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Accelerated-stress reliability evaluation for an encapsulated wireless cortical stimulator.

Sungjae Suh, Philip R Troyk, Zhe Hu

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 9, 2015
    PubMed
    Summary

    Prototype wireless cortical stimulators for the Intracortical Visual Prosthesis (ICVP) project demonstrated remarkable robustness. Accelerated testing showed no physical or electrical degradation after 2200 hours of high-humidity, high-temperature exposure.

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    Area of Science:

    • Biomedical Engineering
    • Materials Science

    Background:

    • The Intracortical Visual Prosthesis (ICVP) project aims to restore vision using neural stimulation.
    • Reliability of implanted electronic devices is critical for long-term function and patient safety.

    Purpose of the Study:

    • To evaluate the long-term stability and robustness of prototype wireless cortical stimulator modules.
    • To assess the impact of accelerated environmental stress testing on stimulator device integrity.

    Main Methods:

    • Prototype stimulator modules, featuring a custom ASIC and PDMS encapsulation, underwent accelerated environmental stress testing.
    • Devices were subjected to autoclave conditions (121°C, 100% RH) for over 2200 hours, with and without electrical power applied to the ASIC.
    • Electrical function was monitored using reverse telemetry to measure the internal power supply.

    Main Results:

    • No physical degradation of the stimulator devices was observed after the 2200-hour autoclave soak.
    • Reverse telemetry data confirmed continuous and stable electrical functioning of the devices throughout the entire test period.
    • The accelerated moisture resistance testing demonstrated the thermo-mechanical and electrical robustness of the stimulator modules.

    Conclusions:

    • The wireless cortical stimulator modules exhibit excellent long-term stability and reliability under harsh environmental conditions.
    • The demonstrated robustness supports the suitability of these devices for implantation in vision prosthesis applications.
    • Accelerated moisture resistance testing is an effective method for verifying the long-term performance of neuroprosthetic devices.