Optimal non-constant speed control method for miniature axial flow type blood pumps

Abstract

A method for optimizing the speed control of miniature axial-flow blood pump includes calculating the heart output, the ratio of supplied oxygen to consumed oxygen of cardiac muscle, and the highest systolic pressure and the lowest diastolic pressure of aorta, calculating average rotation speed according to 7 speeds and their running periods, calculating membership function, weighing it to obtaintarget function, and comparing the different schemes for various speeds to obtain optical scheme. Its advantages are high adaptability and safety, and low energy consumption.

Description

technical field [0001] An optimized non-constant speed control method for a miniature axial flow blood pump belongs to the technical field of artificial organ control. Background technique [0002] Heart assist device is a treatment method that uses mechanical or biological means to partially or completely replace the pumping function of the heart to maintain good blood circulation throughout the body. Early auxiliary devices were mostly bionic diaphragm blood pumps. After entering the 1990s, many foreign research centers have turned to the research of micro-impeller (especially axial flow) blood pumps, forming the current mainstream in this field. In 1988, Wampler et al. first introduced the Hemopump, a miniature axial blood pump for temporary circulatory support. Since then, Hemopoump has been gradually used in clinical practice on a small scale. As early as the 1980s, our country started the research work of artificial heart assist device. In the late 1990s, Chinese r...

AI Technical Summary

Problems solved by technology

However, when the speed of the pump is too high, it will cause the "collapse phenomenon" of the left ventricle, which will cause the front end of the drainage catheter of the blood pump to contact the wall of the ventricle, hinder the inflow of the pump, and may even be accompanied by arrhythmia, which will have serious damage to the left ventricle. big destructive effect

At the same time, the high-speed rotating blades will generate greater shear force, which will cause greater damage to red blood cells.

This raises the question: How to determine the optimal rotational speed of an axial flow pump for a particular patient's physiological condition?

[0005] 2) Although Yokihiko has proved in animal experiments that long-term non-pulsatile double-heart assistance will not produce harmful physiological effects, recent research results show that long-term non-pulsatile left heart blood flow may have some adverse effects on the shape and function of the aorta. A series of effects, including changes in the thickness of the vessel wall, the structure of the smooth muscle of the vessel wall, and the function of vasoconstriction, etc.

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