Film tensioning element

Abstract

The film tensioning element (10) according to the invention is held by means of a lip ring (14) and a vestibule ring (16), between which the film (12) extends and, if necessary, over the ring. The film (12) and the rings (14, 16) are elastically deformable and it is provided that the film (12) has a lug (24, 26) at two opposite locations. At least one elastic band (20, 22) extends between the lugs (24, 26) and is suitable for tightening the film (12) radially inwards.

Description

Technical Field

[0001] The invention relates to a film tensioning element. Background Art

[0002] Such film tensioning elements have been known for a long time. For example, see WO 03 / 51185 A1. Such film tensioning elements are intended to ensure free access to the patient's oral cavity. For this purpose, a film is provided which is arranged elliptically or circularly and extends between two rings, the so-called lip ring and the so-called vestibular ring. The film can also be supported movably on one of the rings.

[0003] The film is at least elastic and thus adapts to the contour of the patient's lips and at the same time covers them.

[0004] The lip ring and the vestibular ring are more rigid than the film tensioning element. Therefore, the lip ring and the vestibular ring stretch the film tensioning element between them, and it can be said that the film tensioning element opens the patient's mouth.

[0005] The anatomical conditions of the oral cavity and in particular of the vestibule and lip region generally vary significantly from patient to patient. This is to be taken into account in the known solutions by means of the elasticity of the film tensioning element. Here, the film extends from the vestibule of the patient over the constriction on the lips and outwards, where a larger lip ring is to achieve a better distribution of the forces that occur.

[0006] Particularly in the oral cavity, ie in the region of the vestibular ring, the introduced tensile forces are often perceived as uncomfortable by the patient, since the vestibular ring usually rests on the patient's jawbone.

[0007] Therefore, it is known from EP 3 160 381 A1 to produce a preload bearing structure which takes the tether into account and thereby reduces the introduced tensile forces.

[0008] This constitutes a clear improvement over the original solution, but in principle still can be improved further.

[0009] Another problem with the film tensioning elements used hitherto is that the pressure exerted on the lips varies greatly from patient to patient.

[0010] The pressure depends on the size of the two rings in comparison with the patient's mouth on the one hand and of course also on the materials used on the other hand.

[0011] In particular, excessive pressure on the jaw and frenulum can cause discomfort. On the other hand, the expansion function of the film tensioning element is mainly borne by the forces acting radially outwards.

[0012] Therefore, film tensioning elements are usually kept in stock in different sizes in order to adapt them to the different anatomies of different patients.

[0013] Since the membrane must have a high degree of elasticity, materials suitable for this purpose, such as elastomers or soft silicone, are usually used. Summary of the invention

[0014] In contrast, the object of the present invention is to provide a film tensioning element according to the invention which allows for better acceptability.

[0015] The film tensioning element according to the invention is distinguished according to the invention in that the film is tensioned radially inwards by a special elastic band which runs annularly around or along the film and in the region between two rings. Furthermore, the elastic band does not have to counteract the blocking function of the film tensioning element itself. In the installed state, however, the elastic band rests on the transition region between the outside and the inside of the lip or is located on the inside of the lip.

[0016] Thus, the tension acting on the vestibular ring is achieved and the vestibular ring is pulled away from the alveolar ridge and away from the lip frenulum. Therefore, the vestibular ring now lies parallel to a position of the soft tissue of the lip and cheek that is less sensitive to pressure.

[0017] The elastic band extends slightly further over the vestibular ring than over the lip ring, again due to their size ratios; typically the diameter of the lip ring is, for example, 10% or 20% larger than the diameter of the vestibular ring.

[0018] The wearing comfort is significantly improved by means of the film tensioning element according to the invention. The film is pulled inwards so that the vestibular ring is more prominent in the oral cavity, thereby facilitating the installation of the film tensioning element. The pressure on the jawbone is lower, thereby reducing the pain reaction which in the past would have led to the vestibular ring being removed from the patient's mouth and the ongoing operation being continued without auxiliary equipment.

[0019] The elastic band according to the invention is preferably supported in a floating manner on the film. The elastic band is preferably fixed by one, more preferably by two lugs. The lugs extend from the vestibular ring along the film, but in such a way that the elastic band is also spaced apart from the vestibular ring at this location.

[0020] The elastic band has such elasticity that it can be placed over a portion of the vestibular ring. A circular elastic band is provided, or two elastic bands are provided, which complement each other to form a circle. In this case, each elastic band can be turned over a corresponding portion of the vestibular ring.

[0021] Furthermore, the elastic band can be fastened to the film tensioning element at any position. This fastening can be achieved, for example, at two points between the film and the elastic band. However, it has proven to be particularly advantageous to have two mutually opposite tabs originate from the vestibular ring and to fasten them to the film here by means of spot welds, for example at a distance of about 1 cm from the vestibular ring.

[0022] In an advantageous embodiment, it is provided that the tab is connected or is connected to the membrane tensioning element at a connection point which is spaced apart from the vestibular ring.

[0023] However, the elastic band can also be attached to a partial circle of the film, in which case the film partially achieves the desired effect according to the invention.

[0024] In an advantageous embodiment, it is provided that the or each elastic band, in the state folded over the vestibular ring, pulls the vestibular ring radially further inwards at a connection point further away from the tab than adjacent to the tab.

[0025] In an advantageous embodiment, it is provided that the or each elastic band has approximately (ie + / - 30%) the same thickness as the tab, but the width of the tab is two to ten times, in particular approximately three times, the width of each elastic band.

[0026] In an advantageous embodiment, it is provided that two elastic bands are supported on the same tab at a distance of a few millimeters from one another in the tangential direction of the ring and extend from this tab to the opposite tab.

[0027] In an advantageous embodiment of the invention, it is provided that the elastic band in the unslipped state extends between the tabs in a compliant or minimally tensioned manner, ie with a tension significantly less than 10% of its maximum tension.

[0028] In another advantageous embodiment of the present invention, the elastic band and the tab are integral with each other and / or are made of the same material.

[0029] The elastic band preferably extends at least for the most part radially outside the film. Preferably, the elastic band can be turned over a part of the vestibular ring and can tension the film radially inwards together with the vestibular ring. The elastic band is connected to the film and / or to the vestibular ring and / or to the lip ring at at least one, preferably at least two, connection locations.

[0030] The thickness and width of the elastic band can be adapted to requirements within a wide range. For example, the elastic band can have a circular, oval, square or rectangular or any other cross section.

[0031] The elastic band fits particularly well on the film when it has a flat cross section, ie a cross section in which the thickness is smaller than the width.

[0032] The elastic band preferably lies on the outside of the film and lies on significantly more than half (length) of the annular extension of the film.

[0033] The distance between it (the elastic band) and the vestibular rings is preferably smaller at the position or positions where it is connected to a membrane or a ring, for example 1 mm to 15 mm, and at a position spaced apart from said position, that is to say, for example, at a position extending laterally when positioned on the mouth, the distance between the elastic band and the vestibular rings is greater, being up to half of the distance between the rings, or more than half.

[0034] The elastic band can be turned over the ring during production and shipped in this state. Alternatively, it can also be arranged that the elastic band is pulled onto the ring by the customer.

[0035] It is also possible to use a commercially available rubber band, for example a rubber band with a rectangular or square cross section and connect the rubber band to the film and / or a ring at at least one location, for example at a tie, and extend the rubber band circumferentially around the film.

[0036] In its extended position, the elastic band reduces the diameter of the film and gathers the film.

[0037] In another embodiment, it is provided that the cross section and thus also the tension of the or each elastic band varies in its course and thus simulates the lip anatomy:

[0038] For example, the tension can be set higher in the lateral areas and lower in the upper and lower parts.

[0039] At this moment, compared with the top and the bottom, the film is gathered more strongly at the side. At least in the region of the film, this makes it possible to obtain a flat elliptical cross section for the film tensioning element which is initially circular.

[0040] A prerequisite for this is that the elastic band is connected to the film at multiple locations, in particular also laterally.

[0041] Also can make a plurality of elastic bands be arranged side by side around the film in the side view.These elastic bands can have the same elasticity and tension force, but also can have different tension forces when needed.

[0042] For example, the middle elastic band can have the greatest tension, while the elastic bands extending between this elastic band and each ring can each have a lesser tension.

[0043] For example, by means of the aforementioned multiple provision of elastic bands, the film is preferably automatically pretensioned into the shape of a lip or a shape similar to a lip.

[0044] Film material or film-like material can also be used to form the or each elastic band. Such an elastic band can have a thickness of 0.05 to 1 mm and a width of 3 to 8 mm. Preferably, it is 0.3 mm×5 mm.

[0045] The elastic band can also be adhesively bonded to the film, whereby the connecting structure is distributed around the entire circumference of the film and the elastic band is securely connected to the film.

[0046] The film can be designed as a layered film with a plurality of layers. A layer can then form the elastic band, preferably in an annular manner, approximately centrally between the rings, or slightly offset toward the vestibular ring.

[0047] The elastic band can also be configured as a thickening of the film extending centrally between the rings. The thickening can be continuous or have knots and form a constriction according to the invention due to its greater tension.

[0048] The contour of the film, viewed in a transverse view, approximates the contour of the lips due to the elastic band and its position, which also makes the introduction of the film tensioning element into the mouth opening significantly easier.

[0049] In this regard, a particular advantage results from the fact that the usability of the film tensioning element is significantly improved with the elastic band according to the invention which realizes the constriction of the film.

[0050] According to the invention it is preferred that the elastic band can be turned over a part of the vestibular ring. Alternatively, the elastic band can also be turned over the lip ring or over a part of the lip ring. Preferably, the elastic band is connected to the relevant ring at two tabs, but its elasticity is significantly greater than the ring. In the relaxed state, the elastic band is shorter than the circumference of the ring. However, due to its elasticity, the elastic band can be pulled to or moved over the outer circumference of the ring without any problems.

[0051] To activate the film strip, simply lift the elastic strip, for example with one or two fingers, and pull it over, ie, over the relevant section. This is done in a factory and with the aid of a machine.

[0052] In an advantageous embodiment, two elastic bands are provided which, in the relaxed state, extend like flexible bowstrings between mutually opposite locations of the vestibular ring. The film tensioning element is manufactured in this manner.

[0053] The two tabs extend toward each other from opposite locations of the vestibular ring and each tab opens into the two ends of the elastic band on the supporting base.

[0054] It is preferably provided that the connection point is located between the vestibule ring and the supporting matrix.

[0055] It is preferably provided that the raised edge of the vestibular ring has a cushion structure which leaves a recess at the tangential connection point of the tab.

[0056] In an advantageous embodiment, the tab is folded over and fixedly adhered to the film approximately 0.5 cm to 12 mm from the vestibular ring, for example by laser welding, ultrasonic welding, gluing or sewing or other joining methods. This, on the one hand, puts the elastic band or bands under tension. However, the tension in the elastic band is so low that the elastic band in question is not torn.

[0057] For activation, the right elastic band is now folded over or over the right part of the vestibular ring, and the left elastic band is folded over or over the left part of the vestibular ring.

[0058] The two elastic bands now together form a circle which rests on the membrane from the outside and preloads the membrane radially inwards. This preloading is effected at a small distance from the vestibular ring, for example at a distance of 1 cm, where the distance to the vestibular ring increases as the distance to the tab increases, so that the elastic bands slide here in the direction of the midpoint between the lip ring and the vestibular ring into a position of minimum energy (potential energy).

[0059] The film pre-installed in a compliant state is pre-tensioned radially inwards at this location by the elastic band. On the other hand, the elastic band forms a soft ring, because there is material excess under the current smaller diameter.

[0060] This ring also acts as a cushion and feels very comfortable on the sensitive lip skin because it has great elasticity.

[0061] In an advantageous embodiment of the invention, it is provided that the film has a tab at at least two opposite locations.

[0062] In a further advantageous embodiment of the invention, it is provided that the film and the elastic band have a modulus of elasticity which is 80% to 99% lower than the modulus of elasticity of the ring.

[0063] In a further advantageous embodiment of the invention, it is provided that the tab extends along the film tensioning element away from the vestibular ring and guides or supports the or each elastic band at its distal end.

[0064] In another advantageous embodiment of the invention, it is provided that the tab extends over a portion of the distance between the lip ring and the vestibular ring, in particular less than 60% of the distance, and particularly preferably over 10% to 45%, and preferably over approximately 30%.

[0065] In another advantageous embodiment of the invention, it is provided that the tab is approximately three times as wide as the width of each elastic band.

[0066] In a further advantageous embodiment of the invention, it is provided that the elastic band has a non-destructive stretchability of at least twice, in particular preferably ten to fifty times, its original length.

[0067] In a further advantageous embodiment of the invention, it is provided that the elastic band and the film pretensioning shrink radially inwardly by 10 to 30% of their diameter and in particular generate cushion-like folds in the film tensioning element.

[0068] In a further advantageous embodiment of the invention, it is provided that the elastic band can be tensioned radially inwardly and is connected or can be connected to the film or a ring at at least two connecting points.

[0069] According to another aspect of the present invention, a film tensioning element is proposed, in particular a film tensioning element for dental treatment, the film tensioning element having a lip ring and a vestibule ring, between which a film extends and, if necessary, beyond the lip ring and the vestibule ring. The film and also the lip ring and the vestibule ring are elastically deformable. The film is folded over the vestibule ring or the lip ring. Here, the film is fixedly connected to the two rings or to at least one of the two rings. Firstly, the effect of the elastic band according to the present invention is achieved by this fixed connection. The elastic band extends along the film at the end of the folded film that is spaced apart from the two rings and extends in the area between the two rings. The elastic band can be used to tension the film radially inward at a position between the rings. This unexpectedly significantly improves the wearing comfort.

[0070] In an advantageous embodiment of this solution, it is provided that the elastic band is designed as an annular thickening at the folded-over end of the film and / or that the elastic band has a smaller diameter than the ring in the relaxed state.

[0071] According to another aspect of the invention, a film tensioning element is provided, in particular for dental treatment, which has a lip ring and a vestibule ring, between which the film extends and, if necessary, beyond which the film extends. The film and also the lip ring and the vestibule ring are elastically deformable. The film is fixedly connected to the two rings, and at least one elastic band extends at a distance from the two rings and between the two rings and substantially parallel to the two rings, the elastic band being in particular integral with the two rings, by means of which the film can be tensioned radially inwards at a position between the rings.

[0072] In an advantageous embodiment of this solution, the elastic band is formed by forming nubs which extend along the elastic band, in particular at regular intervals.

[0073] According to another aspect of the invention, a film tensioning element is provided, in particular a film tensioning element for dental treatment, the film tensioning element having a lip ring and a vestibule ring, between which the film extends and, if necessary, beyond the lip ring and the vestibule ring. The film and also the lip ring and the vestibule ring are elastically deformable. At least one elastic band extends radially outside the film, the elastic band can be tightened on a part of the vestibule ring and / or the lip ring, the film can be tensioned radially inwardly by means of the elastic band and can be connected or is connected to the film or a ring at at least one, preferably at least two, connection points. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Further advantages, details and features result from the following description of a number of exemplary embodiments of the invention with reference to the drawings.

[0075] in:

[0076] Figure 1 A perspective view of a film tensioning element according to the invention is shown in one embodiment;

[0077] Figure 2 Use a top view to show Figure 1 Film tensioning element;

[0078] Figure 3 and 3a Show according to Figure 1 and 2 The membrane tensioning element, but the elastic band has been turned over part of the vestibular ring;

[0079] Figure 4 Show Figure 3 Detailed enlargement of ;

[0080] Figure 5 Show Figure 3 Detailed top view of

[0081] Figure 6 A detailed cross-sectional view showing another embodiment of a film tensioning element according to the present invention;

[0082] Figure 7 A side view showing another embodiment of a film tensioning element according to the invention;

[0083] Figure 8 A side view showing another embodiment of a film tensioning element according to the invention;

[0084] Figure 9aA sectional view showing another embodiment of a film tensioning element according to the invention; and

[0085] Figure 9b A perspective view shows a further embodiment of a film tensioning element according to the invention. DETAILED DESCRIPTION

[0086] Figure 1 The film tensioning element 10 shown has a film 12 which extends between a lip ring 14 and a vestibule ring 16 .

[0087] The two rings are highly rigid but still able to deform elastically.

[0088] The membrane extends approximately in the form of an annulus or shell, so that neither the vestibule ring 16 nor the interior of the lip ring 14 is filled with material.

[0089] In this embodiment, the lip ring 14 is slightly larger than the vestibular ring 16 in a manner known per se.

[0090] At least one elastic band 20 extends across the vestibular ring 16. In the embodiment shown, a further elastic band 22 extending parallel to the elastic band 20 is also provided.

[0091] The elastic bands 20 and 22 may be spaced significantly further apart from one another, thereby forming a half-moon-shaped constriction.

[0092] The anchoring of the two elastic strips is achieved on the tabs 24 and 26 , with each elastic strip 20 and 22 extending between the two tabs 24 and 26 .

[0093] The tabs 24 and 26 are themselves fastened to the vestibular ring 16 and, in the preferred embodiment shown, are additionally fastened to the membrane 12 .

[0094] The elastic bands 20 and 22 are preferably made of the same material as the film 12 and are highly elastic.

[0095] The elastic bands have such elasticity that they can be turned over the relevant adjacent parts of the vestibular ring, that is, the right elastic band 20 can be turned over the right part 28 and the left elastic band 22 can be turned over the left part 30 of the vestibular ring 16.

[0096] If both elastic bands 20 and 22 are turned over the vestibular ring 16 , the two elastic bands essentially form a circle.

[0097] Depend on Figure 2 and 3 It can be seen how the lugs 24 and 26 are constructed. Each lug is fixed to the vestibular ring like a tongue, so that the two lugs 24 and 26 are opposite to each other.

[0098] Each tab furthermore extends radially outside the membrane 12 , partially protruding beyond said membrane.

[0099] Tab 24 is connected to film 12 at location 36 by ultrasonic welding, while tab 26 is connected to the film at the opposite location.

[0100] These two positions are clearly spaced apart from the vestibular ring. However, the protrusion 24 or 26 extends slightly beyond the position 36 observed respectively to the support base 40 ( Figure 4 The support base 40 is located at the distal end of the protrusion 24 or 26, and the elastic bands 20, 22 start from here and separate from each other ( Figure 5 ).

[0101] In this position, the elastic bands 20, 22 are turned over to the Figure 2 and extends beyond the vestibule ring 16 to the open end of the membrane tensioning element 10 .

[0102] However, the two elastic bands 20 and 22 can also be tensioned and pulled or turned over the vestibular ring 16. This state is Figure 3 In this state, the right elastic band 20 is pulled further to the right until it extends over the right portion 28 of the vestibular ring 16. The elastic band is loosened again slightly behind this portion so that it contracts again and has approximately the same Figure 3 shape.

[0103] In this shape, the elastic band 20 tensions the film 12 radially inwardly. The position at which this occurs is determined by the length of the tabs 24, 26, and in particular by the position of the connection point 36.

[0104] The film 20 is transformed into a ring 50 which additionally performs a damping function.

[0105] The elastic band 20 automatically slides into the position where the potential energy is the lowest, that is, the position where the tension between the lip ring 14, the vestibular ring 16, the membrane 12 and the elastic band 20 is balanced.

[0106] exist Figure 3 The position shown in is optimal for achieving wearing comfort for the patient, while still achieving reliable coverage of the mouth opening.

[0107] Depend on Figure 3a and 2 A comparison of the results shows that the film 12 has a smaller clear diameter in the radial direction when the elastic band 20 is activated and is prestressed radially inwards.

[0108] Depend on Figure 4 The elastic band 20 is shown in detail. Figure 3Visible position. When viewed from the welded connection point 36 , the support base 40 is slightly offset in the direction of the lip ring 14 .

[0109] The elastic band 20 extends from here and contacts the film 12 radially on the outside.

[0110] The exact position is determined by the length of the tab 24 , which determines the distance to the vestibular ring 16 , and also by the position of the connection point 36 .

[0111] Alternatively, the elastic band 20 can also be guided by means of a correspondingly longer tab 24 starting from the lip ring 14 .

[0112] Depend on Figure 5 The tab 24 is shown in a top view. The tab 24 is made of the same material as the film 12 and the elastic bands 20 and 22. The support matrix 40 allows the loop formed by the elastic bands 20 and 22 to have an approximately circular shape.

[0113] It can also be seen that the tab 24 is approximately three times the width of the elastic bands 20 and 22. The elastic bands 20 and 22 preferably have a flat oval cross-section so that they can fit well onto the film 12.

[0114] Figure 6 Another embodiment of the invention is shown. In this embodiment, an elastic band 20 according to the invention is integrated into the film 12. The elastic band thus extends along the film over its entire annular circumference as an annular thickening of the film.

[0115] The thickening 20 has a greater tension than the rest of the film 12. This results in the film having a constriction at the location of the thickening 20, which extends in a manner compatible with the lip, that is to say approximates the rounded shape of the lip bulge.

[0116] When viewed from the outside and in section, the membrane together with the elastic band 20 forms a concave arch which gently embraces the lips and at the same time ensures that the vestibular ring is pulled away from the jawbone.

[0117] In accordance with Figure 7 In the embodiment of the present invention, the membrane 12 is stretched between the vestibule ring 16 and the lip ring 14. In this embodiment, an elastic ring 20 is introduced circumferentially into the membrane 12. The elastic ring 20 extends approximately in the middle region between the vestibule ring 16 and the lip ring 14. The elastic ring is designed as a thickening and preferably has a prismatic cross section, as shown by Figure 7 This can be seen in the cross-sectional view shown.

[0118] In this solution, the elastic band 20 pulls the film 12 radially inwards. This reduces the pressure acting radially outwards on the lip, thereby improving the wearing comfort of the film tensioning element 10.

[0119] In accordance with Figure 8 In the embodiment of , the elastic band 20 is formed by surrounding the knobs 52. The knobs form a material thickening at this location, so that here too, the lip is relieved by the radially inward pulling force of the elastic band 20.

[0120] According to Figure 9a and 9b In the embodiment of , the membrane 12 is extended beyond the vestibular ring 16. The membrane ends in an elastic band 20 which is designed in an annular shape.

[0121] The film extension 54 formed in this way can be folded over the vestibular ring 16. At this time, the film strip 20 presses the middle area between the vestibular ring 16 and the lip ring 14 radially inward at the end of the film extension 54, which in turn achieves the desired unloading of the lips and thus improves the wearing comfort.

[0122] The diameter of the opening 56 of the elastic band 20 can be adapted to the requirements within a wide range. If the elastic band 20 is thicker, after the film extension 54 including the elastic band 20 is turned over the vestibular ring 16, the diameter of the opening 56 is reduced and the diameter of the middle area of ​​the film 12 is also reduced.

[0123] Here, the elastic band 20 is designed to be foldable, but it is understood that, instead of such an elastic band, the elastic band 20 can also be directly pulled into the middle area of ​​the film 12 .

Claims

1. A film tensioning element having a lip ring (14) and a vestibular ring (16), with a film (12) extending between the lip ring and the vestibular ring, the film (12) and the lip ring and vestibular ring being elastically deformable, characterized in that, the film (12) has tabs (24, 26) at at least two opposite positions respectively, and at least one elastic band (20, 22) extends between the tabs, the elastic band being able to be pulled or flipped over a part (28, 30) of the vestibular ring (16) and / or the lip ring (14), and the film (12) being able to be tensioned radially inwards by means of the elastic band.

2. The film tensioning element according to claim 1, characterized in that, the film tensioning element is a film tensioning element for dental treatment.

3. The film tensioning element according to claim 1, characterized in that, the film (12) and the elastic bands (20, 22) are more elastic than the lip ring and the vestibular ring.

4. The film tensioning element according to claim 3, characterized in that, the film (12) and the elastic bands (20, 22) have a modulus of elasticity that is 80% to 99% smaller than that of the lip ring and the vestibular ring.

5. The film tensioning element according to any one of claims 1 to 4, characterized in that, there are two elastic bands (20, 22), and the elastic bands can be tensioned such that they can complement each other to form a circle.

6. The film tensioning element according to any one of claims 1 to 4, characterized in that, each elastic band (20, 22) can be flipped or pulled over a part of the vestibular ring (16).

7. The film tensioning element according to any one of claims 1 to 4, characterized in that, the tabs (24, 26) extend away from the vestibular ring (16), and the or each elastic band (20, 22) is guided or supported on a support substrate (40) spaced apart from the vestibular ring (16).

8. The film tensioning element according to claim 7, characterized in that, the tabs (24, 26) extend away from the vestibular ring (16) along the film tensioning element (10).

9. The film tensioning element according to claim 7, characterized in that, the or each elastic band (20, 22) is guided or supported on the distal end portions of the tabs (24, 26).

10. The film tensioning element according to any one of claims 1 to 4, characterized in that, the tabs (24, 26) are integrally molded onto the film tensioning element (10) and / or are made of the same material.

11. The film tensioning element according to claim 10, characterized in that, the tabs (24, 26) extend over a part of the distance between the lip ring (14) and the vestibular ring (16).

12. The film tensioning element according to claim 10, characterized in that, the tabs (24, 26) extend over less than 60% of the distance between the lip ring (14) and the vestibular ring (16).

13. The film tensioning element according to claim 10, characterized in that, The tabs (24, 26) extend over 10% to 45% of the distance between the lip ring (14) and the vestibular ring (16).

14. The film tensioning element according to claim 10, It is characterized in that The tabs (24, 26) extend over 30% of the distance between the lip ring (14) and the vestibular ring (16).

15. The film tensioning element according to any one of claims 1 to 4, It is characterized in that The elastic band (20) has a flat or flat oval cross-section, the width of which extends along the film tensioning element (10), and / or the or each elastic band (20, 22) extends along the film tensioning element (10) externally on the film tensioning element when folded over the vestibular ring (16) and pretensions the film tensioning element radially inward.

16. The film tensioning element according to any one of claims 1 to 4, It is characterized in that The elastic band (20, 22) has a non-destructive stretchability greater than 1.2 times its original length.

17. The film tensioning element according to any one of claims 1 to 4, It is characterized in that The elastic band (20, 22) has a non-destructive stretchability of at least twice its original length.

18. The film tensioning element according to any one of claims 1 to 4, It is characterized in that The elastic band (20, 22) has a non-destructive stretchability of ten to fifty times its original length.

19. The film tensioning element according to any one of claims 1 to 4, It is characterized in that Starting from the vestibular ring (16), a raised edge extends away from the film tensioning element in the extension of the film tensioning element (10), and the tabs (24, 26) are arranged on the raised edge.

20. The film tensioning element according to any one of claims 1 to 4, It is characterized in that The elastic bands (20, 22) contract the film tensioning element (10) radially inwardly when the elastic bands (20, 22) are folded over the vestibular ring (16).

21. The film tensioning element according to any one of claims 1 to 4, It is characterized in that The elastic bands (20, 22) shrink the film tensioning element (10) radially inward by 10% to 30% of its diameter when the elastic bands (20, 22) are turned over the vestibular ring (16).

22. The film tensioning element according to any one of claims 1 to 4, It is characterized in that The elastic bands (20, 22) produce cushion-like folds in the film tensioning element.

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