一种用于靶向给药、实时X射线成像和微型机器人回收的磁导向自卷式微型机器人。

A Magnetically Guided Self-Rolled Microrobot for Targeted Drug Delivery, Real-Time X-Ray Imaging, and Microrobot Retrieval.

作者信息

Nguyen Kim Tien, Go Gwangjun, Jin Zhen, Darmawan Bobby Aditya, Yoo Ami, Kim Seokjae, Nan Minghui, Lee Sang Bong, Kang Byungjeon, Kim Chang-Sei, Li Hao, Bang Doyeon, Park Jong-Oh, Choi Eunpyo

机构信息

Korea Institute of Medical Microrobotics, 43-26, Cheomdangwagi-ro 208-beon-gil, Buk-gu, Gwangju, 61011, South Korea.

School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, South Korea.

出版信息

Adv Healthc Mater. 2021 Mar;10(6):e2001681. doi: 10.1002/adhm.202001681. Epub 2021 Jan 27.

Abstract

Targeted drug delivery using a microrobot is a promising technique capable of overcoming the limitations of conventional chemotherapy that relies on body circulation. However, most studies of microrobots used for drug delivery have only demonstrated simple mobility rather than precise targeting methods and prove the possibility of biodegradation of implanted microrobots after drug delivery. In this study, magnetically guided self-rolled microrobot that enables autonomous navigation-based targeted drug delivery, real-time X-ray imaging, and microrobot retrieval is proposed. The microrobot, composed of a self-rolled body that is printed using focused light and a surface with magnetic nanoparticles attached, demonstrates the loading of doxorubicin and an X-ray contrast agent for cancer therapy and X-ray imaging. The microrobot is precisely mobilized to the lesion site through automated targeting using magnetic field control of an electromagnetic actuation system under real-time X-ray imaging. The photothermal effect using near-infrared light reveals rapid drug release of the microrobot located at the lesion site. After drug delivery, the microrobot is recovered without potential toxicity by implantation or degradation using a magnetic-field-switchable coiled catheter. This microrobotic approach using automated control method of the therapeutic agents-loaded microrobot has potential use in precise localized drug delivery systems.

摘要

使用微型机器人进行靶向给药是一种很有前景的技术,能够克服依赖身体循环的传统化疗的局限性。然而,大多数用于药物递送的微型机器人研究仅展示了简单的移动性,而非精确的靶向方法,也未证明给药后植入的微型机器人可生物降解的可能性。在本研究中,提出了一种磁导向自卷式微型机器人,它能够实现基于自主导航的靶向给药、实时X射线成像以及微型机器人回收。该微型机器人由通过聚焦光打印的自卷式主体和附着有磁性纳米颗粒的表面组成,展示了用于癌症治疗和X射线成像的阿霉素和X射线造影剂的负载。在实时X射线成像下,通过电磁驱动系统的磁场控制自动靶向,微型机器人被精确地移动到病变部位。利用近红外光的光热效应显示位于病变部位的微型机器人能快速释放药物。给药后,使用磁场可切换的螺旋导管通过植入或降解回收微型机器人,而不会产生潜在毒性。这种使用装载治疗剂的微型机器人自动控制方法的微型机器人方法在精确局部给药系统中具有潜在用途。

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