Ostomy bag filters

Details Ostomy bag filters Ostomy bag filters

1996-12-31

1997-11-25

Clarke, Robert A.

Surgery

Means and methods for collecting body fluids or waste material

Receptacle attached to or inserted within body to receive...

604327, 604329, 604355, 604349, 128DIG24, A61F 544, A61M 100

Patent

active

056906226

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to ostomy bag flatus filter arrangements and ostomy bags incorporating such arrangements. In particular, the invention relates to ostomy bags having a biodegradable inner bag and a waterproof disposable outer bag.
It is conventional to provide ostomy bags with filters to allow flatus gases to exit from the bag without producing unpleasant smells. Such filters typically take the form of a filter matrix formed from or incorporating an activated charcoal material, for example activated carbon cloth.
A problem with the filter assemblies known heretofore is that the contents of the bag can come into contact with the filter thereby either blocking the filter or gradually permeating into the filter itself.
Various attempts have been made to overcome this problem, but many such attempts have resulted in arrangements of somewhat complex construction which have complicated considerably the manufacture of the ostomy bag.
One known arrangement is disclosed in GB-A-2149306 and involves the provision of an interior barrier wall intended to shield the flatus filter from bodily waste as it enters the ostomy bag from the stomal orifice.
It is an object of the present invention to provide a flatus gas venting system for use with a two-bag ostomy bag arrangement which is simple and introduces minimal additional complexity to the manufacture of the bag.


SUMMARY OF THE INVENTION

Accordingly, in a first aspect, the invention provides a drainage bag for receiving bodily waste, the drainage bag comprising a water-impermeable outer bag; a water-impermeable inner bag enclosed therein; means defining an orifice to enable bodily waste to be received by the inner bag; the outer and inner bags being detachably secured together in the region of the orifice; characterised in that a first opening is provided in a wall of the water-impermeable inner bag, said first opening being covered by a portion of gas-permeable hydrophobic foam material; and a second opening is provided in a wall of the water-impermeable outer bag, the second opening being covered by a flatus filter; the disposition of the first and second openings being such as to allow flatus gases within the inner bag to pass out through the first opening and thence through the second opening to atmosphere.
With the exception of the second opening, the water-impermeable outer bag is otherwise gas-impermeable. As such, it may be formed from a material such as polyvinylchloride (PVC), polyvinyldichloride (PVDC), ethylenevinylalcohol and related materials and combinations thereof.
The inner bag may be formed of a material which is substantially gas-impermeable, or may be formed from a material which has a degree of gas-permeability.
The first opening is preferably located above the orifice through which bodily waste enters the bag.
The hydrophobic gas-permeable foam material can be, for example, a polyurethane foam material, such as the Kyroderm F grade available from Porvair Filtronics Ltd. of Shepperton, UK.
The porosity of the foam and the size of the aperture are preferably chosen so that flow rate of gas through the foam corresponds to the flow rate through the flatus filter in the outer bag wall.
The flatus filter covering the second opening, i.e. in the outer bag wall, is provided with means for deodorising flatus gases passing therethrough. Such deodorising means typically takes the form of an adsorbent carbon or charcoal material which may be in the form of carbon cloth, or in the form of activated charcoal distributed in a gas-permeable foam matrix.
Examples of such filters are disclosed in, for example, GB-A-2215605, GB-A-2202147, GB-A-2149306, and U.S. Pat. No. 4,203,445. Further examples of suitable flatus filters are provided in our earlier Application GB 9313194.4.
By means of the present invention there is provided a flatus gas venting system suitable for use in a two-bag ostomy bag arrangement which overcomes the aforementioned problems of flatus filters becoming blocked and/or waste materials becoming extruded th

REFERENCES:
patent: 4203445 (1980-05-01), Jessup et al.
patent: 4230761 (1980-10-01), Watts
patent: 5015244 (1991-05-01), Cross
patent: 5108382 (1992-04-01), Wright et al.

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