Endoscopic accessory

An accessory device, for use with an examination device, the accessory device comprising:

• a wall structure having a proximal portion spaced in a lengthwise direction from a distal portion along an axis, the wall structure having a first edge and a second edge extending parallel to the axis in the lengthwise direction from a proximal end of the proximal portion to a distal end of the distal portion and separated by a wall structure width, wherein the wall structure includes an interior surface, an exterior surface, and an intermediate space therebetween;
• a tip material at located at the distal portion and having a tip length extending distally beyond the distal end, the tip material having a tip width greater than the wall structure width;
• a proximal balloon located on the exterior surface at the distal portion;
• an inner balloon located on the interior surface and proximally spaced from the distal end;
• and
• a hub portion at the proximal portion of the wall structure and on the exterior surface;
• wherein in a pre-deployment configuration the wall structure is sufficiently flexible to assume a flat profile across the wall structure width;
• wherein the first edge and the second edge are configured to be releasably joined together to form a fluid tight seal therebetween such that the wall structure can form a closed overtube profile about the examination device;
• wherein in the closed overtube profile the tip width of the tip material permits the tip material to circumferentially overlap the distal end.