An apparatus assists in the delivery of a medical instrument to within a body organ of a body wherein the body organ has an inner wall. The apparatus includes an inflatable structure arranged to attach to the medical instrument with a minimum profile when deflated to permit the medical instrument and the attached deflated structure to be inserted into the body organ. The inflatable structure is inflatable to the inflatable structure to enlarge and grip the inner wall of the organ while permitting movement of the medical instrument relative to the inflatable structure and the body organ. The inflatable structure is deflatable to permit the inflatable structure to be removed from the body organ.
