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This study introduces a new mechanics-based model for hybrid continuum robots, combining tendon actuation and concentric tubes. Relative twisting between tubes significantly influences the robot's shape, crucial for medical applications.

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Area of Science:

  • Robotics
  • Mechanical Engineering
  • Medical Device Design

Background:

  • Mechanics-based models exist for tendon-actuated continuum robots and concentric tube robots separately.
  • Existing models do not address hybrid designs combining both tendon actuation and concentric tubes.
  • These hybrid robots are relevant for medical applications like endoscopy and intracardiac procedures.

Purpose of the Study:

  • To derive a mechanics-based model for hybrid tendon-actuated concentric tube robots.
  • To assess the model's accuracy using numerical and physical experiments.
  • To understand the key factors influencing the shape of these hybrid robots.

Main Methods:

  • Development of a novel mechanics-based model integrating tendon forces and moments with concentric tube configurations.
  • Numerical simulations to predict robot shape based on the derived model.
  • Physical experiments using a pair of tendon-actuated tubes to validate model predictions.

Main Results:

  • The derived model accurately describes the shape of tendon-actuated concentric tube robots.
  • Numerical and physical experiments confirm the model's validity.
  • Relative twisting between the tendon-actuated tubes was identified as a critical factor in determining the robot's overall shape.

Conclusions:

  • A validated mechanics-based model for hybrid tendon-actuated concentric tube robots has been established.
  • The model provides a foundation for designing and controlling these robots in medical applications.
  • Relative tube twisting is a key design parameter for controlling robot shape, analogous to concentric tube robots.