System and method for a non-invasive medical sensor
Inventors
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Publication Number
US-8271063-B2
Publication Date
2012-09-18
Expiration Date
Abstract
A sensor is disclosed having one or more light sources, and one or more light detectors. At least one of the detectors produces an output in response to received light. Also, electrical circuitry in response to the output generates a pulse waveform proportional to the arterial and venous pulse of a human body, wherein the pulse waveform is used to synchronize an arterial-pulse measurement of the absorption or reflectance of one or more coherent light sources.
Core Innovation
The provided content describes a non-invasive optical blood-measurement sensor comprising one or more coherent light sources, a broadband light source, and wavelength detectors mounted opposite the sources. At least one detector produces an output value corresponding to a ratio that indicates the centroid wavelength of received light. The sensor utilizes this output value to characterize light received from the emitted sources.
The system processes arterial and venous pulse signals to synchronize coherent-light absorption or reflectance measurements and calculate blood parameters. The description identifies self-calibration and temperature compensation for source wavelength shifts while reducing motion-related false pulses. The background section is not included, so the problem addressed is not explicitly described in patent.
Claims Coverage
The claims identify two inventive features across two independent claims covering an optical measurement apparatus and an optical measurement method.
Optical measurement apparatus
The apparatus claim recites a sensor comprising one or more coherent light sources, one broadband light source, and one or more wavelength detectors mounted opposite the sources. At least one detector produces an output value corresponding to a ratio indicating the centroid wavelength of received light, with related claim elements covering pulse-based synchronization of absorption or reflectance measurements.
Optical measurement method
The method claim recites emitting light from one or more coherent light sources and at least one broadband light source, receiving incident light radiation from at least one emitted light, and producing an output value corresponding to a ratio indicating the centroid wavelength of the received radiation to calculate blood parameters.
The two independent claims cover an apparatus and a method combining coherent and broadband light emission with centroid-wavelength ratio detection, supplemented by pulse-synchronized measurements and blood-parameter calculations.
Stated Advantages
Signals coinciding with arterial and venous pulses reduce or eliminate false pulses caused by motion of a portion of the human body.
Documented Applications
Measurement of coherent-light absorption or reflectance through a portion of the human body, or light reflected from human skin.
Oximetry and other blood-constituent measurements, including calculating oxygen saturation, carbon-monoxide concentration, or another blood parameter using arterial and venous pulses.
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