stent preferably the lumen 16 has ends that flare or mushroom gently thereby creating a funnel for guiding a delivery catheter into the center of the lumen 16 fig1 and 2 show that even when the cuff 10 is in a radially expanded relaxed configuration the lumen 16 is small and very well defined thus when deployed the mushroom like ends 12 and 13 expand and conform to the shape of the target vessel lumen while the cuff lumen 16 remains well defined and relatively centered within the cuff 10 thus the cuff 10 presents an ideal target and guide for a physician placing a prosthetic valve or stent within the cuff preferably the cuff 10 is radiopaque making the target it presents even more accessible the deployment of the cuff 10 is illustrated in fig3 7 beginning with fig3 a cuff 10 is percutaneously delivered to a targeted stenosed valve 18 via a delivery catheter 20 the catheter 20 is advanced until a distal end 22 of the catheter is past the targeted valve 18 as seen in fig4 the delivery catheter 20 is then retracted relative to the cuff 10 doing so releases the distal end 12 which immediately flares outwardly with the end 12.