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Deployable and Stiffness-Variable Miniature Actuator with Water Circulation Channel and Shape Memory Polymer.

Toshiro Yamanaka1, Taosong Yu2, Tengo Yoshie3

  • 1Department of Bioengineering, School of Engineering, The University of Tokyo, Bunkyo, Japan.

Soft Robotics
|March 26, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel miniature actuator for gastrointestinal (GI) medical procedures. The soft actuator offers deployability, retractivity, and variable stiffness for safer and more effective interventions within the GI tract.

Keywords:
deformation model and endoscopic submucosal dissectionminiature actuatorshape memory polymerthermal modelvariable stiffnesswater circulation

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Area of Science:

  • Biomedical Engineering
  • Gastroenterology
  • Materials Science

Background:

  • Medical interventions in the gastrointestinal (GI) tract face challenges with accessibility and operability.
  • Existing tools lack the necessary deployability, retractivity, and variable stiffness for delicate GI tissues.

Purpose of the Study:

  • To develop a novel miniature soft actuator for improved medical applications within the GI tract.
  • To create an actuator with deployability, retractivity, and variable stiffness for safe tissue interaction.

Main Methods:

  • Designed a miniature actuator using a shape memory polymer bar and a water-circulating flexible channel.
  • Established physical models for actuator design and developed fabrication methods for prototypes.
  • Evaluated thermal response, retractive deformation, and variable stiffness performance.

Main Results:

  • Confirmed the actuator's deployability, retractivity, and stiffness-varying capabilities through continuous actuation demonstrations.
  • Validated the concept's effectiveness in a case study for endoscopic submucosal dissection traction.
  • Demonstrated the actuator's potential for interacting with delicate tissues.

Conclusions:

  • The proposed deployable and stiffness-variable miniature actuator is a viable solution for GI tract medical applications.
  • The design methodology and actuator mechanism can advance the development of other medical tools for delicate tissue interaction.