?:definition
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Implants designed for plastic repair of a cardiac valve by restoring its anatomic shape and size, usually by shortening the circumference of its annulus. These implants typically consist of a rigid, semirigid, or flexible metal (e.g., titanium alloy) or synthetic (e.g., silicone elastomer, polyethylene) ring that is inserted around the natural annular structure of a cardiac valve; sometimes an incomplete ring, known as a \'C-ring,\' or band, is used. Dedicated annuloplasty ring and band implants are used to restore mitral (e.g., to prevent regurgitation) and/or tricuspid (e.g., to treat insufficiency) valves.
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