hermetic seal integrity
Pronunciation: her-MET-ic seal in-TEG-ri-ty
The maintenance of a completely airtight and moisture-proof barrier in cardiac device enclosures to protect internal electronics from body fluids.
Full Definition
Hermetic seal integrity refers to the critical design requirement that cardiac device housings maintain a completely impermeable barrier against the infiltration of body fluids, gases, and other environmental contaminants. This sealing is typically achieved through precision welding techniques, specialized gaskets, or glass-to-metal seals that create an absolute barrier around the device's internal electronics and battery. Loss of hermetic seal integrity can lead to device malfunction, corrosion of internal components, battery depletion, or complete device failure. Testing protocols for hermetic seal integrity include helium leak detection, gross leak testing, and long-term accelerated aging studies. Regulatory standards such as ISO 11979 specify acceptable leak rates, typically measured in cubic centimeters per second of helium. Maintaining hermetic seal integrity throughout the device's expected lifespan is essential for patient safety and device reliability.
Usage
Usage note: Not to be confused with general 'waterproofing' or IP ratings. Refers specifically to absolute impermeability required for implantable devices.
In Context
- "Hermetic seal integrity testing revealed no detectable leaks after 10 years of simulated implantation conditions." — Quality assurance report
- "The device recall was attributed to compromised hermetic seal integrity in units manufactured during Q2 2023." — FDA safety communication