초록 ▼

A system for administering an anesthetic gas to a patient has a mask, means for supplying an anesthetic gas to the mask when the patient inhales, and an exhaust line having its proximal end connected to the mask and adapted to have its terminal end connected to a source of vacuum to exhaust gas from

A system for administering an anesthetic gas to a patient has a mask, means for supplying an anesthetic gas to the mask when the patient inhales, and an exhaust line having its proximal end connected to the mask and adapted to have its terminal end connected to a source of vacuum to exhaust gas from the mask when the patient exhales. A closed reservoir is in series with said exhaust line between the proximal and terminal ends thereof. The reservoir has an inlet and an outlet with a check valve adjacent to the inlet to prevent the flow of gas out of the reservoir through the inlet when the patient inhales. Advantageously, the reservoir check valve is a diaphragm valve and the face mask has at least one nozzle for scavenging gas escaping from the mask.

대표청구항 ▼

In a system for administering an anesthetic gas to a patient having a mask, means for supplying an anesthetic gas to said mask when the patient inhales, an exhaust line having its proximal end connected to the mask and adapted to have its terminal end connected to a vacuum system for exhausting gas

In a system for administering an anesthetic gas to a patient having a mask, means for supplying an anesthetic gas to said mask when the patient inhales, an exhaust line having its proximal end connected to the mask and adapted to have its terminal end connected to a vacuum system for exhausting gas from the mask to a remote atmosphere when the patient exhales, the improvement comprising: a closed reservoir having an inlet opening and an outlet opening connected in series with said exhaust line between the proximal and terminal ends thereof comprising a hollow body having an open end, a cap closing the open end and including said inlet opening connected to the portion of the exhaust line upstream of the reservoir, said outlet opening communicating said reservoir with a portion of the exhaust line downstream of the reservoir, an outlet valve mounted within said cap and having an inlet communicating with said inlet opening and an outlet communicating with said reservoir, said inlet defining a valve seat, a diaphragm mounted adjacent said seat in the cap with its periphery secured to the cap, said diaphragm being located in said cap such that one side of the diaphram is adapted to contact said seat and said inlet opening communicates with an area of said one side of the diaphram which is substantially larger than the area of the diaphram adapted to contact the valve seat to keep the diaphram against the valve seat when the patient is inhaling and to allow a free flow of gas when the patient is exhaling.