Annuloplasty implants
An annuloplasty implant is provided for treating a native atrioventricular valve of a patient, the annuloplasty implant including a plurality of tissue anchors, which are configured to anchor the annuloplasty implant around at least a portion of a valve annulus of the native atrioventricular valve. The annuloplasty further includes a contracting assembly, which includes an elongate contracting member; and a contracting mechanism, which is coupled to the elongate contracting member, and which is configured, upon actuation thereof, to apply a longitudinal contracting force to the elongate contracting member that longitudinally contracts at least a portion of the annuloplasty implant, thereby circumferentially tightening the valve annulus. The annuloplasty further includes a force-distributing element, which includes a longitudinally-non-compressible tightly-coiled element, and which is configured to distribute the longitudinal contracting force over at least two of the tissue anchors. Other embodiments are also described.
1. A system for treating a native valve of a patient, the system comprising:
a plurality of tissue anchors, which are configured to be inserted into tissue around at least a portion of a valve annulus of the native valve;
a contracting system, which comprises:
an elongate contracting member;
a contracting mechanism, which is configured to be:
coupled to the elongate contracting member, and
upon actuation thereof, to apply a longitudinal tensioning force to the elongate contracting member such that the plurality of anchors are pulled closer together to circumferentially tighten the valve annulus; and
a locking bead, which is configured to lock the contracting member in a tensioned state; and
a force-distributing element comprising a tightly-coiled element and being configured to distribute the longitudinal tensioning force over at least two of the tissue anchors.
2. The system according to claim 1 , wherein the force-distributing element is rigid along a longitudinal axis thereof and flexible along a plane perpendicular to the longitudinal axis.
3. The system according to claim 1 , wherein the force-distributing element is configured to distribute the longitudinal contracting force over exactly two of the tissue anchors.
4. The system according to claim 1 , wherein the force-distributing element is disposed in a vicinity of an end of the contracting member.
5. The system according to claim 1 , wherein the force-distributing element is cylindrical.
6. The system according to claim 1 , wherein the contracting mechanism comprises a structure that is shaped so as to define an opening therethrough, and wherein the contracting mechanism is configured, upon the actuation thereof, to draw the contracting member through the opening.
7. The system according to claim 1 , wherein each tissue anchor of the plurality of tissue anchors comprises:
a tissue-coupling element; and
an anchor head, which is fixed to the tissue-coupling element, and which is shaped so as to define an engaging opening that passes entirely through the anchor head.
8. The system according to claim 7 , wherein, for each of the tissue anchors, the engaging opening passes entirely through the anchor head along a central longitudinal axis of the tissue anchor.
9. The system according to claim 7 , wherein the engaging opening is at least partially non-circular.
10. The system according to claim 1 , wherein the force-distributing element is rigid along a longitudinal axis thereof and flexible along a plane perpendicular to the longitudinal axis.
11. The system according to claim 1 , wherein the force-distributing element is cylindrical.
12. The system according to claim 1 , wherein the elongate contracting member comprises at least one wire.
13. The system according to claim 1 , wherein the contracting mechanism comprises at least one of a rotatable structure and a ratchet contracting mechanism.
14. A system for treating a native valve of a patient, the system comprising:
a plurality of tissue anchors, which are configured to be inserted into tissue around at least a portion of a valve annulus of the native valve;
a contracting system, which comprises:
an elongate contracting member; and
a contracting mechanism comprising a ratchet, the contracting mechanism coupled to the elongate contracting member, and configured, upon actuation thereof, to apply a longitudinal tensioning force to the elongate contracting member such that the plurality of anchors are pulled closer together to circumferentially tighten the valve annulus; and
a force-distributing element comprising a tightly-coiled element and being configured to distribute the longitudinal tensioning force over at least two of the tissue anchors.
15. The system according to claim 14 , wherein the contracting system further comprises a locking bead, which is configured to lock the contracting member in a tensioned state.
16. The system according to claim 14 , wherein the force-distributing element is disposed in a vicinity of an end of the contracting member.
17. The system according to claim 14 , wherein the contracting mechanism comprises a structure that is shaped so as to define an opening therethrough, and wherein the contracting mechanism is configured, upon the actuation thereof, to draw the contracting member through the opening.
18. The system according to claim 14 , wherein each tissue anchor of the plurality of tissue anchors comprises:
a tissue-coupling element; and
an anchor head, which is fixed to the tissue-coupling element, and which is shaped so as to define an engaging opening that passes entirely through the anchor head.