Claims
- 1. An emergency oxygen system for an anesthesia system, said system comprising;
- an oxygen conduit for delivering oxygen from a source of oxygen to an outlet,
- a gas conduit for delivering at least one other gas from a source of at least one other gas, said gas conduit having a shut-off valve in said conduit for controlling the flow of gas from said source of said at least one other gas,
- a first flow control valve in said oxygen conduit and a second flow control valve in said gas conduit, said first and second flow control valves adapted to establish a desired proportion of oxygen and said at least one other gas to supply a mixed gas in the desired proportion to said outlet through a supply conduit coupled to said oxygen conduit and gas conduit,
- a processor controlling the condition of said first and second flow control valves to achieve the desired proportion of oxygen and said at least one other gas at said outlet,
- gas sensors located downstream of each of said first and second flow control valves and upstream of said supply conduit, to monitor the mixture of gases from said first and second flow control valves to determine that said control valves are providing the desired proportion of oxygen and the at least one other gas,
- a bypass conduit for said oxygen conduit and connected so as to allow oxygen to bypass said first flow control valve, said bypass conduit having a means to control the flow of gas through said bypass conduit,
- means to close the shut off valve in the said gas conduit if the said gas sensors indicate the proportion of oxygen is not within a desired range, and
- alarm means to provide an indication to a user that the proportion of oxygen is not within the desired range.
- 2. An emergency oxygen system for an anesthesia system as defined in claim 1 wherein said means to control the flow of gas in said bypass conduit is a needle valve.
- 3. An emergency oxygen system for an anesthesia system as defined in claim 1 wherein said means to close the shut off valve further prevents oxygen from flowing through said first flow control valve.
- 4. An emergency oxygen system for an anesthesia system as defined in claim 1 wherein said first flow control valve and said second flow control valves are both proportioning valves.
- 5. An emergency oxygen system for an anaesthesia system as defined in claim 1 wherein said bypass conduit is further defined as connected to allow oxygen to bypass said first and second control valves.
- 6. An emergency oxygen system for an anesthesia system, said system comprising;
- an oxygen conduit for delivering oxygen from a source of oxygen to an outlet,
- a gas conduit for delivering at least one other gas from a source of at least one other gas, said gas conduit having a shut-off valve in said conduit for controlling the flow of gas from said source of said at least one other gas,
- a first flow control valve in said oxygen conduit and a second flow control valve in said gas conduit, said first and second flow control valves adapted to establish a desired proportion of oxygen and said at least one other gas to supply the mixed gas in the desired proportion to said outlet,
- a processor controlling the condition of said first and second flow control valves to achieve the desired proportion of oxygen and said at least one other gas at said outlet,
- gas sensors located downstream of said first and second flow control valves to monitor the mixture of gases from said first and second flow control valves to determine that said control valves are providing the desired proportion of oxygen and the at least one other gas,
- a bypass conduit for said oxygen conduit and connected so as to allow oxygen to bypass the first flow control valve in said oxygen conduit and the second flow control valve in said gas conduit, a bypass valve having a first condition where the oxygen passes through said first flow control valve and a second condition wherein said oxygen flows through said bypass conduit around said first and second flow control valves, said bypass conduit having a means to control the flow of oxygen in said bypass conduit and further having a means to monitor the flow in said bypass conduit, and
- alarm means responsive to a gas sensor to provide an indication to a user when the concentration of oxygen is not the desired proportion whereby said bypass valve can be activated to divert said flow of oxygen to said bypass conduit.
- 7. An emergency oxygen system for an anesthesia system as defined in claim 6 wherein said bypass valve is manually operable by a user.
- 8. An emergency oxygen system for an anesthesia system as defined in claim 6 wherein said bypass valve is electrically operated by a signal from said processor.
- 9. An emergency oxygen system for an anesthesia system as defined in claim 6 wherein said flow control valves are proportioning valves.
- 10. An emergency oxygen system for an anesthesia system as defined in claim 6 wherein said at least one other gas comprises air supplied through an air conduit and nitrous oxide supplied through an nitrous oxide conduit.
- 11. An emergency oxygen system for an anesthesia system as defined in claim 10 wherein said nitrous conduit and said air conduit each include separate shut-off valves.
- 12. An emergency oxygen system for an anesthesia system as defined in claim 6 wherein said oxygen flow sensor in said bypass line comprises a flow tube visually readable by the user.
- 13. An emergency oxygen system for an anesthesia system, said system comprising:
- an oxygen conduit adapted to be connected to a source of oxygen for delivering the oxygen to an outlet,
- a gas conduit adapted to be connected to a source of a gas for delivering the gas to an outlet, said gas conduit having a shut-off valve for controlling the flow of gas from the source through said gas conduit,
- a first flow control valve in said oxygen conduit and a second flow control valve in said gas conduit, said flow control valves adapted to establish a desired proportion of oxygen and gas to supply a mixture of oxygen and gas in a desired proportion to said outlet,
- a processor controlling the condition of said first and second flow control valves to achieve the desired proportion of oxygen and gas to said outlet,
- an oxygen flow sensor in said oxygen conduit and a gas flow sensor in said gas conduit, said processor adapted to monitor the flow sensors to determine that said first and second flow control valves are providing the desired flows of oxygen and gas, and
- a bypass conduit for said oxygen conduit and connected so as to allow oxygen to bypass the first flow control valve, a bypass valve having a first condition wherein the oxygen passes through said first flow control valve and a second condition wherein said oxygen flows through said bypass conduit around said first flow control valve,
- said processor adapted to determine when the flows sensed by said oxygen flow sensor and said gas flow sensor are not within a predetermined range of flows thereupon closing said shut off valve and operating said bypass valve to said second condition to divert oxygen around said first flow control valve to said outlet.
- 14. An emergency oxygen system for an anesthesia system as defined in claim 13 wherein said bypass conduit includes a means to control the flow of oxygen in said bypass conduit and further has a means to monitor the flow in said bypass conduit.
- 15. An emergency oxygen system for an anesthesia system as defined in claim 13 wherein said means to control the flow of oxygen comprises a manually operable needle valve.
- 16. An emergency oxygen system for an anesthesia system as defined in claim 14 wherein said means to monitor the flow in said bypass conduit comprises a flow meter visually perceptible by the user.
- 17. An emergency oxygen system for an anesthesia system, said system comprising;
- an oxygen conduit for delivering oxygen from a source of oxygen to an outlet,
- a gas conduit for delivering at least one other gas from a source of at least one other gas, said gas conduit having a shut-off valve in said conduit for controlling the flow of gas from said source of said at least one other gas,
- a first proportioning valve in said oxygen conduit and a second proportioning valve in said gas conduit, said proportioning valves adapted to establish a desired proportion of oxygen and said at least one other gas to supply the mixed gas in the desired proportion to said outlet,
- a processor controlling the condition of the proportioning valves to achieve the desired proportion of oxygen and said at least one other gas at said outlet,
- an oxygen flow sensor in said oxygen conduit and a gas flow sensor in said gas conduit downstream, respectively, of said first and second proportioning valves, said processor adapted to monitor the flow sensors to determine that the proportioning valves are providing the desired flows of oxygen and the at least one other gas,
- a bypass conduit for said oxygen conduit and connected so as to allow oxygen to bypass the proportioning valve in said oxygen conduit, a bypass valve having a first condition where the oxygen passes through said first proportioning valve and a second condition wherein said oxygen flows through said bypass conduit around said first proportioning valve, said bypass conduit having a means to control the flow of oxygen in said bypass conduit and further having a means to monitor the flow in said bypass conduit,
- said processor adapted to determine when the flows sensed by said oxygen flow sensor and said gas flow sensor are not within a predetermined range of flows necessary to produce the desired proportion of oxygen and said at least one other gas, said processor thereupon closing said shut off valve and operating said bypass valve to said second condition to divert oxygen around said first proportioning valve to said outlet.
- 18. An emergency oxygen system for an anesthesia system, said system comprising;
- an oxygen conduit adapted to be connected to a source of oxygen for delivering the oxygen to an outlet,
- a gas conduit adapted to be connected to a source of a gas for delivering the gas to an outlet, said gas conduit having a shut-off valve for controlling the flow of gas from the source through said gas conduit,
- a first flow control valve in said oxygen conduit and a second flow control valve in said gas conduit, said flow control valves adapted to establish a desired proportion of oxygen and gas supply a mixture of oxygen and gas to in a desired proportion to said outlet,
- a processor controlling the position of said first and second flow control valves to achieve the desired proportion of oxygen and gas to said outlet,
- an oxygen flow sensor in said oxygen conduit and a gas flow sensor in said gas conduit to monitor the mixture of gases from said first and second control valves to determine that said control valves are providing the desired proportion of oxygen and gas,
- a bypass conduit for said oxygen conduit and connected so as to allow oxygen to bypass the first flow control valve, said bypass conduit having a means to control the flow of gas through said bypass conduit,
- means to close the shut off valve in said gas conduit when said oxygen and gas flow sensor indicates that the proportion of oxygen is not within the desired proportion, and
- alarm means to alert a user that the proportion of oxygen is not of the desired proportion in the mixture of oxygen and gas.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of U.S. Patent application Ser. No. 08/885,412, filed Jun. 30, 1997 now U.S. Pat. No. 5,846,614, by the same inventor.
US Referenced Citations (8)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0361134A3 |
Oct 1990 |
EPX |
2133714 |
Aug 1984 |
GBX |
2230843 |
Oct 1990 |
GBX |