An inchworm piezoelectric actuated cochlear implant electrode mechanism: design, modelling, and experimental evaluation

Minimally Invasive Cochlear Implantation (MICI) has garnered praise from clinicians due to its aesthetic incision and minimal trauma to internal tissues. However, the limited field of vision and movement for surgeons during MICI surgery necessitates the development of a stable and efficient cochlear electrode implantation device. In this study, we propose a novel inchworm mechanism leveraging reversible deformation of a flexural hinge, comprising two piezoelectric micro-grippers and a piezoelectric propeller, designed to automatically implant the cochlear electrode. Experimental tests evaluating static and dynamic performance were conducted to assess the electrode-inserting function. Our results demonstrate reliable clamping of the electrodes and successful implantation into the cochlear model. This advancement holds promise for enhancing the efficacy and precision of MICI procedures, potentially improving outcomes for cochlear implant recipients.