| 摘要 |
<p>Valve apparatus for use in connection with a respirator or like apparatus, suitable for use in resuscitation, the valve apparatus providing a stepless or continuous adjustment of the counter-pressure presented to expiration by the patient. The apparatus includes a rear portion having an opening formed therein which provides a fluid inlet into the interior space of the rear portion for an inhalation, such as air or oxygen and atomized drugs from a respirator or the like, a diaphragm valve member associated with the rear portion which opens to allow the passage of the inhalation from within the rear member but which closes during expiration to prevent the passage of exhalation into the interior of the rear member, a front portion associated with the rear portion in a manner such that the diaphragm valve member is interposed between the interior spaces of the front and rear portions, the front portion having an aperture which provides fluid communication between the interior of the front portion and the external atmosphere and an adjustment ring mounted around the first portion for rotation with respect thereto, the adjustment ring having an aperture formed therein adapted to be moved into overlapping relationship with the aperture formed in the first portion to change the effective size of the front portion aperture. In this manner, a stepless or continuous adjustment of the counter-pressure presented to expiration is achieved.</p> |
