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Endoprostheses are mechanical components which have been optimized regarding biomechanical criteria and material aspects. An important claim is the realization of a stable implant-bone-interface. For example, the interface can be strongly influenced by load- or inflammation-induced bone reconstruction processes. This may lead to an exchange operation if the implant gets loose. The later an implant loosening is detected the higher the risk of complications is. The loosening of an implant can be determined by imaging procedures (e.g. X-ray) or functional diagnostics. However, these regular procedures are usually not possible and an implant loosening is detected too late.The proposed approach describes an actuator based on a ceramic multilayer which is materially integrated during the additive manufactring process of a hip implant. The system is hermetically encapsulated in the implant and can be controlled wireless via an extracorporeal unit.The implant and thus also the system consisting of implant and bone can be excited to vibrate in a defined manner. Changings in the implant-bone-interface leads to changes in the dynamic properties of the implant-bone-composite (e.g. resulting natural frequencies). Experimental investigations demonstrate the possibility of wireless energy transfer into the hermetically encapsulated implant. By using a 3D laser scanning vibrometer, the theoretically calculated mode shapes could be confirmed.In addition to the mechanical stimulation, the thermal activation of integrated shape memory alloy (SMA) actuators is also possible with the developed actuator principle. These SMA components can be used to generate an additional pressure force at the implant-bone-interface and are intended to refix the implant at a beginning loosening or to prevent the degradation of the bone substance.With ist modular design, the developed actuator system can also be integrated into other implant systems and represents a possibility for the monitoring of the implant-bone-interface as well as the conditon monitoring of complex components

Session 18. Organ and patient support systems I