For user comfort and reliability reasons, electronic circuits for human body related applications should ideally be soft, elastic and stretchable, for smart textile application, but also for applications which need a high level of biocompatibility. We are developing several roll-to roll technologies using MID (Molded Interconnect Device) and low cost standard PCB technology (Printed Circuit Board) to produce soft, stretchable, human-compatible packaging. All those technologies are based on a sacrificial layer on where meander shaped interconnections are patterned. Those stretchable interconnections are connecting together non-stretchable functional islands on where SMD components are soldered. All the system is then embedded in stretchable polymer matrix, silicone rubber or polyurethane. All these technologies are using standards methodologies for PCB productions (lamination, photolithography, copper etching, reflow oven lead free soldering).
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