Each cylindrical shaft pipe ( 4, 10 ) , the shaft tube and the front end side terminal portion which is formed in a hollow hemisphere integral with ( 12, 13 ) , assembled to each other and a cutting window ( 6, 11 ) has two tubular cutters arranged the combined to ( 2,9 ) , said outer tubular cutter ( 2 ) is non-rotatably , and the inner tubular cutter ( 9 ) is fixed to the body ( 3) driven in rotation the surgical milling instruments , at least one of said terminal portions ( 12, 13 ) is , the hole which surrounds the axis of the shaft tube to which it belongs ( 4,10 ) ( 22 ) , the periphery of the hole ( 22 ) at its periphery It has a connection to be inserted plate ( 14, 15, 16, 18 ) .それぞれ円筒形のシャフト管(4,10)と、前記シャフト管と一体に中空半球状に形成される先端側端末部分(12,13)と、切除窓(6,11)とを備えて互いに組合わされて配置される2つの管状カッター(2,9)を有し、前記外側管状カッター(2)が回転不能に、かつ前記内側管状カッター(9)が回転駆動に本体(3)に固定される外科用フライス器具は、前記端末部分(12,13)の少なくとも一方が、所属する前記シャフト管(4,10)の軸を取り囲む孔(22)に、その周縁において前記孔(22)の周縁に接続される挿入プレート(14,15,16,18)を備えている。
