Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1992-11-23
1994-09-27
Sykes, Angela D.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 11, A61N 1362
Patent
active
053504100
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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Buchanan Stuart W.
Kleks Jonathan A.
Mann Brian M.
Poore John W.
Wilson Raymond J.
Gold Bryant R.
Romano Malcolm J.
Schaetzle Kennedy J.
Siemens Pacesetter, Inc.
Sykes Angela D.
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