The tool (40) has a jaw part (42) swingable relative to a base body around a pivotal axis (48), and a bearing (43) defining the pivotal axis. The bearing comprises two journals that are arranged at a distance from each other. Outer surfaces of the journals are rotationally symmetrical to the pivotal axis. A scalpel is displaceable in a working channel between a proximal position and a distal position. The working channel is arranged between the journals. A portion of the working channel is arranged between two parallel walls of the base body, where the walls are designed as bars.
