A magnetic stapler for ureteral stricture
By using a magnetic stapler to perform magnetic anastomosis in the ureteral stenosis section, the problem of possible re-stenosis after suture and difficulty in operation is solved, and the effect of simplifying surgery and reducing risks is achieved.
Patent Information
- Application Number
- CN202421314101.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-11
AI Technical Summary
After suturing the ureteral stenosis, stenosis may be formed again due to scar hyperplasia, and the suture operation is difficult, and the prognosis is greatly affected by the proficiency of the surgeon.
A magnetic stapler is adopted, including a double J tube, a child magnet, a female magnet and a safety piece, to achieve ureteral anastomosis through magnetic connections to avoid suturing in a narrow ureter.
The surgical process is simplified, the operation time is reduced, foreign matter residues such as sutures are avoided, and the risk of scar formation and restenosis is reduced.
Smart Images
Figure CN222737933U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ureteral anastomosis, in particular to a magnetic anastomosis device used for a ureteral stricture segment. Background Art
[0002] Ureteral stenosis is one of the most common and difficult complications after kidney transplantation, with a total incidence of 1%-10%. About 75%-90% of stenosis occurs at the distal end of the ureter, and ureterocystostomy is the most common. In the prior art, after surgical resection of the stenosis, the ureter is usually sutured by laparoscopy. The sutured ureter may become stenotic again due to scar hyperplasia, and the suture operation is difficult. The prognosis is greatly affected by the proficiency of the surgeon. Utility Model Content
[0003] In view of the above problems, the present application provides a magnetic stapler for the stricture segment of the ureter, which is used to solve the technical problems that when suturing the ureter through laparoscopy, the ureter may become stricture again due to scar hyperplasia after suturing, the suturing operation is difficult, and the prognosis is greatly affected by the proficiency of the surgeon.
[0004] To achieve the above-mentioned purpose, the utility model provides a magnetic stapler for a ureteral stenosis segment, comprising a double J tube, a sub-magnet, a mother magnet and a safety piece, the double J tube comprising a first J tube, a connecting tube and a second J tube connected in sequence, the first J tube and the second J tube having opposite bending directions; the sub-magnet is sleeved outside the connecting tube and close to the first J tube, the sub-magnet is fixedly connected to the connecting tube; the mother magnet is sleeved outside the connecting tube and slidably connected to the connecting tube, the mother magnet is magnetically connected to the sub-magnet; the safety piece is sleeved outside the connecting tube and located between the sub-magnet and the mother magnet, the safety piece is slidably connected to the connecting tube.
[0005] Different from the prior art, the above technical solution is provided with a sub-magnet and a mother magnet that are magnetically matched, and a safety piece is provided between the sub-magnet and the mother magnet, and the safety piece is used to prevent the sub-magnet and the mother magnet from accidentally contacting each other when the appropriate position is not adjusted during the operation. Therefore, when the ureter is anastomosed under laparoscopy, the original suture is replaced by magnetic anastomosis, thereby avoiding suture in the narrow ureter, simplifying the surgical process, reducing the operation time, avoiding the residue of foreign matter such as sutures, and avoiding scar formation and restenosis.
[0006] As an implementation mode of the present utility model, an opening is provided on the side of the safety member.
[0007] In this way, the side opening can facilitate the opening and removal of the safety piece from the double J tube under laparoscopy, thereby eliminating the barrier between the daughter magnet and the mother magnet, and making the daughter magnet and the mother magnet attract and match each other.
[0008] As an implementation mode of the utility model, the sub-magnet and the mother magnet are both in the shape of a bullet head, and the opposite surface of the sub-magnet and the mother magnet is the surface with a larger diameter.
[0009] Thus, the bullet head has a side with a larger diameter and a side with a smaller diameter, wherein the sub-magnet faces the side with a larger diameter of the mother magnet. When the sub-magnet and the mother magnet cooperate with the ureter, since the ureter is a muscular tube with a contraction function, the ureter can wrap the sub-magnet and the mother magnet well, and the side with a larger diameter can just cooperate with the ureter to prevent the magnet from detaching, so that the sub-magnet and the mother magnet can be more stably in a narrow position.
[0010] As an implementation mode of the utility model, the larger diameter of the sub-magnet and the mother magnet is 4-6 mm, and the height is 7-9 mm.
[0011] In this way, the size of the sub-magnet and the mother magnet can be set according to actual conditions. Preferably, the larger diameter of the sub-magnet and the mother magnet is set to 4 mm and the height is set to 8 mm.
[0012] As an implementation mode of the utility model, at least one first drainage hole is formed on the first J-tube, and at least one second drainage hole is formed on the second J-tube.
[0013] In this way, urine is drained by providing the first drainage hole and the second drainage hole.
[0014] As an implementation mode of the present invention, the first J-tube and the second J-tube are both three-quarter arcs.
[0015] Thus, the first J tube and the second J tube are J-shaped so that the two ends of the double J tube are fixed at different positions of the ureter, thereby preventing the position of the magnetic stapler from changing. Preferably, the first J tube and the second J tube are set to be three-quarters of a circle.
[0016] As an implementation mode of the utility model, the first J-tube is provided with two first drainage holes spaced 60 degrees apart, and the second J-tube is provided with two second drainage holes spaced 60 degrees apart.
[0017] In this way, a better drainage effect is achieved by providing two first drainage holes spaced 60 degrees apart and two second drainage holes spaced 60 degrees apart.
[0018] As an implementation mode of the present utility model, the diameter of the first drainage hole and the second drainage hole is 1.5 mm.
[0019] In this way, the diameters of the first drainage hole and the second drainage hole can be set according to actual conditions. Preferably, the diameters of the first drainage hole and the second drainage hole are set to 1.5 mm.
[0020] As an implementation mode of the present invention, the aperture of the double J tube is 2.5 mm, and the aperture of the mother magnet is 3 mm.
[0021] Thus, the aperture of the mother magnet is set to be slightly larger than the aperture of the double J tube, so that the mother magnet can slide relative to the double J tube. Preferably, the aperture of the double J tube is set to be 2.5 mm, and the aperture of the mother magnet is set to be 3 mm.
[0022] As an implementation mode of the present utility model, the length of the safety piece is 4 mm.
[0023] Thus, in order to ensure the safety distance of the safety piece and the magnetic matching between the sub-magnet and the mother magnet after the safety piece is removed, the length of the safety piece is preferably set to 4 mm.
[0024] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the following is an explanation in combination with the specific implementation method and drawings of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and shall not be considered as limitations of the present application.
[0026] In the drawings of the specification:
[0027] Figure 1 This is a schematic diagram of a magnetic stapler fixed to the renal pelvis, ureter and bladder according to an embodiment of the present application;
[0028] Figure 2 Another schematic diagram of a magnetic stapler fixed to the renal pelvis, ureter and bladder according to an embodiment of the present application;
[0029] Figure 3 A schematic diagram of a magnetic stapler according to an embodiment of the present application;
[0030] Figure 4 for Figure 3 A magnified view of middle;
[0031] Figure 5 A schematic diagram of a safety element according to an embodiment of the present application.
[0032] The reference numerals in the above drawings are described as follows:
[0033] 100-magnetic stapler; 200-renal pelvis and ureter; 300-bladder; 1-double J tube; 11-first J tube; 111-first drainage hole; 112-first bending portion; 12-connecting tube; 13-second J tube; 131-second drainage hole; 132-second bending portion; 2-sub-magnet; 3-mother magnet; 4-safety piece; 41-opening. DETAILED DESCRIPTION
[0034] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0035] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.
[0036] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.
[0037] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.
[0038] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.
[0039] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.
[0040] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.
[0041] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0042] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0043] According to some embodiments of the present application, please refer to Figures 1 to 5The present embodiment relates to a magnetic stapler 100 for a ureteral stricture, comprising a double J tube 1, a sub-magnet 2, a mother magnet 3 and a safety member 4. The double J tube 1 comprises a first J tube 11, a connecting tube 12 and a second J tube 13 connected in sequence. One end of the first J tube 11 is provided with a first bending portion 112, and the first bending portion 112 is used to be placed in the renal pelvis ureter 200. The other end of the first J tube 11 is connected to the connecting tube 12. One end of the second J tube 13 is provided with a second bending portion 132, and the second bending portion 132 is used to be placed in the bladder 300. The other end of the second J-tube 13 is connected to the connecting tube 12, and the bending directions of the first bending portion 112 of the first J-tube 11 and the second bending portion 132 of the second J-tube 13 are opposite; the sub-magnet 2 is sleeved outside the connecting tube 12 and close to the first J-tube 11, and the sub-magnet 2 is fixedly connected to the connecting tube 12; the mother magnet 3 is sleeved outside the connecting tube 12 and slidably connected to the connecting tube 12, and the mother magnet 3 is magnetically connected to the sub-magnet 2; the safety piece 4 is sleeved outside the connecting tube 12 and is located between the sub-magnet 2 and the mother magnet 3, and the safety piece 4 is slidably connected to the connecting tube 12.
[0044] The inner aperture of the double J tube 1 is the same and can be integrally formed. The double J tube 1 is made of a polymer toughness material that is not easy for stones to adhere to, which can be a polyurethane polymer material. Polyurethane polymer materials have the advantages of strong anti-aging, good tissue compatibility, non-toxicity, extremely smooth surface and low tendency to crust. The length of the double J tube 1 is 22-30cm, and the specific length can be determined according to actual conditions. The two ends of the connecting tube 12 are respectively the first J tube 11 and the second J tube 13, wherein the first J tube 11 is used to be placed in the renal pelvis ureter 200 through the first bending portion 112, and the second J tube 13 is used to be placed in the bladder 300 through the second bending portion 132. Optionally, the insertion position of the first J tube 11 and the second J tube 13 can be determined according to the stenosis of the ureter (such as the renal pelvis ureter 200, the ureter across the iliac vessels, and the ureter bladder 300).
[0045] The sub-magnet 2 and the mother magnet 3 are made of NdFeB permanent magnets (with extremely high magnetic energy product and coercive force, which can absorb objects 640 times their own weight) and are coated with titanium nitride or nickel plating for protection. The sub-magnet 2 is close to the first J-tube 11, and the mother magnet 3 is close to the second J-tube 13.
[0046] The safety piece 4 is made of silicone material and can be a hollow cylinder. The safety piece 4 plays a blocking role and is convenient for subsequent removal. When removing, the safety piece 4 can be directly cut off with surgical scissors and then removed.
[0047] Since both the mother magnet 3 and the safety member 4 can be slidably connected relative to the connecting tube 12, their positions on the connecting tube 12 can be adjusted, so that the mother magnet 3 and the sub-magnet 2 can be adjusted to appropriate positions.
[0048] The above technical solution is provided with a sub-magnet 2 and a mother magnet 3 that are magnetically matched, and a safety member 4 is provided between the sub-magnet 2 and the mother magnet 3, and the safety member 4 is used to prevent the sub-magnet 2 and the mother magnet 3 from accidentally contacting each other when the appropriate positions are not adjusted during the operation. Therefore, when the ureter is anastomosed under laparoscopy, the original suture is replaced by magnetic anastomosis, thereby avoiding suture in a narrow ureter, simplifying the surgical process, reducing the surgical time, avoiding the residue of foreign matter such as sutures, and avoiding scar formation and restenosis.
[0049] According to some embodiments of the present application, optionally, Figure 5 As shown, an opening 41 is provided on the side of the safety member 4 .
[0050] Optionally, the shape of the safety member 4 corresponds to the shape of the connecting tube 12, that is, the inner wall of the safety member 4 contacts the outer wall of the connecting tube 12. And to prevent it from falling from the connecting tube 12, its side opening 41 cannot be too large.
[0051] Thus, the side opening 41 can facilitate opening and removing the safety member 4 from the double J tube 1 under laparoscopy, thereby eliminating the barrier between the sub-magnet 2 and the mother magnet 3, so that the sub-magnet 2 and the mother magnet 3 attract and match each other.
[0052] According to some embodiments of the present application, optionally, Figures 1 to 3 As shown, the sub-magnet 2 and the mother magnet 3 are both in the shape of a bullet head, and the opposite surface of the sub-magnet 2 and the mother magnet 3 is the surface with a larger diameter.
[0053] In this way, the bullet head has a side with a larger diameter and a side with a smaller diameter, wherein the side with a larger diameter of the sub-magnet 2 faces the side with a larger diameter of the mother magnet 3. When the sub-magnet 2 and the mother magnet 3 cooperate with the ureter, since the ureter is a muscular tube with a contraction function, the ureter can wrap the sub-magnet 2 and the mother magnet 3 well, and the side with a larger diameter can just cooperate with the ureter to prevent the magnet from detaching, so that the sub-magnet 2 and the mother magnet 3 can be more stably in a narrow position.
[0054] According to some embodiments of the present application, optionally, the larger diameter of the sub-magnet 2 and the mother magnet 3 is 4-6 mm, and the height is 7-9 mm.
[0055] In this way, the size of the sub-magnet 2 and the mother magnet 3 can be set according to actual conditions. Preferably, the maximum diameter of the sub-magnet 2 and the mother magnet 3 is set to 4 mm, and the height is set to 8 mm.
[0056] According to some embodiments of the present application, optionally, Figure 3 As shown, at least one first drainage hole 111 is formed on the first J-tube 11 , and at least one second drainage hole 131 is formed on the second J-tube 13 .
[0057] In this way, urine is drained by providing the first drainage hole 111 and the second drainage hole 131 .
[0058] According to some embodiments of the present application, optionally, Figure 3 As shown, the first J-tube 11 and the second J-tube 13 are both three-quarter arcs.
[0059] In this way, the first J tube 11 and the second J tube 13 are J-shaped so that the two ends of the double J tube 1 are fixed at different positions of the ureter to prevent the position of the magnetic stapler 100 from changing. The arc lengths of the first J tube 11 and the second J tube 13 can be determined according to actual conditions. Preferably, the first J tube 11 and the second J tube 13 are set to be three-quarter arcs.
[0060] According to some embodiments of the present application, optionally, Figure 3 As shown, the first J-tube 11 is provided with two first drainage holes 111 spaced 60 degrees apart, and the second J-tube 13 is provided with two second drainage holes 131 spaced 60 degrees apart.
[0061] Taking the clock direction as an example, the two first drainage holes 111 are respectively disposed at the 12 o'clock and 3 o'clock positions of the first J-tube 11 , and the two second drainage holes 131 are respectively disposed at the 6 o'clock and 9 o'clock positions.
[0062] Thus, a better drainage effect is achieved by providing two first drainage holes 111 spaced 60 degrees apart and two second drainage holes 131 spaced 60 degrees apart.
[0063] According to some embodiments of the present application, optionally, the diameter of the first drainage hole 111 and the second drainage hole 131 is 1.5 mm.
[0064] In this way, the diameters of the first drainage hole 111 and the second drainage hole 131 can be set according to actual conditions. Preferably, the diameters of the first drainage hole 111 and the second drainage hole 131 are set to 1.5 mm.
[0065] According to some embodiments of the present application, optionally, the aperture of the double J tube 1 is 2.5 mm, and the aperture of the mother magnet 3 is 3 mm.
[0066] In this way, the aperture of the mother magnet 3 is set to be slightly larger than the aperture of the double J tube 1, so that the mother magnet 3 can slide relative to the double J tube 1. Preferably, the aperture of the double J tube 1 is set to 2.5 mm, and the aperture of the mother magnet 3 is set to 3 mm. The sub-magnet 2 is fixedly mounted on the connecting tube 12, so the aperture of the sub-magnet 2 can be the same as the aperture of the double J tube 1, which is 2.5 mm.
[0067] According to some embodiments of the present application, optionally, the length of the safety member 4 is 4 mm.
[0068] Thus, in order to ensure the safety distance of the safety element 4 and the magnetic matching between the sub-magnet 2 and the mother magnet 3 after the safety element 4 is removed, preferably, the length of the safety element 4 is set to 4 mm.
[0069] The magnetic stapler 100 for ureteral stricture can be a disposable product when actually used. After the ureteral stricture is removed, the magnetic stapler 100 is inserted into the ureter. Specifically, Figure 1 As shown, one end of the double J tube 1 (i.e., the first J tube 11) is inserted from the proximal end of the ureter to the renal pelvis ureter 200. The ureter is a muscular tube, and the edge of the broken end wraps the sub-magnet 2. The other end of the double J tube 1 (i.e., the second J tube 13) is inserted into the distal ureter, and the edge of the broken end of the ureter wraps the mother magnet 3. At this time, the sub-magnet 2 and the mother magnet 3 are blocked by the safety member 4. After the sub-magnet 2 is aligned with the mother magnet 3 under the action of the safety member 4 (i.e., the two ends of the safety member 4 are in contact with the larger diameter side of the sub-magnet 2 and the mother magnet 3 respectively), the safety member 4 is removed, as shown in FIG. Figure 2 As shown, under the action of magnetic force, the mother magnet 3 and the daughter magnet 2 attract each other and make the ureteral serosal layer end to end anastomosed, and the double J tube 1 can play the role of drainage and expansion. One month after the operation, due to the continuous pressure, the tissue between the mother magnet 3 and the daughter magnet 2 can be ischemic and necrotic (the mother magnet 3 and the daughter magnet 2 will clamp part of the tissue when they are magnetically attracted), and the necrotic tissue is separated and falls off from the tissue outside the magnet. The ureter outside the magnet has healed and is in an expanded state. At this time, the double J tube 1 is removed through the urethra cystoscope (this operation also exists in conventional surgery), and no foreign matter remains in the body.
[0070] The above method simplifies the open / laparoscopic ureteral anastomosis operation process, avoids suturing in the narrow ureter, and changes to inserting the magnetic stapler 100 from the narrow resection position to complete the anastomosis, thereby simplifying the surgical process, reducing the operation time, avoiding the residue of foreign matter such as sutures, and avoiding scar formation and restenosis.
[0071] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.
[0072] Finally, it should be noted that 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
Claims
1. A magnetic stapler for ureteral stenosis, characterized in that: include: A double J tube, the double J tube comprising a first J tube, a connecting tube and a second J tube connected in sequence, one end of the first J tube is provided with a first bending portion, the first bending portion is used to be placed in the renal pelvis ureter, the other end of the first J tube is connected to the connecting tube, one end of the second J tube is provided with a second bending portion, the second bending portion is used to be placed in the bladder, the other end of the second J tube is connected to the connecting tube, and the first bending portion of the first J tube and the second bending portion of the second J tube have opposite bending directions; A sub-magnet, the sub-magnet is sleeved outside the connecting tube and close to the first J-tube, and the sub-magnet is fixedly connected to the connecting tube; A mother magnet, which is sleeved outside the connecting tube and slidably connected to the connecting tube, and the mother magnet is magnetically connected to the sub-magnet; as well as A safety piece is sleeved outside the connecting tube and is located between the sub-magnet and the mother magnet. The safety piece is slidably connected to the connecting tube.
2. The magnetic stapler for ureteral stricture according to claim 1, characterized in that: The side surface of the safety piece is provided with an opening.
3. The magnetic stapler for ureteral stricture according to claim 1, characterized in that: The sub-magnet and the mother magnet are both in the shape of a bullet head, and the opposite surface of the sub-magnet and the mother magnet is the surface with a larger diameter.
4. The magnetic stapler for ureteral stricture according to claim 3, characterized in that: The larger diameter of the sub-magnet and the mother magnet is 4-6 mm, and the height is 7-9 mm.
5. The magnetic stapler for ureteral stricture according to claim 1, characterized in that: The first J-tube is provided with at least one first drainage hole, and the second J-tube is provided with at least one second drainage hole.
6. The magnetic stapler for ureteral stricture according to claim 5, characterized in that: The first J-tube and the second J-tube are both three-quarter arcs.
7. The magnetic stapler for ureteral stricture according to claim 6, characterized in that: The first J-tube is provided with two first drainage holes spaced 60 degrees apart, and the second J-tube is provided with two second drainage holes spaced 60 degrees apart.
8. The magnetic stapler for ureteral stricture according to claim 5, characterized in that: The diameters of the first drainage hole and the second drainage hole are 1.5 mm.
9. The magnetic stapler for ureteral stricture according to claim 1, characterized in that: The aperture of the double J tube is 2.5 mm, and the aperture of the mother magnet is 3 mm.
10. The magnetic stapler for ureteral stricture according to claim 1, characterized in that: The length of the safety piece is 4 mm.