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Magnetic soft microfiberbots for robotic embolization
Xurui Liu1,2, Liu Wang3,4, Yuanzhuo Xiang2
1School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China.
Science Robotics
|February 21, 2024
Summary
This study introduces magnetic soft microfiberbots for minimally invasive embolization of cerebral aneurysms and brain tumors. These robots offer enhanced steerability for navigating complex vasculature and treating submillimeter regions.
Area of Science:
- Biomedical Engineering
- Robotics
- Nanotechnology
Background:
- Cerebral aneurysms and brain tumors are significant global health threats.
- Conventional embolization techniques face limitations in navigating complex neurovasculature, especially in submillimeter regions.
- Current methods often suffer from poor catheter steerability, hindering effective treatment delivery.
Purpose of the Study:
- To develop and evaluate novel magnetic soft microfiberbots for robotic embolization in submillimeter neurovascular regions.
- To overcome the limitations of conventional embolization methods through enhanced maneuverability and steerability.
- To demonstrate the feasibility of remote, untethered, magnetically controlled embolization.
Main Methods:
- Fabrication of magnetic soft microfiberbots using thermal drawing of magnetic soft composites.
- Magnetization and molding to create helical magnetic polarity for controlled propulsion.
- Utilizing external magnetic fields for shape morphing (elongated/aggregated) and helical navigation.
- In vitro embolization experiments in neurovascular phantoms (aneurysm and tumor models).
- In vivo embolization study in a rabbit femoral artery model under real-time fluoroscopy.
Main Results:
- Magnetic soft microfiberbots demonstrated high steerability and maneuverability in complex vasculature.
- Reversible shape morphing and helical propulsion were achieved through magnetic field control.
- Successful embolization of aneurysm and tumor models in vitro.
- Effective in vivo embolization in a rabbit femoral artery model.
- The technology shows potential for precise navigation and treatment delivery in submillimeter regions.
Conclusions:
- Magnetic soft microfiberbots offer a promising solution for robotic embolization in challenging neurovascular anatomies.
- The untethered, magnetically controlled approach enhances precision and safety in treating cerebral aneurysms and brain tumors.
- This technology paves the way for advanced robotic embolization strategies in clinical settings.
