Vascular graft
A vascular graft for anastomosis of blood vessels or ducts comprises piercing means ( 3 ) for engaging an end portion ( 8/8′ ) of a blood vessel or prosthesis and means ( 6, 6′ ) for precisely guiding one or more piercing elements ( 3 ) to pierce the wall of the vessel or prosthesis to a predetermined depth and in a predetermined direction.
1. A vascular graft for anastomosis of a pair of end portions ( 8 / 8 ′) of a blood vessel, each end portion terminating at an end, said vascular graft comprising:
a first staple ( 1 ), a second staple ( 1 ), a first cylindrical element ( 4 ) and a second cylindrical element ( 4 ), each staple ( 1 ) comprising a ring ( 2 ) and a plurality of legs ( 3 ) extending therefrom, each leg ( 3 ) terminating at a tip, the first cylindrical element ( 4 ) being configured to define guide means for the first staple ( 1 ), the second cylindrical element ( 4 ) being configured to define guide means for the second staple ( 1 ), the first staple ( 1 ) being matable with the first cylindrical element ( 4 ) so that the first staple legs ( 3 ) extend through the first cylindrical element ( 4 ), the second staple ( 1 ) being matable with the second cylindrical element ( 4 ) so that the second staple legs ( 3 ) extend through the second cylindrical element ( 4 ), each of the cylindrical elements ( 4 ) having a diameter, a length and a configuration effective (a) to permit each of the cylindrical elements to be placed externally around one of the respective end portions ( 8 / 8 ′), (b) to guide the legs of the corresponding staple to pierce a wall of the corresponding end portion from the outside with each tip of each leg ending up within the wall and short of the end of the end portion, (c) to permit the two cylindrical elements to be brought together and fixed in position in relationship to each other so that the two ends of the end portions of the blood vessel abut each other in longitudinal relationship, wherein the legs of the first and second staple are deformable, to bend inwardly when the two elements are brought together.
2. The graft according to claim 1 , wherein the first and second cylindrical elements ( 4 ) each comprise a hollow cylindrical connecting element ( 4 ) and in that the guide means consist of a plurality of holes ( 6 , 6 ′) spaced and dimensioned to match the staple legs and made along at least one longitudinal section of the connecting element ( 4 ).
3. The graft according to claim 2 , wherein the holes ( 6 ) are parallel to the axis of the connecting cylinder.
4. The graft according to claim 2 , wherein the holes ( 6 ′) are convergent with respect to the axis of the connecting cylinder.
5. The graft according to claim 1 , wherein said first and second cylindrical elements ( 4 ) each have an internal end edge ( 13 ) with a tapered guide profile.
6. The graft according to claim 1 , wherein said first and second cylindrical elements ( 4 ) each have respective male/female profiles to connect them to each other.
7. The graft according to claim 1 , comprising a reciprocal coupling element ( 16 ) equipped with means for engaging it with said first and second cylindrical elements ( 4 ).
8. The graft according to claim 7 , wherein the reciprocal coupling element ( 16 ) is a hollow cylinder whose diameter is such that it can be interference fitted with at least one portion of at least one connecting cylinder ( 4 ) of suitable diameter.
9. The graft according to claim 7 , comprising snap engagement means ( 12 , 18 ) between the reciprocal coupling element and at least one of said first and second cylindrical elements ( 4 ).
10. The graft according to claim 7 , wherein the reciprocal coupling element ( 16 ) is a hollow cylinder having at least one internal end edge with a tapered guide profile ( 20 ).
11. The graft according to claim 1 , wherein the staple legs ( 3 ) are made of plastically deformable metal.