Transverse helical cardiac anchor for minimally invasive heart valve repair
Disclosed herein are various embodiments of cardiac anchors configured to be inserted into a heart wall of a patient to anchor a suture as an artificial chordae under an appropriate tension for proper valve function. Such cardiac anchors are particularly suitable for use in intravascular, transcatheter procedures.
1. A method of anchoring a suture in a heart of a patient as an artificial chordae, comprising:
intravascularly accessing the heart;
inserting a suture into a heart valve leaflet of the heart;
attaching a portion of the suture to a cardiac anchor, the cardiac anchor including an actuation head at a proximal end of an anchor body, a coil extending distally of the anchor body having a distal tip, a flexible shaft extending from the anchor body distally through the coil, and a blunt tip at a distal end of the flexible shaft;
advancing the anchor to a heart wall of the heart with an anchor delivery catheter;
engaging an actuation mechanism with the actuation head to rotate the anchor;
actuating the anchor to drive the blunt tip against the heart wall to cause the flexible shaft to flex against the heart wall and orient the coil generally parallel with the heart wall;
further actuating the anchor to rotate the coil and cause the distal tip of the coil to transversely enter the heart wall such that further rotation of the coil causes the coil to become embedded in and along the heart wall.
2. The method of claim 1 , wherein the flexible shaft limits an insertion depth of the coil into the heart wall.
3. The method of claim 1 , wherein the flexible shaft defines a maximum insertion depth of the coil into the heart wall.
4. The method of claim 1 , wherein the flexible shaft is configured as a coil.
5. The method of claim 1 , wherein the blunt tip is configured as a spherical ball.
6. The method of claim 1 , wherein the coil defines a threaded exterior on the anchor body.
7. The method of claim 1 , wherein the coil defines a series of coil turns configured such that only a portion of each coil turn is embedded in the heart wall.
8. The method of claim 1 , wherein the blunt tip is configured to contact the heart wall without penetrating tissue of the heart wall.
9. The method of claim 1 , wherein intravascularly accessing the heart includes accessing the left ventricle of the heart.
10. The method of claim 9 , wherein accessing the left ventricle of the heart includes transseptal access to the left atrium.
11. A method of anchoring a suture in a heart of a patient as an artificial chordae, comprising:
intravascularly accessing the heart;
inserting a suture into a heart valve leaflet of the heart;
attaching a portion of the suture to a cardiac anchor, the cardiac anchor including an actuation head at a proximal end of an anchor body a coil extending distally of the anchor body having a distal tip;
advancing the anchor to a heart wall of the heart with an anchor delivery catheter;
engaging an actuation mechanism with the actuation head to rotate the anchor;
actuating the anchor to orient the coil generally parallel with the heart wall;
further actuating the anchor to rotate the coil and cause the distal tip of the coil to transversely enter the heart wall such that further rotation of the coil causes the coil to become embedded in and along the heart wall.
12. The method of claim 11 , wherein the coil defines a threaded exterior on the anchor body.
13. The method of claim 11 , wherein the coil defines a series of coil turns configured such that causing the coil to become embedded in and along the heart wall causes only a portion of each coil turn to be embedded in the heart wall.
14. The method of claim 11 , wherein intravascularly accessing the heart includes accessing the left ventricle of the heart.
15. The method of claim 14 , wherein accessing the left ventricle of the heart includes transseptal access to the left atrium.
16. The method of claim 11 , wherein actuating the anchor to orient the coil generally parallel with the heart wall includes driving a blunt tip of a flexible shaft extending from the anchor body distally through the coil against the heart wall to cause the flexible shaft to flex against the heart wall to orient the coil generally parallel with the heart wall.
17. The method of claim 16 , wherein the flexible shaft limits an insertion depth of the coil into the heart wall.
18. The method of claim 16 , wherein the flexible shaft defines a maximum insertion depth of the coil into the heart wall.
19. The method of claim 16 , wherein the blunt tip is configured as a spherical ball.
20. The method of claim 16 , wherein the blunt tip is configured to contact the heart wall without penetrating tissue of the heart wall.