Micro invasive medical devices have being show great potency in clinical application. But the localization problem hasn’t been settled still, restraining development of the micro invasive devices. Aiming at positioning the gastrointestinal physiological parameters detecting capsule, the paper puts forward a portable AC electromagnetic localization method for micro gastrointestinal invasive diagnosing devices. Firstly, we build up the quasi-static magnetic field model of a coil to calculate magnetic flux density, and solutes the positioning equations based on the simulated annealing algorithm. Finally from the experiment’s results, the accuracy of portable positioning system is less than 10mm, which can satisfy the localization need of the micro invasive devices in vivo.
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