| 摘要 |
A urological resectoscope stem ( 1 ) including an insulating muff ( 11 ) constituting the end zone of the stem ( 1 ), further including an outer tube ( 2, 9 ), an inner tube ( 3 ) and a cross-sectionally annular distally closed return flow duct ( 4 ) which is subtended at least over the larger part of its length between the outer tube ( 2, 9 ) and the inner tube ( 3 ), where the stem ( 1 ) is fitted with outwardly open, distally extending grooves ( 10 ), wherein the annular return flow duct ( 4 ) communicates directly by apertures ( 19 ) with the grooves ( 10 ).
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