Patent ID: 9526523
Filing Date: 2016-12-27
CPC Classification: A61B

Claim Text:
1. An external fixation device for keeping a first bone portion and a second bone portion separated from each other in a joint, by attaching to a first pin which penetrates the first bone portion and to a second pin which penetrates the second bone portion, the device comprising: a first permanent magnet and a second permanent magnet which are opposed to each other, with their same poles facing each other; a first holding portion which is disposed on a surface of the first permanent magnet, on a side facing away from a surface opposing to the second permanent magnet, and is attached to the first pin; a second holding portion which is disposed on a surface of the second permanent magnet, on a side facing away from a surface opposing to the first permanent magnet, and is attached to the second pin; a pair of first limiter portions which allow movement of the first permanent magnet and the second permanent magnet in a first direction defined as a direction of their repulsion force by sandwiching the first permanent magnet and the second permanent magnet from a second direction defined as a direction perpendicular to the first direction, and limit movement thereof in the second direction; a second limiter portion disposed to connect the pair of first limiter portions to each other to limit movement of the first permanent magnet and the second permanent magnet in a third direction defined as a direction perpendicular to both of the first direction and the second direction; a first platy member provided between one of the first limiter portions and the first and second permanent magnets; and a second platy member provided between the other of the second limiter portions and the first and second permanent magnets; wherein the second limiter portion includes a second platy portion, and a first platy portion provided between the second platy portion and the first and second permanent magnets; each of the first limiter portions and the second platy portion is magnetic; and each of the first platy member, the second platy member and the first platy portion is nonmagnetic.