A trapping catheter for insertion into a guide catheter assembly comprises a balloon and a trapping catheter body bounding an inflation lumen extending longitudinally within the trapping balloon catheter. The inflation lumen has a distal end opening into an internal space bounded by the balloon. The trapping catheter body is provided with a stopper for abutting against an abutment at a proximal end of the guide catheter assembly so as to determine a maximum insertion depth of the trapping catheter into the guide catheter. A kit and method for preparing a trapping catheter prior to insertion into a guide catheter is also described.
