Motion compatible sensor for non-invasive optical blood analysis
First Claim
1. A system for determining an arterial blood constituent of a patient, comprising:
- a processing device in communication with a detector to process a detector signal from said detector representing a motion artifact pulse, said motion artifact pulse having been generated by movement intiated by said patient, for determination of said blood constituent.
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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.
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Citations
16 Claims
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1. A system for determining an arterial blood constituent of a patient, comprising:
a processing device in communication with a detector to process a detector signal from said detector representing a motion artifact pulse, said motion artifact pulse having been generated by movement intiated by said patient, for determination of said blood constituent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
Specification