| 摘要 |
<p>1511233 Respiratory valves PNEUPAC Ltd 23 April 1975 [4 June 1974] 24786/74 Heading AST [Also in Division F2] A valve for a lung ventilation apparatus comprises a gas pulse inlet 4a, a patient connection 2 and an exhaust outlet 5a. A piston valve member 7 moves to the right in response to a gas pulse at 4a to open up communication with the patient connection 2 via restrictions 21 in the piston and a port 9 and to close the patient to exhaust connections by contact between the right hand end face of the piston and the face 5b of an end plug 5. The provision of the restriction in the flow path of the gas to the patient produces a pressure differential across the piston which ensures positive action without hunting.</p> |
