Contract Assembly for Medical Device OEMs: What's Different

The category difference

Medical device contract assembly and industrial contract assembly look similar on the surface. Same production floor. Similar equipment. Similar operator skill sets. Under the surface, they are different disciplines with different quality systems, different documentation requirements, and different regulatory exposure.

OEMs who assume they can source their medical assembly work from a general-purpose industrial contract manufacturer usually learn the difference during their first FDA audit.

The quality system difference

Industrial contract manufacturers typically operate under ISO 9001 (or AS9100 for aerospace, IATF 16949 for automotive). These are strong quality systems, but they are not the same as ISO 13485 — the quality system standard specific to medical devices.

ISO 13485 requires: risk-based design controls tied to device intent, design history file documentation, process validation for anything that can't be verified through inspection, corrective and preventive action processes that tie back to complaint handling, and periodic management review of the QMS itself.

An ISO 9001-certified shop can produce medical device assemblies. But without ISO 13485 discipline, the documentation trail that FDA and notified bodies expect will not be there.

The documentation difference

For a general industrial assembly, the documentation trail is: BOM, drawing, work instruction, inspection record. That is sufficient for most industrial applications.

For a medical device sub-assembly, add: device master record (DMR) reference, device history record (DHR) per lot, process validation documentation (IQ/OQ/PQ), material traceability with lot-level records, biocompatibility certifications for materials in patient contact, sterilization compatibility statements, and complaint-response linkage back to specific lots.

The material selection difference

Not every wire, connector, cable, or adhesive is appropriate for medical applications. Some materials need biocompatibility certification (ISO 10993). Some need sterilization-compatible ratings. Some can be used in the manufacturing environment but not in the finished device. A contract manufacturer who does not distinguish between these will spec the wrong material and disqualify the finished device.

The failure modes that hurt

• Uncontrolled material substitutions that break biocompatibility
• Missing process validation on a step that produces variation the inspection does not catch
• Traceability gaps that make a complaint investigation impossible
• Change orders processed without design control impact assessment
• Assembly deviations that never get recorded, so the DHR does not match the actual build

What to look for in a medical device contract partner

• ISO 13485 certification, current and audited
• FDA registration as a contract manufacturer if applicable
• Documented experience with your device class (Class I, II, III have different requirements)
• Process validation capability (IQ/OQ/PQ) for the specific processes your device requires
• Traceability that goes to lot level, minimum
• Change control discipline that maintains the design history file

The DPG position on medical device work

DPG does not currently market medical device contract assembly. Our operating companies serve heavy industrial, OEM equipment, and semiconductor capital equipment markets. For medical device work with strict Class II or Class III requirements, we would recommend a specialized medical CM.

Where we can help: industrial equipment OEMs whose products are used in medical device manufacturing plants (test equipment, packaging equipment, automation for medical CM lines). Those programs run under industrial quality systems even though the end customer is in the medical space.

If you are unsure which category your program falls into, that is a conversation we are happy to have.