Intelligenter Fixateur Externe für Frakturbehandlung und Korrekturen

Intelligent implants are characterized by measurement sensors and a corresponding evaluation unit. External systems offer the additional possibility to implement actuators, which are controlled by the sensors via a knowledge-based control software. An external fixator has been developed that can perform adjustments of the fixator autonomously by a permanently mounted microcontroller system. Additionally, it will inform the surgeon and the patient about the fracture healing progress, e.g. indicate possible weight bearing of the extremity. The intelligent system is based on a 6 degrees of freedom controllable hexapod robot kinematic. By implementation of motors, gears and position sensors a motorized external fixator and by insertion of force sensors, a 6 degrees of freedom measuring fixator system was accomplished. Currently, a motor control and measuring electronic is realized on a 2×3 cm circuit board. A software was developed, performing motor controlled bone movements which are input by a 3-dimensional input device (3D mouse"). Bone movements can be simulated or observed online on the computer screen. Intelligent external fixator systems will not only optimize bone healing and increase patient safety but also enable cost reductions.