Tendon-Driven Modular Thumb Prosthesis

Design a functional, modular prosthetic thumb with mechanical attachment to the human hand. 1. Hand Attachment Secure, adjustable attachment to the remaining hand. Custom-fitted support around the palm or residual thumb area. Comfortable, lightweight and non-slip interface. Stable mechanical connection to the prosthetic thumb. 2. Mechanical Actuation Use the movement of the remaining finger(s) to mechanically operate the prosthetic thumb. Explore tendon/cable transmission or mechanical linkage. Finger flexion should produce controlled thumb movement. Finger extension should allow thumb repositioning through spring-assisted or reverse mechanical action. Adjustable movement range and mechanical tension. 3. Thumb Mechanics Multi-axis base joint enabling opposition. Articulated thumb with proximal and distal sections. Functional flexion and extension. Adjustable opposition angle. Replaceable, compliant fingertip. Ability to perform precision pinch against the index finger. 4. CAD and Manufacturing Fully parametric modular CAD assembly. Replaceable joints and mechanical components. 3D-printable construction. STEP, STL/3MF and technical drawings. Exploded assembly and BOM. Main Design Objective Create a mechanically operated thumb prosthesis that attaches directly to the hand and uses the movement of the remaining fingers as its primary power source, restoring functional opposition and pinch-grip capability without electric motors.

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