A delivery device for implantation of a prosthetic device within the body, the prosthetic device being radially expandable from a radially compressed state to a radially expanded state, the delivery device comprising: an inflatable balloon; a proximal stop and a distal stop configured to limit longitudinal movement of the prosthetic device relative to the balloon while the prosthetic device is mounted over the balloon in the radially compressed state between the proximal stop and the distal stop, the prosthetic device having a proximal end and a distal end; and an outer shaft having a lumen and an inner shaft extending through the lumen of the outer shaft, wherein the distal stop is attached to an outer surface of the inner shaft, wherein the proximal stop and the distal stop each comprise an end portion (628, 630) positioned within the balloon and configured to be positioned adjacent a respective end of the prosthetic device when the prosthetic device is radially compressed between the proximal and distal stops, each of the end portions (628, 630) comprising at least one longitudinally extending slot that allows the end portion (628, 630) of the respective stop (614, 618) to be radially compressed to a smaller diameter, characterized in that the proximal stop is configured to abut the proximal end of the prosthetic device and the distal stop is configured to abut the distal end of the prosthetic device, wherein the proximal stop is attached to a distal end of the outer shaft and/or attached to an outer surface of the inner shaft, wherein the at least one longitudinally extending slot in each stop end portion (628, 630) is configured to allow a balloon-inflation fluid to flow radially through the respective stop (614, 618). an inflatable balloon; a proximal stop and a distal stop configured to limit longitudinal movement of the prosthetic device relative to the balloon while the prosthetic device is mounted over the balloon in the radially compressed state between the proximal stop and the distal stop, the prosthetic device having a proximal end and a distal end; and an outer shaft having a lumen and an inner shaft extending through the lumen of the outer shaft, wherein the distal stop is attached to an outer surface of the inner shaft, wherein the proximal stop and the distal stop each comprise an end portion (628, 630) positioned within the balloon and configured to be positioned adjacent a respective end of the prosthetic device when the prosthetic device is radially compressed between the proximal and distal stops, each of the end portions (628, 630) comprising at least one longitudinally extending slot that allows the end portion (628, 630) of the respective stop (614, 618) to be radially compressed to a smaller diameter, characterized in that the proximal stop is configured to abut the proximal end of the prosthetic device and the distal stop is configured to abut the distal end of the prosthetic device, wherein the proximal stop is attached to a distal end of the outer shaft and/or attached to an outer surface of the inner shaft, wherein the at least one longitudinally extending slot in each stop end portion (628, 630) is configured to allow a balloon-inflation fluid to flow radially through the respective stop (614, 618).