Right ventricular papillary approximation
A device for treating tricuspid regurgitation includes a shaft and a first fixation mechanism disposed on a distal end of the shaft. The first fixation mechanism is configured to anchor the device to a first cardiac tissue. The device includes a second fixation mechanism disposed on a proximal end of the shaft. The second fixation mechanism is configured to anchor the device to a second cardiac tissue. The device includes an approximation mechanism connecting the first fixation mechanism and the second fixation mechanism, wherein the approximation mechanism causes the second fixation mechanism to move along the shaft toward the first fixation mechanism to approximate the first cardiac tissue and the second cardiac tissue.
1. A device for treating tricuspid regurgitation, the device comprising:
a shaft;
a first fixation mechanism disposed on a distal end of the shaft, wherein the first fixation mechanism is configured to anchor the device to a first cardiac tissue, wherein the first fixation mechanism is configured to be folded against the shaft to be substantially parallel to the shaft in a closed configuration, and to be expanded outward from the shaft in an open configuration;
a second fixation mechanism disposed on a proximal end of the shaft, wherein the second fixation mechanism is configured to anchor the device to a second cardiac tissue, wherein the second fixation mechanism is configured to be folded against the shaft to be substantially parallel to the shaft in a closed configuration, and to be expanded outward from the shaft in an open configuration;
a locking mechanism to lock the first and second fixation mechanisms in the open configurations, the locking mechanism comprising a first tube arranged around the shaft, a second tube arranged around the first tube, and a spring configured to cause the first tube to close around the shaft to lock the first and second fixation mechanisms in the open configurations; and
an approximation mechanism connecting the first fixation mechanism and the second fixation mechanism, wherein the approximation mechanism causes the second fixation mechanism to move along the shaft toward the first fixation mechanism to approximate the first cardiac tissue and the second cardiac tissue.
2. The device of claim 1 , wherein the approximation mechanism includes at least one of a string, a wire, and a thread.
3. The device of claim 1 , wherein the locking mechanism is configured to lock the device in a configuration that causes the first cardiac tissue and the second cardiac tissue to be approximated together.
4. The device of claim 3 , wherein the first tube of the locking mechanism comprises a hook to engage a ratchet along the shaft.
5. The device of claim 1 , further comprising a sheath configured to contain the shaft, and wherein the first and second fixation mechanism are collapsed to be substantially parallel to the shaft when the shaft is contained within the sheath.
6. The device of claim 1 , wherein the first cardiac tissue is at least one of papillary muscle and right ventricular free wall, and the second cardiac tissue is ventricular septal tissue.
7. The device of claim 1 , wherein the shaft includes an actuator.
8. The device of claim 1 , wherein the approximation mechanism causes the second fixation mechanism to move along the shaft toward the first fixation mechanism such that at least a portion of the shaft is not between the first fixation mechanism and the second fixation mechanism.
9. The device of claim 1 , wherein:
the first fixation mechanism is configured to expand outwardly from the shaft to anchor the device to the first cardiac tissue, and
the second fixation mechanism is configured to expand outwardly from the shaft to anchor the device to the second cardiac tissue.
10. The device of claim 1 , wherein the approximation mechanism is configured to be pulled to cause the second fixation mechanism to move along the shaft toward the first fixation mechanism.
11. The device of claim 1 , wherein the shaft comprises a thread, and the first tube comprises a hook configured to be pushed against the thread of the shaft to lock the first and second fixation mechanism in the open configurations.
12. The device of claim 11 , wherein the spring is positioned between the hook and the second tube.
13. The device of claim 12 , wherein the first tube comprises a proximal end and a distal end, the proximal end of the first tube comprising the hook of the first tube, and the distal end of the first tube being engageable with a control device to decouple the first tube and the shaft.
14. The device of claim 1 , wherein:
the first fixation mechanism comprises first and second hook members, the first and second hook members of the first fixation mechanism extending outwardly from the shaft toward the proximal end of the shaft, and
the second fixation mechanism comprises first and second hook members, the first and second hook members of the second fixation mechanism extending outwardly from the shaft toward the distal end of the shaft.