Patent Number: 6,169,921

Title: Autocapture determination for an implantable cardioverter defibrillator

Abstract: A cardiac pacing/defibrillation system that enhances the ability of a cardiac pacer to automatically detect whether a pacing stimulus results in heart capture or contraction. The cardiac pacing/defibrillation system includes a pacing circuit that attenuates polarization voltages or "afterpotential" which develop at the heart tissue/electrode interface following the delivery of a stimulus to the heart tissue, which thereby allows the pacing electrodes to be utilized to sense an evoked response to the pacing stimulus. The cardiac pacing/defibrillation system may utilize the ventricular coil electrode and superior vena cava coil electrode to sense an evoked response, thereby eliminating the necessity for an additional ventricular lead for sensing an evoked response. The present invention allows accurate detection of an evoked response of the heart, to thereby determine whether each pacing stimulus results in capture.

Inventors: KenKnight; Bruce H. (Maple Grove, MN), Zhang; Geng (Vadnais Heights, MN), Zhu; Qingsheng (Little Canada, MN)

Assignee: Cardiac Pacemakers, Inc.

International Classification: A61N 1/362 (20060101); A61N 1/37 (20060101); A61N 001/362 ()

Expiration Date: 01/02/2018