IPC International Community magazine an association member publication
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98 I-CONNECT007 MAGAZINE I JUNE 2026 Flex and rigid-flex PCBs are shaping the future through a range of innovative applications, including neural interface arrays that redefine brain-machine communication in the medical field. For decades, scientists and engineers have dreamed of tapping into this electrochemical symphony, and flex PCBs are finally making that dream clinically viable. What Are Neural Interface Arrays? The brain has always been the final frontier. Neu- ral interface arrays are the first real map: micro- electrode grids thin enough to drape over living tissue, precise enough to read individual neurons, and powerful enough to let a paralyzed hand move again. The human brain contains roughly 86 bil- lion neurons, each firing electrical signals that col- lectively orchestrate everything from conscious thought to involuntary breathing. Traditional rigid PCBs were never suited for neural applications. The brain is soft, gelatinous, and constantly shifting with heartbeat and respira- tion. Press a rigid board against cortical tissue and you get mechanical mismatch: micromotion that causes scarring, inflammation, and signal degra- dation within weeks. The implant effectively blinds itself through its own presence. Flex PCBs change the equation entirely. Fabri- cated on polyimide or liquid crystal polymer BY A N AYA VA R DYA , A M E R I CA N STA N DA R D C I RC U I TS A RT I C L E Rewiring Medical Brain-Machine Communication With Flex PCBs