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Medical implants are all ideal example of the growing application of microsystems and a convincing proof for their high future potential. The use of implants in human bodies has high demands on safety and biocompatibility on the system. The downsizing of well known systems such as pacemakers, comes to an extent where rigid housings are not possible any more. In addition the systems have become more and more flexible in order to enter new fields of applications. Therefore the assembly and packaging of implantable micro-systems plays a mayor role in the useability of new implants. As an example for the integration of a microsystem in a medical implant, a micro bloodpump with a micro pressure sensor was developed. For the first time MID (moulded interconnected device) technology was applied in a medical device. MID technology plays the key role in the multifunctional use of the components: it functions as sensor mount, electric conductor and pump housing. In addition to that the whole system should be biocompatible even if partial damage to the coating occurs.