Fig. 3: Power harvesting, thermal, and mechanical testing of the device.
From: Wireless, battery-free, and fully implantable electrical neurostimulation in freely moving rodents
a Photograph of the device mounted on a dimensionally accurate 3D printed adult rat skull. b Photograph of the experimental arena used for in vivo stimulation studies. c Harvesting power vs. load curve in the center of the arena (22 cm × 28 cm) with RF input power of 3 W. d Current consumption during operation of the device during a single stimulation pulse. e Spatially resolved energy harvesting capability at two heights of the miniaturized device in a cage with dimensions of 22 cm × 28 cm and 3 W RF input. f Harvested power vs. angular misalignment between the device and cage antenna in the center of the arena (22 cm×28 cm) with RF input power of 3 W. g Power harvested between RF powers of 2 W and 10 W. h Power harvested in the center of two turn circular cages with increasing cage radius. i RF power needed for stable operation with a 20% safety factor in two turn circular cages with increasing cage radius. j Steady-state thermal impact simulation of device under continuous operation in saline. k Mechanical characteristics of serpentine interconnect. l Accelerated rate testing of device encapsulation in PBS
