Winding system for winding connected hollow fibers onto winding cores

Abstract

The invention relates to a winding system for winding connected hollow fibers, in particular hollow fibers permeable to matter and / or energy, onto a winding core (1), comprising a winding core (1) for an exchange device for exchanging matter and / or heat between two media, in particular an oxygenator and / or a heat exchanger, on which the connected hollow fibers can be wound and which is arranged, in particular designed, to be inserted into a housing of the device together with the hollow fibers wound thereon and to be retained therein, and further comprising at least one coupling element (2), preferably two coupling elements (2), the at least one coupling element (2) having two axially opposite connecting regions (2a, 2b) and being temporarily connectable with a first connecting region (2a) ) is connected to the winding core (1) in a non-rotatable manner and is connected to a drive in a non-rotatable manner with a second connecting area (2b), by means of which the winding core (1) can be rotated around the winding axis (A), the first connecting area (2a) of the connecting element (2) includes an expansion element (2d), in particular, the outer cross-section of the expansion element can be expanded by expansion, and the winding core (1) has a recess (1a) arranged around the winding axis (A) in at least one axial end face, preferably in both axial end faces, the first connecting area (2a) of the connecting element (2) can be inserted into the recess and the winding core (1) can be connected to the connecting element (2) in a non-rotatable manner by expansion of the expansion element (2d).

Description

Technical Field

[0001] The invention relates to a winding system for winding connected hollow fibers, in particular hollow fibers permeable to matter and / or energy, onto a winding core. Background Art

[0002] It is known in the prior art to wind material- or energy-permeable hollow fibers, in particular those connected to form a mat with warp yarns, onto a core in order to insert the wound hollow fiber package into an exchange device for material and / or energy exchange between two media, in particular in oxygenators and / or heat exchangers, as shown, for example, in publications EP 0 089 122 A2 and EP 0 285 812 A1.

[0003] To this end, the wound hollow fiber package is inserted into the housing of the exchange device and the hollow fiber ends are subsequently glued to each other and to the housing, which is also called potting. After the hollow fiber ends are opened inside the housing, i.e., after the end-side glue is removed, the two media can be guided separately through the hollow fiber wall, i.e., one medium, such as blood, flows past the hollow fibers externally, while another medium, such as a gas or gas mixture or a temperature-controlled fluid, flows through the hollow fibers.

[0004] In this case, the exchange can be carried out via hollow fibers, in particular via semipermeable hollow fibers, for example for the exchange of oxygen and carbon dioxide in an oxygenator. Such wound hollow fiber packages can also be used in substance exchange devices for dialysis purposes or for the removal of carbon monoxide. Summary of the Invention

[0005] Winding hollow fibers onto a core and integrating the resulting coil into an exchange device is a complex process that should be simplified by the present invention. Another object of the present invention is to simplify winding so that the winding core used for winding can, on the one hand, be easily adapted to a drive that allows motorized winding and, on the other hand, can be directly inserted into the exchange device. One particular object is to adapt the winding core to the drive in such a way that it can be quickly adapted and removed without leaving residue.

[0006] The object is achieved by a winding system for winding coupled hollow fibers, in particular hollow fibers permeable to matter and / or energy, onto a winding core, the winding system comprising a winding core for an exchange device for exchanging matter and / or heat between two media, in particular an oxygenator and / or a heat exchanger, the coupled hollow fibers being able to be wound onto the winding core, the winding core being arranged, in particular designed, to be inserted into a housing of the device together with the hollow fibers wound thereon and to be retained therein, and comprising at least one coupling element, preferably two coupling elements, the at least one coupling element having two axially oppositely disposed hollow fibers. The cam is secured to the drive shaft by means of a second connection area and is adapted to be connected to the winding core in a manner which prevents relative rotation of the cam and to the drive shaft, wherein the cam is secured to the drive shaft by means of a second connection area and an expansion element.

[0007] The core idea of the winding system is therefore based on the fact that the winding core used with the winding system can be used directly as a carrier for the hollow fibers after winding the hollow fibers or hollow fiber mats in an exchange device, such as the housing of a material exchange device, and for winding, in particular electric winding, the winding core can be connected to a drive in a simple and quick manner.

[0008] For this purpose, the winding system according to the invention uses a coupling element or preferably two coupling elements arranged opposite one another on a common rotation axis around the winding core, by means of which the adaptation to the drive can be achieved. The rotationally fixed fixation between the winding core and the coupling element is established by expansion of the respective coupling element at its first connection region facing the winding core or cooperating with the winding core.

[0009] This expansion can, for example, take place between two expansion positions, in which the connection between the connecting element and the winding core is separated and in which a non-rotatable connection is achieved, so that a drive connected to the second connection area of the connecting element can rotate the winding core and wind the hollow fiber mat guided onto the winding core.

[0010] In the context of the further description of the winding core and the coupling elements below, it should be noted that this description also applies if a coupling element can be attached to each of two opposite axial end faces / faces of the winding core. This is a preferred embodiment. In this case, the description of the winding core applies to both end faces / faces and to each of the two usable coupling elements, which can in particular be designed to be identical.

[0011] The expansion connection between the winding core and the coupling element has the advantage that the connection is effected in such a way that the two elements to be connected cannot perform an axial, ie, translational or rotational, movement relative to one another when the connection is produced.

[0012] In contrast, in an expansion connection, it is preferably achieved that the interacting contact surfaces are moved toward one another by the expansion of the expansion element and come into contact with one another, whereby a frictional and / or non-positive connection is achieved.

[0013] This is advantageous compared to other connection methods because it avoids material wear between the two connecting parts, which can occur, for example, when the coupling element is screwed into the winding core. If this wear were to be transferred to the substance exchange device during use of the winding core and possibly enter the patient's blood circulation, it could have a negative impact. Furthermore, the expansion joint according to the present invention has the advantage of being able to be manufactured using injection molding technology.

[0014] The winding core used in the winding system and, after the winding process, inserted into the housing of the exchange device and remaining therein for operation of the device, can, for example, be designed for this purpose in such a way that its geometry and / or dimensions are ultimately adapted to the housing so that it can be inserted into the housing without modification, other than removing the coupling elements. Furthermore, the winding core can preferably also have at least one channel within the winding core for this purpose, through which the medium can flow during subsequent operation.

[0015] In another advantageous embodiment, the winding core can also be designed or adapted for this purpose in that one recess (in particular, two recesses) in the winding core for accommodating the coupling element is formed by a channel extending at least partially through the winding core and through which a medium, in particular blood, can flow after the winding core is inserted into the housing of the substance exchange device. This channel thus has two functions: it serves to secure the coupling element in the winding system and, later, to transport the medium in the substance exchange device.

[0016] The passage can, for example, completely pass through the winding core axially, in particular so that two coupling elements can be placed on both sides of the winding core. In the case of two recesses for accommodating coupling elements, only one recess can be formed by a passage for conveying the medium, which in particular does not completely pass through the winding core axially.

[0017] The channel can open on one side into a recess for fastening the coupling element and at its other end into one or more openings in the circumference of the winding core, in particular if the channel does not completely pass axially through the winding core.

[0018] The through-channel can also have branches which open into the outer circumference of the winding core.

[0019] The openings in the circumference of the winding core make it possible for a medium, such as blood, to enter the wound hollow fiber package through these openings during later operation, preferably with a radial inflow component.

[0020] Furthermore, it can be provided that a (corresponding) recess in the winding core for accommodating the coupling element is surrounded by a channel extending at least partially coaxially with the recess, and through which a medium, in particular blood, can flow after the winding core is inserted into the housing of the substance exchange device. The above description also applies to such a coaxial channel, in particular if the channel then opens into the circumference of the winding core or has branches opening into it.

[0021] Independent of the aforementioned possibility of achieving the suitability of the winding core for a substance exchange device, the invention can provide that the at least one coupling element has a shank at its first connection region, which shank is divided in the axial direction into at least two axially parallel shank parts arranged side by side, with a wedge-shaped element being arranged between the shank parts as an expansion element and being displaceable axially between the shank parts. When the wedge-shaped element is displaced axially between the shank parts, the shank parts are thereby moved radially outward.

[0022] The shank preferably has at least three shank parts. The wedge-shaped element can preferably be configured as a cone or a cone segment. In its axial movement for expansion, the wedge-shaped element can preferably move from the first connection area to the second connection area. In order to make the movement force act on the wedge-shaped element, the wedge-shaped element can be guided through the hollow area of the handle, for example into the second connection area or leave the second connection area.

[0023] In another embodiment, it can be provided that the at least one coupling element has a shank at its first connection region, the shank having a shank section, around which a sleeve made of an elastic material, in particular an elastomer, preferably silicone rubber or a vulcanized natural rubber, is arranged as an expansion element. The sleeve can change its dimensions in the radial direction by axially moving its end faces toward one another, in particular by a force acting in the axial direction on an annular end face of the sleeve. In particular, it can be provided that the sleeve is free or in a relaxed state in the unconnected state between the coupling element and the winding core, and an axial force is applied to the sleeve for connection, which axial force moves the axial end faces of the sleeve toward one another, thereby causing the sleeve to thicken radially.

[0024] In one possible embodiment, it can be provided that the sleeve rests with its first of its two axial ends on a first force application surface of the coupling element that is fixed relative to the handle region, and with its second axial end on a second force application surface of the coupling element, the second force application surface being movable relative to the first force application surface in the axial direction of the sleeve, in particular on the handle, preferably by means of an operating element provided on the coupling element. The first fixed force application surface can be provided at the free end of the first connection region, which free end is inserted into the recess of the winding core. The outer cross-section / outer diameter of the force application surface is preferably greater than or equal to the diameter of the loose sleeve at its axial end and less than or equal to the inner cross-section / inner diameter of the recess in the winding core.

[0025] Independently of the method of expansion, the present invention can preferably provide that, in the expanded state, the position of the connecting element can be axially determined relative to the winding core, and preferably also axially fixed relative to an auxiliary element separated from the winding core, which auxiliary element can pass through the connecting element and rest on an axial end face of the winding core after the first connection area of the connecting element is inserted into the recess of the winding core.

[0026] The use of auxiliary elements to secure the coupling element in the recess of the winding core may have several advantages.

[0027] For example, the auxiliary element can be formed by a disk that protrudes radially beyond the cross section / diameter of the winding core. Such a disk can preferably be used to position, in particular center, the hollow fiber mat relative to the winding core during winding, in particular if coupling elements are fastened on both sides of the winding core by means of corresponding disks, so that the wound hollow fiber mat is positioned between the disks during winding.

[0028] In addition, the auxiliary element can form a second force application surface for the sleeve, and the sleeve contacts the second force application surface with its second axial end, in particular the end of the sleeve facing the second connection area of the connecting element. The second end of the sleeve facing the second connection area of the connecting element protrudes from the axial end face of the winding core when the connecting element is inserted into the winding core, and force can be applied to the sleeve by placing the auxiliary element, in particular, the second end of the sleeve can be moved toward the first end of the sleeve.

[0029] It can also be provided that the second end of the sleeve facing the second connection area of the connecting element is located below the axial end face of the winding core or in the plane of the axial end face when the connecting element is inserted into the winding core and that after the auxiliary element is placed, force can be applied by axial movement of the connecting element, in particular by movement out of the winding core, so that in particular the first end of the sleeve can be moved in the direction of the second end of the sleeve.

[0030] In both cases, the interaction of the auxiliary element or disc with one of the axial end faces of the sleeve causes the two end faces of the sleeve to move towards each other, resulting in a radial thickening of the sleeve.

[0031] Independently of the design of the expansion element, the invention can provide that the position of the coupling element can be axially fixed, for example, by a retaining ring engageable in an annular groove on the coupling element, by means of which the coupling element can be supported on the surface of the auxiliary element.

[0032] The annular groove can preferably be located between two connecting areas of the connecting element, in particular in a part of the connecting element which transitions into an area comprising or forming the expansion element, i.e. preferably into a shank area which has a sleeve or transitions into a wedge-shaped element.

[0033] Furthermore, in all possible embodiments it is provided that an operating element is provided on the coupling element, by means of which expansion of the first connection region and / or axial fixation of the coupling element can be effected, in particular the operating element being supported on an auxiliary element or an element having a second force application surface or on a supporting element arranged on the coupling element.

[0034] The operating element can be configured as a nut on a threaded section of the coupling element that is connected to the expansion element. The threaded section can, for example, transition into a shank region with a sleeve or into a wedge-shaped element.

[0035] The operating element can also be designed, for example, as an eccentric that can be moved by means of a lever. This eccentric can rotate about an axis and is supported on the coupling element or auxiliary element. The portion with the axis transitions into a shank region that carries a sleeve or into a wedge-shaped element. Thus, the eccentric movement can displace the axis in the coupling element and actuate the expansion element, in particular, the sleeve can be compressed or the wedge-shaped element can be displaced axially. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] Figure 1 An overview of the components of a winding system is shown. DETAILED DESCRIPTION

[0038] The winding system comprises a winding core 1, onto which a hollow fiber or hollow fiber mat (not shown here) can be wound. The winding core 1 preferably has a central recess 1a on its two opposite end faces, arranged around the winding axis A. Preferably, the recess extends from each end face into the winding core. The recess is formed by a channel in the winding core. The recess 1a is also coaxially surrounded by a channel 1b, particularly when radial struts are provided between the walls of the two channels 1a, 1b. This design is not absolutely necessary.

[0039] A coupling element 2 can be inserted into the recess 1a, which is designed here with a circular cross-section. The coupling element has a first connection region 2a that fits into the recess 1a and a second connection region 2b that is designed to be connected to a drive (not shown in detail here). The second connection region is thus designed for a rotationally fixed connection to a drive, such as a coupling of the drive.

[0040] The coupling element 2 also has a shank region 2c, around which a sleeve 2d made of an elastomer, such as silicone, is arranged as an expansion element. At the free end of the first connection region 2a, the sleeve rests with its first axial end 2d1 against a force-applying surface 2e of the coupling element. The second axial end 2d2 of the sleeve 2d is free. Axial compression of the sleeve 2d, i.e., the application of a force that moves the axial ends 2d1 and 2d2 toward each other, can cause the sleeve 2d to thicken radially.

[0041] The winding system may further comprise an auxiliary element 3 which may be configured as a disc 3. The disc has an inner opening 3a which can be pushed through the second connection region 2b of the coupling element 2. The outer diameter of the disc 3 is greater than the outer diameter of the winding core 1.

[0042] In one possible embodiment, the winding system further comprises a stop ring 4 which can be embedded in the annular groove 2 f between the connection areas 2 a and 2 b of the coupling element 2 .

[0043] Figure 1 The right side of FIG. 2 shows the assembled winding system after the coupling element 2 has been inserted into the recess 1 a of the winding core 1 and the disk 3 has been pushed through the coupling element 2 and rests on the end face of the winding core 1 .

[0044] Figure 2 The assembled winding system is shown in cross-section in two states.

[0045] exist Figure 2 As can be seen on the left side, the coupling element 2 is inserted into the recess 1a of the winding core 1, while the expansion element 2d, here the sleeve 2d, has not expanded, i.e., thickened. The disk 3 rests on the end face of the winding core 1 and, preferably, already contacts the second axial end face 2d2 of the sleeve 2d in the unclamped state. To this end, the second axial end 2d2 of the sleeve lies in the plane of the winding core end face. Alternatively, the second axial end 2d2 of the sleeve can also lie below the plane of the winding core end face and not initially contact the auxiliary element.

[0046] The annular groove 2 f of the coupling element 2 is located below the surface of the disk 3 and cannot be accessed by the stop ring 4 .

[0047] The connection region 2a is located completely, but not connected, in the winding core 1. The connection region 2b is located outside the winding core 1 and is accessible for connection to a drive (not shown).

[0048] In order to fix the coupling element 2 in the winding core 1, the sleeve is expanded in the following manner, i.e., the coupling element is partially pulled out of the recess, at least until the annular groove is accessible above the disk 3. As a result, the force application surface 2e moves in the direction of the disk 3. Since the sleeve 2d is clamped between the force application surface 2e and the disk 3, the sleeve 2d is axially compressed by the movement of the force application surface 2e and thus thickens. As a result, the circumference of the sleeve 2d is pressed against the inner surface of the recess 1a, so that a force-locking connection is generated by the radial force F1, as shown in FIG. Figure 2 As shown on the right side of .

[0049] exist Figure 2 On the right side, the stop ring 4 is embedded in the annular groove 2f, so that the coupling element 2 cannot be retreated into the recess 1a again. As a result, the force F1 continues to act statically and the coupling element is fixedly fitted in the recess 1a of the winding core 1.

[0050] Furthermore, a force F2 acts, which, due to the axial compression of the sleeve 2d, pulls the coupling element 2 back into the recess 1a, but this is not possible due to the support of the retaining ring 4 on the disk 3. The force F2 therefore acts via the retaining ring 4 on the disk 3 and additionally presses it onto the end face of the winding core 1.

[0051] exist Figure 2In the right-hand expanded state, the winding core 1 can be connected to a drive on both sides in order to wind the at least one hollow fiber mat onto the winding core.

[0052] After this has been completed, the winding core can be separated from the drive, the retaining ring 4 can be removed from the respective coupling element 2 and the coupling element together with the disk 3 can be removed from the winding core 1 .

[0053] The winding core with the hollow fibers carried can then be inserted into the housing of the exchange device and the hollow fibers can thus be potted / encapsulated. The channels 1a and / or 1b in the winding core can preferably be used to convey a medium, such as blood, through the winding core.

[0054] Figure 3 The right side shows an embodiment in which, in the unexpanded state, the sleeve 2d projects with the axial end 2d2 beyond the end face of the winding core 1 after the coupling element 2 has been inserted into the winding core 1 and is thus axially compressed by the disk 3 placed as an auxiliary element, whereby the sleeve thickens and creates a force-locking connection. Figure 3 The left side shows the axial fixation of the position thus achieved by means of the stop ring 4, as in Figure 2 On the other hand, Figure 3 Corresponding to Figure 2 implementation method.

[0055] Figure 4 An alternative embodiment for securing the coupling element 2 is shown.

[0056] The coupling element 2 has an externally threaded section between the connection region 2b for connection to the drive and the axial end 2d2 of the sleeve 2d. A ring 5 or a nut 5 with a corresponding internal thread can be screwed onto this externally threaded section, for example, after the disk 3 has been pushed over the connection region 2b and rested against the end face of the winding core 1. When the ring 5 comes into contact with the disk 3 during screwing, it pulls the coupling element 2 partially out of the winding core in the axial direction, causing the sleeve 2d, which rests with its upper axial end 2d2 against the disk 3, to be axially compressed and radially expanded / thickened. This creates a non-positive connection. Figure 4 The right side shows the unexpanded state. Figure 4 The left side shows the expanded state.

[0057] Figure 5 A possible embodiment is shown, which can be selected independently of the possible expansion methods. Figure 2 Same as in . Reference Figure 5 The upper recess 1a in the winding core 1 is configured as a channel 6, which extends from the upper end face of the winding core 1 into the winding core and branches into channel sections 6a, which open into the circumference of the winding core 1. Therefore, the medium guided through the channel can flow from the radial inside to the hollow fiber. Figure 5 The left side coupling element 2 is expanded, while the right side is not expanded.

Claims

1. A winding system for winding connected hollow fibers onto a winding core (1), the winding system comprising a. a winding core (1) of an exchange device for exchanging substances and / or heat between two media, on which the coupled hollow fibers can be wound and which is arranged to be inserted into a housing of the exchange device together with the hollow fibers wound on the winding core and to remain in the housing, and b. At least one coupling element (2), which has two axially opposite connection areas (2a, 2b) and can be temporarily connected to the winding core (1) in a rotationally fixed manner with a first connection area (2a) and to a drive in a rotationally fixed manner with a second connection area (2b), by means of which the winding core (1) can be rotated about the winding axis (A), wherein: c. The first connection area (2a) of the connecting element (2) includes an expansion element, and the winding core (1) has a recess (1a) arranged around the winding axis (A) in at least one axial end face, the first connection area (2a) of the connecting element (2) can be inserted into the recess, and through the expansion of the expansion element, the winding core (1) can be connected to the connecting element (2) in a non-rotatable manner.

2. The winding system according to claim 1, characterized in that The hollow fibers are hollow fibers that are permeable to substances and / or energy.

3. The winding system according to claim 1, characterized in that The exchange device is used for material exchange and / or heat exchange between two media of the oxygenator and / or heat exchanger.

4. The winding system according to claim 1, characterized in that The winding system comprises two coupling elements (2).

5. The winding system according to claim 1, characterized in that The outer cross section of the expansion element can be enlarged by expansion.

6. The winding system according to claim 1, characterized in that The winding core (1) has recesses (1a) arranged around a winding axis (A) in both axial end faces.

7. The winding system according to claim 1, characterized in that The at least one coupling element (2) has a shank on its first connection area (2a), which is divided into at least two axially parallel shank parts in the axial direction, and a wedge-shaped element that can be moved axially between the shank parts is provided between the shank parts as an expansion element.

8. The winding system according to claim 1, characterized in that The at least one coupling element (2) has a shank on its first connection region, which has a shank section (2c), around which a sleeve (2d) made of elastic material is arranged as an expansion element, and the sleeve (2d) can change its size in the radial direction by axial movement of its annular end faces toward each other.

9. The winding system according to claim 8, characterized in that The sleeve (2d) is made of elastomer.

10. The winding system according to claim 8, characterized in that The sleeve (2d) is made of silicone rubber or natural rubber vulcanizate.

11. The winding system according to claim 8, characterized in that The sleeve (2d) can change its size in the radial direction by a force acting on the annular end face of the sleeve (2d) in the axial direction.

12. The winding system according to claim 8, characterized in that The sleeve (2d) rests with its first axial end (2d1) on a first force application surface (2e) of the coupling element (2) that is fixed in position relative to the shank section (2c), and the sleeve (2d) rests with its second axial end (2d2) on a second force application surface of the coupling element (2), the second force application surface being movable in the axial direction of the sleeve (2d) relative to the first force application surface (2e).

13. The winding system according to claim 12, characterized in that The second force application surface can be moved on the handle relative to the first force application surface (2e) by means of an operating element arranged on the coupling element (2).

14. The winding system according to claim 12, characterized in that In the expanded state, the coupling element (2) can be axially fixed relative to the winding core (1) and relative to the position of an auxiliary element (3) separated from the winding core (1), which can pass through the coupling element (2) and rest on an axial end face of the winding core (1) after the first connection area (2a) of the coupling element (2) is inserted into the recess (1a) of the winding core (1).

15. The winding system according to claim 14, characterized in that The auxiliary element (3) consists of a disk (3) which protrudes in radial direction beyond the cross section / diameter of the winding core (1).

16. The winding system according to claim 15, characterized in that By means of the disc, the hollow fiber mat can be positioned relative to the winding core (1) during winding.

17. The winding system according to claim 14, characterized in that The auxiliary element (3) forms a second force application surface for the sleeve (2d), with which the sleeve (2d) can contact with its second axial end (2d2), wherein a. the second axial end (2d2) of the sleeve (2d) facing the second connection region (2b) of the coupling element (2) protrudes beyond the axial end face of the winding core (1) when the coupling element (2) is inserted into the winding core (1) and a force can be applied to the sleeve (2d) by placing the auxiliary element (3), or b. The second axial end (2d2) of the sleeve (2d) facing the second connection area (2b) of the connecting element (2) is located below the axial end face of the winding core (1) or in the plane of the axial end face when the connecting element (2) is inserted into the winding core (1), and can cause force application / expansion through axial movement of the connecting element (2) after the auxiliary element (3) is placed.

18. The winding system according to claim 17, characterized in that The sleeve (2d) can contact the second force application surface with the end of the sleeve (2d) facing the second connection area (2b) of the coupling element (2).

19. The winding system according to claim 17, characterized in that The second axial end (2d2) of the sleeve (2d) facing the second connection area (2b) of the connecting element (2) protrudes from the axial end face of the winding core (1) when the connecting element (2) is inserted into the winding core (1) and a force can be applied to the sleeve (2d) by placing an auxiliary element (3), thereby enabling the second axial end (2d2) of the sleeve (2d) to move toward the first axial end (2d1) of the sleeve (2d).

20. The winding system according to claim 17, characterized in that The second axial end (2d2) of the sleeve (2d) facing the second connection area (2b) of the connecting element (2) is located below the axial end face of the winding core (1) or in the plane of the axial end face when the connecting element (2) is inserted into the winding core (1), and after the auxiliary element (3) is placed, a force can be applied / expanded by moving outward from the winding core (1), thereby enabling the first axial end (2d1) of the sleeve (2d) to move toward the second axial end (2d2) of the sleeve (2d).

21. The winding system according to claim 14, characterized in that The position of the coupling element (2) can be axially fixed by a stop ring (4) that can be embedded in an annular groove (2f) on the coupling element (2), and the coupling element (2) can be supported on the surface of the auxiliary element (3) by means of the stop ring.

22. The winding system according to any one of claims 1 to 13, characterized in that An operating element (5) is provided on the coupling element (2), by means of which an expansion of the expansion element in the first connection region (2a) and / or an axial fixation of the coupling element (2) can be effected.

23. The winding system according to claim 14, characterized in that An operating element (5) is provided on the connecting element (2), by means of which the expansion element in the first connection area (2a) can be expanded and / or the connecting element (2) can be axially fixed. The operating element is supported on an auxiliary element (3) or an element having a second force application surface or a supporting element provided on the connecting element (2).

24. The winding system according to claim 22, characterized in that The operating element (5) is designed as a nut on a threaded section of the coupling element (2) connected to the expansion element or as an eccentric that can be moved by means of a rod and can rotate about an axis.

25. The winding system according to any one of claims 1 to 13, characterized in that A recess (1a) in the winding core (1) for accommodating a coupling element (2) is formed by a channel which at least partially passes through the winding core (1) and can be traversed by a medium after the winding core (1) has been inserted into a housing of a substance exchange device.

26. The winding system according to claim 25, characterized in that After the winding core (1) has been inserted into the housing of the substance exchange device, blood can flow through the channel.

27. The winding system according to any one of claims 1 to 13, characterized in that A recess (1a) in the winding core for accommodating a coupling element (2) is surrounded by a channel (1b) extending at least partially coaxially with the recess (1a) and capable of being traversed by a medium after the winding core (1) has been inserted into a housing of a substance exchange device.

28. The winding system according to claim 27, characterized in that After the winding core (1) has been inserted into the housing of the substance exchange device, blood can flow through the channel.

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