Enclosure ventilation filter
Inventors
Keleny, Lloyd G. • KALAYCI, VELI E. • Hebert, Michael J. • Elsayed, Yehya A • Mulder, David W. • Dallas, Andrew J.
Assignees
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Publication Number
US-12233001-B2
Publication Date
2025-02-25
Expiration Date
Abstract
A filter assembly for an enclosure, particularly for an ostomy bag, is described having an enclosure side, a first layer which is gas permeable, and an adsorbent layer comprising adsorbent particles dispersed in a fine fiber web. The enclosure side of the filter assembly includes an adhesive zone in which adhesive is present having an outer adhesive perimeter and a weld area surrounding at least a portion of the adhesive zone, where the filter assembly is heat-sealable to the enclosure at the weld area. A method of assembly is also described.
Core Innovation
The invention relates to an Adsorbent Breather Filter and a filter assembly for an enclosure, including an ostomy bag. The filter assembly includes an enclosure side and a side opposite from the enclosure side, and it has a first layer that is gas permeable. An adsorbent layer is formed with adsorbent particles comprising activated carbon, and the adsorbent layer contains less than 2% binder material by weight.
The enclosure side of the filter assembly includes an adhesive zone having an outer adhesive perimeter, and a weld area adjacent to at least a portion of the adhesive zone. The filter assembly is heat-sealable to the enclosure at the weld area. Variants include a second gas-permeable but liquid-impermeable barrier layer to control liquid ingress, and flow paths configured for lateral or mixed axial/lateral flow using gas-impermeable barriers.
The disclosure further describes low-profile gas-permeable layers, an adsorbent matrix formed by activated carbon particles dispersed in a fine polymeric fiber web including electrospun polymeric fine fibers, and laminated or encapsulated by microporous films. It also includes reduced binder and microstructure rationale intended to preserve adsorption sites, and reports performance evaluation using activated carbon/fiber matrix media including H2S breakthrough time and pressure drop compared with commercial controls.
Claims Coverage
The provided independent claims cover three main concepts with multiple inventive features: a filter assembly for an enclosure having a gas-permeable first layer, an activated carbon adsorbent layer with less than 2% binder, and an enclosure-side adhesive zone plus an adjacent heat-sealable weld area; a filter assembly variant where the adsorbent particles are dispersed in an electrospun polymeric fine fiber web; and a system using a release liner carrying a plurality of such filter assemblies for heat-sealable attachment to an ostomy bag.
Gas-permeable first layer with activated carbon adsorbent layer under binder limit and enclosure-side adhesive plus heat-sealable weld area
A filter assembly for an enclosure comprising a first layer which is gas permeable; and an adsorbent layer comprising adsorbent particles, wherein the adsorbent particles comprise activated carbon and wherein the adsorbent layer contains less than 2% binder material by weight; with an enclosure side having an adhesive zone having an outer adhesive perimeter and a weld area adjacent to at least a portion of the adhesive zone, where the filter assembly is heat-sealable to the enclosure at the weld area.
Activated carbon dispersed in electrospun polymeric fine fiber web with enclosure-side adhesive zone and heat-sealable weld area
A filter assembly for an enclosure comprising a first layer which is gas permeable; and an adsorbent layer comprising adsorbent particles, the adsorbent layer further comprising the adsorbent particles dispersed in a fine fiber web comprising electrospun polymeric fine fibers; with an enclosure side having an adhesive zone having an outer adhesive perimeter and a weld area adjacent to at least a portion of the adhesive zone, where the filter assembly is heat-sealable to the enclosure at the weld area.
Release liner system with plurality of binder-limited activated carbon filter assemblies heat-sealable to an ostomy bag
A system of filter assemblies for an enclosure and a release liner comprising a release liner; and a plurality of filter assemblies located on the release liner, each filter assembly comprising a first layer which is gas permeable and an adsorbent layer comprising activated carbon adsorbent particles wherein the adsorbent layer contains less than 2% binder material by weight; and wherein the enclosure side of each filter assembly comprises an adhesive zone having an outer adhesive perimeter and a weld area adjacent to at least a portion of the adhesive zone, where the filter assembly is heat-sealable to the ostomy bag at the weld area.
Overall, the independent claims define enclosure ventilation filter assemblies and a system that combine a gas-permeable first layer with an activated carbon adsorbent layer containing less than 2% binder, and an enclosure-side attachment architecture that includes both an adhesive zone and a heat-sealable weld area. A further independent claim requires dispersion of the adsorbent particles in a fine electrospun polymeric fine fiber web, and another independent claim extends the concept to a system in which multiple such filter assemblies are carried on a release liner for heat-sealable attachment to an ostomy bag.
Stated Advantages
Markedly improved H2S breakthrough compared with commercial controls.
Low pressure drop as reported in performance evaluations compared with commercial controls.
Documented Applications
Adsorbent Breather Filter use for ostomy/enclosure ventilation, including heat-sealable attachment to an ostomy bag and an enclosure.
System use in which a release liner carries a plurality of filter assemblies for enclosure/ostomy bag application.
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