Closed-loop AI neural implant for chronic pain neuromodulation

• A wireless implant designed by USC and UCLA engineers delivers real-time, personalized pain relief using AI and a direct neural interface.¹
• The device uses closed-loop neuromodulation: it reads brain signals and adapts stimulation on the fly.¹
• The implant is powered by ultrasound (no batteries), has no wires, and is drug-free (no opioids).¹
• The device is designed to bend naturally with the spine.^{1 1}

Gardner updates

• USC and UCLA engineers designed a wireless implant that reads brain signals and uses AI for real-time, personalized pain relief with no batteries, wires, or opioids. ¹

• The implant is ultrasound-powered, adapts on the fly, and bends naturally with the spine; direct neural interface and closed-loop neuromodulation. ¹

• Scientists identified a brain circuit that can switch off chronic pain, supporting neuromodulation and neuroprosthetic targets (ScienceDaily; primary paper methods to be confirmed). ²

Weekly enrichment (2026-07-20)

• The device is a flexible ultrasound-induced wireless implantable (UIWI) spinal-cord stimulator, published in Nature Electronics (2025) by the Zhou Lab at USC Viterbi with the Jun Chen Group at UCLA (lead authors Yushun Zeng and Chen Gong).³⁴
• It is battery-free: powered by an external wearable ultrasound transmitter and converting mechanical ultrasound into electrical stimulation via a lead-zirconate-titanate (PZT) piezoelectric element (piezoelectric effect).³⁴
• Closed-loop control uses a ResNet-18 neural network to classify EEG-derived pain into three levels (slight, moderate, extreme) at 94.8% overall accuracy, then automatically adjusts the transmitted acoustic energy and resulting stimulation intensity.³⁴
• It was validated in rodent models, relieving chronic neuropathic pain evoked by both mechanical (pin-prick) and acute thermal (infrared heat) stimuli, with significant reductions in pain indicators.³⁴
• A conditioned place-preference experiment showed rodents preferred the chamber where the stimulator was active, corroborating the analgesic effect.³
• Clinical motivation: about 51.6 million Americans live with chronic pain (over 17 million high-impact), driving demand for a drug-free, opioid-sparing alternative to bulky, battery-powered, hard-wired spinal cord stimulators.³⁴
• The implant is designed to bend and twist with the spine; future directions include syringe-injectable miniaturization, an untethered or patch-style ultrasound transmitter, and smartphone-based control.³⁴
• Status caveat: results are preclinical (rodent), reported as Nature Electronics 8(5):437 (DOI 10.1038/s41928-025-01374-6); human trials are not yet reported.³

Footnotes

1. https://www.sciencedaily.com/releases/2025/06/250623233327.htm ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷

2. https://news.google.com/rss/articles/CBMib0FVX3lxTE5EU3NBNHhkYlk0VHlKWmRrN181aXdBMTMxS3NaN1V3UXhEM3N5WEhiMU0wdS11S0s1NlhXMUZ3b0ZkUVo4Ql9OMUExcnlPMFpIdkZBRkxZUHB0NEFjQVRIU1A3Y0hrb3pwYVJBY3Rpdw?oc=5 ↩

3. https://doi.org/10.1038/s41928-025-01374-6 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

4. https://viterbischool.usc.edu/news/2025/06/a-game-changing-wireless-implant-for-personalized-chronic-pain-relief/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶