1. Core Advantages
The four engineering truths behind carbon fiber in orthotic frames
Truth 1 - Lightweight is a design requirement, not a luxury. Exoskeleton links are chosen in carbon fiber for its strength-to-weight ratio - published upper-limb exoskeleton designs select it for exactly this reason. At ~1.6 g/cm³ (roughly 1/4 of steel, 2/3 of aluminum), the frame adds less worn mass to the patient or worker, which lowers the effort the assist system must overcome. A complete commercial upper-limb exo with carbon components can weigh ~2.1 kg including actuators and strapping.
Truth 2 - Stiffness is directional, so the frame can be thin where it doesn't need bulk. Carbon composite stiffness is engineered by layup, not by cross-section. Load-carrying shells of ~1 mm (≈8 unidirectional plies) provide the structural stiffness needed to transmit forces along the limb - thick, heavy walls are simply not required. Alignment-critical parts (back support uprights, upper-arm shells) get 0° fiber where bending stiffness matters, ±45° where torsion does.
Truth 3 - Fatigue life matches daily rehabilitation use. Orthoses and exoskeletons cycle with every step and every repetition - published commercial exoskeletons using carbon composite parts specify service life beyond 2 million cycles. Carbon's fatigue behavior under repeated loading is a documented reason for its use in these devices, and every batch we ship has process records that support consistent properties.
Truth 4 - Imaging compatibility and clean, corrosion-free surfaces. Carbon fiber is radiolucent (X-ray transparent), which keeps imaging workflows unobstructed where metal frames would cast artifacts. The surface is non-corroding, and the component can be finished matte or glossy with cleanable, abrasion-resistant coatings suitable for medical device hygiene protocols.
Truth 5 - Anatomic 3D shapes, made as one part. Frames for the back, shoulder and arm are compound-curved shells - exactly what composite molding does well: variable thickness where loads concentrate, integrated attachment points, and no welds or fasteners to loosen.
At a glance - typical orthotic frame materials (relative, indicative):
| Property direction | Carbon composite | Aluminum alloy | Steel | Nylon / thermoplastic |
|---|---|---|---|---|
| Strength-to-weight | ★★★★★ | ★★★ | ★★ | ★ |
| Stiffness-to-weight | ★★★★★ | ★★★ | ★★ | ★ |
| Fatigue (cyclic) | ★★★★★ | ★★ | ★★★★ | ★★ |
| Radiolucency (imaging) | ★★★★★ | ★★ | ★ | ★★★ |
| Complex 3D forming | ★★★★★ | ★★★ | ★★ | ★★★★ |
2. Parameter Table (Capability & Spec Range - Confirm Against Your Drawing)
Geometry
| Parameter | Capability Range | Note |
|---|---|---|
| Max. part envelope | Up to [1200 × 600] mm | Flat or 3D shell |
| Min. wall thickness | 0.5–1.0 mm (shell) | Thicker at load paths |
| Variable thickness | Yes | By ply scheduling |
| Dimensional tolerance | ±0.1 mm typical; [±0.05] mm precision | Critical fit surfaces ground |
| Radius / draft | Per mold design | Under-cut review at DFM |
Material & layup
| Parameter | Standard | Options |
|---|---|---|
| Fiber | 3K / UD T700-class prepreg | T800, high-modulus, glass hybrid |
| Resin | Epoxy (low-void) | High-temperature, flame-retardant |
| Layup | 0°/±45°/90° per FEA | Ply-by-ply documented |
| Density | ~1.6 g/cm³ | - |
| Axial CTE | ≈ 0.5×10⁻⁶/°C | Near-zero, stable geometry |
Manufacturing & QC
| Parameter | Standard | Note |
|---|---|---|
| Process | Roll-wrapping / lamination + autoclave curing | In-house |
| Surface | Matte or glossy, painted/coated | Cleanable, abrasion-resistant |
| Inspection | Dimensional report + [CMM] sampling | Per batch |
| Marking | Logo, part number, lot number | Laser or silkscreen |
| Documentation | Material certs, batch records | [ISO 9001 / ISO 13485] per your requirement |
Values are typical industry figures; final values are locked from your drawing, FEA inputs and pre-production sample.
3. Customization Services - Three Entry Points, One Outcome
You have a 3D model (STEP/STL/IGES) - we run the ply/layup engineering, draft a DFM review (undercuts, radii, wall transitions), and return a manufacturability report before you spend on tooling.
You have a physical sample - we digitize it (scan or CMM), reverse the surface into a producible model, and quote tooling + part cost with a documented as-built comparison.
You have only a drawing or a spec - our engineers propose the shell design, load-path layout, layup schedule and attachment points, then iterate with you to a frozen model.
What we handle end-to-end: mold/tooling, material selection with documentation, prototype in small batches, dimensional and layup verification, serial production with batch records, and NDA-protected IP handling throughout.
4. Company Advantages
Every capability mapped to what it means for a medical device OEM:
| Our capability | What it means for your project |
|---|---|
| In-house molding + autoclave curing | One process owner from tooling to finished shell - fewer interfaces to audit |
| Documented layup and batch records | Material traceability you can reference in your design history file (DHF) |
| CMM/dimensional inspection + retained samples | Reproducibility data across batches, not just first article |
| DFM and FEA-support engineering | Layup and geometry decisions reviewed before tooling - fewer design loops |
| NDA + IP protection | Your device architecture and part files stay yours |
| Export experience in [markets 需补充] | Established logistics and documentation practice for overseas OEMs |
What we will not claim - the part of trust that matters most in medical work: we do not promise clinical outcomes, we do not fabricate certificates, and we do not certify your device. Biocompatibility of skin-contact surfaces (per ISO 10993), sterilization validation and regulatory registration are your responsibility as the device maker; we support them with material data and process documentation, and we will flag what we cannot support.
5. FAQ
Before you spec
Can you make patient-specific (bespoke) frames? Yes - from scans or cast models; the workflow is the same as above with scan data as the entry point. Cost per unit scales with customization level; talk to us for a realistic range.
What is the minimum wall you can mold reliably? 0.5–1.0 mm for shells, depending on fiber/resin system and part size; we recommend thicker sections at load paths and fastener zones.
Do you provide material selection advice? Yes - fiber grade, resin, layup and surface per your load case and environment, with documentation.
During development
What documents do you deliver with prototypes? Dimensional report, layup/build record, and material certificates; additional items (e.g., FEA correlation notes) on request.
How do you protect our design? NDA before data exchange; part files, mold geometry and tooling stay under your IP.
After production
What is the lead time? Prototype: [2–3] weeks after drawing/model freeze. Production: [2–5] weeks, depending on quantity and layup complexity.
Are parts consistent across batches? Yes - frozen process settings, documented layup, CMM sampling and retained samples per batch; deviations are reported, not hidden.
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