Ring-to-ring cardiac electrogram pacemaker

Details Ring-to-ring cardiac electrogram pacemaker Ring-to-ring cardiac electrogram pacemaker

1992-07-13

1993-11-30

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

128786, 128419P, A61N 1368

Patent

active

052656020

ABSTRACT:
A pacemaker having two bipolar leads, one atrial, one ventricular, each with TIP and RING electrodes, configured as for conventional bipolar pacing/sensing in both chambers. Switching circuitry in the pacemaker is operable to select from among various possible sensing configurations, including one configuration in which sensing is performed between the ring electrodes of the respective pacing/sensing leads. Pacing is preferably performed in a conventional unipolar configuration in each chamber, from the respective tip electrodes. The "ring-to-ring" EGM signal is applied to filtering and EGM amplifier circuitry, and then provided to a telemetry system for transmission to an external receiver. The ring-to-ring EGM signal possesses the high resolution properties of conventional intracardiac signals, and is relatively unaffected by the after-potentials and tissue polarization effects that arise when the same lead is used for pacing and sensing. Additionally, the ring-to-ring EGM signal is a composite of atrial and ventricular electrical signals, and thus has an appearance similar to that of surface ECGs.

REFERENCES:
patent: 4387717 (1983-06-01), Brownlee et al.
patent: 4556063 (1985-12-01), Thompson et al.
patent: 4579119 (1986-04-01), Callaghan
patent: 4585004 (1986-04-01), Brownlee
patent: 4913146 (1990-04-01), DeCote, Jr.
patent: 4955376 (1990-09-01), Callaghan et al.
patent: 5154171 (1992-10-01), Chirife

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