in the art and are not presented in detail an elastomeric gasket 32 prevents irrigation fluid from entering into the drive housing a gasket 31 prevents any fluid seepage from the back of resectoscope 10 and secures the interstitial laser fiber 19 to the instrument a pistol like hand grip 24 is attached to the resectoscope 10 near the pneumatic motor 30 the motor 30 is activated by trigger switch 23 located on hand grip 24 trigger switch 23 controls the longitudinal movement of the motor 30 along the longitudinal axis of the elongated cylindrical member 16 by a lever mechanism 25 and a spring means 26 as a result the rotatable shaft 21 connected to motor 30 is extended beyond the distal end portion 17 of the resectoscope 10 and the cutting blades 18 are unsheathed and opened simultaneously the trigger mechanism activates the motor 30 and regulates the supply of air from a compressor not shown it should be understood that while a pneumatic drive is preferred other means of rotating shaft 21 may also be used such as an electric motor or manual means the drive mechanism is not intended to be limited to any specific form an air driven micromotor is preferred because it is more easily cleaned and sterilized releasing the trigger 23 the motor.