Bistable Designed Haptic Patch Transmits Touch Sensations to Skin
Author: Northwestern University
Published: 2024/11/06
Publication Type: Product Release, Update - Peer-Reviewed: Yes
Topic: Assistive Technology (Publications Database)
Page Content: Synopsis Introduction Main Item
Synopsis: Northwestern University engineers have developed a haptic device which can deliver various sensations, including vibrations, pressure and twisting.
Why it matters: This article describes a groundbreaking development in haptic technology that could revolutionize virtual and augmented reality experiences. Researchers at Northwestern University have created a thin, wireless patch capable of transmitting complex touch sensations to the skin, including pressure, vibration, and motion. This innovation is particularly significant as it addresses the limitations of current haptic devices, which often provide only simple vibrations. The patch's ability to simulate intricate touch sensations could greatly enhance immersion in virtual environments, improve prosthetic feedback for amputees, and enable more realistic training simulations for medical professionals. By advancing the field of haptic technology, this research opens up new possibilities for more natural and intuitive human-computer interactions across various applications - Disabled World.
Introduction
A Northwestern University-led team of engineers has developed a new type of wearable device that stimulates skin to deliver various complex sensations. The thin, flexible device gently adheres to the skin, providing more realistic and immersive sensory experiences. Although the new device obviously lends itself to gaming and virtual reality (VR), the researchers also envision applications in healthcare. For example, the device could help people with visual impairments "feel" their surroundings or give feedback to people with prosthetic limbs. The title of the study is "Bioelastic state recovery for haptic sensory substitution."
Main Item
The device is the latest advance in wearable technology from Northwestern bioelectronics pioneer John A. Rogers. The new study builds on work published in 2019 in Nature, in which his team introduced "epidermal VR," a skin-interfaced system that communicates touch through an array of miniature vibrating actuators across large areas of the skin, with fast wireless control.
"Our new miniaturized actuators for the skin are far more capable than the simple 'buzzers' that we used as demonstration vehicles in our original 2019 paper," Rogers said. "Specifically, these tiny devices can deliver controlled forces across a range of frequencies, providing constant force without continuous application of power. An additional version allows the same actuators to provide a gentle twisting motion at the surface of the skin to complement the ability to deliver vertical force, adding realism to the sensations."
Rogers is the Louis A. Simpson and Kimberly Querrey Professor of Materials Science and Engineering, Biomedical Engineering and Neurological Surgery, with appointments in Northwestern's McCormick School of Engineering and Northwestern University Feinberg School of Medicine. He also directs the Querrey Simpson Institute for Bioelectronics.
Rogers co-led the work with Northwestern's Yonggang Huang, the Jan and Marcia Achenbach Professorship in Mechanical Engineering at McCormick; Hanqing Jiang of Westlake University in China; and Zhaoqian Xie of Dalian University of Technology in China. Jiang's team built the small modifying structures needed to enable twisting motions.
Leveraging Skin-stored Energy
The new device comprises a hexagonal array of 19 small magnetic actuators encapsulated within a thin, flexible silicone-mesh material. Each actuator can deliver different sensations, including pressure, vibration and twisting. Using Bluetooth technology in a smartphone, the device receives data about a person's surroundings for translation into tactile feedback - substituting one sensation (like vision) for another (touch).
Although the device is powered by a small battery, it saves energy using a clever "bistable" design. This means it can stay in two stable positions without needing constant energy input. When the actuators press down, it stores energy in the skin and in the device's internal structure. When the actuators push back up, the device uses the small amount of energy to release the stored energy. So, the device only uses energy when the actuators change position. With this energy-efficient design, the device can operate for longer periods of time on a single battery charge.
"Instead of fighting against the skin, the idea was ultimately to actually use the energy that's stored in skin mechanically as elastic energy and recover that during the operation of the device," said Matthew Flavin, the paper's first author. "Just like stretching a rubber band, compressing the elastic skin stores energy. We can then reapply that energy while we're delivering sensory feedback, and that was ultimately the basis for how we create the created this really energy-efficient system."
At the time of the research, Flavin was a postdoctoral researcher in Rogers' lab. Now, he is an assistant professor of electrical and computer engineering at the Georgia Institute of Technology.
Sensory Substitution
To test the device, the researchers blindfolded healthy subjects to test their abilities to avoid objects in their path, change foot placement to avoid injury and alter their posture to improve balance.
One experiment involved a subject navigating a path through obstructing objects. As the subject approached an object, the device delivered feedback in the form of light intensity in its upper right corner. As the person moved nearer to the object, the feedback became more intense, moving closer to the center of the device.
With only a short period of training, subjects using the device were able to change behavior in real time. By substituting visual information with mechanical, the device "would operate very similarly to how a white cane would, but it's integrating more information than someone would be able to get with a more common aid," Flavin said.
"As one of several application examples, we show that this system can support a basic version of 'vision' in the form of haptic patterns delivered to the surface of the skin based on data collected using the 3D imaging function (LiDAR) available on smartphones," Rogers said. "This sort of 'sensory substitution' provides a primitive, but functionally meaningful, sense of one's surroundings without reliance on eyesight - a capability useful for individuals with vision impairments."
Attribution/Source(s):
This peer reviewed publication was selected for publishing by the editors of Disabled World due to its significant relevance to the disability community. Originally authored by Northwestern University, and published on 2024/11/06, the content may have been edited for style, clarity, or brevity. For further details or clarifications, Northwestern University can be contacted at northwestern.edu. NOTE: Disabled World does not provide any warranties or endorsements related to this article.
1 - Bistable Designed Haptic Patch Transmits Touch Sensations to Skin - Northwestern University engineers have developed a haptic device which can deliver various sensations, including vibrations, pressure and twisting.
2 - Neurode: The Wearable ADHD Management Device Without Invasive Procedures - Neurode offers an alternative to traditional ADHD medications by using light electrical stimulation targeting the brain's prefrontal cortex.
3 - AI-Enhanced Wearable Enables Speech Without Vocal Cords - An adhesive neck patch translates signals into audible speech in speech technology for people with disabilities.
Page Information, Citing and Disclaimer
Disabled World is a comprehensive online resource that provides information and news related to disabilities, assistive technologies, and accessibility issues. Founded in 2004 our website covers a wide range of topics, including disability rights, healthcare, education, employment, and independent living, with the goal of supporting the disability community and their families.
Cite This Page (APA): Northwestern University. (2024, November 6). Bistable Designed Haptic Patch Transmits Touch Sensations to Skin. Disabled World. Retrieved December 10, 2024 from www.disabled-world.com/assistivedevices/bioelastic.php
Permalink: <a href="https://www.disabled-world.com/assistivedevices/bioelastic.php">Bistable Designed Haptic Patch Transmits Touch Sensations to Skin</a>: Northwestern University engineers have developed a haptic device which can deliver various sensations, including vibrations, pressure and twisting.
While we strive to provide accurate and up-to-date information, it's important to note that our content is for general informational purposes only. We always recommend consulting qualified healthcare professionals for personalized medical advice. Any 3rd party offering or advertising does not constitute an endorsement.