The test specimen is then aspirated and monitored for the presence of air bubbles after the first five (5) seconds of testing until ten (10) additional seconds have passed (total of 15 seconds).The PFR established the variability of the occlusion method depending on the operator and how tight the Tuohy Borst is tightened over the catheter and mandrel can cause samples to falsely ‘fail’ due to ingress of air through the distal end of the microcatheter.Units were then tested to a redlined TM0386E with the distal end of the microcatheter UV cured with adhesive to ensure complete occlusion.