| 摘要 |
A gas-powered resuscitator includes an oscillatory timing valve ( 14 ) having an outlet ( 23 ) connected via a manually-operable valve assembly ( 16, 25 ) to a patient valve ( 41 ). The timing valve ( 14 ) has a sealing rod ( 145 ) movable along a bore ( 141 ) between a forward position in which it blocks flow through the valve and a rear position in which it enables flow through the valve. The rear end ( 151 ) of the rod ( 145 ) is mounted in a piston ( 146 ) and is urged rearwardly to an open position by a spring ( 148 ). A flexible diaphragm ( 149 ) is joined around its edge ( 158 ) to the housing ( 140 ) of the valve, separating the rear end ( 159 ) of the valve from the forward end ( 160 ) and extending over the rear end ( 146 ) of the piston ( 146 ). The control inlet ( 34 ) of the valve ( 14 ) opens into its rear part ( 159 ) so that gas pressure applied to the inlet acts on one side of the diaphragm ( 149 ) to urge the piston ( 146 ) and rod ( 145 ) forwardly to the closed position against the action of the spring ( 148 ). |
