Abstract: A breathing circuit system for delivering gas from a fresh source to a user through a face mask. The system includes a cylindrical housing and a resiliently-biased valve supported substantially centrally within the housing. In the default or “off” position, the resilient bias causes the valve to be seated on a valve seat shutting off axial flow of gas through the valve housing. When the patient or user breathes, negative pressure is applied to one side of the valve effective to sufficiently overcome the resilient bias imposed on the valve to move the valve off the valve seat axially (or otherwise open in another direction) within the housing, thereby allowing flow of gas through both the valve seat and the valve housing, and into the breathing circuit connected thereto. When the patient's breathing pauses and begins to exhale, the valve bias returns the valve to its default or off condition shutting off flow of gas through the valve.

Abstract: A disposable breathing circuit is adapted to be connected between a disposable face mask and a vacuum source for delivering fresh gas to the face mask and for scavenging waste gas exhaled from the face mask. The breathing circuit includes a fresh gas supply limb and an exhalation limb, and a scavenging limb coupled to the exhalation limb. The scavenging limb includes a one-way valve to prevent re-breathing, a flexible flow-through reservoir bag used to store exhaled gas, and an output tube adapted to be coupled between the flow-through reservoir bag and the vacuum source.

Abstract: A gas flow valve assembly. The assembly includes a cylindrical housing and a resiliently-biased valve supported substantially centrally within the housing. In the default or “off” condition, the resilient bias causes the valve to be seated on a valve seat shutting off axial flow of gas through the valve housing. When the patient breathes, negative pressure is applied to one side of the valve effective to sufficiently overcome the resilient bias imposed on the valve to move the valve off the valve seat axially (or otherwise open in another direction) within the housing, thereby allowing flow of gas through both the valve seat and the valve housing, and into the breathing circuit connected thereto. When the patient's breathing pauses and begins to exhale, the valve bias returns the valve to its default or off condition shutting off flow of gas through the valve.

Abstract: A disposable breathing circuit is adapted to be connected between a disposable face mask and a vacuum source for delivering fresh gas to the face mask and for scavenging waste gas exhaled from the face mask. The breathing circuit includes a fresh gas supply limb and an exhalation limb and a scavenging limb coupled to the exhalation limb. The scavenging limb includes a one-way valve to prevent re-breathing, a flexible flow-through reservoir bag used to store exhaled gas, and an output tube adapted to be coupled between the flow-through reservoir bag and the vacuum source.

Abstract: A disposable breathing circuit is adapted to be connected between a disposable face mask and a vacuum source for delivering fresh gas to the face mask and for scavenging waste gas exhaled from the face mask. The breathing circuit includes a fresh gas supply limb and an exhalation limb and a scavenging limb coupled to the exhalation limb. The scavenging limb includes a one-way valve to prevent re-breathing, a flexible flow-through reservoir bag used to store exhaled gas, and an output tube adapted to be coupled between the flow-through reservoir bag and the vacuum source.

Abstract: A respiratory face mask is provided suitably sized and configured to engage the nose portion, mouth portion and chin portion of a patient's face. The face mask is characterized by a cup-like shell or receptacle member defining a peripheral flange and a flexible inflatable hollow sealing cushion on the shell member flange. Headstrap fastener projections extending upright on the flange are adapted to accommodate an elastic headstrap that adjustably may be removably slidingly coupled to the projections to hold the mask in place on a patient's face and head.

Abstract: A disposable breathing circuit is adapted to be connected between a disposable face mask and a vacuum source for delivering fresh gas to the face mask and for scavenging waste gas exhaled from the face mask. The breathing circuit includes a fresh gas supply tube, a flexible flow-through exhalation bag, an exhalation tube disposed between the face mask and an entry port of the exhalation bag, and a scavenging tube disposed between an exit or of the exhalation bag and the vacuum source. The exhalation tube includes a one-way valve to prevent re-breathing.

Abstract: A demand valve is fixedly and rigidly mounted on an anesthetic gas mixer stand in close proximity to the gas mixer. A single-patient-use disposable breathing and scavenging circuit is adapted to be removably connected to the demand valve output for permitting a patient to breath gas, or a mixture gases, supplied by the gas mixer through a remotely located disposable face mask included as a portion of the breathing circuit. The breathing circuit further includes a scavenger portion for collecting exhaled waste gas from the face mask. The scavenger portion of the circuit also is disposable.

Abstract: An ambient or room air vacuum attachment or nozzle is provided proximal to the connection between a breathing circuit and the protruding inlet port of a respiratory face mask, and a tubular passageway is sealingly connected between the vacuum attachment or nozzle and a source of vacuum. By virtue of such structure, any gas escaping from the periphery of the respiratory face mask through accident or otherwise is immediately and automatically “vacuumed-up” by the proximally located vacuum attachment or nozzle and evacuated from the surrounding room environment through the vacuum source to which the ambient air vacuum nozzle and tubular passageway are connected.

Abstract: A disposable anesthesia face mask comprising a shell member having an annular flange and a do-nut shaped pneumatic sealing cushion attached to the shell member annular flange. The shell member and its flange are “pear-shaped” defining a nasal portion of first transverse extent, a mouth portion of second transverse extent, and an under-the-chin engagement portion of third transverse extent where the second transverse extent is greater than the first transverse extent and the third transverse extent is greater than the second transverse extent.

Abstract: An ambient or room air vacuum attachment or nozzle is provided proximal to the connection between a breathing circuit and the protruding inlet port of a respiratory face mask, and a tubular passageway is sealingly connected between the vacuum attachment or nozzle and a source of vacuum. By virtue of such structure, any gas escaping from the periphery of the respiratory face mask through accident or otherwise is immediately and automatically “vacuumed-up” by the proximally located vacuum attachment or nozzle and evacuated from the surrounding room environment through the vacuum source to which the ambient air vacuum nozzle and tubular passageway are connected.

Abstract: A respiratory face mask is provided suitably sized and configured to engage at least the nose portion and mouth portion of a patient's face. Gas from a gas supply and scavenging set normally used in dentistry is operatively coupled to the mask via a breathing circuit to supply fresh gas and evacuate exhaled waste gas. A gas flow compensator in the breathing circuit automatically prevents re-breathing of exhaled gas. Because the mask has a sealing cushion, contamination of the clinical room where the apparatus is being used also is avoided. In an alternatively preferred embodiment, the fresh gas supply tube and the exhalation limb of the breathing circuit are replaced by a single length of co-axial flexible tubing connected between the face mask and a branched coupling. The branched coupling, in turn, includes a first branch for connection to the fresh gas supply nozzle of the “dental” set-up and a second branch for connection to a flexible flow-through reservoir bag used to store waste or exhaled gas.

Abstract: A respiratory face mask is provided suitably sized and configured to engage at least the nose portion and mouth portion of a patient's face. Gas from a gas supply and scavenging set normally used in dentistry is operatively coupled to the mask via a breathing circuit to supply fresh gas and evacuate exhaled waste gas. A gas flow compensator in the breathing circuit automatically prevents re-breathing of exhaled gas. Because the mask has a sealing cushion, contamination of the clinical room where the apparatus is being used also is avoided.

Abstract: A respiratory face mask is provided suitably sized and configured to engage the nose portion, mouth portion and chin portion of a patient's face. The face mask is characterized by a cup-like shell or receptacle member defining a peripheral flange and a flexible inflatable hollow sealing cushion on the shell member flange. Headstrap fastener projections extending upright on the flange are adapted to accommodate an elastic headstrap that adjustably may be removably slidingly coupled to the projections to hold the mask in place on a patient's face and head.

Abstract: A disposable anesthesia face mask suitably sized and configured to engage the nose portion, mouth portion and chin portion of a patient's face comprises a cup-like shell or receptacle member and a flexible inflatable hollow sealing cushion attached to the shell member on a flange thereon and wherein the shell member includes first passageway means for coupling to a breathing circuit, and a second passageway for connection to a flexible tube which, in turn, is adapted to be connected to a CO2 monitoring machine or capnograph. The face mask shell nasal portion has a first width, the face mask shell mouth portion has a second width greater than the first width, and the face mask shell chin portion has a third width greater than the second width. The nasal, mouth and chin portions are continuous and form the cup-like extent of the shell or receptacle member giving it a characteristic “pear” shape.