Fusion device and tool set for fusing a human or animal joint

摘要

The fusion device for fusing a synovial joint of a human or animal patient, in particular a human facet joint, finger joint or toe joint, comprises two pin-shaped anchorage portions and arranged therebetween a stabilization portion. The anchorage 5 portions comprise a thermoplastic material which is liquefiable by mechanical vibration. The stabilization portion preferably has a surface which is equipped for enhancing osseointegration. The anchorage portions have a greater thickness and a greater depth than the stabilization portion. For implanting the fusion device, grooves are provided in the articular surfaces of the joint to be fused, two opposite grooves 10 forming together an opening for accommodating one of the anchorage portions. Then the fusion device is pushed between the articular surfaces and mechanical vibration, in particular ultrasonic vibration, is applied to the proximal face of the fusion device. Thereby the liquefiable material is liquefied where in contact with the bone tissue and penetrates into the bone tissue, where after re-solidification it constitutes a 15 positive fit connection between the fusion device and the bone tissue. 7158122_1 (GHMatters) P86849.AU.1 NIOUSHAA fixation step fixing articular surfaces relative to each other preparation step preparing articular surfaces implantation step positioning and anchoring fusion device finishing step releasing fixation of articular surfaces Fig. 3