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This paper presents a material programming approach for designing 4D-printed self-shaping material systems based on biological role models. Plants have inspired numerous adaptive systems that move without using any operating energy; however, these systems are typically designed and fabricated in the form of simplified bilayers. This work introduces computational design methods for 4D-printing bio-inspired behaviors with compounded mechanisms. To emulate the anisotropic arrangement of motile plant structures, material systems are tailored at the mesoscale using extrusion-based 3D-printing. The methodology is demonstrated by transferring the principle of force generation by a twining plant () to the application of a self-tightening splint. Through the tensioning of its stem helix, exhibits a squeezing force on its support to provide stability against gravity. The functional strategies of are abstracted and translated to customized 4D-printed material systems. The squeezing forces of these bio-inspired motion mechanisms are then evaluated. Finally, the function of self-tightening is prototyped in a wrist-forearm splint-a common orthotic device for alignment. The presented approach enables the transfer of novel and expanded biomimetic design strategies to 4D-printed motion mechanisms, further opening the design space to new types of adaptive creations for wearable assistive technologies and beyond.
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http://dx.doi.org/10.1002/advs.202100411 | DOI Listing |
Sci Rep
December 2024
Advanced Manufacturing Institute, King Saud University, Riyadh, 11421, Saudi Arabia.
Recently, social demands for a good quality of life have increased among the elderly and disabled people. So, biomedical engineers and robotic researchers aimed to fuse these techniques in a novel rehabilitation system. Moreover, these models utilized the biomedical signals acquired from the human body's particular organ, cells, or tissues.
View Article and Find Full Text PDFFront Bioeng Biotechnol
December 2024
Orthopedics Department, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine (Guangdong Provincial Hospital of Chinese Medicine), Guangzhou, China.
Background: Anterior tibial laxity is considered to be a risk factor for knee injuries, including anterior cruciate ligament ruptures. The anterior cruciate ligament reconstruction also aims to restore anterior tibial laxity. While anterior tibial laxity is considered to be linked to dynamic knee stability, the mechanisms connecting anterior tibial laxity to these stability issues are not fully understood.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
Key Labs for Advanced Materials, Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road 130, 200237, Shanghai, CHINA.
High-performance polymers based on dynamic chemistry have been widely explored for multi-field advanced applications. However, noncovalent sacrifice bond mediated energy dissipation mechanism causes a trade-off between mechanical toughness and resilience. Herein, we achieved the synchronous boost of seemingly conflicting material properties including mechanical robustness, toughness and elasticity via the incorporation of mechanical chemistry into traditional semi-crystalline networks.
View Article and Find Full Text PDFPhys Rev Lett
December 2024
Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France.
We present a locomotion mechanism that uses the stick-slip transition of a soft passive structure with an internal mechanical resonance. The structure is harmonically driven by a global vertical shaking and, because of its resonance dephasing and the threshold response of stick-slip transition, it can either move forward or backward. We establish a relation for the motion acceleration threshold that we experimentally validate.
View Article and Find Full Text PDFPNAS Nexus
December 2024
Harvard John A. Paulson School of Engineering and Applied Science, Harvard University, Cambridge, MA 02139, USA.
Optimizing mechanical adhesion to specific human tissue types is a field of research that has gained increasing attention over the past two decades due to its utility for diagnostics, therapeutics, and surgical device design. This is especially relevent for medical devices, which could benefit from the presence of attachment mechanisms in order to better target-specific regions of the gastrointestinal (GI) tract or other soft tissues for sensing, sample collection, and drug release. In this work, and inspired by the tissue anchoring adaptations found in diverse parasitic taxa, we present a design and manufacturing platform for the production of a nonintuitive bioinspired millimeter-scale articulated attachment mechanism using laminate fabrication techniques.
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