| 摘要 |
1,165,542. Artificial respiration apparatus. CHIRANA ZAVODY ZORAVOTNICKEJ TECHNIKY OBOROVY PODNIK. 26 Sept., 1966 [27 Sept., 1965], No. 42831/66. Heading A5T. Artificial respiration apparatus comprises a mixing chamber 17 connected by a' conduit 18 to a source of pressurised respiratory gas and through a pneumatic resistance 19 to atmosphere, a conduit 5 connecting the mixing chamber to .the communication chamber 3 of a diaphragm-operated valve 21, a respiratory mask 9 communicating with the mixing chamber and the conduit 5 and a conduit 10 connecting the control chamber 2 of the valve 21 with either the mixing chamber 17 or the gas supply .conduit 18, the diaphragm 1 of the valve 21 being movable, by pressure differentials between the conduit 5 and the control chamber 2 of the valve, into a position in contact with a seat 20 to close the conduit 5 from the communication chamber 3 for inhalation or a position spaced from the seat 20 to open the conduit 5 to atmosphere via the communication chamber for exhalation. Pressurised gas is supplied to the mixing chamber through a nozzle 8, atmospheric air being drawn into the mixing chamber through a pneumatic resistor 19 and the mixture being ejected through a nozzle 7. With the diaphragm in contact with the seat 20, the mixture passes to the mask 9 to induce inhalation when a predetermined maximum pressure is reached in the conduit 5, the diaphragm moves away from the seat 20 and the mixture ejected through the nozzle 7 passes through the conduit 5, communication chamber 3 and an adjustable pneumatic resistor 16 to atmosphere and draws gas from the mask and lungs to induce exhalation. In a modification, the control chamber (2a Figure 2) of the diaphragm-operated valve (21a) is controlled by two additional diaphragm-operated valves (21b, 21c) in response to pressures in the conduit (5a) which is connected by a conduit (13) with the control chamber (2b) of one additional valve. The additional valves are connected in branches of the conduit 10 and are changed over in response to pressures in the conduit (5a) to assist in terminating the inhalation and exhalation phases of the apparatus. If the patient makes a spontaneous inhalation, the change in pressure in the conduit 5, (5a) causes the diaphragm to be maintained in, or change over to, the inhalation position. |
