Magnetic Ophthalmic Realignment System for Extra-Ocular Muscle Loss Treatment

摘要

This paper presents the design and validation of a novel magnetic system for ophthalmic realignment in patients with damaged or lost extra-ocular muscles. The system utilizes two sets of Neodymium-Iron-Boron (NdFeB) magnets to replace the damaged muscle by generating a force curve close to the tissue tension that keeps the eye in the primary (straight ahead) position and restores the ability to rotate it. Finite-element model (FEM) simulations were used to estimate the generated magnetic field and calculate the tangential and total forces for various magnet schemes in order to choose the optimum structure. Magnet sizes and position limitations were obtained from typical anatomy of the human skull. To validate the simulation results, a magnetic (B)-field sensing board featuring a 3 × 4 matrix of 3-axis B-field sensors and a coverage area of 330 mm^{2 was implemented. Measured and simulated results are in good agreement and confirm the promise of the proposed therapeutic method.}