Flow-Driven Magnetic Microcatheter Enables Superselective Arterial Embolization in Distal Vasculature

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Summary of Science Robotics https://doi.org/10.1126/scirobotics.adu4003  
Dr. Lucio Pancaldi  et al.

Points

Researchers developed an ultraminiaturized magnetic microcatheter designed as an inflatable flat tube that overcomes the mechanical limitations of conventional endovascular instruments.
This innovative microcatheter is ultraflexible and harnesses the kinetic energy of natural blood flow for safe navigation into hard-to-reach distal vasculature.
In a porcine model, the device achieved superselective access to tortuous arteries as small as 180 micrometers in diameter with a tight curvature radius of 0.69 millimeters.
The magnetic steering platform is compatible with standard biplane fluoroscope imaging and was used to demonstrate precise infusion of contrast and embolic liquid agents.
This flow-driven technology has broad potential for superselective arterial embolization, diagnosis, and targeted drug or gene delivery throughout the central, peripheral, and other organ systems.

Summary

This research introduces an ultraminiaturized flow-driven magnetic microcatheter designed to overcome the mechanical limitations of conventional microcatheterization, which restrict access to distal and tortuous segments of the brain vasculature. The new design features an inflatable flat tube microengineered with magnetic properties, enabling exceptional flexibility and the ability to harness blood flow for navigation. This approach eliminates the diameter and stiffness constraints of traditional push-wire techniques, which have limited minimally invasive access to distal vessels.

The study demonstrates the device’s functionality using a compact magnetic steering platform compatible with standard biplane fluoroscope imaging. In a porcine model, researchers achieved safe and precise navigation into distal, highly tortuous arteries, reaching vessels as small as 180 micrometers in diameter with curvature radii as small as 0.69 millimeters. The experiments also demonstrated the device’s ability to perform superselective infusion of contrast and embolic liquid agents, confirming its potential for treating complex cerebrovascular conditions such as aneurysms and arteriovenous malformations.

These results represent a major advancement in endovascular technology, enabling diagnosis and treatment in previously inaccessible regions of the vasculature. Moreover, the platform’s ability to deliver agents with high precision suggests broad applications in targeted drug and gene delivery across multiple organ systems.

Link to the article: https://www.science.org/doi/10.1126/scirobotics.adu4003

References

Pancaldi, L., Özelçi, E., Gadiri, M. A., Raub, J., Mosimann, P. J., & Sakar, M. S. (2025). Flow-driven magnetic microcatheter for superselective arterial embolization. Science Robotics, 10(107), eadu4003. https://doi.org/10.1126/scirobotics.adu4003