A medical device for implantation in a patient, the medical device including: a stent including: a proximal region comprising a cylindrical shape having a first outer diameter when the stent is in an expanded state; a distal region comprising a cylindrical shape having a second outer diameter when the stent is in the expanded state, wherein the second outer diameter is greater than the first outer diameter; a tapered region disposed between the proximal and distal regions, wherein the tapered region transitions the stent from the first diameter to the second diameter; and a valve coupled to at least a portion of the stent, the valve having proximal and distal regions, characterised in that the proximal region of the valve is at least partially positioned within the proximal region of the stent; and that there are a plurality of closed cells disposed around the perimeter of the proximal region of the stent, and another plurality of closed cells disposed around the perimeter of the distal region of the stent; wherein the tapered region includes a plurality of closed cells, wherein an overall length of each of the closed cells of the tapered region is greater than an overall length of each of the closed cells of the proximal region of the stent and less than an overall length of each of the closed cells of the distal region of the stent when the stent is in the expanded state. a stent including: a proximal region comprising a cylindrical shape having a first outer diameter when the stent is in an expanded state; a distal region comprising a cylindrical shape having a second outer diameter when the stent is in the expanded state, wherein the second outer diameter is greater than the first outer diameter; a tapered region disposed between the proximal and distal regions, wherein the tapered region transitions the stent from the first diameter to the second diameter; and a valve coupled to at least a portion of the stent, the valve having proximal and distal regions, characterised in that the proximal region of the valve is at least partially positioned within the proximal region of the stent; and that there are a plurality of closed cells disposed around the perimeter of the proximal region of the stent, and another plurality of closed cells disposed around the perimeter of the distal region of the stent; wherein the tapered region includes a plurality of closed cells, wherein an overall length of each of the closed cells of the tapered region is greater than an overall length of each of the closed cells of the proximal region of the stent and less than an overall length of each of the closed cells of the distal region of the stent when the stent is in the expanded state. a proximal region comprising a cylindrical shape having a first outer diameter when the stent is in an expanded state; a distal region comprising a cylindrical shape having a second outer diameter when the stent is in the expanded state, wherein the second outer diameter is greater than the first outer diameter; a tapered region disposed between the proximal and distal regions, wherein the tapered region transitions the stent from the first diameter to the second diameter; and a valve coupled to at least a portion of the stent, the valve having proximal and distal regions, characterised in that the proximal region of the valve is at least partially positioned within the proximal region of the stent; and that there are a plurality of closed cells disposed around the perimeter of the proximal region of the stent, and another plurality of closed cells disposed around the perimeter of the distal region of the stent; wherein the tapered region includes a plurality of closed cells, wherein an overall length of each of the closed cells of the tapered region is greater than an overall length of each of the closed cells of the proximal region of the stent and less than an overall length of each of the closed cells of the distal region of the stent when the stent is in the expanded state.