A circular band intended to be implanted in the heart to support an aortic valve annulus for the reconstruction and/or remodelling of an insufficient aortic valve. It is typically mounted on a disposable holder assembly to enable it to maintain its shape and aid in its implantation, which may involve a specialized handle, with sutures. The device may be semi-rigid or flexible and may include metallic, polymeric, and/or textile materials; it is available in various sizes.