Engineering Micromechanical Systems for the Next Generation Wireless Capsule Endoscopy.

Area of Science:

• Biomedical Engineering
• Gastroenterology
• Microrobotics

Background:

• Wireless capsule endoscopy (WCE) is crucial for diagnosing inflammatory bowel diseases like Crohn's disease and ulcerative colitis.
• Current WCE devices lack therapeutic capabilities, necessitating conventional treatments for diagnosed pathologies.
• Targeted drug delivery in the small intestine remains a significant challenge in gastrointestinal treatment.

Purpose of the Study:

• To introduce a next-generation WCE with integrated targeted drug delivery functionality.
• To present a prototype microrobot capable of resisting peristaltic forces and delivering medication.
• To analyze the mechanics of a novel holding mechanism and micropositioning system for targeted therapy.

Main Methods:

• Fabrication of a Nylon 6 prototype microrobot with an integrated holding mechanism.
• Development of a micropositioning system utilizing a single micromotor for needle deployment.
• Mechanical analysis of the holding mechanism and review of microactuators and current WCE technology.

Main Results:

• The microrobot prototype successfully resists peristaltic pressure using an 'anchor' holding mechanism.
• The holding mechanism occupies a minimal volume (347.0 mm³) for an 11.0 mm diameter WCE.
• A micropositioning system enables radial positioning and deployment of a needle for targeted medication delivery (1 mL dose).

Conclusions:

• The developed microrobot demonstrates feasibility for targeted drug delivery within the small intestine.
• This novel functionality significantly enhances WCE capabilities beyond diagnosis to include treatment.
• Future WCE generations equipped with this technology could revolutionize GI tract pathology management.