Coupling means for fastening disposable ostomy bags and bag system therefore

A re-usable coupling means for securing to the body of a patient a flexible disposable bag for collecting intestinal wastes from an ostomy, comprising

• (a) a retainer plate of a comparatively stiff plastic material, provided with an opening adapted to surround the stoma when the coupling means is positioned around it, and having a gas passage duct connected to a filter for deodorizing flatus, and
• (c) a flexible sealing adhesive member adapted to releasably adhere the retainer plate to skin around the stoma and being permanently connected with the retainer plate.
• which comprises the feature that the gas passage duct is situated in an annular projection protruding from the front of the retainer plate around the opening, said duct, when the bag is positioned correctly on the coupling means, at one hand communicating with the interior of the bag by means of a plurality of gas inlet openings, and at the other hand via the filter communicating with at least one gas outlet opening in the coupling means, and
• wherein
• (i) the gas passage duct is closed to the rear of the retainer plate and situated in a bead protruding form the front of the retainer plate, said bead radially inwardly delimiting the opening of the retainer plate and radially outwardly delimiting an area for receiving an area of the disposable bag provided with a pressure-sensitive adhesive,
• (ii) the gas passage duct communicates by means of a plurality of gas inlet opening, distributed evenly over the perimeter of the bead, with the interior of the bag when the disposable bag is positioned correctly on the retainer plate, and
• (iii) the filter is placed adjacent the rear of the retainer plate such that an inlet opening for gas flowing to the active filter material communicates via a small chamber with the gas passage duct and also such that gas can only flow from the duct through this inlet opening and the active filter material, whereas a discharge path for the gas from the active filter material debouches opposite a part of the adhesive member not secured to the retainer plate.

A disposable bag for collecting intestinal wastes from an ostomy, said bag having an entrance opening for placing around a stoma to collect the wastes and around that entrance opening an area provided with a pressure-sensitive adhesive for adhering the bag to the front of a retainer plate, said bag comprising in combination

• (a) the retainer plate being of a comparatively stiff plastic material, provided with an opening adapted to surround the stoma when the coupling means is positioned around it, and having a gas passage duct closed to the rear of the retainer plate and situated in a bead protruding form its front around the opening, the bead radially inwardly delimiting the opening of the retainer plate and radially outwardly an area for receiving the bag area of pressure-sensitive adhesive, the gas passage duct communicating by means of a plurality of gas inlet openings, distributed evenly over the perimeter of the bead, with the interior of the bag when this is positioned correctly on the retainer plate, a flatus deodorizing filter being placed adjacent the rear of the retainer plate such that an admittance opening for gas flowing to its active filter material communicates via a small chamber with the gas passage duct and also such that gas can only flow from the bag in use to the outer world via the duct, through this admittance opening, through the chamber, through the active filter material and leave the retainer plate through a discharge opening for the gas from the active filter material debouching opposite a part of an adhesive member not secured to the retainer plate, and
• (b) said adhesive member being flexible, sealing and adapted to releasably adhering the retainer plate to the skin around the stoma and being permanently connected with the retainer plate.

An ostomy bag system comprising in combination

• (a) a conventional disposable toilet-flushable inner bag made of laminated material comprising a water-soluble outer layer which is substantially impenetrable for flatus and a waterproof, mechanically weak inner layer,
• (b) a conventional, re-usable outer bag of a waterproof, mechanically strong material,
• (c) the inner bag having an entrance opening for placing around a stoma to collect intestinal wastes, said inner bag around the entrance opening being provided with a pressure-sensitive adhesive for adhering the bag to the front of a retainer plate of a comparatively stiff plastic material, provided with an opening adapted to surround the stoma when the coupling means is positioned around it, and having a gas passage duct closed to the rear of the retainer plate and situated in a bead protruding from its front around the opening, the bead radially inwardly delimiting the opening of the retainer plate and radially outwardly an area for receiving the bag area of pressure-sensitive adhesive, the gas passage duct communicating by means of a plurality of gas inlet openings, distributed evenly over the perimeter of the bead, with the interior of the bag when this is positioned correctly on the retainer plate, a flatus deodorizing filter being placed adjacent the rear of the retainer plate such that an admittance opening for gas flowing to its active filter material communicates via a small chamber with the gas passage duct and also such that gas can only flow from the bag in use to the outer world via the duct, through this admittance opening, through the chamber, through the active filter material and leave the retainer plate through a discharge opening for the gas from the active filter material debouching opposite a part of an adhesive member not secured to the retainer plate,
• (d) said adhesive member being flexible, sealing and adapted to releasably adhering the retainer plate to the skin around the stoma and being permanently connected with the retainer plate, and
• (e) the rear wall of said outer bag being bipartite in such a way that its lower portion extends to a top level which in use borders on the lower part of the area of affixing the sealing adhesive member for the retainer plate, whereas its upper portion is a plate-like portion having a recess extending from its lowermost edge and having a contour in the upper part adapted to engage the upper half of the gap between the retainer plate and the sealing adhesive member, said recess at both sides being delimited by flaps overlapping the lower portion of the rear wall.