Patent ID: 7300450

Claim:
An instrument for surgery, in particular minimally invasive surgery, said instrument comprising: an elongate frame which, in the vicinity of a first end thereof, comprises an operating element ( 3 ), and, at a second end thereof, at least one working element ( 4 ), characterized in that the instrument ( 1 ) comprises means for feeding back a force which is exerted on the working element ( 4 ) of the instrument to the operating element ( 3 ), which means comprise at least a first force sensor ( 6 ) for measuring the force which is exerted on the working element, a control unit ( 10 ) and a first actuator ( 11 ) which is coupled to the operating element, the control unit being configured to control at least the first actuator ( 11 ) on the basis of a signal which originates from the first force sensor, wherein the first force sensor ( 6 ) comprises a glass fiber ( 16 ) configured to guide optical signals to and from the working element ( 4 ), whereby a light source and a light sensor are arranged in the vicinity of a first end of the glass fiber, and a second end of the glass fiber is fixed to the working element ( 4 ), and whereby a reflective surface ( 17 ) is arranged on the working element ( 4 ) at a defined distance from the second end of the glass fiber, which reflective surface reflects at least a proportion of the light which originates from the light source and emerges from the second end of the glass fiber into the second end of the glass fiber.