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Development of a Capsule Robot for Exploring the Colon.

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This study introduces an enhanced inchworm-like capsule robot (ILCR) for non-invasive colon exploration. The improved robot achieves faster movement and better performance in complex environments.

Keywords:
Inchworm-like capsule robotbody lengthperiodic strokewirelessly controlled and powered

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Area of Science:

  • Robotics
  • Gastroenterology
  • Biomedical Engineering

Background:

  • Existing inchworm-like capsule robots (ILCRs) have limited movement performance in the colon due to its non-structural environment.
  • Non-invasive colon exploration is crucial for diagnostics and treatment.

Purpose of the Study:

  • To develop an enhanced ILCR with improved movement performance for colon exploration.
  • To maximize periodic stroke and minimize body length for better maneuverability.

Main Methods:

  • Designed an axial compact expanding mechanism (EM) and a novel linear mechanism (LM).
  • Integrated a hollow-cylinder-like power source with wireless power transmission (WPT).
  • Tested the enhanced ILCR in ex-vivo colon models with mucus and varying conditions.

Main Results:

  • The enhanced ILCR achieved a 38 mm periodic stroke within a 33 mm body length.
  • The EM and LM operated reliably in a mucus-rich ex-vivo colon.
  • Wireless power transmission provided a stable 3.3 V working voltage.
  • Observed movement velocities of 15.8 cm/min, 12.1 cm/min, and 7.4 cm/min in different colon models.

Conclusions:

  • The enhanced ILCR demonstrates satisfactory movement performance for colon exploration.
  • It promises to complete a 1.5-m colon exploration within 30 minutes.
  • Wireless control and power enhance its potential for non-invasive gastrointestinal procedures.