METHODS AND SYSTEMS FOR USING AN ESTIMATE SIGNAL TO IMPROVE SIGNAL RESOLUTION IN A PHYSIOLOGICAL MONITOR
First Claim
1. A method for processing a sensor signal in a physiological monitor, the method comprising:
- receiving, using processing equipment, an analog sensor signal corresponding to an intensity of detected light attenuated by a subject, wherein the analog sensor signal comprises at least a first segment corresponding to an ambient light interval and a second segment correspond to an emitted light interval;
generating, using the processing equipment, an analog estimate signal, wherein the analog estimate signal comprises an estimate corresponding to at least a portion of the first segment and an estimate corresponding to at least a portion of the second segment;
generating, using the processing equipment, an analog difference signal based at least in part on the analog sensor signal and the analog estimate signal; and
determining, using the processing equipment, a physiological parameter of the subject based at least in part on the analog difference signal.
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Accused Products
Abstract
A physiological monitoring system may receive a sensor signal from a physiological sensor. The system may generate an estimate of the sensor signal based on, for example, prior received signals. The estimate signal may be subtracted from the sensor signal using a transimpedance amplifier to generate a difference signal. A gain and/or offset may be applied to the difference signal by the amplifier. The amplified difference signal may be digitized and combined with the estimate signal to generate a high resolution digital representation of the sensor signal. Physiological information such as blood oxygen saturation, pulse rate, respiration rate, respiration effort, blood pressure, hemoglobin concentration, any other suitable physiological parameters, or any combination thereof, may be determined using the digitized sensor signal. In some embodiments, the use of the signal estimate and the amplified difference signal in processing physiological parameters may provide high resolution without high power and/or processing requirements.
11 Citations
24 Claims
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1. A method for processing a sensor signal in a physiological monitor, the method comprising:
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receiving, using processing equipment, an analog sensor signal corresponding to an intensity of detected light attenuated by a subject, wherein the analog sensor signal comprises at least a first segment corresponding to an ambient light interval and a second segment correspond to an emitted light interval; generating, using the processing equipment, an analog estimate signal, wherein the analog estimate signal comprises an estimate corresponding to at least a portion of the first segment and an estimate corresponding to at least a portion of the second segment; generating, using the processing equipment, an analog difference signal based at least in part on the analog sensor signal and the analog estimate signal; and determining, using the processing equipment, a physiological parameter of the subject based at least in part on the analog difference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for processing a sensor signal in a physiological monitor, the system comprising:
processing equipment configured to perform operations comprising; receiving an analog sensor signal corresponding to an intensity of detected light attenuated by a subject, wherein the analog sensor signal comprises at least a first segment corresponding to an ambient light interval and a second segment correspond to an emitted light interval; generating an analog estimate signal, wherein the analog estimate signal comprises an estimate corresponding to at least a portion of the first segment and an estimate corresponding to at least a portion of the second segment; generating an analog difference signal based at least in part on the analog sensor signal and the analog estimate signal; and determining a physiological parameter of the subject based at least in part on the analog difference signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for determining a physiological parameter of a subject, comprising:
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receiving, using processing equipment, a signal representing intensity of light attenuated by a subject; generating, using the processing equipment, an estimate signal based at least in part on an idealized light intensity signal; generating, using the processing equipment, a difference signal representing a difference between the received signal and the estimate signal; amplifying, using the processing equipment, the difference signal; and determining, using the processing equipment, a physiological parameter of the subject based at least in part on the amplified difference signal. - View Dependent Claims (23, 24)
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Specification