Low profile ostomy system with repositionable pouch

Abstract: The low profile ostomy system includes an adhesively securable repositionable pouch that bonds to a body-side mounting wafer. The repositionable pouch is removable from the mounting wafer for repositioning if necessary. In a preferred embodiment of the invention, a resealable tape, which is in the form of a foam tape, is located on the face plate of the pouch and a releasable film, which is backed by a foam tape, is located on a body-side mounting wafer. The face place of the pouch is formed with an extension tab that is accessible before and after the pouch has been secured to the body-side mounting wafer. The extension tab facilitates peeling of the face plate from the body-side mounting wafer during removal of the pouch from the mounting wafer. The foam tape on the body-side mounting wafer and the face plate inhibit formation of wrinkles or kinks at the engagement surfaces of the face plate and body-side mounting wafer when the pouch is removed from the body-side mounting wafer.

Description: This invention is directed to low profile ostomy systems, and more particularly to a novel adhesively coupled ostomy system wherein the adhesive engagement surfaces of the coupling members remain substantially wrinkle-free during removal and repositioning of an ostomy pouch around a stoma and pouch separation can be accomplished without stretching the pouch envelope. When an adhesively securable ostomy pouch of the type shown in European Patent Application Publication 0611122A1 is supported on a mounting wafer that surrounds a stoma, the adhesive connection between a face plate of the pouch and the body-side mounting wafer is generally non-adjustable. In instances where the face plate is not sufficiently concentric with the stoma, it is often desirable to make a further adjustment of the pouch position after it has been adhesively secured to the body-side mounting wafer. However, removal of an adhesively secured pouch from a body-side mounting wafer can cause the face plate and/or the body-side mounting wafer to wrinkle, especially if the adhesive has a high bond attachment. Wrinkles or kinks in the body-side mounting wafer or in the face plate of the pouch are detrimental to the integrity of the seal between the pouch and wafer. Any wrinkles or kinks can provide a path for undesirable leakage of vapor and material when the face plate of the pouch is resecured to the body-side mounting wafer. In addition, it is often necessary to manipulate the pouch by the pouch envelope during removal of the pouch from the body-side mounting wafer. Any stresses or strains on the pouch envelope during removal of an adhesively secured pouch for adjustment purposes can weaken or damage the envelope material which may provide a further avenue of leakage. If adjustment of an adhesively secured pouch envelope is known to be difficult and is known to entail a likely risk of damage or failure of the pouch, there is a strong possibility that pouch adjustment will be discouraged despite discomfort of the user. Such pouches are not likely to be universally acceptable. It is thus desirable to provide an ostomy system with an adhesively secured pouch that permits easy removal and repositioning of the pouch without damaging the pouch envelope, the pouch face plate or the mounting wafer, and without compromising the leak-tight securement of the pouch during such repositioning. It is also desirable to provide a low profile adhesively installed ostomy system wherein the pouch is relatively easy to manipulate during installation and removal. US 5,429,626 discloses an ostomy appliance having a mounting member adapted to be secured to the periostomal skin surfaces of an ostomate. The mounting member includes a relatively rigid mounting plate having a centrally located aperture therethrough. The mounting plate defines a flat, annular flange portion radially extending from the aperture. An ostomy pouch having a stoma inlet portal therein is adhesively secured to the distal face of the flange. OBJECTS AND SUMMARY OF THE INVENTION Among the several objects of the invention may be noted the provision of a novel low profile ostomy system with an adhesively secured ostomy pouch, a novel low profile ostomy system with an adhesively secured ostomy pouch that is repositionable without compromising a leak-tight seal between the pouch and a body-side mounting wafer, a novel low profile adhesively secured ostomy system wherein the face plate of the pouch can be manipulated relative to the body-side mounting wafer to obtain substantially concentric alignment of the face plate with a body-side mounting wafer, and a novel method of providing wrinkle-free securement, removal and resecurement of an ostomy pouch with a body-side mounting wafer. Other objects and features of the invention will be in part apparent and in part pointed out hereinafter. In accordance with the invention, the ostomy system includes a pouch with an adhesively securable face plate that attaches to a body-side mounting wafer. The pouch, which can be closed-end or drainable, is detachable from the body-side mounting wafer for repositioning if necessary. In order to facilitate repositioning or removal of the pouch after it has been adhesively secured to a body-side mounting wafer, a tab is provided on the face plate of the pouch. The tab is manually accessible after the pouch has been secured to the body-wide mounting wafer. Gripping of the tab facilitates peeling of the face plate from the body-side mounting wafer and also facilitates manipulation, positioning and repositioning of the face plate relative to the body-side mounting wafer. Also, since the peeling force is directed through the face plate of the pouch, there is little, if any, stretching of the pouch envelope during removal and repositioning of the pouch. The adhesive coupling means for the ostomy system include a resealable tape and a releasable film, one of which is provided on the pouch and the other of which is provided on the body-side mounting wafer. In the embodiment of the invention, the resealable tape is provided on the pouch and the releasable film is provided on the body-side mounting wafer. The resealable tape on the body-side mounting wafer is in the form of a foam tape, and the releasable film on the body-side mounting wafer is backed by a foam tape as well. The foam tapes on the mounting wafer and the face plate inhibit development of kinks or wrinkles in either the face plate or the mounting wafer during removal and resecurement of the face plate relative to the mounting wafer. Since the foam tape inhibits formation of wrinkles in the face plate and the mounting wafer, the engagement surfaces on the face plate and the mounting wafer are adhesively secured together in leak-tight fashion, even when the pouch is repositioned several times on the body-side mounting wafer. The body-side mounting wafer includes an abdominal engagement adhesive for securing the mounting wafer to an abdominal surface. A peripheral edge of the abdominal adhesive is covered by an annular tape that overlays the edge of the abdominal adhesive. The annular overlay tape has an inside diameter that is large enough to expose a landing area of sufficient size on the releasable film to receive the resealable tape of the pouch face plate. During positioning of the body-side mounting wafer on the abdominal surface, manipulation portions are provided on opposite sides of the annular overlay tape to facilitate positioning of the mounting wafer on the abdominal surface. The ostomy system is thus a low profile adhesive securement arrangement that is not bulky, yet is flexible and non-flimsy to ensure that wrinkles and kinks do not develop at the pouch coupling surfaces. Thus, leaks that can result from wrinkles in engageable adhesively secured pouch coupling surfaces do not develop since securement, removal and resecurement of the ostomy pouch to the body-side mounting wafer is a substantially wrinkle-free operation. The invention also includes a method of providing wrinkle-free securement, removal and resecurement of an adhesive coupling member of an ostomy pouch and a body-side mounting wafer. The method includes providing a landing surface formed of releasable film for the body-side mounting wafer, incorporating within the mounting wafer a layer of foam tape to support the releasable film, providing the face plate of the ostomy pouch with a resealable adhesive coupling for engagement with the releasable film of the body-side mounting wafer, supporting the resealable adhesive with a foam layer and engaging the resealable adhesive of the pouch coupling with the releasable film of the mounting wafer, to permit a detachable coupling of the pouch to the mounting wafer. The invention accordingly comprises the constructions and method hereinafter described, the scope of the invention being indicated in the claims. DESCRIPTION OF THE DRAWINGS In the accompanying drawings, Fig. 1 is a simplified perspective view of an ostomy system incorporating the present invention, prior to adhesive attachment of the ostomy pouch to the body-side mounting wafer; Fig. 2 is a simplified perspective view thereof after the ostomy pouch has been adhesively secured to the body-side mounting wafer; Fig. 3 is an exploded perspective view of the body-side mounting wafer; Fig. 4 is a plan view of the body-side mounting wafer in assembled condition; Fig. 5 is a sectional view taken on the line 5-5 of Fig. 4; Fig. 6 is a simplified exploded perspective view of the ostomy pouch; Fig. 7 is a plan view of the components of the ostomy pouch of Fig. 6 in assembled condition; Fig. 8 is a sectional view taken on the line 8-8 of Fig. 7; Fig. 9 is a sectional view of the ostomy system on an abdominal wall in alignment with a stoma; and Fig. 10 is a view similar to Fig. 9, showing the ostomy pouch partly detached from the body-side mounting wafer prior to repositioning of the pouch against the wafer. Corresponding reference characters indicate corresponding parts throughout the several views of the drawings. DETAILED DESCRIPTION OF THE INVENTION An ostomy system incorporating one embodiment of the invention is generally indicated by the reference number 10 in Fig. 1. The ostomy system 10 includes a pouch 12 and a body-side mounting wafer 14 shown in separated position in Fig. 1. The body-side mounting wafer 14 is adhesively secured to an abdominal surface 100 around a stoma 120. The ostomy pouch 12, which is expandable, is formed of a known envelope 16 of flexible thermoplastic material made in accordance with known techniques in the art of ostomy pouch construction. The pouch material is impermeable to gas and water. The pouch envelope 16 includes a front wall 20 (Fig. 2) that faces away from the abdominal surface 100 and a rear wall 22 (Fig. 1) that confronts the abdominal surface 100. Referring to Fig. 6, the rear wall 22 includes an inside layer 24 of the same material as the front wall 20 and an outside layer 26 of perforated polyethylene flocking to provide a comfortable surface contact between the layer 26 and the abdominal surface 100. As seen in Fig. 6, both the layers 24 and 26 respectively include aligned waste inlet openings 30 and 32. The front and rear walls 20 and 22 of the pouch 12 are joined together by a peripheral thermal weld 34 (Fig. 1). The aligned peripheries of the waste inlet openings 30 and 32 in the layers 24 and 26 are sealed together in any suitable known manner, such as thermal welding. The pouch envelope 16 further includes a top portion 36 with rounded corners, opposite side portions 38 and 40 that are substantially parallel, and a curved bottom portion 42 that merges into the opposite side portions 38 and 40. The pouch envelope 16 thus defines a waste collection chamber 46 (Fig. 8) accessible through the aligned waste inlet openings 30 and 32 of the rear wall 22. For purposes of simplicity, the reference number 32 will be used hereinafter to indicate the waste inlet opening of the pouch envelope 16. The waste inlet opening 32 has a diameter of approximately 44mm (1-3/4 inches) and is located nearer the top portion 36 of the pouch envelope than the bottom portion 42. The pouch 12 further includes a generally annular adhesive face plate 50 that borders the waste inlet opening 32 and is attached to the rear wall 22 by an annular thermoweld 52 (Fig. 9). The face plate 50 includes a tab 54 projecting beyond a circular periphery 56 of the face plate 50 at an angle of approximately 50° to 60° from the vertical. The face plate 50 is preferably formed of a resealable foam tape 60, such as the type manufactured by the 3M Company of Minneapolis, Minnesota and designated No. 9776 Foam Medical Tape On Liner. The resealable foam tape 60 includes a closed cell polyethylene foam backing approximately .08 mm thick with a hypoallergenic pressure-sensitive acrylate adhesive 62 and a silicone release paper 64. The face plate 50 has an inner diameter of approximately 44mm (1-3/4 inches), substantially identical to the inner diameter of the waste inlet opening 32, and an outer diameter of approximately 3-3/8 inches. The tab portion 54 of the face plate 50 includes a film layer 66 (Fig. 8) laminated to the acrylic adhesive 62 of the tab 54. Preferably the film layer 66 is plasticized, flexible polyvinylchloride sheet material 0,25 to 2.0mm (.010 to .080 inches) thick, with an outside surface that is non-adhesive to ensure that the tab portion 54 is accessible for manual gripping. The film layer 66 thus reinforces the tab 54 and permits manipulation of the tab 54 without adhesive entanglement. As most clearly shown in Figs. 8-10, the surface 68 of the tab portion that confronts the rear wall 22 of the pouch 16 is non-adhesive and is not joined to the rear wall 22 to further ensure that the tab portion 54 is accessible for manual gripping and manipulation. It has been found that the foam tape 60 for the face plate 50 allows substantially wrinkle-free bending or flexion of the face plate 50. Thus, during peeling of the adhesive attachment of the face plate 50 from the mounting wafer 14 during removal of the pouch 12 from the mounting wafer 14, there are no residual wrinkles or kinks in the adhesive engagement surface 62 of the face plate 50. The film layer 66 on the tab portion 54 reinforces the tab and helps prevent the tab 54 from stretching during peeling of the face plate 50 from the body-side mounting wafer 14. Manipulation or pulling of the tab 54 during removal of the face plate 50 from the mounting wafer 14 permits the peeling force to be directed through the face plate 50, rather than the walls 20 and 22 of the pouch. As an alternative to using the film layer 66 on the tab 54, the tab 54 can be formed with sufficient elongation to permit doubling over of the tab on itself after the silicone release paper 64 is removed. The doubling over of the tab 54 upon itself will provide reinforcement to the tab and cover the acrylic adhesive 62 on the tab surface. Alternatively, the face plate 50 can be adhered rather than heat-welded to the pouch wall 22, as by applying pressure-sensitive adhesive to the pouch-confronting side of the face plate 50 to permit an adhesive bond between the face plate 50 and the rear wall 22. Two of the film layers 66 can then be provided on both sides of the tab 54 to cover the adhesive layers on both sides of the tab 54, thereby assuring access of the tab to manual gripping. The body-side mounting wafer 14 is a generally circular arrangement with a central opening 80 of approximately 19mm (3/4 inches) and an outside diameter of approximately 102mm (4 inches). The body-side mounting wafer 14 is thus sized to extend beyond the periphery of the annular face plate 50, as most clearly shown in Fig. 9. Referring to Fig. 3, the body-side mounting wafer 14 includes an annular abdominal adhesive layer 70 covered on both sides with removable layers of silicone release paper 72 and 74 that are removed when the layer 70 is installed on the abdominal surface 100. The layers 72 and 74 are substantially identical in inner and outer diameter to the layer 70. The abdominal adhesive layer 70 is preferably formed of a hydrocolloid adhesive, approximately 0.78 to 2.0 mm (0.030 to 0.080 inches) thick, such as the type sold under the trademark Stomahesive® or Durahesive® by Bristol-Myers Squibb Company of New York, New York. A composite 76, also substantially identical in inner and outer diameter to the abdominal adhesive layer 70, is in the form of a resealable foam tape of the type manufactured by the 3M Company of Minneapolis, Minnesota under the designation 3M Closed Cell Foam 1773. The tape 76 includes a closed cell polyethylene foam backing 78 approximately 0.8 mm thick with a layer 79 of hypoallergenic pressure-sensitive acrylate adhesive that is covered by a layer of silicone release paper similar to the layers 72 and 74. The silicone release paper layers such as 74 are removed prior to assembly of the mounting wafer 14. A layer 84 of polyethylene release film, which is preferably of the type manufactured by the 3M Company of Minneapolis, Minnesota under the designation 3M MSX-1198 Clear PE Release Film, is laminated to the back of the foam tape 76. The opposite surface 86 (Fig. 5) of the release film 84 constitutes a releasable surface-landing area for the resealable adhesive 62 of the annular face plate 50. The body-side mounting wafer 14 further includes a collar 90 formed of Fasson material having an adhesive coating 92 and a soft, perforated non-adhesive backing 94. A silicone release collar 96 (Fig. 3) for the adhesive coating 92 has preformed cut lines 102 and 104 (Fig. 4) that define opposite manipulation segments 106 and 108 and a median section 110. For purposes of simplicity the reference numbers 106, 108 and 110 can also be used to define the corresponding underlying adhesive segments and sections of the collar 90. As most clearly shown in Fig. 10, the collar 90 is sized with an inside diameter that is smaller than the outside diameter of the mounting wafer components 70, 76 and 84. For example, the outside diameter of the Fasson collar 90 is approximately 133mm (5-1/4 inches) and the inside diameter approximately 89mm (3-1/2 inches), such that the Fasson collar 90 overlays the periphery of the mounting wafer components 70, 76 and 84, but exposes a substantial portion of the release film-landing area 86 for adhesive engagement with the annular face plate 50 of the pouch 12. As most clearly shown in Fig. 5, the mounting wafer 14, as assembled for securement to the abdominal surface 100, includes the adhesive layer 70 covered with the removable silicone release layer 72 and backed by the foam tape 76, which is further backed by the release film layer 84. The assembled body-side mounting wafer 14 also includes the Fasson collar 90 secured to the periphery of the release film layer 84, as most clearly shown in Fig. 5. The adhesive surface 92 of the Fasson collar 82 that extends radially beyond the mounting wafer components 70, 76 and 84 is covered by the silicone release paper 96. In using the ostomy system 10, the body-side mounting wafer 14 is first joined to the abdominal surface 100. Prior to securement of the body-side mounting wafer 14 to the abdominal surface 100, the silicone release paper 72 is removed from the abdominal adhesive layer 70 and the median section 110 of release paper 96 is removed from the Fasson collar 90. Release paper 96 remains at the opposite manipulation edge portions 106 and 108 of the Fasson collar 90. The mounting wafer 14 can then be handled by the manipulation portions 106 and 108, to locate the body-side mounting wafer opening 80, in alignment with a stoma 120. The body-side mounting wafer 14 is secured to the abdominal surface 100 by the abdominal adhesive layer 70 and the median section 110 of the Fasson collar 90. The silicone release paper 96 still covers the manipulation portions 106 and 108 of the Fasson collar 90. Once the mounting wafer 14 is in a secured position around the stoma 120 by the abdominal adhesive layer 70 and the median section 110 of the Fasson collar 90, the remaining release paper 96 can be removed from the manipulation sections 106 and 108. The full annular adhesive layer 92 of the Fasson collar 90 that projects beyond the periphery of the mounting wafer components 70, 76 and 84 thus attaches to the abdominal surface, thereby covering any otherwise exposed edges of the abdominal adhesive layer 70. With the body-side mounting wafer 14 satisfactorily secured to the abdominal surface 100, the pouch 12 can then be secured to the body-side mounting wafer 14. The silicone release paper 64 covering the annular face plate 50 of the pouch 12 is then removed to expose the adhesive surface 62 of the face plate. The face plate 50 can be grasped at the tab portion 54 to facilitate manipulation of the face plate 50 against the release film-landing area 86 of the body-side mounting wafer 14. The tab portion 54 helps indicate the location of the waste inlet opening 32 of the pouch 12 and thus simplifies alignment of the waste inlet opening 32 with the mounting wafer 14 and the stoma 120. Once the pouch 12 is secured via the faceplate 50 to the mounting wafer 14, it may be desirable to adjust or reposition the pouch 12 against the mounting wafer 14. The tab portion 54 of the face plate 50 is accessible for manual grasping, as shown in Fig. 10, to peel the annular face plate 50 from the release film 84 of the body-side mounting wafer 14. The releasable qualities of the film 84 facilitate removal of the face plate 50 from the mounting wafer 14. Resecurement of the annular face plate 50 to the release film 84 of the body-side mounting wafer 14 is then accomplished in a manner similar to that previously described. The resealable qualities of the adhesive surface 62 facilitate resecurement of the face plate 50 to the mounting wafer 14. The foam tape 60 of the annular face plate 50 and the foam tape 76 of the body-side mounting wafer 14 help ensure that the peeling of the annular face plate 50 from the body-side mounting wafer 14 is accomplished without any kinking or wrinkling of the respective engagement surfaces, including the release film 84. Thus, resecurement of the face plate 50 to the mounting wafer 14 is a smooth, surface-to-surface engagement with no residual wrinkles or kinks. Under this arrangement, a substantially leak-tight adhesive joint is provided by the adhesive coupling between the mounting wafer 14 and the annular face plate 50, even when a repositioning of the pouch 12 is performed. Some advantages of the present invention evident from the foregoing description include a low profile repositionable ostomy pouch that is easy to manipulate. A further advantage is that the tab portion of the face plate helps manipulate securement of the face plate to the body-side mounting wafer and also serves as an approximate indicator of alignment between the face plate and the body-side mounting wafer. The use of foam layers as constituents of the body-side mounting wafer and the annular face plate provides wrinkle-resistant qualities to the face plate and the body-side mounting wafer, while maintaining a low profile characteristic for the coupling arrangement between the pouch and the mounting wafer. The ostomy system permits reliable leak-tight securement of the pouch, even when the face plate is resecured to the mounting wafer, should readjustment of the pouch relative to the mounting wafer be desirable. In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained. As various changes can be made in the above constructions and method without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Claims: An ostomy pouch (12) comprising: a) a pouch envelope (16) formed of flexible plastic material defining a waste collection chamber (46) for body waste that passes through a stoma (120), b) a waste inlet opening (32) formed in said envelope for positioning around said stoma to permit passage of waste material from said stoma to said collection chamber, and c) flexible annular pouch coupling means (50) on said pouch envelope (16) at said waste inlet opening (32), said pouch coupling means (50) having a resealable coupling adhesive (62) and support means for the resealable adhesive for avoiding wrinkling of said resealable coupling adhesive when said pouch coupling means (50) is flexed or separated from a coupling bond with a body-side mounting wafer (14) as according to one of claims 3, 4, said support means including a polyethylene foam layer (60) joined to an outside surface of said pouch envelope (16). The ostomy pouch as claimed in claim 1, wherein a manipulation tab (54) extends from a generally circular peripheral portion of said pouch coupling means (50) to manipulate securement and removal of said pouch coupling means (50) with respect to a body-side mounting wafer (14), said tab (54) being integral with said polyethylene foam layer (60) and freely moveable with respect to said pouch envelope (16). A body-side mounting wafer (14) comprising a multi-layer assembly having an opening (80) for a stoma, said multi-layer assembly having a biocompatible adhesive layer (70) on one side for securement to a body surface (100) around the stoma, and an opposite side with a release film (84) for detachable engagement with a resealable coupling adhesive of a pouch coupling means (50) as according to one of claims 1, 2 to permit repeated separation of the body-side mounting wafer (14) and the pouch coupling means (50), said multi-layer assembly further including support means for said releasable film for avoiding wrinkling of said releasable film when said releasable film is flexed or is separated from a coupling bond with the pouch coupling means (50), said support means including a layer of polyethylene close cell foam (76) of predetermined thickness. The wafer as claimed in claim 3, wherein said polyethylene foam layer (76) is disposed between said biocompatible adhesive layer and said releasable film of said mounting wafer.

Inventors: KUCZYNSKI THOMAS J, KUCZYNSKI, THOMAS J.
Applicants: SQUIBB BRISTOL MYERS CO, BRISTOL-MYERS SQUIBB COMPANY
Application year: 1997
Main classification: A61F5
IPC codes: A61F5