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US 12,758,763 B2Granted
Estimating maximum flow through a circulatory support device
AssigneeABIOMED, Inc.
InventorsSamuel Brown, Qing Tan, Mohammed Alwatban
Life of this patent
Estimating the term…
Abstract
Methods and apparatus for estimating maximum flow for a heart pump are described. The method comprises receiving data relating motor current to differential pressure measured for a predetermined speed of a motor of the heart pump, extrapolating based on the received data, a first value for the motor current at which the differential pressure is zero, and determining a maximum flow value through the heart pump at the predetermined speed of the motor of the heart pump based, at least in part, on the first value for the motor current.
Claims20
A method of estimating flow through a heart pump, the method comprising:
- receiving data relating motor current to differential pressure measured for a predetermined speed of a motor of the heart pump;
- extrapolating based on the received data, a first value for the motor current at which the differential pressure is zero;
- determining a maximum flow value through the heart pump at the predetermined speed of the motor of the heart pump based, at least in part, on the first value for the motor current;
- configuring the heart pump to estimate flow through the heart pump during operation when implanted in a patient by associating in at least one memory of the heart pump, the maximum flow value and the predetermined speed of the motor of the heart pump;
- receiving, during operation of the heart pump at the predetermined speed, a motor current signal indicating an amount of current provided to a motor of the heart pump over time;
- adjusting the motor current signal based on the maximum flow value to produce an adjusted motor current signal;
- determining the flow through the heart pump based, at least in part, on the adjusted motor current signal;
- and
- outputting an indication of the flow on a user interface associated with the heart pump.
6 more elements
A heart pump, comprising:
- a rotor;
- a motor configured to drive rotation of the rotor at one or more speeds;
- and
- at least one controller configured to:
- control the motor to operate at a first speed of the one or more speeds;
- measure a motor current of the motor while adjusting a differential pressure across the heart pump to generate data relating motor current to differential pressure for the first speed of the motor;
- extrapolate based on the data, a first value for the motor current at which the differential pressure is zero;
- determine a maximum flow value through the heart pump at the first speed of the motor based, at least in part, on the first value for the motor current;
- configure the heart pump to measure flow through the heart pump at the first speed based, at least in part, on the determined maximum flow value,
- wherein configuring the heart pump to measure flow through the heart pump comprises associating in at least one memory of the heart pump, the maximum flow value and the first speed;
- receive, during operation of the heart pump at the first speed, a motor current signal indicating an amount of current provided to a motor of the heart pump over time;
- adjust the motor current signal based on the maximum flow value to produce an adjusted motor current signal;
- determine the flow through the heart pump based, at least in part, on the adjusted motor current signal;
- and
- output an indication of the flow on a user interface associated with the heart pump.
12 more elements
A controller for a heart pump, the controller comprising:
- at least one hardware processor configured to:
- receive data relating motor current to differential pressure measured for a predetermined speed of a motor of the heart pump;
- extrapolate based on the received data, a first value for the motor current at which the differential pressure is zero;
- determine a maximum flow value through the heart pump at the predetermined speed of the motor of the heart pump based, at least in part, on the first value for the motor current;
- configure the controller to determine flow through the heart pump based, at least in part, on the determined maximum flow value,
- wherein configuring the heart pump to measure flow through the heart pump comprises associating in at least one memory of the heart pump, the maximum flow value and the predetermined speed of the motor of the heart pump;
- receive, during operation of the heart pump at the predetermined speed, a motor current signal indicating an amount of current provided to a motor of the heart pump over time;
- adjust the motor current signal based on the maximum flow value to produce an adjusted motor current signal;
- determine the flow through the heart pump based, at least in part, on the adjusted motor current signal;
- and
- output an indication of the flow on a user interface associated with the heart pump.
8 more elements
Dependencies are inferred from the claim text.