Patent ID: 8257248

Claim:
A body-insertable apparatus that performs a predetermined function inside the body of the subject, comprising: a function executing unit that performs the predetermined function; an energy supply source that supplies with energy to be used to drive the function executing unit; an external-signal detecting unit that detects an external control signal input from outside the body-insertable apparatus, and that generates a control signal based on a detection state of the external control signal; a switch that controls supply of the energy to the function executing unit from the energy supply source; and an energy supply control unit that causes the switch to toggle in accordance with the control signal from the external-signal detecting unit, wherein the energy supply control unit includes a state maintaining unit that maintains the detection state of the external control signal detected by the external-signal detecting unit, and the state maintaining unit includes: an output control circuit that generates a reverse signal obtained by reversing the control signal output from between the external-signal detecting unit and a ground, and that outputs a re-reverse signal obtained by further reversing the reverse signal to the switch; a first control circuit including a capacitor that is arranged between the energy supply source and the external-signal detecting unit, and a first switch that is connected to the capacitor in parallel and that is turned off and on based on the re-reverse signal indicating on and off respectively; and a second control circuit including a resistor that is arranged between an output end of the external-signal detecting unit and a ground, and a second switch connected in series on a side of the ground and that is turned on and off based on the reverse signal indicating on and off respectively.