Patent ID: 7850687

Claim:
An instrument for cutting a living tissue comprising: a cutter body having a distal end side and a proximal end side; a living tissue guiding groove for guiding the living tissue, the living tissue guiding groove being extended from the distal end side of the cutter body toward the proximal end side of the cutter body; a tissue holding part including an electrically insulating material being partially arranged in the living tissue guiding groove, the tissue holding part defining a slit groove which extends toward a proximal end side of the tissue holding part from a distal end side of the tissue holding part, has a distal end side and a proximal end side, has a substantially uniform groove width, and is configured to guide the living tissue from the living tissue guiding groove toward the proximal end side of the slit groove; a first electrode arranged on a first surface of the tissue holding part such that a part of a distal end of the first electrode is positioned on a proximal end side of the slit groove, the first electrode having a cutter configured to cut the living tissue guided from the living tissue guiding groove toward the proximal end side of the slit groove; and a second electrode arranged on a second surface of the tissue holding part opposite to the first surface of the tissue holding part on which the first electrode is arranged, and configured to hold a part of the tissue holding part with respect to the cutter body, wherein the first electrode, the tissue holding part and the second electrode are arranged on a distal end part of the cutter body so as to be superimposed in this order from the first surface toward the second surface of the tissue holding part.