Twenty-four miniature ultrasound transducers widen drug coverage in the brain

MIT's LUCID prototype 3D-prints a drug-delivery channel directly onto an array of 24 miniature ultrasound transducers in a flexible implant as thin as cardstock. It connects to a roughly 100-microliter reservoir, osmotic pump, wirelessly rechargeable battery and Bluetooth control. The concept is to implant it during glioblastoma surgery for long-term local delivery; ultrasound creates convective flow and temporarily increases blood-brain barrier permeability so molecules spread farther than passive diffusion. The team observed wider distribution in tissue-mimicking gel and in mouse MRI contrast-agent tests, but has not shown anti-tumor efficacy in humans. Potential payloads include small molecules, immunotherapies, nucleic acids and gene therapies. Remaining hurdles include surgical safety, long-term biocompatibility, infection, battery and wireless reliability, dosing in the human brain and actual survival benefit.