Patent ID: 7169147
Filing Date: 2007-01-30
Classification: A61B

Abstract:
1. A ureter resectoscope with an elongate flexible stem tube ( 4 ) of substantial length and small external diameter, of which a distal end piece ( 5 ) is made from insulating material and which accommodates an optical unit ( 6 ) as well as a rod-shaped instrument carrier ( 11 ) that is disposed so as to be longitudinally displaceable parallel to the optical unit, said instrument carrier bearing, on its distal end, an electrode ( 12 , 12 ′) that can be supplied with high-frequency current and, on its proximal end after passing through a bore in a main body ( 1 ) disposed on a proximal end of the stem tube, is fixed and electrically contacted on a slider ( 13 ) mounted so as to be longitudinally displaceable, wherein the instrument carrier is guided in the vicinity of its distal end on the optical unit ( 6 ) by a sliding tube ( 20 ), and wherein on the optical unit ( 6 ) proximally from the sliding tube ( 20 ) a stop ( 19 ) is disposed in a position, which, with the instrument carrier ( 11 ) retracted until the sliding tube ( 20 ) is in abutment against the stop ( 19 ), results in a sufficient electrical safety distance between the electrode ( 12 ) and the distal top of the optical unit ( 6 ).