A research group led by Prof. Xu Tiantian from the Shenzhen Institute of Advanced Technology (SIAT) of the Chinese Academy of Sciences and their collaborators have proposed a magnetically controlled guidewire robot system (MCGRS) with magnetically active steering and autonomous propulsion capabilities.
Vascular interventional surgery is an operation technique that utilizes guidewires, catheters and other instruments to diagnose and treat abnormalities via the vascular route under the guidance of medical imaging equipment. However, this surgery requires a high level of experience from physicians, and they need to observe the position of the guidewire under contrast, which exposes them to accumulated radiation. Moreover, interventional medical resources are scarce in remote areas.
The new system allows physicians to remotely steer the magnetic guidewire, quickly select the correct path through complex vascular bifurcations, and reach the target site, effectively reducing radiation exposure of physicians and supporting for remote areas. The system was proposed based on modeling and trajectory planning methods. The researchers attached a section of magnetic hydrogel material to the tip of the guidewire to make it magnetically responsive, allowing it to be flexibly steered under anCombining the dipole model and the Cosserat-rod model, the team created a continuum mechanics model to predict the tip deformation of the guidewire.
In addition, they confirmed that the proposed model could predict and reconstruct nonlinear deformation of the guidewire tip through magnetic field characterization and steering characterization experiments.
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