Noninvasive Motion and Respiration Monitoring System
First Claim
1. A method of non-invasively monitoring heart rate and respiration of a subject comprising the steps of:
- receiving a time-domain signal from a impulse-sensitive sensor array;
applying a Fast Fourier Transform function to the time-domain signal to convert to a frequency-domain signal;
filtering the frequency-domain signal through a first bandpass filter to provide a frequency-domain signal representing a first bio-indicator;
applying an inverse Fast Fourier Transform function to the frequency-domain first bio-indicator signal to provide a time-domain first bio-indicator signal.
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Abstract
A non-invasive motion and respiration monitor receives impulses from a subject'"'"'s movement, heartbeat, and respiration. The raw signal is biased and digitized, and a signal processor applies a Fast Fourier Transform to the signal. The transformed signal is filtered to isolate the component representing heart rate from the component representing respiration. An Inverse Fast Fourier Transform is then applied to the component signals, which are sent to a processor. The processor is programmed to detect irregularities in the respiration and heart rate. If severe irregularities or complete cessation is detected in either signal, a mechanical stimulator is actuated to try to stimulate the subject, and an alarm is sounded to alert a caregiver such as a parent or nurse.
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Citations
28 Claims
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1. A method of non-invasively monitoring heart rate and respiration of a subject comprising the steps of:
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receiving a time-domain signal from a impulse-sensitive sensor array; applying a Fast Fourier Transform function to the time-domain signal to convert to a frequency-domain signal; filtering the frequency-domain signal through a first bandpass filter to provide a frequency-domain signal representing a first bio-indicator; applying an inverse Fast Fourier Transform function to the frequency-domain first bio-indicator signal to provide a time-domain first bio-indicator signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A non-invasive monitoring system comprising:
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a sensor array comprising impulse-sensitive transducers, the sensor array disposed on a surface for holding a subject to be monitored and configured to provide a time-domain output waveform; a signal processor configured to receive the time-domain output waveform and to; apply a Fast Fourier Transform to the time-domain output waveform to provide a frequency-domain waveform; filter the frequency-domain waveform through a bandpass filter to provide a frequency-domain bio-indicator signal; apply an inverse Fast Fourier Transform to the frequency-domain bio-indicator signal to provide a time-domain bio-indicator signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification