Patent ID: 8781571
Filing Date: 2014-07-15
Classification: A61M,A61N

Abstract:
1. A switch operated medical device, comprising: a use-actuated device switch configured to be actuated by a user, which provides a switch signal to a switch input of a device controller when actuated by a user; the device controller configured to actuate the device after the user presses the device switch at least two times within a predetermined interval, the device controller further having said switch input operatively connected to the device switch, and configured to receive the switch signal from the device switch, the device controller being configured to actuate the device after a second push of the device switch when the switch signal meets certain predetermined conditions; and a switch integrity test sub circuit, which is configured to detect a fault or a precursor to a fault in the device switch by determining an evoked response at the switch input after release of the device switch but before the second push of the device switch, when the controller sets the switch input to one or more predetermined voltages to evoke a response, and comparing the evoked response to one or more expected values, and causing the controller to execute a switch fault subroutine when a fault or a precursor to a fault is detected.