Motion compatible sensor for non-invasive optical blood analysis
First Claim
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1. An optical sensor comprising:
- a sensor configured to attach to a patient;
an emitter connected to said sensor;
a detector connected to said sensor and spaced from said emitter to detect reflectance signals;
at least one optical element connected to said sensor to facilitate transmittance signals; and
processing means for utilizing said transmittance signals to process signals produced predominantly by cardiac pulses, and utilizing said reflectance signals to process signals produced predominantly by non-cardiac blood pulses.
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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.
332 Citations
2 Claims
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1. An optical sensor comprising:
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a sensor configured to attach to a patient;
an emitter connected to said sensor;
a detector connected to said sensor and spaced from said emitter to detect reflectance signals;
at least one optical element connected to said sensor to facilitate transmittance signals; and
processing means for utilizing said transmittance signals to process signals produced predominantly by cardiac pulses, and utilizing said reflectance signals to process signals produced predominantly by non-cardiac blood pulses.
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2. An optical sensor comprising:
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a sensor configured to attach to a patient;
an emitter connected to said sensor;
a detector connected to said sensor and spaced from said emitter to detect reflectance signals;
at least one optical element connected to said sensor to facilitate transmittance signals; and
means for allowing the selective activation of said detector to use said reflectance signals in the presence of motion.
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Specification
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Current AssigneeNellocr Puritan Bennett Incorporated
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Original AssigneeNellocr Puritan Bennett Incorporated
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InventorsFlewelling, Ross, Mannheimer, Paul, Chin, Rodney
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Primary Examiner(s)Nasser, Robert L.
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Application NumberUS09/348,437Time in Patent Office1,014 DaysField of Search600/310, 600/316, 600/322-4US Class Current600/322CPC Class CodesA61B 5/14552 Details of sensors speciall...A61B 5/6826 FingerA61B 5/6833 Adhesive patchesA61B 5/6838 Clamps or clipsA61B 5/7207 of noise induced by motion ...
