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Development of a Functional External Fixator System for Bone Deformity near Joints in Legs  

Lee Ho-Jung (한국기술교육대학교 메카트로닉스공학부 대학원)
Chun Keyoung-Jin (한국생산기술연구원 시스템엔지니어링팀)
Publication Information
Journal of the Korean Society for Precision Engineering / v.22, no.3, 2005 , pp. 162-169 More about this Journal
Abstract
The functional external fixator system fur bone deformity near joints in legs using the worm gear was developed for curing the difference angles in fracture bone and the lengthening bar for curing the difference length in fracture bone. Both experiments and FE analysis were performed to compare the elastic stiffness in several loading modes and to improve the functional external fixator system for the bone deformity. The FE model using the compressive and bending FE analysis was applied to the FE analysis due to the angle differences. The results show that the compressive stiffness value in experiment was 175.43N/mm; the bending stiffness value in experiment was 259.74N/mm; compressive stiffness value in FEM was 188.67N/mm; bending stiffness value in FEA was 285.71N/mm. The errors between experiments and FEA were less than 10%. The maximum stress (157MPa) to the angle of clamp was lower than the yield stress (176.4MPa) of SUS316L. The stiffnesses in both axial compressive and bending of the new fixator are about 2 times higher than other products except EBI (2003).
Keywords
Functional; Maximum stress; Compressive stiffness; Bending stiffness; Finite element analysis; Angle; Worm gear;
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