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Related Experiment Video

Updated: Oct 19, 2025

Fabrication of Mechanically Tunable and Bioactive Metal Scaffolds for Biomedical Applications
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Solution-based fabrication of mechanically transformative materials for implantable applications.

Xinxin Zhang1, Anwei Zhou2,3, Gaohua Hu4,5

  • 1College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China. metrc@sdust.edu.cn.

Biomaterials Science
|September 20, 2021
PubMed
Summary

Researchers developed a new fabrication method for mechanically transformative materials using gallium and elastomers. This innovation enables the creation of implantable biomedical devices, like needles, with tunable stiffness for easier insertion and improved biocompatibility during long-term use.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Implantable probes require a balance of stiffness for insertion and flexibility for biocompatibility.
  • Current rigid probes cause inflammation, while soft probes are difficult to insert deeply.
  • Mechanically transformative materials offer tunable stiffness but lack facile fabrication methods.

Purpose of the Study:

  • To develop a scalable, solution-based fabrication technique for gallium-based mechanically transformative materials.
  • To create complex 3D features, such as sharp-tipped needles, for biomedical applications.
  • To demonstrate the in vivo utility and biocompatibility of these materials for chronic implantation.

Main Methods:

  • A solution-based coating process utilizing patterned copper films to create gallium features.
  • Encapsulation of gallium features with elastomers to form mechanically transformative materials.
  • Control of gallium feature geometry via 2D copper pattern design.

Main Results:

  • Achieved bistable mechanical properties with a five-orders-of-magnitude modulus modulation.
  • Fabricated mechanically transformative indwelling needles with sharp tips.
  • Demonstrated successful in vivo implantation for long-term chemotherapy delivery.

Conclusions:

  • The developed method enables scalable fabrication of complex gallium-based mechanically transformative materials.
  • These materials are suitable for creating advanced implantable biomedical devices with tunable mechanical properties.
  • Mechanically transformative materials show promise for chronic implantable systems due to their biocompatibility and performance.