Aortic valve protheses using Nitinol

"There is a need for fast sutureless implantation of valve prostheses with a better outcome than that of current valved stents. The suture ring of a St Jude mechanical valve prosthesis (…) was replaced by a proprietary non–stent-based attachment ring made of Nitinol memory metal (Endosmart®, Stutensee, Germany) and covered with textil. In acute pig experiments, the aortic valve was removed and the device was introduced in a temporary stretched shape and activated by removing constrainers and heating to reach its final attachment shape …"

pdf file The Journal of Thoracic and Cardiovascular Surgery; 12/2007; 134:1508-12