A balloon assembly for a transcatheter delivery device configured for implanting a medical device, comprising: an inflatable balloon having an inflated state and a deflated state, wherein the inflatable balloon in the deflated state comprises: a valve retaining portion having a generally cylindrical shape and one or more axial folds ; a distal tapered portion connected to a distal end of the valve retaining portion , a proximal end of the distal tapered portion having a larger diameter (D1) than a distal end of the distal tapered portion and the valve retaining portion ; a proximal tapered portion connected to a proximal end of the valve retaining portion, a distal end of the proximal tapered portion having a larger diameter (D2) than a proximal end of the proximal tapered portion and the valve retaining portion ; a distal leg connected to the distal end of the distal tapered portion ; and a proximal leg connected to the proximal end of the proximal tapered portion ; wherein the distal tapered portion comprises one or more axial folds , the proximal tapered portion comprises one or more axial folds , wherein the proximal end of the distal tapered portion comprises a first radial fold connected to a second radial fold , the first and second radial folds forming a pocket extending distally at the proximal end of the distal tapered portion , and wherein the distal end of the proximal tapered portion comprises a radial fold that forms an obtuse or right angle relative to the valve retaining portion . an inflatable balloon having an inflated state and a deflated state, wherein the inflatable balloon in the deflated state comprises: a valve retaining portion having a generally cylindrical shape and one or more axial folds ; a distal tapered portion connected to a distal end of the valve retaining portion , a proximal end of the distal tapered portion having a larger diameter (D1) than a distal end of the distal tapered portion and the valve retaining portion ; a proximal tapered portion connected to a proximal end of the valve retaining portion, a distal end of the proximal tapered portion having a larger diameter (D2) than a proximal end of the proximal tapered portion and the valve retaining portion ; a distal leg connected to the distal end of the distal tapered portion ; and a proximal leg connected to the proximal end of the proximal tapered portion ; wherein the distal tapered portion comprises one or more axial folds , the proximal tapered portion comprises one or more axial folds , wherein the proximal end of the distal tapered portion comprises a first radial fold connected to a second radial fold , the first and second radial folds forming a pocket extending distally at the proximal end of the distal tapered portion , and a valve retaining portion having a generally cylindrical shape and one or more axial folds ; a distal tapered portion connected to a distal end of the valve retaining portion , a proximal end of the distal tapered portion having a larger diameter (D1) than a distal end of the distal tapered portion and the valve retaining portion ; a proximal tapered portion connected to a proximal end of the valve retaining portion, a distal end of the proximal tapered portion having a larger diameter (D2) than a proximal end of the proximal tapered portion and the valve retaining portion ; a distal leg connected to the distal end of the distal tapered portion ; and a proximal leg connected to the proximal end of the proximal tapered portion ; wherein the distal tapered portion comprises one or more axial folds , the proximal tapered portion comprises one or more axial folds , wherein the proximal end of the distal tapered portion comprises a first radial fold connected to a second radial fold , the first and second radial folds forming a pocket extending distally at the proximal end of the distal tapered portion , and <EOS>