B and the blood reservoir D are interposed in advance by the second branch pipe 1c and the third branch pipe 1d.

After the patient E is supine on a clinical bed or the like (not shown), the outflow / outflow end of the extracorporeal blood circuit A is connected to the patient E.

Then, the blood pump B is operated and
FIG. 2 illustrates oxygen for gas exchange in a direction opposite to the circulating blood flow from one first branch pipe 1b of the tube 1a of the artificial lung 1 previously incorporated in the extracorporeal blood circuit A to the other fourth branch pipe 1e. It is generated by an oxygen cylinder, which is a gas supply source not shown, and is fed under pressure into the hollow fibers 1f.

The blood flowing in from one of the third branch pipes 1d at the other end of the tube 1a is gas exchanged with oxygen sent back in the hollow fiber 1f to purify it, and becomes fresh blood. The other second branch pipe 1 at one end of the tube 1a
It flows out from c.

Thus, by circulating the fresh blood into the body of the patient E, the function as an artificial lung can be maintained.

FIG. 4 shows another embodiment of the present invention in which the other end of the tube 1a is formed into fifth, sixth and seventh trifurcated branch pipes 1g, 1h, 1i. Inside the tube 1a, from the fifth branch pipe 1g to the tube 1a
Is housed in a large number of hollow fibers 1f so as to be folded back at one end of the first branch pipe 1i and extend into the seventh branch pipe 1i.
Of the flow in the artificial lung without intentionally changing the flow of blood, because the structure is such that after flowing into one end of the, the flow is sent back again and out of the seventh branch pipe 1i. It prevents turbulence and is effective against problems such as thrombus formation, which has been a problem in the past.

Furthermore, it is possible to use a plurality of the artificial lungs 1 connected in series or in parallel according to the age and physique of the patient E.

[0017]

As described above, according to the present invention, a large number of hollow fibers for gas exchange are accommodated in a flexible tube, the longitudinal direction of which is the same as the longitudinal direction of the tube. Since one end of the fiber is connected to a gas supply source and the tube is arranged to intervene in the blood duct, by using the artificial lung having a relatively small volume and mobility, the harmful effects of blood transfusion are removed, This has the effect that the clinical position of the patient can be set relatively gently.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a schematic view showing a usage state of one embodiment of the present invention.

FIG. 4 is a partially cutaway front view of another embodiment of the present invention.

FIG. 5 is a schematic view showing a conventional use state.

[Explanation of symbols]

 1 Artificial lung 1a Tube 1b-1h 1st-7th branch 1f Hollow fiber

Claims (3)

[Claims] 1. A flexible tube containing a large number of hollow fibers for gas exchange, the longitudinal direction of which is aligned with the longitudinal direction of the tube, and one end of these hollow fibers is used as a gas supply source. An artificial lung, characterized in that the tube is connected and the tube is interposed in a blood duct. 2. Both ends of the tube are formed into a bifurcated branch pipe, and inside the tube, from one first branch pipe at one end thereof to the other fourth branch pipe at the other end of the tube. The hollow fiber that reaches to the inside of the third branch pipe at the other end of the tube and the other second branch pipe at the one end of the tube are formed in the blood passage. Artificial lungs. 3. The other end of the tube is provided with a trifurcated fifth member,
The hollow fibers formed in sixth and seventh branch pipes are accommodated in the tubes, the hollow fibers being folded from the fifth branch pipe at one end of the tubes and extending into the seventh branch pipes.
The artificial lung according to claim 1, wherein an opening formed in the branch pipe and at one end of the tube is formed in the blood passage.