Ultrashort Pulse Laser Enables Durable Medical Marking

With increasing regulatory demands such as UDI under FDA and EU MDR frameworks, ultrashort pulse laser black marking is emerging as a reliable solution for durable, high-contrast marking on medical-grade metals.

Context: Regulatory and technical challenges
Medical device manufacturers must ensure permanent, legible identification on components such as surgical instruments and implants. However, marking stainless steel surfaces presents multiple challenges, including high reflectivity, limited marking space, and strict requirements for material integrity.

Repeated cleaning, sterilisation, and passivation processes further increase the need for durable, corrosion-resistant markings.

Technology: Black marking with ultrashort pulse lasers
Black marking uses ultrashort pulse (USP) lasers to create nanostructures on the material surface rather than relying on heat or material removal.

These nanostructures act as “light traps,” producing deep black, non-reflective markings that remain consistent regardless of viewing angle or lighting conditions. The process is often described as “cold marking” due to minimal thermal impact on the surrounding material.

Performance: High contrast and durability
The technology delivers high-contrast, reflection-free markings suitable for machine-readable codes such as DataMatrix used in UDI systems.

Testing has demonstrated that markings remain legible even after extensive reprocessing cycles, including cleaning and sterilisation, ensuring long-term reliability throughout the product lifecycle.

Application examples: Precision and reliability
In surgical instruments, black marking enables durable UDI codes on polished stainless steel surfaces without affecting corrosion resistance or material properties.

For dental implants and other miniaturised components, the technology supports high-precision marking in very small areas while maintaining readability. Integration with vision systems enables accurate positioning and inspection during production.

Process considerations: Ensuring quality and compliance
Successful implementation requires careful optimisation of laser parameters such as pulse energy, duration, and focal position. Material properties and surface conditions must also be considered.

A holistic workflow combining marking, inspection, and documentation is essential for regulatory compliance. Inline vision systems and data logging support traceability and audit readiness.

Operational impact: Improved reliability and reduced risk
By eliminating thermal damage and ensuring consistent readability, black marking reduces the risk of marking failure and product recalls. It also supports efficient inspection processes and long-term product identification.

Conclusion: Enabling compliant and durable marking
Ultrashort pulse laser black marking provides a robust solution for medical device identification, addressing key challenges in reflectivity, durability, and regulatory compliance. When combined with integrated workflows, the technology supports reliable, long-term marking performance in demanding medical applications.

Edited by an industrial journalist, Lekshman Ramdas, with AI assistance.

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