Patent ID: 8726900

Claim:
An apparatus for supplying an anesthetic gas, or mixture of gases to a patient on demand, comprising: a gas mixer mounted on a stand; a demand valve; a hose providing fluid communication between said gas mixer and said demand valve; a disposable face mask in fluid communication with said demand valve; a support connected to said stand proximal to said gas mixer, said demand valve being securely mounted on said support in a stationary location relative to and proximal to said gas mixer; a disposable breathing and scavenging circuit, said breathing and scavenging circuit providing fluid communication between said disposable face mask and said demand valve such that said disposable face masks and said patient are situated remotely with respect both to said gas mixer and said demand valve; said disposable breathing and scavenging circuit including a first and a second length of flexible tubing, said first length nested in a lumen of said second length so that said first and second lengths collectively form a flexible, coaxial tubing; a gas coupling having first and second branches, said first branch having a first end and a second end and said second branch having a first end and a second end; said second end of said first branch of said gas coupling in fluid communication with said demand valve; said first end of said first branch of said gas coupling in fluid communication with a second end of said first length of flexible tubing; a first end of said first length of flexible tubing in fluid communication with said disposable face mask; a flexible compliant reservoir bag having a top, entry opening and a bottom, exit opening so that it is a flow-through bag; said first end of said second branch of said gas coupling in fluid communication with a second end of said second length of flexible tubing; said second end of said second branch of said gas coupling in fluid communication with the top, entry opening of said flexible compliant reservoir bag; a first end of said second length of flexible tubing in fluid communication with said disposable face mask; a scavenging tube connected to said bottom, exit opening of said flexible compliant reservoir bag; and said scavenging tube adapted to provide fluid communication between said flexible compliant reservoir bag and a remote source of vacuum.