Percutaneous circulatory support systems and devices including aortic valve insufficiency detection
AssigneeBoston Scientific Scimed, Inc.
InventorsNathan Edwards, Corydon Carlson
Life of this patent
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Abstract
A percutaneous circulatory support system includes an impeller and a motor operably coupled to the impeller. A controller is operably coupled to the motor, and the controller is configured to: drive the motor, the motor thereby rotating the impeller to cause blood to flow; determine that an operating parameter of the system deviates from a symmetric waveform; and in response to determining that the operating parameter deviates from the symmetric waveform, provide an alert of aortic valve insufficiency.
Claims20
A percutaneous circulatory support system, comprising:
- a housing configured to be positioned within a patient;
- an impeller carried within the housing;
- a motor operably coupled to the impeller;
- and
- a controller operably coupled to the motor, the controller being configured to:
- drive the motor, the motor thereby rotating the impeller relative to the housing to cause blood to flow through the housing;
- detect an aortic valve insufficiency in the patient based on a determination that an operating parameter of the motor deviates from a symmetric waveform, the symmetric waveform having a rate of increase in the operating parameter of the motor that is symmetric with a rate of decrease of the operating parameter of the motor;
- and
- in response to determining that the operating parameter deviates from the symmetric waveform, provide an alert of aortic valve insufficiency.
A percutaneous circulatory support system, comprising:
- a housing configured to be positioned within a patient;
- an impeller carried within the housing;
- a motor operably coupled to the impeller;
- and
- a controller operably coupled to the motor, the controller being configured to:
- provide a commanded voltage to the motor, the motor thereby rotating the impeller relative to the housing to cause blood to flow through the housing;
- high pass filter the commanded voltage to provide a commanded voltage rate;
- low pass filter a first portion of the commanded voltage rate to provide an upper voltage envelope corresponding to an increase in the commanded voltage;
- convert a second portion of the commanded voltage rate to a positive voltage rate;
- low pass filter the positive voltage rate to provide a lower voltage envelope corresponding to a decrease in the commanded voltage;
- determine a ratio of the upper voltage envelope to the lower voltage envelope;
- and
- compare the ratio to a threshold;
- in response to determining that the ratio is less than the threshold, provide an alert of aortic valve insufficiency.
A method of operating a percutaneous circulatory support system, the system comprising a housing, an impeller disposed in the housing, a motor operably coupled to the impeller, and a controller operably coupled to the motor, the method comprising:
- driving, via the controller, the motor, the motor thereby rotating the impeller to cause blood to flow through the housing;
- detecting an aortic valve insufficiency in a patient based on determining, via the controller, that an operating parameter of the motor deviates from a symmetric waveform, the symmetric waveform having a rate of increase in the operating parameter of the motor that is symmetric with a rate of decrease of the operating parameter of the motor;
- and
- providing, via the controller, an alert of aortic valve insufficiency in response to determining that the operating parameter deviates from the symmetric waveform.
Dependencies are inferred from the claim text.