SU891096A1 - Method and system for controlling pumping device of heart prosthesis - Google Patents

Description

I

The invention relates to medical technology and can be used to completely replace the natural heart with an artificial heart.

There is a known method of controlling an artificial heart pumping device by adjusting the values of the positive and negative gas pressures in the ventricular pneumonitis chamber. This method solves the problem of optimally controlling the increase in the accuracy of the choice of the ratios of the intervals between the commands of the beginning and end of the phases of injection and suction for each ventricle l.

The disadvantage of this method is that only the time for supplying a positive pressure to the pneumatic chamber is controlled and regulated. This time of movement of the diaphragm corresponding to the shock suction volume remains uncontrollable. The policy task of the values of positive and negative pressure with a margin

In order to ensure that the stroke volume is controlled by time intervals, it is associated with the occurrence of high blood flow rates leading to its injury. Also known is a control system for a pumping device of an artificial heart, comprising an electropneumatic valve, positive and negative pressure controllers, a frequency and duty cycle regulator for pneumo pulses, and a blood volume sensor 2.

However, a significant drawback of the system is the inability to control vascular tone.

15 This can lead to the collapse of venous vessels, i.e. to their compression in diastole with a decrease in blood pressure and a constant negative pressure in the pneumatic chamber, with

Claims (2)

20 constant blood pressure and an increase in negative pressure, l1-1bo with unchanged blood pressure in the veins and pressure in the veins and pressure, and the pneumatic chamber in diastole due to a decrease in vascular tone. The purpose of the invention is to provide the possibility of controlling the pumping device of an artificial heart by the tone of the vessels. The goal is achieved by regulating the values of positive and negative gas pressure in the ventricular pneumatic chamber according to the mismatch between the current and predetermined values of the venous vessel compression by a system containing electropneumatic valves, positive and negative pressure regulators, frequency and duty cycle regulators of pneumopulses, blood volume sensor and additionally equipped with a venous vessel compression sensor, a mismatch signal generator and a vessel compression unit, while the first input of the imaging device The error signal is connected to the output of the vessel compression setter, and the second input is connected to the output of the venous vessel compression sensor: the output of the error signal generator is connected to the input of the negative pressure regulator. The drawing shows the control system of an artificial heart pumping device (for the control channel of one ventricle). The control system of the pumping device includes two ventricles 1 (left and right) and two control channels (left and right) for each ventricle, respectively, and contains electropneumatic valve 2, regulators 3 and 4 of positive and negative pressure, regulator 5 parts and the duty cycle of the pneumo pulses, the blood volume sensor 6, the venous vessel compression sensor 7. Shaper 8-signal misalignment and set-points 9compress the vessel. The method can be implemented by controlling the pumping device. The system works as follows. The frequency and duty cycle of the pneumatic pulses in the pneumatic chamber of the ventricle 1 through the electric pneumatic valve 2 with the regulators 3 and A of the positive and negative pressure sets the regulator 5. The sensitivity of the pump and control system to load changes is determined by the presence of a closed control 6. . 4 automatically control the positive pressure by the error signals of the measured and specified values of the sensor 6 of the blood volume of the ventricle. The ability to control according to the tone of the vessels determines the closed loop of the automatic control of the negative pressure regulator 4 by the error signal in the shaper 8. The error signal is larger, the greater the difference in measured value and the specified unit setting 9 vessel compression values. The measured value is obtained at the output of the secondary device of the sensor 7 and than. it is greater, the smaller the value of negative pressure. Thus, if the vascular tone changes downwards, the signal from sensor 7 will increase, the error signal will increase, and the negative pressure will decrease, eliminating collapse of the vessel, despite the fact that even the blood pressure at the inlet of the heart pump has not changed. The proposed device provides the ability to control the heart pump according to the tone of the vessels and increase the sensitivity to venous blood po & vat, as well as to eliminate the collapse (contraction) of the vessels. Claim 1. Method of controlling an artificial heart pumping device by adjusting the magnitude of the positive and negative gas pressure in the ventricular pneumo-chamber, which is so that, in order to enable control of the pumping device according to the tone of the vessels, the negative pressure is mismatched between the current and a given value of the compression of the venous vessel. 2. An artificial heart pumping control system containing an electropneumatic valve, positive and negative pressure regulators, a frequency and duty cycle regulator for pneumo pulses, a blood volume sensor, so that, in order to enable the pumping device to be controlled according to the tone of the vessels, it is additionally equipped with a sensor for compressing the venous vessel, an error signal shaping unit and a vessel compression generator, while the first input of the error signal generator is connected to the compression stroke set point of the vessel and the second input - to the output transducer compression venous vessel: The error output signal shaper is connected 891096 " to the input of the negative pressure regulator, Sources of information received in BHUMaraje during examination I 1. USSR Copyright Certificate No. 434941, cl. L 61 P 1/24, 1971. 2. USSR author's certificate No. 659152, cl. A 61 M 1/03, 1976.