Nitrous oxide anesthetic administration system

摘要

A system and method for administering nitrous oxide to a patient has a fluid control system that allows a user to monitor and control the supply of gases to a patient. A shutoff valve allows a user to selectively activate the fluid control system. Oxygen flow is adjusted by a flow controlling valve. A differential pressure regulator allows flow of nitrous oxide in response to sufficient oxygen flow. Flow of the nitrous oxide is further controlled by a ratio controlling valve. A display shows the flow of the gases through the fluid control system. A flush valve allows a user to flush the output with oxygen. A flow indicator light may be included. An optional output selector allows the user to direct the flow to one of various output ports. An optional safety scavenge valve prevents operation of the fluid control system when there is insufficient scavenge vacuum pressure.

主权项

1. A system for administering nitrous oxide and oxygen, comprising:
a fluid control system for controlling a flow of nitrous oxide and oxygen; a nitrous oxide and oxygen supply fluidly connected to the fluid control system; a vacuum source fluidly connected to the fluid control system; a safety scavenge system connected to the fluid control system, the safety scavenge system comprising: a mass airflow sensor for reading scavenging vacuum pressure fluidly connected to 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 valve when the scavenging vacuum pressure is less than the one or more predetermined ranges; wherein the fluid control system further comprises:
a first intake conduit and a second intake conduit;a shutoff valve on the first intake conduit, selectively moveable between an off position in which it does not permit a fluid to flow past a shutoff point in the first intake conduit and an on position in which it does permit a fluid to flow past a shutoff point in the first intake conduit; a flow controlling valve at a joint between the first intake conduit and a first output conduit, the flow controlling valve allowing the first intake conduit and the first output conduit to be in selective fluid connection; a differential pressure regulator having a first chamber and a second chamber, the first chamber being fluidly connected with the first output conduit, and the second chamber being fluidly connected with the second intake conduit; the second chamber of the differential pressure regulator being selectively fluidly connectable with a second output conduit; the first and second chamber being separated by a wall, the wall being spring biased to a first position in which the second intake conduit is not fluidly connected with the second output conduit, and the wall being displaceable to an open position in which the second intake conduit is fluidly connected with the second output conduit; a ratio controlling valve on the second output conduit; a combined flow conduit having a first end that is fluidly connected with the first output conduit and the second output conduit; and a display unit showing a first flow through the first output conduit, the display unit displaying a second flow through the second output conduit.