Highly flexible and biocompatible interposer for medical applications

The focus of this work was the development of additive metal deposition techniques on Polydimethylsiloxane based foils. The metallic films provide electrical interconnection to commercial available surface-mount devices. Therefor two maskless techniques were investigated. First was Aerosol Jet^® deposition using an Optomec 3D printer and second was a laser structured thin film, which was deposited with physical vapor deposition (PVD). In addition the contacting between the SMD's and the interposer with an adhesive and a reactive multi-layer foil were investigated. Finally demonstrators which showed the principal functionality were built. For this purpose a simple circuit, composed of battery powered LED's and a PIC^® microcontroller, was developed. The circuit also includes a simple sensor logic which activates the LED's by touching a comb structure.