(b)(4).The rt319 adult breathing circuit is not sold in the usa but it is similar to a product which is sold in the usa.The 510(k) for that product is k983112.Method: the returned rt319 breathing circuit was visually inspected.Results: a cut was observed in the inspiratory limb.Conclusion: the position and direction of the cut indicated that the cut was caused by opening the box with a sharp object, such as a knife or boxcutter.As the customer had informed us that a boxcutter was used to open the circuit box, we can conclude that the damage was caused at this time.All rt319 breathing circuits are visually inspected and pressure tested for leaks before releasing for distribution.Any breathing circuit which fails any of these tests is discarded.The user instructions supplied with the rt319 breathing circuit state: check all connections are tight before use.Perform a pressure and leak test on the breathing system and check for occlusions before connecting to a patient.Set appropriate ventilator alarms.
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