JPS6021740B2 - Auxiliary circulation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a highly practical auxiliary circulation device that increases the effect of auxiliary circulation on a heart with impaired function.

A pulsatile blood pump is sometimes used to support a heart that is failing.

For example, when performing left heart assistance, a blood pump is used to bypass the left atrium and the aorta. However, when such circulatory support is performed, blood entering the left fan from the lungs flows into both the natural heart and the blood pump, and is pumped out to the aorta via both. At this time, depending on the degree of deterioration in the function of the myocardium of the natural heart, the aortic pressure waveform may become undulated due to the pumping of both the natural heart and the blood pump, leading to the following problem. Firstly, the ratio of the amount of blood flowing from the left atrium to the natural axilla and the blood pump is not constant and changes from time to time, so the arterial pressure is not stable. Second, when the natural visceral function recovers, an ejection pressure pulse wave occurs, similar to when the heart rate increases. In other words, it becomes as if there are two hearts, and as a result, the volume of blood ejected per unit time increases, and the automatic adjustment of the peripheral circulatory system causes a decrease in peripheral circulatory resistance, which lowers the diastolic pressure of the arterial pressure. It has the disadvantage of causing a decrease in Third, when the natural heart recovers, blood in the left atrium naturally tends to flow into the ventricle of the natural heart, so the amount of blood that enters the blood pump decreases, making it difficult for the blood pump to ensure antithrombotic properties. In other words, the specifications required for blood pumps are becoming stricter. Fourth, if we reduce the workload of the natural mind through auxiliary circulation and hope for its recovery, there is an empirical problem in that if the natural mind is completely rested, recovery will be extremely difficult. Therefore, even if the function of the natural mind is impaired, it is better to allow the child to do some work. Naturally, if the blood from the left screen flows into the ventricle with decreased function more easily than the blood pump, the blood that is not ejected into the ventricle tends to remain, and as a result, ○
A disadvantage arises in that the volume of the chamber remains large during auxiliary circulation. The present invention was made in consideration of these circumstances, and its purpose is to effectively assist the auxiliary circulation when performing auxiliary circulation using a blood pump, and to effectively restore the natural mind. The objective is to provide an auxiliary circulation device that can promote

That is, the present invention relates to a balloon device used in conjunction with a blood pump, which is inserted into the ventricle of the natural heart and expands and deflates in synchronization with an electrocardiogram to assist its function. It is. Therefore, from the point of view of the blood pump, natural zero is moving, but if it is stopped, it will be in the same condition, and this will allow it to fully demonstrate its function, and it will also be easier for the natural mind to recover. It becomes painful. Embodiments of the present invention will be described below with reference to the drawings.

Figures 1a and 1b are diagrams showing the general structure of the balloon device, and 1 is a catheter made of a flexible tube.

The end of this catheter 1 is closed, and a plurality of holes 2 are bored in the circumferential surface of the distal end thereof. Therefore, the distal end of this catheter 1 is made of silicone, which is a biocompatible material.
A flexible balloon 3 made of natural rubber, polyurethane, absosane, etc. is provided in the form of a bag, and the inside thereof is inserted only into the inside of the catheter 1 through the hole 2. The outer shape of the balloon 3 when inflated is cylindrical, or when used for the left ventricle, the cross section is circular. The lever balloon 3 is inflated by compressed air supplied via the catheter 1 from a drive device to be described later, and is also deflated by negative pressure as shown by the double-dot line in the figure. However, the balloon device having such a structure is shown schematically as indicated by the hatched symbol 4 in FIG.

This balloon device 4 is inserted into the ventricle through the apex of the heart 5 or the valve on the aortic side. Here, an example is shown in which the balloon device 4 is inserted into the right ventricle from the apex of the heart, and the balloon device 4 is inserted into the left D ventricle from the artery side via the valve.
A blood pump 6 is provided between the left fan of the heart 5 and the aorta, bypassing the left ventricle. The electrocardiogram of the heart 5 is detected by a cardiac fin monitor 7.

A balloon drive device 8 drives the balloon device 4 and a blood pump drive device 9 drives the blood pump 6.
are operated in synchronization with the R wave of the electrocardiogram detected by the D electrometer 7, respectively. When the electrocardiogram has a waveform as shown in Fig. 3a, the natural movement of the heart is shown as shown in Fig. 3b. This natural ○ movement indicates a change in the internal pressure of the left ventricle, which reaches a pressure of about 120 mH during systole.
When expanded, it becomes approximately zero. In synchronization with this, balloon device 4
The balloon 3 is driven to apply negative pressure during the systole, and to inflate the balloon 3 by introducing compressed air of several tens of tons during the diastole, as shown in FIG. 3c. According to this auxiliary circulation device consisting of a balloon device installed in conjunction with a blood pump, the ventricles of the natural heart have no or only a small amount of blood flowing into them from the atria, and no blood is ejected into the arteries. Even if there is no or only a slight amount, it expands and contracts as it would in a normal case.

Therefore, if we stand in the position of the blood pump 6, we will be in a state where there is no blood flowing there, even though the natural circle is moving. Therefore, there is no risk of a problem in which both influences occur on the aortic pressure waveform, unlike in the conventional case. In addition, by adjusting the amount of compressed air supplied to the balloon 3 using a stroke limiter or the like in the drive device 8, the degree of inflation of the balloon 3 can be changed, so that the degree of inflation of the balloon 3 can be adjusted according to the recovery of the natural mind. It is possible to control the amount of blood that enters the body. Moreover, at this time, the blood pump 6 and the balloon device 4 operate in synchronization with the natural movement of the heart, so there is no possibility of problems such as a sudden increase in heart rate due to the generation of pressure pulse waves. . Therefore, there is no waste that adversely affects the peripheral circulatory system. According to the above-mentioned auxiliary function, recovery of the natural mind can be promoted very effectively. Also, as a matter of course, there is no adverse effect on the blood pump. Note that the present invention is not limited only to the above embodiments.

For example, as shown in FIG. 4, a part of the inner wall surface of the balloon 3 may be fixed to the catheter 1, thereby changing the shape of the balloon 3 when it is inflated. In this case, it is convenient if the expanded shape follows the ventricular shape. Further, the materials for forming the balloon 3 and the catheter 1 may be determined in consideration of compatibility with the living body. In short, the present invention can be implemented with various modifications without departing from the gist thereof.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Figures 1a and b are basic configuration diagrams of the balloon device, Figure 2 is a schematic configuration diagram of the entire device, and Figures 3 a to c are operational diagrams. The waveform diagram and FIG. 4 are configuration diagrams showing a modification of the balloon device. DESCRIPTION OF SYMBOLS 1...catheter, 2...hole, 3...balloon, 4...balloon device, 6...blood pump, 7...cardiac monitor, 8...
Balloon drive device, 9... Blood pump drive device. Ice 1 Diagram O 2 Flame 3 Symbol Diagram

Claims (1)

[Scope of Claims] 1. A blood pump that bypasses blood from the atrium of the heart to the aorta, a blood pump drive device that drives this blood pump in synchronization with an electrocardiogram, and a blood pump that passes through a valve at the apex of the heart or on the artery side. A catheter inserted into the ventricle, a balloon provided at the distal end of the catheter and inflated within the ventricle by compressed air and negative pressure guided through the catheter, an auxiliary device characterized by comprising a balloon drive device that controls the supply of the compressed air and negative pressure to the balloon in synchronization with an electrocardiogram so that the balloon is deflated during its systole and inflated during its diastole. Circulation device. 2. The auxiliary circulation device according to claim 1, wherein a part of the inner wall surface of the balloon is fixed to the catheter so that the shape of the balloon when inflated follows the shape of the ventricle.