Matburn (holdings) Limited

Patrick Hugh McLeod

Peter J Briggs

Malcolm Charles Ockwell

A filter is provided for a colostomy or ileostomy bag. The filter has a first layer of material which is gas permeable and water impermeable and forms the gas inlet side of the filter, a second layer of material which is gas permeable or is rendered gas permeable by the presence of at least one aperture therethrough. A layer of carbon cloth is sandwiched between the first and second layers, the first and second layers being secured to the carbon cloth by a weld which extends through the periphery of the carbon cloth.

Colostomy or ileastomy applicance

The invention provides a method of making a filter for use in venting a colostomy or ileostomy bag. An assembly comprising a first sheet of a gas permeable and water impermeable material, a second sheet of material which is gas permeable or is rendered gas permeable by the provision of at least one aperture therethrough, and a sheet of carbon cloth between the first and second sheets is fed to a sealing station. In the sealing station the assembly of sheets is sealed together, preferably heat sealed by a weld extending through the periphery of the carbon cloth, to form a filter comprising two pieces of the above mentioned first and second sheets with a piece of the carbon cloth sealed therebetween. The filter is then removed from the remainder of the assembly.

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London, United Kingdom

Patrick Hugh McLeod