Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1995-05-22
1997-10-07
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 28, A61N 1365
Patent
active
056742541
ABSTRACT:
A implantable cardiac pacemaker system which is battery powered, having an improved capability for monitoring patient threshold and adjusting pace pulse output to an optimized safety factor above patient threshold, thereby avoiding excessive energy expenditure in delivery of pace pulses and maximizing pacemaker lifetime. The improved threshold tracking system analyzes information from detected heart signals and correlates changes in such heart signal information to pulse output energy, enabling a determination of when the pulse output energy is near threshold without dropping below threshold. In a preferred embodiment, changes in the QT interval are monitored and correlated with changes in output pulse energy, enabling the pacemaker to obtain a measure of patient threshold without dropping pulse energy below threshold and suffering loss of capture.
REFERENCES:
patent: 5391192 (1995-02-01), Lu et al.
patent: 5411533 (1995-05-01), Dubreuil et al.
patent: 5417718 (1995-05-01), Kleks et al.
patent: 5476487 (1995-12-01), Sholder
Kamm William E.
Schaetzle Kennedy J.
Vitatron Medical B.V.
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