Overview

A micro surgical blade etching process shapes miniature scalpel and microsurgery blades by dissolving the blade profile and its cutting bevel from hardened stainless steel, rather than grinding or stamping it. Martensitic grades 420 and 440A, plus 316L for corrosion-critical tools, 0.10–0.50 mm thick, are laminated with dry-film resist, exposed and developed, then etched in a matched ferric-chloride chemistry that forms a continuous, burr-free edge with no grind burr, no recast layer and no heat tint. Because the bevel is produced by a timed, dual-side etch, the edge angle is set by artwork and etch depth rather than by an abrasive wheel.

For a surgical edge, cleanliness is the whole specification, and micro surgical blade etching delivers an edge that is chemically clean and metallurgically unchanged right up to the tip. Side etch is compensated at roughly 0.6–0.8 × thickness per side so a 0.15 mm blade keeps a ±0.01 mm profile, and electropolishing after stripping removes any microscopic peak without rounding the apex. The parts are passivated, ultrasonically cleaned and packed in clean trays, and the whole batch shares one film, so edge geometry repeats from the first sample to the ten-thousandth blade without wheel wear.

Parameter Window

• Available Materials: martensitic stainless 420/440A/440C, 316L, 17-4PH on request
• Material Thickness Range: 0.10–0.50 mm (0.15–0.30 mm typical for micro blades)
• Tolerance: profile ±0.01 mm, edge radius ≤ 0.005 mm, bevel angle ±1.5°
• Minimum Feature: 0.10 mm tip width, 0.15 mm slot, bevel width 0.2–0.6 mm
• Surface Options: electropolished, passivated, mirror finish, PVD/TiN coating, sterile clean packaging
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork & Etch Compensation — Draw the blade outline and bevel lands, shrinking the profile by the measured side-etch factor of about 0.6–0.8 × thickness per side.
2. Material Selection — Choose 420/440A for hardness after heat treat or 316L for maximum corrosion resistance, and verify flatness and inclusion level.
3. Cleaning & Lamination — Degrease and laminate dry-film resist on both faces so the fine tip and bevel lands are fully covered.
4. Dual-Side UV Exposure — Expose top and bottom artwork in registration so the bevel forms symmetrically about the blade centreline.
5. Development — Wash out unexposed resist to open the outline and bevel areas, then inspect the tip under magnification for scumming.
6. Etching — Spray ferric chloride to cut the profile while a controlled dwell forms the bevel, then rinse before the apex over-etches.
7. Stripping & Electropolishing — Strip resist, neutralize, then electropolish and passivate to a mirror finish and ultrasonically clean the edge.
8. Inspection & Packaging — Verify profile, edge radius and bevel angle optically, check burr-free edges, then pack in clean single-part trays.

Core Advantages

1. Chemically clean edge: Dissolving the metal leaves no grind burr, recast layer or abrasive embedment at the cutting line.
2. Unchanged edge metallurgy: No heat-affected zone means hardness and corrosion resistance hold right to the apex.
3. Symmetric dual-side bevel: Exposing and etching both faces together centers the apex and keeps the edge angle within ±1.5°.
4. Sharp, repeatable apex: A ≤ 0.005 mm edge radius is held by timed etch and electropolish rather than wheel dressing.
5. Burr-free at small size: 0.10 mm tips and micro slots stay clean where grinding or stamping would roll a burr.
6. Repeatable edge geometry: micro surgical blade etching runs one artwork across the whole sheet, so tip angle and edge radius do not drift as a grinding wheel wears.

Typical Applications

• Microsurgery scalpels: 420 blades for ophthalmic and neuro procedures with a clean, atraumatic edge.
• Dermatome and biopsy blades: Thin 440A edges that cut a uniform section without tearing tissue.
• Laparoscopic and catheter tips: Miniature 316L cutting features integrated into tube-end components.
• Dental and endodontic instruments: Fine profiles with tight tip radius for delicate work.
• Lab and histotome blades: Disposable precision edges for microtomes and sample preparation.
• Veterinary and research tools: Custom small-batch blades where a new profile must be sampled quickly.

Design Notes & Process Considerations

1. Bevel geometry: State the included angle and bevel width, since the apex is set by etch depth and dual-side registration.
2. Heat-treat sequence: Confirm whether the blank is etched before or after hardening, as hardness affects etch rate and flatness.
3. Edge radius: Call out a maximum edge radius and the inspection method, so electropolishing does not round the apex.
4. Cleanliness and burr: Require burr-free, particle-free edges and passivation, and specify the clean-pack class.
5. Tip protection: Add a handling tab or carrier frame, since a 0.10 mm tip bends easily before assembly.
6. Lot traceability: micro surgical blade etching should ship with melt-lot and hardness records, so every blade is traceable to its material heat.