Motion compatible sensor for non-invasive optical blood analysis
First Claim
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1. An optical sensor comprising:
- a sensor body configured to attach to a distal end portion of a patient'"'"'s digit, the sensor body housing a light emitter and a light detector; and
a flexible circuit having a first portion operatively connected to the light emitter and to the light detector, having a second portion that is accordion-shaped and that extends over at least one joint of the patient'"'"'s digit, and having a third portion configured to be secured to a proximal end portion of the patient'"'"'s digit, wherein the accordion-shaped second portion is configured to move independently of the sensor body.
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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.
763 Citations
13 Claims
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1. An optical sensor comprising:
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a sensor body configured to attach to a distal end portion of a patient'"'"'s digit, the sensor body housing a light emitter and a light detector; and a flexible circuit having a first portion operatively connected to the light emitter and to the light detector, having a second portion that is accordion-shaped and that extends over at least one joint of the patient'"'"'s digit, and having a third portion configured to be secured to a proximal end portion of the patient'"'"'s digit, wherein the accordion-shaped second portion is configured to move independently of the sensor body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of reducing light shunting in an optical sensor, comprising:
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emitting light into a tissue with a light emitter disposed in a sensor body, the sensor body configured to attach to a distal end portion of a patient'"'"'s digit; detecting the light from the tissue with the light detector disposed in the sensor body; generating a signal based on the detected light; and transmitting the signal to a monitor via a first portion of a flexible circuit operatively connected to the light emitter and to the light detector via a second portion of the flexible circuit that is accordion-shaped and that extends over at least one joint of the patient'"'"'s digit and via a third portion of the flexible circuit configured to be secured to a proximal end portion of the patient'"'"'s finger wherein the accordion-shaped second portion is configured to move independently of the sensor body. - View Dependent Claims (11, 12, 13)
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Specification