초록 ▼

A medical dosing device/method for providing small discrete volumes of gas, for example sulfur hexa fluoride or nitric oxide, to the breathing gases of a patient. The device includes a charging valve interposed between a gas supply and a dosing chamber. A discharge valve is connected between the dos

A medical dosing device/method for providing small discrete volumes of gas, for example sulfur hexa fluoride or nitric oxide, to the breathing gases of a patient. The device includes a charging valve interposed between a gas supply and a dosing chamber. A discharge valve is connected between the dosing chamber and an outlet of the device. The dosing chamber has a pressure sensor connected to a control means for the valves. In operation, the control means closes the discharge valve and opens the charging valve until a predetermined pressure is sensed in the dosing chamber. The charging valve is closed and thereafter the discharge valve is opened to supply gas from the dosing chamber until the pressure sensed by the pressure sensor falls to a second, lower level. The discharge valve is then closed. The gas so discharged forms the volume of gas.

대표청구항 ▼

[ I claim:] [1.] A medical dosing device for providing a discrete volume of gas from a pressurized gas supply, said dosing device comprising:a control means;an inlet connectable to the pressurized gas supply;an outlet supplying the volume of gas;a dosing chamber interposed between said inlet of said

[ I claim:] [1.] A medical dosing device for providing a discrete volume of gas from a pressurized gas supply, said dosing device comprising:a control means;an inlet connectable to the pressurized gas supply;an outlet supplying the volume of gas;a dosing chamber interposed between said inlet of said dosing device and said outlet of said dosing device, said dosing chamber having an inlet and an outlet;a charging valve coupled to said inlet of said dosing device and to said inlet of said dosing chamber, said charging valve being operable by said control means, said charging valve admitting gas from the pressurized gas supply to said dosing chamber when open and sealing the inlet of said dosing chamber when closed;a discharge valve coupled to said outlet of said dosing chamber and to said outlet of said dosing device, said discharge valve being operable by said control means, said discharge valve sealing the outlet of said dosing chamber when closed and discharging gas from said dosing chamber to said outlet of said dosing device when open;at least one pressure sensor coupled to said dosing chamber for detecting the pressure in said dosing chamber, said pressure sensor being couplable to the control means;said dosing chamber being charged with gas to a first predetermined pressure which is sensed by said pressure sensor when said discharge valve is closed and said charging valve is open, said discharge valve being opened to supply gas from said dosing chamber to said outlet of said dosing device until the pressure in the dosing chamber drops to a second, lower, predetermined pressure, the gas so supplied forming a discrete volume of gas.