Some medical applications of thermomechanically treated titanium nickelide

Abstract
An original device and a method of its application for restoring of the function of relatively incompetent valves (both patented) are elaborated. Application of the new device allows to lower the difficulty of surgical treatment, to decrease the duration of operation and post-operative period. The long-term results of six-year long experience of its application are presented. The patients examination after 2,5-3,0 -year post-operation period shows perfect vein valve correction. A device for stone extraction from tubular organs (patented) fabricated with titanium nickelide superelastic alloy is presented. The new suggested design is free of the drawback inherent in the previous one. The working element of the device is formed as a truncated cone or a truncated cone coaxial with the cylinder (the previous design was formed as a full cone) that prevents overstraining and residual strain accumulation during the manipulation process. Since the first publication the design of spiral stent and its delivering system were exposed to significant changes. In spite of a number of successful operations carried out by means of reported devices the last one is not free from some negative features. The new patented variants of the device for stent implantation also differs from the previous one by the performing of the assembly for adjusting and fixing the position of the stent. The new device comprises superelastic nitinol workmg elements which provide efficiency and reliability.