Medical device tray packaging in India: what buyers should ask a supplier

What does a medical device tray actually have to do?

Three things, in this order: retain the device in a known position through the whole distribution chain, present it so a gloved hand can lift it out without compromising sterility, and go through your sealing line and sterilisation route without warping, cracking or shedding.

Most people specify the first and forget the other two, which is how you end up with a tray that photographs beautifully and fails at the customer.

Retention is not just a snug pocket. A device that can rattle can abrade its own coating, damage a cutting edge or wear through the lidding from the inside. A device held too tightly is worse: the clinician has to fight it out of the cavity, which is precisely when sterility gets compromised. The right answer is usually a small number of well-placed contact points and controlled clearance elsewhere, not a full-body impression of the device.

Presentation is a design discipline in its own right. The device has to be liftable in one movement, in the orientation the procedure needs, by someone whose fingers are gloved and whose attention is on the patient. Finger-relief scallops, a raised end, a defined pick-up point — these are cheap on a formed tray and they are the difference between a pack that works in theatre and one that does not.

Survival is about the flange, mostly. The seal happens on the flange, so the flange has to be flat, dimensionally consistent and free of forming defects. It has to stay flat through the thermal cycle of sealing, and the tray has to hold shape through whatever sterilisation route you use. Trays that pass at the converter and fail at the sealer nearly always fail on flange flatness.

What is a sterile barrier system, and where does the tray sit in it?

A sterile barrier system is the minimum package that prevents microbial ingress and allows aseptic presentation of the device at the point of use. A formed tray is normally one half of it, with a lidding material sealed to the tray flange forming the other half.

The vocabulary is worth learning properly because it is the vocabulary your auditor and your notified body will use.

Why this matters commercially: the requirements that attach to a preformed sterile barrier system are materially heavier than those attaching to protective packaging. If your formed tray is a presentation and protection component sitting inside a pouch that is the real barrier, the qualification burden on the converter is different — and cheaper — than if the tray itself is the barrier. Know which one you are buying before you write the specification, and tell the converter, because it changes what they should be quoting for.

What does ISO 11607 require, and does my supplier need it?

ISO 11607 is the international standard for packaging of terminally sterilised medical devices. Part 1 sets requirements for materials, sterile barrier systems and packaging systems, including design, performance and stability. Part 2 sets validation requirements for the forming, sealing and assembly processes that make and close the pack.

The standard is addressed to the organisation responsible for the packaging system — normally the device manufacturer. It is not a certification a thermoformer holds like a badge. What it does is create a set of obligations that flow down to suppliers through your own qualification process.

To be explicit about our own position: Eagle Thermo Packaging does not claim to hold ISO 11607 or ISO 13485. What we do is form to the specification you validate, keep the process consistent and documented, and support your qualification with the evidence and the access you need. Where a device requires a supplier holding a formal quality system certificate, you should say so at enquiry stage and we will tell you plainly whether we are the right supplier for that programme.

Verify the current edition and any amendments of ISO 11607 against the standards body before writing it into a specification. The standard has been revised and amended, and the version referenced in your technical file should be the one in force.

Which material should a device tray be made from?

Among the four sheets we form, A-PET is the workhorse for sealed device trays and HIPS is the answer where visibility is not needed. The deciding constraint is almost always the sterilisation route and the lidding pairing, not the tray in isolation.

Two honest caveats. First, we form A-PET, rPET, PVC and HIPS, and only those. We do not form PETG or PP. A good deal of the medical tray market elsewhere uses PETG for its sealing behaviour and deep-draw tolerance, and if your validated specification calls for PETG we are not your supplier for that part. We would rather tell you at enquiry than at first article.

Second, sterilisation route drives material choice more than anything else on this page. Radiation, ethylene oxide and steam impose completely different demands, and the lidding has to match: a gas route needs a porous lid, a radiation route does not. Settle the sterilisation method and the lidding first, then choose the tray material, then tool. Doing it in the other order is how projects get retooled. Full detail on how the four sheets behave generally is in A-PET vs rPET vs PVC vs HIPS.

Why does the forming environment matter, and what should you ask about it?

Because particulate, fibre and cross-contamination introduced at forming travel all the way to the point of use, and because bioburden going into sterilisation is your problem, not the converter's. Ask specific questions and accept only specific answers.

Here is our own position, stated as plainly as we can. Eagle Thermo Packaging operates a controlled forming room. It is not a formally ISO-classified cleanroom and we do not hold a classification for it. What the room actually has is:

• Filtered air supply to the forming and packing area.
• A gowning protocol for anyone entering, applied to staff and visitors alike.
• Restricted entry — it is not a through-route and it is not general factory floor.
• Segregated material handling, so medical sheet and medical work in progress do not share space or handling with general industrial work.
• Batch traceability from incoming sheet lot through forming to dispatch.

That is a genuine and useful level of control. It is not the same thing as a certified environment with monitored particle counts against an ISO class, and we will not let a buyer walk away thinking it is. Anyone in this industry who answers the cleanroom question with a shrug and a yes is a supplier you should worry about, because the same instinct will apply to the next question you ask.

What you should ask any converter, ours included:

1. Is the forming area classified? If so, to what class, monitored how often, certified by whom, and can I see the last report?
2. If it is not classified, what controls exist instead, and how are they evidenced?
3. Who can enter the area, and what is the gowning procedure?
4. Is my material handled separately from general production, and at what point does segregation start?
5. How are formed parts packed, and in what — bag type, liner, box?
6. Where is finished stock stored and how is it protected before dispatch?
7. Have medical device customers audited this facility, and will you share the scope and outcome?

On the last one: Healthium and Auxein, both medical device companies, have audited and approved our plant. So have IKEA, Pigeon and Minda Corp for their own product categories. An audit by a device customer is not a certificate and does not substitute for one, but it does mean a knowledgeable third party has walked the floor, asked the awkward questions and signed us on. That is a real data point and it is one you can ask us to talk about.

What does batch traceability actually mean in practice?

That any tray you hold can be traced back to the sheet lot it was formed from, the tool it was formed on, the date and shift it ran, and the dispatch it left in — and that the same trail can be followed forwards from a suspect sheet lot to every customer who received parts made from it.

Traceability is only worth having if it works in both directions. Backward traceability answers the question you ask during an investigation: what was this made from. Forward traceability answers the question you ask during a recall: where did it all go. Most suppliers can do the first. Fewer can do the second quickly, and speed is exactly what matters when a recall decision is live.

What to look for in a converter's system:

• Incoming sheet is recorded by lot against supplier and delivery, not just by material name.
• The lot number follows the work through forming and punching rather than being reconstructed afterwards.
• Dispatch records reference the lot, so your goods-in paperwork carries it too.
• Tooling is identified, so a defect traced to a particular cavity can be isolated rather than condemning a whole run.
• Retention samples are kept, so there is a physical reference to compare a complaint against.
• Someone can demonstrate it on the spot — the real test of a traceability system is whether a person on the floor can run a query while you stand there, not whether a procedure exists in a binder.

Ask for that live demonstration at audit. Pick a tray from finished stock and ask which sheet lot it came from. The answer, and how long it takes, tells you more than the quality manual will.

What validation and sampling should you expect?

Expect the converter to prove the geometry before tooling, to submit a documented first article you formally approve, to hold the process settings that produced it, and to notify you before changing anything that could affect the part. Expect the packaging system validation itself to sit with you.

The division of labour is worth stating clearly, because ambiguity here causes disputes later:

Our sequence for a device tray is deliberately front-loaded. We cut a wooden trial mould first, form samples on it, and put your actual device into them so you can judge retention and pick-up by hand. Only once that is right do we cut the aluminium production tool in-house. It costs a few days and it saves the far more expensive mistake of validating around a cavity that turns out to be wrong. The general design rules behind that are in designing for thermoforming, and the production sequence itself is in how a thermoformed tray is made.

On change control, be specific in your purchase agreement. The changes that matter are material grade or supplier, sheet gauge, tooling modification, and forming location. Require written notification and your approval before any of them. A converter who resists that clause is telling you something.

What questions should you put to an Indian converter?

The ones whose answers cannot be improvised. Ask about environment, material provenance, traceability, tooling ownership, change control, capacity and audit history — and note not just the answer but how quickly and specifically it comes.

1. What exactly is your forming environment, and what evidence backs that description?
2. Which materials do you form, and which do you not? A supplier who says they can form anything is either very large or not being straight with you.
3. Where does your sheet come from, and can you show me the lot documentation?
4. Show me traceability on a part from finished stock, now.
5. Who owns the tool, where is it stored, and what happens to it if we stop trading?
6. What is your change-control process and who signs it off?
7. What is your monthly capacity, and what proportion of it is committed?
8. Which device customers have audited you, and what was the outcome?
9. What is your maximum forming area and draw depth? Ours is 600 × 600 mm and up to 75 mm draw, on 200 to 2000 micron sheet. A converter who does not know their own envelope by heart is not going to be precise about anything else.
10. Who will I actually speak to when something goes wrong?

That last question is underrated. Device packaging problems are urgent when they happen. Knowing there is a named person who answers the phone is worth more than a paragraph in a brochure.

Frequently asked questions