UDI-compliant laser marking of medical devices

Software and marking laser from a single source
The UDI – often applied in the form of a linear bar code or 2D DataMatrix code – combines static and dynamic identifiers. The static portion is a unique, dedicated code for the specific medical device, while the dynamic portion changes for each batch of products. There are currently three accredited UDI labeling standards: GS1, HIBC and ISBT 128. Based on its TruTops Mark marking software, TRUMPF has now developed a special module to create standard-compliant UDIs from company and production data and mark them on medical devices. Users can use whichever of the three identification systems they choose to present their data in UDI format. The whole process also functions in reverse, with the optional VisionLine Mark image processing module enabling the TRUMPF software to quickly scan and read UDIs on medical devices.

So how exactly do companies affix UDIs to their medical devices? Marking lasers have become well-established among medical device manufacturers as a tried and tested approach. Thanks to its broad product range, TRUMPF can offer the right laser for any kind of material, from stainless steel and aluminum to plastics and organic materials. The new TruMicro Mark 2000 is a particularly good choice for the medical device sector. It offers an ultra-short pulsed laser with extremely short 0.4- to 20-picosecond laser pulses and high pulse energies of up to 20 microjoules. What’s more, it produces completely corrosion-resistant marks that maintain their high contrast appearance even in the face of repeated cleaning and sterilization – and that’s a definite plus, especially when it comes to medical devices.

So how does it work? The pulses emitted by the TruMicro Mark 2000 are short enough to enable cold material processing. In other words, the time taken to absorb the laser energy is shorter than the time required to heat up the surrounding material, so the machining of the material is completed before thermal processes can take effect. To mark the medical device, the high pulse peak powers of the TruMicro Mark 2000 initially produce a nanostructure on the device’s surface. This rough surface then creates a kind of light trap that significantly reduces the diffuse scattering of the light, causing the mark to take on a permanent dark black hue. Perhaps the biggest advantage of this method is that it allows the protective chromium oxide layer of the steel to re-form after processing, preventing the onset of corrosion.