Researchers have found a way to bind engineered skin tissue to the complex forms of humanoid robots | Perforation-type anchors inspired by skin ligament for robotic face covered with living skin

Press release excerpts:

>This brings with it potential benefits to robotic platforms such as increased mobility, self-healing abilities, embedded sensing capabilities and an increasingly lifelike appearance. Taking inspiration from human skin ligaments, the team, led by Professor Shoji Takeuchi of the University of Tokyo, included special perforations in a robot face, which helped a layer of skin take hold. Their research could be useful in the cosmetics industry and to help train plastic surgeons.
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>Takeuchi is a pioneer in the field of biohybrid robotics, where biology and mechanical engineering meet. So far, his lab, the Biohybrid Systems Laboratory, has created mini robots that walk using biological muscle tissue, 3D printed lab-grown meat, engineered skin that can heal, and more. It was during research on the last of these items that Takeuchi felt the need to take the idea of robotic skin further to improve its properties and capabilities.
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>“During previous research on a finger-shaped robot covered in engineered skin tissue we grew in our lab, I felt the need for better adhesion between the robotic features and the subcutaneous structure of the skin,” said Takeuchi. “By mimicking human skin-ligament structures and by using specially made V-shaped perforations in solid materials, we found a way to bind skin to complex structures. The natural flexibility of the skin and the strong method of adhesion mean the skin can move with the mechanical components of the robot without tearing or peeling away.”
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>“In this study, we managed to replicate human appearance to some extent by creating a face with the same surface material and structure as humans,” said Takeuchi. “Additionally, through this research, we identified new challenges, such as the necessity for surface wrinkles and a thicker epidermis to achieve a more humanlike appearance. We believe that creating a thicker and more realistic skin can be achieved by incorporating sweat glands, sebaceous glands, pores, blood vessels, fat and nerves. Of course, movement is also a crucial factor, not just the material, so another important challenge is creating humanlike expressions by integrating sophisticated actuators, or muscles, inside the robot. Creating robots that can heal themselves, sense their environment more accurately and perform tasks with humanlike dexterity is incredibly motivating.”

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Link to the journal article:

[Perforation-type anchors inspired by skin ligament for robotic face covered with living skin](https://www.cell.com/cell-reports-physical-science/fulltext/S2666-3864(24)00335-7)

Summary:

>Skin equivalent, a living skin model composed of cells and extracellular matrix, possesses the potential to be an ideal covering material for robots due to its biological functionalities. To employ skin equivalents as covering materials for robots, a secure method for attaching them to the underlying structure is required. In this study, we develop and characterize perforation-type anchors inspired by the structure of skin ligaments as a technique to effectively adhere skin equivalents to robotic surfaces. To showcase the versatility of perforation-type anchors in three-dimensional (3D) coverage applications, we cover a 3D facial mold with intricate surface structure with skin equivalent using perforation-type anchors. Furthermore, we construct a robotic face covered with dermis equivalent, capable of expressing smiles, with actuation through perforation-type anchors. With the above results, this research introduces an approach to adhere and actuate skin equivalents with perforation-type anchors, potentially contributing to advancements in biohybrid robotics.

It’s about time. I often pondered why it was taking so long.