PLETHYSMOGRAPHIC RESPIRATION PROCESSOR
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Abstract
A plethysmographic respiration processor is responsive to respiratory effects appearing on a blood volume waveform and the corresponding detected intensity waveform measured with an optical sensor at a blood perfused peripheral tissue site so as to provide a measurement of respiration rate. A preprocessor identifies a windowed pleth corresponding to a physiologically acceptable series of plethysmograph waveform pulses. Multiple processors derive different parameters responsive to particular respiratory effects on the windowed pleth. Decision logic determines a respiration rate based upon at least a portion of these parameters.
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Citations
40 Claims
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1-20. -20. (canceled)
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21. A respiration rate detection method comprising:
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identifying a portion of a plethysmograph waveform which includes a physiologically acceptable series of plethysmograph waveform pulses; deriving, using one or more processors, a plurality of different frequency spectrums from the portion of the plethysmograph waveform using a plurality of different techniques, each of the plurality of different frequency spectrums responsive to at least one respiratory effect on the portion of the plethysmograph waveform and including a plurality of local maximums, the plurality of different frequency spectrums comprising a first frequency spectrum and a second frequency spectrum, wherein the first frequency spectrum is one of; a baseline frequency spectrum responsive to a respiratory-induced baseline shift of the portion of the plethysmograph waveform, an amplitude modulation (AM) frequency spectrum responsive to a respiratory-induced amplitude modulation of the portion of the plethysmograph waveform, and a shape modulation (SM) frequency spectrum responsive to a respiratory-induced shape modulation of the portion of the plethysmograph waveform, wherein second frequency spectrum is different from the first frequency spectrum and is one of the baseline frequency spectrum, the AM frequency spectrum, and the SM frequency spectrum; determining whether the local maximums of the first frequency spectrum and the second frequency spectrum occur at matching frequencies within a tolerance; and generating a respiration rate from determining that at least one local maximum of each of the first frequency spectrum and the second frequency spectrum occur at matching frequencies within the tolerance. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification