Within the EU-funded research project NerveRepack, Chemnitzer Werkstoffmechanik GmbH (CWM) extends its expertise in materials science analysis and reliability assessment to the field of implantable systems.
The overall objective of the project is the development of a new generation of bidirectional implantable electrodes as well as external mechatronic assistive devices such as exoskeletons and exoprostheses. These neural interfaces enable communication between the patient’s nervous system and technical support systems, with the aim of restoring motor and sensory functions in patients with amputated or paralyzed limbs.
CWM contributes by investigating and evaluating the long-term mechanical reliability of implantable components under realistic operating conditions. The focus is on innovative Parylene coatings used for the encapsulation of implantable electronic components.
A key aspect of the work is the development of a soak test setup for the automated long-term analysis of the stability of biocompatible coatings in collaboration with Fraunhofer IZM. Coating prototypes are exposed to a body-like liquid environment and subjected to elevated temperatures and electrical stress. Optical measurements are performed using an adapted microDAC system through the liquid medium, while electrochemical impedance spectroscopy (EIS) is conducted in parallel. By combining optically measured deformation data analyzed with VEDDAC and impedance data, detailed insights into degradation and failure mechanisms can be obtained.
In addition, X-ray CT investigations are carried out and evaluated using digital volume correlation VEDDAC Volume. This enables the characterization of 3D deformation and damage processes and supports a comprehensive understanding of the underlying failure mechanisms.
