During my time in a regulated medical device test engineering environment, I designed and built custom test fixtures to support verification testing of intravascular catheters in accordance with ISO 10555 requirements. These fixtures were developed to address variability and operator dependence in existing test setups while also enabling lubricity testing to be brought in-house, reducing reliance on external testing. My individual contribution focused on translating ISO-based test intent into physical fixture designs that were compatible with existing lab equipment and capable of producing repeatable, quantitative data for flow rate and lubricity performance under simulated-use conditions. I iterated on fixture geometry, alignment features, loading conditions, and fluid routing to minimize external sources of variation and ensure results reflected true device performance rather than test artifacts. Bringing lubricity testing in-house reduced testing turnaround time and external costs while improving data accessibility and iteration speed during verification activities. The final designs improved repeatability, reduced operator-to-operator variability, and increased confidence in verification data used to demonstrate compliance with ISO 10555 performance requirements.