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 cardiac electrical signals;
a light source for emitting a light signal, anda light detector for receiving the light signal emitted by the light source and scattered by the volume of body tissue, the light detector emitting a signal correlated to the received light signal, the light detector signal having an alternating current component correlated to pulsatility of blood flow within the volume of body tissue; and
a processor configured to receive the cardiac electrical signals, sense events as R-wave events from the cardiac electrical signals, gate the light detector signal for monitoring the alternating current component at a time delay following a sensed R-wave event, receive the gated light detector signal, determine a patient condition in response to the alternating current component of the gated light detector signal, and detect T-wave oversensing in response to the gated 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.
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Citations
25 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 cardiac electrical signals; a light source for emitting a light signal, and a light detector for receiving the light signal emitted by the light source and scattered by the volume of body tissue, the light detector emitting a signal correlated to the received light signal, the light detector signal having an alternating current component correlated to pulsatility of blood flow within the volume of body tissue; and a processor configured to receive the cardiac electrical signals, sense events as R-wave events from the cardiac electrical signals, gate the light detector signal for monitoring the alternating current component at a time delay following a sensed R-wave event, receive the gated light detector signal, determine a patient condition in response to the alternating current component of the gated light detector signal, and detect T-wave oversensing in response to the gated light detector signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 21, 22, 23, 24, 25)
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11. A method for use in an implantable medical device, comprising:
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sensing cardiac electrical signals and sensing events as R-wave events from the cardiac electrical signals; 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; gating the light detector signal for monitoring the alternating current component at a time delay following a sensed R-wave event; determining a patient condition in response to the alternating current component of the gated light detector signal; and detecting T-wave oversensing in response to the gated light detector signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification