Cardiac pacer having stimulation threshold measurement circuit

Details Cardiac pacer having stimulation threshold measurement circuit Cardiac pacer having stimulation threshold measurement circuit

1984-12-28

1986-04-29

Kamm, William E.

Surgery

Truss

Pad

128419PT, A61N 136

Patent

active

045850062

ABSTRACT:
An external pacer having a plurality of user-selectable output current levels includes a user-actuable push button switch for reducing the selected output current level by a factor of 10. By observing the absence or presence of an R-wave while operating at the reduced current level the stimulation threshold level of the heart can be determined without the need for additional level selections, and without subjecting the heart to sustained periods of low current. In the illustrated embodiment of the invention for typical output current levels of 2-20 milliamperes threshold levels of 0.2-2.0 milliamperes are obtained.

REFERENCES:
patent: 3198195 (1965-08-01), Chardack
patent: 3311111 (1967-03-01), Bowers
patent: 3638656 (1972-02-01), Grandjean et al.
patent: 3757790 (1973-09-01), Herrman
patent: 3777762 (1973-12-01), Nielsen
patent: 3800801 (1974-04-01), Gaillard
patent: 3837348 (1974-09-01), Thaler
patent: 3945387 (1976-03-01), Adams
patent: 4024875 (1979-05-01), Putzke
patent: 4030510 (1977-06-01), Bowers
patent: 4387718 (1983-06-01), Bilitz et al.

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