Automatic pulse rate trigger-source select circuit
First Claim
1. An automatic pulse rate trigger-source select circuit, for selecting between trigger pulses corresponding to an ECG heart rate signal source and trigger pulses corresponding to a pressure/pulse heart rate signal source, and for providing the selected trigger pulses as an output signal, comprising:
- input means having inputs for being coupled to said original sources for generating said respective trigger pulses;
comparison circuit means, coupled to receive said trigger pulses from said input means, for comparing successive periods between trigger pulses for both of said sources to determine which of said sources is most accurately periodic, wherein said comparison circuit means provides an output instruction signal in correspondence with the said most periodic source, and wherein said comparison circuit means comprises a microprocessor programmed to provide a pair of timer functions for respectively counting up during a first of two successive heart beat periods for each of said sources, and for counting down during the second of said successive periods, and programmed to compare the final counts of said timer functions at the completion of said respective second periods; and
selecting circuit means, coupled to receive said trigger pulses from said input means, and coupled to receive said instruction signal from said comparison circuit means for selecting the trigger pulse corresponding to one of said sources of heart beat signals in response to said output instruction signal, and for providing the selected trigger pulses as an output signal corresponding to the selected source;
wherein said trigger pulses provided as an output signal are selected automatically in correspondence with the most periodic of said sources.
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Accused Products
Abstract
Disclosed herein is a circuit for automatically selecting between an ECG heartbeat signal source and a pressure/pulse signal source depending on which of the two sources is the most periodic between three successive heart beats. A pair of microprocessor internal timers commence a count-up cycle in response to a first detected heart beat from each of the two respective sources, after which count-down cycles are started in response to the next successive detected heart beats. The counting of the timers is then stopped in response to the third successive detected heart beats from the two sources and a comparison is provided to determine which of the two sources is most periodic, and should be used to trigger a heart rate monitor.
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Citations
4 Claims
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1. An automatic pulse rate trigger-source select circuit, for selecting between trigger pulses corresponding to an ECG heart rate signal source and trigger pulses corresponding to a pressure/pulse heart rate signal source, and for providing the selected trigger pulses as an output signal, comprising:
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input means having inputs for being coupled to said original sources for generating said respective trigger pulses; comparison circuit means, coupled to receive said trigger pulses from said input means, for comparing successive periods between trigger pulses for both of said sources to determine which of said sources is most accurately periodic, wherein said comparison circuit means provides an output instruction signal in correspondence with the said most periodic source, and wherein said comparison circuit means comprises a microprocessor programmed to provide a pair of timer functions for respectively counting up during a first of two successive heart beat periods for each of said sources, and for counting down during the second of said successive periods, and programmed to compare the final counts of said timer functions at the completion of said respective second periods; and selecting circuit means, coupled to receive said trigger pulses from said input means, and coupled to receive said instruction signal from said comparison circuit means for selecting the trigger pulse corresponding to one of said sources of heart beat signals in response to said output instruction signal, and for providing the selected trigger pulses as an output signal corresponding to the selected source; wherein said trigger pulses provided as an output signal are selected automatically in correspondence with the most periodic of said sources. - View Dependent Claims (2, 3, 4)
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Specification