Device for extracting a stent

Abstract

The invention relates to a device (1000) for extracting a stent, in particular a ureteral stent, comprising: a casing portion (199) which is tubular and is connected, at a first end, to a handle portion (300) and has an opening (110) at the second end opposite the handle portion (300); and a catching element (200) which can be moved at least translationally in the casing portion (100) in the longitudinal direction of the casing portion (100) and has a catching portion (210) at the end thereof facing the opening (110) of the casing portion (100), the catching portion being designed to be brought into engagement with the stent. The catching portion (210) is designed in such a way that, after the catching portion (210) has been pushed out of the casing portion (100), the catching portion (210) can be folded down with respect to the rest of the catching element (200).

Description

[0001] Device for extracting a stent

[0002] Description

[0003] The present disclosure relates to a device for extracting a stent, in particular for extracting a ureteral stent.

[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 a stent inserted into a vessel, such as a ureteral stent, 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, when using previously known extraction catheters, it frequently occurs that the retention section does not connect securely enough to the ureteral stent. In light of the disadvantages described above, and building upon the prior art described above, the present application aims to provide a device for stent extraction that avoids these disadvantages.

[0010] Summary

[0011] The present disclosure relates to a device for extracting a stent, in particular for extracting a ureteral stent.

[0012] In particular, to solve the aforementioned problem, a device for extracting a stent, especially a ureteral stent, according to claim 1 is proposed. The dependent claims relate to some exemplary preferred embodiments.

[0013] According to exemplary aspects, a device for extracting a stent, in particular a ureteral stent, is proposed, comprising: a sheath section which is tubular in shape and is connected at its first end to a handle section and has an opening at its second end opposite the handle section; and a retrieval element which is movable at least translationally in the longitudinal direction of the sheath section and has a retrieval section at its end facing the opening of the sheath section which is configured to engage with the stent; wherein the retrieval section is designed such that, after the retrieval section is pushed out of the sheath section, the retrieval section can be folded down relative to the rest of the retrieval element.

[0014] The exemplary device can be advantageously further developed by having the catching element a guide section that extends from the catching section towards the handle section, and by having the catching section rotatably mounted relative to the guide section for folding down.

[0015] The exemplary device can be advantageously further developed by the fact that the capture section and the guide section each have a projecting section for forming the rotatable bearing, wherein the projecting section of the capture section, which projects in the direction of the guide section, and the projecting section of the guide section, which projects in the direction of the capture section, are connected to each other by a pin-shaped element.

[0016] The exemplary device can be advantageously further developed by the fact that the forward section of the guide section is formed by two forward subsections and the forward section of the catch section is provided between the two forward subsections of the guide section, wherein the two forward subsections of the guide section and the forward section of the catch section are connected to each other by the pin-shaped element.

[0017] The exemplary device can be advantageously further developed by the fact that the forward section of the trapping section is formed by two forward subsections and the forward section of the guide section is provided between the two forward subsections of the trapping section, wherein the two forward subsections of the trapping section and the forward section of the guide section are connected to each other by the pin-shaped element.

[0018] The exemplary device can be advantageously further developed by making the protruding section of the catch section and / or the protruding section of the guide section rotatable relative to the pin-shaped element.

[0019] The exemplary device can be advantageously further developed by making the catching element rotatably movable in the sheath section.

[0020] The exemplary device can be advantageously further developed by the fact that the capture section has an elongated capture projection retaining section with a longitudinal direction which, in the unfolded state of the capture section, is parallel to the longitudinal direction of the sheath section, wherein at least one capture projection is formed on the capture projection retaining section radial to the longitudinal direction of the capture projection retaining section, which is designed to engage with the stent, in particular with capture threads of the stent.

[0021] The exemplary device can be advantageously further developed by having at least one catching projection in a hook shape, particularly a C-hook shape, with the opening of the hook shape oriented towards the guide section. The exemplary device can be further advantageously developed by having the catching section have a plurality of catching projections, preferably eight to ten catching projections, and particularly preferably twelve to fourteen catching projections.

[0022] The exemplary device can be advantageously further developed by forming the plurality of catch projections in pairs on the catch projection holding section, wherein two catch projections forming a pair are diametrically opposed to each other and offset in the longitudinal direction of the catch projection holding section with respect to the catch projection holding section.

[0023] The exemplary device can be advantageously further developed by having the multitude of catch projections, viewed in the longitudinal direction of the catch projection holding section, have an angle between them.

[0024] The exemplary device can be advantageously further developed by having a pair of catch projections have an angle in the range of 30° - 65°, particularly preferably 50° - 55°, to their respective adjacent pair of catch projections, wherein in particular the same angle is formed between the individual pairs of catch projections.

[0025] The exemplary device can be advantageously further developed by arranging the pairs of catch projections offset along the longitudinal direction of the catch projection holding section on the catch projection holding section.

[0026] The exemplary device can be advantageously further developed by ensuring that the angle between the individual pairs of catch projections has the same orientation from pair to pair, so that the catch projections are arranged in a double spiral shape on the catch projection holding section.

[0027] The exemplary device can be advantageously further developed by having the capture section be brush-shaped so that it can be brought into engagement with the stent, in particular with the stent's capture threads.

[0028] The exemplary device can be advantageously further developed by the fact that the catching element also has a coupling section which is designed to decouple the catching section from the rest of the catching element.

[0029] The exemplary device can be advantageously further developed by designing the coupling section as a releasable, positive-locking connection. The exemplary device can be further developed by the coupling section having at least two coupling parts that positively interlock, wherein a first coupling part is connected to the catch section and a second coupling part is connected to the remaining catch element, and the coupling section further comprising at least one locking element that is configured to be guided through the at least two coupling parts and thereby secure the positive-locking connection and, when the locking element is pulled out of at least the first coupling part, to unlock the positive-locking connection of the at least two coupling parts.

[0030] The exemplary device can be advantageously further developed by the fact that the first coupling part has at least a first positive-locking contact with the second coupling part in the longitudinal direction of a guide section of the catching element and at least a second positive-locking contact transverse to the longitudinal direction of the guide section of the catching element, wherein the guide section extends from the catching section in the direction of the grip section.

[0031] The exemplary device can be advantageously further developed by designing the locking element as a wire-shaped element which, when passed through the at least two coupling parts, blocks the loosening of the positive locking connection.

[0032] The exemplary device can be advantageously further developed by making the coupling section operable from the handle section.

[0033] The exemplary device can be advantageously further developed by making the coupling section operable from the handle section by pulling the wire-shaped element using a handle element of the handle section in such a way that the catching section is decoupled from the rest of the catching element when actuated.

[0034] 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 exhaustive. Brief description of the figures

[0035] Fig. 1a shows an exemplary representation of an exemplary device for extracting a stent, in which the capture section of the capture element has not yet been pushed out of the outer section of the device.

[0036] Fig. 1b shows an exemplary representation of the catching element with catching section, as it is located in the outer shell section of the device, as long as the catching section has not yet been pushed out of the outer shell section.

[0037] Fig. 2a shows an exemplary representation of the capture element with capture section according to Fig.

[0038] lb in the sectional view with rotatable mounting of the catch section relative to the rest of the catch element,

[0039] Fig. 2b shows an exemplary detailed view of the rotatable bearing of the catch section and parts of the coupling section of the catch element according to Fig. 2a.

[0040] Fig. 3 shows an exemplary representation of the catch element with catch section, wherein the catch section is now pushed out of the shell section.

[0041] Fig. 4 shows an exemplary representation of the coupling section of the catch element with the wire-shaped element as a locking part to secure the connection of the at least two coupling parts to each other.

[0042] Fig. 5 shows two exemplary representations of the coupling section, the first exemplary representation showing the joining of the at least two coupling parts and the second exemplary representation showing the passage of the wire-shaped element through the second coupling part.

[0043] Fig. 6 shows two exemplary representations of the trapping section, the first exemplary representation showing the raw part for formation into the trapping section and the second exemplary representation showing the trapping section formed by rotating the raw part about its longitudinal axis.

[0044] Fig. 7 shows an exemplary detailed view of the catch section in sectional view with an exemplary rotation angle between the individual pairs of catch projections. Detailed description of the figures and preferred embodiments

[0045] 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.

[0046] 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.

[0047] Fig. 1a shows an exemplary representation of an exemplary device 1000 for the extraction of a stent, for example a ureteral stent (not shown here), in which the capture section 210 (not shown here, see Fig. 1b) of the capture element 200 has not yet been pushed out of the sheath section 100 of the device 1000.

[0048] The exemplary device 1000, in addition to the catching element 200 and the casing section 100, has a handle section 300 by means of which the user can operate or control the exemplary device 1000. In particular, the catching section 210 can be pushed out of the casing section 100 towards the opening 110 of the casing section 100 via the handle section 300 (not shown here, see for example Fig. 3).

[0049] Furthermore, the gripping section 210 or the gripping element 200 can be rotated by means of the handle section 300 about the longitudinal axis of the gripping element 200 or about the longitudinal axis of the sheath section 100, in particular about the longitudinal axis of the sheath section 100 in the area of ​​the opening 110 of the sheath section 100, which is located at the end of the sheath section 100 opposite the handle section 300.

[0050] Furthermore, the handle section 300 can have a handle element 301 which, when actuated, is designed to release / decouple the coupling 220 or the coupling section 220 (see in particular Figures 1b, 4 and 5) between the retaining section 210 and the remaining retaining element 200. This advantageously allows the user, in the event of an unforeseen problem during stent removal, for example, a ureteral stent becoming lodged in a ureter due to encrustation, to release the retaining section 210 from the remaining retaining element 200 and thus remove at least the device 1000 (except for the retaining section 210 remaining in the patient) from the ureter or from the patient.

[0051] Fig. 1b shows an exemplary representation of the capture element 200 with capture section 210, as it is located in the shell section 100 of the device 1000, as long as the capture section 210 has not yet been pushed out of the shell section 100.

[0052] It should first be noted that, for the sake of simplicity in illustrating the position of the trap section 210 or the trap element 200 within the shell section 100, the shell section 100 has been omitted in Fig. 1b or is simply not visible.

[0053] The capture section 210 can have an elongated capture projection retaining section 212 with a longitudinal direction which, in the shown unfolded state of the capture section 210, is parallel to the longitudinal direction of the sheath section 100 (see Fig. 1a), wherein at least one capture projection 211 or 211a / 211b is formed radially to the longitudinal direction of the capture projection retaining section 212 on the capture projection retaining section 212, which is designed to engage with a stent, for example a ureteral stent.

[0054] For example, the at least one grasping projection 211 or 211a / 211b provided on the grasping projection retaining section 212 can be configured to engage with the stent's retaining sutures or with the tracting sutures of the exemplary ureteral stent. This can be particularly advantageous if the at least one grasping projection 211 or 211a / 211b is hook-shaped, especially C-hook-shaped, with, for example, the opening of the hook shape oriented towards the guide section 230 or, in the still-retracted state of the grasping section 210, towards the remaining grasping element 200. This can advantageously facilitate the entanglement of the exemplary stent / ureteral stent retaining sutures with the at least one grasping projection 211 or 211a / 211b of the grasping section 210.

[0055] Furthermore, the entanglement / engagement of the stent / ureteral stent's grasping threads with the grasping section 210 can be facilitated by the grasping section 210 having a plurality of grasping projections 211 or 211a / 211b. For this purpose, eight to ten grasping projections 211 or 211a / 211b, and in particular twelve to fourteen grasping projections 211 or 211a / 211b, may prove advantageous. However, for the sake of completeness, it should be noted that in addition to the aforementioned number of possible grasping projections 211 / 211a / 211b, a different number of grasping projections 211 / 211a / 211b may also be advantageous, for example, generally an even number such as two, four, six, eight, etc., or also an odd number such as three, five, seven, nine, etc.

[0056] The trapping section 210 can also include the multitude of trapping projections 211 or 211.

[0057] 211a / 211b are designed such that they are formed in pairs on the catch projection retaining section 212, wherein two catch projections 211a and 211b, which form a pair 211a / 211b, are formed diametrically opposite each other with respect to the catch projection retaining section 212 and offset in the longitudinal direction of the catch projection retaining section 212 (see in particular Fig. 6).

[0058] Furthermore, the plurality of catch projections 211 or 211a / 211b, viewed in the longitudinal direction of the catch projection retaining section 212, can have an angle α or rotation angle α (see in particular Fig. 7) between them. In particular, a pair of catch projections 211a / 211b can have an angle α in the range of 30° - 65°, particularly preferably 50° - 55°, with respect to their respective adjacent pair of catch projections 211a / 211b (see also in particular Fig. 7), wherein in particular the same angle α can be formed between each of the individual pairs of catch projections 211a / 211b. It should be noted at this point that, in addition to the values ​​of angle a mentioned here, other values ​​may also be provided, for example 15°, 20°, 25°, 35°, 40°, 45°, 60°, 70°, 75° and all intermediate and below or above values ​​of angle a.

[0059] Furthermore, the pairs of catch projections 211a / 211b can be arranged offset along the longitudinal direction of the catch projection retaining section 212 on the catch projection retaining section 212, wherein in particular the angle a between the individual pairs of catch projections 211a / 211b can have the same orientation from pair to pair, so that the catch projections 211a / 211b can be arranged in a double spiral shape on the catch projection retaining section 212.

[0060] Furthermore, the grasping section 210 can be brush-shaped so that it can engage with the stent, for example, a ureteral stent, and in particular with the stent / ureteral stent's retaining threads. The brush shape also advantageously facilitates the entanglement of the stent / ureteral stent's retaining threads with the grasping section 210 of the grasping element 200.

[0061] In addition to the catch section 210, the catch element 200 can have the aforementioned guide section 230, which extends from the catch section 210 towards the handle section 300 (see Fig. 1a), and the catch section 210 can be rotatably mounted relative to the guide section 230 for folding down.

[0062] The trap section 210 and the guide section 230 can each have a projecting section 218 and 231 (projecting section 218 of the trap section 210, projecting section 231 of the guide section 230) to form the rotatable bearing, wherein the projecting section 218 of the trap section 210, which projects in the direction of the guide section 230, and the projecting section 231 of the guide section 230, which projects in the direction of the trap section 210, can be connected to each other by a pin-shaped element 235.

[0063] This pin-shaped element 235 can, for example, be a pin 235 comprising or consisting of plastic, which is inserted into the preceding section 218 of the catch section 210 and into the preceding section 231 of the guide section 230 and can, for example, be connected to one of the two preceding sections 218 / 231 by means of a material bond (for example, by thermal bonding).

[0064] Furthermore, the preceding section 231 of the guide section 230 can be formed by two preceding subsections 231a / 231b and the preceding section 218 of the trap section 210 can be provided between the two preceding subsections 231a / 231b of the guide section 230, wherein the two preceding subsections 231a / 231b of the guide section 230 and the preceding section 218 of the trap section 210 can be connected to each other by the pin-shaped element 235, as already described above.

[0065] Alternatively, the preceding section 218 of the trapping section 210 can also be formed by two preceding subsections 218a / 218b (not shown separately here, but by analogy to the two subsections 231a / 231b of the guide section 230), and the preceding section 231 of the guide section 230 can be provided between the two preceding subsections 218a / 218b of the trapping section 210, wherein the two preceding subsections 218a / 218b of the trapping section 210 and the preceding section 231 of the guide section 230 can be connected to each other by the pin-shaped element 235, as already described above.

[0066] Advantageously, in all the described cases, the preceding section 218 of the catch section 210 and / or the preceding section 231 (231a / 231b) of the guide section 230 can be designed to be rotatable relative to the pin-shaped element 235. This can be achieved, for example, by providing the pin-shaped element 235 with some play in the respective preceding section 218 / 231.

[0067] Furthermore, the catching element 200 of the exemplary device 1000 can have a coupling section 220, which is formed, for example, from a first coupling part 221 and a second coupling part 222 and which is configured to decouple the catching section 210 (and, for example, also the guide section 230) from the rest of the catching element 200, with reference being made, for example, to the description of Figs. 2a, 2b, 4 and 5 for further details on the coupling section 220.

[0068] Fig. 2a shows an exemplary representation of the catch element 200 with catch section 210 according to Fig. 1b in sectional view with rotatable bearing of the catch section 210 relative to the rest of the catch element 200.

[0069] The internal structure of the catch element 200 in the area of ​​the guide section 230 and the coupling section 220 is shown, wherein, as already described, a pin-shaped element 235 is provided in contact with the preceding sections 218 and 231 (231a / 231b) of the catch section 210 and the guide section 230 to form the rotatable bearing of the catch section 210 relative to the guide section 230 or relative to the rest of the catch element 200, wherein at least one of the preceding sections 218 / 231 can be rotatable relative to the pin-shaped element 235 so that the catch section 210 is rotatable relative to the guide section 230.

[0070] Furthermore, the coupling section 220 has a longitudinally extending recess 223, essentially in the region of its longitudinal axis. This recess 223 can, for example, be designed as a cylindrical recess 223 and extends, for example, completely through the second coupling part 222 and at least partially through the first coupling part 221 in the longitudinal direction of the coupling section 220. This recess 223 can, for example, be configured to receive at least one locking element 225 (not shown here, see Figures 4 and 5), in particular at least one wire-shaped locking element 225 or at least one locking element 225 designed as a wire-shaped element 225. By inserting the locking element 225 into the coupling section 220, the coupling section 220 can be secured.the connection of the first coupling part 221 with the second coupling part 222 is secured and when the locking part 225 is removed, at least from the first coupling part 221 (for example by pulling the locking part 225 out of the recess 223) the connection of the first coupling part 221 with the second coupling part 222 is released and thereby the catch section 210 (and for example the guide section 230) is decoupled from the rest of the catch element 200.

[0071] Fig. 2b shows an exemplary detailed view of the rotatable bearing of the catch section 210 and parts of the coupling section 220 of the catch element 200 according to Fig.

[0072] 2a.

[0073] The coupling section 220, which can be formed from the first coupling part 221 and the second coupling part 222, can be designed as a detachable, positive-locking connection.

[0074] For this purpose, the two coupling parts 221 / 222 can be designed so that they interlock positively (see, for example, Fig. 5), whereby, for example, the first coupling part 221 can be connected to the catch section 210 and the second coupling part 222 to the remaining catch element 200.

[0075] In particular, the first coupling part 221 can have at least a first positive-locking contact with the second coupling part 222 in the longitudinal direction of the guide section 230 of the catching element 200 and at least a second positive-locking contact transverse to the longitudinal direction of the guide section 230 of the catching element 200, wherein the guide section 230 can extend from the catching section 210 in the direction of the grip section 300 (see Fig. 1a).

[0076] The at least one locking element 225 can be passed through the at least two coupling parts 221 / 222, thereby securing the positive locking connection of the two coupling parts 221 / 222. Furthermore, when the at least one locking element 225 is pulled out of at least the first coupling part 221, the positive locking connection of the at least two coupling parts 21 / 222 can be unlocked or released.

[0077] Furthermore, it can be advantageous that the recess 223 (cylindrical recess 223) extends only partially through the first coupling part 221 in the longitudinal direction of the coupling section 220 and, in particular, has a spatial limitation in the area of ​​the protruding section 231 (231a / 231b) in the longitudinal direction of the coupling section 220, since this prevents the locking element 225 inserted into the recess 223 from coming into contact with the potentially rotating protruding section 218 of the catch section 210. This advantageously ensures that the rotational movement of the catch section 210 relative to the guide section 230 or the remaining catch element 200 (after the catch section 210 has been pushed out of the sleeve section 100; see Fig. 3) can proceed unhindered.

[0078] Fig. 3 shows an exemplary representation of the trapping element 200 with trapping section 210, wherein the trapping section 210 is now pushed out of the shell section 100.

[0079] As briefly mentioned earlier, the capture section 210 is rotatably mounted relative to the guide element 230 and the remaining capture element 200, so that the capture section 210 can perform at least a partial rotation after being pushed out of the sheath section 100. This rotation can be assisted, for example, by the force of gravity acting on the capture section 210 and / or caused by contact of the extended capture section 210 with the surrounding tissue, such as the tissue of a patient's bladder.

[0080] Since, as already described, the remaining locking element 200 (including coupling section 220 and guide section 230) is rotatable or rotatable (rotational movement R) about the longitudinal axis (here shown by way of example as longitudinal axis L) of the shell section 100, in particular about the longitudinal axis of the shell section 100 in the area of ​​the opening 110 of the shell section 100, the locking section 210, which is angled to the remaining locking element 200 by the rotational movement, can rotate at a certain angle β to the longitudinal axis L of the shell section 100 about the longitudinal axis L of the shell section 100 (in particular the longitudinal axis of the shell section 100 in the area of ​​the opening 110) and, by the rotation R, generate / perform a cone-shaped movement, for example.

[0081] This significantly facilitates the entanglement of the capture section 210 with stent retrieval threads, for example with stent retrieval threads of a ureteral stent, for the purpose of removing the stent / ureteral stent from the patient.

[0082] The angle of the locking section 210 to the longitudinal axis L of the shell section 100 (especially in the area of ​​the opening 110) can, for example, assume an angle β of >0 to >90°, for example 10°, 25°, 45°, 70°, and all angles β in between. Fig. 4 shows an exemplary representation of the coupling section 220 of the locking element 200 with the wire-shaped element 225 as a locking element 225 for securing the connection of the at least two coupling parts 221 / 222 to each other.

[0083] As already mentioned, the locking element 225 can be designed as a wire-shaped element 225 which, when passed through the at least two coupling parts 221 / 222 of the coupling section 220, blocks / prevents the positive locking connection of the two coupling parts 221 / 222 from being released.

[0084] In particular, it can be advantageous for the user that the coupling section 200 can be actuated from the handle section 300, so that the catch section 210 is decoupled from the remaining catch element 200 when actuated by releasing the positive locking connection of the two coupling parts 221 / 222.

[0085] For this purpose, the handle section 300 can advantageously have the handle element 301, wherein the coupling section 220 can be actuated from the handle section 300 by pulling the wire-shaped element 225 / locking part 225 by means of the handle element 301 of the handle section 300 in such a way that the catch section 210 is decoupled from the remaining catch element 200 when the handle element 301 is actuated by releasing the positive locking connection of the two coupling parts 221 / 222.

[0086] By actuating the handle element 301, the locking element 225 / wire-shaped elements 225 are pulled out of the recess 223 (for example, cylindrical recess 223), at least to the point where the locking element 225 is no longer received by the section of the recess 223 of the first coupling part 221. This allows the first coupling part 221 to disengage from the positive-locking connection with the second coupling part 222 and thus decouple the catch section 210 from the remaining catch element 200.

[0087] Fig. 5 shows two exemplary representations of the coupling section 220, wherein the first exemplary representation a) shows the joining of the at least two coupling parts 221 / 222 and the second exemplary representation b) shows the passage of the wire-shaped element 225 / locking part 225 through the second coupling part 222.

[0088] To better understand the exemplary structure of the coupling section 220, it is shown in more detail how the two coupling parts 221 / 222 are inserted into each other (Figure a)), before the locking element 225 / wire-shaped element 225 is inserted into the recess 223 or received by the recess 223 (here without visibility of the first coupling part 221; Figure b)) and thereby the positive locking connection of the two coupling parts 221 / 222 and thus the coupling section 220 is secured.

[0089] Now, via the secure positive-locking connection of the two coupling parts 221 / 222, both translational movements and rotational movements (see Fig. 3) of the catching element 200 or of the handle section 300 connected to the catching element 200 can be safely transmitted to the catching section 210 (and also to the guide section 230).

[0090] This allows, for example, the securing threads of a stent / ureteral stent to be securely captured and entangled with the capture section 210, so that the exemplary device 1000 together with the connected stent / ureteral stent can be pulled out of the patient's body.

[0091] And if unexpected complications arise during the withdrawal of the stent / ureteral stent (for example, the stent / ureteral stent becoming stuck in the patient), the coupling or coupling section 220 can be unlocked by pulling the locking element 225 out of the two coupling parts 221 / 222 (or at least out of the first coupling part 221), thereby releasing the positive locking connection of the two coupling parts 221 / 222. This is essentially the reverse sequence of creating and securing the positive locking connection of the two coupling parts 221 / 222 (first unlocking (illustration b)) and then releasing the positive locking connection (illustration a)) according to Fig. 5).

[0092] Fig. 6 shows two exemplary representations of the trapping section 210, wherein the first exemplary representation a) shows the blank 210a for formation into the trapping section 210 and the second exemplary representation b) shows the trapping section 210 formed by rotating the blank 210a about its longitudinal axis.

[0093] The raw part 210a, already equipped with catch projections 211a / 211b (which may, for example, be formed in a series of catch projections 211a and 211b), can first be manufactured, for example, using injection molding technology (see, for example, Figure a)). Here, the catch projections 211a / 211b may already be formed in pairs, with the pairs of catch projections 211a / 211b being offset along the longitudinal direction of the catch projection retaining section 212. The raw part 210a can then be rotated about its longitudinal axis, resulting in an angular offset between catch projections 211a and 211b along the catch projection retaining section 212 (see, for example, Figure b)). The angle a (or rotation angle a) between the individual locking projections 211a orCatching projections 211b or pairs of catching projections 211a / 211b, which may, for example, have a range of 30° - 65°, in particular preferably a range of 50° - 55° (see description above), have the same orientation from pair to pair, so that the catching projections 211a / 211b can be arranged in a double spiral shape on the catching projection retaining section 212.

[0094] For twisting the blank 210a about its longitudinal axis or about the longitudinal axis of the catch projection retaining section 212, it can be advantageous to reheat the blank 210a and then twist it, since the heating makes the plastic material plastically deformable and the catch section 210 thus produced essentially retains its twist when cooled. Alternatively, the twisting can also be carried out immediately after injection molding the blank 210a, since the blank 210a may still have a temperature suitable for plastic deformation at this point.

[0095] It should be noted at this point that the step of twisting the raw part 210a to form the catch section 210 is not absolutely necessary and instead the raw part 210a could also be used directly as catch section 210.

[0096] Furthermore, the fully formed catch section 210 can be produced by methods other than injection molding followed by twisting, as shown and described in Figures a) and b) of Fig. 6. For example, the catch section 210 can be manufactured using an additive manufacturing process such as 3D printing. This also allows for the creation of other variants of the catch section 210 that differ from the example shown, for example, different / more complex catch projections 211a / 211b.

[0097] Furthermore, the capture section 210 can also be designed in a brush-like form, so that it can be brought into engagement with the stent, for example a ureteral stent, in particular with the stent's capture threads, in which case a twisting of the raw part 210a to form the capture section 210 can also be omitted.

[0098] Fig. 7 shows an exemplary detailed view of the trap section 210 in sectional view (section runs transversely to the longitudinal direction of the trap projection retaining section 212) with an exemplary angle a or rotation angle a between the individual pairs of trap projections 211a / 211b.

[0099] As already described, the angle α or the angle of rotation α between adjacent pairs of catch projections 211a / 211b along the catch projection retaining section 212 can be in a range of 30° - 65°, particularly preferably in a range of 50° - 55°, wherein, in particular, the same angle α can be formed between each adjacent pair of catch projections 211a / 211b. It should be noted here that, in addition to the values ​​of the angle α mentioned here, other values ​​can also be provided, for example 15°, 20°, 25°, 35°, 40°, 45°, 60°, 70°, 75°, and all intermediate and above / below values ​​of the angle α.

[0100] Furthermore, the trap section 210 can be designed, for example, such that between individual pairs of trap projections 211a / 211b both the value of the angle a / rotation angle a and the orientation of the angle a / rotation angle a are different.

[0101] For example, the angle a from a first pair of trapping protrusions 211a / 211b to a second pair of trapping protrusions 211a / 211b adjacent to the first pair may be, for example, 55°, while from the second pair of trapping protrusions 211a / 211b to a third pair of trapping protrusions 211a / 211b adjacent to the second pair, the angle a may be, for example, only 40°.

[0102] Furthermore, the orientation of the angle a from a first pair of catch projections 211a / 211b to a second pair of catch projections 211a / 211b adjacent to the first pair, along the catch projection retaining section 212 from the preceding section 218, can be different (for example, a positive / clockwise orientation of the angle a) than the orientation of the angle a from the second pair of catch projections 211a / 211b to a third pair of catch projections 211a / 211b adjacent to the second pair (for example, a negative / counterclockwise orientation of the angle a).

[0103] Furthermore, a combination of different values ​​of the angle a and its orientation can also be used for the respective capture section 210.

[0104] 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.

[0105] Reference symbol list

[0106] 100 mantle section

[0107] 110 Opening of the mantle section

[0108] 200 catching element

[0109] 210 Catch section

[0110] 210a Raw part for training to the trap section

[0111] 211 Catching lead

[0112] 211a Catching lead

[0113] 211b Catching lead

[0114] 212 Catching platform holding section

[0115] 218 preceding section (of the trapping section)

[0116] 218a preceding subsection (of the preceding section of the trapping section) 218b preceding subsection (of the preceding section of the trapping section) 220 coupling section

[0117] 221 first clutch part

[0118] 222 second clutch part

[0119] 223 Recess of the coupling section

[0120] 225 Fuse part / wire-shaped element

[0121] 230 Guide section

[0122] 231 preceding section (of the leadership section)

[0123] 231a preceding subsection (of the preceding section of the guide section) 231b preceding subsection (of the preceding section of the guide section) 235 pin-shaped element 300 handle section

[0124] 301 Handle element

[0125] 1000 Device for stent extraction

[0126] L Longitudinal axis of the shell section

[0127] R Rotation / Rotational movement of the trapping element

[0128] a Angle / Angle of rotation between catch projections / pairs of catch projections

[0129] β Angle of folding down the catch section relative to the longitudinal axis of the

[0130] mantle section

Claims

Patent claims 1. Device for extracting a stent, in particular a ureteral stent, comprising: - a sheath section that is tubular in shape and connected at its first end to a handle section and has an opening at its second end opposite the handle section; and - a capture element which is movable at least translationally in the longitudinal direction of the mantle section and has a capture section at its end facing the opening of the mantle section which is designed to engage with the stent; wherein the trapping section is designed in such a way that, after the trapping section is pushed out of the sheath section, the trapping section can be folded down relative to the rest of the trapping element.

2. Device according to claim 1, wherein the catching element has a guide section that extends from the catching section towards the handle section, and the catching section is rotatably mounted relative to the guide section for folding down.

3. Device according to claim 2, wherein The catch section and the guide section for forming the rotatable bearing each have a projecting section, wherein the projecting section of the catch section, which projects in the direction of the guide section, and the projecting section of the guide section, which projects in the direction of the catch section, are connected to each other by a pin-shaped element.

4. Device according to claim 3, wherein the preceding section of the guide section is formed by two preceding subsections and the preceding section of the catch section is provided between the two preceding subsections of the guide section, wherein the two preceding subsections of the guide section and the preceding section of the catch section are connected to each other by the pin-shaped element.

5. Device according to claim 3, wherein the foreground section of the trap section is formed by two foreground subsections and the foreground section of the guide section is provided between the two foreground subsections of the trap section, wherein the two foreground subsections of the trap section and the foreground section of the guide section are connected to each other by the pin-shaped element.

6. Device according to one of claims 3 to 5, wherein the protruding section of the catch section and / or the protruding section of the guide section are / are rotatable relative to the pin-shaped element.

7. Device according to one of the preceding claims, wherein The trapping element in the mantle section is also rotatably movable.

8. Device according to one of the preceding claims, wherein The capture section has an elongated capture projection retaining section with a longitudinal direction which, in the unfolded state of the capture section, is parallel to the longitudinal direction of the mantle section, wherein at least one capture projection is formed on the capture projection retaining section radial to the longitudinal direction of the capture projection retaining section, which is designed to engage with the stent, in particular with capture threads of the stent.

9. Device according to claim 8, wherein which at least one catching projection is hook-shaped, in particular C-hook-shaped, wherein the opening of the hook shape is oriented towards the guide section.

10. Device according to claim 8 or 9, wherein the trapping section has a large number of trapping projections, preferably eight to ten trapping projections, particularly preferably twelve to fourteen trapping projections.

11. Device according to claim 10, wherein The multitude of catch projections are formed in pairs on the catch projection retaining section, wherein two catch projections forming a pair are diametrically opposed to each other and offset in the longitudinal direction of the catch projection retaining section.

12. Device according to claim 10 or 11, wherein The multitude of catch projections, viewed in the longitudinal direction of the catch projection holding section, exhibit an angle between them.

13. Device according to claims 11 and 12, wherein a pair of trapping projections to their respective adjacent pair of trapping projections have an angle in the range of 30° - 65°, particularly preferably 50° - 55°, wherein in particular the same angle is formed between each pair of trapping projections.

14. Device according to claim 13, wherein the pairs of catch projections are arranged offset along the longitudinal direction of the catch projection holding section.

15. Device according to claim 14, wherein The angle between the individual pairs of catch projections has the same orientation from pair to pair, so that the catch projections are arranged in a double spiral shape on the catch projection holding section.

16. Device according to any one of claims 1 to 7, wherein The capture section is designed in a brush-like shape so that it can be brought into engagement with the stent, in particular with the stent's capture threads.

17. Device according to one of the preceding claims, wherein the catching element further comprises a coupling section which is designed to decouple the catching section from the rest of the catching element.

18. Device according to claim 17, wherein The coupling section is designed as a detachable, positive-locking connection.

19. Device according to claim 18, wherein the coupling section has at least two coupling parts that interlock positively, wherein a first coupling part is connected to the catching section and a second coupling part is connected to the remaining catching element, and The coupling section further comprises at least one locking element which is designed to be passed through the at least two coupling parts and thereby secure the positive locking connection and, when the locking element is pulled out of at least the first coupling part, to unlock the positive locking connection of the at least two coupling parts.

20. Device according to claim 19, wherein the first coupling part with the second coupling part has at least a first positive-locking contact in the longitudinal direction of a guide section of the catching element and at least a second positive-locking contact transverse to the longitudinal direction of the guide section of the catching element, wherein the guide section extends from the catching section in the direction of the handle section.

21. Device according to claim 19 or 20, wherein The locking element is designed as a wire-like element which, when passed through the at least two coupling parts, blocks the loosening of the positive locking connection.

22. Device according to one of claims 17 to 21, wherein The coupling section can be operated from the handle section.

23. Device according to claim 22 with claim 21, wherein The coupling section can be actuated from the handle section by pulling the wire-like element using a handle element of the handle section in such a way that the catch section is decoupled from the rest of the catch element when actuated.

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