Surgery – Means and methods for collecting body fluids or waste material – Material collector or receptacle having attaching means to...
Patent
1999-10-07
2000-10-24
Kennedy, Sharon
Surgery
Means and methods for collecting body fluids or waste material
Material collector or receptacle having attaching means to...
604324, 604333, A61M 100
Patent
active
061359866
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an ostomy appliance comprising a deodorising filter, in particular ostomy bags, to a filter device and the use of a hydrophobic and oleophobic membrane for covering the inlet opening of deodorising filters especially for ostomy equipment in particular ostomy bags.
BACKGROUND OF THE INVENTION
In connection with surgery for a number of diseases in the gastrointestinal tract a consequence is, in many cases, that the patient is left with an abdominal stoma such as a colostomy, an ileostomy or an urostomy in the abdominal wall for the discharge of visceral contents. The discharge of viseral contents including intestinal gases cannot be regulated at will, and for that purpose the intestinal opening may be closed with a closure means, e.g. a tampon or a magnetic closure, or the patient will have to rely on an appliance to collect the material emerging from such opening in a bag which is later emptied and/or discarded at suitable times.
The discharge of flatus, measured in volume, may exceed the discharge of solid and liquid faecal matter by many hundred percent and therefore there is usually the need for the continuous or frequent venting of the intestine or the collecting bag. Normally the outflowing flatus is deodorised with a suitable filter. Commonly the active filter is powdered active carbon, which absorbs H.sub.2 S being the principal component of the smell of flatus.
Various constructions of filters for ostomy appliances are known. In the state of the art, the filters are designed so as to obtain a high security of deodorisation of the flatus by insuring that there is no by-pass by which the flatus may circumvent the filter, and some measures have been discussed with respect to obtaining a better security against blocking of the inlet of the filter by solid discharged visceral content. When the inlet opening of the filter is blocked, the gas discharged into the ostomy appliance will lead to ballooning of the bag which is highly undesirable for several reasons. Ballooning will be embarrassing for the user as the bag will bulge and there is an increased risk of leakage which is unacceptable for the user. Another problem may arise when applying a fresh ostomy appliance as a vacuum in the bag may give a "pancaking" effect, i.e., the front wall and the rear wall stick together and are very difficult to separate which may hamper the discharge of visceral contents into the bag.
Examples of filters are described in U.S. Pat. Nos. 3,804,091, 3,952,727 and 3,759,260 wherein activated carbon particles are present in a filter body of matted fibres and wherein the filter body is arranged such that the flatus passes therethrough in various ways. However, it is a drawback of the filters known from these specifications that there is no firm surface connection between the filter body and the plastic, gas impermeable cover sheets therefor whereby a flow of gases may occur through the filter without passing through the filter body and hence without being deodorised. This for instance may take place as a result of bending or bowing the filter consequent e.g. upon the patient bending, which can cause small interspaces or channels to be formed between the filter body and one of the walls.
U.S. Pat. No. 4,490,145 discloses an ostomy pouch with a deodorising filter. The filter consists of a filter element affixed to the outside or inside of the pouch outer wall and comprising a polymeric film cover attached to the said pouch wall, and an insert of a gas deodorising material, e.g. of one of the kinds mentioned above. The pouch wall has an aperture providing entry to the filter element and the polymeric film cover has an aperture for venting the deodorised gas to the atmosphere. The two apertures are spaced from each other in order to let the intestinal gas pass through the length of the insert of deodorising material. U.S. Pat. No. 4,490,145 does not disclose a positive sealing connection between the film cover for the filter element and the insert of deodorising materia
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Leisner Henrik
Olsen Eskil Hoijland
Coloplast A/S
Kennedy Sharon
Simmons Kevin C.
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