3D Printing Used to Treat Seriously Burned Children

A deep partial or full-thickness burn contracts as it heals. On a child's face, neck, or hand, that contraction can pull the mouth, eyelid, or finger out of position within weeks. Off-the-shelf compression garments are knitted from flat patterns and cannot follow an irregular graft boundary or a jawline that is still changing shape.

This is the gap 3D printing used to treat seriously burned children fills. A structured light or CT scan captures the surface, the file is mirrored and thickened in CAD, and the printer builds a shell that matches that one patient on that one day. Nothing is shared between cases.

The geometry problem is solved quickly. The materials and process problem is not. A printed mask sits on healing tissue for 20 hours a day, gets washed in disinfectant, and must hold compression of roughly 15–25 mmHg without creeping. Those constraints, not the shape, decide which process you pick.

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  Irregular contoursGraft seams and scar ridges are hard to fit with flat-pattern garments
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  GrowthChildren need a new scan and a new shell every few months
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  Short runsOne to a few hundred parts per year, not thousands

The chain starts with capture. Handheld structured light scanners resolve 0.1–0.2 mm on a still patient; a child who cannot hold still is often scanned under light sedation. CT or MRI data is used when the bone or cartilage interface matters, for example an ear or nose conformer.

Next comes CAD. The engineer offsets the scanned surface by the planned compression, adds vent windows, and thickens the wall to 2–3 mm so the shell does not flex under a strap. Mirroring the healthy side is common on facial cases. This stage is where most of the engineering hours sit, not in printing.

Printing follows. SLA or DLP resin gives the smoothest surface and the tightest fit for facial masks. SLS nylon is tougher and better for hand and neck splints that take impact. FDM is rarely the right answer here: layer lines trap bacteria and the surface is hard to clean.

Post-processing decides whether the device survives clinical use. Resin parts are washed, post-cured, and often given a silver-ion or plasma coating. Nylon parts are dyed and sealed. Every device is then checked against the digital model before it leaves the shop.

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  Wall thickness2–3 mm is typical for a facial mask before it distorts under strap load
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  CompressionOffset by 1–3 mm from the scanned surface, tuned by the clinician
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  Vent windowsLaser-cut or printed in, to keep the skin dry and visible

Printed shells are the visible half of the device. The other half is the hardware that holds them in place, and that hardware is usually machined. A mask tensioner needs a repeatable spring rate. A splint hinge needs to survive thousands of open-close cycles. A surgical guide needs a stainless bushing that will not ovalize when the drill spins.

We machine these parts in 316L stainless, Ti-6Al-4V, PEEK, and acetal. A printed mask and a machined titanium bracket are often shipped as one kit, because the two processes solve different halves of the same problem.

One example is the adjustable strap anchor on a pediatric neck conformer. The printed shell is replaced every few months as the child grows, but the anchor and its screw threads are reused. Those threads are cut on a mill-turn center to a Class 2 fit so the same screw works for the life of the treatment.

Tolerance on these small parts matters more than on the shell. A 0.05 mm mismatch on a hinge pin is a rattle. At ±0.005 mm, we hold the pin and the bore so the joint moves the way the therapist intended on the first assembly.

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  Materials316L, Ti-6Al-4V, PEEK, acetal, 6061-T6 aluminium
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  FinishesBead blasting, electropolishing, anodizing, laser marking at 1.5 mm character height
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  VolumeNo MOQ. One prototype or a 10,000-part run

Printing is not always the answer, and saying so early saves a project. If a device must be steam-autoclaved at 134 °C, most photopolymer resins soften or yellow. Move the part to PEEK, PEI, or stainless and machine it.

If the device carries structural load, for example a halo-style neck brace or a hand therapy rig with a lever, printed resin will creep under sustained stress. Machined aluminium or titanium is the correct call.

If the hospital wants an off-the-shelf size that already fits 60% of patients, a printed custom part adds cost and paperwork for no clinical gain. Custom geometry earns its place when standard sizes fail.

There is also a regulatory layer. A patient-specific device made under the treating clinician's own specification is handled differently from a device placed on the market. ISO 13485:2016 gives the process framework for the parts we make, but the clinician's prescription defines the design input.

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  Autoclave134 °C steam rules out most resins, favors PEEK or stainless
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  Sustained loadResin creeps. Use machined metal or PEEK
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  Standard sizesIf a stock size fits, do not print a custom one

Send a 3D scan, an STL, a STEP file, or a hand sketch with critical dimensions. We return a quotation and a free DFM analysis within 12 hours. Production can start within 24 hours of approval, and parts ship in 3–5 days.

For patient-specific work, the useful inputs are the scan file, the target compression, the body site, and how the device will be cleaned. That last one changes the material choice more often than people expect.

We run 127 high-precision CNC machines across three plants in Dongguan and Singapore, including 16 simultaneous 5-axis centers. Machining up to 4,000 mm is available, though burn-care hardware is usually small. Everything is inspected before shipment, and reports are available on request.

Uploads are confidential. An NDA is available on request, and files are not shared outside the project team.

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  Quote turnaround12 hours, including free DFM analysis
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  First article100% inspection with dimensional report on request
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  ConfidentialityNDA available, secure file handling