Triple Halo Coil Configuration for Depth-Selective Brain Stimulation

The patent divides a single large coil into multiple smaller coils arranged in a specific geometric pattern (e.g., hexagonal or circular arrays). This segmentation allows the magnetic fields from individual coils to constructively interfere at deep targets while destructively interfering at the surface, thereby achieving depth-selective stimulation without surface overstimulation

The patent transitions from conventional single-plane coil configurations to multi-dimensional spatial arrangements of multiple coils. By positioning coils in three-dimensional space with specific orientations and spacing, the system creates focused magnetic field patterns that penetrate deeply while maintaining surface field control through geometric phase cancellation

The patent designs coil arrays with universal geometric patterns (such as hexagonal or circular configurations) that can be applied to multiple deep brain targets by simply adjusting the activation sequence and timing parameters. This universal framework allows the same physical coil arrangement to stimulate different deep structures (thalamus, hippocampus, substantia nigra) without requiring custom coil designs for each target

The patent employs periodic pulsed stimulation patterns with specific duty cycles and inter-pulse intervals. By delivering magnetic pulses in periodic trains rather than continuous waves, the system achieves cumulative deep brain stimulation effects while allowing thermal dissipation and neural recovery, thereby enabling effective deep stimulation without excessive energy input that would increase device complexity