Validating hermeticity in welded metallic implantable medical devices
K.J. Ely, GlaxoSmithKline Corporation, USA
The term hermetic seal has various meanings to many in the medical industry. All enclosures will leak, just at different rates. The process and design goal is to manage this leak rate to ensure the package remains safe and effective for the patient or users throughout its design life. The word hermetic is taken from the name of the Ancient Greek alchemist Hermes Trismegistus who is claimed to have invented a magic seal to make vessels airtight. This chapter will highlight several aspects of hermetic seals, and will present the first principles of this process, to enable all practitioners to discover Hermes’ ‘magic’ ...