Patent ID: 8794233

Claim:
A system for administering nitrous oxide to a patient, comprising: a fluid control system for controlling the flow of nitrous oxide and oxygen; a nasal delivery interface system fluidly connected to the fluid control system; a nitrous oxide and oxygen supply fluidly connected to the control system; a vacuum source fluidly connected to a scavenging tube for scavenging excess gases; the fluid control system includes a safety scavenge system, the safety scavenge system comprising: a mass airflow sensor for reading scavenging vacuum pressure fluidly connected to the scavenging tube before the vacuum source; a master controller in electrical communication with the mass airflow sensor for receiving the scavenging vacuum pressure reading from the mass airflow sensor which is compared to one or more predetermined ranges; and a nitrous oxide valve fluidly connected to the nitrous oxide supply and in electrical communication with the master controller which shuts off the nitrous oxide shut-off valve when the scavenging vacuum pressure is less than the one or more predetermined ranges.