PROBLEM TO BE SOLVED: To provide an attachment and detachment mechanism that is a mechanism for attachment and detachment of an insertion member and a jacket member, and that can reliably fix both members in a twist direction (a rotation direction) and a drawing-out direction.SOLUTION: The attachment and detachment mechanism for attachably and detachably fixing an operation tool 2 and the jacket member 4 includes an engagement member 2-1 including: drawing-out direction engagement surfaces 2-1s for restricting the movement of the operation tool 2 in the drawing-out direction, the operation tool 2 having been inserted into the jacket member 4 and twist direction engagement surfaces 2-1r for restricting the movement of the operation tool 2 in the rotating direction, the operation tool 2 having been inserted into the jacket member 4.COPYRIGHT: (C)2012,JPO&INPIT【課題】内挿部材と外套部材との着脱機構であって、捻り方向(回転方向)と引き抜き方向とについて確実に固定することが可能な着脱機構及び術具システムを提供すること。【解決手段】術具2と外套部材4とを着脱可能に固定する着脱機構を次のように構成する。すなわち、前記外套部材4に挿入された前記術具2の引き抜き方向への移動を規制する引き抜き方向係合面2-1sと、前記外套部材4に挿入された前記術具2の回転方向への移動を規制する捻り方向係合面2-1rと、を備える係合部材2-1を、前記着脱機構に具備させる。【選択図】図1
