Ostomy bag with filter combination
First Claim
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1. A bag for receiving waste discharge from the human body comprising:
- front and rear walls formed of polymeric material, said walls having edges sealed together, said rear wall having a stomal aperture;
a filter attached to one of the walls over a gas venting opening in the wall through which filtered gases exit the bag; and
an intervening membrane located between the front and rear walls of the bag disposed between said stomal opening and said filter, said intervening membrane including a thermoplastic film sealable to said walls, said film being secured to at least one surface of a liquid impermeable, gas permeable sheet of microporous polytetrafluoroethylene having pore sizes from 1 to 6 microns, said intervening membrane having a gas flow rate of at least 100 cubic centimeters per centimeter squared per minute at at least 6 centimeters of water pressure.
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Abstract
An ostomy bag having a stomal aperture to receive a stoma in one wall of the bag and a gas venting aperture in the bag with a filter element covering the gas venting aperture, the bag including an intervening membrane disposed between the front rear walls of the bag and between the stomal aperture and the gas venting aperture. The intervening membrane is liquid impermeable and gas permeable and supports an adequate flow rate of gas for ostomy bag applications. The intervening membrane preferably comprises a polytetrafloroethylene, microporous semi-permeable membrane laminated to a thermoplastic film layer which is heat sealable to the walls of the bag.
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Citations
7 Claims
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1. A bag for receiving waste discharge from the human body comprising:
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front and rear walls formed of polymeric material, said walls having edges sealed together, said rear wall having a stomal aperture;
a filter attached to one of the walls over a gas venting opening in the wall through which filtered gases exit the bag; andan intervening membrane located between the front and rear walls of the bag disposed between said stomal opening and said filter, said intervening membrane including a thermoplastic film sealable to said walls, said film being secured to at least one surface of a liquid impermeable, gas permeable sheet of microporous polytetrafluoroethylene having pore sizes from 1 to 6 microns, said intervening membrane having a gas flow rate of at least 100 cubic centimeters per centimeter squared per minute at at least 6 centimeters of water pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification