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.

Micro-Cutting Validation Path

This is a manufacturing process page, not a clinical performance claim. Use it to qualify feature geometry, recast removal, surface finish, inspection capability, and QMSR records for implant and stent production.

1. Convert device geometry into process limits

Define tube diameter, wall thickness, strut width, minimum radius, kerf allowance, and allowable positional drift. Use the kerf calculator to compare expected kerf against minimum feature size.

2. Choose pulse regime by recast and HAZ tolerance

Nanosecond fiber lasers can be productive, while ps/fs lasers reduce thermal damage for very fine features. Validate HAZ and recast against the surface finish validation path and edge roughness measurement guide.

3. Build inspection capability before PQ

Confirm optical measurement, SEM, white-light interferometry, μCT, or fixture methods can resolve the tolerance band with acceptable gauge R&R. Link measurements to the FDA QMSR validation workflow.

4. Control safety and contamination at the cell level

Micro-cutting cells need validated fume extraction, fixture cleaning, gas purity, operator access control, and laser classification review. Check the laser safety checker before final equipment selection.

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