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Regeneration is the process of restoring injured or lost tissues, organs, or body parts. While simpler organisms generally show greater ability to regenerate their whole body, few complex animals show similarly exceptional regeneration. For example, planarian flatworms have a unique regenerative potential making them a popular study organism among biologists to understand the mechanisms of whole body regeneration. Other organisms, such as hydra, also show extreme regeneration potential; even...
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Rehabilitation exercise-driven symbiotic electrical stimulation system accelerating bone regeneration.

Tianlong Wang1,2, Han Ouyang3, Yiping Luo1,2

  • 1Center for Orthopaedic Science and Translational Medicine, Department of Orthopedics, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai 200072, China.

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This study introduces a battery-free, implantable electrical stimulation system for bone healing. The device accelerates bone regeneration and mineralization, offering a lightweight solution for enhanced patient recovery.

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Materials Science

Background:

  • Electrical stimulation accelerates bone healing but current devices are bulky and heavy.
  • Developing lightweight, flexible implantable stimulators for bone regeneration remains a challenge.

Purpose of the Study:

  • To develop a self-powered, implantable microelectronic stimulator for bone regeneration without circuits or batteries.
  • To evaluate the efficacy of the developed system in promoting bone defect repair.

Main Methods:

  • A hybrid triboelectric/piezoelectric nanogenerator was combined with a conductive bioactive hydrogel to create the bone defect electrical stimulation (BD-ES) system.
  • The BD-ES system generates biphasic electric pulses in response to rehabilitation exercise.
  • The system's effect on osteogenesis-related biological processes and bone healing was assessed in a rat femoral defect model.

Main Results:

  • The BD-ES system enhanced calcium ion import and osteogenic differentiation.
  • Complete healing of critical-sized femoral defects in rats was achieved within 6 weeks.
  • The system demonstrated effective bone defect reversal and mineralization.

Conclusions:

  • The developed self-powered BD-ES system offers a lightweight and flexible solution for electrical stimulation therapy in bone regeneration.
  • This battery-free and circuit-free technology advances the development of symbiotic electrical stimulation devices for enhanced bone healing.