Patent ID: 7419468

Claim:
A wireless in-vivo-information acquiring system comprising: a body-insertable device adapted to be inserted into a body of a patient, the body insertable device being a pill-type apparatus movable within internal organs of the body to acquire in-vivo information; and an external device that is disposed outside of the body of the patient, wherein the external device includes a first power-supply signal transmitting unit that transmits a power-supply signal from a power source to the body-insertable device with a first magnetic field of one predetermined directivity; a second power-supply signal transmitting unit that transmits the power-supply signal from the power source to the body-insertable device with a second magnetic field of other predetermined directivity, and a power-supply control unit that selects one of the first and second power-supply signal transmitting units, the body-insertable device includes a reception strength determining unit that determines strength of a power-supply signal based on a result of comparison between a value of electric power recovered from the power-supply signal and a preset value, and outputs a determination result signal; a determination result transmitting unit that modulates the determination result signal, and wirelessly transmits the determination result signal modulated to outside of the body-insertable device; and a processor configured to control the reception strength determining unit to determine the strength of the power-supply signal based on the result of comparison between the value of electric power recovered from the power-supply signal and the preset value and output the determination result signal and control the determination result transmitting unit to modulate the determination result signal and wirelessly transmit the determination result signal modulated to outside of the body-insertable device; wherein the processor further controls the power-supply control unit to select one of the first and second power-supply signal transmitting units based on the determination result signal.