| 摘要 |
<p>A continuous positive airway pressure controller (1) for supplying a regulated oxygen/air mix to a respiratory circuit for supplying an enriched oxygen/air mix supply to a subject. The controller (1) comprises a main body member (2) having a main oxygen inlet port (4) for receiving oxygen from a pressurised source, and a main outlet port (5) through which the regulated oxygen/air mix is delivered to the respiratory circuit. A pressure regulator (10) located in an inlet gallery (7) regulates the pressure of oxygen in the controller (1) and supplies oxygen at the regulated pressure to a main gallery (11). A primary supply of oxygen to a main jet (14) is delivered through a primary flow control valve (25) from the main gallery (11). The primary oxygen supply is delivered by the main jet (14) through a venturi tube (16) where the primary oxygen supply is mixed with air for forming the oxygen/air mix drawn in through a venturi accommodating chamber (18). A secondary oxygen supply to the chamber (18) is provided from the main gallery (11) through a secondary flow control valve (28) for facilitating varying the ratio of oxygen to air of the oxygen/air mix. The flow rate of the oxygen/air mix from the main outlet port (5) is controlled by the pressure regulator (10) independently of the ratio of oxygen to air of the oxygen/air mix, which in turn is varied by the secondary flow control valve (28) independently of the flow rate of the oxygen/air mix.</p> |
