| 主权项 |
1. An applicator for vascular grafts comprising:
a cylindrical stem (23) having a nosepiece (24), designed to precisely engage the inside surface of a blood vessel or prosthesis at least at an end portion (8,8′) of the vessel or prosthesis, and an annular protrusion (27) positioned at a distance from the nosepiece (24) and defining a first stop surface (40) extending at right angles to the cylindrical stem and designed to abut against a free front edge (9) of the end portion of the vessel or prosthesis; a hollow cylindrical element (31) designed to accommodate at least partially the outside surface of the blood vessel or prosthesis and mobile lengthwise along the cylindrical stem and with respect to the first stop surface (40); a body (22) coupled externally to the cylindrical stem (23) and extending within the hollow cylindrical element (31) and having an annular wall (41) protruding lengthwise from the annular protrusion (27) of the stem, to surround a stretch of the stem (23) at a radial distance therefrom, said wall (41) defining at its end a second stop surface (29) extending at right angles to the cylindrical stem (23), spaced longitudinally and by a precise predetermined measure from the first stop surface (40), and designed to abut against a matching surface of a connecting cylinder (4) of the vascular graft, whereby the annular wall (41) is configured to surround an outer surface of the end portion (8,8′) when the front edge (9) of the end portion of the vessel or prosthesis abuts against the first stop surface (40); engagement means (32) integral with the hollow cylindrical element (31), that can be actuated in such a way as to move a piercing element (1) of a vascular graft lengthways from a first, extracted position to a second position where the graft pierces the vessel or prosthesis at least at its front edge, wherein the hollow cylindrical element (31) is movable lengthwise with respect to the first stop surface (40) and the second stop surface (29), whereby the first stop surface (40) and the second stop surface (29) remain stationary during the movement of the hollow cylindrical element (31), wherein a maximum diameter of the nosepiece (24) is smaller than a diameter defined by the first stop surface (40). |
