Account for preload changes in the left ventricle
AssigneeBoston Scientific Scimed, Inc.
InventorsNeethu Lekshmi Vasudevan Jalaja, Carlos Reyes
Life of this patent
Estimating the term…
Abstract
A method of estimating a patient's cardiac preload in a patient having an implantable blood pump. The method includes generating a current waveform from operation of the implanted blood pump. A beat-to-beat pump filling index (PFI) is calculated, the PFI is calculated by dividing a current amplitude component by a time component, the amplitude component being calculated by subtracting a trough of the current waveform from an inflection point divided by an amplitude difference of peak to trough of the waveform, the time component being calculated by dividing a time between the trough and the inflection point by a time between the peak and the trough. An alert is generated if the PFI deviates from predetermined thresholds.
Claims20
A method of estimating a patient's cardiac preload in a patient having a blood pump, the method comprising:
- generating a current waveform from operation of the blood pump;
- calculating a beat-to-beat pump filling index (PFI), the PFI being calculated by dividing a current amplitude component by a time component, the amplitude component being calculated by subtracting a trough of the current waveform from an inflection point divided by an amplitude difference of peak to trough of the current waveform, the time component being calculated by dividing a time between the trough and the inflection point by a time between the peak and the trough;
- and
- generating an alert if the PFI deviates from predetermined thresholds.
A controller for a blood pump, the controller comprising:
- processing circuitry configured to:
- generate a current waveform from operation of the blood pump;
- calculate a beat-to-beat pump filling index (PFI), the PFI being calculated by
- dividing a current amplitude component by a time component, the amplitude component being calculated by subtracting a trough of the current waveform from an inflection point divided by an amplitude difference of peak to trough of the current waveform, the time component being calculated by dividing a time between the trough and the inflection point by a time between the peak and the trough;
- and
- generate an alert if the PFI deviates from predetermined thresholds.
A controller for a blood pump, the controller comprising:
- processing circuitry configured to:
- generate a current waveform from operation of the blood pump;
- calculate a beat-to-beat pump filling index (PFI), the PFI being calculated by
- dividing a current amplitude component by a time component, the amplitude component being calculated by subtracting a trough of the current waveform from an inflection point divided by an amplitude difference of peak to trough of the current waveform, the time component being calculated by dividing a time between the trough and the inflection point by a time between the peak and the trough;
- and
- increase or decrease a set speed of an impeller of the blood pump if the PFI deviates from a predetermined threshold.
Dependencies are inferred from the claim text.