A vessel prosthesis delivery device comprising: a catheter ; an elongated pusher having a distal pusher end and a proximal pusher end and being disposed in the catheter ; a retention structure connected to the pusher , the retention structure comprising a mesh of braided wires; characterized by the retention structure having a proximal end fixed to the pusher near the distal end of the pusher, and a distal structural end extending distally beyond the distal end of the pusher, the retention structure having a tubular shape in a radially compressed configuration and a conical shape opening distally relative to the elongated pusher when in a radially expanded configuration; wherein the retention structure is heat set to adopt the radially expanded configuration when not constrained within the catheter ; engagement elements fixed on the retention structure and protruding radially inward of the retention structure and sized to fit corresponding gaps in a prosthesis , wherein the distal structural end of the retention structure is configured to be positioned over a proximal end of the prosthesis so as to leave a distal end of the prosthesis uncovered by the retention structure ; and wherein the retention structure is configured to engage the prosthesis in the radially compressed configuration and release the prosthesis in the radially expanded configuration; wherein the pusher is configured to be advanced distally toward a distal end of the catheter to let the retention structure distally open in the conical shape thereby allowing the prosthesis to expand; wherein the retention structure allows for retraction of the prosthesis after the prosthesis is completely, distally outside of the catheter . a catheter ; an elongated pusher having a distal pusher end and a proximal pusher end and being disposed in the catheter ; a retention structure connected to the pusher , the retention structure comprising a mesh of braided wires; characterized by the retention structure having a proximal end fixed to the pusher near the distal end of the pusher, and a distal structural end extending distally beyond the distal end of the pusher, the retention structure having a tubular shape in a radially compressed configuration and a conical shape opening distally relative to the elongated pusher when in a radially expanded configuration; wherein the retention structure is heat set to adopt the radially expanded configuration when not constrained within the catheter ; engagement elements fixed on the retention structure and protruding radially inward of the retention structure and sized to fit corresponding gaps in a prosthesis , wherein the distal structural end of the retention structure is configured to be positioned over a proximal end of the prosthesis so as to leave a distal end of the prosthesis uncovered by the retention structure ; and wherein the retention structure is configured to engage the prosthesis in the radially compressed configuration and release the prosthesis in the radially expanded configuration; wherein the pusher is configured to be advanced distally toward a distal end of the catheter to let the retention structure distally open in the conical shape thereby allowing the prosthesis to expand; wherein the retention structure allows for retraction of the prosthesis after the prosthesis is completely, distally outside of the catheter . <EOS>