HANNOVER MESSE 2019, 01 - 05 April
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Tight, tighter, hermetically tight

Low-temperature bonding technique safely seals intelligent implant

Logo Karlsruher Institut für Technologie


Karlsruher Institut für Technologie

Exhibitor details
Exhibitor details
Logo Tight, tighter, hermetically tight

Product description

Nowadays, micro-format medical engineering enables implants to assume important body functions when health problems occur. Examples here include nerve stimulators such as heart pacemakers or replacement organs like cochlea implants. These intelligent implants are highly complex systems comprising sensors, actors and signal processing. For them to be employed safely in the human body, it is necessary to have the implants hermetically sealed. This prevents material being released that could be harmful to the body while also protecting the microsystem against penetration by corrosive body fluids. As a rule, implants are packed in casings welded closed and containing integrated electronics. However, welding can damage microsystems that are sensitive to temperature. Furthermore, when metal casings are involved, signal transmission can be impaired. As an alternative, flexible implant components in particular are coated with the hydrophobic polymer parylene, and moulded in silicon. Reduced tightness in comparison to casings requires inert materials such as gold being used for the implants. Scientists at KIT have developed a new, hermetically sealing bonding technique in the low-temperature area. Here, casing components such as glass or titanium are bonded through gluing. The glue joint is subsequently sealed with a layer of sealing material such as titanium, preferably through cathode sputtering. The thicker this layer is, the more watertight it will be. Sealing can be further optimised with a multilayer structure. The thermic stress occurring during bonding is only very low. If non-metal casing material is used, electromagnetic shielding will be negligible. The new material enables different materials and surfaces to be bonded and can even balance production tolerances. A further advantage is that electric power grommets can be planted in the glue joint, with the glue acting as an insulator.

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Hall 2, Stand B16

(Main stand)

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