Institute for
Robotics and Process Control

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Biomechanical Modeling of the Nasal Cavity and Paranasal Sinuses for Endonasal Surgery Simulation

Functional endoscopic sinus surgery has become the standard technique for the treatment of chronic sinusitis. For this surgical procedure, the inner nose structures are of anatomosurgical importance due to their proximity to vital structures such as optic nerve, internal carotid arteries and brain. In this project we develop accurate FEM models for simulation of the mechanical behaviour of the nasal cavity and paranasal sinuses under endoscope loading during endonasal surgery. The immediate motivation of this project is to provide a safe control strategy for a robotic endoscope guidance system. Such robotic system is being developed in collaboration with the Clinic and Policlinic for ENT Medicine and Surgery (University of Bonn). In order to gain the necessary conditions to build the biomechanical model, a serie of tasks have been performed, for example, biomechanical characterization of the nasal tissues, 3D reconstruction of nasal structures from CT images, and experimental estimation of the endoscope load profile in vivo. Here we present first results concerning a homogeneous FEM modeling of the nasal turbinates, a very important structure of the nasal cavity, and the Finite Element Analysis of the endoscope/tissue contacts in this structure during endonasal surgery

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