OPTICAL SENSOR AND METHOD FOR DETECTING A PATIENT CONDITION
First Claim
Patent Images
1. An implantable medical device, comprising:
- a light source emitting a light signal;
a light detector receiving the light signal emitted by the light source and scattered by a volume of body tissue, the light detector emitting a signal correlated to the received light signal, the light detector signal comprising an alternating current component correlated to a pulsatility of blood flow within the volume of body tissue; and
a processor receiving the light detector signal and determining a patient condition in response to the alternating current component of the light detector signal.
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Abstract
An implantable medical device for monitoring tissue perfusion that includes a light source emitting a light signal and a light detector receiving emitted light scattered by a volume of body tissue. The light detector emits a signal having an alternating current component corresponding to the pulsatility of blood flow in the body tissue volume. A processor receives the current signal and determines a patient condition in response to the alternating component of the current signal.
43 Citations
22 Claims
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1. An implantable medical device, comprising:
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a light source emitting a light signal; a light detector receiving the light signal emitted by the light source and scattered by a volume of body tissue, the light detector emitting a signal correlated to the received light signal, the light detector signal comprising an alternating current component correlated to a pulsatility of blood flow within the volume of body tissue; and a processor receiving the light detector signal and determining a patient condition in response to the alternating current component of the light detector signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for use in an implantable medical device, comprising:
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controlling a light source driver signal to cause a light signal to be emitted from a light source; receiving a current signal by a light detector in response to receiving the emitted light signal scattered by a volume of body tissue, the current signal comprising an alternating current component correlated to a pulsatility of blood flow within the volume of body tissue; and determining a patient condition in response to the alternating current component of the current signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An implantable medical device, comprising:
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an electrode sensing a cardiac electrical signal; a light source emitting a modulated light signal; a filter filtering the wavelengths of the modulated light signal scattered by a volume of body tissue; a light detector receiving the filtered modulated light signal and emitting a current signal comprising an alternating current component correlated to a pulsatility of blood flow within the volume of body tissue; a processor receiving the cardiac electrical signal, detecting an arrhythmia in response to the cardiac electrical signal, receiving the light detector signal, determining a pulsatility metric in response to the alternating current component of the light detector signal, comparing the pulsatility metric to a 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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Specification