|
Manufacturer statement: for evaluation of the malfunction dhr documents were reviewed.They demonstrate that the catheter neurovent-p (sn (b)(4)) met specification during manufacturing.Final inspection of the finished catheter was passed.This demonstrates that the catheter has been manufactured and sold in conformance to relevant specifications.Furthermore the returned catheter was investigated, see evaluation summary.An initial checkup in air at room temperature was performed.The catheter showed a static value of 389.1 mmhg on the monitor which is clearly out of specification.The connector was opened and visually inspected to check if the pcb was exposed to moisture or a high pulling force.All wires of the micro cable were still connected to the soldering pads of the pcb and no residues of moisture could be detected.Additionally, the pins on the plug were checked and no abnormalities were found.It was also investigated if the microchip shows any signs of mechanical damage.The measurement window was visually inspected and a damage on the silicone covering above the pressure chip was found.Those were located directly on the silicone layer and even reached the chip directly, which is considered as critical for correct catheter functionality.A subsequent visual inspection clearly shows deeper damaging directly at the chip itself.The chip was lifted from the measurement window and a crack in the chip membrane is also visible on the back side.This damage on the silicone cover is due to mechanical manipulation with surgical tools and therefore, this incident is handled as an user error.The instructions for use zwo-013 according to section 6 precautions were not sufficiently observed.Precaution: the precision pressure catheters are precision measuring instruments and should be treated accordingly.Precaution: prior and during the examination, the pressure catheter must not be bent, stretched or squeezed as well as manipulated by surgical tools.
|