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H3, h6: we have now concluded our investigation for the complaint received.A review of the batch manufacturing records could not be performed as no lot number was provided, however, there are no indications to suggest that the device did not meet specifications upon release into distribution.A complaint history review was carried out using the part number provided, there have been further complaints reported with this failure mode in the past three years.The device was used for treatment.It was reported that a seal could not be obtained.No samples were returned for analysis.A potential root cause for this problem is that there is an air leak within the device.This can be caused for a number of reasons including; dressing not applied properly, without creases and fixation strips.Filter / port not adhered to dressing correctly.Connector not correctly fastened and secured to the pump tubing trapped, folded over / kinked causing a blockage.Dressing integrity has been compromised.Skin has not been thoroughly dried before application of the dressing causing the dressing to not sufficiently adhere to the skin.The pump monitors the level of air leaks into the dressing.If there is an air leak anywhere in the dressing, the pump will make several attempts to regain negative pressure (vacuum) over a period of time (this could result in a louder than normal buzzing).It was also reported that the ¿dressing full light¿ was displayed when the dressing was not connected.This alarm also indicates a blockage which explains why it may have illuminated in the reported instance.We have not been able to confirm a relationship between the event and the device or identify a definitive root cause on this occasion.No further actions by smith and nephew are deemed necessary at this stage.However, we will continue to monitor for any adverse trends relating to this product range.Smith and nephew acknowledge customer concern and are continually investigating ways to develop and improve our products.
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