And wherein the second component which is connected a first component having a first surface (76) and (2), the first component (2) to (4), a surgical instrument, the first and the second component (2,4), can be rotated relative to each other. The instrument further includes a locking mechanism including (32) a third component having a second surface coupled second component in (4) and (74). By engaging or disengaging and (76) the first surface faces the second (74), movement (32) a third component to (4) the second component, the first configuration configured to allow or selectively limiting rotation between the second component (2) elements of (4). One of faces of the (7,76), a first sequence and spaced at angular pitch of the first about the center of rotation between the second component and (2) the first component and the (4) and a, and a more or teeth (82) further at least one groove and the tooth groove or two or more of (78), does not correspond to the angular pitch of the first. The other, given two or more of the rotational position within the range between the first component and the second (2) the first component and the (4) of the surface (74, 76) rotational position, so as to selectively limit rotation and configured to engage one of the teeth or grooves (78) the first sequence, the first tooth or the first (84) I include a groove. The other of the surface of (74, 76), as selectively limiting the rotation between the second component (2) and the first component of (4) in the rotational position of further prescribed, and is configured to engage a further or teeth (82) further at least one groove.外科器具が、第1の面(76)を有する第1の構成要素(2)と、第1の構成要素(2)に連結される第2の構成要素(4)と、を含み、第1および第2の構成要素(2、4)は、互いに対して回転することができる。この器具は、第2の構成要素(4)に連結される第2の面(74)を有する第3の構成要素(32)を含むロック機構をさらに含む。第2の構成要素(4)に対する第3の構成要素(32)の動きは、第2の面(74)を第1の面(76)と係合または係合解除させて、第1の構成要素(2)と第2の構成要素(4)との間の回転を選択的に制限または許可するように構成される。面(7、76)のうち一方は、第1の構成要素(2)と第2の構成要素(4)との間の回転の中心の周りで第1の角度ピッチで離間した第1の配列(78)の2つまたは3つ以上の溝または歯と、第1の角度ピ
