Parylene-based encapsulation technology for wearable or implantable electronic devices
COAT-X, a Swiss company, is a leading solution provider for critical impermeability issues and expert in thin-film encapsulation. COAT-X’s innovative encapsulation technology provides a high-quality solution in form of a thin (< 10 µm), biocompatible and multilayered coating to protect critical electronic components, MEMS structures, sensors and PCBAs. The company provides an ultrathin layer coating to protect all sorts of electronics like wearables for medical application against corrosion and humidity caused by harsh environmental conditions.
The goal of the technology is to avoid the conventional thick resin encapsulation by a thin film coating composed of Parylene and ceramics thin films of a few micrometers to further miniaturize the devices. COAT-X encapsulation product has been validated by clinical studies on an implantable medical device in collaboration with a large medical device manufacturer.
This novel combined chemical vapor deposition (CVD/PECVD) process constitutes the core expertise of the company and its unique thin-film encapsulation competence. It allows a deposition at room-temperature and can be applied seamlessly to complex 3D components. Based on silicon oxide and Parylene-C, the multilayer provides a tightness which is 2000 times better compared to a traditional Parylene-C coating within a range from 1 to 10 μm layer thickness.
The water vapor transmission measurements showed extremely low rate of 4 × 10 -3 g / m 2 / day (38 ° C, 90% RH) for a 5 μm thick multilayer system, which would correspond to an epoxy resin film of 1 cm in thickness.
To verify the long-term performance of this coating technology in the human body, COAT-X deployed an accelerated aging platform to simulate the effects of real-time aging by subjecting specialized RF tags to elevated temperatures. The tags have been immersed in 87°C Phosphate Buffered Solution (PBS) for 4 months (acceleration factor of 32 according to the Arrhenius law) to simulate more than 10 years implantation in the human body. Contactless interrogation of the RF tag was performed on a regular basis to verify proper function of the simulated implantable device.
DR. Andreas Hogg
Andreas Hogg earned an engineering diploma in Microtechnology in 2006, and his MSc and PhD degrees in Biomedical Engineering at the University of Bern in 2014. He worked as development engineer at Johnson & Johnson from 2009 to 2014. Since 2014, he taught and led a R&D group at He-Arc, which was focused on thin-film technologies. Mr. Hogg is leading the operations of Coat-X.