Reducing data acquisition, power and processing for hemodynamic signal sampling
First Claim
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1. A computer readable medium comprising computer executable instructions that when executed by a processor cause the processor to:
- (a) in response to detecting a specific event associated with a cyclical body function, continuously sample a hemodynamic signal during a window following the detecting of the specific event, to thereby produce a plurality of samples, wherein the window is shorter than a cycle associated with the cyclical body function;
(b) repeat step (a) a plurality of times such that a plurality of samples is produced for each of a plurality of said windows;
(c) analyze the hemodynamic signal based on the plurality of samples, wherein said analyzing step comprises averaging the plurality of samples produced for each of the plurality of said windows to thereby produce an average value for each of said windows; and
(d) determine a peak-to-peak amplitude based on the plurality of samples.
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Abstract
Methods, systems and devices are provided for reducing the amount of data, processing and/or power required to analyze hemodynamic signals such as photoplethysmography (PPG) signals, pressure signals, and impedance signals. In response to detecting a specific event associated with a cyclical body function, a hemodynamic signal is continuously sampled during a window following the detecting of the specific event, wherein the window is shorter than a cycle associated with the cyclical body function. The hemodynamic signal is then analyzed based on the plurality of samples.
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Citations
47 Claims
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1. A computer readable medium comprising computer executable instructions that when executed by a processor cause the processor to:
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(a) in response to detecting a specific event associated with a cyclical body function, continuously sample a hemodynamic signal during a window following the detecting of the specific event, to thereby produce a plurality of samples, wherein the window is shorter than a cycle associated with the cyclical body function; (b) repeat step (a) a plurality of times such that a plurality of samples is produced for each of a plurality of said windows; (c) analyze the hemodynamic signal based on the plurality of samples, wherein said analyzing step comprises averaging the plurality of samples produced for each of the plurality of said windows to thereby produce an average value for each of said windows; and (d) determine a peak-to-peak amplitude based on the plurality of samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for reducing the amount of data required to analyze a hemodynamic signal, comprising:
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a sampler configured to continuously sample the hemodynamic signal during a window following a detection of a specific event associated with a cyclical body function, to thereby produce a plurality of samples, wherein the window is shorter than a cycle associated with the cyclical body function; and a processor configured to analyze the hemodynamic signal based on the plurality of samples wherein the processor averages the plurality of samples produced for the window to thereby produce an average value for the window, wherein the processor determines a peak-to-peak amplitude based on the plurality of samples. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An implantable cardiac stimulation device comprising:
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a sensor configured to produce a hemodynamic signal, wherein the sensor is a PPG sensor; a sampler configured to continuously sample the hemodynamic signal during a window following a detection of a specific event associated with a cyclical body function, to thereby produce a plurality of samples, wherein the window is shorter than a cycle associated with the cyclical body function; and a processor configured to analyze the hemodynamic signal based on the plurality of samples, wherein the processor averages the plurality of samples produced for the window to thereby produce an average value for the window. - View Dependent Claims (30, 31, 32, 33)
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34. An implantable cardiac stimulation device comprising:
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a sensor configured to produce a hemodynamic signal; a sampler configured to continuously sample the hemodynamic signal during a window following a detection of a specific event associated with a cyclical body function, to thereby produce a plurality of samples, wherein the window is shorter than a cycle associated with the cyclical body function; and a processor configured to; analyze the hemodynamic signal based on the plurality of samples, wherein the processor averages the plurality of samples produced for the window to thereby produce an average value for the window; and determine a peak-to-peak amplitude based on the plurality of samples. - View Dependent Claims (35, 36, 37, 38, 39)
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40. A system for reducing the amount of data required to analyze a hemodynamic signal, comprising:
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a sampler configured to continuously sample the hemodynamic signal during a window following a detection of a specific event associated with a cyclical body function, to thereby produce a plurality of samples, wherein the window is shorter than a cycle associated with the cyclical body function; a processor configured to analyze the hemodynamic signal based on the plurality of samples wherein the processor averages the plurality of samples produced for the window to thereby produce an average value for the window, wherein the hemodynamic signal comprises a photoplethysmography (PPG) signal; and a light source and a light detector to produce the PPG signal, wherein the cyclical body function is heart beat, and wherein the cycle associated with the cyclical body function comprises a cardiac cycle. - View Dependent Claims (41, 42, 43)
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44. A system for reducing the amount of data required to analyze a hemodynamic signal, comprising:
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one or more sensors configured to produce one or more hemodynamic signals, wherein the hemodynamic signals comprise at least a photoplethysmography (PPG) signal; a light source and a light detector to produce the PPG signal; and a computer readable medium comprising computer executable instructions that when executed by a processor cause the processor to; (a) in response to detecting a specific event associated with a cyclical body function, continuously sample the one or more hemodynamic signals during a window following the detecting of the specific event, to thereby produce a plurality of samples, wherein the window is shorter than a cycle associated with the cyclical body function; (b) repeat step (a) a plurality of times such that a plurality of samples is produced for each of a plurality of said windows; and (c) analyze the one or more hemodynamic signals based on the plurality of samples, wherein said analyzing step comprises averaging the plurality of samples produced for each of the plurality of said windows to thereby produce an average value for each of said windows, wherein the cyclical body function is heart beat, and wherein the cycle associated with the cyclical body function comprises a cardiac cycle. - View Dependent Claims (45, 46, 47)
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Specification