| 摘要 |
1534247 Respiratory apparatus BENDIX CORP 22 March 1977 [29 March 1976] 12031/77 Heading A5T In a breathing apparatus for supplying oxygen-enriched gas to a patient, preferably through a nasal cannula 18, gas is supplied from a pressurised container 14 or 16 to a plenum chamber 82 for storing a fixed quantity of gas and communicating with an outlet passageway 44 through an orifice 120 closed by a diaphragm 116 movable under the control of means 40 sensing pressure changes due to inhalation and exhalation of the patient. Switch 20 is used to select either container 14 or 16 and gas flows through valve 68 operable by plunger 62 carried by spring-loaded diaphragm 54, the gas flowing to chamber 82 through a selected one of orifices 98, 102, 105, 110 of varying size. Gas flows to the patient through hoses 164. 184, 186 and tubes 174, 176. Pressure variations are communicated to sensing means 40 through hoses 158, 180, 182 and tubes 178. 188. |
