What gets marked on medical equipment
Equipment makers mark model and serial numbers, rating details, port and connector legends on rear panels, button legends on keypads and graphical symbols, many of them drawn from ISO 15223-1 and IEC 60417. Reusable accessories such as laryngoscope handles, stethoscope chest pieces, blood pressure cuff connectors, instrument trays and the frames of trolleys and stands carry part numbers and often a 2D code. Hospital biomedical departments also add their own asset numbers so each monitor or infusion pump can be tracked through service records.
The reason to use a laser instead of a printed label is wear. Hospital equipment is wiped down many times a day with alcohol and disinfectants, and labels lift at the edges while pad printed legends rub off. A laser mark is part of the surface. Where a device is meant to be used more than once and reprocessed between uses, the US FDA UDI rule generally expects the UDI to be marked on the device itself, so exporters plan for laser marking on medical equipment early.
Which laser marking machine suits medical equipment
Housings are mostly ABS, PC, PC/ABS blends and PP, with polysulfone or PPSU used for parts that go into an autoclave. A fiber laser gives good contrast on many coloured ABS and PC grades, especially when the moulder has added a laser marking additive. White and light grey housings, PP parts and silicone keypads often mark better with a UV laser, which works as a cold process and avoids the yellow or burnt look a fiber laser can leave on pale plastics. The plastic marking guide and the ABS page go through resin behaviour in more detail.
Metal parts follow a different path. Stainless steel handles and panels take a fiber engraving or a MOPA dark annealed mark that stands up to wiping. Anodised aluminium front panels mark bright where a fiber laser removes the dye, and a MOPA source can give darker marks on the same panels. Glass display covers and touch panels are UV work. A CO₂ laser marks paper, card and some plastics but does not mark bare metal.
Tubing and blood bags are very often made of PVC, and PVC must never be laser marked because it releases chlorine compounds that are harmful and corrode the machine. Those items are normally coded with continuous inkjet instead.
When printing or labelling is the better choice
PVC tubing and blood bags must never be lasered, and sterile pouches are usually printed rather than marked. For those items, continuous inkjet, thermal inkjet, thermal transfer overprinting or print and apply labelling are the usual choice, while the laser handles the device body.
Setting up the job
Housings are rarely flat, so the first task in laser marking on medical equipment is to hold each moulding with the marking area square to the lens and at the right height. A galvo head has a limited depth of focus, and a curved panel may need a motorised Z axis or two marking files at different heights. Rear panels with many legends are best laid out from vector artwork so the symbols sit exactly over the moulded ports. Before release, run a rub test with the disinfectants your customer's hospitals use and, for autoclavable parts, a set of sterilisation cycles. 2D codes should be checked with a verifier and with the scanners the hospital actually uses.
What to check before you buy
- Full material list. List every housing resin, colour and metal finish on the product and trial each one, since a machine that marks grey ABS well may struggle on white PP.
- Fiber or UV. If most of your housings are white or light coloured, compare fiber and UV samples side by side before deciding.
- Panel size. Measure the largest front panel. A typical galvo field of around 100 x 100 mm may need a larger lens or a second position for big panels.
- Curved surfaces. Check marking quality at the edges of curved housings, where the surface moves out of focus.
- Chemical resistance. Test marks against alcohol and the hospital disinfectants named by your customers for the number of wipes they specify.
- Code readability. Confirm UDI or asset codes read reliably on glossy and textured plastics, not just on a flat test plate.
- Plastic fumes. Plan proper fume extraction with filters suited to plastic fumes, especially on a line that marks all day.
Laser marking on medical equipment in Tamil Nadu
Chennai is one of India's largest hospital cities, and Vellore's CMC draws patients from across the country, so the state has steady demand for equipment, spares, refurbishment and service. Device makers and equipment refurbishers across Chennai's industrial estates, along with enclosure and panel suppliers in the electronics manufacturing belt around Sriperumbudur, are the typical buyers for laser marking on medical equipment. Hospital biomedical teams that want permanent asset marking are another.
NMB Enterprises is based at Poonamallee, Chennai. Buyers in Chennai, Vellore, Coimbatore or anywhere in Tamil Nadu can call or WhatsApp 098417 60722 with photos of the housing or panel, its material and colour, the text or code to be marked and the daily quantity, and NMB will recommend a fiber or UV configuration that suits the part.