The device was not received for evaluation; however, based on the event description, is likely that when change syringe procedure was started, the user didn¿t lock the syringe plunger clip as required by the operator manual.After securing it properly, the same event did not happen again.An undisclosed clinical manoeuvre determined the pressure condition which caused an undesired heparin bolus being delivered to the patient.A negative filter pressure in conjunction with the unlocked syringe arm could lead to undesired delivery heparin.There was no malfunction of the prismax device.The cause of the reported condition was associated with a use error when attaching the heparin syringe incorrectly.The operator¿s manual of prismax (section connecting sets and fluids ¿ syringe) instructs the user that the ¿syringe installation is complete when the syringe test pass and the plunger clip is closed¿.In addition, the section - systemic anticoagulation ¿ requires that the user - when changing the syringe ¿ shall closing the plunger clip lock.A service history review was performed and revealed that the device has no previous service events; therefore, servicing did not cause or contribute to the reported event.Should additional relevant information become available, a supplemental report will be submitted.
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