Atrioventricular valve repair
Apparatus and methods are described for use with an annuloplasty ring ( 20 ), and an atrioventricular valve of a heart of a mammalian subject, the atrioventricular valve including a valve annulus, valve leaflets, chords, and papillary muscles. A plurality of chord-manipulation arms ( 26 ) are configured to be deployed among the chords of the atrioventricular valve, and to cause a size of the valve annulus to decrease, by the chord-manipulation arms ( 26 ) being rotated such as to twist the native atrioventricular valve and pull the native atrioventricular valve radially inwards, by the chord-manipulation arms ( 26 ) deflecting the chords. The chord-manipulation arms ( 26 ) are configured to subsequently provide a counterforce against which the annuloplasty ring ( 20 ) is pushed, during implantation of the annuloplasty ring ( 20 ). Other applications are also described.
1. Apparatus for treating an atrioventricular valve of a heart of a mammalian subject, the atrioventricular valve including a valve annulus and valve leaflets between an atrium of a heart and a ventricle of the heart, chords, and papillary muscles, the apparatus comprising:
an annuloplasty ring configured for implantation on the valve annulus in the atrium; and
a plurality of chord-manipulation arms configured:
for deployment, in the ventricle, among the chords of the atrioventricular valve;
subsequently, to cause a size of the valve annulus to decrease, by rotating such as to twist the native atrioventricular valve and pull the native atrioventricular valve radially inwards, by deflecting the chords; and
subsequently, to provide a counterforce, toward the atrium, against the annuloplasty ring during the implantation of the annuloplasty ring,
wherein at least portions of the chord-manipulation arms are configured to remain under the atrioventricular valve leaflets and the annuloplasty ring is configured to become anchored to the portions of the chord-manipulation arms;
wherein the portions are first portions, wherein the chord-manipulation arms further comprise second portions, and wherein the first portions of the chord-manipulation arms are configured to be detachable from the second portions of the chord-manipulation arms, and are configured to remain under the atrioventricular valve leaflets even after the second portions of the chord-manipulation arms are removed from the subject's ventricle.
2. The apparatus according to claim 1 , wherein the chord-manipulation arms are configured, subsequently to the implantation, to untwist the native atrioventricular valve by rotating in an opposite direction to the direction of the rotation of the chord-manipulation arms that caused the native atrioventricular valve to become twisted.
3. The apparatus according to claim 1 , wherein the atrioventricular valve includes a mitral valve, and the chord-manipulation arms are configured for deployment among chords of the mitral valve.
4. The apparatus according to claim 1 , wherein the atrioventricular valve includes a tricuspid valve, and the chord-manipulation arms are configured for deployment among chords of the tricuspid valve.
5. The apparatus according to claim 1 , wherein the chord-manipulation arms are sized such that, when disposed in radially-non-constrained configurations, the chord-manipulation arms span a diameter that is at least equal to an inner diameter of the annuloplasty ring, such that the chord-manipulation arms are configured to provide the counterforce during the implantation of the annuloplasty ring.
6. The apparatus according to claim 1 , wherein the chord-manipulation arms are sized such that, when disposed in radially-non-constrained configurations, the chord-manipulation arms are configured to overlap radially with the annuloplasty ring, such that the chord-manipulation arms are configured to provide the counterforce during the implantation of the annuloplasty ring.
7. The apparatus according to claim 1 , wherein at least a portion of an inner edge of each of the chord-manipulation arms is concavely curved in a given circumferential direction, and wherein the chord-manipulation arms are configured to pull the native atrioventricular valve radially inwards, by rotating in the given circumferential direction.
8. The apparatus according to claim 1 , wherein the annuloplasty ring comprises a plurality of anchoring elements, and wherein at least some of the anchoring elements are configured to become embedded in the chord-manipulation arms.
9. The apparatus according to claim 1 , further comprising a frame configured to extend from the ventricle into the atrium of the subject's heart, the frame defining holes which are sized such as to allow blood to flow from the atrium to the ventricle of the subject's heart via the frame, and wherein the chord-manipulation arms are coupled to a portion of the frame that is configured to be disposed within the ventricle.
10. The apparatus according to claim 1 ,
further comprising a support rod and a hollow tube that define holes,
wherein the chord-manipulation arms are coupled to the support rod and the support rod is configured to be disposed inside the hollow tube, and
wherein the holes within the hollow tube are sized such as to allow blood to flow from the atrium of the subject's heart to the ventricle of the subject's heart via the hollow tube.
11. The apparatus according to claim 10 , further comprising a unidirectional valve disposed within the hollow tube, and configured to allow blood flow from the atrium to the ventricle, but to block blood flow in the opposite direction.
12. The apparatus according to claim 1 , further comprising a delivery device configured to deliver the chord-manipulation arms to the ventricle of the subject's heart, wherein the arms are disposed at an angle of between 45 degrees and 135 degrees with respect to a longitudinal axis of a distal-most portion of the delivery device.
13. The apparatus according to claim 1 , further comprising a plurality of support elements, wherein each of the chord-manipulation arms is coupled to a respective one of the support elements, and wherein, during the deployment of the arms inside the ventricle, the support elements are configured to separate from each other.
14. A method for use with an annuloplasty ring, and an atrioventricular valve of a heart of a mammalian subject, the atrioventricular valve including a valve annulus and valve leaflets between an atrium of a heart and a ventricle of the heart, chords, and papillary muscles, the method comprising:
deploying a plurality of chord-manipulation arms in the ventricle among the chords of the atrioventricular valve;
subsequently rotating the arms, such that the arms cause a size of the valve annulus to decrease, by the arms twisting the native atrioventricular valve and pulling the native atrioventricular valve radially inwards, by deflecting the chords; and
subsequently, implanting the annuloplasty ring on the valve annulus in the atrium, while using the arms (a) to maintain the size of the valve annulus at its decreased size, by maintaining the arms in their rotated state, and (b) to provide a counterforce, toward the atrium, against the annuloplasty ring, by pulling the arms from beneath the valve leaflets toward the annuloplasty ring.
15. The method according to claim 14 , further comprising, subsequent to implanting the annuloplasty ring on the valve annulus, allowing the native atrioventricular valve to become untwisted by rotating the chord-manipulation arms in an opposite direction to the direction of the rotation of the chord-manipulation arms that caused the native atrioventricular valve to become twisted.
16. The method according to claim 14 , wherein the atrioventricular valve includes a mitral valve, and deploying the plurality of chord-manipulation arms among the chords of the atrioventricular valve comprises deploying the plurality of chord-manipulation arms among chords of the mitral valve.
17. The method according to claim 14 , wherein the atrioventricular valve includes a tricuspid valve, and deploying the plurality of chord-manipulation arms among the chords of the atrioventricular valve comprises deploying the plurality of chord-manipulation arms among chords of the tricuspid valve.
18. The method according to claim 14 , wherein deploying the plurality of chord-manipulation arms among the chords of the atrioventricular valve comprises deploying the arms among the chords of the atrioventricular valve such that the arms span a diameter that is at least equal to an inner diameter of the annuloplasty ring, such that the arms are configured to provide a counterforce against which the annuloplasty ring is pushed, during implantation of the annuloplasty ring.
19. The method according to claim 14 , wherein deploying the plurality of chord-manipulation arms among the chords of the atrioventricular valve comprises deploying the arms among the chords of the atrioventricular valve such that the arms overlap radially with the annuloplasty ring, such that the arms are configured to provide a counterforce against which the annuloplasty ring is pushed, during implantation of the annuloplasty ring.