Pressure sensing ventricular assist devices and methods of use
First Claim
1. A blood pump system, the system comprising:
- a blood pump comprising an inflow and an outflow,a pressure sensor coupled with the outflow or the inflow of the blood pump;
a controller operably coupled with the blood pump and the pressure sensor, the controller configured to;
determine a differential pressure across the blood pump based on a rotor drive current signal configured to drive the blood pump;
calculate, with the differential pressure across the blood pump;
1) a pressure at the inflow of the blood pump when the pressure sensor is at the outflow, or
2) a pressure at the outflow of the blood pump when the pressure sensor is at the inflow; and
generate a desired data waveform from the calculated pressure.
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Abstract
The invention generally relates to heart pump systems. In some embodiments, a pressure sensor is provided with a heart pump, either at the inflow or the outflow of the blood pump. The heart pump may further include a flow estimator based on a rotor drive current signal delivered to the rotor. Based on the rotor drive current signal, a differential pressure across the pump may be calculated. The differential pressure in combination with the pressure measurements from the pressure sensor may be used to calculate pressure on the opposite side of the pump from the pressure sensor. In some embodiments, the pressure sensor is located at the outflow of the pump and the pump is coupled with the left ventricle. The differential pressure and pressure measurement may be used to calculate a left ventricular pressure waveform of the patient. With such a measurement, other physiological parameters may be derived.
88 Citations
22 Claims
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1. A blood pump system, the system comprising:
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a blood pump comprising an inflow and an outflow, a pressure sensor coupled with the outflow or the inflow of the blood pump; a controller operably coupled with the blood pump and the pressure sensor, the controller configured to; determine a differential pressure across the blood pump based on a rotor drive current signal configured to drive the blood pump; calculate, with the differential pressure across the blood pump;
1) a pressure at the inflow of the blood pump when the pressure sensor is at the outflow, or
2) a pressure at the outflow of the blood pump when the pressure sensor is at the inflow; andgenerate a desired data waveform from the calculated pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for hemodynamic monitoring of a patient with a heart pump, the method comprising:
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determining a differential pressure measurement across the heart pump having an inflow and an outflow based on a rotor drive current signal configured to drive the heart pump; receiving a pressure measurement from a pressure sensor positioned in the outflow or the inflow of the heart pump; and calculating a desired data waveform based on the differential pressure and the pressure measurement. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification