Artificial Skin Could Help Rehabilitation and Enhance Virtual Reality


Reading time ( words)

Just like our senses of hearing and vision, our sense of touch plays an important role in how we perceive and interact with the world around us. And technology capable of replicating our sense of touch—also known as haptic feedback—can greatly enhance human-computer and human-robot interfaces for applications such as medical rehabilitation and virtual reality.

Scientists at EPFL’s Reconfigurable Robotics Lab (RRL), headed by Jamie Paik, and Laboratory for Soft Bioelectronic Interfaces (LSBI), headed by Stéphanie Lacour at the School of Engineering, have teamed up to develop a soft, flexible artificial skin made of silicone and electrodes. Both labs are part of the NCCR Robotics program.

The skin’s system of soft sensors and actuators enable the artificial skin to conform to the exact shape of a wearer’s wrist, for example, and provide haptic feedback in the form of pressure and vibration. Strain sensors continuously measure the skin’s deformation so that the haptic feedback can be adjusted in real time to produce a sense of touch that’s as realistic as possible. The scientists’ work has just been published in Soft Robotics.

“This is the first time we have developed an entirely soft artificial skin where both sensors and actuators are integrated,” says Harshal Sonar, the study’s lead author. “This gives us closed-loop control, which means we can accurately and reliably modulate the vibratory stimulation felt by the user. This is ideal for wearable applications, such as for testing a patient’s proprioception in medical applications.”

Haptics Sandwiched Between Silicone Layers

The artificial skin contains soft pneumatic actuators that form a membrane layer which can be inflated by pumping air into it. The actuators can be tuned to varying pressures and frequencies (up to 100 Hz, or 100 impulses per second). The skin vibrates when the membrane layer is inflated and deflated rapidly. A sensor layer sits on top of the membrane layer and contains soft electrodes made of a liquid-solid gallium mixture. These electrodes measure the skin’s deformation continuously and send the data to a microcontroller, which uses this feedback to fine-tune the sensation transmitted to the wearer in response to the wearer’s movements and changes in external factors.

The artificial skin can be stretched up to four times its original length for up to a million cycles. That makes it particularly attractive for a number of real-world applications. For now the scientists have tested it on users’ fingers and are still making improvements to the technology.

“The next step will be to develop a fully wearable prototype for applications in rehabilitation and virtual and augmented reality,” says Sonar. “The prototype will also be tested in neuroscientific studies, where it can be used to stimulate the human body while researchers study dynamic brain activity in magnetic resonance experiments.”

Share

Print


Suggested Items

Uncertainties in the Market Rise while a Bounce in NAND Flash Prices Remains Unlikely in 3Q

06/20/2019 | TrendForce
According to the latest investigations by DRAMeXchange, a division of TrendForce, demand for smartphones and servers go below expected levels in 2019 as the US-China trade dispute heats up.

NASA Awards Artemis Contract for Lunar Gateway Power, Propulsion

05/27/2019 | NASA
In one of the first steps of the agency’s Artemis lunar exploration plans, NASA announced the selection of Maxar Technologies, formerly SSL, in Westminster, Colorado, to develop and demonstrate power, propulsion and communications capabilities for NASA’s lunar Gateway.

DARPA Program Aims to Extend Lifetime of Quantum Systems

01/19/2018 | DARPA
Whether it is excited electrons emitting photons in a lightbulb or the vibrational frequency of atoms in an atomic clock, quantum phenomena are simultaneously fundamental aspects of nature and the basis of current state-of-the-art and future technologies.



Copyright © 2019 I-Connect007. All rights reserved.