A programmable metamaterial finger can lock into four positions without electronics. A simpler, more functional future for prosthetic hands.
A new finger joint made from a single piece of programmable metamaterial could simplify the design of hand prostheses and robotic grippers , offering users greater comfort, aesthetics, and functionality at lower cost.
The system, developed within the Fraunhofer Cluster of Excellence Programmable Materials CPM, can hold four stable positions without motors or multiple interconnected parts, a shift away from conventional prosthetic designs that rely on screws, hinges, and extensive assembly.Researchers from several Fraunhofer Institutes are working together on the “ProFi” project. Their goal is to redesign passive hand prostheses to provide more intuitive finger control while ensuring that the device remains accessible to people who cannot afford complex electronic prosthetics.Reimagining jointed prostheticsPassive hand prostheses with jointed fingers are often preferred for their affordability and visual appeal. However, traditional mechanical fingers require multiple connected components, each increasing cost, weight, and maintenance challenges.According to a press release, the ProFi system replaces that entire architecture with a single programmable metamaterial that allows a finger to bend along one axis, and crucially, stay locked in place at multiple angles. The prototype enables movement in 30-degree increments, supporting four distinct gripping, resting, or gesturing positions.Researchers validated the structure using finite element method simulations to check how stress distributes during bending. These insights helped refine the design so the joint can withstand repeated use while maintaining stiffness in all directions except the intended bending path.Once optimized, the finger was 3D-printed as a single component using additive manufacturing techniques such as Fused Deposition Modeling and Selective Laser Sintering . This eliminates assembly and makes customization easier, features considered essential by prosthetic users who care about comfort and natural hand appearance.How multistability worksProgramming stability into a material requires controlling how the internal structure behaves when force is applied. Fraunhofer scientists achieved this by integrating bistable unit cells into the joint design. Each cell uses elastic beams that can snap from one state to another and remain there without continuous force.Researchers used ProgMatCode, a software tool built for programmable materials, to model and optimize this behavior. Combined with the specially designed joint geometry, multiple bistable cells produce a finger that can shift smoothly between locked positions without electronics or energy input.This passive multistable design also makes the finger safer, especially in applications like grasping objects in industrial automation, where simple, predictable mechanics can prevent accidents.Programmable materials come into focusThe innovation is part of a broader Programmable Materials CPM initiative effort to rethink how materials behave. Programmable metamaterials are engineered so that their structure, not their chemistry, determines their macroscopic properties. Unlike traditional materials, their internal geometry can change under external stimuli, enabling them to switch between different functional states.Such materials could eventually consolidate entire systems into a single, adaptable component, reducing weight, improving durability, and enabling previously impossible design freedom. Robotics, healthcare devices, and environmental technologies are expected to benefit most.The new finger joint provides a tangible look at that future. It is a compact, customizable mechanism that replaces multiple mechanical parts, supports realistic movement, and makes prosthetic hands more accessible and user-friendly.The team foresees further applications in orthotics and gripping tools as the research progresses, pushing programmable materials closer to everyday use. This development marks a promising leap forward in function and form for individuals relying on prosthetic hands, and for robots needing versatile yet simple manipulators.
Finger Gripper Hand Metamaterial Programmable Materials Prosthetic Prosthetic Hand Robotic Arm Robotic Grippers Robots
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