Core Insights - An international research team has developed a new type of brain implant called the microfluidic axial electrode, which can precisely deliver drugs to different regions of the brain, potentially advancing research on epilepsy and complex brain functions like memory and decision-making [1][2] Group 1: Device Design and Functionality - The microfluidic axial electrode is designed to distribute functions along its axis, allowing for simultaneous optical stimulation, electrical signal recording, and drug delivery at multiple depths, unlike traditional devices that operate at a single endpoint [1] - Made from soft polymer optical fibers, the new electrode closely resembles brain tissue, reducing mechanical damage and chronic rejection, which are common issues with traditional silicon-based implants [1][2] - The electrode's tip features a special angled design that minimizes damage to brain tissue during insertion, achieving higher precision and lower trauma [1] Group 2: Manufacturing and Testing - The manufacturing process of the microfluidic axial electrode involves a technique similar to "pulling sugar," where a large polymer rod is heated and stretched into ultra-fine fibers with a diameter of less than half a millimeter [2] - The internal structure of the electrode includes a central light-conducting core surrounded by eight microfluidic channels, enabling precise injection of different drugs or chemicals into brain regions within 3 millimeters of each other [2] - Successful experiments on mice demonstrated that the implanted electrodes allowed for free movement without noticeable discomfort, enabling simultaneous monitoring of electrical activity in both the cortex and hippocampus [2] Group 3: Future Implications - With further optimization, the microfluidic axial electrode is expected to become a crucial tool for studying brain disease mechanisms and developing closed-loop neuroregulation therapies [3]

Core Insights - An international research team has developed a new type of brain implant called the microfluidic axial electrode, which can deliver drugs to different areas of the brain. This breakthrough is expected to advance research on complex brain functions such as epilepsy, memory, and decision-making, and open new pathways for precise treatment of neurological diseases [1][2]. Group 1: Device Design and Functionality - The microfluidic axial electrode is designed to distribute functions along its axis, allowing for simultaneous optical stimulation, electrical signal recording, and drug delivery at multiple depths along the implantation path, unlike traditional end-point devices [1]. - The electrode is made from soft polymer optical fibers, which closely match brain tissue, reducing mechanical damage and chronic rejection, and features a specially angled tip for minimal tissue disruption during insertion [1][2]. Group 2: Manufacturing Process and Experimental Validation - The manufacturing process of the microfluidic axial electrode involves heating and stretching a large polymer rod into ultra-fine fibers with a diameter of less than half a millimeter, integrating a light-conducting core and eight microfluidic channels [2]. - Successful experiments on mice demonstrated that the implanted microfluidic axial electrode allowed for independent monitoring of electrical activity in both the cortex and hippocampus, as well as the precise injection of different drugs or chemicals across brain regions within a distance of 3 millimeters [2].