(b)(4).The sample was returned for evaluation.A visual exam was performed and it was observed that the translucent (expiratory) side of the limb displayed two areas that appear to be melted/damaged.The visual inspection also confirmed that the heated wires of the limb have not been misplaced, or "bunched" at any point in the circuit, which could cause temperatures high enough to melt the plastic tubing.The heated wires of the damaged/melted expiratory limb show no signs of damage or discoloration that might indicate the plastic insulation of the wires overheated.The damaged areas show melting taking place on top of the circuit pipe ridges which suggest the circuit limb might have come in contact with something hot from an external source instead of the internal heated wire.Based on the investigation performed, the reported complaint was confirmed.Although the complaint was confirmed, a root cause for the melted circuit could not be determined.A conclusion code could not be found as the complaint was confirmed; however, a root cause was not established.
|