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Design and Optimization of the Separated Interface Nerve Electrode for a Freeform Stimulator in Vestibular Restoration

Project Description:

The Separated Interface Nerve Electrode (SINE) is a critical component of the Freeform Stimulator (FS) system, a novel neuromodulation technology designed to delivery ionic direct current (iDC) for vestibular. Neuromodulation technologies are integral to rehabilitative applications that require precise control over neural activity; however, current SINE designs face challenges such as mechanical kinking and gel dehydration, which affect long-term performance. This project aimed to optimize the design of the SINE to improve flexibility, stability, and consistent iDC delivery. To address these challenges, we developed a SINE incorporating a double network hydrogel composed of ionically and covalently crosslinked networks. This formulation enhances both ionic conductivity and mechanical resilience. To prevent dehydration and ensure mechanical integration, the hydrogel is chemically bound to a flexible elastomer substrate with coupling agents. This hybrid design advances the reliability and performance of the Freeform Stimulator system in vestibular rehabilitation.

Project Photo:

Picture depicting mechanical and conductivity on various hydrogels and electrode components.

MSE Design Team in Collaboration with the Machine Biointerface Lab

Project Poster

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Project Poster Summary:

The Separated Interface Nerve Electrode (SINE) is a critical component of the Freeform Stimulator (FS) system, a novel neuromodulation technology designed to delivery ionic direct current (iDC) for vestibular. Neuromodulation technologies are integral to rehabilitative applications that require precise control over neural activity; however, current SINE designs face challenges such as mechanical kinking and gel dehydration, which affect long-term performance. This project aimed to optimize the design of the SINE to improve flexibility, stability, and consistent iDC delivery. To address these challenges, we developed a SINE incorporating a double network hydrogel composed of ionically and covalently crosslinked networks. This formulation enhances both ionic conductivity and mechanical resilience. To prevent dehydration and ensure mechanical integration, the hydrogel is chemically bound to a flexible elastomer substrate with coupling agents. This hybrid design advances the reliability and performance of the Freeform Stimulator system in vestibular rehabilitation.

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