Watchdog timer for automated external defibrillator

Details Watchdog timer for automated external defibrillator Watchdog timer for automated external defibrillator

1997-11-26

1999-07-06

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 139

Patent

active

059192127

ABSTRACT:
An automated external defibrillator automatically performs periodic self-tests on a daily and weekly basis. Self-test failures are identified by a watchdog timer which is reset upon activation of each periodic self-test. If the watchdog timer times out a maintenance indication is activated. The timeout period of the watchdog timer is non-repeating and non-periodic (typically 30 hrs.). Tested functions include the presence and interconnection of defibrillator electrodes, battery charge state, and the operability of the high voltage circuit. Visual and audible indicators are actuated to alert an operator if faults are identified. A record of each self-test is stored in memory, and can be subsequently retrieved through a communications port.

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