A catheter (50, 100, 200, 300, 500) for delivering a prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) to a treatment site in a body lumen, the catheter (50, 100, 200, 300, 500) comprising: a pusher tube having a proximal end and a distal end; a sheath (124, 224, 324, 502) slidably disposed over the pusher tube; one or more self-expanding tubular prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) carried within the sheath (124, 224, 324, 502) which constrains the prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) in a radially contracted configuration, the prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) being independently releasable from the sheath (124, 224, 324, 502) as the sheath (124, 224, 324, 502) is retracted relative to the pusher tube, the prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) resiliently expanding upon release from the sheath (124, 224, 324, 502); and a radially expandable control member (130, 230, 330, 510) positionable within the prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) and having an expanded shape which engages an inner surface of at least one of the prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) to exert an outward force against the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800), the radially expandable control member (130, 230, 330, 510) being axially movable with the sheath (124, 224, 324, 502) so as to slide relative to the prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) in engagement therewith as the sheath (124, 224, 324, 502) is retracted relative to the pusher tube, wherein the pusher tube is adapted to prevent proximal motion of the one or more self-expanding prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) as the sheath (124, 224, 324, 502) is retracted, characterized in that the radially expandable control member (130, 230, 330, 510) is expandable with the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) as the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) self-expands, and the sheath (124, 224, 324, 502) comprises an expandable distal tip (254, 354, 506) that is expandable as the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) expands such that during deployment of the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800), the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) is trapped between the expandable distal tip (254, 354, 506) and the radially expandable control member (130, 230, 330, 510) to control axial movement of the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800). a pusher tube having a proximal end and a distal end; a sheath (124, 224, 324, 502) slidably disposed over the pusher tube; one or more self-expanding tubular prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) carried within the sheath (124, 224, 324, 502) which constrains the prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) in a radially contracted configuration, the prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) being independently releasable from the sheath (124, 224, 324, 502) as the sheath (124, 224, 324, 502) is retracted relative to the pusher tube, the prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) resiliently expanding upon release from the sheath (124, 224, 324, 502); and a radially expandable control member (130, 230, 330, 510) positionable within the prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) and having an expanded shape which engages an inner surface of at least one of the prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) to exert an outward force against the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800), the radially expandable control member (130, 230, 330, 510) being axially movable with the sheath (124, 224, 324, 502) so as to slide relative to the prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) in engagement therewith as the sheath (124, 224, 324, 502) is retracted relative to the pusher tube, wherein the pusher tube is adapted to prevent proximal motion of the one or more self-expanding prostheses (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) as the sheath (124, 224, 324, 502) is retracted, characterized in that the radially expandable control member (130, 230, 330, 510) is expandable with the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) as the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) self-expands, and the sheath (124, 224, 324, 502) comprises an expandable distal tip (254, 354, 506) that is expandable as the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) expands such that during deployment of the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800), the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800) is trapped between the expandable distal tip (254, 354, 506) and the radially expandable control member (130, 230, 330, 510) to control axial movement of the at least one prosthesis (126, 128, 228, 260, 262, 328, 360, 362, 400, 600, 700, 800).