PROBLEM TO BE SOLVED: To provide a medical device, after injection of a medical solution into a body cavity wall, capable of quickly transferring to injection work at a next part, thus reducing troublesomeness of the work and shortening a treatment time.SOLUTION: A medical device 1 includes: a needle 3 having an inner hole 3a penetratingly formed from a distal end to a proximal end along the longitudinal direction； a liquid solution supply part 4 connected to the proximal end of the needle 3 and supplying the inner hole 3a with the medical solution A that is hardened by heating or cooling； a temperature changeable member 5 that is provided at the distal end of the needle 3 or adjacent to the distal end and can be heated or cooled by supply of energy； and temperature adjusting means 6 that is provided at the proximal side of the needle 3 and supplies the temperature changeable member 5 with energy to heat or cool the temperature changeable member 5.【課題】薬液を体腔壁内に注入後、速やかに次の箇所での注入作業に移ることができ、作業の煩わしさを軽減して治療時間の短縮を図る。【解決手段】先端から基端まで長手方向に沿って貫通形成された内孔３ａを有する針３と、該針３の基端に接続され、加温または冷却されることによって硬化する薬液Ａを内孔３ａ内へ供給する薬液供給部４と、針３の先端または先端近傍に設けられ、エネルギの供給によって加温または冷却可能な変温部材５と、針３の基端側に設けられ、変温部材５にエネルギを供給して変温部材５を加温または冷却する温度調整手段６とを備える医療用デバイス１を提供する。【選択図】図１
