| 摘要 |
A pneumatically controlled pressure relief valve and various systems incorporating a pneumatically controlled pressure relief valve. The valve has a flexible valve closure member which is expandable to close a through passage of the valve and includes a pressure chamber disposed externally of the valve passage and isolated from the through passage by the flexible valve closure member so that the valve may open and close in response to the differential between the pressure in the pressure chamber and the pressure in the through passage of the valve. An input passage opens into the pressure chamber for admitting air and a manually operable valve is provided for opening and closing the input passage to regulate the admission of air. The systems incorporating the valve include an inflatable cuff system for a tracheal or endotracheal tube, a positive end expiratory pressure system and a suction system incorporating a suction catheter.
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