A mounting structure for connecting a device to an organ. The mounting structure includes a mounting element defining a bore. The mounting element is adapted for mounting to an exterior surface of the organ of a living subject. The mounting element includes a collar having a deformable wall defining a main bore. A gimbal ring disposed within the main bore and within the collar is included, the gimbal ring defining a gimbal bore co-axial with the main bore and including a plurality of separate arcuate elements cooperatively disposed in a circumferential direction around the gimbal bore, the plurality of separate arcuate elements being movable toward one another to constrict the gimbal bore.
