Researchers from the University of Science and Technology of China (USTC) have developed an Open-Source Prosthetic Hand that replicates human dexterity with 19 degrees of freedom (DOF). The device utilizes shape-memory alloy (SMA) actuators, which function as artificial muscles. These actuators offer a high power-to-weight ratio, allowing the prosthetic to achieve smooth and precise finger movements while maintaining a lightweight structure of only 0.37 kg.
The prosthetic incorporates a biomimetic tendon-driven transmission system, inspired by the mechanics of a human hand. This design helps distribute force efficiently and minimizes transmission resistance, leading to improved movement accuracy and fluidity. Additionally, an array of 23 sensor units is embedded across the fingers and wrist, enabling real-time feedback for better control and interaction with objects. This setup enhances fine motor skills, making the prosthetic capable of performing tasks such as grasping, writing, and handling delicate items.
For user convenience, the prosthetic is integrated with a voice recognition system that supports multiple languages and dialects. With a reported 95% accuracy rate and a millisecond response time, users can control the prosthetic through voice commands without requiring manual adjustments. This hands-free operation streamlines usability, especially for individuals with limited mobility in their other hand.
As an open-source project, all design files and technical details are available for researchers and developers to modify and improve. By combining SMA actuation, a tendon-driven system, and advanced sensor feedback, this prosthetic hand provides a functional and efficient solution for upper-limb mobility while encouraging further innovation in prosthetic development.
