Specifications
| Parameter | Specification |
|---|---|
| Material | AISI 316L (ASTM F138 / A276); 17-4PH (ASTM A564) for hardened cutting rims |
| Process | Silica sol lost wax investment casting + CNC milling of the tang and grinding of the cutting rim |
| Tolerance | ISO 8062 CT5 as cast, ISO 2768-f on ground features; bowl depth +/-0.08 mm |
| Surface finish | Ra 0.4 um electropolished bowl, Ra 1.6 um on the tang, matte optional to reduce glare |
| Weight range | 6 g to 45 g per blade depending on spoon size and shaft length |
| Heat treatment | Solution anneal for 316L; H900 age hardening for 17-4PH cutting versions |
| Inspection | Optical comparator rim radius, CMM bowl depth, edge sharpness gauge, 100% visual under 10x |
Key features
- Hollow spoon bowl cast net shape with uniform wall thickness, giving consistent scoop volume and predictable cutting feel.
- Cutting rim ground and honed after heat treatment to a defined edge radius so sharpness is repeatable blade to blade.
- Tang geometry machined to match the customer handle interface, whether threaded, taper fit or welded.
- Electropolished bowl surface reduces tissue adhesion and simplifies cleaning in the sterile processing department.
- Glare-reducing matte finish available on the shaft for endoscopic and microscope-assisted procedures.
- Size range from 2 mm to 10 mm spoon widths produced from one family tooling set with insert changes.
- Batch-level edge and dimension data recorded, so a re-order reproduces the approved sample geometry.
Applications
- Orthopedic bone curette blades for spinal and joint procedures.
- Periodontal and oral surgery curette spoons.
- Bone graft harvesting curettes for dental implant site preparation.
- Disc and cartilage removal curettes for spinal instrument sets.
- Veterinary orthopedic curettes in small batch runs.
- Replacement blades for reusable curette handle systems.
Quality & compliance
Ningbo Ruican is not an ISO 13485 registered contract manufacturer; we operate as a casting and machining supplier under the customer’s Quality Agreement and supply project-level ISO 13485 documentation (material certification, heat lot records, inspection reports, process control records) for each release. Typical material routes are 17-4PH H900/H1025, AISI 420 and AISI 316L, with biological evaluation data available against ISO 10993-5 for cytotoxicity when the customer specifies the test protocol.
FAQ
Q1. Which material is standard for a bone curette blade?
AISI 316L to ASTM F138 is the common choice for reusable curettes because of corrosion resistance. Where a hardened cutting edge is specified, we offer 17-4PH H900.
Q2. How sharp is the delivered cutting rim?
We grind and hone to the edge radius called out on the drawing and verify with an edge sharpness gauge plus 100% visual inspection under 10x magnification.
Q3. Can you machine the tang to our handle interface?
Yes. Threaded, taper and weld-prepared tangs are machined from the casting, then fit checked against your handle sample or drawing before release.
Q4. Do you offer both bright and non-glare finishes?
Both. The bowl is normally electropolished to Ra 0.4 um, while the shaft can be blasted matte to reduce reflected light under a surgical microscope.
Q5. How do you keep bowl volume consistent across a batch?
Bowl depth and rim radius are measured by CMM and optical comparator on a sampling plan agreed in the Quality Agreement, with the casting gating designed to avoid distortion of the thin spoon wall.
Q6. What is the minimum order for a new curette size?
Tooling and sampling quantities are confirmed after drawing review; we routinely handle small pilot batches before scaling to production releases.
