Interference recognition circuit in a heart pacemaker

Surgery – Truss – Pad

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A61N 100

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active

045165793

ABSTRACT:
A synchronizable heart pacemaker includes a timing circuit, a differentiating circuit for receiving signals, and an interference recognition circuit connected to the output of the differentiating circuit. The interference recognition circuit includes a testing stage for each signal. An output signal normally appears on an output of the testing stage, and the testing stage includes a peak detector circuit which stores a positive maximum value and a negative maximum value of each signal differentiated by the differentiating stage, and an adder forming the sum of said maximum values. A discriminator stage is postcoupled to the testing stage. The discriminator stage generates a time interval corresponding approximately to a time duration of the QRS-complex of a heart-action signal, and includes a checking circuit for checking the presence or absence of the output signal of the testing stage after said time interval, and a decision circuit for recognizing the output signal either as an interfering signal, and thereafter rendering the interfering signal ineffective, or recognizing the output signal as the heart-action signal, and passing the heart-action signal to the timing circuit.

REFERENCES:
patent: 3811428 (1974-05-01), Van Horn et al.
patent: 3881493 (1975-05-01), Cannon
patent: 3905364 (1975-09-01), Cudahy et al.
patent: 3927677 (1975-12-01), Gobeli et al.
patent: 3985142 (1976-10-01), Wickam
patent: 4478224 (1984-10-01), Bailey

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