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The customer reported that chat in nuclear radiology stated that the injection pumps were not recording the correct volume.He would setup a syringe with a 30 ml dose, but the bd alaris syringe pump would show a 32.5 volume.He was using the same setup as he always did: monoject 35 ml.He also mentioned that he got new syringes, and that the new syringes were easier to operate.After doing test with the new syringe, the initial reporter was able to confirm across every test point that the new monoject syringes were constantly about 2.4 to 2.5 ml off (extra)- they would setup a 20 ml injection, but the bd alaris showed 22.4 ml.This variance was consistent for 10,20, 30 and 35 ml.See pic for the 20 ml syringe setup- on the screen it shows'available 22.4 ml' they recalibrated the syringe pump, same results.They tried the syringe on different syringe pumps, same result, so they can rule out a bad syringe pump.Found an old syringe.Tested it.It was accurate to within a 0.2ml, which is just a drop.So they examined both syringes and found that the new monoject 35 ml syringes have a longer barrel.Since the bd alaris calibration is determined from the amount of the barrel above the zero line (the end part of the syringe body that clamps into the pump) this is causing the bd alaris to inaccurately estimate the total volume in the syringe.They are not sure if it will actually cause the reported total volume infused to be different or not.They would have to run additional test.They do not know how the bd syringe pump calculates the final volume once the pump has pressed down on the syringe to the stop point.
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