Dhr was reviewed and no issues were found.No non-conformities, similar complaint or deviation have been recorded for the subject lot number.Difficulty to get blood return could be a sign of catheter pinch-off or catheter flap.Catheter flap is probable cause of the reported problem.Catheter flap explanation: the catheter moved from its implanted position, the tip of the catheter was back up and a flap occurred.A flap could be created if the tip of the catheter is too close to the vessel wall (with the extremity of the catheter oriented to the vessel wall).During the aspiration the vessel wall is aspirated and come to close the extremity of the catheter.
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