Test & Inspection
Reducing Test Result Scatter: A Crucial Step in Medical Device Testing
What if automation, even at a small scale, can turn expectations into concrete, 100% standard-compliant processes and results?

ZwickRoell zwickiLine for automated leak tests of vials. Image Source: ZwickRoell
The highly dynamic nature of the development, production, and application of medical devices demands testing processes that not only keep pace but remain consistent with standards and adhere to high safety protocols. In this industry, materials testing solutions that lag behind are not an option. Experienced manufacturers work closely with both international standards committees and materials testing system manufacturers to exchange knowledge that supports the development of new requirements, which are continuously integrated into the design of new testing solutions. This collaboration allows materials testing machine and instrument manufacturers to provide standard-compliant solutions in sync with the latest requirement publications, ensuring the highest possible quality of test results for their customers. The end result is reduced GR&R values and reduced test result scatter.
As requirements become increasingly intricate, accuracy, precision, and reliability are not just buzzwords but rather unforgiving principles that define the optimal acceptable testing process and results. In a labor market where qualified testing lab personnel are becoming increasingly scarce, medical device manufacturers and quality assurance supervisors rely on standard operating procedures that detail every step of the testing process, with the expectation that operators will meticulously follow suit. For some, this process works, while for others, it presents an additional challenge that affects not only quality but also time. But what if automation, even at a small scale, can turn expectations into concrete, 100% standard-compliant processes and results?
The medical industry is one of the most strictly regulated sectors, not only in terms of medicine but also biomedical devices and drug delivery systems. Material and component testing of the devices themselves plays a crucial role in the quality assurance, product approval, acceptance processes, and, more importantly, the safety of every patient. Especially in the medical industry, materials and component testing creates unique operational demands for precise, accurate, repeatable, and reliable work. Workflows must be repeated by-the-book every time, even when performed by different technicians at different labs. Data must be captured and reported with near-perfect accuracy. These requirements constitute day-to-day challenges for testing operations of any scale. Fortunately, automated materials testing can help.
Although automation can provide both time and cost savings, increasingly manufacturers of medical devices are recognizing that the most significant benefits of automated testing solutions are the reduction in test result scatter. Test result scatter refers to the variability in test outcomes that can occur due to differences in testing conditions, operator handling, and equipment performance. This is often captured through gage R&R analysis which evaluates the repeatability and reproducibility of test results. Inconsistent results can lead to delays in product approval, increased costs, and potential safety risks for patients. By implementing automated testing solutions, medical device manufacturers can achieve more consistent and reliable test results, thereby reducing scatter and enhancing overall product quality.
Automated materials testing systems are designed to perform tests with a high degree of precision and repeatability. These systems can control testing parameters with greater accuracy than manual methods, ensuring that each test is conducted under the same conditions. This consistency is crucial, as it eliminates the variability introduced by human operators. Additionally, automated systems can perform tests more quickly and efficiently, increasing the throughput of testing operations and allowing manufacturers to meet tight production schedules. They can come in a variety of forms ranging from semi-automated configurations that remove multiple test steps previously handled by operators to operator-assistance configurations where batches of specimens are tested in serial and parallel manners to, lastly, fully automated systems that take racks of large specimen batches and complete tests in an unmanned fashion.

Another advantage of automated testing is the ability to capture and analyze data in real-time. Automated systems can continuously monitor testing conditions and record data with high precision, providing a comprehensive and accurate record of each test. This data can be used to identify trends and patterns in test results, allowing manufacturers to pinpoint sources of variability and make necessary adjustments to improve consistency. By leveraging advanced data analytics, manufacturers can gain deeper insights into their testing processes and implement strategies to further reduce test result scatter.
As mentioned earlier, automated testing solutions can help address the challenge of limited qualified testing personnel. With automation, the need for highly skilled operators is reduced, as the systems can perform complex tests with minimal human intervention. This not only alleviates the burden on testing labs but also ensures that tests are conducted consistently, regardless of the operator's experience or expertise. As a result, manufacturers can achieve more reliable and reproducible test results, enhancing the overall quality and safety of their medical devices.

The reduction in test result scatter is a critical factor in the development and production of medical devices. Automated testing solutions offer a highly effective means of achieving this goal by providing consistent, accurate, and reliable test results. By embracing automation, medical device manufacturers can enhance testing processes, improve product quality, and ensure the safety of patients. As the industry continues to evolve, the adoption of automated testing solutions will become increasingly essential in meeting the stringent requirements and high standards of the medical field.
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