TheSealBainModuleCoverBCGB/SMechanicalisusedinBainmodelassemblyinBreathingCircuitGasModulewhichcomesunderthemodalityofAnesthesiaDelivery.ThisBainmodulecircuitishavingthefreshgassupplytuberunscoaxiallyinsidethecorrugatedtubing.Thediameteroftheoutertubingis22mmandinnertubesis7mm.Lengthofthecircuitis1.8meters.Outertubeistransparentsothatinnertubecanbeseenforanydisconnectionorkinking.Lengthofthecircuitcanbeincreasedtomodifyitforuseatremotelocations.Variousstudieshavebeendonetoanalyzeitsefficiencyafterincreasingitslength.Itisseenthatasthelengthincreases,theresistanceincreasesduringspontaneousbreathing.Also,ventilatorsettingsshouldbeadjustedtodeliversettidalvolumewithlongBain'scircuitasthereisreductioninthepeakinspiratorypressureandtidalvolumewithincreasedlengthofthecircuit.Thepatientinspiresfreshgasfromthecircuit,andexcessgasesareventedoutthroughtheAPLvalveduringexpiration.IncontrolledventilationtheAPLvalveiskeptpartiallyclosedandpatientisventilatedbysqueezingthereservoirbag.Hereexcessgasesareventedoutduringinspiration.ThispartiswidelyusedinAestiva7900,Aestiva7100andAestivaMRI.Thepartisdiligentlydesignedforsuperiorperformanceandreliability.Itissecurelypackedinsideahighqualitypackingboxtoavoidphysicaldamageduringtransitandlabeledwithdetailsabouttheproduct,QualityAssurance(QA)sealandshipmentdetails.