Patent ID: 8583954

Claim:
A medical device comprising: a switch circuit comprising a source terminal, a drain terminal, and a gate terminal, wherein the source terminal is coupled to a power source; a switch circuit controller coupled directly to the drain terminal and the gate terminal of the switch circuit and configured to: monitor a voltage at the drain terminal of the switch circuit, and output a voltage to the gate terminal of the switch circuit to transition the switch circuit from a closed state to an open state when the voltage at the drain terminal of the switch circuit is less than a predetermined voltage threshold; and a switch state selector comprising: a sense resistor coupled to the power source and the source terminal of the switch circuit; and a current comparator configured to monitor a voltage across the sense resistor to monitor a current delivered by the power source, and transmit a command to the switch circuit controller instructing the switch circuit controller to output the voltage to the gate terminal of the switch circuit to transition the switch circuit from the closed state to the open state when the voltage across the sense resistor is greater than an offset.