Method for extracting and quantifying end diastolic/mitral valve closure point from HVAD estimated flow waveform
A mitral valve and waveform technology, applied in electrocardiography, medical equipment, diagnostic recording/measurement, etc., can solve problems such as current VAD devices do not have
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example 1
[0045] Example 1. A control circuit for a sensorless implantable blood pump comprising a processing circuit configured to generate a set of estimated current and flow waveforms from the sensorless implantable blood pump at least one of; determining the mitral valve closure point from at least one estimated from the group consisting of a current waveform and a flow waveform from the sensorless implantable blood pump;
[0046] Calculate the relative index of preload;
[0047] comparing the relative index of preload to a normal baseline relative index of preload; and
[0048] The speed of the pump is adjusted based on the comparison.
example 2
[0049] Example 2. The control circuit of example 1, wherein the processing circuit is configured to pass a trough between the estimated at least one of the mitral valve closure point and the estimated at least one of the group consisting of a current waveform and a flow waveform. The preload relative index is calculated by dividing the measured amplitude between the peaks and the trough of at least one of the group consisting of a current waveform and a flow waveform.
example 3
[0050] Example 3. The control circuit of any of the preceding examples, wherein the sensorless implantable blood pump is a ventricular assist device.
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