Bubble-Based Microrobots with Rapid Circular Motions for Epithelial Pinning and Drug Delivery.

Autor: Lee JG; Department of Chemical and Biological Engineering, University of Colorado Boulder 3415 Colorado Ave, Boulder, CO, 80303, USA., Raj RR; Department of Chemical and Biological Engineering, University of Colorado Boulder 3415 Colorado Ave, Boulder, CO, 80303, USA., Thome CP; Department of Chemical and Biological Engineering, University of Colorado Boulder 3415 Colorado Ave, Boulder, CO, 80303, USA., Day NB; Department of Chemical and Biological Engineering, University of Colorado Boulder 3415 Colorado Ave, Boulder, CO, 80303, USA., Martinez P; Department of Mechanical Engineering, University of Colorado Boulder, 1111 Engineering Drive, UCB 427, Boulder, CO, 80309, USA.; Biomedical Engineering Program, University of Colorado Boulder, 1111 Engineering Drive, UCB 422, Boulder, CO, 80309, USA., Bottenus N; Department of Mechanical Engineering, University of Colorado Boulder, 1111 Engineering Drive, UCB 427, Boulder, CO, 80309, USA.; Biomedical Engineering Program, University of Colorado Boulder, 1111 Engineering Drive, UCB 422, Boulder, CO, 80309, USA., Gupta A; Department of Chemical and Biological Engineering, University of Colorado Boulder 3415 Colorado Ave, Boulder, CO, 80303, USA., Wyatt Shields C 4th; Department of Chemical and Biological Engineering, University of Colorado Boulder 3415 Colorado Ave, Boulder, CO, 80303, USA.; Biomedical Engineering Program, University of Colorado Boulder, 1111 Engineering Drive, UCB 422, Boulder, CO, 80309, USA.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2023 Aug; Vol. 19 (32), pp. e2300409. Date of Electronic Publication: 2023 Apr 14.
DOI: 10.1002/smll.202300409
Abstrakt: Remotely powered microrobots are proposed as next-generation vehicles for drug delivery. However, most microrobots swim with linear trajectories and lack the capacity to robustly adhere to soft tissues. This limits their ability to navigate complex biological environments and sustainably release drugs at target sites. In this work, bubble-based microrobots with complex geometries are shown to efficiently swim with non-linear trajectories in a mouse bladder, robustly pin to the epithelium, and slowly release therapeutic drugs. The asymmetric fins on the exterior bodies of the microrobots induce a rapid rotational component to their swimming motions of up to ≈150 body lengths per second. Due to their fast speeds and sharp fins, the microrobots can mechanically pin themselves to the bladder epithelium and endure shear stresses commensurate with urination. Dexamethasone, a small molecule drug used for inflammatory diseases, is encapsulated within the polymeric bodies of the microrobots. The sustained release of the drug is shown to temper inflammation in a manner that surpasses the performance of free drug controls. This system provides a potential strategy to use microrobots to efficiently navigate large volumes, pin at soft tissue boundaries, and release drugs over several days for a range of diseases.
(© 2023 Wiley-VCH GmbH.)
Databáze: MEDLINE
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