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The limits of hermeticity test methods for micropackages
Anne Vanhoestenberghe1, Nick Donaldson
1Implanted Devices Group, University College London, London, UK. annevh@medphys.ucl.ac.uk
Artificial Organs
|March 16, 2011
Summary
Hermeticity ensures implantable electronics last. Current leak detection methods fail for tiny, long-life medical devices, necessitating advanced solutions.
Area of Science:
- Materials Science
- Biomedical Engineering
- Electrical Engineering
Background:
- Hermeticity is vital for implantable electronic package longevity.
- Micromachining advances lead to smaller package volumes.
- Existing leak detection methods lack sensitivity for miniaturized devices.
Purpose of the Study:
- Review the limitations of current hermeticity testing methods.
- Assess the inadequacy of these methods for medical applications requiring 50+ year device lifespans.
- Highlight the need for more sensitive leak detection technologies.
Main Methods:
- Literature review of common leak detection techniques.
- Analysis of sensitivity limits for each method.
- Case study evaluation for medical implantable electronics.
Main Results:
- Established methods like bubble testing and pressure decay are insufficient for micro-scale packages.
- Sensitivity requirements for 50-year implantable devices exceed current detection capabilities.
- Inadequacy demonstrated for helium leak detection in certain micro-applications.
Conclusions:
- Current leak detection technologies are inadequate for next-generation implantable medical electronics.
- Advanced, highly sensitive methods are required to ensure the long-term reliability of medical implants.
- Future research should focus on developing novel detection techniques for micro-scale hermeticity assurance.
