As for this invention, is inserted being the insertion instrument for the internal professional thesis which has the chamber body (10) which to the neck (14) and the medullary cavity, the retention fork piece (25) and the battening arrangement (20) which has the opposition backing (26) and you ram down and include the device (3), the battening arrangement (20), tightens and restrains internal professional thesis (1) in state, tightens and in order to release internal professional thesis (1) in cancellation state, regards those which are constituted. Being secure, in order to insert position accurately simply, according to this invention, you ram down to the battening arrangement (20) and the guide track (23) for the element is provided fixed, the passage which is stipulated at the same time by the guide track, in order the internal professional thesis which in the battening arrangement (20) is kept (1) to lead to the end face, is directed.本発明は、頸部(14)及び髄腔へ挿入される胴部(10)を持つ体内プロテーゼ用の挿入器具であって、保持二又片(25)及び対向支持体(26)を持つ締付け装置(20)及び打込み装置(3)を含み、締付け装置(20)が、締付け状態において体内プロテーゼ(1)を拘束し、締付け解除状態で体内プロテーゼ(1)を釈放するように構成されているものに関する。確実で位置の正確な挿入を簡単に行うため本発明によれば、締付け装置(20)に打込み素子用案内軌道(23)が固定的に設けられ、かつ案内軌道により規定される通路が締付け装置(20)に保持される体内プロテーゼ(1)の端面へ通じるように向けられている。