Abstract A gas evacuator for removing excess gas conveyed to a patient through a duct from a gas supply. The device includes a conduit connectable to the gas duct to convey the gas from one portion of the duct to another portion thereof. A chamber is provided with a drain line connectable to a low pressure source, such as a vacuum pump, for maintaining a reduced pressure in the chamber. A first valve is provided for venting excess gas from said conduit to said chamber in response to the differential pressure therebetween. A second valve is provided to introduce gas to said chamber from atmosphere in response to pressure in the chamber. The chamber is kept under low pressure by the vacuum pump. At a desired value of low pressure, the second valve opens to maintain that pressure in the chamber. If excess gas is present in the duct, the first valve opens venting that excess gas to the chamber until the excess gas is removed. The vented gas is removed through the drain line. In the event of a temporary increase in pressure in the chamber above the mentioned desired value, the second valve closes thus ensuring that the excess gas removed from the duct is not vented to atmosphere in the area adjacent the device.
Gas evacuating apparatus for removing excess gas from a duct in which said gas is flowing comprising: a conduit connectable to said duct to convey said gas from one portion of said duct to another portion thereof; a chamber; a drain line from said chamber connectable to a low pressure source for maintaining a reduced pressure in said chamber; first valve means responsive to differential pressure between said conduit and said chamber for venting excess gas from said conduit to said chamber; second valve means responsive to pressure in said chamber for introducing gas from atmosphere into said chamber to maintain a desired pressure therein.
Claim 2
Dependent Claim
105 words
Gas evacuating apparatus for removing excess gas from a duct in which said gas is flowing comprising: a conduit connectable to said duct to convey said gas from one portion of said duct to another portion thereof; a chamber; a drain line from said chamber connectable to a low pressure source for maintaining a reduced pressure in said chamber; first valve means responsive to differential pressure between said conduit and said chamber for venting excess gas from said conduit to said chamber; second valve means responsive to pressure in said chamber for introducing gas from atmosphere into said chamber to maintain a desired pressure therein.
Claim 3
Dependent Claim
15 words
Apparatus according to claim 1 including a gas reservoir in gas communication with said chamber.
Claim 4
Dependent Claim
12 words
Apparatus according to claim 2 wherein said reservoir comprises a flexible container.
Claim 5
Dependent Claim
20 words
Apparatus according to claim 3 wherein said reservoir comprises an elongate tube open at an end remote from said chamber.
Claim 6
Dependent Claim
16 words
Apparatus according to claim 1 further including means to maintain a low pressure in said chamber.
Claim 7
Dependent Claim
18 words
Apparatus according to claim 1 including gas supply means for supplying a flow of gas through said duct.
Claim 8
Dependent Claim
18 words
Apparatus according to claim 1 including conduit means for conveying gas flowing through said duct to a patient.