OPTICAL SENSOR AND METHOD FOR DETECTING A PATIENT CONDITION
First Claim
Patent Images
1. An implantable medical device, comprising:
- a light source emitting light comprising a first light wavelength corresponding to a blue to ultraviolet light spectrum;
a light detector receiving light emitted by the light source and scattered by a volume of body tissue, the light detector emitting a first signal correlated to the received light having the first light wavelength; and
a processor receiving the first signal from the light detector and determining a patient condition in response to the signal.
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Abstract
An implantable medical device for monitoring tissue perfusion that includes a light source emitting light having a light wavelength corresponding to a blue to ultraviolet light spectrum and a light detector receiving light emitted by the light source and scattered by a volume of body tissue. The light detector emits a signal correlated to the received light wavelength, and a processor receives the signal from the light detector and determines a patient condition in response to the signal.
31 Citations
22 Claims
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1. An implantable medical device, comprising:
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a light source emitting light comprising a first light wavelength corresponding to a blue to ultraviolet light spectrum; a light detector receiving light emitted by the light source and scattered by a volume of body tissue, the light detector emitting a first signal correlated to the received light having the first light wavelength; and a processor receiving the first signal from the light detector and determining a patient condition in response to the signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An implantable medical device, comprising:
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an electrode sensing a cardiac electrical signal; a light source emitting light comprising a first light wavelength corresponding to a blue to ultraviolet light spectrum and a second light wavelength corresponding to a red to infrared light spectrum; a light detector receiving light emitted by the light source, the light detector comprising a first filtered photodetector selectively detecting light corresponding to the first light wavelength and a second filtered photodetector selectively detecting light corresponding to the second light wavelength, the light detector emitting a first signal correlated to the received light having the first light wavelength and a second signal correlated to the received light having the second light wavelength; a processor receiving the cardiac electrical signal, detecting an arrhythmia in response to the cardiac electrical signal, receiving the first signal and the second signal from the light detector, determining a divergence between the first light signal and the second light signal at predetermined time intervals following detecting the arrhythmia, comparing the divergence to a predetermined time-dependent threshold, and confirming the arrhythmia in response to the comparison; and a therapy control module coupled to the processor and delivering an anti-arrhythmia therapy in response to the arrhythmia confirmation.
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15. A method for monitoring a physiological condition for use in an implantable medical device, comprising:
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emitting light comprising a first light wavelength corresponding to a blue to ultraviolet light spectrum from a light source; detecting light having the first light wavelength and scattered by a volume of body tissue, and emitting a first signal correlated to the detected light having the first light wavelength; and determining a patient condition in response to the first signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification