Use of optical fiber sensor as a diagnostic tool in catheter-based medical devices
AssigneeABIOMED, Inc.
InventorsRahul Suresh Gandhi, Tao Zhang
Life of this patent
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Abstract
A blood pump system including an optical sensor configured to detect an optical signal during pumping operation of the blood pump, and an optical fiber configured to transmit the optical signal from the optical fiber sensor to an evaluation device communicatively coupled to the optical fiber sensor. The evaluation device is configured to receive as inputs the transmitted optical signal and a signal indicative of the motor current and determine a mechanical failure event associated with the blood pump based on the motor current and the optical signal.
Claims16
A blood pump system, the system comprising:
- a catheter having proximal and distal ends;
- a blood pump having a motor coupled to the catheter, wherein the motor has a motor current;
- an optical fiber sensor configured to detect an optical signal during pumping operation of the blood pump;
- an optical fiber configured to transmit the optical signal from the optical fiber sensor to an evaluation device communicatively coupled to the optical fiber sensor,
- wherein the evaluation device is configured to:
- receive as inputs the transmitted optical signal and a signal indicative of the motor current,
- calculate a signal to noise ratio (SNR) of the optical signal,
- receive a predetermined threshold for SNR,
- compare the calculated SNR to the predetermined threshold, and
- determine a mechanical failure event associated with the blood pump;
- and
- wherein the mechanical failure event associated with the blood pump is determined by the evaluation device to have occurred when, over a time period:
- (1) the motor current is greater than zero, and
- (2) an increase in the calculated SNR in the time period exceeds the predetermined threshold.
A method of determining a mechanical failure event of a blood pump, the method comprising:
- determining a motor current of a motor that is coupled to a catheter and drives the blood pump;
- detecting an optical signal at the blood pump;
- transmitting the optical signal, using an optical fiber, from the optical fiber sensor to an evaluation device;
- calculating, at the evaluation device, a signal to noise ratio (SNR) based on the transmitted optical signal;
- and
- determining a mechanical failure event associated with the blood pump based on the calculated SNR and the determined motor current, wherein the mechanical failure event associated with the blood pump is determined by the evaluation device to have occurred when, over a time period:
- (1) the motor current is greater than zero and
- (2) an increase in the calculated SNR in the time period exceeds a predetermined threshold.
Dependencies are inferred from the claim text.