Laser Welding of a Titanium Feed Through

H. Viatge
SORIN Group, France

In all implantable medical devices, one main challenge is to assure no water penetrates in the electronic part of the system. To be able to transmit the electronic information from the inside of the device to the lead without any water infiltration, we used a complex part called feed through. This piece is made of four different materials: titanium, alumina, gold and platinum. It is incorporated in the device by laser welding and as a result it undergoes an important level of thermo mechanic stresses during assembly. The goal of the simulation using COMSOL is to determine the influence of power, frequency, and pulsation length of the laser on the stresses induced in the piece. In a second time we want to optimize the path the laser is following during the process.