초록 ▼

An apparatus for supplying a mixture of oxygen and an anesthetic gas at a predetermined flow rate and mixture ratio. The flow rate and mixture ratio are controlled by means of electrically operated throttle valves, responsive to output signals from an electronic control system, generated in accordan

An apparatus for supplying a mixture of oxygen and an anesthetic gas at a predetermined flow rate and mixture ratio. The flow rate and mixture ratio are controlled by means of electrically operated throttle valves, responsive to output signals from an electronic control system, generated in accordance with data stored in the control system and with input signals applied to the computer from means for sensing the flow rates of the oxygen and anesthetic gas. Desired flow rate and mixture ratio data may be input by using a numeric keyboard, and are digitally displayed.

대표청구항 ▼

An apparatus for supplying a predetermined rate of flow of an anasthetic gas comprising a mixture of a first gas and a second gas, said first and second gases being provided from a first gas source and a second gas source, said apparatus comprising: a first electrically controlled throttle valve cou

An apparatus for supplying a predetermined rate of flow of an anasthetic gas comprising a mixture of a first gas and a second gas, said first and second gases being provided from a first gas source and a second gas source, said apparatus comprising: a first electrically controlled throttle valve coupled to receive said first gas from said first gas source, for producing a controlled flow thereof; a second electrically controlled throttle valve coupled to receive said second gas from said second gas source, for producing a controlled flow thereof; first flowrate sensing means for measuring the rate of flow of said first gas when output from said first electrically controlled throttle valve and for producing electrical signals of digital form indicative of the magnitude of said rate of flow; second flowrate sensing means for measuring the rate of flow of said second gas when output from said second electrically controlled throttle valve and for producing electrical signals of digital form indicative of the magnitude of said rate of flow of the second gas; data input means for generation of digital data to specify a predetermined total rate of flow of said anasthetic gas and to specify a predetermined mixture ratio of said first and second gases; an electronic control system coupled to receive said digital electrical signals from said first flowrate sensing means and from said second flowrate sensing means and to receive said digital data from said data input means, and comprising memory circuit means for storing said digital data from said data input means and digital data processing circuit means for comparing said predetermined total rate of flow of said anasthetic gas and said predetermined mixture ratio of said first and second gases as represented by said stored digital data with an actual total rate of flow of said anasthetic gas and an actual mixture ratio of said first and second gases as represented by said digital electrical signals from said first and second flowrate sensing means and for producing control signals on the basis of said comparison, said control signals being applied to said first and second electrically controlled throttle valves for thereby bringing said actual total rate of flow of anasthetic gas and actual mixture ratio of said first and second gases into coincidence with said predetermined total rate of flow of said anasthetic gas and said predetermined mixture ratio of said first and second gases respectively; electro-optical display means for displaying said predetermined total rate of flow of said anasthetic gas and said predetermined mixture ratio of said first and second gases stored in said memory circuit means; and means for mixing said first and second gases after measurement of the rates of flow thereof by said first and second flowrate sensing means, for thereby providing said anasthetic gas further comprising first and second fixed throttle valves having the outputs thereof coupled to said means for combining the first and second gases; and manually a actuated gas switching means for selectively supplying either (1) said first gas from said first gas source to said first electrically controlled throttle valve and said second gas from said second gas source to said second electrically controlled throttle valve, or (2) said first gas from said first gas source to said first fixed throttle valve and said second gas from said second gas source to said second fixed throttle valve, and further comprising pressure controlled gas switch means located downstream of said second fixed throttle valve and responsive to pressure from said first gas source to allow flow of said second gas past said gas switch means only when the pressure of said first gas source is above a predetermined minimum pressure.