A delivery system for use with a prosthetic heart valve having a stent frame to which a valve structure is attached, the system comprising: a shaft assembly including a distal end and a nose cone disposed at the distal end, wherein a coupling structure is disposed near the distal end and configured to be coupled to a distal end of the prosthetic heart valve; a sheath assembly defining a lumen sized to slidably receive the shaft assembly; and wherein the delivery system is configured to transition from a loaded state in which the sheath assembly encompasses the prosthetic heart valve to a deployed state in which the sheath assembly is withdrawn from the prosthetic heart valve, and wherein the coupling structure is configured to provide a controlled expansion or contraction of the distal end of the prosthetic heart valve based on longitudinal movement of the distal end of the shaft assembly, characterised in that the coupling structure is slidably attached to the nose cone, and wherein the coupling structure and the nose cone are configured to slide in a longitudinal direction with respect to each other, wherein the nose cone comprises a tip portion and a tubular portion defining a lumen, which is configured to slidably receive the coupling structure, wherein the coupling structure comprises a tubular base portion and a plurality of legs extending from the tubular base portion, and wherein when the coupling structure is positioned within the tubular portion, the tubular portion of the nose cone maintains the coupling structure in the compressed state, which correspondingly compresses the distal end of the prosthetic heart valve, wherein the coupling structure can slide outside of the tubular portion, which correspondingly allows the distal end of the prosthetic heart valve to self expand. a shaft assembly including a distal end and a nose cone disposed at the distal end, wherein a coupling structure is disposed near the distal end and configured to be coupled to a distal end of the prosthetic heart valve; a sheath assembly defining a lumen sized to slidably receive the shaft assembly; and wherein the delivery system is configured to transition from a loaded state in which the sheath assembly encompasses the prosthetic heart valve to a deployed state in which the sheath assembly is withdrawn from the prosthetic heart valve, and wherein the coupling structure is configured to provide a controlled expansion or contraction of the distal end of the prosthetic heart valve based on longitudinal movement of the distal end of the shaft assembly, characterised in that the coupling structure is slidably attached to the nose cone, and wherein the coupling structure and the nose cone are configured to slide in a longitudinal direction with respect to each other, wherein the nose cone comprises a tip portion and a tubular portion defining a lumen, which is configured to slidably receive the coupling structure, wherein the coupling structure comprises a tubular base portion and a plurality of legs extending from the tubular base portion, and wherein when the coupling structure is positioned within the tubular portion, the tubular portion of the nose cone maintains the coupling structure in the compressed state, which correspondingly compresses the distal end of the prosthetic heart valve, wherein the coupling structure can slide outside of the tubular portion, which correspondingly allows the distal end of the prosthetic heart valve to self expand.