초록 ▼

An apparatus is disclosed for admixing anesthetic with respiratory gas to be supplied to a patient, which comprises a mixing chamber having an inlet for receiving the liquid anesthesia and the respiratory gas, and an outlet for supplying the mixture. A feed line is provided in the inlet for the liqu

An apparatus is disclosed for admixing anesthetic with respiratory gas to be supplied to a patient, which comprises a mixing chamber having an inlet for receiving the liquid anesthesia and the respiratory gas, and an outlet for supplying the mixture. A feed line is provided in the inlet for the liquid anesthesia, with a heat exchanger for equalizing the inlet temperatures of the anesthesia and respiratory gas. Temperature sensors are provided in the inlet and the outlets with a circuit for determining the difference between the temperatures. Without heating of the chamber this difference is proportional to a ratio between the evaporated anesthetic and respiratory gas. With the chamber heated to equate the inlet and outlet temperatures, the amount of heating is proportional to the flow of anesthetic to the chamber.

대표청구항 ▼

An apparatus for admixing a vaporizable liquid with a gas comprising: an insulated housing defining a mixing chamber; an inlet conduit connected to the housing for a flow of gas to said chamber; a liquid feed line in the inlet conduit for supplying liquid to said chamber, said feed line including a

An apparatus for admixing a vaporizable liquid with a gas comprising: an insulated housing defining a mixing chamber; an inlet conduit connected to the housing for a flow of gas to said chamber; a liquid feed line in the inlet conduit for supplying liquid to said chamber, said feed line including a heat exchanger in said conduit for equating an inlet temperature of the liquid with an inlet temperature of the gas in said inlet conduit before the liquid and gas reach said chamber; a first temperature sensor in said inlet downstream of said heat exchanger for sensing the inlet temperature; an outlet conduit connected to said housing for a flow of vaporized liquid plus gas mixture from said housing; a second temperature sensor in said outlet conduit for sensing an outlet temperature of the mixture; liquid supply means connected to said feed line for supplying liquid at a selected liquid flow rate; gas supply means connected to said inlet conduit for supplying gas at a selected gas flow rate; liquid flow setting means connected to said liquid supply means for controlling said selected liquid flow rate to meet a nominal value for the liquid flow; gas flow setting means connected to said gas supply means for controlling said selected gas flow rate to meet a nominal value for the gas flow; and temperature difference circuit means connected to said first and second temperature sensors and connected to said liquid flow setting means for measuring a difference between said inlet and outlet temperatures, which difference is proportional to a ratio between the concentration of evaporated liquid and respiratory gas in the mixture to obtain an actual liquid flow rate for comparison with the nominal value for the liquid flow.