ECG synchronized pulse oximeter
First Claim
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1. An improved method for determining the oxygen saturation level of a patient'"'"'s blood, comprising the steps of:
- (a) optically measuring the patient'"'"'s arterial blood flow so as to produce a series of optical pulses which are a measure of arterial pulses as well as patient motion and other artifact;
(b) detecting the arterial heartbeat of the patient;
(c) averaging a series of optical pulses within a time frame determined by the arterial heart-beat to derive an average optical pulse; and
(d) determining the oxygen saturation level of the blood based upon the average optical pulse.
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Abstract
A pulse oximeter and method of determining the oxygen saturation level of a patient'"'"'s blood wherein a heartbeat related signal is used, as a reference to guide the averaging of optical pulse waveforms. The oximeter and method assign different weighting to different optical pulses based upon the amplitude of new pulse waveforms and the degree of similarity between it and the preceding waveform. A composite, averaged pulse waveform is then used in computing oxygen saturation level.
327 Citations
15 Claims
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1. An improved method for determining the oxygen saturation level of a patient'"'"'s blood, comprising the steps of:
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(a) optically measuring the patient'"'"'s arterial blood flow so as to produce a series of optical pulses which are a measure of arterial pulses as well as patient motion and other artifact; (b) detecting the arterial heartbeat of the patient; (c) averaging a series of optical pulses within a time frame determined by the arterial heart-beat to derive an average optical pulse; and (d) determining the oxygen saturation level of the blood based upon the average optical pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An improved method for determining the oxygen saturation level of a patient'"'"'s blood, comprising the steps of:
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(a) optically measuring the patient'"'"'s blood flow by passing two different wavelength beams of light through the patient'"'"'s tissue whereby they are modulated by said blood flow and detecting the pulse waveforms of the light so modulated; (b) detecting the ECG, R-wave signal produced by the arterial heartbeat of the patient; (c) identifying and determining the position of the spikes associated with said R-wave; (d) averaging a series of said pulse waveforms for each wavelength within a time frame determined by the relationship of the R-wave spikes to derive an average optical pulse waveform; and (e) determining the oxygen saturation level of the blood based upon the average optical pulse waveform for both wavelengths. - View Dependent Claims (9, 10)
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11. A pulse oximeter for measuring the oxygen saturation level in a patient'"'"'s blood, comprising:
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(a) means for optically detecting blood flow in a patient, including arterial pulses and artifact, as waveforms; (b) means for detecting the arterial pulse of the patient; (c) means for averaging a plurality of said waveforms within a time frame determined by the detected arterial pulse to generate an average waveform; and (d) means for determining the oxygen saturation level of the blood based on the average waveform. - View Dependent Claims (12, 13, 14, 15)
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Specification