A catheter comprising : an expandable wall assembly comprising an expandable wall having a distal end ,a proximal end , and an interior cavity , an insert coupled to the distal end of the expandable wall , and a proximal insert having a cylindrical outer surface sized to be disposed within the interior cavity at the proximal end of the expandable wall ; a handle assembly ; a first tube having a distal end secured to the insert and a proximal end secured to the handle assembly ; a second tube having a distal end portion secured within a lumen of the proximal insert and a proximal end secured to the handle assembly , at least a portion of the first tube being disposed within at least a portion of the second tube ; a pusher attached to the second tube , the pusher spaced from the expandable wall assembly by a distance sized to accommodate a replacement aortic valve; an outer sheath having a lumen ; and wherein the outer sheath is movable between: a first position wherein the expandable wall of the expandable wall assembly is located within the lumen of the outer sheath ; and a second position wherein the expandable wall of the expandable wall assembly is not located within the lumen of the outer sheath ; and characterized in that the handle assembly is configured to provide for axial translation of the first tube relative to the second tube when the outer sheath is in the second position, and wherein said axial translation of the first tube relative to the second tube alters the expandable wall of the expandable wall assembly between: a first state in which the proximal and distal ends of the expandable wall are separated by a first distance; and a second state in which the proximal and distal ends of the expandable wall are separated by a second distance, the first distance being greater than the second distance, and wherein at least a portion of the expandable wall radially expands as it is altered from the first state to the second state. an expandable wall assembly comprising an expandable wall having a distal end ,a proximal end , and an interior cavity , an insert coupled to the distal end of the expandable wall , and a proximal insert having a cylindrical outer surface sized to be disposed within the interior cavity at the proximal end of the expandable wall ; a handle assembly ; a first tube having a distal end secured to the insert and a proximal end secured to the handle assembly ; a second tube having a distal end portion secured within a lumen of the proximal insert and a proximal end secured to the handle assembly , at least a portion of the first tube being disposed within at least a portion of the second tube ; a pusher attached to the second tube , the pusher spaced from the expandable wall assembly by a distance sized to accommodate a replacement aortic valve; an outer sheath having a lumen ; and wherein the outer sheath is movable between: a first position wherein the expandable wall of the expandable wall assembly is located within the lumen of the outer sheath ; and a second position wherein the expandable wall of the expandable wall assembly is not located within the lumen of the outer sheath ; and characterized in that the handle assembly is configured to provide for axial translation of the first tube relative to the second tube when the outer sheath is in the second position, and wherein said axial translation of the first tube relative to the second tube alters the expandable wall of the expandable wall assembly between: a first state in which the proximal and distal ends of the expandable wall are separated by a first distance; and a second state in which the proximal and distal ends of the expandable wall are separated by a second distance, the first distance being greater than the second distance, and wherein at least a portion of the expandable wall radially expands as it is altered from the first state to the second state. <EOS>