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Updated: Jul 3, 2026
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Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
Published on: April 4, 2013
[Study on active catheter for minimally invasive surgery based on large deflection theory]
Shuguo Wang1, Hao Liu, Yili Fu
1Harbin Institute of Technology BIO-X Center, Harbin 150001, China.
Summary
This study introduces an active catheter for minimally invasive surgery, utilizing shape memory alloy (SMA) actuators for precise control and improved design in medical devices.
Area of Science:
- Medical Devices
- Robotics
- Materials Science
Context:
- Minimally invasive surgery requires precise instrument control.
- Existing active catheters face limitations in dexterity and size.
- Shape memory alloys offer unique actuation properties for medical applications.
Purpose:
- To develop a novel active catheter actuated by shape memory alloy (SMA).
- To achieve a large bending angle without significantly increasing the outer diameter (1.25 mm).
- To establish a theoretical model for predicting catheter behavior and actuator requirements.
Summary:
- A 1.25 mm outer diameter active catheter was designed using multiple bending units actuated by shape memory alloy (SMA).
- Large deflection theory and precise curvature equations were employed to model the catheter's axis deflection.
- Integral transform methods determined SMA actuator length and force for desired tip positioning and joint coordinates.
Impact:
- Provides enhanced control and maneuverability for active catheters in surgical procedures.
- Offers a refined design philosophy for active catheter systems.
- Facilitates improved surgical outcomes through advanced minimally invasive tools.
