PROBLEM TO BE SOLVED: To provide a fusion device for fusing a human or animal synovial joint, achieving the stability of the device immediately after implantation, as well as enabling bone growth after implantation.SOLUTION: The fusion device comprises two pin-shaped anchorage portions 1 and a stabilization portion 2 arranged therebetween. The anchorage portions comprise a thermoplastic material which is liquefiable by mechanical vibration. The stabilization portion preferably has a surface which is equipped with a function for enhancing osseointegration. The anchorage portions have a greater thickness and a greater depth D than those of the stabilization portion. For implanting the fusion device, grooves are provided in the articular surfaces of the joint to be fused, and two opposite grooves form 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 a proximal face 4 of the fusion device. Thereby the liquefiable material is liquefied in a position where it is in contact with bone tissue and penetrates into the bone tissue, and after re-solidification it constitutes a positive fit connection between the fusion device and the bone tissue.SELECTED DRAWING: Figure 1A【課題】移植直後の装置の安定性および、移植後に骨を成長させることができるヒトまたは動物の滑膜関節を融合させるための融合装置を提供する。【解決手段】融合装置は、ピン形状の２つの固定部分１とその間に配置された安定化部分２とを含む。固定部分は機械的振動によって液化可能な熱可塑性材料を含む。安定化部分は好ましくは骨結合を強化する機能を備えた表面を有する。固定部分の厚みおよび深さＤは安定化部分よりも大きい。融合装置を移植するために、融合させる関節の関節面に溝を設け、２つの対向する溝が合わさって固定部分のうち一方を収容するための開口を形成する。次に、融合装置を関節面の間に押込み、機械的振動、特に超音波振動を融合装置の近位面４に与える。これにより、液化可能な材料は、骨組織と接触する場所で液化して骨組織に浸透し、再度凝固した後、融合装置と骨組織との間に押込嵌合接続を構成する。【選択図】図１Ａ
