CYANOTIC INFANT SENSOR
First Claim
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1. A pulse oximetry sensor comprising:
- a plurality of emitters configured to transmit light having a plurality of wavelengths into a fleshy medium; and
a detector responsive to said light after absorption by constituents of pulsatile blood flowing within said medium so as to generate a plurality of intensity signals,wherein said emitters and said detector are selected from emitters matched to detectors so that variations in a DC detector response ratio at said wavelengths can be generally attributed to variations in a mean pathlength ratio at said wavelengths.
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Abstract
A pulse oximetry sensor comprises emitters configured to transmit light having a plurality of wavelengths into a fleshy medium. A detector is responsive to the emitted light after absorption by constituents of pulsatile blood flowing within the medium so as to generate intensity signals. A sensor head has a light absorbing surface adapted to be disposed proximate the medium. The emitters and the detector are disposed proximate the sensor head. A detector window is defined by the sensor head and configured so as to limit the field-of-view of the detector.
94 Citations
13 Claims
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1. A pulse oximetry sensor comprising:
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a plurality of emitters configured to transmit light having a plurality of wavelengths into a fleshy medium; and a detector responsive to said light after absorption by constituents of pulsatile blood flowing within said medium so as to generate a plurality of intensity signals, wherein said emitters and said detector are selected from emitters matched to detectors so that variations in a DC detector response ratio at said wavelengths can be generally attributed to variations in a mean pathlength ratio at said wavelengths. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pulse oximetry method comprising the steps of:
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transmitting light from emitters, said light having a plurality wavelengths into a fleshy medium; detecting said transmitted light with detectors matched to said emitters, said light detected after absorption by constituents of pulsatile blood flowing within said medium so as to generate a corresponding plurality of intensity signals; and calculating a DC response ratio from said intensity signals, said matching ensuring said ratio corresponds to a ratio of mean pathlengths of said transmitted light through said fleshy medium. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A pulse oximeter comprising a noninvasive sensor outputting a signal indicative of light attenuated by body tissue;
- and a processor configured to process said signal and determine whether a cyanotic condition is occurring in a monitored infant.
Specification