Optical sensor and method for detecting a patient condition
First Claim
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1. An implantable medical device for monitoring blood flow pulsatility in a volume of body tissue in a patient, the device comprising:
- at least two electrodes for sensing a cardiac electrical signal;
a light source for emitting a modulated light signal;
a filter for filtering the wavelengths of the modulated light signal scattered by the volume of body tissue;
a light detector for receiving the filtered modulated light signal and emitting a current signal having an alternating current component correlated to pulsatility of blood flow within the volume of body tissue;
a processor for 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 heart rate determined from the cardiac electrical signal, confirming the arrhythmia in response to the comparison, and detecting T-wave oversensing in response to the cardiac electrical signal being greater than the pulsatility metric, wherein the pulsatility metric is a frequency of the alternating current component and; 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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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.
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Citations
9 Claims
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1. An implantable medical device for monitoring blood flow pulsatility in a volume of body tissue in a patient, the device comprising:
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at least two electrodes for sensing a cardiac electrical signal; a light source for emitting a modulated light signal; a filter for filtering the wavelengths of the modulated light signal scattered by the volume of body tissue; a light detector for receiving the filtered modulated light signal and emitting a current signal having an alternating current component correlated to pulsatility of blood flow within the volume of body tissue; a processor for 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 heart rate determined from the cardiac electrical signal, confirming the arrhythmia in response to the comparison, and detecting T-wave oversensing in response to the cardiac electrical signal being greater than the pulsatility metric, wherein the pulsatility metric is a frequency of the alternating current component and; and a therapy control module coupled to the processor and delivering an anti-arrhythmia therapy in response to the arrhythmia confirmation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification