Prosthetic cardiac valve devices, systems, and methods
A system for treating a diseased native valve in a patient includes a valve prosthesis and a delivery device. The prosthesis includes an anchor and a frame. The delivery device includes an outer sheath, an inner shaft, an anchor guide, and a tether. The anchor is shaped to encircle chordae or leaflets of a native valve. The frame is configured to sit within the anchor. The inner shaft is positioned within the outer sheath and translatable and rotatable relative to the outer sheath. The anchor guide is attached to a distal end of the inner shaft and has a curved distal section. The tether is configured to detachably couple to the anchor and to longitudinally translate the anchor within the inner shaft and anchor guide. The anchor is configured to be actuated from a delivery configuration to the deployed configuration when the anchor is translated out of the anchor guide.
1. A delivery system for delivering a prosthesis to a diseased native valve of a heart, the delivery system comprising:
an outer sheath;
an inner shaft within the outer sheath, the inner shaft translatable and rotatable relative to the outer sheath;
an anchor having an elongated delivery configuration and a deployed spiral configuration configured to encircle chordae or leaflets of the diseased native valve;
an anchor guide attached to a distal end of the inner shaft, the anchor guide configured to house the anchor in the elongated delivery configuration, the anchor guide comprising a proximal straight section having a central axis and a distal section shape-set to bend into a tapered spiral shape extending around the central axis and distally from the proximal straight section into a distal plane orthogonal to the central axis; and
an actuator configured to release the anchor from the delivery configuration in the anchor guide into a deployed spiral configuration within the heart;
wherein the inner shaft and anchor guide are configured to rotate relative to the outer sheath so as to rotate the anchor in the deployed spiral configuration about the central axis to encircle chordae of the native valve.
2. The delivery system of claim 1 , further comprising a tether configured to extend through the inner shaft and anchor guide, the tether configured to attach to the anchor.
3. The delivery system of claim 1 , wherein the outer sheath is steerable.
4. The delivery system of claim 1 , wherein the anchor guide is configured to correctly orient the anchor relative to the central axis in order to facilitate concentric wrapping of the anchor relative to the inner shaft as the anchor is deployed from the anchor guide.
5. The delivery system of claim 1 , wherein the distal section is further configured to transition continuously from a high pitch, low radius curve at a proximal end to a low pitch, high radius curve at a distal end.
6. The delivery system of claim 1 , wherein a curvature of the distal section is configured to match a curvature of the anchor in the deployed spiral configuration of the anchor.
7. The delivery system of claim 1 , wherein the inner shaft and the anchor guide are of unitary construction.
8. The delivery system of claim 1 , wherein the distal section is further configured to be coplanar with the anchor in the deployed spiral configuration of the anchor.
9. The delivery system of claim 2 , wherein the tether is configured to hold the anchor while a valve frame is expanded within the spiral deployed configuration of the anchor.
10. The delivery system of claim 1 , wherein the inner shaft and anchor guide are configured to rotate the anchor in the deployed spiral configuration within the plane.
11. The delivery system of claim 1 , wherein the spiral shape extends greater than 360°.
12. The delivery system of claim 1 , wherein the anchor guide is further configured to maintain the anchor in a deployed spiral configuration on a first side of the native valve.
13. The delivery system of claim 12 , wherein the first side of the native valve is facing an atrium of the heart.
14. The delivery system of claim 1 , wherein the anchor guide is configured to maintain a central axis of the anchor in the anchor's deployed configuration co-axial with the central axis of the anchor guide.