Endoscope stabilizing catheter

A catheter, comprising:

• an elongate member defining an elongate member proximal end, an elongate member distal end, an outer surface, and a main body, the outer surface defining a side opening at a position between the elongate member proximal end and the elongate member distal end, the main body defining a first lumen, a second lumen, and a third lumen, the first lumen extending from the elongate member proximal end to the elongate member distal end, the second lumen extending from the elongate member proximal end to the side opening, the third lumen extending from the elongate member proximal end toward the elongate member distal end;
• a balloon disposed on the elongate member between the side opening and the elongate member distal end, the balloon having a balloon wall that defines a balloon cavity in fluid communication with the third lumen;
• an engagement member disposed in the second lumen, the engagement member defining an engagement member proximal end and an engagement member distal end, the engagement member proximal end extending axially beyond the elongate member proximal end, the engagement member distal end extending radially beyond the side opening toward the elongate member proximal end and biased in a radially outward direction relative to the outer surface of the elongate member, the engagement member distal end having an engagement portion;
• and
• a retractable catheter sheath disposed over the elongate member, the balloon, and the engagement member distal end, the retractable catheter sheath abutting the engagement portion.