Optical sensor confidence algorithm
First Claim
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1. A method for use with an implantable optical sensor, comprising:
- emitting light from a light emitting portion of the optical sensor;
sensing light emitted through a lens of the emitting portion and scattered by a measurement volume through a lens of a light detecting portion of the optical sensor, the sensed light corresponding to a first wavelength, the light emitting portion and the light detecting portion separated by a light barrier;
deriving a metric in response to the sensed light, the metric correlated to the presence of overgrowth on the sensor;
comparing the metric to a predetermined threshold; and
determining the presence of overgrowth on the sensor in response to the comparing.
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Abstract
An implantable medical device system including an optical sensor monitors for the presence of overgrowth on the sensor by sensing light scattered by a measurement volume, the sensed light corresponding to a first wavelength, and deriving an overgrowth metric in response to the sensed light. The overgrowth metric is correlated to the presence of overgrowth on the sensor and is compared to a predetermined threshold. The presence of overgrowth on or near the sensor is detected in response to the overgrowth metric crossing the threshold.
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Citations
20 Claims
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1. A method for use with an implantable optical sensor, comprising:
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emitting light from a light emitting portion of the optical sensor; sensing light emitted through a lens of the emitting portion and scattered by a measurement volume through a lens of a light detecting portion of the optical sensor, the sensed light corresponding to a first wavelength, the light emitting portion and the light detecting portion separated by a light barrier; deriving a metric in response to the sensed light, the metric correlated to the presence of overgrowth on the sensor; comparing the metric to a predetermined threshold; and determining the presence of overgrowth on the sensor in response to the comparing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A non-transitory computer readable medium for storing a set of instructions which when implemented in an implantable medical device system including an optical sensor cause the system to:
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emit light from a light emitting portion of the optical sensor; sense light emitted through a lens of the emitting portion and scattered by a measurement volume through a lens of a light detecting portion of the optical sensor and corresponding to a first wavelength, the light emitting portion and the light detecting portion separated by a light barrier; derive a metric in response to the sensed light, the metric correlated to the presence of overgrowth on the sensor; compare the metric to a predetermined threshold; and determine the presence of overgrowth on the sensor in response to the comparing.
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12. An implantable medical device, comprising:
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an optical sensor comprising an emitting portion and a detecting portion separated by an light barrier and configured to sense light emitted through a lens of the emitting portion and scattered by a measurement volume through a lens of the detecting portion, the light corresponding to a first wavelength; a control module configured to receive a signal from the optical sensor corresponding to the sensed light, derive a metric in response to the received signal, the metric correlated to the presence of overgrowth on the sensor, compare the metric to a predetermined threshold; and
determine the presence of overgrowth on the sensor in response to the comparing. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification