4D Splints with SLS: goodbye to plaster and discomfort

Published on May 23, 2026 | Translated from Spanish

4D printing applied to orthopedic splints promises to change the patient experience. Manufactured using selective laser sintering (SLS), these porous and lightweight structures dynamically adapt to the swelling or reduction of the limb, eliminating the annoying plaster cast changes. According to foro3d.com, their breathable design improves hygiene and facilitates medical monitoring.

Medical-grade forearm orthosis created by SLS 3D printing, porous lattice structure being dynamically compressed by a patient’s swollen wrist while a second smaller shape shows the relaxed fit after swelling subsides, hand adjusting the lightweight perforated brace next to a discarded plaster cast, translucent airflow simulation through the micro-holes, engineering visualization with cross-section view of the adaptive material layers, photorealistic technical illustration, clinical white background, soft studio lighting emphasizing texture and porosity, ultra-detailed nylon powder finish, realistic medical device render

SLS and smart materials: the evolution of orthopedic support 🦾

The technical key lies in the combination of selective laser sintering with shape memory polymers. The additive manufacturing process allows the creation of reticulated structures with controlled porosity, which not only reduce the device's weight but also allow air circulation. By applying body heat or external stimuli, the material modifies its geometry to adjust pressure on the affected area, offering precise and dynamic support throughout the recovery process.

Plaster casts retire: now the splint breathes and adapts 😎

With 4D splints, the classic plaster cast seems destined for the medical horror museum. No more will you have to endure that infernal itching that makes you dream of a back scratcher, nor the torture of trying to scratch yourself with a ruler. Of course, get ready to explain to your grandmother that your cast is now a high-tech piece that, moreover, smells better. The revolution has arrived, and it doesn't come with a scratching stick.