MOUNTING DEVICE FOR A LIGHT GUIDE

Abstract

The invention describes a mounting device for a light guide, comprising a sleeve with an end surface and at least one fiber bundle, the fiber bundle being fused at least partially or in places on its peripheral surface with a glass tube around its entire periphery. The fiber bundle has a common end surface with the glass tube and forms a conical zone towards the common end surface. The common end surface has a rigid fused cross-section with the glass tube and can be made as a sanded and / or polished surface. Fig. 2

Description

Title of the invention: MOUNTING DEVICE FOR A LIGHT GUIDE FIELD OF INVENTION

[0001] The invention relates to a mounting device for a light guide, comprising a sleeve with an end surface and at least one fiber bundle, the fiber bundle being fused at least partially or in places on its peripheral surface to a glass tube around its entire periphery. The fiber bundle has a common end surface with the glass tube. In this context, the fiber bundle forms a tapered section with the glass tube towards the common end surface, and the common end surface has a rigid, fused cross-section. The common end surface is, or can be, made as a sanded and / or polished surface. Furthermore, the fiber bundle to the glass tube is fixed, or can be fixed, by bonding material at least partially or in places in or on the sleeve, or in or on the fixing section of the sleeve, by means of an adhesive in the tapered area.

[0002] Such light guides with a fiber bundle fused to a glass tube are described in Applicant's document DE3620368C2. It illustrates a fiber optic light guide with a front surface area composed of one end of an optical fiber bundle and a section of glass tube applied to said end, the front surface being polished. It is provided that both the glass tube section and the optical fiber bundle are made of high-temperature resistant glass and that the glass tube section is applied to the optical fiber bundle in the fused state over a defined length such that the gussets existing between the individual optical fibers and / or the gussets existing between the optical fibers and the tube section are filled at least partially by the material of the glass tube section and / or by the material of the optical fiber cladding.

[0003] Said method for manufacturing light guides of this type is also designated as GTF (Glass Tube Fusion). Said light guides are then mounted in a metal sleeve or are transformed into optical fiber cables and are used mainly in medical applications.

[0004] Both documents DE19703515C1 and DE10013482C2 also describe fiber bundles with a fused glass tube section. In both cases, the glass tube is detached again to subsequently mount the fiber bundles in a sleeve. Complex processes are also used for this purpose, which can damage the light guides.

[0005] When mounting fused glass tube fiber bundles of this type in a mounting sleeve, generally made of stainless steel, using an adhesive, it has been found that this can cause stresses in the fiber composite, which can then induce cracking. This occurs particularly in the medical-technical use of light guides of this type when they must be prepared after use by thermal processes, such as steam sterilization, for multiple reuse. Large temperature variations occur, which damage the light guide and render it unusable after only a few such cycles.

[0006] US patent 2016011356 describes, to prevent damage to a fused optical fiber end, a flexible light guide with at least one fused optical fiber end fixed in an end piece, and a layer of padding material between the fused optical fiber end and the end piece. The padding material layer is intended to compensate for differences in thermal expansion and contraction of the fused optical fiber end and the end piece to prevent damage to the fused optical fiber end, such as can occur during repeated passages through an autoclave. The padding layer can be made, for example, by wrapping the fused optical fiber end with PTFE tape, thread sealant tape, or similar material.

[0007] This approach seems feasible at first glance, particularly for avoiding tension. However, this approach has the drawback that such padding layers do not guarantee a compact structure. Due to microscopic gaps, germs can become established in these gaps, which cannot be completely eliminated even by autoclaving, thus increasing the risk of contamination. This can lead to serious complications for patients, especially in the medical-technical field.

[0008] The use of permanently elastic adhesives is another approach to preventing cracking caused by or due to temperature variations. However, it turns out that such adhesives often lack the long-term stability required, for example, for several hundred autoclaving cycles, as is often required. Over time, the chemical bonds in the adhesive break down, leading to the decomposition or even liquefaction of these adhesives with each successive preparation cycle, thus rendering the light guide unusable. OBJECTIVE OF THE INVENTION

[0009] The invention therefore aims to provide a mounting device that overcomes the aforementioned drawbacks and allows for a robust, long-term stable light guide that is resistant to temperature variations for use durable, particularly in the medical-technical field, or a light guide assembly of this type. BRIEF DESCRIPTION OF THE INVENTION

[0010] The problem of the invention is already solved by the subject matter of the independent claim. Advantageous configurations and improvements are the subject matter of the dependent claims.

[0011] According to the invention, the mounting device has an offset between the common end surface of the fiber bundle and the glass tube relative to the section where the sleeve is attached with the adhesive, such that the common end surface is positioned, or can be positioned, at a distance from the section where the adhesive is attached with an offset. The common end surface, which is particularly susceptible to cracking from the fusion of the glass tube, then forms an overhang or protrudes freely by a defined amount from the end surface of the sleeve, such that the section where the adhesive is attached is isolated from the sensitive area of ​​the common end surface. Thus, stresses induced by the adhesive or the bonding process on the common end surface of the fiber bundle and the glass tube can be avoided or at least reduced.

[0012] In other words, a mounting device is provided for a light guide that has a sleeve with an end surface and at least one fiber bundle, the fiber bundle being surrounded on its peripheral surface by a glass tube and being fused at least partially or in sections around its entire periphery, and the fiber bundle having or forming a common end surface with the glass tube. Furthermore, the fiber bundle forms a tapered section with the glass tube towards the common end surface, and the common end surface has a rigid cross-section fused with the glass tube. The common end surface is or can be made as a sanded and / or polished surface.Furthermore, the fiber bundle with the glass tube is fixed, or can be fixed, by material bonding, at least partially or in places, within or on the sleeve, or on the sleeve's fixing section, using an adhesive in the tapered area. The material bond is thus formed, in particular, within or on the fixing section, but can also extend inside the sleeve, opposite the end surfaces, therefore behind the fixing section within or on the sleeve. The common end surface of the fiber bundle is also offset from the fixing section of the sleeve such that the common end surface of the fiber bundle with the glass tube is positioned, or can be positioned, at a distance from the fixing section with an offset, and the fixing section and the common end surface are separated, or can be separated, from each other.

[0013] In the context of the invention, the mounting device specifically comprises a sleeve in which the fiber bundle can be mounted or bonded to the fused glass tube by means of adhesive. A fiber bundle fused in this manner can be provided in a light guide at both the distal and proximal ends or at both ends of the light guide. The mounting device is also considered as a device enabling the installation, connection, arrangement, or attachment to or with other devices, modules, or components. These may include light sources, camera modules, or endoscopic handpieces in the medical field, but also in other fields of application.

[0014] A light guide of this type comprises, at least as light guiding element(s), a plurality of optical fibers forming a fiber bundle. The fiber bundle may also be provided to be at least partially or locally grouped within a sheath or enclosed within it, thus forming a fiber optic cable with a sheath. In the area of ​​a sleeve or ferrule, the sheath may be removed, and only the light guiding elements may be fixed within the sleeve by material bonding and / or by complementary shape, possibly also by force. Fixing within a sleeve may also be provided in conjunction with the sheath. The light guiding element or optical fibers are preferably glass optical fibers (GOFs) and are generally manufactured in the form of core-cladding systems.

[0015] In an advantageous configuration of the mounting device for a light guide, The offset between the common end surface of the fiber bundle and the glass tube and the end surface of the sleeve is in the range of 0.1 mm to 2 mm, preferably in the range of 0.5 mm to 1.0 mm. It has therefore been found that such an offset, or offset dimension, between the common end surface of the fiber bundle and the glass tube and the adhesive surrounding the fiber bundle in the bonding section is advantageous. This is due, on the one hand, to the fact that the exposed overhang must not be too large with regard to its mechanical stability. In principle, offset dimensions greater than a maximum of 2 mm are also conceivable, but not advisable due to the increasing mechanical sensitivity of such a configuration.On the other hand, a minimum distance between the fusion zone—that is, the molten area of ​​the fiber bundle and the glass tube, particularly in or near the common end surface—and the adhesive edge or the bonding of the fiber bundles to the glass tube in the sleeve is necessary to ensure sufficient insulation from mechanical stresses resulting, for example, from differences in thermal expansion of the adhesive and the sleeve relative to the glass, at the fusion zone. This mechanical stress is then applied. Stress in the common end surface is thus avoided, or at least reduced or minimized, so that the light guide withstands repeated thermal stresses without being damaged, for example, without cracking, scaling, or delamination. Such stresses occur regularly in the medical field, for example, during the preparation required there, particularly through thermal process steps during sterilization, such as autoclaving, after use, or before reuse of a light guide.

[0016] In another advantageous embodiment of the invention, it is provided, as an alternative or additional feature, that a gap of 0.05 mm to 0.2 mm is made or can be made in the fixing section between the glass tube and the sleeve inside, as a glue gap dimension for the adhesive, either partially or in certain areas. Excessive glue gap dimensions promote excessive eccentricity of the fiber bundle within the sleeve or may negatively affect the positional tolerance of the fiber bundle within the sleeve. This can be detrimental in the operating condition, particularly during the coupling or decoupling of the light or the positioning of the light guide relative to other modules connected to it.An insufficient gap size for the adhesive can lead to inadequate wetting of the adhesive on the surfaces and the formation of air pockets, which can be detrimental not only during preparation but also during use. Such air pockets can fill with fluids, germs, or contaminants, which is particularly unacceptable for medical applications on or in the body, or even when preparing products with chemical components. This can lead to further damage to the bond and ultimately, failure of the light guide.

[0017] In another preferred embodiment of the mounting device for a light guide, the sleeve is configured, either alternatively or additionally, such that the mounting section is positioned or can be positioned at a distance from the sleeve end surface by offset, and a ring is formed or can be formed such that a peripheral groove is formed in the area of ​​the common end surface in the mounted state between the ring and the glass tube, and the sleeve end surface and the common end surface of the fiber bundle and the glass tube form a plane. This makes it possible to obtain peripheral lateral mechanical protection of the exposed fiber bundle of the glass tube. It should be noted here that the sleeve ring can also extend beyond the common end surface of the fiber bundle and the glass tube.However, this is not favorable to the manufacturing process, as the light guide or its end surface is usually subjected to a sanding and grinding process. polishing with the fiber bundle mounted or glued in the sleeve and any overhang of the rim is thus removed.

[0018] In order to avoid excessively narrow gaps, which promote nucleation, as mentioned previously, the width of the groove (groove width) between the crown of the mounting sleeve and that with the glass tube is at least 0.3 mm, preferably at least 0.5 mm. This ensures that sterilization processes used in the medical field, such as steam sterilization or autoclaving, or plasma sterilization processes, e.g., the Sterrad™ process, guarantee a sufficiently large opening or attack surface and thus achieve a sufficiently high reduction, for example, a multiple reduction, e.g., 6 times, of the logarithmic levels of germs.Depending on the design of the light guide or the overall possible, permitted or required geometry of the mounting device, in particular with regard to its width or diameter transverse to its axis, the groove may have widths in the range up to 0.1 mm, in any case greater than 0.3 mm, or up to a few millimeters, for example in the range greater than or equal to 0.3 mm to 3 mm, preferably greater than or equal to 0.3 mm to 1.5 mm.

[0019] In an advantageous configuration of the mounting device for a light guide, the sleeve comprises or is made of stainless steel, for example, materials 1.4301 or 1.4305, plastic, or a combination of the two classes of materials, for example, in the case of a sleeve composed of several parts. For a plastic version, PPSU (polyphenylsulfone) or PEEK (polyetheretherketone) based plastics have proven their worth in the medical-technical field. These are characterized, on the one hand, by sufficient thermal stability and, on the other hand, by particularly high mechanical rigidity.

[0020] Besides stainless steel, other metallic materials are also possible, for example nickel-plated silver or brass. However, stainless steel is preferred in terms of corrosion resistance and biocompatibility, particularly in a medical-technical field. In principle, the following selection criteria are advantageous for the material: firstly, the material must be sufficiently mechanically stable with regard to the final grinding and polishing process to be able to be clamped in a clamping device. Secondly, the material must not have a tendency to "lubricate," i.e., it should preferably be rather brittle and / or filled with glass fibers (glass-fiber-filled plastics) or other fillers, for example ceramics or vitreous materials. These can also be well bonded to the fiber bundle of the light guide.

[0021] In advantageous embodiments of the mounting device for a light guide, the adhesive comprises or is made of hard, brittle epoxy adhesives High crosslinking capacity. These are used to ensure sufficiently high-quality reprocessing. This often requires more than 100 to 1,000 preparation cycles, particularly autoclaving cycles. The decisive properties of the adhesive for such hard, brittle, and high-crosslinking glues are: the highest possible tensile shear strength, the highest possible glass transition temperature (which, like high or increased hardness, is also an indicator of the degree of crosslinking), the lowest possible coefficient of thermal expansion, the lowest possible modulus of elasticity, and a relatively low transverse shrinkage index or shear modulus, which are not usually available in technical data sheets. Often, only the modulus of elasticity is given.

[0022] Typical adhesives suitable for this purpose generally have Shore D hardness values ​​of 75 to 95 in the cured, cured, or treated state and typically have a glass transition temperature > 95 °C. The tensile shear strength is typically > 13.5 N / mm², which corresponds to approximately > 2,000 psi. Shore hardness is correlated with the modulus of elasticity and shear strength. However, the exact curing conditions of the adhesive and any loads are usually more decisive. In particular, long annealing times and / or high temperatures allow for high degrees of crosslinking. Depending on the chemical composition of the adhesive, combined crosslinking that can occur in several stages is also possible. For example, pre-crosslinking with UV light and subsequent thermal crosslinking can result in high degrees of crosslinking.

[0023] It should be noted here that this is in fact a conflict of objectives. On the one hand, particularly stable adhesives are required, capable of withstanding several hundred preparation cycles, especially during autoclaving, where high chemical bond stability is required, as is correspondingly the case during plasma sterilization. On the other hand, these very adhesives induce stresses that lead to stress cracking in the glass-fiber tube composite even during the curing process. However, this can be avoided, or at least significantly reduced, by the configuration according to the invention, as described above.

[0024] A particularly advantageous use of the mounting device, as described in its previous embodiments, involves its use for a light guide and / or for a fiber optic cable, which can be prepared several times after each use by means of a sterilization process in the medical-technical field or in medical-technical or medical applications. This approach according to the invention can be advantageously used in particular for light guides or fiber optic cables as a link between The light source and the endoscope, or for connection to such modules and / or for light guides mounted in the endoscope. Industrial applications are also conceivable, for example in the fields of energy technology, aeronautics, and aerospace, where particularly high temperatures or large temperature variations play an important role. DESCRIPTION OF THE FIGURES

[0025] The invention is described in more detail below with the aid of figures,

[0026] on which one can see:

[0027] [Fig. 1] Diagram of a mounting device according to the prior art,

[0028] [Fig.2] Diagram of a mounting device according to the invention,

[0029] [Fig.3] Diagram of a variant of the mounting device with a sleeve that forms a crown and

[0030] [Fig.4] diagram of another variant compared to the variant illustrated in [Fig.3].

[0031] Figure [1] illustrates a diagram of the mounting device according to the prior art Consider a light guide 1, consisting of a fiber bundle 2, which has been fused on its peripheral surface 2.5 with a glass tube 3 according to the GTF process described in the introduction. The fiber bundle 2 exhibits a taper 2.4. This taper 2.4 results from the increasing packet density of the individual fibers due to progressive fusion with themselves and the glass tube 3 until complete fusion or a fully fused portion within or near the common end surface 2.3, encompassing it with themselves. The fiber bundle 2 with the glass tube 3 thus presents, at least near its common end surface 2.3, a fused and therefore rigid section 2.2, to which a transition zone is connected. In this zone, the fibers are only partially fused, and this transition zone then passes into an unfused section 2.1. Within this unfused section, the fibers are then freely articulated within the fiber bundle 2.

[0032] Typical diameters of such fused fiber bundles 2 are in the range of 0.5 to 10 mm. The taper length 2.4, or the transition zone between the unfused section 2.1 of the fiber bundle 2 and the common end surface 2.3 of the fiber bundle 2 and the glass tube 3, is typically between 0.5 mm and 20 mm. The transition zone between the unfused section 2.1 and the fully fused section 2.2 can, in this context, have values ​​ranging from 2 mm to 10 mm. Consequently, the diameter of the mounting device is of a similar order of magnitude, and in any case larger, than the diameter of the fiber bundle used. For a fiber bundle with a diameter of 2 mm, a total diameter of the mounting device of at least 3 mm can thus be assumed. The minimum possible wall thicknesses of the sleeve 4 are certainly specified by their material or the maximum total diameters, permissible or required are often determined by the application of light guides mounted in this way.

[0033] This GTF fiber bundle is then fixed in a sleeve 4 in the area of ​​a fixing section 4.3 of the sleeve 4 with an adhesive 5. Ideally, the introduced adhesive 5 fills the gap up to the common end surface 2.3 to avoid gaps or holes. The sleeve 4 is ideally made of stainless steel, but can also be made of fiber-reinforced or filled plastics, as described previously. The final common end surface 2.3 of the fiber bundle 2 is then created with the end surface of the sleeve 4 by a subsequent sanding and polishing process. The disadvantage, as described previously, is the stress induced in the molten section 2.2 of the fiber bundle 2, which is already present during the hardening of the adhesive 5. Further stresses are then generated by temperature variations during preparation, for example, by steam sterilization.This often leads to cracks on the common end surface 2.3, which, on the one hand, significantly reduces the yield during manufacturing and, on the other hand, considerably limits the service life or the number of preparation cycles.

[0034] Figure 2 illustrates a diagram of an embodiment according to the invention. In this embodiment, the fiber bundle 2 manufactured by the GTF process extends beyond the sleeve 4 by the offset dimension 6, such that the adhesive 5 maintains a sufficient distance from the melted section 2.2 of the fiber bundle 2 within the adhesive gap or the fixing section 4.3. This reduces the stress input both during assembly or adhesive curing and during preparation cycles during use, thereby significantly minimizing the risk of crack formation. In a preferred configuration of the invention, it has been shown that for the offset 6 or the offset dimension between the common end surface 2.3 of the fiber bundle 2 and the glass tube and the adhesive 5 or the fixing section 4.3 surrounding the fiber bundle 2, an offset dimension of at least 0.1 mm to 2 mm is advantageous, with an offset dimension of 0.5 mm to 1.0 mm being particularly preferred. Tests have shown that this offset dimension 6 is largely independent of the diameter of the fiber bundle 2 with the glass tube 3. The adhesive or bonding should have an adhesive gap dimension between the glass tube 3 and the inner surface of the sleeve 4 of 0.05 mm to 0.2 mm.

[0035] A potential drawback of the embodiment illustrated in [Fig. 2] lies in the fact that the edges of the common end surface 2.3 of the fiber bundle 2 fabricated by the GTF process are poorly protected and exposed. Therefore, [Fig. 3] shows a schematic of another embodiment shown, in the sleeve 4 is designed so that the fixing section 4.3 is positioned at a distance from the end surface 4.1 by the offset 6, and a ring 4.2 is formed such that, in the mounted state between the ring 4.2 and the glass tube 3, a peripheral groove 7 is formed in the area of ​​the common end surface 2.3, and the end surface of the sleeve 4.1 and the common end surface 2.3 of the fiber bundle 2 and the glass tube 3 form a plane. This provides peripheral lateral mechanical protection for the exposed end of the fused fiber bundle of the glass tube.

[0036] In order to avoid excessively narrow gaps, which either promote or prevent the formation of germs or fouling by germs or contaminants, as mentioned in the introduction, the groove 7 has a groove width 7.1 of at least 0.3 mm, preferably at least 0.5 mm. During assembly, care must be taken to ensure that this groove 7 between the ring 4.2 and the glass tube 3 is not exposed to or filled with glue 5.

[0037] Optionally, after assembly and the sanding and polishing process of the common end surface 2.3, the groove 7 may be filled with a permanently elastic and self-leveling casting compound 8, which prevents, for example, particles that are difficult to remove during the processing from adhering to it. Such casting compounds 8 exhibit, in particular, correspondingly high temperature resistance, so that they are particularly resistant to temperature stresses during steam sterilization of the order of 135 °C to 140 °C, depending on the cycle used, repeated several times, generally several hundred times. Furthermore, these casting compounds exhibit high resistance to hydrolysis and chemicals. Silicone casting compounds, for example, so-called LSR (Liquid Silicon Rubber) casting compounds or permanently elastic epoxy casting compounds, are particularly suitable.

[0038] Figure 4 illustrates a variant of the embodiment shown in Figure 3, which also features the optional casting mass 8. The conical GTF melt differs from the melts shown in Figures 1 to 3 in that the ratio of the diameters of the unmelted beam, i.e., the unmelted section 2.1, to the melted section 2.2 is achieved by an additional manufacturing step so as to be greater than that for the other melts. Thus, the end surface 2.3 of Figure 4, compared to the variants in Figures 1 to 3, has a smaller or reduced diameter.Sleeve 4 may also have, as shown schematically here, other sections which have, for example, in part or in places a reduced wall thickness, particularly in the area of ​​the end surfaces and / or have additional clamping or snap-fit ​​elements (not shown here), which in turn promote or allow at least the mounting of a light guide in this way. assembled on a light source, a camera module, or a handpiece, for example, of an endoscope. To facilitate the insertion or threading of the fiber bundle 2 into the glass tube 3 before GTF fusion, the glass tube 3 may have a lip 3.1 on the threading side. This lip 3.1 may be made as a rounded edge, as shown, or also as a conical section (not shown). LIST OF REFERENCE NUMBERS

[0039] 1 Light guide

[0040] 2 Fiber bundle

[0041] 2.1 Unmelted Zone

[0042] 2.2 Melted Zone

[0043] 2.3 Common end surface

[0044] 2.4 Tapering

[0045] 2.5 Peripheral surface

[0046] 3 Glass tube

[0047] 3.1 Rim

[0048] 4 Sleeve

[0049] 4.1 Sleeve end surface

[0050] 4.2 Crown

[0051] 4.3 Fixing section

[0052] 5 Glue

[0053] 6 Offset

[0054] 7 Groove

[0055] 7.1 Groove width

[0056] 8 Casting mass

Claims

Demands

1. A mounting device for a light guide (1), comprising a sleeve (4) with an end surface (4.1) and at least one fiber bundle (2), wherein the fiber bundle (2) is fused at least partially or in places on its peripheral surface (2.5) with a glass tube (3) around its entire circumference, and the fiber bundle (2) has a common end surface (2.3) with the glass tube (3), wherein the fiber bundle (2) forms a tapered zone (2.4) with the glass tube (3) towards the common end surface (2.3), wherein the common end surface (2.3) with the glass tube (3) has a rigid, fused cross-section (2.2), and wherein the common end surface (2.3) is or can be made as a sanded and / or polished surface, and wherein the fiber bundle (2) is fixed or can be fixed by material bonding with the tube. glass (3) in the tapering area (2.4) by means of an adhesive (5) at least in part or in places in or on the sleeve (4) in or on the fixing section (4.3) of the sleeve (4), wherein the common end surface (2.3) of the fiber bundle (2) with the glass tube (3) has an offset (6) relative to the fixing section (4.3) of the sleeve (4) with the adhesive (5) such that the common end surface (2.3) is disposed or can be disposed at a distance from the fixing section (4.3) with the adhesive (5) with an offset (6) and the fixing section (4.3) and the common end surface (2.3) are separated or can be separated from each other.

2. Mounting device for a light guide (1) according to claim 1, wherein the offset (6) between the common end surface (2.3) of the fiber bundle (2) with the glass tube (3) and the end surface of the sleeve (4.1) is in the range of 0.1 mm to 2 mm, preferably in the range of 0.5 mm to 1.0 mm.

3. Mounting device for a light guide (1) according to claim 1 or 2, wherein a gap of 0.05 mm to 0.2 mm is made or can be made in part or in places in the fixing section (4.3) between the glass tube (3) and the sleeve (4) inside as a glue gap dimension for the glue (5).

4. Mounting device for a light guide (1) according to at least one of the preceding claims, wherein the sleeve (4) is made such that the fixing section (4.3) is disposed or can be disposed at a distance from the offset (6) of the end surface of the sleeve (4.1) and a crown (4.2) is made or can be made such that in the mounted state between the crown (4.2) and the glass tube (3), a peripheral groove (7) is made in the area of ​​the common end surface (2.3), and wherein the end surface of the sleeve (4.1) and the common end surface (2.3) of the fiber bundle (2) and the glass tube (3) form a plane.

5. Mounting device for a light guide (1) according to claim 4, wherein the groove (7) has a groove width (7.1) of at least 0.3 mm, preferably of at least 0.5 mm.

6. Mounting device for a light guide (1) according to at least one of the preceding claims, wherein the sleeve (4) comprises or is made of stainless steel, plastic material or a combination of both classes of materials.

7. Mounting device for a light guide (1) according to at least one of the preceding claims, wherein the adhesive (5) comprises or is made of a hard, brittle, high-crosslinking epoxy adhesive.

8. Use of the mounting device according to any one of the preceding claims for a light guide (1) and / or for a fiber optic cable, which can be prepared several times by a sterilization process in the medical-technical field.

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