Method and apparatus for processing signals reflecting physiological characteristics from multiple sensors
First Claim
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1. A device for the monitoring of a physiological characteristic of a patient'"'"'s blood, comprising:
- a first sensor having a first radiation emitter that emits light at a first wavelength, a second radiation emitter that emits light at a second wavelength and a radiation detector configured to receive light at said first and second wavelengths after absorbance through the patient'"'"'s blood and provide a first received intensity signal and a second received intensity signal corresponding to said first and second received wavelengths;
a second sensor having a first radiation emitter that emits light at a first wavelength, a second radiation emitter that emits light at a second wavelength and a radiation detector configured to receive light at said first and second wavelengths after absorbance through the patient'"'"'s blood and provide a first received intensity signal and a second received intensity signal corresponding to said first and second received wavelengths; and
a controller for computing said physiological characteristic of said patient'"'"'s blood from first corrected intensity signals from said first and second sensors and second corrected intensity signals from said first and second sensors;
wherein said corrected intensity signals are derived by performing an error minimizing mathematical combination between i) said first received intensity signal from said first sensor and said first received intensity signal from said second sensor, ii) said second received intensity signal from said first sensor and said second received intensity signal from said second sensor, iii) said first received intensity signal from said first sensor and said second received intensity signal from said first sensor, and iv) said first received intensity signal from said second sensor and said second received intensity signal from said second sensor.
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Abstract
The invention comprises a method and apparatus for processing signals reflecting a physiological characteristic by performing an error minimizing mathematical combination between signals from at least two independent sensors. For example, the intensity of light is detected following tissue absorption at two wavelengths and the signals are corrected. Preferably, corrected intensity signals are derived by orthogonal regression. In one embodiment, the method and apparatus are used to determine arterial oxygen saturation.
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Citations
22 Claims
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1. A device for the monitoring of a physiological characteristic of a patient'"'"'s blood, comprising:
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a first sensor having a first radiation emitter that emits light at a first wavelength, a second radiation emitter that emits light at a second wavelength and a radiation detector configured to receive light at said first and second wavelengths after absorbance through the patient'"'"'s blood and provide a first received intensity signal and a second received intensity signal corresponding to said first and second received wavelengths;
a second sensor having a first radiation emitter that emits light at a first wavelength, a second radiation emitter that emits light at a second wavelength and a radiation detector configured to receive light at said first and second wavelengths after absorbance through the patient'"'"'s blood and provide a first received intensity signal and a second received intensity signal corresponding to said first and second received wavelengths; and
a controller for computing said physiological characteristic of said patient'"'"'s blood from first corrected intensity signals from said first and second sensors and second corrected intensity signals from said first and second sensors;
wherein said corrected intensity signals are derived by performing an error minimizing mathematical combination between i) said first received intensity signal from said first sensor and said first received intensity signal from said second sensor, ii) said second received intensity signal from said first sensor and said second received intensity signal from said second sensor, iii) said first received intensity signal from said first sensor and said second received intensity signal from said first sensor, and iv) said first received intensity signal from said second sensor and said second received intensity signal from said second sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for processing signals reflecting a physiological characteristic of a patient'"'"'s blood, comprising the steps of:
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coupling a first and second oximeter sensor arrangement to independent tissue regions of said patient;
passing first and second lights through said patient'"'"'s tissue region at each sensor arrangement, wherein said first light is substantially in a red light range and said second light is substantially in an infrared light range;
detecting said first and second lights absorbed by said tissue region and providing a first received intensity signal and a second received intensity signal corresponding to said absorbed first and second lights with each sensor arrangement; and
computing said physiological characteristic of said patient'"'"'s blood from first corrected intensity signals from each sensor arrangement and second corrected intensity signals from each sensor arrangement determined by performing an error minimizing mathematical combination between i) said first received intensity signal from said first sensor arrangement and said first received intensity signal from said second sensor arrangement, ii) said second received intensity signal from said first sensor arrangement and said second received intensity signal from said second sensor arrangement, iii) said first received intensity signal from said first sensor arrangement and said second received intensity signal from said first sensor arrangement, and iv) said first received intensity signal from said second sensor arrangement and said second received intensity signal from said second sensor arrangement. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A method for processing signals reflecting a physiological characteristic of a patient'"'"'s blood, comprising the steps of:
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coupling a first and second physiological sensor arrangement to independent tissue regions of said patient;
detecting a signal reflecting said physiological characteristic with each sensor arrangement; and
computing said physiological characteristic of said patient'"'"'s blood from corrected signals from each sensor arrangement determined by performing an error minimizing mathematical combination between said signal from said first sensor arrangement and said signal from said second sensor arrangement.
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Specification