An Improvement on the Performance of U Groove in the Polyaxial Pedicle Screw Head Using Taguchi Method

• Main Authors: Tsung-Chen Liu, 劉崇震
• Other Authors: Chung-Li Hwan
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/73509612957347497798

碩士 === 逢甲大學 === 機械與電腦輔助工程學系 === 101 === This study focuses on the discussion and analysis of combination of spinal polyaxial pedicle screw, set screws and rod that the U groove of polyaxial pedicle screw head would affect sufficient strength or other quality issues regarding different polyaxial groove U head parameters, such as head diameter, tooth type, tooth spacing, diameter and angle tooth type. Consequently, this study can determine the optimal parameters of U groove of polyaxial pedicle screw head. The experiement results are analyzed by L9 orthogonal array analysis of Taguchi method. Operators use torque wrench to insert set screw into U groove of polyaxial pedicle screw by 160Kgf-cm after the rod on U groove of polyaxial pedicle screw head. The weight of strength factors of U groove of polyaxial pedicele screw head are verified in this study. According to the statistical analysis results, the optimization conditions of factors are diameter 13mm of factor A, screw inner diameter 10.3mm and pitch 1.5mm of factor B, and thread angle 5 degree of factor C. The weight in order is screw anglem, following head diameter. The last is thread inner diameter and its pitch. The data and results are the significant future research reference for spinally polyaxial pedicle screw.