Rolled prosthetic valve support
Apparatus is provided for use at a native valve of a heart of a subject. The apparatus includes a delivery tube, transluminally advanceable to the heart; and a prosthetic valve support, configured to support a prosthetic valve at the native valve, and comprising an upstream support portion. The upstream support portion has a working configuration in which it is generally annular and has (1) a tissue-contacting side configured to be placed against an atrial surface of the native valve, and (2) an opposing side, and defines an opening therebetween. The upstream support portion also has a delivery configuration in which the upstream support portion is rolled up to define a channel, and is disposed within the delivery tube. The upstream support portion is configured to be transitioned from the delivery configuration to the working configuration by being exposed from the delivery tube, and unrolled.
1. Apparatus for use with a prosthetic valve at a native valve of a heart of a subject, the apparatus comprising:
a delivery tube, transluminally advanceable to the heart of the subject; and
a prosthetic valve support, configured to support the prosthetic valve at the native valve, and defining an upstream support portion, the upstream support portion being a generally annular disc, and:
having a working configuration in which the upstream support portion is a generally annular disc that has (1) a tissue-contacting side configured to be placed against an atrial surface of the native valve, and (2) an opposing side, and defines an opening therebetween,
having a delivery configuration in which the upstream support portion is rolled up to create a channel having a central longitudinal axis, and is disposed within the delivery tube, and
being configured to be transitioned from the delivery configuration to the working configuration by being exposed from the delivery tube, and unrolled.
2. The apparatus according to claim 1 , wherein, in the delivery configuration, the upstream support portion has a distal portion and a proximal portion, and shapes the channel to be an uninterrupted lumen between the distal portion and the proximal portion.
3. The apparatus according to claim 1 , wherein the delivery tube is configured to retain the upstream support portion in the delivery configuration, and the upstream support portion is configured to automatically transition toward the working configuration by automatically unrolling upon becoming exposed from the delivery tube.
4. The apparatus according to claim 1 , wherein, while the upstream support portion is in the delivery configuration, at any given part of the upstream support portion, the opposing side of the upstream support portion is disposed closer to the central longitudinal axis than is the tissue-contacting side.
5. The apparatus according to claim 1 , wherein, while the upstream support portion is in the delivery configuration, the central longitudinal axis of the channel is collinear with a central longitudinal axis of the delivery tube.
6. A method for use with a prosthetic valve at a native valve of a heart of a subject, comprising:
transluminally advancing, to a heart valve of the subject, a prosthetic valve support that defines an upstream support portion, the advancing being while the upstream support portion is in a delivery configuration in which the upstream support portion (i) is rolled up to create a channel having a central longitudinal axis, and (ii) is disposed within a delivery tube;
subsequently, facilitating transition of the upstream support portion into a working configuration by exposing the upstream support portion from the delivery tube and facilitating unrolling of the upstream support portion, the working configuration being a configuration in which:
the upstream support portion is a generally annular disc that has (1) a tissue-contacting side, and (2) an opposing side,
the upstream support portion defines an opening between the tissue-contacting side and the opposing side, and
the tissue-contacting side is disposed against an atrial surface of the native valve; and
using the prosthetic valve support, supporting the prosthetic valve at the native valve.
7. The method according to claim 6 , wherein facilitating transition of the upstream support portion into the working configuration comprises exposing the upstream support portion from the delivery tube such that the upstream support portion automatically unrolls.
8. The method according to claim 6 , wherein, in the delivery configuration, the upstream support portion has a proximal portion and a distal portion, the channel being defined between the proximal portion and the distal portion, and wherein the method further comprises pressing the distal portion against the annulus such that the distal portion deflects with respect to the delivery tube.
9. The method according to claim 6 , wherein, in the delivery configuration, the upstream support portion has a proximal portion and a distal portion, the channel being defined between the proximal portion and the distal portion, and wherein the method further comprises pressing the distal portion against the annulus such that the distal portion deflects with respect to the proximal portion.