A method is provided, including providing a semilunar valve prosthesis, and implanting the prosthesis without using any imaging techniques. Another method is provided, including providing a semilunar valve prosthesis, placing the prosthesis in a body of a subject, and determining a correct rotational...http://www.google.ca/patents/US20080071362?utm_source=gb-gplus-sharePatent US20080071362 - Valve prosthesis implantation techniques
