Systems and methods for determining blood oxygen saturation values using complex number encoding
First Claim
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1. A physiological monitor that computes arterial oxygen saturation in tissue material, the physiological monitor comprising:
- a light emitter which emits light of at least first and second wavelengths;
a light detector responsive to light from said light emitter attenuated by body tissue, said light detector providing an output signal indicative of at least first and second intensity signals associated with said at least first and second wavelengths; and
one or more hardware processors programmed to encode the first and second intensity signals in a complex domain;
filter artifacts based on the complex encoding of the first and second intensity signals;
compute arterial oxygen saturation from the filtered complex encoding of the first and second intensity signals; and
output the calculated arterial oxygen saturation.
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Abstract
The disclosure includes pulse oximetry systems and methods for determining point-by-point saturation values by encoding photoplethysmographs in the complex domain and processing the complex signals. The systems filter motion artifacts and other noise using a variety of techniques, including statistical analysis such as correlation, or phase filtering.
927 Citations
17 Claims
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1. A physiological monitor that computes arterial oxygen saturation in tissue material, the physiological monitor comprising:
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a light emitter which emits light of at least first and second wavelengths; a light detector responsive to light from said light emitter attenuated by body tissue, said light detector providing an output signal indicative of at least first and second intensity signals associated with said at least first and second wavelengths; and one or more hardware processors programmed to encode the first and second intensity signals in a complex domain;
filter artifacts based on the complex encoding of the first and second intensity signals;
compute arterial oxygen saturation from the filtered complex encoding of the first and second intensity signals; and
output the calculated arterial oxygen saturation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A physiological monitoring method for computing arterial oxygen saturation in tissue material, the physiological monitor method comprising:
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driving a light emitter configured to emit light of at least first and second wavelengths; receiving an output signal indicative from a light detector of at least first and second intensity signals associated with said at least first and second wavelengths; encoding the first and second intensity signals in a complex domain; filtering artifacts from the complex encoding of the first and second intensity signals; computing arterial oxygen saturation based on the filtered complex encoding of the first and second intensity signals; and output the computed arterial oxygen saturation. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification