Method for matching the sense length of an impedance measuring c

Details Method for matching the sense length of an impedance measuring c Method for matching the sense length of an impedance measuring c

1989-02-13

1990-03-27

Cohen, Lee S.

Surgery

Truss

Pad

128694, 128734, A61B 502

Patent

active

049111744

ABSTRACT:
A method for matching the distance spanned by a plurality of surface electrodes on an impedance measuring catheter to the size of a ventricular chamber to be measured is disclosed. The catheter includes a plurality of longitudinally spaced electrodes extending from its distal end and spanning a distance known to be greater than the maximum length of a ventricular chamber. With the distal end of the catheter located at the apex of the ventricle, an AC drive signal is applied between the distal electrode and a proximal electrode known to be outside of the ventricle. By then sensing the resulting voltage between successive adjacent electrode pairs and comparing same, the pair where a different characteristic is exhibited is known to be at the transition between the ventricle and the atrium.

REFERENCES:
patent: 3942536 (1976-03-01), Mirowski et al.
patent: 4291699 (1981-09-01), Geddes et al.
patent: 4380237 (1983-04-01), Newbower
patent: 4587975 (1986-05-01), Salo et al.
patent: 4674518 (1987-06-01), Salo
patent: 4840182 (1989-06-01), Carlson

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