WSU Researchers 3D Print Electronic Skin That Lets Prosthetics Sense Temperature and Pressure

Washington State University researchers have built an electronic skin system that can give prosthetic limbs a sense of touch. The device, described in Cell Reports Physical Science, detects pressure and temperature at a resolution ten times finer than current commercial glove sensors. The key to the system is a scan-model-print workflow that lets 3D printing produce customized sensor layouts matched to the shape of each individual prosthetic.

How It Works

The WSU team created thin sensor modules that sandwich temperature and pressure sensing elements together. Rather than using adhesives, the modules snap together like Lego bricks, making it easy to cover complex limb shapes without gaps. A scanner maps the prosthetic's geometry, software places the sensors along that shape, and a 3D printer produces the final assembly.

That last step is what makes the approach different from existing electronic skins. Most e-skins lose sensing ability when they are customized to a person's body. The WSU design keeps high resolution even on curved surfaces. The result is a system that can tell the difference between textures and material properties, not just raw force.

Why 3D Printing Matters Here

Traditional manufacturing for medical sensors involves clean rooms, photolithography, and long lead times. The WSU group used 3D printing and laser cutting instead. The method is simpler, lower cost, and faster to adapt for new patients. A clinician can scan a limb, adjust the sensor map, and print a new cover in hours instead of weeks.

The researchers have filed a provisional patent and are now working on an actuator that converts the skin's signals into nerve stimulation. If that actuator works, the electronic skin could do more than sense touch. It could let an amputee actually feel what their prosthetic is holding. That is a long road from lab to clinic, but the WSU team has already cleared the hardest manufacturing step.