A. Weizman, L. Monassevitch, K. Greenberg, S. Millis, B. Harari, NiTi surgical solutions, Netanya, Israel; I. Dar, C.A.S - Computerized Analysis & Simulation, Tirat Hacarmel, Israel
Reconstruction of the digestive system lumen patency (anastomosis creation) after its partial surgical removal is a common and crucial procedure. The conventional anastomosis methods use devices for mechanical suturing which associate with high failure risk and can lead to major complications. The compression anastomosis as a sutureless method seems to be promising alternative. But two centuries attempts were not quite successful since complex character of tissue healing process. The specific mechanical behavior of nitinol alloys was applied to the force element of the compression devices, these devices start to be widely adopted in surgery practice. The compression anastomosis device enables the anastomosis of colonic tissue based on compression forces exerted by nitinol leaf springs. By changing the strain distribution in the stressed leaves with varying moment of inertia one can gain full control of the different stages in the force-deflection profile (i.e. linear elastic stage and the force plateau stage). The target of this study is the geometry optimization of the nitinol leaf spring based on finite element analysis. The results of the finite element studies allow us to establish regulation of the spring’s mechanical behavior, thus controlling the anastomosis creation in the compression anastomosis device.
Summary: The results of the finite element studies of a nitinol leaf spring allow us to establish regulation of the spring’s mechanical behavior, thus controlling the anastomosis creation in the compression anastomosis device.
