Development of a prototype over-actuated biomimetic prosthetic hand

Area of Science:

• Biomedical Engineering
• Robotics
• Prosthetics

Background:

• Current prosthetic hands lack dexterity and are often heavy, failing to meet amputee needs.
• Limited grasping capabilities and discomfort hinder the quality of life for individuals with hand amputations.

Purpose of the Study:

• To develop a dexterous prosthetic hand that better simulates natural human hand function.
• To address limitations of existing prosthetics regarding grasp variety, weight, and user comfort.

Main Methods:

• Designed an over-actuated mechanism with intrinsic joint-mounted motors and a finger tendon for actuation.
• Integrated a novel actuation method to enable small actuators for grasp shaping and high grip strength.
• Focused on achieving natural finger motion, human-like appearance, and improved mass distribution.

Main Results:

• The prosthetic hand demonstrated fingertip flexion force adequate for most activities of daily living.
• Achieved a range of grasp shapes with independent finger motion and a natural appearance.
• Exhibited mass distribution closer to a natural limb, reducing user discomfort.

Conclusions:

• The developed prosthetic hand offers enhanced dexterity, strength, and comfort compared to existing devices.
• This novel design represents a significant advancement in prosthetic hand technology for amputees.
• The improved functionality and aesthetics contribute to better physical and mental recuperation.