(19)
(11)EP 3 175 829 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
06.05.2020 Bulletin 2020/19

(21)Application number: 16205737.6

(22)Date of filing:  12.11.2009
(51)International Patent Classification (IPC): 
A61F 5/445(2006.01)
A61F 5/448(2006.01)

(54)

TO CONTROL BENDING IN A SKIN PLATE FOR USE IN AN OSTOMY APPLIANCE

KONTROLLE VON BIEGUNG IN EINER HAUTPLATTE ZUR VERWENDUNG IN EINER OSTOMIEVORRICHTUNG

PROCÉDÉ POUR CONTRÔLER LE DEGRÉ DE COURBURE D'UN PANSEMENT CUTANÉ DESTINÉ À ÊTRE UTILISÉ DANS UN DISPOSITIF DE STOMIE


(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

(30)Priority: 12.11.2008 DK 200801571

(43)Date of publication of application:
07.06.2017 Bulletin 2017/23

(62)Application number of the earlier application in accordance with Art. 76 EPC:
15179512.7 / 2974702
09756662.4 / 2370030

(73)Proprietor: Coloplast A/S
3050 Humlebaek (DK)

(72)Inventors:
  • ANDERSEN, Birthe Vestbo
    3060 Espergaerde (DK)
  • HANSEN, Michael
    3250 Gilleleje (DK)


(56)References cited: : 
JP-A- H11 290 364
US-A- 4 723 952
US-A- 2 675 001
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    TECHNICAL FIELD



    [0001] The invention relates to a skin plate for use in an ostomy appliance, wherein the bending of the skin plate occurs at desired areas. In particular, a convex shell is described having a higher flexibility around a first axis which is perpendicular to the centre axis of the through-going hole relative to the flexibility around a second axis having an angle to the first axis and being perpendicular to the centre axis of the through-going hole.

    BACKGROUND



    [0002] Skin plates, also called base plates, are used in ostomy appliances to attach ostomy bags to the skin of a user having a stoma, the user also being referred to as an ostomate.

    [0003] The skin plate is typically formed by a backing layer, e.g. a polyurethane film, on which a skin friendly adhesive is disposed. A through-going hole is arranged in the skin plate to receive a stoma so that the skin plate may be adhered to the skin surrounding the stoma.

    [0004] In order to collect output from the stoma, the opening of an ostomy bag is arranged around the through-going hole. The ostomy bag may for example be arranged by welding the bag to the backing layer of the skin plate. This is in the art referred to as a one-piece ostomy appliance. Alternatively, a coupling arrangement, either adhesively or mechanically may be arranged so that ostomy bags may be arranged detachably on the skin plate. This allows the bag to be changed when full without detaching the skin plate from the skin. In the art, this is referred to as a two-piece ostomy appliance.

    [0005] A number of ostomates develop so-called sunken/retracted stomas. This is where a stoma sinks into the abdomen which creates a recess in the stomach where the stoma is placed. Applying a planar skin plate around such a stoma would for one thing leave the area around the stoma uncovered and thereby, exposed to the output from the stoma. Moreover, in some cases the stoma is retracted so much that it is not even possible for it to extend through the through-going hole in the skin plate. In order to address the issue of sunken stoma convex skin plates has been developed.

    [0006] These have a convex surface contour where an outer planar area is adhered to an outer skin area which surrounds the stoma, but where the skin is not pulled inwards towards the stoma.

    [0007] An intermediate area of the convex surface, having a slanting surface along the axis of the through-going hole, adheres to the skin area between the outer skin area and the inner skin area described hereafter. Finally, an inner planar area of the convex surface is adhered to an inner skin area which immediately surrounds the stoma.

    [0008] Typically and described in general, such convex skin plates are manufactured by forming a planar skin plate as described above to a convex shell. The convex shell has the desired contour and shape and is formed in a material which is more rigid than the planar skin plate.

    [0009] The planar skin plate is pressed to the shape of the convex shell thereafter they are joined together, typically by welding or adhesive.

    [0010] Thus, by choosing a suitable shell having a contour and shape which fit the characteristics of the sunken stoma, an ostomy appliance may be provided which snugly fits around the stoma, reducing the risk that output from the stoma gets in contact with the surrounding skin.

    [0011] It has shown that the tissue surrounding such sunken stoma in some cases, in particular when relating to overweight and obese people, collapses around the convex skin plate. During such collapse, there is a risk the skin plate is dislodged or that the skin plate folds across the stoma and closes off the function of the stoma.

    [0012] Furthermore, during activity the movement of the body causes constant bending around with the risk of creating pressure ulcers.

    [0013] US2675001 is considered to represent the closest prior art, it discloses a colostomy device with a disc forming part of connecting means between a collecting bag and the body of a patient. The disc includes an outer ring and an inner ring joined by radial spokes. The disc is convex outwardly relatively to the bag, and the spokes provide relatively large perforations between the inner and the outer ring.

    [0014] JP H11 290364 discloses an excrement collecting device for attachment around a stoma. The device includes a circular ring skin contacting part having a ring-shaped protrusion and a number of radially extending protrusions formed around an opening in the circular ring. The device is useful in facilitating attachment and detachment of a collecting bag to a skin portion of the collecting device.

    [0015] US4723952 discloses an ostomy device comprising a rigid frame having an opening which is registered with the stoma of a user and secured on the user's torso by an elastic belt. The frame can include an insert formed with a planar central portion surrounding an opening, and a curved outer flange and additionally provided with arcuate openings concentrically around the opening.

    [0016] As will be described herein, it has been shown that by controlling where and how the skin plate bends it is possible to improve the stability of the area around the stoma and to distribute the load on the convex skin plate so that the risk of dislodging and pressure ulcers is reduced.

    BRIEF DESCRIPTION



    [0017] In a first aspect, the invention relates to a convex shell for use in a base plate of an ostomy appliance according to claim 1.

    [0018] By providing a convex shell having a varied flexibility, it is possible to control how the base plate of an ostomy appliance folds during use, resulting in improved comfort for the user and decreasing the risk of the ostomy appliance detaching from the skin.

    [0019] In one embodiment, the convex shell comprises an outer planar surface extending in a first plane perpendicular to the centre axis C - C of the through-going hole, the outer planar surface extending radially inwards from the outer edge and transitioning into an intermediate slanting surface, where the intermediate slanting surface extends radially inwards from the outer planar surface towards an inner planar surface, where the inner planar surface extends in a second plane perpendicular to the centre axis C - C of the through-going hole and extends radially from the intermediate slanting surface towards the inner edge defining the through-going hole.

    [0020] In another embodiment of the convex shell, a first angle is defined between the slanting surface and the inner planar surface along the first axis, a second angle is defined between the slanting surface and the inner planar surface along the second axis; and the first and second angle are different.

    [0021] In particular, the first angle can be between 40° and 60°, in particular 50°, and the second angle can be between 25° and 45°, in particular 35°. Advantageously, the first angle gradually decreases towards the second angle.

    [0022] This allows for a convex shell having varying flexibility and making it possible to determine how sharp the bend can be. For example, a very steep change in the angle creates a bend in a very small area, while a change over a large area creates a smother bend. This is, for example, useful in reducing the risk of pressure wounds.

    [0023] In a comparative example, the bend can be controlled by providing a convex shell, wherein a first thickness of the convex shell along the intermediate slanting surface along the first axis is different from a second thickness of the convex shell along the intermediate slanting surface along the second axis. The first thickness can, for example, gradually taper towards the second thickness.

    [0024] The present invention relates to a convex shell for use in a base plate of an ostomy appliance, the convex shell comprises an annular ring defined by an outer edge and an inner edge defining a through-going hole, said ring further comprising at least four transition sections extending transversely across the annular ring, dividing the annular ring into at least a first, second, third and fourth segment, wherein a 'transition section' is a section wherein the characteristics between two neighbouring segments of the convex shell change.

    [0025] By changing the characteristics of the convex shell in such sections, it is possible to control the bending of the shell and, as will be described herein, it will be possible to keep the area around the stoma more stable and resistant towards collapsing, while providing improved flexibility in the peristomal area for better comfort.

    [0026] Furthermore, as described above, a convex shell is an element used for manufacturing of convex skin plates. The convex shell is characterised in that it has a convex surface contour. An outer planar surface is provided annularly along the outer edge, and extends mainly in one plane. The outer planar surface extends radially inwards towards where it continues into an intermediate slanting surface, which both extends radially inwards but also extends along the axis of the through-going hole. Finally the intermediate slanting surface transitions into an inner planar surface which is provided annularly along the inner edge and extends mainly in another plane than the one the outer planar surface extends in.

    [0027] As may be understood, in other words, the outer planar surface is axially displaced along the axis of the through-going hole in respect to the inner planar surface. The radius from the axis of the through-going hole to the outer edge of the inner planar surface is smaller than the radius from the axis of the through-going hole to the inner edge of the outer planar surface, and the inner planar surface is connected to the outer planar surface by an intermediate slanting surface.

    [0028] In one embodiment, the annular ring has an oval shaped outer edge and/or the inner edge is shaped as an oval. This provides a convex shell which has a shape which follows the curvature of folds and movement of the body and thus is more comfortable to wear.

    [0029] Such an oval shape is typically symmetrical around a first and a second axes and in that the at least four transition sections are arranged closest to the axis of which the oval shape has the largest extent. However, other symmetrical configuration may be used, e.g. the oval is only symmetrical around one axis and/or the transition sections are closer to the axis with the smallest extent of the oval shape.

    [0030] In one embodiment, the transition sections are provided as grooves. This is a simple and easy way to control bending in an object. Bending will usually occur in areas having less amount of material opposed to areas having a higher amount of material as this result in a higher rigidity of the object in these areas.

    [0031] In one embodiment, the segments are arranged symmetrically. This can for example be done by arranging the first and third segments opposite each other, and the second and fourth segments opposite each other.

    [0032] In another embodiment, the first and third segments have a higher thickness than the second and fourth segments. This is an additional and/or alternative way to control the bending. This would result in that the shell will tend to bend in the transition sections where the thickness changes.

    [0033] In another embodiment, the first and third segment is formed by a different material than the second and fourth segments, which is another and/or alternative way to control the bending.

    [0034] In another embodiment, the second and fourth segments have a higher flexibility than the first and third segments.

    [0035] In order to achieve increased stability around the stoma some users additionally prefer to wear a belt which is attached to the convex skin plate. Thus, in one embodiment a skin plate is provided comprising at least four belt attachment means. For example, at least four belt loops may be arranged along the outer edge of the annular ring.

    [0036] For such embodiment, a belt will typically be provided which comprises at least four skin plate attachment means allowing the skin plate and the belt to be coupled together.

    [0037] The convex shell may be joined to the skin plate in different ways. In an example, the convex shell is attached to a backing layer whereon an adhesive suitable for adhering to the skin is applied.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0038] 

    Fig. 1 shows a top view of a convex shell,

    Fig. 2 shows a side view and in section of the convex shell of Fig.1 along line II - II,

    Fig. 3 shows a side view along same intersection as in Fig.2 of a convex shell during use,

    Fig. 4 shows a top view of a second embodiment of a convex shell, and

    Fig. 5 shows a side view in section of the second embodiment of the convex shell of Fig. 4 along line V - V.


    DETAILED DESCRIPTION



    [0039] One embodiment of a convex shell 1 is shown in fig. 1 and 2. The convex shell is attached to backing layer 2 whereon a skin friendly adhesive 3 is applied. Together the convex shell, backing layer and adhesive form a convex skin plate 4.

    [0040] The convex skin plate is part of an ostomy appliance (not shown), for example by welding an ostomy pouch (not shown) to the backing layer or the convex shell or using coupling means (not shown) which allows the ostomy pouch to be detachably attached to the convex skin plate.

    [0041] The convex shell 1 comprises an annular ring 5 defined by an outer edge 6 and an inner edge 7. The inner edge 7 defines a through-going hole 8 which has an axis C - C. Furthermore, when considering the convex shell along the axis C - C of the through-going hole 8, the convex shell is symmetrical around axes A - A and B - B, which are perpendicular to each other.

    [0042] In use the convex shell will preferably be applied on a user so the axis A - A will be mainly vertical and the axis B - B will be mainly horizontal when a user is standing. Or, in other words, the convex shell will be applied so that the natural movements of the user will cause the convex shell, and thereby the convex skin plate, to bend around the axis B - B.

    [0043] Four transition sections, formed as first, second, third and fourth grooves 10,11,12,13 extend transversely across the annular ring. The grooves divide the annular ring into at least a first segment 15 defined by the first and second grooves; a second segment 16 defined by the second and third grooves; a third segment 17 defined by the third and fourth grooves; and a fourth segment 18 defined by the fourth and first grooves.

    [0044] The grooves do not necessarily extend all the way across the annular ring, which also is the case of the embodiment of Fig. 1 and 2. The desired effect as will be described later may also be provided by only partially extending grooves.

    [0045] As can be seen in particular from Fig.2, the convex shell has a convex surface contour. It should be understood that the term convex shell should be interpreted broadly as the shape does not have to be the mathematically correct representation of convex, but may be e.g. trapezoidal or circular.

    [0046] For example, a convex shell can in broader terms be understood as being a shell having an outer planar surface 20 which is provided annularly along the outer edge 6 of the annular ring, and extends mainly in one plane. The outer planar surface 20 extends radially inwards, in respect to the axis C - C of the through-going hole 8, until it transitions into an intermediate slanting surface 21, which both extends radially inwards but also extends along the axis C - C of the through-going hole 8. Finally the intermediate slanting surface 21 transitions into an inner planar surface 22 which is provided annularly along the inner edge 7 and extends mainly in another plane than the one the outer planar surface 20 extends in.

    [0047] As may be understood, in other words, the outer planar surface 20 is axially displaced along the axis C - C of the through-going hole 8 in respect of the inner planar surface 22. The maximum radial extent of the inner planar surface 22 is smaller than the minimum radial extent of the outer planar surface 20, and the inner planar surface 22 is connected to the outer planar surface 20 by the intermediate slanting surface 21.

    [0048] It will mainly be the intermediate slanting surface 21, which decides the contour of the shell.

    [0049] The convex shell 1 is attached to the backing layer 2 by a first annular weld 25 between the outer planar surface 20 and the backing layer 2, and a second annular weld 26 between the inner planar surface 22 and the backing layer 2. It should be understood that the means and place of attachment are not relevant to the present invention and other means could be used, e.g. an adhesive or a soluble, and it could be attached to other places for example at the intermediate slanting surface 21 and the attachments may be interrupted.

    [0050] A hole 27 is provided in the backing layer 2 and adhesive 3 which is coaxially aligned with the through-going hole 8 of the convex shell.

    [0051] As can be seen in Fig. 2, the first groove 10 extends along an axis i - i and the fourth groove 13 extends along an axis ii - ii. In a similar way, although not shown, the second groove 11 extends along the axis i - i, and the third groove 12 extends along the axis ii - ii.

    [0052] When applied to a user, as shown in Fig. 3, the adhesive side is attached to the skin 30 so that a stoma 31 (which for illustrative purposes is shown with interrupted lines) is received through the hole 27 and the through-going hole 8. Before applying the user might need to manually cut the hole 27 into a shape corresponding to his/hers stoma in order for the convex skin plate to fit snugly around the stoma.

    [0053] When the user is active as shown in Fig. 3, e.g. by bending, the motion will cause the convex skin plate to deform. In traditional skin plates, this will cause a deformation around a point lying along a deformation axis (not shown) parallel to the axis B - B, in a plane defined by the axis B - B and the axis C - C. However, due to the first and fourth grooves 10, 13 (and second and third grooves which are not shown) the deformation will mainly occur in the grooves, i.e. in points lying along the axes i - i and ii - ii. This reduces the deformation of the stoma considerably.

    [0054] At the same time, since bending occurs around two axes (i - i and ii - ii) instead of one (C - C) the load, i.e. the forces applied to the convex skin plate by the user when active, is distributed over twice the area thereby reducing the risk of pressure wounds.

    [0055] Thus, as may be understood, the reduced material in the transition sections provided by grooves results in a transfer of the major part of the deformation away from the stoma area and to an area capable of better absorbing the loads.

    [0056] In order to follow the contour of the body, the grooves (transition sections) may additionally be arranged at an angle to the horizontal axis B - B. This allows the bend at the grooves to follow the curvature of the abdomen and any skin folds which may occur.

    [0057] It is the change of characteristics of the convex shell in these transition sections which allows for controlling the bending, and the transition sections are not limited to be provided as grooves in order to obtain this function.

    [0058] Alternatively the transition sections may be provided by a change in material used to manufacture the convex shell. Thus, using the embodiment of Fig.1 - Fig.3, second segment 16 and the fourth segment 18 may be formed of a material which is more rigid than a second material used to provide the first segment 15 and the third segment 17. The relative more rigid second and fourth segment 16,18 will keep the stoma and the area surrounding it more stable during activity, while transferring the major part of the deformation to the transition sections and the first and third segment 15,17. Such rigidity may alternatively/additionally be provided by a different thickness in the material of the corresponding segment, making thicker segments more rigid and thus more stable toward deformation.

    [0059] Moreover, the shape of the convex shell may also provide stability. Thus, for example, by shaping the through-going hole 8 as an oval, a higher stability is provided around the stoma and the area surrounding it.

    [0060] It should be understood that although in some cases deformation may be undesirable it is mainly not a desire to remove deformation but mainly to control where deformation is occurring. A convex skin plate allowing for too little deformation, i.e. being too rigid, is uncomfortable to the user. Thus, it is a matter of compromise to obtain a product which is very flexible while still being rigid in some areas in order to provide both the convex shape but also to control where it is deformed.

    [0061] Other ways of controlling the deformation and/or of preventing complete collapse (the first segment and the third segment fold onto each other) of the ostomy appliance and thereby risking that access to the ostomy pouch (not shown) is closed off, are achieved by four so-called belt ears 35,36,36,38 provided along the outer edge of the convex shell. The belt ears function as belt attachment means for attaching a belt (not shown) to the convex skin plate. The belt further reduces the risk that the skin plate dislodges from the skin.

    [0062] By providing the belt ears at selected points along the outer edge of the convex shell, it is furthermore possible to control the deformation of the convex skin plate.

    [0063] Similar to the transition section, it is thus prevented that deformation only occurs around a point lying along a deformation axis which crosses the stoma and thus deformation of the stoma, but rather that the majority of the deformation is transferred to areas away from the stoma by attaching the belt in places along two axes arranged along respective opposite sides outside of the area of the stoma.

    [0064] By arranging the belt ears further from the horizontal axis B - B than the transition sections, it is prevented that force is applied within the area of the stoma and thus reducing the risk of deforming the stoma during use.

    [0065] A second embodiment of the convex shell 101 is shown in fig. 4 and fig. 5. The convex shell is formed of an annular ring 105 defined by an outer edge 106 and an inner edge 107. The inner edge defines a through-going hole 108.

    [0066] The convex shell has an outer planar surface 120, which extends in a first plane D -D. The first plane is perpendicular to the centre axis C - C of the through-going hole 108. The outer planar surface extends radially inwards from the outer edge and transitions into an intermediate slanting surface 121. The intermediate slanting surface 121 extends along the centre axis C - C and radially inwards from the outer planar surface and transitions into an inner planar surface 122. The inner planar surface extends in a second plane E - E perpendicular to the centre axis C - C of the through-going hole. The inner planar surface extends radially from the intermediate slanting surface towards the inner edge defining the through-going hole.

    [0067] By changing the angle along the intermediate slanting surface so that it has different angles, a varied flexibility can be obtained, thereby allowing to control the bending of the base plate and solving the problems as previous discussed.

    [0068] As shown in fig. 5, the angle of the intermediate slanting surface can be set as being the angle between the surface and the second plane E - E. Thus, in one area it forms the angle α and in another area it forms the angle β. If the angle α is set to 50° and the angle β is set to 35°, the convex shell will have a higher stiffness when trying to bend it around the area with the angle α compared to trying to bend it around the area with the angle β.

    [0069] The change in the angle may be done in one step, however, a continuous transition provides a soft bending area which is gentle to the skin and reduces the risk of creating pressure wounds.

    [0070] In addition to the different angles along the intermediate slanting surface, the convex ring is also provided with a varied thickness, t1 and t2 at the intermediate slanting surface which is another way of controlling the bending and flexibility of the convex ring.

    REFERENCE NUMBERS



    [0071] 

    1. convex shell

    2. backing layer

    3. skin friendly adhesive

    4. convex skin plate

    5. annular ring

    6. outer edge

    7. inner edge

    8. through-going hole

    9. first groove

    10. second groove

    11. third groove

    12. fourth groove

    15. first segment

    16. second segment

    17. third segment

    18. fourth segment

    20. outer planar surface

    21. intermediate slanting surface

    22. inner planar surface

    25. first annular weld

    26. second annular weld

    27. hole

    30. skin

    31. stoma




    Claims

    1. A convex shell (1) for use in a base plate of an ostomy appliance, the convex shell comprises an annular ring (5) defined by an outer edge (6) and an inner edge (7) defining a through-going hole (8), said ring (5) further comprises at least four transition sections (10, 11, 12, 13) extending transversely across the annular ring (5), dividing the annular ring (5) into at least a first (15), second (16), third (17) and fourth (18) segment,

    characterized in that

    each of the at least four transition sections (10, 11, 12, 13) is a section wherein the characteristics between two neighbouring segments (15, 16, 17, 18) of the convex shell change.


     
    2. A convex shell according to claim 1, wherein the annular ring (5) has an oval shaped outer edge (6).
     
    3. A convex shell according to claim 1 or 2, wherein the annular ring (5) has an oval shaped inner edge (7).
     
    4. A convex shell according to any of the preceding claims, wherein the oval shape is symmetrical around a first and a second axes and that the at least four transition sections (10, 11, 12, 13) are arranged closest to the axis of which the oval shape has the largest extent.
     
    5. A convex shell according to any of the preceding claims, wherein the transition sections (10, 11, 12, 13) are provided as grooves.
     
    6. A convex shell according to any of the preceding claims, wherein the first and third segment (15, 17) are arranged opposite each other and the second and fourth segment (16, 18) are arranged opposite each other.
     
    7. A convex shell according to any of the preceding claims, wherein the first and third segment (15, 17) are thicker than the second and fourth segment (16, 18).
     
    8. A convex shell according to any of claims 1-6, wherein the first and third segment (15, 17) is formed of a different material than the second and fourth segment (16, 18).
     
    9. A convex shell according to any of claims 1-6, wherein the first and third segment (15, 17) has a higher flexibility than the second and fourth segment (16, 18).
     
    10. A convex shell according to any of the preceding claims, wherein at least four belt loops are arranged along the outer edge (6) of the annular ring (5).
     
    11. A convex shell according to any of the preceding claims, further comprising

    an outer planar surface provided annularly along the outer edge, extending mainly in one plane, the outer planar surface further extending radially inwards towards where it continues into

    an intermediate slanting surface extending both radially inwards and along axis C - C of the through-going hole, and transitioning into

    an inner planar surface which is provided annularly along the inner edge, and extending mainly in another plane,

    such that the outer planar surface is radially displaced along axis C - C of the through-going hole in respect to the inner planar surface.


     


    Ansprüche

    1. Konvexe Schale (1) zur Verwendung in einer Basisplatte einer Stomavorrichtung, wobei die konvexe Schale einen kranzförmigen Ring (5) umfasst, der durch einen äußeren Rand (6) und einen inneren Rand (7) definiert ist, die ein Durchgangsloch (8) definieren, wobei der Ring (5) ferner mindestens vier Übergangsabschnitte (10, 11, 12, 13) umfasst, die sich quer über den kranzförmigen Ring (5) erstrecken und den kranzförmigen Ring (5) in mindestens ein erstes (15), ein zweites (16), ein drittes (17) und ein viertes (18) Segment unterteilen,
    dadurch gekennzeichnet, dass
    jeder der mindestens vier Übergangsabschnitte (10, 11, 12, 13) ein Abschnitt ist, in dem sich die Eigenschaften zwischen zwei benachbarten Segmenten (15, 16, 17, 18) der konvexen Schale ändern.
     
    2. Konvexe Schale nach Anspruch 1, wobei der kranzförmige Ring (5) einen ovalen äußeren Rand (6) hat.
     
    3. Konvexe Schale nach Anspruch 1 oder 2, wobei der kranzförmige Ring (5) einen ovalen inneren Rand (7) hat.
     
    4. Konvexe Schale nach einem der vorhergehenden Ansprüche, wobei die ovale Form um eine erste und eine zweite Achse symmetrisch ist und die mindestens vier Übergangsabschnitte (10, 11, 12, 13) der Achse am nächsten angeordnet sind, von der das Oval das größte Ausmaß hat.
     
    5. Konvexe Schale nach einem der vorhergehenden Ansprüche, wobei die Übergangsabschnitte (10, 11, 12, 13) als Nuten vorgesehen sind.
     
    6. Konvexe Schale nach einem der vorhergehenden Ansprüche, wobei das erste und das dritte Segment (15, 17) einander gegenüber angeordnet sind und das zweite und das vierte Segment (16, 18) einander gegenüber angeordnet sind.
     
    7. Konvexe Schale nach einem der vorhergehenden Ansprüche, wobei das erste und das dritte Segment (15, 17) dicker als das zweite und das vierte Segment (16, 18) sind.
     
    8. Konvexe Schale nach einem der Ansprüche 1 - 6, wobei das erste und das dritte Segment (15, 17) aus einem anderen Material als das zweite und das vierte Segment (16, 18) ausgebildet sind.
     
    9. Konvexe Schale nach einem der Ansprüche 1 - 6, wobei das erste und das dritte Segment (15, 17) eine höhere Flexibilität als das zweite und das vierte Segment (16, 18) haben.
     
    10. Konvexe Schale nach einem der vorhergehenden Ansprüche, wobei mindestens vier Gürtelschlaufen entlang dem äußeren Rand (6) des kranzförmigen Rings (5) angeordnet sind.
     
    11. Konvexe Schale nach einem der vorhergehenden Ansprüche, ferner umfassend
    eine äußere planare Fläche, die kranzförmig entlang dem äußeren Rand vorgesehen ist und sich hauptsächlich in einer Ebene erstreckt, wobei sich die äußere planare Fläche ferner radial nach innen erstreckt, von wo sie in
    eine geneigte Zwischenfläche übergeht, die sich sowohl radial nach innen als auch entlang der Achse C - C des Durchgangslochs erstreckt und in
    eine innere planare Fläche übergeht, die kranzförmig entlang dem inneren Rand vorgesehen ist und sich hauptsächlich in einer weiteren Ebene erstreckt,
    so dass die äußere planare Fläche radial entlang der Achse C - C des Durchgangslochs bezüglich der inneren planaren Fläche versetzt ist.
     


    Revendications

    1. Coque convexe (1) destinée à être utilisée dans une plaque de base d'un appareil de stomie, la coque convexe comprenant une bague annulaire (5) définie par un bord extérieur (6) et un bord intérieur (7) délimitant un trou traversant (8), ladite bague (5) comprenant en outre au moins quatre sections de transition (10, 11, 12, 13) s'étendant transversalement à travers la bague annulaire (5), divisant la bague annulaire (5) en au moins un premier (15), un deuxième (16), un troisième (17) et un quatrième (18) segment, caractérisée en ce que
    chacune des au moins quatre sections de transition (10, 11, 12, 13) est une section dans laquelle les caractéristiques entre deux segments adjacents (15, 16, 17, 18) de la coque convexe changent.
     
    2. Coque convexe selon la revendication 1, dans laquelle la bague annulaire (5) a un bord extérieur (6) de forme ovale.
     
    3. Coque convexe selon la revendication 1 ou 2, dans laquelle la bague annulaire (5) a un bord intérieur (7) de forme ovale.
     
    4. Coque convexe selon l'une quelconque des revendications précédentes, dans laquelle la forme ovale est symétrique autour d'un premier et d'un deuxième axe et en ce que les au moins quatre sections de transition (10, 11, 12, 13) sont disposées le plus près de l'axe le long duquel la forme ovale présente la plus grande étendue.
     
    5. Coque convexe selon l'une quelconque des revendications précédentes, dans laquelle les sections de transition (10, 11, 12, 13) sont prévues sous forme de rainures.
     
    6. Coque convexe selon l'une quelconque des revendications précédentes, dans laquelle le premier et le troisième segment (15, 17) sont disposés à l'opposé l'un de l'autre et le deuxième et le quatrième segment (16, 18) sont disposés à l'opposé l'un de l'autre.
     
    7. Coque convexe selon l'une quelconque des revendications précédentes, dans laquelle le premier et le troisième segment (15, 17) sont plus épais que le deuxième et le quatrième segment (16, 18) .
     
    8. Coque convexe selon l'une quelconque des revendications 1 à 6, dans laquelle le premier et le troisième segment (15, 17) sont formés d'un matériau différent de celui du deuxième et du quatrième segment (16, 18).
     
    9. Coque convexe selon l'une quelconque des revendications 1 à 6, dans laquelle le premier et le troisième segment (15, 17) présentent une plus grande flexibilité que le deuxième et le quatrième segment (16, 18).
     
    10. Coque convexe selon l'une quelconque des revendications précédentes, dans laquelle au moins quatre boucles de ceinture sont disposées le long du bord extérieur (6) de la bague annulaire (5).
     
    11. Coque convexe selon l'une quelconque des revendications précédentes, comprenant en outre une surface plane extérieure située en position annulaire le long du bord extérieur, s'étendant principalement dans un seul plan, la surface plane extérieure s'étendant en outre radialement vers l'intérieur où elle se prolonge par une surface intermédiaire inclinée s'étendant à la fois radialement vers l'intérieur et le long de l'axe C-C du trou traversant, et se poursuit par une surface plane intérieure qui est située en position annulaire le long du bord intérieur, et s'étendant principalement dans un autre plan, de telle sorte que la surface plane extérieure soit déplacée radialement le long de l'axe C-C du trou traversant par rapport à la surface plane intérieure.
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description