US Patent 7101378 Surgical treatment device

A biotissue excising instrument includes a tubular sheath inserted into a body, manipulator inserted into the sheath through leading end of the manipulator and having a loop portion that can be unfolded and contracted to accommodate biotissue to be excised. A slit is formed leading end the sheath to project and sink loop portion of the treatment portion so that manipulator is advanced or retreated to laterally project or sink the loop portion out of or into the or contract the loop portion, the sheath, and a treatment portion provided at thus excising the biotissue loop portion.