Patent ID: 7404817

Claim:
An endoscopic treatment apparatus comprising: an elongated sheath having a distal end portion and a through-hole which has an opening at the distal end portion; an elongated actuating member having a central axis, a distal end portion, and at least one elastic deformable portion provided at the distal end portion thereof, the actuating member being inserted into the through-hole of the sheath and movable relative to the sheath; a treatment section for performing a high-frequency treatment, connected to the elastic deformable portion of the actuating member, the treatment section being laterally extendable for forming a loop when the treatment section is extended from the opening of the sheath by movement of the actuating member, the loop having a distal end, a proximal end, a loop central axis connecting the distal and proximal ends thereof, the loop being symmetric with respect to the loop central axis, and a loop plane including the loop central axis, the loop plane being substantially parallel with a moving axis of the actuating member; the proximal end of the loop comprising first and second curved proximal ends connecting the loop to the elastic deformable portion, the first and second curved proximal ends being asymmetric with respect to the loop central axis, wherein the ioop central axis of the loop is tilted against the moving axis of the actuating member at a tilting angle, by elastic deformation of the elastic deformable portion due to an inherent elastically restoring force, when the treatment section and distal end of the actuating member are extended from the opening of the sheath.