Rehand: Realistic electric prosthetic hand created with a 3D printer

Area of Science:

• Biomedical Engineering
• Rehabilitation Technology
• Prosthetics

Background:

• Myoelectric prosthetic hands offer cosmetic appearance and grasping function for forearm amputees.
• Existing myoelectric prosthetics face challenges related to weight, aesthetics, and cost.

Purpose of the Study:

• To introduce the Rehand, a novel, realistic, and affordable 3D-printed electric prosthetic hand.
• To evaluate the Rehand's functionality, ease of use, and effectiveness in daily activities.

Main Methods:

• The Rehand utilizes a simple link mechanism with a single linear actuator for grasping.
• 3D printing technology is employed for cost-effective manufacturing and lightweight design.
• A distance sensor-based operating system provides intuitive control, mimicking myoelectric systems.
• A supporter socket facilitates easy donning and doffing of the prosthetic hand.

Main Results:

• The Rehand achieves a realistic appearance comparable to cosmetic prosthetics.
• The design ensures low cost, light weight, and simplified maintenance.
• The distance sensor system offers natural operability.
• Southampton Hand Assessment Procedure (SHAP) evaluation confirmed the amputee's ability to manipulate objects and perform daily tasks.

Conclusions:

• The 3D-printed Rehand presents a viable solution to the limitations of conventional myoelectric prosthetics.
• It offers a blend of realistic aesthetics, functional grasping, and user-friendly operation at a reduced cost.
• The Rehand empowers amputees to engage in everyday activities with enhanced independence.