Medical Device Fastening: Cleanability, Biocompatibility and Micro Hardware
A surgical instrument or infusion pump lives a fastening life defined by cleaning chemistry, repeated autoclave cycles and audit-ready documentation.
Surviving sterilization
Autoclave steam at 134 °C, plus alkaline detergents, corrodes marginal stainless mercilessly. Specify A4 (316-class) with proper passivation; avoid crevices where bioburden hides — sealing washers under heads, smooth transitions, no trapped slots. Coated carbon steel is generally out: coatings chip under instrument-service handling and shed particles.
Materials and biocompatibility
- Implant-adjacent and skin-contact hardware: ISO 10993-evaluated materials or well-known implant alloys.
- No zinc or nickel coatings on patient-contact paths — nickel release is a regulatory topic.
- Lubricants must be medical-grade; standard anti-galling compounds are contaminants.
Documentation is part of the product
Material certificates, cleaning-agent compatibility data and change-control notifications come with the hardware, not on request. Topprecision supplies medical OEMs with passivated A4 micro and standard fasteners, medical-grade documentation sets, and lot traceability sized for design-history-file audits.
