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Here, we introduce a fully implantable, battery\u2010powered system for light delivery to precise segments of the spinal cord in freely behaving small rodents, with operation and wireless recharging possible in any animal housing environments. Built from commercially available components with minimal in\u2010house fabrication, the system integrates low\u2010power electronic design, ultra\u2010thin and flexible probes with multiple embedded microscale light\u2010emitting diodes (\u00b5LEDs), coupled to a rechargeable battery in a modular configuration. The adaptable device can be used for optical stimulation with different wavelengths across various spinal levels with minimal system adjustments. Month\u2010long stability as well as the device functionality were validated in small rodents. Furthermore, operator\u2010free, targeted and transient paralysis of the hind limb was demonstrated through controlled optical stimulation of inhibitory interneurons.<\/jats:p>","DOI":"10.1002\/advs.75419","type":"journal-article","created":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T10:47:42Z","timestamp":1776854862000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Wireless, Adaptable and Fully Implantable Battery\u2010powered Devices for Optical Stimulation of the Spinal Cord in Small Rodents"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1933-7597","authenticated-orcid":false,"given":"Shahriar","family":"Shalileh","sequence":"first","affiliation":[{"name":"School of Biomedical Engineering University of British Columbia (UBC) Vancouver British Columbia Canada"},{"name":"International Collaborations on Repair Discoveries (ICORD)  Vancouver British Columbia 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