Precision Micro-Cutting for Implants & Stents
Medical implant manufacturing requires feature sizes that no mechanical process can achieve. Laser micro-cutting creates stent struts as narrow as 60μm, catheter slots at 50μm width, and implant features with positional accuracy of ±5μm — all on materials designed to survive decades inside the human body.
Quick Answer
Stent cutting uses pulsed fiber lasers (50–200W, ns/ps pulse) or ultrashort-pulse (USP) femtosecond lasers for the finest features. Tube diameters range from 1.5–10mm with wall thickness of 0.08–0.3mm. Kerf width: 20–50μm (USP) or 80–150μm (ns fiber). After cutting, parts undergo electropolishing to remove the recast layer and achieve Ra < 0.2μm surface finish.
Laser Types for Medical Micro-Cutting
| Laser Type | Pulse Width | Kerf Width | HAZ | Best Application |
|---|---|---|---|---|
| Pulsed fiber (ns) | 10–200 ns | 80–150μm | 10–50μm | Standard stents, instruments |
| Picosecond | 1–50 ps | 30–80μm | 2–10μm | Fine stents, drug-eluting |
| Femtosecond | 100–500 fs | 20–50μm | <2μm | Ultra-fine features, polymers |
| CW fiber (low power) | Continuous | 100–200μm | 30–100μm | Larger implants, instruments |
Material-Specific Parameters
| Material | Wall Thick. | Avg Power | Pulse Energy | Speed | Gas |
|---|---|---|---|---|---|
| 316LVM SS | 0.10mm | 30–60W | 0.3–0.8 mJ | 5–15 mm/s | O₂ or Ar |
| Nitinol (NiTi) | 0.15mm | 50–100W | 0.5–1.5 mJ | 3–10 mm/s | Ar (mandatory) |
| L-605 CoCr | 0.08mm | 20–50W | 0.2–0.6 mJ | 3–8 mm/s | O₂ or Ar |
| Ti-6Al-4V ELI | 0.20mm | 40–80W | 0.4–1.0 mJ | 2–8 mm/s | Ar (mandatory) |
Quality Inspection for Micro-Cut Parts
Dimensional Inspection
- • Optical measurement at 50–200×: strut width, gap width
- • μCT scanning for 3D geometry verification
- • Profile projector for tube concentricity
- • Auto-measurement software with statistical output
- • Cpk > 1.33 required, Cpk > 2.0 preferred
Surface / Edge Inspection
- • SEM at 500–5000× for edge quality assessment
- • White-light interferometry for Ra measurement
- • Cross-section metallography for HAZ/recast
- • XPS/EDX for surface chemistry verification
- • Dye penetrant for crack detection on critical parts
Related Topics
Disclaimer: Medical device manufacturing parameters require formal validation per FDA QMSR (incorporating ISO 13485:2016) requirements. These are reference starting points only.