Control device and method for a heart pump
A control device for a heart pump, comprising a device for establishing the end-diastolic filling pressure in a ventricle and a device for associating a delivery rate of the pump, in particular a pump speed or an electric pump capacity, with the established end-diastolic filling pressure. By taking into account the end-diastolic filling pressure, a robust operating option of the heart pump, similar to the physio-logical control, is created.
1. A control device for a heart pump comprising:
a processor configured to determine a value for an end-diastolic filling pressure in a ventricle from a pressure profile comprising ventricle pressures sensed during a cardiac cycle, the end-diastolic filling pressure being a pressure in the ventricle at a transition point where diastole ends and systole starts; and
a memory device comprising a plurality of values for the end-diastolic filling pressure, a plurality of corresponding values characterising an operating parameter of the pump, and an association between the plurality of values for the end-diastolic filling pressure and the plurality of corresponding values characterising the operating parameter of the pump, wherein a non-linear, static relationship exists in the memory device between the values for the end-diastolic filling pressure and the corresponding values characterising the operating parameter of the pump;
wherein the processor is configured to determine a value characterising the operating parameter of the pump, based on a difference between a target end-diastolic filling pressure value and the determined value for the end-diastolic filling pressure, from the association between the values for the end-diastolic filling pressure and the corresponding values characterising the operating parameter, wherein the operating parameter comprises a delivery rate of the pump, a pump speed, or an electric pump capacity, and
wherein the processor is configured to control the heart pump using the determined value characterising the operating parameter in order to control the end-diastolic filling pressure.
2. The control device according to claim 1 , wherein the control device is configured to be connected to an absolute pressure sensor configured to be arranged in a heart chamber or to another pressure-measuring device.
3. The control device according to claim 2 , further comprising a device connected with the absolute pressure sensor that corrects a measured absolute pressure measured from the absolute pressure sensor based on a determined atmospheric pressure.
4. The control device according to claim 1 , wherein the control device comprises a proportional controller.
5. The control device according to claim 1 , wherein the operating parameter of the pump comprises the pump speed or the electric pump capacity.
6. The control device according to claim 1 , wherein the memory device is configured to store a plurality of ranges of the determined end-diastolic filling pressure, wherein each of the ranges is stored in association with a corresponding controller gain.
7. A non-transitory computer readable medium that includes instructions executable by a processor, the computer readable medium comprising:
instructions to determine a value for an end-diastolic filling pressure in a ventricle from a pressure profile comprising ventricle pressures sensed during a cardiac cycle, the end-diastolic filling pressure being a pressure in the ventricle at a transition point where diastole ends and systole starts;
instructions to determine a value characterising an operating parameter of a pump, based on a difference between a target end-diastolic filling pressure value and the determined value for the end-diastolic filling pressure, from an association between a plurality of values for the end-diastolic filling pressure and a plurality of corresponding values characterising the operating parameter of the pump, wherein a non-linear, static relationship exists between the values for the end-diastolic filling pressure and the corresponding values characterising the operating parameter of the pump, further wherein the operating parameter comprises a delivery rate of a pump, a pump speed, or an electric pump capacity; and
instructions to control the end-diastolic filling pressure by control of the pump using the determined value characterising the operating parameter of the pump.
8. A method for controlling a heart pump, the method comprising:
determining an association between a plurality of values for an end-diastolic filling pressure and a plurality of corresponding values characterising an operating parameter of the pump using an echocardiographic measurement of an emptying of the left ventricle or of a delivery volume of the left ventricle;
determining a value for the end-diastolic filling pressure in a heart chamber of a heart from a pressure profile comprising heart chamber pressures measured with an absolute pressure sensor during a cardiac cycle, the end-diastolic filling pressure being a pressure in a ventricle at a transition point where diastole ends and systole starts;
determining a value characterising an operating parameter of the pump based on a difference between a target end-diastolic filling pressure value and the determined value for the end-diastolic filling pressure from the association between the plurality of values for the end-diastolic filling pressure and the plurality of corresponding values characterising the operating parameter of the pump, wherein a non-linear, static relationship exists between the values for the end-diastolic filling pressure and the corresponding values characterising the operating parameter of the pump, further wherein the operating parameter comprises a delivery rate of a pump, a pump speed, or an electric pump capacity; and
controlling the end-diastolic filling pressure by controlling the pump using the determined value characterising the operating parameter of the pump.
9. The method according to claim 8 , wherein controlling the pump comprises controlling the pump with a proportional control and
wherein the delivery rate of the pump comprises the pump speed or a pump capacity.