A nonsurgical brain implant enabled through a cell-electronics hybrid for focal neuromodulation.

Bioelectronic implants for brain stimulation are used to treat brain disorders but require invasive surgery. To provide a noninvasive alternative, we report nonsurgical implants consisting of immune cell-electronics hybrids, an approach we call Circulatronics. The devices can be delivered intravenously and traffic autonomously to regions of inflammation in the brain, where they implant and enable neuromodulation, circumventing the need for surgery. To achieve suitable electronics, we designed and built subcellular-sized, wireless, photovoltaic electronic devices that harvest optical energy with high power conversion efficiency. In mice, we demonstrate nonsurgical implantation in an inflamed brain region, as an example of therapeutic target for several neural diseases, by employing monocytes as cells, covalently attaching them to the subcellular-sized, wireless, photovoltaic electronic devices and administering the resulting hybrids intravenously. We also demonstrate neural stimulation with 30-µm precision around the inflamed region. Thus, by fusing electronic functionality with the biological transport and targeting capabilities of living cells, this technology can form the foundation for autonomously implanting bioelectronics.