R-wave detector
First Claim
Patent Images
1. The method of detecting the R wave in an electrocardiographic waveform including P, Q, R, S, and T waves, comprising:
- reshaping said electrocardiographic waveform to provide wave components having shape characteristics predetermined in accordance with the shape characteristics of said electrocardiographic waveform so that only a reshaped wave component corresponding to said R wave has an amplitude greater than a predetermined level and a time duration greater than a predetermined period;
selecting reshaped wave components having an amplitude greater than said predetermined level and a time duration greater than said predetermined period; and
producing output pulses at the end of said predetermined period in response to said selected wave components, whereby said output pulses correspond to said R wave.
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Abstract
An electronic system is disclosed which examines the first derivative of an applied electrocardiographic (ECG) signal, recognizes the R-wave event therefrom, and discriminates against signal components which lie outside predetermined signal parameters in producing a rectangular pulse output. In addition, muscle artifact and pacers are discriminated against. The system includes an automatic gain control to eliminate the need for operator controls.
64 Citations
22 Claims
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1. The method of detecting the R wave in an electrocardiographic waveform including P, Q, R, S, and T waves, comprising:
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reshaping said electrocardiographic waveform to provide wave components having shape characteristics predetermined in accordance with the shape characteristics of said electrocardiographic waveform so that only a reshaped wave component corresponding to said R wave has an amplitude greater than a predetermined level and a time duration greater than a predetermined period; selecting reshaped wave components having an amplitude greater than said predetermined level and a time duration greater than said predetermined period; and producing output pulses at the end of said predetermined period in response to said selected wave components, whereby said output pulses correspond to said R wave. - View Dependent Claims (2, 3)
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4. An electronic system for detecting the R wave in an electrocardiographic waveform including P, Q, R, S, and T waves, comprising:
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means for reshaping said electrocardiographic waveform to provide wave components having shape characteristics determined in accordance with the shape characteristics of said electrocardiographic waveform so that only a reshaped wave component corresponding to said R wave has an amplitude greater than a predetermined level and a time duration greater than a predetermined period; and means for selecting reshaped wave components having an amplitude greater than said predetermined level and a time duration greater than said predetermined period. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electronic system for detecting the R wave in an electrocardiographic waveform including P, Q, R, S, and T waves, comprising:
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an input terminal for receiving said electrocardiographic waveform; means for reshaping said electrocardiographic waveform to provide wave components having shape characteristics determined in accordance with the shape characteristics of said electrocardiographic waveform so that only a reshaped wave component corresponding to said R wave has an amplitude greater than a predetermined level and a time duration greater than a predetermined period; an amplitude discriminator for rejecting reshaped wave components below a predetermined level and producing a signal having a time duration coincident with reshaped wave conponents above said predetermined level; and a time discriminator for rejecting signals from said first amplitude discriminator having a time duration shorter than a predetermined period and producing an output pulse responsive to a signal having a time duration longer than said predetermined period, whereby said output pulse corresponds to said R wave. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification