Ureteral stent retracting device

Abstract

The ureteral stent tube retracting device comprises a hollow outer tube and an inner tube, one end of the outer tube is provided with a first opening allowing a ureteral stent tube to be inserted, the other end of the outer tube is provided with a second opening, and the inner tube can extend into the outer tube from the second opening and is used for pushing the ureteral stent tube inserted into the first opening out of the first opening. The outer tube is inserted into the urethra, the ureteral stent tube is inserted into the first opening, and the outer tube can push the ureteral stent tube. And when the outer tube is continuously inserted into the urethra, the ureteral stent tube is pushed back into the bladder by the outer tube through the urethra. And the outer tube can ensure that the ureteral stent tube can be smoothly retracted into the bladder. Meanwhile, the inner tube is inserted into the outer tube from the second opening, the ureter support tube is pushed out of the first opening, and the outer tube and the inner tube can be pulled out together. The ureter stent tube and the outer tube can be easily separated through the inner tube, and the situation that the ureter stent tube is displaced due to unsuccessful retraction and unsuccessful separation is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and in particular to a ureteral stent retraction device. Background Art

[0002] Ureteral stents, also known as double-J tubes or pigtail catheters, are primarily used for ureteropelvic junction obstruction, stone surgery, and post-renal transplant recovery. A ureteral stent consists of two coiled ends connected by a catheter. One end is placed in the renal pelvis, and the other in the bladder. Urine can be drained through the wall or lumen of the catheter attached to the renal pelvis into the bladder.

[0003] The bladder end of the ureteral stent is prone to dislodging from the urethral opening. Once dislodged, the ureteral stent is prone to displacement. If not reinserted in time, the drainage and support functions may fail. In the prior art, because there is no reinsertion device specifically for reinserting ureteral stents, medical staff often use a ureteral catheter to deliver the ureteral stent into the bladder to maintain its support and drainage functions. However, both the existing ureteral catheter and the ureteral stent are located in the narrow bladder, and medical staff cannot enter the bladder to separate the ureteral catheter and the ureteral stent. The ureteral catheter and the ureteral stent are difficult to separate, and the reinsertion is unsuccessful. In addition, if the ureteral catheter is pulled out directly, it will cause the ureteral stent to shift again, leading to serious complications such as urine extravasation. Utility Model Content

[0004] The embodiments of the present application provide a ureteral stent retraction device to at least partially improve the above-mentioned technical problems.

[0005] The present invention provides a ureteral stent retraction device, comprising:

[0006] a hollow outer tube, wherein one end of the outer tube has a first opening for inserting a ureteral stent and the other end has a second opening; and

[0007] The inner tube can extend into the outer tube from the second opening and is used to push the ureteral stent inserted into the first opening out of the first opening.

[0008] In one embodiment, the outer diameter of the inner tube is smaller than or equal to the diameter of the first opening.

[0009] In one embodiment, a first positioning hole penetrating the outer tube wall is provided in the tube wall, and the first positioning hole is spaced apart from the first opening.

[0010] In one embodiment, the distance between the first positioning hole and the first opening is 3 cm-5 cm.

[0011] In one embodiment, the inner tube is a hollow structure, and a second positioning hole that cooperates with the first positioning hole is opened on the tube wall of the inner tube. When the inner tube is inserted into the outer tube from the second opening and the second positioning hole corresponds to the first positioning hole, the end face of the inner tube is flush with the first opening or extends out of the first opening.

[0012] In one embodiment, one end of the inner tube adjacent to the second positioning hole is closed.

[0013] In one embodiment, an end of the outer tube adjacent to the first opening is configured in a tapered shape.

[0014] In one embodiment, the outer tube is a silicone tube, and / or the inner tube is a plastic tube.

[0015] In one embodiment, marking scales are provided on the tube wall of the outer tube and / or the inner tube.

[0016] In one embodiment, the diameter of the first opening is 1 mm-2.7 mm.

[0017] The ureteral stent retraction device provided in an embodiment of the present application has a first opening and a second opening at each end of the outer tube. When the ureteral stent is dislocated into the urethra, the outer tube is inserted into the urethra, and the ureteral stent is inserted into the first opening, and the outer tube can push the ureteral stent. As the outer tube continues to be inserted into the urethra, the ureteral stent is pushed back into the bladder by the outer tube through the urethra. The outer tube can ensure that the ureteral stent can be smoothly retracted into the bladder, maintaining the support and drainage functions of the ureteral stent. At the same time, the inner tube is inserted into the outer tube from the second opening, and the ureteral stent is pushed out of the first opening, and the outer tube can be pulled out together with the inner tube. The inner tube can easily separate the ureteral stent from the outer tube, avoiding situations such as unsuccessful retraction and unsuccessful separation of the inner and outer tubes, which leads to displacement of the ureteral stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic structural diagram of a ureteral stent tube proposed in an embodiment of the present application;

[0020] Figure 2 This is a schematic structural diagram of a ureteral stent retraction device proposed in an embodiment of the present application.

[0021] Figure numerals: ureteral stent 100, ureteral stent retraction device 200, outer tube 210, channel 211, first opening 212, second opening 213, first positioning hole 214, first mark 215, inner tube 220, second positioning hole 221, second mark 222, renal pelvis 31, bladder 32, ureter 33, urethra 34. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0023] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," and "fixed" should be interpreted broadly. For example, these terms may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; internal communication between two components; surface contact only; or surface contact through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0024] In addition, the terms "first", "second", etc. are only used to distinguish descriptions and should not be understood as specific or special structures. The descriptions of the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this application and the features of the different embodiments or examples, unless they are contradictory.

[0025] See also Figure 1The ureteral stent 100 is also called a double J tube or a pigtail catheter, etc. It is mainly used for ureteropelvic junction obstruction, stone surgery, and postoperative recovery after kidney transplantation. The ureteral stent 100 includes two curled ends and a catheter connecting the two ends, one end of which is placed in the renal pelvis 31 and the other end is placed in the bladder 32. The catheter of the ureteral stent 100 is located in the ureter 33 between the renal pelvis 31 and the bladder 32. Urine can be drained from the renal pelvis 31 along the wall of the catheter or its inner cavity until it reaches the bladder. Among them, the outer diameter of the ureteral stent 100 is 1mm-2.7mm, such as 1mm, 1.3mm, 2mm, 2.7mm, etc. This embodiment does not limit the size of the ureteral stent 100, which can be selected and designed according to the patient's specific condition and body tissue structure to obtain better treatment effects.

[0026] The bladder end of the ureteral stent 100 is easy to dislodge from the urethral opening, and the ureteral stent 100 that has dislodged is easy to shift. If it is not retracted in time, it is easy to cause the drainage and support functions to fail. In the prior art, because there is no retraction device specifically used for retracting the ureteral stent 100, medical staff often use a ureteral stent to deliver the ureteral stent 100 into the bladder 32 to maintain its support and drainage functions. Specifically, it inserts the ureteral stent 100 into the side hole of the ureter (not shown in the figure), and then returns the two to the urethra 34 together. Then, the impact force of the water flow is used to impact the ureteral stent 100 in the ureter, forcing the ureter and the ureteral stent 100 to separate, thereby completing the retraction of the ureteral stent 100. However, during the reinsertion process, at least a portion of the ureteral stent 100 lies around the ureter, dramatically increasing the maximum diameter of the combined structure. This makes reinsertion into the urethra 34 inconvenient, and even renders the combined structure incapable of entry into the narrow urethra 34. The resistance experienced by the ureteral stent 100 and the ureteral catheter in the urethra 34 also increases, making reinsertion more difficult. Furthermore, during the reinsertion process, this resistance is directed in the opposite direction of the ureteral movement. This increased resistance forces the ureteral stent 100 to gradually enter the ureter, indirectly increasing the difficulty of subsequent separation of the ureteral stent 100 from the ureter.

[0027] In the prior art, urinary catheter reinsertion and separation are difficult to implement and difficult to perform. In addition, both the ureter and the ureteral stent 100 are located in the narrow bladder 32, and medical personnel cannot directly enter the bladder 32 to separate the ureter and the ureteral stent 100. In addition, urine and other substances in the bladder 32 will adhere to the space between the ureter and the ureteral stent 100. The tension generated by the urine provides a certain resistance, making separation of the two more difficult. The ureter and the ureteral stent 100 are difficult to separate, and reinsertion is unsuccessful. If the ureter is pulled out directly, it will cause the ureteral stent 100 to shift again, leading to serious complications such as urine extravasation.

[0028] Example

[0029] This embodiment provides a ureteral stent retraction device 200, please refer to Figure 1 as well as Figure 2 The ureteral stent retraction device 200 may include an outer tube 210 and an inner tube 220. The outer tube 210 may push the ureteral stent 100 back into the bladder 32 through the urethra 34, the bladder neck, etc. The inner tube 220 may be inserted into the outer tube 210 and separate the ureteral stent 100 from the outer tube 210.

[0030] For details, please refer to Figure 2 Outer tube 210 can be a silicone tube. Silicone tubes offer advantages such as flexibility, strong corrosion resistance, good antibacterial properties, and ease of processing and molding. They are also non-irritating to human tissue, non-toxic, and non-allergic, with minimal rejection by the body. This configuration provides outer tube 210 with a certain degree of flexibility. During insertion into the urethra 34, outer tube 210 conforms to the patient's urethra 34 without puncturing or abrading it, thereby improving the safety of outer tube 210.

[0031] In addition, in other cases, the outer tube 210 can also be configured as a latex tube, a silicone rubber tube, a polyurethane tube, etc. to adapt to the specific conditions of different patients, etc.

[0032] In one embodiment, the outer diameter of the outer tube 210 is smaller than or slightly smaller than the diameter of the narrow portion of the urethra 34. For example, the outer diameter of the outer tube 210 may be 3 mm to 5 mm, such as 3 mm, 4 mm, or 5 mm. The outer diameter is sufficiently small to allow the outer tube 210 to be smoothly inserted into the urethra 34. The outer diameter of the outer tube 210 needs to be selected and designed based on the patient's physical condition. For example, if the patient is a child, the outer tube 210 should be smaller in size, which will not be further described here.

[0033] In this embodiment, the cross-sectional shape of the outer tube 210 can be a hollow circular structure, an elliptical structure, a polygonal structure, etc. The specific shape of the outer tube 210 is not limited in this embodiment and is selected and designed according to the patient's condition, implementation requirements, etc.

[0034] See also Figure 1 and Figure 2The outer tube 210 is configured to be hollow, that is, a channel 211 can be provided inside the outer tube 210. One end of the outer tube 210 has a first opening 212, and the other end has a second opening 213. The first opening 212 allows the ureteral stent 100 to be inserted. When the ureteral stent 100 is retracted into the urethra 34, at least a portion of the ureteral stent 100 is located inside the outer tube 210, rather than on the circumference of the outer tube 210. The maximum outer diameter of the retraction device 200 is the outer diameter of the outer tube 210, and the outer diameter of the outer tube 210 is smaller than the diameter of the narrow part of the urethra 34. It does not increase the resistance encountered by the ureteral stent 100 in the urethra 34. Compared with the existing technology, the implementation difficulty is reduced, it is easy to use, and it is more reliable.

[0035] The first opening 212 and the second opening 213 can both communicate with the channel 211, so that the first opening 212 and the second opening 213 are interconnected. Furthermore, the sizes of the first opening 212 and the second opening 213 can be configured to be the same or different. Furthermore, the shapes of the first opening 212 and the second opening 213 can be configured to be circular, elliptical, polygonal, or other irregular shapes, etc., depending on the specific implementation scenario and the shape of the ureteral stent 100, and are not limited in this embodiment.

[0036] In one embodiment, the end of the outer tube 210 adjacent to the first opening 212 is configured to be tapered. The purpose of configuring this end to be tapered is to disperse cell tissue, including the urethral wall, urine, etc., to facilitate insertion of the outer tube 210 into the urethra 34. Furthermore, the first opening 212 can be located at the tip of the tapered end. This configuration eliminates a sharp point structure and improves the safety of the outer tube 210. In other embodiments, the end of the outer tube 210 adjacent to the first opening 212 can also be configured to be truncated cone-shaped or spherical, etc., which not only facilitates insertion of the outer tube 210 into the urethra 34, but also avoids damage to the patient's urethral wall by not having a sharp point structure.

[0037] In other embodiments, the end of the outer tube 210 adjacent to the first opening 212 may also be configured as other irregular shapes or planes, etc., which needs to be selected based on the patient's condition, implementation requirements, etc., and this embodiment does not limit this.

[0038] In one embodiment, the caliber of the first opening 212 can be greater than or equal to the outer diameter of the ureteral stent 100. This configuration allows the ureteral stent 100 to be smoothly inserted into the first opening 212, avoiding the situation where the ureteral stent 100 cannot be inserted and affects the retraction effect. Exemplarily, the caliber of the first opening 212 can be 1mm-2.7mm, specifically 1mm, 1.3mm, 2mm, 2.7mm, etc., that is, the caliber of the first opening 212 can be configured to be the same as the outer diameter of the ureteral stent 100. The setting that the caliber of the first opening 212 is the same as the outer diameter of the ureteral stent 100 can promote close contact between the two, avoid the ureteral stent 100 from being separated from the outer tube 210 during the retraction process, and ensure the retraction effect of the ureteral stent 100.

[0039] Because the outer tube 210 is inserted into the urethra 34, it is difficult for medical staff to directly observe the position of the outer tube 210, and thus it is difficult to determine whether the ureteral stent 100 is in place. To solve the problem of determining the position of the ureteral stent 100, please continue to refer to Figure 2 In this embodiment, a first positioning hole 214 is provided on the wall of the outer tube 210, which penetrates the wall. The first positioning hole 214 is connected to the channel 211 of the outer tube 210. As the outer tube 210 is continuously inserted into the urethra 34, the outer tube 210 drives the ureteral stent 100 inserted into the first opening 212 into the bladder 32, that is, the ureteral stent 100 is smoothly retracted into the bladder 32. At the same time, the first positioning hole 214 is connected to the bladder 32, and the urine in the bladder 32 will enter the channel 211 through the first positioning hole 214 and flow out from the second opening 213. When the medical staff observes a large amount of urine flowing out of the second opening 213, it indicates that both the end of the outer tube 210 and the ureteral stent 100 have moved into the bladder 32, and the subsequent operation of separating the ureteral stent 100 and the outer tube 210 can be performed. This configuration can simply determine the position of the outer tube 210 and the ureteral stent tube 100 and prompt medical staff to perform subsequent operations. It is simple, reliable, and easy to use.

[0040] The first positioning hole 214 is spaced apart from the first opening 212. Specifically, the first opening 212 can be provided at the end of the outer tube 210, and the first positioning hole 214 can be provided at the wall of the outer tube 210. The first opening 212 and the first positioning hole 214 are spaced apart. This spacing between the first opening 212 and the first positioning hole 214 ensures that, just as the first positioning hole 214 is connected to the bladder 32, the first opening 212 has already been driven to a position sufficiently far away from the urethra 34. At this point, the ureteral stent 100 can be separated from the outer tube 210 using the inner tube 220 without causing the ureteral stent 100 to detach from the urethra 34 again, thereby effectively ensuring the retraction effect of the ureteral stent retraction device 200.

[0041] Furthermore, the distance between the first positioning hole 214 and the first opening 212 (eg Figure 2 The first positioning hole 214 and the first opening 212 are preferably spaced apart from each other (as shown in d1 in the figure) to be 3cm-5cm. The spacing between the first positioning hole 214 and the first opening 212 should not be too large or too small. If the spacing between the first positioning hole 214 and the first opening 212 is too large, when the first positioning hole 214 is connected to the bladder 32, the outer tube 210 that is too long is inserted into the bladder 32, which can easily cause damage to the bladder 32. If the spacing between the first positioning hole 214 and the first opening 212 is too small, the outer tube 210 and the ureteral stent 100 are not in place, the first positioning hole 214 is connected to the bladder 32, and the ureteral stent 100 is easily detached from the urethra 34 again, resulting in unsuccessful retraction. The first positioning hole 214 and the first opening 212 with appropriate spacing can ensure that the outer tube 210 and the ureteral stent 100 are driven to the designated position in the bladder 32, ensuring the retraction effect of the ureteral stent 100. It also avoids excessive insertion of the outer tube 210, thereby improving the safety of the ureteral stent retraction device 200.

[0042] It is understood that the spacing needs to be specifically designed and selected based on the patient's developmental level, the specific condition of the affected area, and other factors, and this embodiment is not limiting. For example, if the ureteral stent retraction device 200 is used in children, whose urinary system organs such as the bladder 32 are not yet fully developed, the spacing can be configured to be smaller to avoid damage to the bladder 32 caused by the insertion of an excessively long outer tube 210.

[0043] In addition, the number of the first positioning holes 214 can be configured to be multiple, such as 2, 3, 4, etc. When the urine has a sufficiently large flow rate, the aperture of each first positioning hole 214 can be configured to be smaller, effectively preventing the patient's urethral tissue from entering the first positioning hole 214 and causing wear, scratches, etc.

[0044] Furthermore, multiple first positioning holes 214 can be distributed around the axis of the outer tube 210. Smaller diameters of the first positioning holes 214 and more dispersed arrangement of the multiple first positioning holes 214 can improve the flow effect of the urethra 34, thereby enhancing the prompt effect of the outer tube 210 being inserted in place, while also ensuring the structural strength of the outer tube 210 itself.

[0045] It is understandable that when there are multiple first positioning holes 214 , the distance between the first positioning holes 214 and the first opening 212 can be understood as the average distance between the multiple first positioning holes 214 and the first opening 212 , that is, the average distance can be 3 cm-5 cm.

[0046] In this example, please continue to refer to Figure 2 , it is convenient to observe the specific structure and marking of the outer tube 220 and the inner tube 210, Figure 2 The inner tube 210 is shown as not being inserted into the outer tube 210. The outer diameter of the inner tube 220 is less than or equal to the diameter of the second opening 213. This configuration enables the inner tube 220 to extend into the outer tube 210 from the second opening 213 and be used to push at least a portion of the ureteral stent 100 inserted into the first opening 212 out of the first opening 212. This allows the inner tube 220 to successfully push the ureteral stent 100 out of the outer tube 210. Furthermore, the inner tube 220 can be a plastic tube, which has advantages such as strength, load capacity, and corrosion resistance. Plastic tubes can withstand forces within a certain range, allowing the force applied by medical personnel to insert the inner tube 220 into the outer tube 210 to be smoothly transmitted to the ureteral stent 100, thereby ensuring that the inner tube 220 can successfully push the ureteral stent 100 out of the outer tube 210.

[0047] It is understandable that the inner tube 220 can also be configured as a polyvinyl chloride tube, a polyurethane tube, etc., to adapt to different application environments and the outer tube 210, etc.

[0048] In one embodiment, while the outer diameter of the inner tube 220 is less than or equal to the caliber of the second opening 213, the outer diameter of the inner tube 220 of this embodiment can also be less than or equal to the caliber of the first opening 212. This configuration can enable the end of the inner tube 220 to be smoothly pushed to the first opening 212, driving the ureteral stent tube 100 to be completely separated from the outer tube 210, thereby improving the separation effect of the ureteral stent tube 100 and the outer tube 210.

[0049] When the inner tube 220 is inserted into the outer tube 210, the inner wall of the outer tube 210 contacts the outer wall of the inner tube 220, which generates a certain friction, making it difficult to insert the inner tube 220 into the outer tube 210. In one embodiment, to reduce the difficulty of inserting the inner tube 220 into the outer tube 210, in addition to a circular cross-sectional shape, the cross-sectional shape of the inner tube 220 of this embodiment can also be configured as a rectangle, a triangle, an ellipse, etc. The above cross-sectional shapes reduce the contact area between the inner tube 220 and the inner wall of the outer tube 210, thereby reducing friction, making it easier to insert the inner tube 220 into the outer tube 210.

[0050] In one embodiment, see Figure 2The inner tube 220 can also be a hollow structure. The wall of the inner tube 220 is provided with a second positioning hole 221 that matches the first positioning hole 214. The size, shape, number, etc. of the first positioning hole 214 and the second positioning hole 221 can be set to be the same. For example, the apertures of the first positioning hole 214 and the second positioning hole 221 are both 0.4 mm. When the outer tube 210 is inserted into place, urine will flow into the channel 211 from the first positioning hole 214. The inner tube 220 is inserted into the channel 211 of the outer tube 210 from the second opening 213, and the flow rate of urine in the channel 211 is reduced or almost 0. As the inner tube 220 is continuously inserted, the end face of the inner tube 220 can be flush with the first opening 212 or extend out of the first opening 212, and the inner tube 220 can completely push the ureteral stent 100 out of the first opening 212. At the same time, the second positioning hole 221 corresponds to the first positioning hole 214, and the first positioning hole 214 is connected to the second positioning hole 221, causing urine to flow out of one end of the hollow inner tube 220. This means that when medical personnel observe urine flowing out of the inner tube 220, it indicates that the inner tube 220 has completely pushed the ureteral stent 100 out of the first opening 212, indicating that the separation of the ureteral stent 100 and the outer tube 210 is complete, and the subsequent removal of the outer tube 210 and the inner tube 220 can be carried out. This configuration is simple, reliable, and easy to use.

[0051] In one embodiment, the number of the first positioning holes 214 can be set to multiple, and the number of the second positioning holes 221 can also be set to multiple accordingly, for example, 2, 3, 4, etc., and the multiple second positioning holes 221 are distributed along the axis of the inner tube 220. While ensuring sufficient space for urine flow, the multiple second positioning holes 221 can also be configured to be smaller. Relatively speaking, the smaller and more dispersed second positioning holes 221 can improve the structural strength of the inner tube 220. In addition, the increased number and more dispersed distribution of the first positioning holes 214 and the second positioning holes 221 can increase the probability of communication between the two, avoiding the situation where the first positioning holes 214 and the second positioning holes 221 are always unable to communicate due to misalignment, deformation, etc. of the inner tube 220 and / or the outer tube 210. This setting can ensure the reliability of the use of the first positioning holes 214 and the second positioning holes 221.

[0052] It is understandable that, in the present embodiment, because the inner tube 220 needs to push out the ureteral stent tube 100, one end of the inner tube 220 adjacent to the second positioning hole 221 is closed, and the ureteral stent tube 100 cannot enter the closed end. The closed end is conducive to pushing the ureteral stent tube 100 out of the outer tube 210, thereby preventing the ureteral stent tube 100 from entering the inner tube 220 and causing failure to separate the ureteral stent tube 100 and the outer tube 210.

[0053] In another embodiment, the inner tube 220 can also be configured as a solid structure. The solid structure of the inner tube 220 has the characteristics of high strength and high toughness, which effectively reduces the elastic deformation ability of the inner tube 220 and avoids irreversible deformation of the inner tube 220, making it easier to insert into the outer tube 210.

[0054] In one embodiment, see Figure 2 The second positioning hole 221 is spaced apart from the end of the inner tube 220, and the distance between the second positioning hole 221 and the end (such as Figure 2 d2 in FIG) is greater than or equal to the distance between the first positioning hole 214 and the first opening 212 (as shown in FIG). Figure 2 (as shown by d1 in the figure). For example, the distance d1 between the first positioning hole 214 and the first opening 212 can be 5 mm, and the distance d2 between the second positioning hole 221 and the end can be configured to be 6 mm. This configuration ensures that when the second positioning hole 221 corresponds to the first positioning hole 214, the end surface of the inner tube 220 is flush with or extends beyond the first opening 212, ensuring that the ureteral stent 100 can be fully pushed out of the outer tube 210, ensuring the retraction effect on the ureteral stent 100.

[0055] In another embodiment, the ureteral stent retraction device 200 may further include a guide wire (not shown in the figure), which plays a certain guiding role. The guide wire can be inserted into the inner tube 220. When the inner tube 220 begins to be inserted into the outer tube 210, the guide wire generates a thrust toward the closed end of the inner tube 220, which forces the inner tube 220 to reach the designated position despite the resistance. In the subsequent process of inserting the inner tube, the medical staff simultaneously operates the guide wire and the inner tube 220 to push the ureteral stent 100 out of the outer tube 210. More specifically, the guide wire can be a medical stainless steel guide wire, i.e., 1810 stainless steel, which is more durable and corrosion-resistant than guide wires of other types of materials, thereby preventing urine from corroding the guide wire.

[0056] Because the outer tube 210 is inserted into the urethra 34 and the inner tube 220 is inserted into the outer tube 210, the relative positions of the outer tube 210 and the inner tube 220 in the urethra 34 are difficult to determine. Figure 1 as well as Figure 2The outer tube 210 and / or the inner tube 220 are provided with markings on their walls. For easy identification, the outer tube 210's marking is designated as a first marking 215, while the inner tube 220's marking is designated as a second marking 222. The markings serve as length markers. The first marking 215 and / or the second marking 222 are used to observe the length of the inserted portion of the outer tube 210 and / or the inner tube 220. This serves to determine whether the outer tube 210 and / or the inner tube 220 are properly inserted and to prevent damage to the patient's bladder 32 or urethra 34 caused by over-insertion. Furthermore, the markings can be assigned corresponding numerical values ​​to facilitate observation and recording by medical personnel.

[0057] Urine in the urethra 34 will enter the inner tube 220 and / or the outer tube 210, and the urine is mostly light yellow, and some patients have excessively dark yellow. Figure 2 The first mark 215 and / or the second mark 222 should preferably not be yellow. For example, the first mark 215 and / or the second mark 222 may be black, blue, red, etc. Black marking scales are easier to distinguish and more convenient for medical staff to observe, avoiding the situation where the marking line 115 may be unclear due to the influence of urine.

[0058] In some other cases, the walls of the outer tube 210 and the inner tube 220 may also be provided with a developer, and medical staff may monitor through ultrasonic imaging to determine the relative positions of the outer tube 210 and the inner tube 220 in the urethra 34, further avoiding problems such as poor retraction effect or low safety of the ureteral stent tube retraction device 200.

[0059] To facilitate understanding or use of the ureteral stent retraction device 200, this embodiment introduces the working principle of the ureteral stent retraction device 200 through the following content:

[0060] The outer tube 210 is inserted into the urethra 34. Once the end of the ureteral stent 100 located within the bladder 32 protrudes into the urethra 34, the medical professional can insert the outer tube 210 into the urethra 34. As the outer tube 210 is continuously inserted, the end of the ureteral stent 100 located within the urethra 34 is forced into the first opening 212 of the outer tube 210 and is pushed away from the urethra 34 by the outer tube 210 until it reaches a certain position within the bladder 32. In other cases, the curled end of the ureteral stent 100 may be long enough to protrude beyond the urethra 34, potentially causing the end to completely protrude. In other words, one end of the ureteral stent 100 can pass through the urethra 34 and protrude beyond the external urethral opening, allowing the medical professional to observe the end of the ureteral stent 100 from outside the patient's body. In such cases, medical personnel can first insert the end of the ureteral stent tube 100 extending from the external urethral opening directly into the first opening 212 , and then insert the ureteral stent tube 100 and the outer tube 210 into the urethra 34 together, and push them back into the bladder 32 through the urethra 34 .

[0061] Insert the inner tube 220 into the outer tube 210. As the outer tube 210 and ureteral stent 100 are pushed into the bladder 32, the medical staff can observe urine flowing out of the second opening 213. As the inner tube 220 is inserted into the outer tube 210, the flow rate of urine flowing out of the second opening 213 decreases or becomes almost zero. As the inner tube 220 is continuously inserted, it abuts the ureteral stent 100 and pushes it out of the outer tube 210.

[0062] Remove the inner tube 220 and outer tube 210. When the ureteral stent 100 is completely pushed out of the outer tube 210, the medical staff can observe urine flowing out of the inner tube 220 and remove the inner tube 220 and outer tube 210 from the patient's body. The medical staff can remove the inner tube 220 and outer tube 210 simultaneously, or they can remove the inner tube 220 first. The hollow outer tube 210 has greater deformability, making it easier to remove from the urethra 34.

[0063] The ureteral stent retraction device 200 provided in this embodiment has an outer tube 210 with a first opening 212 and a second opening 213 at each end. When the ureteral stent 100 is dislodged into the urethra 34, the outer tube 210 is inserted into the urethra 34. The ureteral stent 100 is inserted into the first opening 212, and the outer tube 210 can push the ureteral stent 100. As the outer tube 210 continues to be inserted into the urethra 34, the ureteral stent 100 is pushed back into the bladder 32 by the outer tube 210 through the urethra 34. The outer tube 210 ensures that the ureteral stent 100 can be smoothly retracted into the bladder 32, maintaining the support and drainage functions of the ureteral stent 100. Simultaneously, the inner tube 220 is inserted into the outer tube 210 through the second opening 213 and pushed out of the first opening 212. The outer tube 210 and the inner tube 220 can then be removed together. The inner tube 220 can easily separate the ureteral stent 100 from the outer tube 210, thereby avoiding situations such as unsuccessful reinsertion or unsuccessful separation of the inner tube 220 and the outer tube 210, which may lead to displacement of the ureteral stent 100.

[0064] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A ureteral stent retraction device, characterized in that: include: a hollow outer tube, wherein one end of the outer tube has a first opening for inserting the ureteral stent, and the other end has a second opening; as well as An inner tube is capable of extending into the outer tube from the second opening and is used to push the ureteral stent inserted into the first opening out of the first opening.

2. The ureteral stent retraction device according to claim 1, characterized in that: The outer diameter of the inner tube is smaller than or equal to the diameter of the first opening.

3. The ureteral stent retraction device according to claim 2, characterized in that: A first positioning hole penetrating through the wall of the outer tube is formed in the tube wall, and the first positioning hole is spaced apart from the first opening.

4. The ureteral stent retraction device according to claim 3, characterized in that: The distance between the first positioning hole and the first opening is 3 cm-5 cm.

5. The ureteral stent retraction device according to claim 3, characterized in that: The inner tube is a hollow structure, and a second positioning hole that cooperates with the first positioning hole is opened on the tube wall of the inner tube. When the inner tube is inserted into the outer tube from the second opening and the second positioning hole corresponds to the first positioning hole, the end face of the inner tube is flush with the first opening or extends out of the first opening.

6. The ureteral stent retraction device according to claim 5, characterized in that: One end of the inner tube adjacent to the second positioning hole is closed.

7. The ureteral stent retraction device according to any one of claims 1 to 6, characterized in that: One end of the outer tube adjacent to the first opening is configured in a tapered shape.

8. The ureteral stent retraction device according to any one of claims 1 to 6, characterized in that: The outer tube is a silicone tube, and / or the inner tube is a plastic tube.

9. The ureteral stent retraction device according to any one of claims 1 to 6, characterized in that: The tube wall of the outer tube and / or the inner tube is provided with marking scales.

10. The ureteral stent retraction device according to any one of claims 1 to 6, characterized in that: The diameter of the first opening is 1 mm-2.7 mm.

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