US Patent 9715327 Preventing inadvertent changes in ambulatory medical devices

A portable medical device is operated in an active mode in which the device receives a user input at an input interlace and provides the received user input to a processor of the device. The active mode is terminated and the device is operated in a safe mode, in which the received user input is not provided to the processor and/or one or more device function is disabled, in response to determining that the received user input was received in an out of bounds region of the input interface. The safe mode is terminated in response to receiving a predetermined user input comprising an activation input.