News Release

Robot skin heals

A robotic finger with living skin tissue points to future manufacturing methods

Peer-Reviewed Publication

University of Tokyo

Robotic finger

image: Illustration showing the cutting and healing process of the robotic finger (A), its anchoring structure (B) and fabrication process (C). view more 

Credit: ©2022 Takeuchi et al.

Researchers from the University of Tokyo pool knowledge of robotics and tissue culturing to create a controllable robotic finger covered with living skin tissue. The robotic digit had living cells and supporting organic material grown on top of it for ideal shaping and strength. As the skin is soft and can even heal itself, so could be useful in applications that require a gentle touch but also robustness. The team aims to add other kinds of cells into future iterations, giving devices the ability to sense as we do.

Professor Shoji Takeuchi is a pioneer in the field of biohybrid robots, the intersection of robotics and bioengineering. Together with researchers from around the University of Tokyo, he explores things such as artificial muscles, synthetic odor receptors, lab-grown meat, and more. His most recent creation is both inspired by and aims to aid medical research on skin damage such as deep wounds and burns, as well as help advance manufacturing.

“We have created a working robotic finger that articulates just as ours does, and is covered by a kind of artificial skin that can heal itself,” said Takeuchi. “Our skin model is a complex three-dimensional matrix that is grown in situ on the finger itself. It is not grown separately then cut to size and adhered to the device; our method provides a more complete covering and is more strongly anchored too.”

Three-dimensional skin models have been used for some time for cosmetic and drug research and testing, but this is the first time such materials have been used on a working robot. In this case, the synthetic skin is made from a lightweight collagen matrix known as a hydrogel, within which several kinds of living skin cells called fibroblasts and keratinocytes are grown. The skin is grown directly on the robotic component which proved to be one of the more challenging aspects of this research, requiring specially engineered structures that can anchor the collagen matrix to them, but it was worth it for the aforementioned benefits.

“Our creation is not only soft like real skin but can repair itself if cut or damaged in some way. So we imagine it could be useful in industries where in situ repairability is important as are humanlike qualities, such as dexterity and a light touch,” said Takeuchi. “In the future, we will develop more advanced versions by reproducing some of the organs found in skin, such as sensory cells, hair follicles and sweat glands. Also, we would like to try to coat larger structures.”

The main long-term aim for this research is to open up new possibilities in advanced manufacturing industries. Having humanlike manipulators could allow for the automation of things currently only achievable by highly skilled professionals. Other areas such as cosmetics, pharmaceuticals and regenerative medicine could also benefit. This could potentially reduce cost, time and complexity of research in these areas and could even reduce the need for animal testing.

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Journal article: Michio Kawai, Minghao Nie, Haruka Oda, Yuya Morimoto, Shoji Takeuchi, “Living skin on a robot”, Cell Press, DOI: 10.1016/j.matt.2022.05.019

Funding: JSPS Grants-in-Aid for Scientific (KAKENHI), Grant Numbers 16H06329, 21H00321, 21H05013 and 19H04508. JSPS Grant-in-Aid for Early-Career Scientists (KAKENHI), Grant Number 19K15415.

Useful links:

Graduate School of Information Science and Technology
https://www.i.u-tokyo.ac.jp/index_e.shtml
Biohybrid Systems Laboratory

http://www.hybrid.t.u-tokyo.ac.jp/en/

Institute of Industrial Science

https://www.iis.u-tokyo.ac.jp/en/

Department of Mechano-Informatics

https://www.i.u-tokyo.ac.jp/edu/course/m-i/index_e.shtml

Video on previous research

https://youtu.be/RMW_JJTOnUE

 

Research contact:
Professor Shoji Takeuchi
Graduate School of Information Science and Technology, The University of Tokyo,
7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
takeuchi@hybrid.t.u-tokyo.ac.jp

Press contact:
Mr Rohan Mehra
Public Relations Group, The University of Tokyo,
7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
press-releases.adm@gs.mail.u-tokyo.ac.jp

About The University of Tokyo
The University of Tokyo is Japan's leading university and one of the world's top research universities. The vast research output of some 6,000 researchers is published in the world's top journals across the arts and sciences. Our vibrant student body of around 15,000 undergraduate and 15,000 graduate students includes over 4,000 international students. Find out more at www.u-tokyo.ac.jp/en/ or follow us on Twitter at @UTokyo_News_en.


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