Pacer with automatically variable A-V interval

Details Pacer with automatically variable A-V interval Pacer with automatically variable A-V interval

1976-11-03

1978-08-22

Kamm, William E.

Surgery

Truss

Pad

A61W 136

Patent

active

041081480

ABSTRACT:
An improved atrial synchronous heart pacer includes means for generating an atrio-ventricular (A-V) interval control signal of automatically variable duration, which duration is a function of the sensed atrial heart rate (i.e. P-wave rate). A timing circuit establishes a basic timing interval for the generation of ventricular stimulation pulses, which interval may be modified by the control of the A-V interval signal. The A-V interval control signal preferably comprises the output of a P-wave triggered monostable multivibrator. The time constants of the multivibrator's timing circuits are scaled such that operation within the heart-rate range of 55-150 beats per minute prevents full recovery of the multivibrator following each sensed atrial beat and generation of an A-V output pulse, resulting in an A-V output pulse whose duration is a function of the time since the preceding trigger (i.e. rate).
By appropriately coupling the variable duration A-V interval pulse to the ventricular stimulation pulse timing circuitry, it is possible to adjust the threshold voltage of a relaxation oscillator such that the ventricular stimulation pulse is generated at the end of an A-V delay following a sensed P-wave, the interval of the A-V delay being variable and dependent on the P-wave rate.

REFERENCES:
patent: 3253596 (1966-05-01), Keller, Jr.
patent: 3433228 (1969-03-01), Keller, Jr.
patent: 3648707 (1972-03-01), Greatbatch
patent: 3783878 (1974-01-01), Thaler et al.
patent: 3794045 (1974-02-01), Thaler
patent: 3807410 (1974-04-01), Wall et al.
patent: 3903897 (1975-09-01), Woollows et al.
Fischler et al. "IEEE Transactions on Biomedical Engineering" vol. BME 16, #1, Jan., 1969, pp. 64-68.

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