Analysis of Springback Displacement of dura mater Substitute for Precise Electrode Implantation

Electrode implantation through the dura mater usually leads to inaccurate localization of the superficial of the brain. The springback displacement of dura mater along with the puncture is a major reason. In this paper, we establish an energy model which can be described from three parts to represent the mechanical properties of the electrode-dura interaction based on two phases of the electrode implantation. The puncture of dura mater is analyzed from the perspective of energy conservation. With the whole model of different phases in electrode implantation, the springback displacement can be calculated by the puncture force, the puncture displacement and the implantation velocity. A series of experiments in eight different velocities are implemented on the artificial tissue to validate the model and identify the character parameters for getting a relation with the implantation velocity. Finally the validation experiments in other two velocities show that the proposed model can well represent the whole process. The mean error of the springback displacement is 0.0703mm which can be accepted in electrode implantation