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A system for delivering a therapeutic amount of nitric oxide can include a reservoir including a restrictor with a length of at least 0.5 inch and at most 2 inches covered by a metal sheath, a gas supply, and a delivery conduit. A delivery conduit can include at least one cartridge and a patient int

A system for delivering a therapeutic amount of nitric oxide can include a reservoir including a restrictor with a length of at least 0.5 inch and at most 2 inches covered by a metal sheath, a gas supply, and a delivery conduit. A delivery conduit can include at least one cartridge and a patient interface. The at least one cartridge can include a surface-active material and a reducing agent.

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1. A system for delivering a therapeutic amount of nitric oxide, comprising: a reservoir assembly including a reservoir including a restrictor covered by a metal sheath and a heating element, wherein the restrictor includes a first end and a second end, wherein the first end of the restrictor is cou

1. A system for delivering a therapeutic amount of nitric oxide, comprising: a reservoir assembly including a reservoir including a restrictor covered by a metal sheath and a heating element, wherein the restrictor includes a first end and a second end, wherein the first end of the restrictor is coupled to the reservoir;a permeation tube, wherein the permeation tube is connected to the reservoir assembly outside of the reservoir assembly;a gas supply; anda delivery conduit for delivering a therapeutic amount of nitric oxide including at least one cartridge, wherein the at least one cartridge comprises a surface-active material and a reducing agent, anda patient interface. 2. The system of claim 1, wherein the restrictor includes an orifice. 3. The system of claim 1, wherein the restrictor includes a tube. 4. The system of claim 3, wherein the tube is a capillary tube. 5. The system of claim 1, wherein the second end of the restrictor is coupled to the delivery conduit. 6. The system of claim 1, wherein the delivery conduit includes an inlet and an outlet. 7. The system of claim 6, wherein the gas supply is coupled to the inlet of the delivery conduit. 8. The system of claim 6, wherein the patient interface is coupled to the outlet of the delivery conduit. 9. The system of claim 1, wherein the gas supply is coupled to the delivery conduit. 10. The system of claim 1, wherein the reservoir includes a nitrogen dioxide source. 11. The system of claim 10, wherein the nitrogen dioxide source includes liquid dinitrogen tetroxide. 12. The system of claim 1, wherein the gas supply is an air supply. 13. The system of claim 12, wherein the air supply is an air pump. 14. The system of claim 13, wherein the air pump is battery powered. 15. The system of claim 1, wherein the gas supply is coupled to an inlet of the delivery conduit and wherein the second end of the restrictor is coupled to the delivery conduit. 16. The system of claim 1, wherein the reservoir, the restrictor and the cartridge form a disposable module that is capable of being removed from the system. 17. The system of claim 1, wherein the system also includes at least one of a nitric oxide sensor, a nitrogen dioxide sensor, a flow sensor, a pressure sensor and a sensor for atmospheric pressure. 18. The system of claim 1, wherein the system has a weight of less than 32 ounces. 19. The system of claim 18, wherein the system has a weight of less then 16 ounces. 20. A method of delivering nitric oxide comprising: heating a reservoir assembly including a reservoir including a restrictor, wherein the restrictor is coupled to the reservoir,releasing nitrogen dioxide from the reservoir assembly via the restrictor into a permeation tube,passing the nitrogen dioxide from the permeation tube into a delivery conduit;passing, a gas from a gas supply into the delivery conduit which allows the gas from the gas supply and the nitrogen dioxide to mix in the delivery conduit;passing the gas and nitrogen dioxide mixture through at least one cartridge, wherein the cartridge comprises a surface-active and a reducing agent; anddelivering nitric oxide from an outlet of the delivery conduit. 21. The method of claim 20, wherein the restrictor includes a first end and a second end, wherein the first end of the restrictor is coupled to the reservoir and wherein the second end of the restrictor is coupled to the delivery conduit. 22. The method of claim 20, further comprising attaching a disposable module including the reservoir, the restrictor and a first cartridge to a base unit.