Patent ID: 8795275

Claim:
A tubular shaft instrument for separating tissue, comprising: a tubular shaft; a first and a second mouth part each having at least one clamping surface for fixing tissue in a fixing plane which extends along a longitudinal axis of the instrument, whereby at least one of the mouth parts is joined to the tubular shaft; and a cutting device having a blade that is for cutting of the fixed tissue and that is displaceable in a cutting direction by means of an actuating device, wherein at least one of the mouth parts comprises an opening extending along the cutting direction, which forms a blade guide for guiding the blade during cutting, wherein the blade is displaceably guided substantially parallel to the fixing plane and is preloaded with a force that is perpendicular to the fixing plane during cutting by means of a preloading device, and wherein the blade is curved such that the blade glides over the tissue preloaded in the fixing plane when moved back and forth within the blade guide.