System and method for reducing tricuspid regurgitation

1. A method for use at a tricuspid valve of a heart of a subject, the tricuspid valve having an annulus and being disposed between a right atrium and a right ventricle of the heart, the heart having a coronary sinus, and the method comprising:

using a first delivery device:

transluminally advancing a first anchor to the coronary sinus, and

anchoring the first anchor inside the coronary sinus;

using a second delivery device:

transluminally advancing a second anchor to the right atrium, the second anchor including a proximal portion, a center portion, and a distal portion that is pivotally coupled to the center portion, and

anchoring the second anchor at a site that is across the annulus from the coronary sinus by:

while the distal portion is disposed adjacent and parallel to the center portion, driving the distal portion from the right atrium, through the annulus at the site, and into the right ventricle,

seating the distal portion against a ventricular surface of the annulus such that (i) the distal portion is disposed perpendicular to the center portion, (ii) the center portion extends through the annulus, and (iii) the proximal portion is disposed in the right atrium;

while the first anchor remains anchored inside the coronary sinus and the second anchor remains anchored to the site, reducing a distance between the first and second anchors by applying tension to a tensioning member coupled to (i) the proximal portion of the second anchor and (ii) the first anchor; and

maintaining the tension by locking a lock member to the tensioning member.

2. The method according to claim 1 , further comprising sliding the lock member along the tensioning member to the right atrium subsequently to anchoring the second anchor at the site.

3. The method according to claim 1 , further comprising, prior to anchoring the second anchor, forming an aperture at the site by puncturing the annulus with a wire, and wherein driving the distal portion through the annulus at the site comprises driving the distal portion through the aperture.

4. The method according to claim 1 , wherein:

transluminally advancing the second anchor to the right atrium comprises transluminally advancing the second anchor to the right atrium while the second anchor is disposed within the second delivery device, with the distal portion disposed adjacent and parallel to the center portion, and

anchoring the second anchor at the site comprises exposing the second anchor from the second delivery device such that the distal portion pivots automatically to become disposed perpendicular to the center portion.

5. The method according to claim 1 , wherein the tricuspid valve has an anterior leaflet, a septal leaflet, and a posterior leaflet, and wherein reducing the distance between the first and second anchors comprises reducing the distance between the first and second anchors such that the posterior leaflet becomes in effect eliminated.

6. The method according to claim 1 , wherein:

advancing the first anchor comprises advancing the first anchor while the first anchor is collapsed around a deflated balloon of a balloon catheter of the first delivery device, and

anchoring the first anchor comprises plastically expanding the first anchor within the coronary sinus by inflating the balloon.

7. The method according to claim 1 , wherein:

the tensioning member is a second tensioning member, and is coupled to the first anchor via a first tensioning member,

reducing the distance comprises reducing the distance by applying tension to the first and second tensioning members, and

maintaining the tension comprises maintaining the tension by locking the lock member to the first and second tensioning members.

8. The method according to claim 7 , wherein locking the lock member to the first and second tensioning members comprises locking the lock member to the first and second tensioning members such that the lock becomes implanted in the right atrium.

9. The method according to claim 1 , wherein anchoring the first anchor inside the coronary sinus comprises anchoring the first anchor inside the coronary sinus prior to transluminally advancing the second anchor to the right atrium.

10. The method according to claim 9 , wherein anchoring the first anchor inside the coronary sinus comprises anchoring the first anchor inside the coronary sinus with the tensioning member coupled to the first anchor, and wherein transluminally advancing the second anchor to the right atrium comprises sliding the second anchor over the tensioning member toward the right atrium.

11. The method according to claim 10 , wherein locking the lock member to the tensioning member comprises locking the lock member to the tensioning member such that the second anchor is disposed, on the tensioning member, between the lock member and the first anchor.

12. The method according to claim 1 , wherein:

transluminally advancing the first anchor to the coronary sinus comprises transluminally advancing the first anchor to the coronary sinus while the first anchor is maintained in a collapsed state within the first delivery device, and

anchoring the first anchor comprises radially expanding the first anchor within the coronary sinus.

13. The method according to claim 12 , wherein anchoring the first anchor comprises ejecting the first anchor from the first delivery device within the coronary sinus such that the first anchor self-expands within the coronary sinus.

14. A method of treatment at a tricuspid valve of a heart of a subject, the tricuspid valve having an annulus and being disposed between a right atrium and a right ventricle of the heart, the heart having a coronary sinus, and the method comprising:

transluminally advancing a first anchor to the coronary sinus and anchoring the first anchor inside the coronary sinus;

transluminally advancing a second anchor to the right atrium while the second anchor is disposed within a delivery device, the second anchor including a proximal portion, a center portion, and a distal portion, and

anchoring the second anchor at a site that is across the annulus from the coronary sinus by:

driving the distal portion from the right atrium into the annulus at the site, and

exposing the second anchor from the delivery device such that the distal portion pivots automatically to become disposed orthogonal to the center portion;

while the first anchor remains anchored inside the coronary sinus and the second anchor remains anchored to the site, reducing a distance between the first and second anchors by applying tension to a tensioning member coupled to (i) the proximal portion of the second anchor and (ii) the first anchor; and

maintaining the tension by locking a lock member to the tensioning member.

15. The method according to claim 14 , further comprising sliding the lock member along the tensioning member to the right atrium subsequently to anchoring the second anchor at the site.

16. The method according to claim 14 , further comprising, prior to anchoring the second anchor, forming an aperture at the site by puncturing the annulus with a wire, and wherein driving the distal portion through the annulus at the site comprises driving the distal portion through the aperture.

17. The method according to claim 14 , wherein the tricuspid valve has an anterior leaflet, a septal leaflet, and a posterior leaflet, and wherein reducing the distance between the first and second anchors comprises reducing the distance between the first and second anchors such that the posterior leaflet becomes in effect eliminated.

18. The method according to claim 14 , wherein:

advancing the first anchor comprises advancing the first anchor while the first anchor is collapsed around a deflated balloon of a balloon catheter, and

anchoring the first anchor comprises plastically expanding the first anchor within the coronary sinus by inflating the balloon.

19. The method according to claim 14 , wherein:

the tensioning member is a second tensioning member, and is coupled to the first anchor via a first tensioning member,

reducing the distance comprises reducing the distance by applying tension to the first and second tensioning members, and

maintaining the tension comprises maintaining the tension by locking the lock member to the first and second tensioning members.