fig1 a e show a method for using a transparent dome 1310 in the form of a balloon scope and catheter 1324 holding the balloon at the catheter 39 s side the scope has a lens 1301 for a user to view what is further distal than the scope 39 s distal face 1300 and an operative channel 1302 for passing the catheter 1324 the catheter 1324 holds the transparent dome 1310 at its side in this embodiment the transparent dome is held at a hole along the catheter 39 s side through which air may flow to inflate the transparent dome 1310 however the transparent dome may be held in other manners such as around the circumference of the catheter 1324 a retractable needle is shown as an example of a therapeutic device 1326 which may be inserted through the catheter however other therapeutic devices either insertable through the catheter or fixed at the distal tip of the catheter 1324 may be used in fig1 a the catheter 1324 is shown withdrawn within the operative channel 1302 the transparent dome 1310 deflated and thereby fitting within the operative channel 1302 along with the catheter 1324 then in fig1 b the catheter 1324 is advanced distally relative to the scope such that the distal.