Moving a medical device to a contract manufacturer (CMO) or EMS provider can free up capacity, cut cost and add capabilities you do not have in-house. It can also stall a product line for a year if the transfer is treated as a purchasing exercise. The companies that do it well run it as a cross-functional program with clear phases, owners and exit criteria.
Here is the sequence I use, and where transfers most often go wrong.
1. Define why you are moving, and what “done” looks like
Cost, capacity, capability and footprint strategy lead to different partner choices and different trade-offs. Write down the business case and the acceptance criteria up front: target cost, yield, capacity, lead time and quality levels, plus the date by which the sending site stops building. Everyone involved should be able to say what “transferred” means.
2. Select and qualify the partner
Beyond price, assess the things that decide whether the transfer will succeed:
- ISO 13485 certification and FDA registration, and recent inspection history
- Experience with your device class and your specific processes (molding, assembly, cleanroom, sterilization interfaces)
- Their own supplier controls, and whether your critical components will come through their supply chain or yours
- Engineering depth to run validation, not just production
- Capacity headroom, and how your volume compares with their larger customers
A qualification audit by Quality, with Operations and Engineering in the room, is worth the time. It is far cheaper to find gaps now than after tooling has moved.
3. Put the quality agreement and contract in place
You remain the legal manufacturer, so responsibilities have to be explicit. The quality agreement should cover complaints, CAPA, nonconformances, change control, supplier management, records and final release. The supply contract should cover forecasts, pricing, ownership of tooling and equipment, and exit terms, including how documentation and tooling come back to you if you ever move again.
4. Build a complete transfer package
Most transfer delays start here. The partner can only build what is written down, so the device master record, drawings, specifications, work instructions, inspection methods, BOMs, approved supplier lists and process validation history all need to be current. Gaps that your own team works around with tribal knowledge become nonconformances at a new site. Budget time to close them before the handoff, and plan for engineers from the sending site to support the receiving site in person.
5. Plan validation and first builds
Agree a validation master plan before equipment moves: which processes need IQ, OQ and PQ at the partner, what can be leveraged from existing data, and whose protocols and acceptance criteria apply. Follow with first-article inspection and engineering builds, then validation lots. The goal is to show that the partner’s product and process performance match what your site already demonstrated.
6. Work the regulatory path in parallel
A new manufacturing site can trigger submissions or notifications depending on the device and the market, and some of those take months. Get Regulatory involved at the start to assess each market, update registrations and listings, and plan labeling changes such as the manufacturer address and UDI records. Build the regulatory timeline into the master schedule rather than treating it as a final step.
7. Protect supply with bridge inventory
Build enough stock at the sending site to cover the validation period, regulatory approvals and a realistic buffer for surprises. Customers should never see the transfer. Running out of bridge inventory is one of the most common and most avoidable ways a transfer turns into a backorder.
8. Hand over to steady state
Transfer is complete when the partner hits the agreed acceptance criteria over a sustained period, not when the first good lot ships. Then move from the transfer team to a steady-state operating rhythm: agreed KPIs (on-time delivery, yield, complaints, cost), regular business reviews and a clear escalation path.
Where contract manufacturer transfers go wrong
- Treating it as a purchasing project. Quality, Regulatory, Engineering and Supply Chain all own part of the outcome.
- Incomplete documentation. What works at your site because “everyone knows” will not work at theirs.
- Late regulatory planning. Approvals become the critical path when no one checked early.
- Too little bridge stock. Validation always takes longer than the plan.
- Vague acceptance criteria. Without them, the transfer never formally ends and accountability blurs.
Frequently asked questions
How long does a transfer to a contract manufacturer take?
It depends on device complexity, how many processes need validation and the regulatory path. A simple assembly can move in a few months; a complex device with special processes and submissions can take a year or more. A realistic plan built on the steps above is the best predictor.
Who is responsible for quality after the transfer?
The brand owner remains the legal manufacturer and is ultimately accountable. Day-to-day responsibilities are split through the quality agreement, which is why it needs to be specific.
Is moving from one EMS provider to another different?
The steps are the same, with one added risk: the outgoing provider has little incentive to help. Secure documentation, tooling and last-time buys early, ideally under exit terms agreed in the original contract.
For the decisions to settle before any of this starts, see the medical device manufacturing transfer checklist. I lead product transfers and NPI programs for medical device manufacturers, including transfers to contract manufacturers. If one is on your roadmap, let’s talk.
