Device and method for releasing catheters from cardiac structures
Devices, systems, and methods for releasing a catheter from an implant may include a catheter comprising first and second elongate elements, first and second elongate element lumens, a tissue anchor lumen, apertures corresponding to each of the lumens, and retaining portions between adjacent apertures. The first elongate element may extend out of its lumen through the first elongate element aperture, across the retaining portion transversely with respect to a longitudinal axis, and towards the second elongate element aperture. The first elongate element may then extend into the second elongate element aperture, loop over the second elongate element, and extend back across the retaining portion and into the first elongate element lumen. In some instances, the second elongate element is retracted to uncouple the first and second elongate elements from each other and to open a channel for the release of tethered tissue anchors.
1. A catheter comprising:
a plurality of apertures, the plurality of apertures including at least a first elongate element aperture and a second elongate element aperture adjacent to each other;
a first elongate element within a first elongate element lumen; and
a second elongate element within a second elongate element lumen,
wherein for the pair of adjacent first and second elongate element apertures, the first elongate element extends out of the first elongate element lumen through the first elongate element aperture into the second elongate element aperture, loops over the second elongate element, and extends back into the first elongate element lumen.
2. The catheter of claim 1 , wherein the first elongate element is releasably coupled to the second elongate element.
3. The catheter of claim 1 , wherein the first elongate element extending between the first and second elongate element apertures crosses over itself.
4. The catheter of claim 1 , wherein the first elongate element is configured to be retracted from the first elongate lumen via a first elongate element control and the second elongate element is configured to be retracted from the second elongate lumen via a second elongate element control.
5. The catheter of claim 4 , wherein retracting the first elongate element from the first elongate lumen tensions the first elongate element.
6. The catheter of claim 1 , further comprising a retaining portion between the pair of adjacent first and second elongate element apertures.
7. The catheter of claim 6 , wherein the retaining portion comprises a channel along a longitudinal axis.
8. The catheter of claim 7 , wherein the channel is adapted to be in at least one of a closed configuration and an open configuration.
9. The catheter of claim 8 , wherein the channel is adapted to be in the closed configuration when the first elongate element is looped and tensioned against the second elongate element.
10. The catheter of claim 8 , wherein the channel is adapted to be in the open configuration when the first elongate element is uncoupled from the second elongate element.
11. The catheter of claim 1 , wherein the plurality of apertures are configured for passage of a plurality of tissue anchors.
12. The catheter of claim 1 , further comprising at least one radiopaque structure located between the plurality of apertures.
13. A method for performing a procedure inside a heart comprising:
positioning a catheter adjacent to heart tissue,
wherein the catheter comprises a plurality of apertures including at least a first elongate element aperture and a second elongate element aperture adjacent to each other, a first elongate element within a first elongate element lumen, a second elongate element within a second elongate element lumen,
wherein for the pair of adjacent first and second elongate element apertures, the first elongate element extends out of the first elongate element lumen through the first elongate element aperture into the second elongate element aperture, loops over the second elongate element, and extends back into the first elongate element lumen;
deploying a first tissue anchor and at least a second tissue anchor into the heart tissue, wherein a tether couples the first tissue anchor to at least the second tissue anchor; and
retracting the second elongate element from the second elongate element lumen to uncouple the first elongate element from the second elongate element and to open a channel for passage of the first and second tissue anchors, wherein the catheter comprises a retaining portion including the channel between the pair of adjacent first and second elongate element aperture.
14. The method of claim 13 , wherein retracting the second elongate element increases a slack of the first elongate element.
15. The method of claim 13 , further comprising crossing the first elongate element over itself.
16. The method of claim 13 , further comprising tensioning the first elongate element against the second elongate element.
17. The method of claim 13 , further comprising tensioning the uncoupled first elongate element to remove a slack in the first elongate element.
18. The method of claim 13 , further comprising indirectly visualizing the catheter.
19. The method of claim 13 , further comprising advancing an anchor delivery catheter within the catheter.