Patent ID: 8366710

Claim:
An external fixator comprising: a plurality of pins to be inserted into bones; a coupling member, at least of a portion of which is configured as a cylindrical coupling part; and a plurality of ball joints that fix the coupling member to the pins and are connected to each other by the coupling member, the plurality of ball joints each including: a rotary member that is a ball; a supporting member where a first thread and a first supporting portion that rotatably supports the ball are formed; and a fastening member which has a tubular shape, has openings at both end portions thereof, and receives the ball, the fastening member at one end portion of which is formed a second thread corresponding to the first thread and at the other end portion of which is formed a second supporting portion that presses the ball against the first supporting portion by screwing the second thread to the first thread, wherein the pin is fixed to the rotary member while being inserted into a hole formed at the rotary member, and the coupling member is fixed to the supporting member with the coupling part being inserted into the supporting member, and the rotary member and/or the supporting member is formed of a plastic magnet.