Processing of Photoplethysmography Signals
First Claim
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1. A method of isolating an AC and DC component from a stream of plethysmography signals comprising identifying the peaks and troughs of said plethysmography signals;
- identifying the midpoints or minimum values between said peaks and troughs, wherein the interpolated line connecting said midpoints or minimum values represents said DC component;
extracting said DC component from said plethysmography signals, thereby separately obtaining said AC component, whereby an AC component and DC component are individually isolated.
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Abstract
Disclosed herein are methods and devices of processing photoplethysmography signal information. The methods for processing will allow numerous medical observations and diagnoses from a simple, non-invasive probe.
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Citations
19 Claims
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1. A method of isolating an AC and DC component from a stream of plethysmography signals comprising identifying the peaks and troughs of said plethysmography signals;
- identifying the midpoints or minimum values between said peaks and troughs, wherein the interpolated line connecting said midpoints or minimum values represents said DC component;
extracting said DC component from said plethysmography signals, thereby separately obtaining said AC component, whereby an AC component and DC component are individually isolated. - View Dependent Claims (2, 3)
- identifying the midpoints or minimum values between said peaks and troughs, wherein the interpolated line connecting said midpoints or minimum values represents said DC component;
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4. A system for processing plethysmography signals from a patient comprising
at least one pulse oximeter probe configured for securing to a central source site of said patient and effective to generate a plethysmography signal stream; - and
a computer communicatingly connected to said at least one pulse oximeter probe, said computer comprising at least one processing module, a first computer-readable program code module for causing said computer to process signals of said at least one pulse oximeter probe to obtain an AC component signal or a DC component signal, or both, and a second computer-readable program code module for causing said computer to analyze said AC component signal or DC component signal, or both to determine a decrease in amplitude of either AC component signal or DC component signal, or both. - View Dependent Claims (5)
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6. A computer program product for use with a computer comprising at least one processing module, said product comprising:
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a computer-usable medium comprising computer readable program code modules embodied in said computer-usable medium; computer readable first program code module for causing said computer to process plethysmography signals obtained from a pulse oximeter probe by separating out an AC component signal stream and a DC component signal stream; and computer-readable second program code module for causing said computer to analyze said AC signal stream or said DC signal stream, or both, to determine a decrease in amplitude of either AC component signal or DC component signal, or both.
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7. A method of obtaining processed photoplethysmography readings from an individual, said method comprising:
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obtaining a pulse oximeter probe comprising at least one LED and at least one photodetector; securing said probe onto said individual'"'"'s right and/or left nasal alar, whereby tissue of said nasal alar rests between said at least one photodetector and said at least one LED; and monitoring photoplethysmography signals generated by said probe responsive to blood flow at said tissue of said nasal alar; and isolating an AC and DC component from a stream of plethysmography signals comprising identifying the peaks and troughs of said plethysmography signals;
identifying the midpoints or minimum values between said peaks and troughs, wherein the interpolated line connecting said midpoints or minimum values represents said DC component;
extracting said DC component from said plethysmography signals, thereby separately obtaining said AC component, whereby an AC component and DC component are individually isolated.
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8. A method of isolating an AC and DC component from a stream of plethysmography signals comprising identifying the extrema of said plethysmography signals;
- identifying a common point relative to the extrema, wherein the interpolated line connecting said common points represents said DC component;
extracting said DC component from said plethysmography signals, thereby separately obtaining said AC component, whereby an AC component and DC component are individually isolated. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
- identifying a common point relative to the extrema, wherein the interpolated line connecting said common points represents said DC component;
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17. A method of isolating a high frequency signal content from a low frequency signal content from a stream of plethysmograph signals comprising a high frequency component, a first low frequency component and a second low frequency component said method comprising identifying extrema of said plethysmography signals;
- identifying a common point relative to the extrema, wherein the interpolated line connecting said common points represents the low frequency content of the signal;
extracting said low frequency content from said plethysmography signals, thereby separately obtaining the higher frequency content from the low frequency content. - View Dependent Claims (18, 19)
- identifying a common point relative to the extrema, wherein the interpolated line connecting said common points represents the low frequency content of the signal;
Specification