Sensorless flow measurement method and measurement device for ventricular assist device
A ventricular assist device and flow measurement technology, applied in the field of medical devices, can solve problems such as unfavorable implementation, invasive measurement, complex calculation, large volume and weight, etc.
Active Publication Date: 2018-05-22
HANGTIANTAIXIN TECH CO LTD
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Problems solved by technology
[0005] In order to solve the problems that the existing direct measurement method of the output blood flow of the ventricular assist device has large volume and weight, high power consumption, invasive measurement, and the existing indirect measurement method is complicated in calculation and is not conducive to realization, the present invention provides a ventricular The sensorless flow measuring method and measuring device of the auxiliary device, the measuring scheme does not need to implant sensors in the human body, and is easy to operate, convenient to correct, and has high real-time measurement
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[0036] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.
[0037] figure 1 A flow chart of a sensorless flow measurement method for a ventricular assist device provided in an embodiment of the present invention, the method includes the following steps:
[0038] S1: drawing blood to measure the blood hematocrit H% of the subject;
[0039] S2: Convert the current blood viscosity value of the subject to be measured according to the blood hematocrit H%;
[0040] S3: call the first coefficient a, the second coefficient b, and the third coefficient c corresponding to the viscosity value according to the current blood viscosity value of the object to be measured;
[0041] S4: Acquire the voltage U, current I and rotor speed ω of the current ventricular assist device, and calculate according to the formula Calculate...
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The invention provides a sensor-free flow rate measuring method and measuring device for a ventricular assisting device, and belongs to the field of medical appliances. The method and the device are used for solving the problems of great height, high power consumption and measurement invasiveness of the existing direct measuring method and the problems of calculation complexity and realization difficulty of the existing indirect measuring method. The method provided by the invention comprises the following steps of measuring the red blood cell hematocrit of an object to be measured through blood drawing; the current blood viscosity value of the object to be measured is calculated according to the red blood cell hematocrit; the first coefficient a, the second coefficient b and the third coefficient c corresponding to the viscosity value are called according to the current blood viscosity value of the object to be measured; the voltage U, the current I and the rotor rotating speed omega of the ventricular assist device at present are collected; and the flow rate Q of the ventricular assist device at present is calculated according to a formula shown as the accompanying drawing. According to the measuring scheme, the implantation of a sensor in the human body is not needed; the operation is simple; the correction is convenient; and the measurement real-time performance is good.
Description
technical field [0001] The invention relates to the field of medical devices, in particular to a sensorless flow measurement method and a measurement device for a ventricular assist device. Background technique [0002] Ventricular assist devices can be used to provide assistance to patients with heart failure. For example, the left ventricular assist device LVAD can draw blood from the left ventricle of the natural heart, and then under a certain pressure difference (such as 10-120mmHg), a certain flow rate (such as 2 ~7L / min) to pump a certain amount of blood into the human artery, thereby reducing the workload of the natural heart and achieving the effect of ventricular assistance. [0003] For different heart failure patients, due to differences in age, height and other reasons, how much auxiliary flow is required is not the same. Even for the same person, due to different physiological states, such as exercise, rest, etc., the flow required is not the same. Therefore,...
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IPC IPC(8): A61M1/10
CPCA61M2205/3327A61M2205/3334A61M60/00
Inventor 许剑王博姜洋高航刘雯
Owner HANGTIANTAIXIN TECH CO LTD