Medical devices are designed to operate in an environment where reliability is important. A minor change in a component, an uncontrolled manufacturing process or lack of documentation can impact on the safety or performance of the final product. With manufacturing going global, it has become more important to ensure the same quality of products at all manufacturing sites, suppliers, and production batches.
Process validation offers a systematic approach to establishing the ability of manufacturing processes to consistently generate products that meet specified requirements. It brings together engineering, production, quality assurance, documentation and regulatory controls all in one traceable system. Validation – when done correctly is not just a compliance activity. It turns into a basis for steady manufacturing.
Why Process Validation Matters in Medical Manufacturing
There are a number of variables to consider when making medical devices, such as raw materials, equipment settings, environmental conditions, software, tooling, and operator activity. Without proper control of these variables, a different result could be obtained from batch to batch using the same manufacturing process. Process validation can be used to detect and manage these variables prior to product variation that is unacceptable.
Quality control for medical devices, for manufacturers, must go beyond the final product testing. Certain characteristics cannot be completely verified on the final device. A validated process is one that has documented evidence that critical manufacturing activities are performed in a repeatable manner, resulting in consistent outcomes.
Key Stages of Medical Device Process Validation
A good validation program typically has a well defined life cycle. Depending on the device, the manufacturing process, the regulations that apply and the risk profile, the approach may differ. In general, however, manufacturers set requirements, determine critical process parameters, perform qualification activities, and perform ongoing monitoring of performance.
- Process Definition: Defines the way the manufacturing process should be conducted and the critical inputs and outputs.
- Risk Assessment: Identifies process parameters that may impact product safety, performance or compliance.
- Equipment Qualification: Verifies that equipment, tooling and supporting systems are installed and functioning to the requirements.
- Process Qualifications: Capability of the process to meet predetermined acceptance criteria.
- Performance Monitoring: Verifies stability of the validated process over time using production data.
- Change Control: Determines if changes to equipment, materials, software, or procedures need to be validated.
- Documentation: Provides objective evidence of what was tested, how it was tested and whether requirements were met.
The use of this lifecycle approach establishes a traceable link between process requirements and actual manufacturing performance. It also allows investigations to be easier as quality teams can access the historical validation data when a deviation or nonconformity occurs.
The Role of Risk Management
Process validation is an important part of risk assessment as not all manufacturing parameters are equally important in product quality. A slight cosmetic difference might mean something different than a dimensional difference that will impact the function of an implantable component. Manufacturers should therefore focus on controls based on the potential risk.
Failure Mode and Effects Analysis can be used to pinpoint potential failure points and decide on controls. The critical process parameters can be monitored more closely, and the less critical parameters can be monitored at a reduced intensity. This risk-based approach enables companies to concentrate their resources on areas where they can make the most impact on product safety and consistency.
Building Traceability Across Production
Traceability links materials, processes, equipment, operators, inspection results and finished products. Without reliable records, it can be difficult to determine exactly what happens when a quality problem occurs. A good traceability system provides a history that enables the manufacturer to systematically investigate issues.
Digital manufacturing platforms can enhance this process by connecting production records, equipment data, batch information, inspection results, and quality events. A barcode system, electronic batch records and automated data capture can help eliminate manual mistakes and facilitate easier retrieval of information. This is especially useful in the case of products produced at several factories.
Managing Changes After Validation
Validation isn’t necessarily finished once a process has been qualified. Manufacturing processes are constantly evolving. Companies can replace equipment, alter software, add different materials, change suppliers, or relocate production to a different facility. Every change may impact the validated state of the process.
A formal change control procedure is used to help assess the impact of these changes. Manufacturers may require further testing, partial requalification or process revalidation, depending on the type and level of risk of the change. The key is to assess the change before it is implemented, not after problems are encountered in production.
Challenges in Global Medical Device Manufacturing
It can be difficult to keep the same validation in different manufacturing sites. The equipment, suppliers, operating procedures, and documentation systems used may vary among different facilities. Local processes may vary, even if the same specification is used, causing extra risks.
Another difficulty is keeping up with complete documentation throughout the evolution of products. Quality data may be generated from engineering changes, supplier changes, software updates and process improvements. If there is no robust document control and version management, teams can have difficulty knowing which requirements or validation records are relevant to a specific production configuration.
Conclusion
Process validation offers a structured approach to the manufacturer to show that critical production processes can consistently produce products that satisfy established requirements. With risk management, traceability, equipment qualification, and effective change control, it provides a better platform for consistent manufacturing and regulatory compliance.
Finally, Manufacturing process audit activities can be used to ensure that validated processes are actually being used on the production floor. This linkage between validation and continuous process monitoring enables manufacturers to detect deviations, keep process control, and ensure the long-term reliability of medical device manufacturing.
