| 摘要 |
A gas-powered ventilator has a patient valve assembly 2 with a housing 20 containing a duck-bill valve element 60 arranged to allow gas to flow from the ventilator 1 to the patient during inhalation. The valve element 60 closes during exhalation, diverting the exhaled gas to exhaust ports 30 in the housing 20 and substantially preventing exhaled gas flowing back to the ventilator. The valve housing 20 also contains a filter 50 between the valve element 60 and the patient outlet 5 so that all gas flowing to and from the patient passes through the filter and the ventilator is thereby protected from contamination from any gas that might seep back through the valve element. The valve assembly 2 is removable from the ventilator 1 as a single unit so that it can be disposed of and replaced between patients. |
