**2. Method to select stent suitable for clinical manifestation based on evaluation of stent rigidities**

It is important to evaluate mechanical properties of a stent for selecting one suitable for patient's condition. There have been many studies that have evaluated mechanical properties of a stent. (Duda et al., 2000) reported that the important properties of a stent include acceptable weight, stiffness in its radial direction, ease of insertion into the blood vessel, and radiation transmittance capability. They then proposed a method to evaluate stent and its performances. (Mori & Saito, 2005) performed a four-point bending test using a stainless steel stent to assess flexural rigidity for each different stent structure. (Carnelli et al., 2010) performed two mechanical tests on six kinds of carotid stents. They carried out a four-point bending test to assess flexibility of the stent. Their method of bending test was similar to that by (Mori & Saito, 2005). They also conducted a three-point compression test to measure the radial stiffness of the stent. Based on measurement results, they considered the relation between geometrical features of the stent and its mechanical properties. The results of these results provide a medical doctor the important information. If there exists a selection method of stent by using these evaluation results efficiently, the doctor can select a suitable stent easily in a large proportion of cases. However, there has been no study that has tried to propose the method to select a suitable stent by efficiently using evaluated mechanical properties. In this section, we introduce a method to select a stent suitable for patient's symptom based on mechanical properties of the stent.
