Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1994-05-09
1995-05-23
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 27, A61N 137
Patent
active
054177189
ABSTRACT:
An autocapture system within an implantable pulse generator automatically maintains the energy of a stimulation pulse at a level just above that which is needed to effectuate capture. The electrical post-stimulus signal of the heart following delivery of a stimulation pulse is compared to a polarization template, determined during a capture verification test. A prescribed difference between the polarization template and the post-stimulus signal indicates capture has occurred. Otherwise, loss of capture is presumed, and a loss-of-capture routine is invoked that increases the energy a prescribed amount to obtain capture. Periodically, and/or at programmed intervals or events, the capture verification test is performed. During the capture verification test, the pulse generator determines a polarization template for a particular stimulation energy and for each of a plurality of sensitivity or threshold settings. A determination is also made as to which sensitivity settings yield capture. An autocapture routine extends the capture verification test data to a wide range of stimulation energies. An autothreshold routine automatically sets the energy of the stimulation pulse a specified level above the energy at which capture is first lost.
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Feld, Gregory M.D., et al., "A New Pacemaker Algorithm for Automatic Threshold Determination and Capture Verification," Pace, vol. 14, p. 728: NASPE Abstracts (Apr. 1991, Part II.
Curtis, Anne B. M.D. et al., "A New Algorithm for Minimizing Pacemakier Polarization Artifact that is Universally Applicable in Permanent Pacing Systems," Pace, vol. 14, pp. 728; NASPE Abstracts (Apr. 1991, Part II.
Buchanan Stuart W.
Kleks Jonathan A.
Mann Brian M.
Poore John W.
Wilson Raymond J.
Kamm William E.
Pacesetter Inc.
Schaetzle Kennedy J.
Weinberg Lisa P.
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