OSTOMY APPLIANCE

摘要

An ostomy pouch (10) is described having an automatic pressure relief valv e (82) which opens and closes automatically in response to the differential ga s pressure across the valve to vent flatus. In one form, the valve comprises a diaphrag m which seals against a seat by the use of a tacky gel or oil. The diaphragm is pinched towards one side and flexes as a flap. In one preferred form, the valve (84) is used in combination with a deodorising filter (82). The filter may be mounted co-axially with the valve, or it may be mounted separately and offset from the valve. A sub-envelope assembly (80) is described carrying the valve (84) and the filter (82) and defining a buffer volume between the valve and filter to compensate for the different flow characteristics of the valve and filter.