Respiration-controlled cardiac pacemaker

Details Respiration-controlled cardiac pacemaker Respiration-controlled cardiac pacemaker

1985-07-24

1988-01-26

Kamm, William E.

Surgery

Truss

Pad

A61N 136

Patent

active

047211105

ABSTRACT:
The respiration-controlled cardiac pacemaker includes a stimulation pulse generator (3) generating stimulating pulses at a controllable basic stimulation rate, a rheography pulse generator (17) producing rheography pulses of constant amplitude and a respiration detector (21) which, as a function of the impedance data of the rheography pulses, generates a respiration signal representing the respiratory rate and/or the depth of respiration. Control device (11) control the basic stimulation rate of the stimulation pulse generator (3) in accordance with a predetermined respiration signal--basic stimulation rate--characteristic as a function of the respiration signal. The rheography pulse generator (17) generates the rheography pulses to a timing dependent upon the stimulating pulses and/or inhibiting pulses, preferably within the refractory time intervals in each case associated with the individual stimulating pulses or inhibiting pulses and in which the stimulation pulse generator is blocked. It is convenient that the rheography pulses are generated within the refractory time intervals preceding the individual stimulating pulses. Associated with each stimulting pulse or inhibiting pulse is a single rheography pulse. In this way, stimulation upsets and disturbances of the ECG by the rheography pulses are avoided and in the event of hyperventilation, any undesired rise in basic stimulation rate is avoided.

REFERENCES:
patent: 3593718 (1971-07-01), Krasner et al.
patent: 4567892 (1986-02-01), Plicchi et al.

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