The operation instrument in order organization the stab to do demarcates the longitudinal axis, at the same time, outside possessing the peripheral wall, includes with the component and inside being arranged at least partly inside the outer part component, the component. The inside component includes the stab component which it adjoins to the distal (2036) edge of the outer part component. The stab component, in order organization the stab to do, has the abbreviation annular margin which conforms. The inside component and the outer part component, it conforms for relative longitudinal traverse with 1st and 2nd longitudinal direction position. At 1st position, as for the annular margin of the stab component, substantially, it is restrained inside the peripheral wall of the outer part component, at 2nd position, as for the annular margin, being exposed at least partly from the peripheral wall, it promotes the stab which passes by organization.組織を穿刺するための手術器具は、長手軸を画定し、かつ、外周壁を有する外側部材と、少なくとも部分的に外側部材内に配置される内側部材とを含む。内側部材は、外側部材の遠位端に隣接する穿刺部材を含む。穿刺部材は、組織を穿刺するように適合される略環状の周縁を有する。内側部材と外側部材とは、第1と第2の長手方向位置との間の相対的な長手方向移動のために適合される。第1の位置では、穿刺部材の環状の周縁は、実質的に、外側部材の外周壁内に拘束され、第2の位置では、環状の周縁は、少なくとも部分的に外周壁から露出されて、組織を通る穿刺を促進する。
