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Related Concept Videos

Bone Remodeling01:40

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Biohybrid Variable-Stiffness Soft Actuators that Self-Create Bone.

Danfeng Cao1, Jose G Martinez1, Emilio Satoshi Hara2

  • 1Sensor and Actuator Systems, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, 58183, Sweden.

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|December 8, 2021
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Summary
This summary is machine-generated.

Researchers developed biohybrid actuators that change from soft to rigid, mimicking bone growth. These variable-stiffness devices can integrate with bone tissue, offering potential for soft robotics and bone repair.

Keywords:
actuatorsbiohybridsmineralizationvariable stiffness

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Area of Science:

  • Biomaterials Science
  • Robotics Engineering
  • Tissue Engineering

Background:

  • Bone development involves a transition from soft tissue to a rigid, load-bearing structure.
  • Existing actuators often lack the ability to dynamically change stiffness or integrate with biological tissues.
  • Cell-derived plasma membrane nanofragments (PMNFs) have shown potential for mineralization.

Purpose of the Study:

  • To fabricate and characterize bioinduced variable-stiffness actuators.
  • To enable actuators to change properties from soft to rigid, mimicking bone mineralization.
  • To explore applications in soft robotics and bone tissue engineering.

Main Methods:

  • Fabrication of bilayer devices combining polypyrrole and alginate gels functionalized with PMNFs.
  • Induction of mineralization within the alginate gel layer using PMNFs.
  • Characterization of actuator properties, including stiffness change and morphing capabilities.
  • Testing of device integration with bone tissue.

Main Results:

  • Achieved variable-stiffness actuators capable of transitioning from soft to rigid through bioinduced mineralization.
  • Demonstrated programmed directional morphing and a 'frozen state' post-mineralization.
  • Showcased the ability of actuators to adhere and integrate onto bone tissue.
  • Confirmed PMNF-induced mineralization within the gel layer.

Conclusions:

  • Biohybrid variable-stiffness actuators were successfully developed, mimicking natural bone formation.
  • These actuators exhibit tunable stiffness and morphing capabilities, with potential for bone integration.
  • The technology holds promise for advancements in soft robotics and regenerative medicine, particularly for bone repair and tissue engineering.