Surgical cutting instrument comprises an outer tubular member (18) and the inner tubular member (22). The outer tubular member, the proximal portion (40), an intermediate portion (42), a distal portion (44), and a side wall (60). The sidewall defines a central lumen extending to the distal portion from the proximal portion (46). Sidewalls, means for guiding a fluid to the distal portion from the proximal portion in the side wall of the outer tubular member, and also comprises a distal opening located so that water injection in the bar (24) and the treatment site. The inner tubular member (22) is rotatably received in the central lumen. The distal end of the inner tubular member extends from the distal portion of the outer tubular member distally to form a bar that is exposed to the distal portion of the outer tubular member.外科切除器具は、外側管状部材(18)と内側管状部材(22)とを備える。外側管状部材は、近位部(40)、中間部(42)、遠位部(44)、および側壁(60)を備える。側壁は、近位部から遠位部に延在する中央管腔(46)を画定する。側壁は、外側管状部材の側壁の中で近位部から遠位部に流体を導く手段、および、バー(24)および治療部位に注水するように位置する遠位開口部をも備える。内側管状部材(22)は、中央管腔の中に回転可能に受容される。内側管状部材の遠位端は、外側管状部材の遠位部から遠位に延在し、外側管状部材の遠位部に対して露出するバーを形成する。
