MRI COMPATIBLE MAGNET FOR COCHLEAR IMPLANT

The present invention discloses an MRI compatible magnet for a cochlear implant, comprising a base, an upper shell, a bracket, a magnet, needle rollers and a lower shell, wherein the upper shell and the lower shell form a closed space, and the magnet and the bracket are arranged in the closed space; the magnet is in an axisymmetric polygonal disk shape; the magnetic pole of the magnet is divided into two halves from the top view, one half is an N pole, and the other half is an S pole; the magnet is arranged in the bracket; the bracket is matched with the magnet in shape, and the bracket rotates with the magnet when the magnet rotates axially; a plurality of positioning slots are provided on the outer side face of the bracket; and , the needle rollers are accommodated in the positioning slots, and the needle rollers are cylindrical and can axially roll in the positioning slots without slipping off. The MRI compatible magnet for a cochlear implant provided by the present invention can flexibly rotate on the bracket according to the change of the direction of an external magnetic field, so that the N pole and the S pole of the magnet can be freely switched in the spatial direction, and it is unnecessary to take out the cochlear implant and the internal magnet during examinations in a strong magnetic field such as MRI.