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Figure 4. Small-scale magnetic soft robots for clinical applications in the vascular system. (A) Schematic and experimental demonstration of a magnetic soft robot integrated with shape memory polymer (SMP)-based foldable structures for localized, on-demand drug delivery. Active locomotion within porcine arterial vessels has been validated through ultrasound imaging^[77]. Copyright 2022 Springer Nature; (B) Experimental workflow demonstrating magnetic soft robot-assisted thromboextraction^[191]. Copyright 2022 American Chemical Society; (C) Conceptual schematic of a multifunctional magnetic microfiberbot capable of anchoring to vessel walls, navigating via helical propulsion, elongating to traverse narrow vasculature, and aggregating to achieve targeted flow occlusion. This system serves both as an embolic agent for coil embolization of aneurysms and tumors and as a protective device for selective particle embolization^[78]. Copyright 2024 American Association for the Advancement of Science.