adapted to be received in a tuohy borst adapter 32 fig1 which is connected by a pressure line 34 to an inflation device 36 the outer diameter of member 13 should be substantially less than about 3 mm so that it can be backloaded through the bridge 38 of a conventional urological cystoscope 40 fig5 illustrates an alternative embodiment of the invention wherein the reinforcing core member 15 extends through the interior of the balloon 11 and is secured to a plug 23 on the distal end of a coil 24 the plug 23 is soldered between the distal end of the coil 24 and the distal end of the reinforcing member 15 an intermediate member 42 is provided within the inner lumen 14 under the distal waist 21 of the balloon 11 to provide a passage and guide for core member 15 as shown in copending application ser no 07 483 394 filed feb 14 1990 which is hereby incorporated herein by reference in its entirety the catheter of the alternative embodiment is otherwise as shown in fig1 the balloon 11 of the catheter must have a relatively large inflated diameter i e at least about 15 to about 50 mm in order to.