Many implantable medical devices contain electronic circuit and batteries. Biocompatible materials and a hermetical housing are required for a safe and sustainable implantation in the human body without toxic products release. The communication between electronic system located in a hermetic packaging and sensors is ensured by the conductive pads which are surrounded by a biocompatible insulation material.
Brazing is so far the most widely bonding process for ceramic to metal sealing when mechanically reliable hermetic joint are required. However for implantable applications, high content of expensive noble metals are added into the brazing paste.
Powder injection molding can open a new approach to elaborate hermetic feedthrough between Pt electrodes, alumina insulator and titanium ring. The process allows to carry out a complex multimaterials and gas tight component in a reduced steps of manufacturing without brazing.
The impact of process parameters is discussed in regard to expected specifications.