Investigation summary: three unused sample units were received for evaluation by our quality engineer team.
Upon inspection of the samples, no defects were observed.
The expansion chambers of all three units expanded properly.
A device history record review did not reveal any deviations or non-conformances during the production of the provided lot number that could have contributed to the reported issue.
Based on the investigation results, a cause for the reported defect could not be determined.
It is important to note that if the protector is used more than once, the filter may become oversaturated and prevent proper air release to the expansion chamber.
The same resistance can occur if liquid accumulates in the internal face of the vial rubber stopper.
This is a single use device.
If the protector is used more than once, liquid of the vial can be accumulated over the filter oversaturating it.
An overpressure is created around the hydrophobic filter and no air can be released to the expansion chamber.
This can produces significant resistance to inject the air into the vial.
If liquid was accumulated in the internal face of the vial rubber stopper, it can pass through the protector cannula and be accumulated over filter causing the same effect (resistance to inject the air and leaks into the expansion chamber in case of overpressure).
It is recommended to carefully follow the instructions explained in the ifu.
Conclusion: this complaint is related to another complaint in which retained samples of the involved lot (#1702025) were taken for evaluation and no issues were found.
It is not possible to establish the root cause of the defect, as no issues were found in retained and received samples.
Based on the low severity and frequency of the defect, it was determined that no capa is required.
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