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US 2006/0080047 A1Published application
Systems and methods for determining blood oxygen saturation values using complex number encoding
AssigneeMasimo Laboratories, Inc.
InventorMohamed Diab
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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.
Claims9
An oximeter system comprising:
- a noninvasive optical sensor including a detector capable of outputting an output signal indicative of light attenuated by body tissue, the output signal being usable to obtain values for one or more physiological parameters of the body tissue;
- and
- a processor configured to transform the output signal or a signal processed from the output signal, and under at least certain conditions to determine point-by-point values for the physiological parameters of the body tissue.
A method of determining values of physiological parameters from an output signal of a noninvasive optical sensor, the method comprising:
- receiving first and second intensity signals from a detector capable of detecting light attenuated by tissue of a patient;
- when appropriate, processing said first and second intensity signals in a complex domain;
- and
- using results of said processing to determine values of one or more physiological parameters of the tissue of the patient.
1 more element
Dependencies are inferred from the claim text.