Hybrid Soft-Rigid Actuators for Minimally Invasive Surgery

Area of Science:

• Robotics
• Biomedical Engineering
• Fluid Mechanics

Background:

• Fluidic mechanisms are crucial for developing compact and powerful actuators in minimally invasive surgery.
• Existing fluidic actuators, elastic and piston-cylinder types, have limitations such as low force/displacement or friction and maintenance issues.
• A hybrid soft-rigid actuation approach is proposed to combine the advantages of existing fluidic solutions.

Purpose of the Study:

• To introduce a novel design of hybrid soft-rigid actuators.
• To enable pitch and roll degrees of freedom for miniature robotic arms.
• To overcome limitations of current fluidic actuators while maintaining their benefits.

Main Methods:

• Development of a novel hybrid soft-rigid actuation design.
• Integration of these actuators as basic mechanical joints for a miniature robotic arm.
• Experimental evaluation of the actuator's force and displacement capabilities.

Main Results:

• Achieved forces of 1.4 N and 2.77 N for pitch and roll joints, respectively.
• Demonstrated potential for even higher performance, up to 3 N, with further optimization.
• Highlighted the compact, powerful, and low-cost nature of the hybrid actuators.

Conclusions:

• The proposed hybrid soft-rigid actuators offer a promising solution for miniature robotic arms and other applications.
• This design overcomes the drawbacks of traditional fluidic actuators, providing enhanced performance.
• The actuators are highly customizable, adaptable, and cost-effective for medical and non-medical uses.