FEM analysis of drills used in bone surgery

摘要

Purpose: The aim of the work was determination of biomechanical analysis of a surgical drill -bone system in simulated conditions of drilling in a bone. Design/methodology/approach: Geometrical model of the selected surgical drill and simulated femur (cortical bone) was worked out in the Inventor Professional 2008. The value geometry of the edge was point angle (2k_1 = 90° and 2k_2 = 120°). Numerical model was prepared in ANSYS Workbench v. 11. Meshing was realized with the use of SOLID 187 elements. Evaluate boundary conditions to numerical analysis imitate phenomena in real system with appropriate accuracy. Drill was loaded with forces in the range F= 100-200 N and torque T = 0.04 Nm. Calculations were carried out for two kinds of metallic material of the drill. Findings: The effect of numerical analysis was determination of strains and stresses in working part of the drill. Results of analysis indicate diverse values of strains and stresses distribution in working part of the drill depending on its geometry. The maximum values of strains and stresses were obtained for the drill of point angle 2k_1=120°. Research limitations/implications: In order to simulate phenomena in real system, a simplified model of surgical drill - femur system was worked out. The simplifications concerned mostly geometry of a femur. The femur was represented by disc of height h = 10 mm, corresponding with thickness of cortical bone.