Manufacturing a medical device is ordinary manufacturing under an extraordinary evidence requirement. The processes are the same ones used everywhere else; what differs is that each is validated before use, each lot is traceable, changes are controlled, and the whole history of every device can be reconstructed from records years afterwards.
Design transfer and the specification
Manufacturing begins with a device master record: the drawings, specifications, process instructions, quality procedures and packaging that together define how the device is made. Design transfer is the controlled handover from development to production, and it is the point at which the manufacturing process has to become documented, repeatable and measured rather than a set of practices.
Process validation
Where a process output cannot be fully verified by inspection, and moulding, welding, sterilisation and cleaning are typical examples, the process itself must be validated: proven to produce conforming output consistently across its operating range. That is an evidence package, maintained over time, and it is what allows a manufacturer to release product without inspecting every unit destructively.
Traceability and the device history record
Every lot carries its materials, its components, the equipment and settings used, who performed each operation and the results of every check. Assembled together that is the device history record, and it is what allows a defect found in the field to be bounded to a set of units rather than to everything ever made. Traceability is designed into the flow rather than reconstructed afterwards.
Change control and CAPA
No change to a validated process is made without assessment of its impact and a documented decision, including changes to suppliers, materials, tooling and equipment. When something does go wrong, a corrective and preventive action process investigates the cause and verifies the fix. Both are the mechanisms that stop a quality system decaying quietly over years of small adjustments.
Questions people ask about medical device manufacturing process
What is process validation?
Proving that a process consistently produces conforming output across its operating range, required where the output cannot be fully verified by inspection afterwards.
What is a device history record?
The assembled record for a lot: materials, components, equipment and settings used, operators, and the results of every check performed.
Why is change control so strict?
Because a validated process is only validated as it was validated. A supplier, material or tooling change can invalidate it, so each is assessed and documented.
Does this apply to a component supplier?
In proportion to the component's risk. A supplier of a critical component will be qualified and audited and expected to operate equivalent controls.