| 摘要 |
PCT No. PCT/SE81/00243 Sec. 371 Date Apr. 20, 1982 Sec. 102(e) Date Apr. 20, 1982 PCT Filed Aug. 31, 1981 PCT Pub. No. WO82/00766 PCT Pub. Date Mar. 18, 1982.An anaesthesia-breathing apparatus for supplying gas to a patient for artificial respiration, supported respiration, anaesthesia purposes or combinations of such purposes. The apparatus comprises a gas chamber connected to a patient connection piece, a respiratory gas receptacle, for example in the form of a respiration bag, a first check valve adapted to permit discharge of excess gas from the breathing apparatus to the atmosphere and, optionally a filter for absorption of carbon dioxide from recirculation breathing gas. Security and venting valves are not required for the patient's security during manual operation of the respiration bag because the gas chamber is in communication with the patient connecting piece via a control valve which alternately conducts exhaled gas to one end of a recirculation gas chamber or closes the communication to the recirculation gas chamber and conducts the exhaled gas from the gas chamber to the patient. The recirculation gas chamber, which holds at least the volume of gas exhaled by a mature person that has been in contact with the lung alveoli, is connected at its other end via a second check valve opening towards the respiratory gas receptacle, to the respiratory gas receptacle. A side duct, which is in communication with the atmosphere via the first check valve, is connected to the recirculation gas chamber near the one end, and a connection for supplying fresh gas from a pressurized source opens into the recirculation gas chamber immediately upstream from the second check valve. |
