A system for repairing a defective heart valve. The system includes a delivery device, a balloon and a prosthetic heart valve. The delivery device includes an inner shaft assembly and a delivery sheath assembly. The delivery sheath assembly provides a capsule terminating at a distal end. The prosthesis includes a stent carrying a prosthetic valve. In a delivery state, the capsule maintains the prosthesis in a collapsed condition over the inner shaft assembly, and the balloon is in a deflated arrangement radially between the prosthetic heart valve and the capsule. In a deployment state, at least a portion of the balloon and at least a portion of the prosthetic heart valve are distal the capsule. Further, the balloon is inflated and surrounds an exterior of at least a portion of the prosthetic heart valve. The balloon controls self-expansion of the prosthetic heart valve.
