Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1997-01-21
1998-04-21
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 29, A61N 139
Patent
active
057413070
ABSTRACT:
Improved methods of determining the recommended replacement time (RRT), and therefore extending the longevity, of implantable electronic medical devices, especially implantable cardioverter-defibrillators, pacemakers and similar devices, which rely on a battery having at least a minimal charge in order for the device to perform its intended function and devices employing these methods are described. In one embodiment, the improved method entails independent measurement of at least two different indicators of battery strength, at least one of which is affected by the battery's internal impedance. In a preferred embodiment, terminal battery voltage and capacitor charge time are independently monitored. If the terminal battery voltage falls below a predetermined minimum threshold or the capacitor charge time is confirmed to exceed a predetermined maximum charge time, an RRT signal is issued. In an alternative embodiment, an RRT signal is also issued by the medical device when one indicator of battery strength, for example, battery terminal voltage, falls below a predetermined intermediate voltage but is above the minimum threshold voltage and a second indicator of battery strength, for example, capacitor charge time, exceeds its predetermined maximum threshold.
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Evanisko George R.
Kamm William E.
Pacesetter Inc.
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