Device for administering an anesthetic gas

Claim 2

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.

Claim 3

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 the 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, a depending tube extending from said outlet of said outlet valve to the bottom of the reservoir and having an opening at the bottom of the tube providing communication with the interior of the reservoir, the upper end of the tube being connected to the outlet opening of the reservoir.

Claim 4

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 the 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, a depending tube extending from said outlet of said outlet valve to the bottom of the reservoir and having an opening at the bottom of the tube providing communication with the interior of the reservoir, the upper end of the tube being connected to the outlet opening of the reservoir.

Claim 5

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 in series with said exhaust line between the proximal and terminal ends thereof, said reservoir having an inlet connected to the portion of the exhaust line upstream of the reservoir and an outlet connected to the portion of the exhaust line downstream of the reservoir, means in said reservoir for preventing the flow of gas through the inlet when the patient inhales, and a nozzle secured to one side of the face mask for scavenging gas escaping from the mask and a second exhaust line connecting said nozzle directly to the reservoir downstream of the flow preventing means.

Claim 6

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 in series with said exhaust line between the proximal and terminal ends thereof, said reservoir having an inlet connected to the portion of the exhaust line upstream of the reservoir and an outlet connected to the portion of the exhaust line downstream of the reservoir, means in said reservoir for preventing the flow of gas through the inlet when the patient inhales, and a nozzle secured to one side of the face mask for scavenging gas escaping from the mask and a second exhaust line connecting said nozzle directly to the reservoir downstream of the flow preventing means.

Claim 7

The system of claim 3 having a second nozzle secured to the other side of the face mask for scavenging gas escaping from the mask and a third exhaust line connecting said second nozzle directly to the reservoir downstream of the flow preventing means.

Claim 10

The system of claim 5 having a second nozzle secured to the other side of the face mask for scavenging gas escaping from the mask and a third exhaust line connecting said second nozzle directly to the reservoir downstream of the flow.