A fuzzy pi control method based on non-invasive measurement for lvad indiscriminate self-adaptation

Abstract

The present invention provides a fuzzy PI control method based on non-invasive measurement of LVAD indiscriminate self-adaptation. Firstly, the volume of the left ventricle is measured through the telemetry system EMKA of non-invasive measurement, and the filter processing is carried out through a low-pass filter and the pump power-flow lookup table is obtained. The desired average pump flow reference value is used to estimate the desired average pump flow measurement. Further compare the average pump flow reference value with the average pump flow measurement value to obtain a flow deviation value e, fuzzify the flow deviation (e) and the rate of change of the flow deviation (de / dt) to obtain the fuzzy quantities E and EC, and then use Fuzzy method, according to different fuzzy quantities E and EC to determine the change value Δk of the adaptive proportional coefficient and integral coefficient p and Δk i . Finally, the change value Δk of the flow deviation (e), proportional coefficient and integral coefficient p and Δk i The input controller is processed, and the current signal output by the PI controller directly controls the LVAD to achieve the required pump speed ω under different physiological conditions.

Description

technical field [0001] The invention relates to a medical device and a control method for the device, in particular to a control method for controlling an artificial heart pump and meeting the hemodynamic requirements of a human body. Background technique [0002] With the development of society and economy, profound changes have taken place in the way of life of the people, especially the aging of the population and the acceleration of urbanization. The prevalence of risk factors for cardiovascular diseases in China is obvious, leading to a continuous increase in the number of cardiovascular diseases. The number of patients with cardiovascular disease will continue to increase rapidly in the next 10 years. [0003] At present, the death rate of cardiovascular disease accounts for the first place in the total death of urban and rural residents. According to the National Cardiovascular Center Survey in 2017, the rate is 45.01% in rural areas and 42.61% in cities. The disease...

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Problems solved by technology

[0006] In view of the problems in the existing control system, for example, it is mentioned in the patent - control device and method for heart pump (application number: CN201680055521.4) that the rotary blood pump usually operates at a constant speed, and constant speed operation will appear The following problems: first, if the pump speed is too low, it may not be able to maintain the perfusion volume, and reflux may occur; second, if the pump speed is too high, it will pump too much blood from the ventricles, which will cause ventricular aspiration; Both of these abnormalities are not conducive to the later recovery of the heart, so try to avoid them.

A pressure sensor is added to the blood pump and left ventricle, and the sensor is usually affected by drift, so the drift of the sensor alone may lead to inappropriate speed range control, and implanting the sensor in the human heart will bring a series of problems, For example, complications such as thrombosis and hemolysis, which greatly affect the postoperative rehabilitation of the patient's heart

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