Grasp and force based taxonomy of split-hook prosthetic terminal devices

Area of Science:

• Rehabilitation Engineering
• Biomechanics
• Prosthetics

Background:

• The body-powered split-hook terminal device is the most common upper-limb prosthesis.
• Understanding its use is crucial for improving prosthetic design and function.

Purpose of the Study:

• To develop and present two novel taxonomies for classifying the use of body-powered split-hook terminal devices.
• To establish a standardized language for describing grasp types and force exertion in upper-limb prosthetics.
• To provide a framework for comparing split-hook capabilities with advanced prostheses and human hands.

Main Methods:

• Development of two distinct taxonomies: one for grasp shape and one for force exertion.
• Analysis of video data from an amputee performing common activities with a split-hook prosthesis.
• Classification of grasp types based on environmental contact and force exertion methods.

Main Results:

• The developed taxonomies categorize various grasp shapes and force exertion methods used with split-hook prostheses.
• The study differentiates between grasps for holding versus acquiring objects.
• Non-prehensile uses of the split-hook were identified as important.

Conclusions:

• The proposed taxonomies offer a common language for split-hook use, facilitating detailed study and comparison.
• These classifications can guide developers in creating more effective and versatile upper-limb prosthetic terminal devices.
• Further research into split-hook functionality can lead to enhanced prosthetic designs.