Anchors and locks for percutaneous valve implants
An apparatus includes a thread ( 58 ) and a tissue anchor ( 60 ) coupled to the thread. The anchor includes a proximal portion ( 60 p ), shaped to define one or more appendages ( 82 ), a distal portion ( 60 d ), and a plurality of strips ( 84 ) joining the proximal portion to the distal portion. The anchor is configured to anchor the thread at tissue ( 42 ) of a subject by virtue of the appendages expanding radially, and the strips expanding radially to form respective loops at a distal side of the tissue, upon removal of a radially-constraining force from the anchor. Other embodiments are also described.
1. Apparatus, comprising:
a thread; and
a tissue anchor, comprising:
a proximal portion, shaped to define one or more straight radially-expandable appendages configured to expand radially, without curving, by pivoting with respect to a remainder of the proximal portion;
a distal portion; and
a plurality of radially-expandable strips joining the proximal portion to the distal portion,
the anchor being coupled to the thread so as to render the anchor configured to anchor the thread at tissue of a subject by virtue of the appendages expanding radially within the tissue, and the strips expanding radially to form respective loops at a distal side of the tissue, upon removal of a radially-constraining force from the anchor.
2. The apparatus according to claim 1 , wherein the strips are configured to expand such that the loops are arranged in a circular formation.
3. The apparatus according to claim 1 , wherein the thread passes at least partly through the anchor.
4. The apparatus according to claim 3 , wherein the anchor is coupled to the thread by virtue of the thread being knotted distally to the anchor.
5. The apparatus according to claim 3 , wherein the anchor is coupled to the thread by virtue of the thread being attached to an inner wall of the distal portion of the anchor.
6. The apparatus according to claim 1 , wherein the strips consist of 2-8 strips.
7. The apparatus according to claim 1 , wherein, for each of the strips, a circumferential angle between a proximal end of the strip and a distal end of the strip is at least 5 degrees.
8. The apparatus according to claim 7 , wherein the circumferential angle is between 10 and 30 degrees.
9. The apparatus according to claim 1 , wherein the proximal portion of the anchor is shaped to define the appendages by virtue of being shaped to define respective grooves beneath the appendages.
10. The apparatus according to claim 9 , wherein, prior to the removal of the constraining force, the appendages do not extend radially more than does any other portion of the anchor.
11. The apparatus according to claim 1 , wherein, following the expansion of the appendages, an angle between each of the appendages and a longitudinal axis of the proximal portion of the anchor is between 5 and 60 degrees.
12. A method, comprising:
delivering a tissue anchor, which is radially constrained within a tube and is coupled to a thread, to a proximal side of tissue of a subject;
piercing the tube through the tissue to a distal side of the tissue; and
subsequently to piercing the tube through the tissue, anchoring the thread at the tissue, by pushing the anchor from the tube such that one or more appendages at a proximal portion of the anchor expand radially within the tissue, and a plurality of strips, which join the proximal portion of the anchor to a distal portion of the anchor, expand radially to form respective loops at the distal side of the tissue.
13. The method according to claim 12 , wherein the thread passes at least partly through the anchor.
14. The method according to claim 13 , wherein the anchor is coupled to the thread by virtue of the thread being knotted distally to the anchor.
15. The method according to claim 12 , wherein the anchor is coupled to the thread by virtue of the thread being attached to an inner wall of the distal portion of the anchor.
16. The method according to claim 12 , wherein the strips consist of 2-8 strips.
17. The method according to claim 12 , wherein the proximal portion of the anchor is shaped to define the appendages by virtue of being shaped to define respective grooves beneath the appendages.
18. The method according to claim 12 , wherein, while the tissue anchor is radially constrained within the tube, the appendages do not extend radially more than does any other portion of the anchor.
19. The method according to claim 12 , wherein, following the expansion of the appendages, an angle between each of the appendages and a longitudinal axis of the proximal portion of the anchor is between 5 and 60 degrees.