The esophagus as one of the ducts of the human body, a tubular-shaped muscle tissue - mucous that connects the mouth and throat to the stomach. Today, in many countries, particularly in Iran, diseases caused by stenosis of the esophagus, causing irritation and spending much of the treatment. Produce a suitable scaffold could be an ideal solution for a healthy society. The use of stents, one of the best ways to remove tightness body vital tract such as the esophagus. The stent is a mesh tightly coiled tube, which temporarily or permanently as a mechanical scaffold to maintain or increase the body's internal duct diameter is used. According into consideration the physiological condition of the body duct, stent will always bear some force. The most important ones are: A) force caused by walls, so the must have a suitable the stent radial force. B) The force caused by passage of food, so the must have a suitable the stent Circumferential force. C) Since esophagus is not perpendicular at its length and have a curvature, so it must be a good stent buckling radius. stent materials include stainless steel, stainless steel with polymer coating and polymer materials. The use of metal stents in the treatment of lumens obstruction, especially esophageal had a greater impact. Metal stents should have good resistance to corrosion and high biocompatibility and to be not sensitive to X-rays. The important thing about the current stents is that are woven to way braid. In this study, we tried to make a weft knitted metal stent for the treatment of occlusion and tightness the esophageal. This stent is manufactured of stainless steel 316L. This stent is woven by flat knitting machine. Since the weft knitted have the flexibility, radial force and buckling force is better than the braid, this way tissue is used. Pressure test to determine the radial force is perpendicular to the central axis of the stent used. Uniaxial tensile test to measure the environmental force at transverse direction. Abaqus software is used for simulation. Finally, the results obtained from the experimental tests and Abaqus to optimize stent manufacturing process, have been compared and evaluated.
