Patent ID: 8335556

Claim:
A capsule medical device comprising: a bio-information detecting device configured to detect bio information of the inside of a body cavity; a magnet configured to generate a driving force by a guidance magnetic field applied from outside the body; a coil configured to receive a position-detection magnetic field applied from outside the body and to generate a position-detection signal; a filter device, connected to the coil, configured to attenuate an induction signal component due to the guidance magnetic field incident on the coil; and a wireless transmission device configured to externally transmit the position-detection signal which has passed through the filter device and the bio information which has been detected by the bio-information detecting device, wherein the coil comprises two or more coils, and opening directions of the coils differ, the opening directions of the two or more coils and a direction of a magnetic field formed by the magnet at the position of the coil are substantially orthogonal, and each of the two or more coils has a center axis that is substantially aligned with a longitudinal axis of the capsule medical device, and is disposed such that the opening directions are inclined with respect to the longitudinal axis of the capsule medical device.