MULTI-WAVELENGTH PHYSIOLOGICAL MONITOR
First Claim
1. A physiological monitor for determining blood oxygen saturation of a patient, the physiological monitor comprising:
- a pulse oximetry sensor comprising;
three or more emitters, wherein each emitter is operative to emit light of a different wavelength; and
at least one detector adapted to receive light from the three or more emitters after being attenuated by tissue of a medical patient; and
a processor configured to;
compute a ratio based at least in part on three or more data signals, each of the three or more data signals indicative of light from one of the three or more emitters after being attenuated by the tissue, wherein the ratio comprises a quotient of a first weighted sum of the data signals multiplied by a first set of vector coefficients and a second weighted sum of the data signals multiplied by a second set of vector coefficients; and
determine blood oxygen saturation based at least in part upon a blood oxygen saturation curve using said ratio.
2 Assignments
0 Petitions
Accused Products
Abstract
A physiological monitor for determining blood oxygen saturation of a medical patient includes a sensor, a signal processor and a display. The sensor includes at least three light emitting diodes. Each light emitting diode is adapted to emit light of a different wavelength. The sensor also includes a detector, where the detector is adapted to receive light from the three light emitting diodes after being attenuated by tissue. The detector generates an output signal based at least in part upon the received light. The signal processor determines blood oxygen saturation based at least upon the output signal, and the display provides an indication of the blood oxygen saturation.
-
Citations
18 Claims
-
1. A physiological monitor for determining blood oxygen saturation of a patient, the physiological monitor comprising:
-
a pulse oximetry sensor comprising; three or more emitters, wherein each emitter is operative to emit light of a different wavelength; and at least one detector adapted to receive light from the three or more emitters after being attenuated by tissue of a medical patient; and a processor configured to; compute a ratio based at least in part on three or more data signals, each of the three or more data signals indicative of light from one of the three or more emitters after being attenuated by the tissue, wherein the ratio comprises a quotient of a first weighted sum of the data signals multiplied by a first set of vector coefficients and a second weighted sum of the data signals multiplied by a second set of vector coefficients; and determine blood oxygen saturation based at least in part upon a blood oxygen saturation curve using said ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An apparatus for determining a blood oxygen saturation of a medical patient, the apparatus comprising:
one or more processors configured to; perform a ratio calculation based at least in part on at least three waveforms, each waveform indicative of attenuation of one of at least three wavelengths of light by tissue, wherein the ratio calculation comprises a quotient of a first weighted sum of the at least three waveforms multiplied by a first set of vector coefficients and a second weighted sum of the at least three waveforms multiplied by a second set of vector coefficients, the first and second sets of vector coefficients determined based upon calibration data; and determine a blood oxygen saturation based at least in part upon a blood oxygen saturation curve using the ratio. - View Dependent Claims (10, 11, 12)
-
13. A method of determining the blood oxygen saturation of a patient, the method comprising:
-
receiving at least three data signals, each of the data signals corresponding to one of at least three wavelengths of light that have been attenuated by tissue; calculating a ratio with one or more processors based at least in part on the at least three data signals, wherein the ratio comprises a quotient of a first weighted sum of the at least three data signals multiplied by a first set of vector coefficients and a second weighted sum of the at least three data signals multiplied by a second set of vector coefficients; and determining a blood oxygen saturation based at least in part on a blood oxygen saturation curve using the ratio. - View Dependent Claims (14, 15, 16, 17, 18)
-
Specification