Patent ID: 8465418

Claim:
A capsule-type medical device comprising: a capsule-type in-vivo device including an antenna, the capsule-type in-vivo device being inserted into a living body; a wireless transmission section for transmitting wirelessly an electromagnetic wave signal from the antenna in the capsule-type in-vivo device; a plurality of extracorporeal antennae arranged outside the living body; an estimation section for estimating a position of the antenna or the capsule-type in-vivo device from the electromagnetic wave signal at a time when the electromagnetic wave signal was received by the plurality of extracorporeal antennae; and a track calculating section for calculating a track of movement of the capsule-type in-vivo device according to a condition set for the case where a plurality of positions at mutually different times have been estimated by the estimation section; wherein the track calculating section defines an evaluation function for two temporally adjacent estimated positions, the evaluation function including information on a distance between the two positions and estimation information obtained when the two positions are estimated, and calculates the track, employing a value according to the evaluation function being equal to or lower than a predetermined value, as the condition.