Method and system for physiologic control of a blood pump
First Claim
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1. A method of controlling a blood pump, comprising:
- analyzing an instantaneous flow waveform in both the time domain and frequency domain; and
controlling the pump in response thereto.
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Abstract
A physiologic control system and method for controlling a blood pump system such as a VAD system. The pump system includes, for example, a blood pump (12) and a controller (80) for controlling the pump. The system may further include a flow measurement device (124). Various control schemes are disclosed, including according controlling the pump to achieve one or more of a desired speed, flow rate, or flow pulsatility. Additionally, various methods for determining maximal flow (the maximum flow that can be achieved for the patient while maintaining certain parameters or within certain boundaries) are disclosed.
69 Citations
19 Claims
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1. A method of controlling a blood pump, comprising:
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analyzing an instantaneous flow waveform in both the time domain and frequency domain; and
controlling the pump in response thereto. - View Dependent Claims (6, 8, 10, 11, 12, 16, 17)
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2. A method of controlling a blood pump, comprising:
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analyzing instantaneous and mean values of pump power or pump current;
analyzing pump flow; and
determining a pump speed in response thereto.
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3. A method of controlling a blood pump, comprising:
calculating and maintaining a desired flow rate based on an interpolation of a desired flow rate at rest heart rate and a desired flow rate at exercise heart rate. - View Dependent Claims (4, 5)
- 7. A method of controlling a blood pump, the control method having a constant speed, a constant flow, a constant peak-to-peak amplitude, and a maximal control mode.
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9. A method of controlling a blood pump which allows selectable levels of unloading with higher levels of unloading presenting a greater risk of running the pump closer to suction.
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13. A method of controlling a blood pump which maintains or maximizes the ratio of diastolic flow to mean flow.
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14. A method of controlling a blood pump which maintains or maximizes the ratio of peak diastolic flow to mean flow.
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18. A method of controlling a blood pump, comprising adapting to a patient'"'"'s individual physiology in response to suction detection events, repeated attempts at achieving a desired dQ/dn or repeated attempts at dW/dn.
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19. A method of controlling a blood pump, comprising adapting to a patient'"'"'s individual physiology in response to speed variations, by adapting the desired peak-to-peak flow amplitude to changes of flow and power at repeated variations of speed.
Specification