Motion compatible sensor for non-invasive optical blood analysis
First Claim
1. A photometric processing device for processing detector signals from a radiation detector in a patient sensor also having a radiation emitter, comprising:
- a first processing unit configured to determine a blood parameter from a cardiac signal derived plethysmogram from the detector;
a second processing unit configured to determine the blood parameter from a motion artifact waveform from the detector; and
a control unit configured to utilize the first and second processing units responsive to a motion artifact content of the detector signals.
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Accused Products
Abstract
A non-invasive optical sensor which uses the motion signal to calculate the physiological characteristic being measured. For pulse oximetry, a least squares or a ratio-of-ratios technique can be applied to the motion signal itself. This is made possible by selecting a site on the patient where variations in motion produce signals of two wavelengths which are sufficiently correlated. In particular, it has been determined that a sensor placed on a nail, in particular a thumbnail, exhibits the characteristics of having the red and infrared signals correlated when used for pulse oximetry, and the resulting signals correlate to arterial oxygen saturation.
361 Citations
9 Claims
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1. A photometric processing device for processing detector signals from a radiation detector in a patient sensor also having a radiation emitter, comprising:
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a first processing unit configured to determine a blood parameter from a cardiac signal derived plethysmogram from the detector; a second processing unit configured to determine the blood parameter from a motion artifact waveform from the detector; and a control unit configured to utilize the first and second processing units responsive to a motion artifact content of the detector signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification