Assembly for positioning an access sheath and a security guide next to the access sheath where the access sheath is adapted to be threaded onto a catheter. The catheter includes a groove extending between an outer hole and an inner hole which groove has a greater width than a width of the security guide. The access sheath includes an opening extending longitudinally from a distal end of the access sheath and is rotatable around the catheter between an open position in which the opening of the access sheath at least partially coincides with the groove of the catheter and enables the release of the security guide, and a closed position in which the access sheath covers the groove of the catheter maintaining the security guide within the groove.
