Design and Applications of Magnetically Actuated Microrobots in Endovascular Embolization

Clinical Snapshot

Key Findings

• P Value: Not reported — no statistical testing performed

• Effect Size: Not reported — no pooled quantitative effect size presented

• Primary Outcome: Narrative synthesis of design strategies, validation models, imaging systems, and magnetic actuation technologies for embolic microrobots in endovascular embolization — no primary quantitative outcome reported

• Nnt Or Sensitivity: Not applicable — no NNT, sensitivity/specificity, or hazard ratio calculable from a narrative review of predominantly preclinical data

• Confidence Interval: Not reported — no confidence intervals provided

Clinical Application

Clinical feasibility remains unproven. The technology requires resolution of significant translational barriers including biocompatibility certification, in vivo magnetic field safety validation, real-time imaging integration, miniaturisation to clinically relevant scales, sterilisation protocols, and regulatory approval pathways. Transition from bench to bedside is likely a 5–15 year horizon. In Australia, endovascular embolization is performed across major tertiary centres under interventional radiology and neurosurgery services. Current embolic agents (coils, Onyx, NBCA, microspheres) are TGA-registered and PBS-listed for specific indications. Magnetically actuated microrobots are not TGA-approved and have no current PBS pathway. The RACGP and relevant specialist colleges (RANZCR, ANZAN) have no current guidelines addressing microrobot-assisted embolization. Australian adoption would require TGA Class III medical device approval, prospective clinical trial evidence, and health technology assessment through the Medical Services Advisory Committee (MSAC). Research collaboration opportunities exist through the Australian Research Council and NHMRC for preclinical translation programmes. Patients undergoing endovascular embolization for conditions including cerebral aneurysms, arteriovenous malformations, hepatocellular carcinoma (transarterial embolization), uterine fibroids, and peripheral vascular malformations — however, direct clinical application is not yet established given the preclinical stage of the technology

Abstract

Endovascular embolization is one of the core techniques in minimally invasive interventional medicine. It allows catheters to be accurately delivered to target blood vessels under image guidance for the implantation of embolic materials to achieve vascular occlusion. Although this technique has become increasingly mature, it still faces major challenges in precise delivery due to the limitations of embolic-agent properties and design concepts, restricting further improvement of the embolization therapeutic efficacy. Driven by continuous breakthroughs in materials science and control engineering, as well as the inevitable trend of medical development toward miniaturization, precision, and intelligence, microrobots show broad application prospects in precision disease treatment. They present advantages in accurate embolization and remote control in endovascular embolization, which can effectively improve embolization outcomes and reduce the risk of ectopic embolism. Taking the embolic microrobot system as the research focus, this paper systematically elaborates the design strategies, validation models, and practical applications of magnetically actuated embolic microrobots, comprehensively evaluates various imaging systems, and summarizes the supporting magnetic actuation technologies. It concludes the multimodule collaboration and adaptation framework of embolic microrobot systems. Finally, it analyzes the current limitations and potential translational challenges and presents a systematic prospect of its future development trends.

References

1. 1.Lv, X., Sun, Y., Lu, Y., Zhou, J., Cao, Y., Wang, Q., & Xiong, F. (2026). Design and applications of magnetically actuated microrobots in endovascular embolization. ACS Nano. Advance online publication. https://doi.org/10.1021/acsnano.6c04864