Reinforcement Learning Enables Autonomous Microrobot Navigation and Intervention in Simulated Blood Capillaries
Researchers developed a physically grounded simulation of a blood capillary network, training deep RL agents to navigate via chemotaxis. They systematically mapped the physical limits of navigation, discovered a forbidden regime, and observed agents independently discovering multiple universal strategies. Without retraining, agents perform targeted blocking and unblocking of capillary flow, restoring throughput to healthy baseline levels.
[2606.26154] Reinforcement Learning Enables Autonomous Microrobot Navigation and Intervention in Simulated Blood Capillaries
[Submitted on 23 Jun 2026]
Title:Reinforcement Learning Enables Autonomous Microrobot Navigation and Intervention in Simulated Blood Capillaries
View a PDF of the paper titled Reinforcement Learning Enables Autonomous Microrobot Navigation and Intervention in Simulated Blood Capillaries, by Jannik Drotleff and 6 other authors
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Abstract:Autonomous microrobots navigating biological vasculature could enable targeted drug delivery and thrombolysis, yet training control policies for realistic environments remains an open challenge. Prior reinforcement learning (RL) studies of microrobotic navigation have been limited to idealized geometries that omit complex hydrodynamic flow fields, confined branching structures, and dense cellular obstacles found in vivo. Here, we develop a physically grounded simulation of a blood capillary network, incorporating realistic hydrodynamic flow fields, explicit red blood cell dynamics, and anatomically derived branching geometry, and train deep RL agents to navigate it via chemotaxis. We systematically map the physical limits of navigation across robot size and swimming speed, revealing a forbidden regime where Brownian motion and flow overcome propulsion. Successful agents independently discover multiple universal strategy types, including run-and-rotate and energy-efficient search-and-sit policies, regardless of robot parameters. Without retraining, these agents perform targeted blocking and unblocking of capillary flow, restoring throughput to healthy baseline levels. These results establish RL as a viable framework for developing autonomous microrobotic intervention strategies in complex biological environments.
Comments: 12 pages, 4 figures
Subjects:
Robotics (cs.RO); Machine Learning (cs.LG); Biological Physics (physics.bio-ph)
Cite as: arXiv:2606.26154 [cs.RO]
(or arXiv:2606.26154v1 [cs.RO] for this version)
https://doi.org/10.48550/arXiv.2606.26154
arXiv-issued DOI via DataCite
Submission history
From: Jannik Drotleff [view email] [v1] Tue, 23 Jun 2026 12:21:18 UTC (1,377 KB)
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