Mitral valve annuloplasty device with twisted anchor
The present invention relates to a tissue shaping device adapted to be disposed in a vessel near a patient's heart to reshape the patient's heart. The device comprises a first anchor and a second anchor adapted to be deployed by a catheter to engage a vessel wall while the first anchor is adapted to resist the compression of a first part of the first anchor and resist the expansion of a second part of the first anchor in response to a compressive force on the first part.
1. A mitral valve therapy device, the therapy device comprising:
an expandable first anchor, an expandable second anchor, and an elongate body extending therebetween, the expandable first anchor having an anchored configuration,
the expandable first anchor comprising a first segment and a second segment, the first segment extending from a distal end of the first anchor to a proximal end of the first anchor, the second segment extending from a distal end of the first anchor to a proximal end of the first anchor, and in the anchored configuration the first segment engages the second segment in an axially central location between the distal end of the first anchor and the proximal end of the first anchor to form at least one full twist around the second segment in which the first segment passes over the second segment and then under the second segment and in which the second segment passes under the first segment and then over the first segment.
2. The device of claim 1 , wherein the expandable first anchor further comprises a securing member for securing an end of the first segment and an end of the second segment therein at a distal end of the securing member, the securing member generally aligned with the elongate body.
3. The device of claim 2 , wherein the first segment forms a loop around the elongate body proximal to the securing member, and the second segment extends from the loop to the distal end of the expandable first anchor.
4. The device of claim 2 , wherein the elongate body extends into a proximal end of the securing member.
5. The device of claim 1 , further comprising a lock that locks the expandable first anchor in the anchored configuration.
6. The device of claim 1 , wherein the expandable first anchor is adapted to self-expand when deployed from a delivery member.
7. The device of claim 1 , wherein the first and second segments each comprise a bending region formed therein at a region of increased curvature that is configured such that the first and second segments preferentially bend at the bending regions during expansion and collapse.
8. The device of claim 1 , wherein the expandable second anchor has an anchored configuration, the expandable second anchor comprising a second anchor first segment and a second anchor second segment, and in the anchored configuration of the expandable second anchor the second anchor first segment engages the second anchor second segment to form at least one full twist around the second anchor second segment in a central portion of the expandable second anchor in which the second anchor first segment passes over the second anchor second segment and then under the second anchor second segment and in which the second anchor second segment passes under the second anchor first segment and then over the second anchor first segment.