Quantifying laser-doppler perfusion signal for arrhythmia detection and disease monitoring
First Claim
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1. A medical device system for monitoring tissue perfusion in a patient, comprising:
- a laser Doppler unit comprising a coherent laser light source and a photodetector;
a signal processor comprising a plurality of bandpass filters each having a distinct center frequency and bandwidth, wherein the signal processor is configured to receive a signal from the photodetector, apply the bandpass filters to the photodetector signal, and select a first passband signal output from a first one of the plurality of filters to determine a tissue perfusion measurement from the filtered signal;
and a monitoring unit configured to receive the tissue perfusion measurement and to detect a physiological condition of the patient in response to the tissue perfusion measurement.
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Abstract
A medical device system and associated method to control a laser Doppler unit to emit light from a coherent laser light source and collect a photodetector signal produced by the laser Doppler unit by a signal processor comprising a bandpass filter. The bandpass filter is applied to the photodetector signal to determine a tissue perfusion measurement from the filtered signal. A monitoring unit is enabled to receive the tissue perfusion measurement to detect a physiological condition of the patient in response to the tissue perfusion measurement.
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Citations
19 Claims
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1. A medical device system for monitoring tissue perfusion in a patient, comprising:
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a laser Doppler unit comprising a coherent laser light source and a photodetector; a signal processor comprising a plurality of bandpass filters each having a distinct center frequency and bandwidth, wherein the signal processor is configured to receive a signal from the photodetector, apply the bandpass filters to the photodetector signal, and select a first passband signal output from a first one of the plurality of filters to determine a tissue perfusion measurement from the filtered signal; and a monitoring unit configured to receive the tissue perfusion measurement and to detect a physiological condition of the patient in response to the tissue perfusion measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for monitoring a patient using a medical device system comprising a laser Doppler unit, the method comprising:
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controlling the laser Doppler unit to emit light from a coherent laser light source; collecting a photodetector signal produced by the laser Doppler unit using a signal processor comprising a plurality of bandpass filters each having a distinct center frequency and bandwidth; applying the bandpass filters to the photodetector signal and selecting a first passband signal output from a first one of the plurality of filters to determine a tissue perfusion measurement from the filtered signal; and enabling a monitoring unit to receive the tissue perfusion measurement and detect a physiological condition of the patient in response to the tissue perfusion measurement. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A non-transitory computer-readable medium storing a set of instructions which cause a medical device system comprising a laser Doppler unit to perform a method comprising:
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controlling the laser Doppler unit to emit light from a coherent laser light source; collecting a photodetector signal produced by the laser Doppler unit using a signal processor comprising a plurality of bandpass filters each having a distinct center frequency and bandwidth; applying the bandpass filters to the photodetector signal; selecting a first passband signal output from a first one of the plurality of filters to determine a tissue perfusion measurement from the filtered signal; and enabling a monitoring unit to receive the tissue perfusion measurement and detect a physiological condition of the patient in response to the tissue perfusion measurement.
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Specification