(b)(4).The complaint devices were not returned to fisher and paykel healthcare in (b)(4) for evaluation.Therefore, our investigation is based on information provided by the customer, previous investigations of similar complaints and our knowledge of the product.The customer reported that their bc800 series infant nasal masks were detaching from the flexitrunk tubing.Without the return of the complaint devices, we are unable to determine what may have caused the problem reported by the customer.If the complaint devices were returned, they would have been visually inspected for any damage.In addition,the dimensions would have been measured and compared to drawing specifications.The user instructions that accompany the flexitrunk infant interface illustrate in pictorial format the correct set-up and proper use of infant interfaces, including the nasal mask and nasal tubing.It also states the following: "connect prongs and mask to nasal tubing ensuring that it is inserted fully."; "if using mask: connect to patient by placing mask around the nose.The mask should sit comfortably around the patient's nose.It must not occlude the nostrils or touch the septum and should not be over the lip or over the eyes."; "check that all circuit connections are tight before use and after any adjustment.".
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