Anastomosis systems

An end-side anastomosis connector for connecting a graft to a host vessel having a wall with an opening therein and having inner and outer surfaces, the inner surface having a radius of curvature comprising an elongated fitting having proximal and distal extremities and configured to form a seal with the opening in the host vessel wall, the proximal extremity of the elongate fitting having a first fixation mechanism adapted to be connected to the graft, the distal extremity of the elongate fitting having a second fixation mechanism adapted to be secured into the opening in the wall of the host vessel, the second fixation mechanism including a leading petal having a cross-section with a radius of curvature approximating the radius of curvature of the inner surface of the host vessel and adapted to engage the inner surface of the wall in the vicinity of the opening therein, said second fixation mechanism also including a first portion generally overlying the leading petal and being adapted to be engaged by the outer surface of the wall in the vicinity of the opening therein and a second portion extending away from the first portion and being adapted to be engaged by the outer surface of the wall in the vicinity of the opening, said second fixation mechanism also including a rear petal having a free position extending away from the leading petal and underlying the second portion and being adapted to be engaged by the inner surface of the wall in the vicinity of the opening therein, said rear petal being deflectable away from the free position to facilitate entrance of the rear petal through the opening in the wall.