1. Huaiyin Institute of Technology; Jiangsu Provincial Key Laboratory for Interventional Medical Devices, School of Mechanical and Material Engineering, No.1 of Meicheng East Road; Huai'an 223003 P.R. China
2. Southwest Jiaotong University; Key Lab. of Advanced Technology for Materials of Chinese Education Ministry, School of Materials Science and Engineering, No. 111 of North Second Ring Road; 610031 Chengdu PR China