Stent for placement in a hollow vessel or hollow organ of the human or animal body

Abstract

The present disclosure relates to a stent (100), in particular a ureteral stent (100), for placement in a hollow vessel or hollow organ of the human or animal body, comprising: an elongate main element (10) which is tubular, and at least two retrieval thread sections (20, 30) which are provided at one end of the elongate main element (10) and are configured for engagement with a device for extracting the stent (100), wherein a first of the at least two retrieval thread sections (20, 30) is shorter than a second of the at least two retrieval thread sections (20, 30).

Description

[0001] Stent for placement in a hollow vessel or hollow organ of the human or animal body

[0002] Description

[0003] The present disclosure relates to a stent, in particular a ureteral stent, for placement in a hollow vessel or hollow organ of the human or animal body.

[0004] background

[0005] Stents, such as ureteral stents, serve to support vessels and hollow organs so that they can fulfill their function of conveying / draining fluids such as blood or urine.

[0006] For this purpose, these stents are inserted into the vessel or hollow organ and remain there for a certain period of time, sometimes only a few weeks, but sometimes also several months, depending on the reason for this measure and the duration of the treatment (for example, due to a longer healing process).

[0007] If the stent inserted into the vessel, for example, a ureteral stent placed in a ureter, is no longer needed, it must be removed using a special instrument, such as an endoscope or an extraction catheter. When using an extraction catheter, this is achieved by advancing the catheter through the ureter to the ureteral stent, connecting it to the stent, and then withdrawing the catheter and stent together through the ureter.

[0008] For connecting the ureteral stent and the extraction catheter, the ureteral stent may have catching threads provided at the end of the ureteral stent facing the extraction catheter, and the extraction catheter may have a corresponding catching section (for example, a brush-shaped section) for capturing and wrapping the catching threads of the ureteral stent.

[0009] However, it frequently happens that the retrieval threads of the stent or ureteral stent lie against each other in the patient's body or are positioned so unfavorably in the patient's organ / vessel that capturing these threads with the extraction catheter can prove difficult if the retrieval section, for example a retrieval brush, can barely grasp the retrieval threads and therefore can only wrap itself around them with difficulty, thus creating a firm connection between the stent / ureteral stent and the extraction catheter.

[0010] In view of the disadvantages described above, and starting from the prior art described above, it is an objective of the present application to provide a stent, in particular a ureteral stent, with which the disadvantages described here are avoided.

[0011] Summary

[0012] The present disclosure relates to a stent, in particular a ureteral stent, for placement in a hollow vessel or hollow organ of the human or animal body.

[0013] In particular, to solve the aforementioned problem, a stent, especially a ureteral stent, for placement in a hollow vessel or hollow organ of the human or animal body according to claim 1 is proposed. The dependent claims relate to some exemplary preferred embodiments.

[0014] According to exemplary aspects, a stent, in particular a ureteral stent, for placement in a hollow vessel or hollow organ of the human or animal body is proposed, comprising: an elongated main element which is tubular in shape, and at least two capture thread sections which are provided at one end of the elongated main element and which are arranged to engage with a device for extracting the stent, wherein a first of the at least two capture thread sections is shorter than a second of the at least two capture thread sections.

[0015] The exemplary stent can be further developed advantageously, for example, by having the at least two capture thread sections each be loop-shaped.

[0016] The exemplary stent can be advantageously further developed, for example, by having the at least two capture thread sections connected to each other at a distance from the elongated main element.

[0017] The exemplary stent can be advantageously further developed, for example, by providing the connection of the at least two tether sections, spaced apart from the elongated main element, at the subsection of the first of the at least two tether sections that is furthest from the elongated main element.

[0018] The exemplary stent can be advantageously further developed, for example, by providing the connection of the at least two tether sections, spaced apart from the elongated main element, at the subsection of the second of the at least two tether sections that is furthest from the elongated main element.

[0019] The exemplary stent can be advantageously further developed, for example, by providing the connection of the at least two tether sections, spaced apart from the elongated main element, at the subsection of the first of the at least two tether sections and of the second of the at least two tether sections that is furthest from the elongated main element.

[0020] The exemplary stent can be further developed, for example, by arranging the at least two capture thread sections parallel to each other at their connection point, or by having the at least two capture thread sections cross over each other at their connection point.

[0021] The exemplary stent can be advantageously further developed, for example, by forming a connecting element to the connection between the first and second tethered thread sections, which is spaced apart from the elongated main element.

[0022] The exemplary stent can be further developed, for example, by arranging the at least two capture thread sections parallel to each other at one end of the elongated main element, or by having the at least two capture thread sections cross over each other at one end of the elongated main element.

[0023] The exemplary stent can be advantageously further developed, for example, by having the elongated main element have at least two thread openings at one end, wherein the first of the at least two catch thread sections is threaded through a first of the at least two thread openings, and the second of the at least two catch thread sections is threaded through a second of the at least two thread openings.

[0024] The exemplary stent can be advantageously further developed, for example, by having the at least two thread openings configured such that the first and second of the at least two capture thread sections run perpendicular to a longitudinal direction of the elongated main element through the at least two thread openings. The exemplary stent can also be advantageously further developed, for example, by having the first and second of the at least two capture thread sections loosely provided in the at least two thread openings of the elongated main element.

[0025] The exemplary stent can be advantageously further developed, for example, by forming the first and second of the at least two capture thread sections from a first one-piece thread element.

[0026] The exemplary stent can, for example, be advantageously further developed by a third and a fourth capture thread section, wherein the third and fourth capture thread sections are longer than the first capture thread section.

[0027] The exemplary stent can be further developed advantageously, for example, by having the third and fourth sections of the tethering thread formed in a loop shape.

[0028] The exemplary stent can be advantageously further developed, for example, by having the third and fourth tethered thread sections connected to each other at a distance from the elongated main element, wherein the connection of the third tethered thread section to the fourth tethered thread section, which is spaced away from the elongated main element, is provided at the subsection of the third and fourth tethered thread sections that is furthest from the elongated main element.

[0029] The exemplary stent can be advantageously further developed, for example, by the fact that the connection of the third and fourth tether sections, spaced apart from the elongated main element, is also a connection of the first and second tether sections spaced apart from the elongated main element.

[0030] The exemplary stent can be further developed, for example, by arranging the third and fourth tether sections parallel to each other at their connection point spaced apart from the elongated main element, or by having the third and fourth tether sections cross over each other at their connection point spaced apart from the elongated main element.

[0031] The exemplary stent can be advantageously further developed, for example, by arranging the first and second tethered thread sections parallel to each other at their connection point spaced apart from the elongated main element, and arranging the third and fourth tethered thread sections parallel to each other at their connection point spaced apart from the elongated main element, wherein the first and second tethered thread sections cross over the third and fourth tethered thread sections at their common connection point spaced apart from the elongated main element.

[0032] The exemplary stent can be further developed, for example, by arranging the third and fourth tether sections parallel to each other at one end of the elongated main element, or by having the third and fourth tether sections cross over each other at one end of the elongated main element.

[0033] The exemplary stent can be advantageously further developed, for example, by having the elongated main element at one end have at least a third and a fourth thread opening, wherein the third capture thread section is threaded through the third thread opening, and the fourth capture thread section is threaded through the fourth thread opening.

[0034] The exemplary stent can be further developed, for example, by designing the third and fourth thread openings in such a way that the third and fourth capture thread section runs perpendicular to a longitudinal direction of the elongated main element through the third and fourth thread openings.

[0035] The exemplary stent can be further developed, for example, by having the thread openings of the first and second capture thread sections parallel to the thread openings of the third and fourth capture thread sections, or by having the thread openings of the first and second capture thread sections arranged in a crossed orientation to the thread openings of the third and fourth capture thread sections.

[0036] The exemplary stent can be advantageously further developed, for example, by providing loose sections for the third and fourth tether threads in the respective third and fourth thread openings of the elongated main element.

[0037] The exemplary stent can be advantageously further developed, for example, by forming the third and fourth capture thread sections from a second one-piece thread element.

[0038] The exemplary stent can be advantageously further developed, for example, by manufacturing the tractor thread sections or thread elements from thermoplastic material, and / or by manufacturing the elongated main element from silicone or thermoplastic elastomer. The exemplary stent can also be advantageously further developed, for example, by designing the stent as a ureteral stent, and by having the elongated main element, in addition to openings at each end, perforations along its length.

[0039] Further aspects and their advantages, as well as advantages and more specific implementation possibilities of the aspects and features described above, are described in the following descriptions and explanations of the attached figures, which are in no way to be understood as restrictive.

[0040] Brief description of the characters

[0041] Fig. 1a shows an exemplary representation of an exemplary stent for placement in a hollow vessel or hollow organ of the human or animal body with an elongated main element and capture thread sections,

[0042] Fig. 1b shows an exemplary representation of an area of ​​the exemplary stent, which has the capture thread sections,

[0043] Fig. 2a shows an exemplary representation of the area of ​​the exemplary stent with the capture thread sections according to Fig. 1b in a sectional view,

[0044] Fig. 2b shows an exemplary detailed view of the area of ​​the exemplary stent with the capture thread sections according to Fig. 2a in a further sectional view with visible course of the capture thread sections within the elongated main element. Fig. 3 shows an exemplary representation of the capture thread sections, which are formed in one piece from a respective thread element, in an isolated view.

[0045] Fig. 4a shows an exemplary representation of the first thread element, which forms the first and second catch thread sections, in an isolated view.

[0046] Fig. 4b shows an exemplary representation of the second thread element, which forms the third and fourth catch thread sections, in an isolated view.

[0047] Fig. 5 shows two exemplary views of an exemplary end of the exemplary stent, opposite the area of ​​the stent's retaining threads, with a tapered end of the elongated main element featuring drainage openings / perforations. Detailed description of the figures and preferred embodiments

[0048] Examples and embodiments of the present disclosure are described in detail below with reference to the accompanying figures. Identical or similar elements in the figures may be designated by the same reference numerals, but sometimes they may be designated by different reference numerals.

[0049] It should be emphasized that the subject matter of the present disclosure is in no way limited or restricted to the embodiments and their features described below, but also includes modifications of the embodiments, in particular those which are covered by modifications of the features of the described examples or by combining one or more of the features of the described examples within the scope of protection of the independent claims.

[0050] Fig. 1a shows an exemplary representation of an exemplary stent 100 for placement in a hollow vessel or hollow organ of the human or animal body with an elongated main element 10 and capture thread sections 20, 30, 40, 50.

[0051] The exemplary stent 100, which may be designed, for example, as a ureteral stent 100 (e.g., with one or two circularly / arc-shaped ends or with a single or double "pigtail," see, for example, Fig. 5) and / or for placement in a hollow vessel or hollow organ of the human or animal body, may have the elongated main element 10, which may be tubular in shape. In particular, fluids such as blood or urine from the human or animal patient can be conveyed or drained through the tubular shape. The tubular shape may, for example, have a round, particularly circular, cross-section.

[0052] Furthermore, the elongated main element 10, which may, for example, be tubular, can have a completely closed wall, which may additionally have, for example, individual perforations 11 (also referred to as drainage openings 11), or it may be designed as a wire mesh (not explicitly shown here) in order to support the patient's hollow vessel / organ from the inside and thus ensure the drainage of fluids through the hollow vessel / organ. The exemplary stent 100 may also have, for example, at least two tether sections 20, 30 and 40, 50, respectively, which are provided at one end of the elongated main element 10 and which are equipped for engagement with a device for extracting the stent 100 (not explicitly shown here).

[0053] For this purpose, the at least two capture thread sections 20, 30 (for example, a first capture thread section 20 and a second capture thread section 30) can each be designed in a loop-like shape (which can also be described as loop-shaped), so that the encircling of the device for extracting the exemplary stent 100, which can be, for example, an extraction catheter, can be advantageously supported by the capture thread sections 20, 30. This allows, for example, the creation of at least a tensile-resistant connection between the device for extracting the stent 100 and the exemplary stent 100.

[0054] Furthermore, the at least two capture thread sections 20, 30 can be spaced apart from the elongated main element 10 and connected to each other (for example, connection 60 / connecting element 60), such that their respective positions relative to the elongated main element 10 are influenced by the other capture thread section 20, 30 of the at least two capture thread sections 20, 30. In particular, this can prevent the capture thread sections 20, 30 from collapsing or lying next to each other, which could potentially make it more difficult to capture the capture thread sections 20, 30 and / or to entangle the device for extracting the stent 100 with the capture thread sections 20, 30.

[0055] It should be noted here that the reference symbols 20, 30, 40, 50 used for the example thread sections 20, 30, 40, 50 are used twice, or once, but with two reference lines. This representation can be understood to mean that the thread sections with the same reference symbols can, for example, form a thread loop. Thus, a thread loop can, for example, begin and end at connection 60 / at the connecting element 60.

[0056] Furthermore, it can be seen that, for example, a first (here the first capture thread section 20) of the at least two capture thread sections 20, 30 can be shorter than a second (here the second capture thread section 30) of the at least two capture thread sections 20, 30. This combination, supplemented, for example, by the common connection 60 / by the common connecting element 60, can advantageously lead to an assisted erection of the second capture thread section 30, which the device for extracting the stent 100 can advantageously grasp / capture and thereby entangle itself with at least this (second) capture thread section 30.

[0057] This supported erection of the second catch thread section 30 by the correspondingly shorter first catch thread section 20 can also be supported, as already described, by the connecting element 60, which forms the connection 60 between the two catch thread sections 20, 30.

[0058] Furthermore, the exemplary stent 100 can have a third (here the third capture thread section 40) and a fourth (here the fourth capture thread section 50) capture thread section 40, 50, whereby the third and the fourth capture thread section 40, 50 can also be longer than the first capture thread section 20.

[0059] This allows the third and fourth tether sections 40, 50, which can also be designed in a loop shape, for example, to further support the wrapping of the device for extracting the stent 100 and thereby create, for example, an even more tensile-strength connection between the stent 100 and the device for extracting the stent 100.

[0060] For improved capture of the third and fourth capture thread sections 40, 50 by means of the device for extracting the stent 100, for example, the third and fourth capture thread sections 40, 50 can have a connection (for example, connection 60) to each other at a distance from the elongated main element 10, wherein the connection 60 of the third and fourth capture thread sections 40, 50, which is spaced apart from the elongated main element 10, can also be a connection 60 of the first and second capture thread sections 20, 30, which is spaced apart from the elongated main element 10.

[0061] This allows the first capture thread section 20, which is shorter compared to the third and fourth capture thread sections 40, 50, to again advantageously support the erection of the third and fourth capture thread sections 40, 50 and thus additionally support the capture / gripping of the third and fourth capture thread sections 40, 50 by the device for extracting the stent 100.

[0062] Furthermore, for example, the catch thread sections 20, 30, 40, 50 or the thread elements Fl / F2 (see in particular Figs. 4a and 4b) can be made of thermoplastic material (e.g., thermoplastic polyurethane, abbreviated TPU). Furthermore, the elongated main element 10 can be made of silicone or thermoplastic elastomer, for example.

[0063] As already mentioned, the stent 100 can be designed, for example, as a ureteral stent 100 (for example, with one or two circularly / arc-shaped ends or with a single or double "pigtail", see for example Fig. 5) and the elongated main element 10 can have perforations 11 along the elongated main element 10 in addition to respective openings at the respective end of the elongated, tubular main element 10.

[0064] Furthermore, the elongated main element 10 can also have markings 12 (also called graduations) which can be applied / provided at specific intervals on the elongated main element 10 (see, for example, Fig. 5) in order to provide the user (for example, the treating physician) with a visible marking / graduation when inserting the stent 100, by which they can recognize the current insertion depth of the stent 100 into the hollow vessel / hollow organ of the human or animal patient. It should be noted that typically the end of the stent 100 opposite the end of the stent 100 with the suture loops / sutures is inserted into the hollow vessel / hollow organ first, and then the stent 100 is advanced further into the hollow vessel / hollow organ.

[0065] Fig. 1b shows an exemplary representation of a region of the exemplary stent 100, which has the capture thread sections 20, 30, 40, 50.

[0066] In particular, the area of ​​the stent 100 in which the capture thread sections 20, 30, 40, 50 are provided at one end of the stent 100 will be examined in detail.

[0067] It can be seen, for example, that the first and second catch thread sections 20, 30 can be arranged parallel to each other at their connection 60 (connection point 60), which is spaced apart from the elongated main element 10 (see in particular Figs. 3 and 4a). However, it should be noted that, for example, the at least two catch thread sections 20, 30 can also cross each other at their connection 60 (connection point 60).

[0068] At the same time, it can be seen that the third and fourth catching thread sections 40, 50 can be arranged parallel to each other at their connection 60 (connection point 60) which is spaced apart from the elongated main element 10 (see in particular Figs. 3 and 4b), but the third and fourth catching thread sections 40, 50 can also cross over each other at their connection 60 (connection point 60) which is spaced apart from the elongated main element 10.

[0069] At the connection 60 / connection point 60 spaced apart from the elongated main element 10, which the catch thread sections 20, 30, 40, 50 have in common and which can be formed, for example, by the connecting element 60, the first and second catch thread sections 20, 30 can, for example, cross over with the third and fourth catch thread sections 40, 50, in particular the catch thread sections 20, 30 can be arranged essentially at right angles to the catch thread sections 40, 50. It should be noted that the crossing of the first and second catch thread sections 20, 30 to the third and fourth catch thread sections 40, 50 can also be formed at a non-perpendicular angle, for example a crossing in the angle range of 15° to 45°, 30° to 60°, or smaller angle ranges of 30° to 45° or 45° to 60° or all angle values ​​in between.

[0070] However, it can also be the case that the first and second catch thread sections 20, 30 are arranged parallel to the third and fourth catch thread sections 40, 50 at the connection 60 / connection point 60 spaced apart from the elongated main element 10.

[0071] Furthermore, it can be seen that, for example, the catch thread sections 20, 30, 40, 50 can be arranged parallel to each other at one end of the elongated main element 10.

[0072] Specifically, the at least two catch thread sections 20, 30 at one end of the elongated main element 10 can be arranged parallel to each other, or the at least two catch thread sections 20, 30 at one end of the elongated main element 10 can cross over each other.

[0073] The same applies to the catch thread sections 40, 50, wherein the third and fourth catch thread sections 40, 50 can be arranged parallel to each other at one end of the elongated main element 10, for example, or the third and fourth catch thread sections 40, 50 can cross over each other at one end of the elongated main element 10.

[0074] If the first catching thread section 20 is arranged parallel to the second catching thread section 30, and the third catching thread section 40 is arranged parallel to the fourth catching thread section 50, then at one end of the elongated main element 10, for example, at least the first and second catching thread sections 20, 30 can be arranged crossed with the third and fourth catching thread sections 40, 50.

[0075] Furthermore, it should be noted that the connecting element 60 can, for example, be a lens-shaped or spherical plastic element which can create the crossed or parallel connection (for example as a material and / or form-fitting connection) of the catch thread sections 20, 30, 40, 50 by a thermal process or another joining process (for example by means of an adhesive process; for example using solvent or adhesive).

[0076] Fig. 2a shows an exemplary representation of the area of ​​the exemplary stent 100 with the capture thread sections 20, 30, 40, 50 according to Fig. 1b in a sectional view.

[0077] It should be clearly shown once again that, for example, the first and second catch thread sections 20, 30 can cross over with the third and fourth catch thread sections 40, 50 in the area of ​​the connection 60 / connection point 60, which can be formed, for example, by the connecting element 60, while the catch thread sections 20, 30, 40, 50 can be arranged parallel to each other at one end of the elongated main element 10.

[0078] This combination of a crossed arrangement of the catching thread sections 20, 30, 40, 50 in the area of ​​the connection 60 / connection point 60 and a parallel arrangement of the catching thread sections at one end of the elongated main element 10 can further support the erection of the third and fourth catching thread sections 40, 50 by the shorter first catching thread section 20 and thus advantageously support the capture / gripping of the catching thread sections 20, 30, 40, 50 by means of the device for extracting the stent 100.

[0079] It should also be noted that the crossing of the first and second catch thread sections 20, 30 with the third and fourth catch thread sections 40, 50 can also be reversed, i.e., provided at one end of the elongated element 10, and, for example, the parallel arrangement of the catch thread sections 20, 30, 40, 50 in the area of ​​the connection 60 / connection point 60 can be provided.

[0080] For the thread openings 10a, 10b, 10c, and 10d of the elongated main element 10, reference is made to Fig. 2b. Fig. 2b shows an exemplary detailed view of the area of ​​the exemplary stent 100 with the capture thread sections 20, 30, and 40 (here without the capture thread section 50 visible) according to Fig. 2a in a further sectional view with the visible course of the capture thread sections 20 and 40 within the elongated main element 10, whereby the thread openings 10b and 10d are not shown specifically here, but they can be designed analogously to the respective thread openings 10a and 10c.

[0081] For example, the elongated main element 10 can have at least two thread openings 10a, 10b at one end, wherein the first (here the first catch thread section 20) of the at least two catch thread sections 20, 30 can be threaded through a first (here first thread opening 10a) of the at least two thread openings 10a, 10b, and the second (here catch thread section 30) of the at least two catch thread sections 20, 30 can be threaded through a second (here second thread opening 10b) of the at least two thread openings 10a, 10b.

[0082] Furthermore, it can be seen that, for example, the at least two thread openings 10a, 10b can be advantageously designed in such a way that the first and the second of the at least two catch thread sections 20, 30 can run perpendicular to a longitudinal direction of the elongated main element 10 through the at least two thread openings 10a, 10b.

[0083] Furthermore, for example, the first and the second of the at least two catch thread sections 20, 30 can be loosely provided in the at least two thread openings 10a, 10b of the elongated main element 10. This advantageously allows the catch thread sections 20, 30 to be movable along their longitudinal direction through the thread openings 10a, 10b and to be rotatable about their longitudinal axis in the region of the thread openings 10a, 10b.

[0084] For the third and fourth catch thread section 40, 50, the elongated main element 10 can, for example, have at least a third (here the third thread opening 10c) and a fourth (here the fourth thread opening lOd) thread opening 10c, lOd at one end, wherein, for example, the third catch thread section 40 can be threaded through the third thread opening 10c, and, for example, the fourth catch thread section 50 can be threaded through the fourth thread opening lOd.

[0085] The third and fourth thread openings 10c, lOd can also be designed such that the third and fourth catch thread section 40, 50 can run perpendicular to a longitudinal direction of the elongated main element 10 through the third and fourth thread openings 10c, lOd.

[0086] For example, the thread openings 10a, 10b of the first and second catch thread section 20, 30 can be formed parallel to the thread openings 10c, lOd of the third and fourth catch thread section 40, 50, or the thread openings 10a, 10b of the first and second catch thread section 20, 30 can be formed in a crossed orientation to the thread openings 10c, lOd of the third and fourth catch thread section 40, 50.

[0087] Similar to the first and second catch thread sections 20, 30, for example the third and fourth catch thread sections 40, 50 can be provided loosely in the respective third and fourth thread openings 10c, lOd of the elongated main element 10, so that the catch thread sections 40, 50 are movable along their longitudinal direction through the thread openings 10c, lOd and rotatable about their longitudinal axis in the area of ​​the thread openings 10c, lOd.

[0088] As an alternative to loosely threading the tether sections 20, 30, 40, 50 through the thread openings 10a, 10b, 10c, 10d, the tether sections 20, 30, 40, 50 can also be bonded to the elongated main element 10 (for example, by welding). This would eliminate the mobility of the tether sections 20, 30, 40, 50 relative to the elongated main element 10, but would allow, for example, the individual lengths of the individual tether sections 20, 30, 40, 50 to be kept constant, even after the application of the exemplary stent 100 in the patient's body.

[0089] Furthermore, as can be seen in Fig. 2b, in the area of ​​the connection 60, which can be formed here by way of example by the connecting element 60, the intersecting catch thread sections 20, 30, 40, 50 are provided in a recess of the connecting element 60. Furthermore, the catch thread sections 20, 30 can be provided in the recess of the connecting element 60 such that they lie on top of each other (in direct contact) with the catch thread sections 40, 50 within the recess of the connecting element 60. The same is possible if the catch thread sections 20, 30, 40, 50 are provided parallel to each other in the recess of the connecting element 60.

[0090] Fig. 3 shows an exemplary representation of the catch thread sections 20, 30, 40, 50, which are formed in one piece from a respective thread element Fl, F2, in an isolated view. The connection 60 (here provided in area B) of the at least two catch thread sections 20, 30, which is spaced apart from the elongated main element 10, can be provided at the subsection 21 of the first (here the first catch thread section 20) of the at least two catch thread sections 20, 30 that is furthest from the elongated main element 10.

[0091] Furthermore, the connection 60 (here provided in area B) of the at least two catch thread sections 20, 30, which is spaced apart from the elongated main element 10, can be provided at the subsection 31 of the second (here the second catch thread section 30) of the at least two catch thread sections 20, 30, which is furthest away from the elongated main element 10.

[0092] In the present example, it is shown that, by way of example, the connection 60 of the at least two catch thread sections 20, 30, which is spaced apart from the elongated main element 10, can each be provided at the subsection 21, 31 of the first of the at least two catch thread sections 20, 30 and of the second of the at least two catch thread sections 20, 30 that is furthest away from the elongated main element 10.

[0093] The same can apply to the connection 60 of the catch thread sections 40, 50, wherein the third and the fourth catch thread section 40, 50 can have a connection 60 (also provided here in area B) with each other at a distance from the elongated main element 10, wherein the connection 60 of the third catch thread section 40 with the fourth catch thread section 50, which is spaced from the elongated main element 10, can each be provided at the subsection 41, 51 of the third and the fourth catch thread section 40, 50 that is furthest from the elongated main element 10.

[0094] In the example shown here of the connection 60 in area B, the connecting element 60, as shown so far, can also be omitted and instead the catch thread sections 20, 30, 40, 50 can be directly connected to each other at their respective subsections 21, 31, 41, 51 (here, by way of example, the respective first subsections 21, 31, 41, 51) (for example, by a thermal process, such as welding, or another process, such as gluing).

[0095] Furthermore, it is shown by way of example that the catch thread sections 20, 30, 40, 50 can also have second subsections 22, 32, 42, 52, which are provided at one end of the elongated main element 10 (not shown specifically here, but provided in area A) and may be located / provided for example in the respective thread openings 10a, 10b, 10c, 10d of the elongated main element 10.

[0096] Fig. 4a shows an exemplary representation of the first thread element Fl, which forms the first and second catch thread section 20, 30, in an isolated view.

[0097] The first 20 and the second 30 of the at least two catch thread sections 20, 30 can be formed from the first one-piece thread element Fl and this first thread element Fl can be laid in such a loop-like shape or threaded through the elongated main element 10 that, for example, starting from the connection 60 (including the first subsections 21, 31), a loop 20-20 (the two catch thread sections 20 shown here form, for example, a loop together) of the first catch thread section 20 and a loop 30-30 (the two catch thread sections 30 shown here form, for example, a loop together) of the second catch thread section 30 can be formed.

[0098] In addition, for example, the loop 30-30 can be longer or shorter than the loops formed by the catch thread sections 40 and / or 50.

[0099] Fig. 4b shows an exemplary representation of the second thread element F2, which forms the third and fourth catch thread sections 40, 50, in an isolated view.

[0100] The third and fourth catch thread sections 40, 50 can be formed from a second one-piece thread element F2, and this second thread element F2 can be laid in such a loop-like shape or threaded through the elongated main element 10 that, for example, starting from the connection 60 (including the first subsections 41, 51), a loop 40-40 (the two catch thread sections 40 shown here form, for example, a loop together) of the third catch thread section 40 and a loop 50-50 (the two catch thread sections 50 shown here form, for example, a loop together) of the fourth catch thread section 50 can be formed.

[0101] Furthermore, loop 40-40 can be longer or shorter than loop 30-30, or loop 50-50 can be shorter or longer than loop 30-30. Figure 5 shows two exemplary representations (representation a) and representation b)) of an exemplary end of the exemplary stent 100, which is opposite the area of ​​the tether threads Fl, F2 or the tether thread sections 20, 30, 40, 50 of the exemplary stent 100, with a tapered end 15 of the elongated main element 10 with drainage openings 11 / perforations 11.

[0102] The end of the elongated main element 10 of the stent 100, which is opposite the capture thread sections 20, 30, 40, 50 or the thread elements Fl, F2, can, for example, be arranged in an arc or circle shape (also referred to as a "pigtail"), so that the exemplary stent 100, if it is designed, for example, as a ureteral stent 100, can advantageously be inserted into the renal pelvis of the kidney of a patient and fixed therein with the circularly / arc-shaped end.

[0103] To facilitate the insertion of the stent 100, which is designed as a ureteral stent 100, the end which is inserted first into the hollow vessel / hollow organ of the patient can be a conically shaped end 15, so that the advancement of the stent 100 through the vessels / organs of the patient to the desired location can take place more easily or with less resistance and therefore also with less tissue irritation.

[0104] To make the advancement and thus the position of the stent 100 within the patient more easily verifiable for the user (e.g., treating physician), the stent 100 or the ureteral stent 100 can, for example, have markings / gradations 12 that are applied at regular intervals on the outside of the elongated main element 10 of the stent 100 and differ in their respective design (e.g., an increasing number of closely spaced line markings, whereby the number of lines per marking 12 increases with increasing distance to the conical end 15 of the stent 100, for example), so that the positioning remains verifiable for the user at all times.

[0105] The perforations 11 shown of the elongated main element 10 can, using the example of a ureteral stent 100, now direct the urine accumulating in the kidney into the interior of the tubular, elongated main element 10 and, for example, direct the urine towards the end of the stent 100, which has the catching thread sections 20, 30, 40, 50, and thus, for example, into the patient's bladder.

[0106] It should be noted that only examples and embodiments of the present disclosure, as well as technical advantages, have been described in detail above with reference to the accompanying figures. However, the present disclosure is in no way limited or restricted to the embodiments and their features or combinations described above, but also includes modifications of these embodiments, in particular those resulting from modifications of the features of the described examples or from combinations or partial combinations of one or more of the features of the described examples within the scope of protection of the independent claims.

[0107] Reference symbol list

[0108] 10 elongated main element

[0109] 10a first thread opening of the elongated main element

[0110] 10b second thread opening of the elongated main element

[0111] 10c third thread opening of the elongated main element

[0112] lOd fourth thread opening of the elongated main element

[0113] 11 Perforation of the elongated main element / drainage opening

[0114] 12 Marking / Graduation on the elongated main element

[0115] 15 conical end of the elongated main element

[0116] 20 first section of the catching thread

[0117] 21 first subsection of the first catch thread section

[0118] 22 second subsection of the first catch thread section

[0119] 30 second section of the catch thread

[0120] 31 first subsection of the second catch thread section

[0121] 32 second subsection of the second catch thread section

[0122] 40 third section of the catching thread

[0123] 41 first subsection of the third catch thread section

[0124] 42 second subsection of the third section of the catching thread

[0125] 50 fourth section of the fishing line

[0126] 51 first subsection of the fourth section of the catching thread

[0127] 52 second subsection of the fourth section of the catching thread

[0128] 60 Connection / Connection point / Connecting element 100 Stent / Ureteral stent

[0129] A area of ​​one end of the stent

[0130] B area of ​​the connection

[0131] Fl first thread element / first catch thread F2 second thread element / second catch thread

Claims

Patent claims 1. Stent, in particular ureteral stent, for placement in a hollow vessel or hollow organ of the human or animal body, comprising: - an elongated main element that is tubular in shape, and - at least two capture thread sections provided at one end of the elongated main element and designed to engage with a device for extracting the stent, wherein a first of the at least two catch thread sections is shorter than a second of the at least two catch thread sections.

2. Stent according to claim 1, wherein which each have at least two loop-shaped sections of the catching thread.

3. Stent according to claim 1 or 2, wherein which have at least two sections of the catching thread spaced apart from the elongated main element and connected to each other.

4. Stent according to claim 3, wherein The connection of the at least two catch thread sections, spaced apart from the elongated main element, is provided at the subsection of the first of the at least two catch thread sections that is furthest away from the elongated main element.

5. Stent according to claim 3, wherein The connection of the at least two catch thread sections, spaced apart from the elongated main element, is provided at the subsection of the second of the at least two catch thread sections that is furthest away from the elongated main element.

6. Stent according to claim 3, wherein The connection of the at least two catch thread sections, spaced apart from the elongated main element, is provided at the subsection of the first of the at least two catch thread sections and of the second of the at least two catch thread sections that is furthest from the elongated main element.

7. Stent according to any one of claims 3 to 6, wherein which at least two sections of the catching thread are arranged parallel to each other at their connection point, or The two sections of the catching thread cross over each other at their point of connection.

8. Stent according to any one of claims 3 to 7, wherein The connection between the first and second sections of the catching thread, spaced apart from the elongated main element, is formed by a connecting element.

9. Stent according to any of the preceding claims, wherein which at least two catch thread sections are arranged parallel to each other at one end of the elongated main element, or The at least two sections of the catching thread cross over each other at one end of the elongated main element.

10. Stent according to claim 9, wherein the elongated main element has at least two thread openings at one end, wherein the first of the at least two catch thread sections is threaded through a first of the at least two thread openings, and through a second of the at least two thread openings, the second of the at least two catch thread sections is threaded through.

11. Stent according to claim 10, wherein the at least two thread openings are designed such that the first and the second of the at least two catch thread sections run perpendicular to a longitudinal direction of the elongated main element through the at least two thread openings.

12. Stent according to claim 10 or 11, wherein the first and the second of the at least two catch thread sections are loosely provided in the at least two thread openings of the elongated main element.

13. Stent according to any of the foregoing claims, wherein the first and the second of which at least two catch thread sections are formed from a first one-piece thread element.

14. Stent according to any of the foregoing claims, further comprising: - a third and a fourth section of the catching thread, where the third and fourth trapping thread sections are longer than the first trapping thread section.

15. Stent according to claim 14, wherein the third and fourth sections of the catching thread are loop-shaped.

16. Stent according to claim 14 or 15, wherein The third and fourth catching thread sections have a connection to each other spaced apart from the elongated main element, wherein the connection of the third catching thread section to the fourth catching thread section, spaced apart from the elongated main element, is provided at the subsection of the third and fourth catching thread sections that is furthest away from the elongated main element.

17. Stent according to claim 16, wherein The connection of the third and fourth catch thread sections, spaced apart from the elongated main element, is also a connection of the first and second catch thread sections, spaced apart from the elongated main element.

18. Stent according to claim 16 or 17, wherein the third and fourth sections of the catching thread are arranged parallel to each other at their connection point, which is spaced apart from the elongated main element, or the third and fourth sections of the catching thread cross over each other at their connection point, which is spaced apart from the elongated main element.

19. Stent according to claims 7 and 18, wherein the first and second catch thread sections are arranged parallel to each other at their connection point spaced apart from the elongated main element, and the third and fourth catch thread sections are arranged parallel to each other at their connection point spaced apart from the elongated main element, wherein the first and second catch thread sections cross over the third and fourth catch thread sections at their common connection point, which is spaced apart from the elongated main element.

20. Stent according to one of claims 14 to 19, wherein the third and fourth sections of the catching thread are arranged parallel to each other at one end of the elongated main element, or The third and fourth sections of the catching thread cross over each other at one end of the elongated main element.

21. Stent according to claim 20, wherein the elongated main element has at least a third and a fourth thread opening at one end, the third section of the catch thread is threaded through the third thread opening, and The fourth section of the catch thread is threaded through the fourth thread opening.

22. Stent according to claim 21, wherein The third and fourth thread openings are designed such that the third and fourth catch thread section runs perpendicular to a longitudinal direction of the elongated main element through the third and fourth thread openings.

23. Stent according to claims 11 and 22, wherein the thread openings of the first and second catch thread sections are formed parallel to the thread openings of the third and fourth catch thread sections, or the thread openings of the first and second catch thread sections are formed in a crossed orientation to the thread openings of the third and fourth catch thread sections.

24. Stent according to one of claims 21 to 23, wherein the third and fourth catch thread sections are loosely provided in the respective third and fourth thread openings of the elongated main element.

25. Stent according to any one of claims 14 to 24, wherein the third and fourth sections of the catching thread are formed from a second one-piece thread element.

26. Stent according to any of the foregoing claims, wherein the catch thread sections or thread elements are made of thermoplastic material, and / or The elongated main element is made of silicone or thermoplastic elastomer.

27. Stent according to any of the preceding claims, wherein the stent is designed as a ureteral stent, and The elongated main element, in addition to openings at each end of the tubular main element, has perforations along its length.

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