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- W3133702883 endingPage "13675" @default.
- W3133702883 startingPage "13666" @default.
- W3133702883 abstract "Moisture penetration into active biomedical implants such as the bionic ear and eye is a major problem in healthcare since surgery is required to replace devices affected by corrosion. Existing methods for measuring moisture leak rates such as the commercially available dynamic relative humidity method are not sufficiently sensitive to guarantee security against moisture penetration. Helium leak detection is highly sensitive but is challenged by the unknown relation to the moisture leak rate because of mixed flow modes involving liquid water. A standard moisture leak traceable to fundamental units is not currently available, preventing direct comparison of moisture and helium leak rates in the same device. Here, we demonstrate a practical calibrated moisture leak based on the stable polymer poly(ether-ether-ketone), for calibrating heavy water mass spectrometry. Using biomedical test structures from manufactured encapsulations, we show that in the majority of cases, calibrated measurements of molar moisture leak rates exceed the helium leak rate, especially for very small and large leaks. Comparison with theory shows that LaPlace pressure is the driving force for the enhanced moisture flows. We recommend that the compliance limit for helium testing in biomedical devices be reduced by one order of magnitude." @default.
- W3133702883 created "2021-03-15" @default.
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- W3133702883 date "2021-03-10" @default.
- W3133702883 modified "2023-10-13" @default.
- W3133702883 title "Quantifying Moisture Penetration in Encapsulated Devices by Heavy Water Mass Spectrometry: A Standard Moisture Leak Using Poly(ether-ether-ketone)" @default.
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- W3133702883 doi "https://doi.org/10.1021/acsami.0c23115" @default.
- W3133702883 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33688725" @default.
- W3133702883 hasPublicationYear "2021" @default.
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