Graft securing system, applicator and method
A graft securing system including at least one expandable frame moveable from a collapsed state to an expanded state, and at least one anchor coupled to the frame via an elastic support strut, said anchor including: an anchor base, at least one deflectable prong protruding from said anchor base and having at least one penetration tip and at least one restraining sleeve at least partially slideably moveable along the at least one prong and wherein in the collapsed state, the support strut is biased radially centrally bringing the at least one anchor to point generally axially, parallel to a longitudinal axis of the frame.
1. A tissue anchoring device comprising at least one anchor attached to an expandable frame, said at least one anchor including at least two tissue-penetrating prongs and a restraining sleeve at least partially slideably moveable along said at least two tissue-penetrating prongs, said at least two tissue-penetrating prongs having a first sleeve stop shaped as a rib protruding outwards from said at least two tissue-penetrating prongs and extending beyond an internal cross-section of said restraining sleeve for preventing said restraining sleeve from sliding past a tip of said at least one anchor, wherein moving of said restraining sleeve from a first position where said restraining sleeve restrains said at least two tissue-penetrating prongs at a first configuration for delivery into a tissue, to a second position along said at least two tissue-penetrating prongs releases said at least two tissue-penetrating prongs to deflect in opposite directions at a second configuration for securement to said tissue.
2. The device of claim 1 , wherein said at least one anchor is elastically attached to said expandable frame and can be elastically bent from a direction that is generally perpendicular to a longitudinal axis of said frame to a direction that is generally parallel to said longitudinal axis of said frame.
3. The device of claim 2 , wherein, when said frame is in an expanded state, said at least one anchor is generally perpendicular to said longitudinal axis of said frame.
4. The device of claim 2 , wherein said at least one anchor is attached to said frame through an elastic support strut.
5. The device of claim 4 , wherein an end of said support strut fits within a cutout at a base of said at least one anchor.
6. The device of claim 1 , wherein said at least two tissue-penetrating prongs are pre-shaped to assume said second configuration where said at least two tissue-penetrating prongs are deflected away from each other.
7. The device of claim 1 , wherein, when in said first position, said restraining sleeve maintains said at least two tissue-penetrating prongs juxtaposed throughout their length at said first configuration for delivery into said tissue.
8. The device of claim 7 , wherein said at least two tissue-penetrating prongs comprise a buckling preventing lock configured to prevent buckling of said at least one anchor during penetration into said tissue.
9. The device of claim 8 , wherein said buckling prevention lock comprises a protrusion extending from a first prong of said at least two tissue-penetrating prongs, and a recess in a juxtaposed second prong of said at least two tissue-penetrating prongs configured to receive said at least one protrusion.
10. The device of claim 1 , wherein said at least two tissue-penetrating prongs includes a second sleeve stop, and wherein proximal movement of said restraining sleeve past said second sleeve stop requires a predetermined force.
11. The device of claim 1 , wherein said at least two tissue-penetrating prongs comprise two internal prongs positioned between two external prongs.
12. The device of claim 11 , wherein said two internal prongs include a blunt tip.
13. The device of claim 1 , wherein said frame is self expandable.
14. The device of claim 1 , wherein said at least one anchor is positioned between longitudinal struts of said frame.
15. The device of claim 1 , wherein said at least one anchor includes two tissue penetration tips.
16. The device of claim 15 , wherein each of said two tissue penetration tips of said anchor includes two cutting edges.
17. d) A method of securing a graft to a tissue comprising:
(a) providing a tissue anchoring device including at least one anchor elastically attached to an expandable frame, said at least one anchor including at least two tissue-penetrating prongs and a restraining sleeve at least partially slideably moveable along said at least two tissue-penetrating prongs, said at least two tissue-penetrating prongs having a first sleeve stop shaped as a rib protruding outwards from said at least two tissue-penetrating prongs and extending beyond an internal cross-section of said restraining sleeve for preventing said restraining sleeve from sliding past a tip of said at least one anchor;
(b) collapsing said expandable frame within a delivery catheter such that said at least one anchor is forced in a direction that is generally parallel to a longitudinal axis of said frame;
(c) releasing said device within the graft positioned against a tissue thereby releasing said at least one anchor to elastically move to a direction that is generally perpendicular to said longitudinal axis of said frame;
(d) penetrating a wall of the graft and said tissue via said at least two tissue-penetrating prongs such that said at least two tissue-penetrating prongs transition from a first configuration where said restraining sleeve restrains said at least two tissue-penetrating prongs for delivery into said tissue to a second configuration where said restraining sleeve releases said at least two tissue-penetrating prongs to deflect in opposite directions for securement of said device to the graft and the tissue.
18. The method of claim 17 , wherein the tissue is vascular tissue.
19. The method of claim 17 , wherein (d) is effected by inflating a balloon within said frame.
20. The method of claim 19 , wherein said balloon is at least partially covered by a protective sleeve.