Design and functional verification of a flexible wireless spinal cord stimulator with spinal motion monitoring function

Spinal Cord Injury (SCI) poses a significant threat to the physical and mental well-being of patients worldwide, with conventional therapeutic approaches demonstrating limited efficacy in restoring neural function. To address this challenge, we propose a flexible, wireless spinal cord stimulation system equipped with spinal motion monitoring capabilities. This system integrates a wireless flexible spinal cord stimulator and a self-powered spinal motion monitor based on a triboelectric nanogenerator (TENG). The stimulator features fractal serpentine stretchable electrodes, which are mechanically compatible with spinal tissue, allowing it to accommodate spinal deformation and thereby minimizing the risk of tissue damage. The system also incorporates a wireless receiving antenna (Rx), composed of flexible capacitors and electrodes, designed to receive periodic electrical stimulation. The wireless stimulation is powered via electromagnetic coupling, eliminating the need for a battery and making the system more lightweight and multifunctional. Additionally, the spinal motion monitor enables real-time monitoring of the patient's spinal health, transmitting data via Bluetooth to assist clinicians and patients in preventing secondary injuries and optimizing rehabilitation strategies. This work presents a novel integrated medical device system that combines wireless transmission, therapeutic intervention, and health monitoring, offering a promising new avenue for advanced healthcare solutions.