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Soft Capsule Magnetic Millirobots for Region-Specific Drug Delivery in the Central Nervous System
Lamar O Mair1, Georges Adam2, Sagar Chowdhury1,2
1Weinberg Medical Physics, Inc., North Bethesda, MD, United States.
Frontiers in Robotics and AI
|August 9, 2021
Summary
Soft microrobots can now walk on delicate central nervous system (CNS) tissues. These alginate capsules precisely deliver small molecules to multiple locations, minimizing tissue damage for potential medical applications.
Area of Science:
- Biomedical Engineering
- Robotics
- Materials Science
Background:
- Soft robotic systems offer potential for medical applications, particularly for targeted drug delivery.
- Existing microrobots often struggle with locomotion on dense biological tissues, limiting their in-body applications.
- Tumbling microrobots, guided by magnetic fields, represent a promising approach for surface locomotion.
Purpose of the Study:
- To develop and demonstrate soft microrobots capable of navigating and delivering payloads on sensitive central nervous system (CNS) tissues.
- To assess the feasibility of precise, multi-location delivery of small molecules onto neural tissues.
- To evaluate the safety and efficacy of soft alginate-based microrobots in preventing tissue damage.
Main Methods:
- Fabrication of soft alginate capsules designed for microrobotic locomotion.
- Utilizing rotating magnetic fields to actuate and guide the tumbling microrobots on tissue surfaces.
- Performing ex vivo experiments on rat cortex and mouse spinal cord to demonstrate locomotion and payload delivery.
- Quantifying the spatial specificity and multi-location delivery capabilities of the microrobots.
Main Results:
- Successfully demonstrated surface walking of soft alginate microrobots on rat cortex and mouse spinal cord ex vivo.
- Achieved precise, multi-location delivery of small molecules to up to six distinct sites on each tissue type.
- Confirmed that the soft nature of alginate gel minimizes frictional damage to delicate CNS tissues during locomotion.
Conclusions:
- Soft alginate microrobots are capable of safe and precise locomotion and payload delivery on CNS tissues.
- This technology holds significant promise for future clinical and preclinical applications, including targeted drug delivery, neural stimulation, and diagnostic imaging.
- The development addresses a critical need for microrobotic systems that can operate effectively within the complex environment of the human body.
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