Magnetically-guided ureter bladder positioning traction device

Abstract

The utility model discloses a magnetically guided ureteral bladder positioning traction device, which belongs to the technical field of medical instruments and comprises a traction mechanism and a guide mechanism, and the traction mechanism and the guide mechanism are matched with each other through magnetic force and are used for positioning and traction operation in ureteral bladder surgery. The traction mechanism comprises a traction magnet which is in a semi-capsule shape, a traction binding hole is formed in one end of the traction magnet, the guiding mechanism comprises a guiding magnet which is in a semi-capsule shape, a guiding binding hole is formed in one end of the guiding magnet, and the faces, away from the traction binding hole and the guiding binding hole, of the traction magnet and the guiding magnet are connected in a matched mode. The traction mechanism can be operated by an operator, the traction mechanism and the guide mechanism which is placed in the bladder in advance are attracted mutually through magnetic force, so that the position of the bladder is rapidly determined, and key positioning information is provided for subsequent surgical operation.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and more specifically, to a magnetically guided ureterobladder positioning and traction device. Background Technology

[0002] In the field of urology, especially in ureterocystectomy, accurate localization and a good surgical field are crucial for surgical success. As a key organ in the urinary system, the bladder's position and condition can change due to various factors, posing numerous challenges to surgical procedures.

[0003] For patients with renal failure, long-term peritoneal or hemodialysis treatment significantly alters the physiological characteristics of their bladder. Normally, the bladder has a rhythmic expansion and contraction as urine fills and empties. However, in these patients, due to extremely low daily urine output, the bladder loses this normal filling-emptying rhythm and remains in a contracted state for extended periods. This reduces the elasticity and flexibility of the bladder muscles and tissues, weakens contractile force, and consequently leads to a smaller bladder volume and reduced capacity, sometimes as low as 50-100 ml. In routine kidney transplantation, ureterovesical anastomosis is a crucial step, requiring the anastomosis of the donor kidney's ureter to the recipient's bladder. However, traditional surgical methods face numerous challenges when dealing with patients with bladder contracture. Firstly, the conventional method of instilling saline solution to fill the bladder and expose it is ineffective, as even with saline injection, the bladder volume is insufficient for clear visualization. This forces surgeons to spend considerable time carefully locating and identifying the small bladder behind the pubic symphysis, increasing the surgical difficulty and time cost. On the other hand, the fat covering the outer serosal layer of the bladder is difficult to distinguish from the peritoneum. If the peritoneum is mistakenly opened as the bladder during surgery, it can easily lead to surgical complications. Moreover, even if the shrunken bladder is accurately located, its deep location in the anterior pelvic cavity and behind the pubic symphysis, coupled with the confined space, increases the risk of postoperative complications such as urinary fistula during ureterovesical anastomosis.

[0004] Furthermore, in the placement of ureteral stents, to prevent ureteral complications, a ureteral stent (double pigtail catheter or double J stent) is often inserted during the procedure, and a No. 1 silk suture is sutured at the end inserted into the bladder for postoperative removal. However, in cases of bladder contracture, inserting the suture along with the stent into the bladder becomes extremely difficult. This not only prolongs the operation time but may also lead to problems such as the suture getting knotted in the bladder or the stent's "pigtail" end becoming entangled, making it impossible to remove the stent through the suture, or even causing the stent to become stuck in the urethra. In such cases, cystoscopic surgery is often required to remove the retained stent, causing additional pain and financial burden to the patient. How to invent a magnetically guided ureterovesical positioning and traction device to improve these problems has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a magnetically guided ureterobladder positioning and traction device, which aims to improve the problem that it is very difficult to insert the suture along with the stent tube into the bladder in the case of bladder contracture.

[0006] This invention is achieved as follows: a magnetically guided ureterovesical positioning and traction device, comprising...

[0007] The traction mechanism and the guiding mechanism cooperate with each other through magnetic force for positioning and traction operations during ureterocystostomy.

[0008] The traction mechanism includes a traction magnet, which is semi-capsule shaped and has a traction binding hole at one end. The guiding mechanism includes a guiding magnet, which is also semi-capsule shaped and has a guiding binding hole at one end. The sides of the traction magnet and the guiding magnet that are away from the traction binding hole and the guiding binding hole are connected to each other.

[0009] In a preferred embodiment of this utility model, the traction magnet is in the shape of a semi-capsule, and a protrusion is provided at the end of the traction magnet away from the binding hole, the protrusion being in the shape of a semi-capsule.

[0010] In a preferred embodiment of this utility model, a traction connection hole is provided at the edge of the cross-section of the traction magnet.

[0011] In a preferred embodiment of this utility model, one end of the traction connection hole is located at the cross-section of the traction magnet, and the other end of the traction connection hole is located at the side wall of the traction magnet.

[0012] In a preferred embodiment of this utility model, the guiding magnet is in the shape of a semi-capsule, and a groove is provided at the end of the guiding magnet away from the guiding binding hole. The groove is a recessed semi-capsule shape, and the groove matches the protrusion of the traction magnet.

[0013] In a preferred embodiment of this utility model, a guide connection hole is provided at the edge of the cross-section of the guide magnet. The guide connection hole and the traction connection hole are arranged vertically and vertically respectively. One end of the guide connection hole is located at the cross-section of the guide magnet, and the other end of the guide connection hole is located at the side wall of the guide magnet. A connecting wire is provided through the middle of the traction connection hole and the guide connection hole.

[0014] In a preferred embodiment of this utility model, the traction magnet and the guide magnet are assembled into a complete capsule shape by N and S pole magnetic force. When the traction magnet and the guide magnet are assembled, the traction connection hole corresponds to the guide connection hole.

[0015] In a preferred embodiment of this utility model, the guiding mechanism further includes a urine catheter, the head of which is inserted into the groove of the guiding magnet and fits tightly, and the guiding binding hole is connected to a guiding wire to stably connect the guiding magnet and the urine catheter.

[0016] In a preferred embodiment of this utility model, the traction mechanism further includes a ureteral stent tube, and a traction wire is connected to the traction binding hole, with the other end of the traction wire connected to the ureteral stent tube.

[0017] In a preferred embodiment of this utility model, the traction wire is sewn to the bend at one end of the ureteral stent tube, and the fixing point is 8cm away from the traction magnet.

[0018] The beneficial effects of this invention are as follows: This invention provides a magnetically guided ureterobladder positioning and traction device. During use, the magnetic force between the traction magnet in the traction mechanism and the guiding magnet in the guiding mechanism accurately positions the bladder. During surgery, the guiding magnet is inserted transurethra, and the traction magnet is inserted transpelvically. The two attract each other, making the tissue between them the bladder tissue, thus solving the problem of bladder positioning during surgery in kidney transplant patients undergoing long-term dialysis. Magnetic force can pull the guiding magnet to the highest point of the bladder, and simultaneously pulling the traction wire on the traction magnet causes the bladder tissue to rise, achieving maximum bladder exposure. This provides a clear surgical field, helping the surgeon to perform the operation more accurately and efficiently, reducing surgical difficulty, and minimizing surgical risks caused by poor bladder location and visibility. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure provided by an embodiment of the present utility model;

[0021] Figure 2 A schematic diagram of the disassembled structure provided for an embodiment of this utility model;

[0022] Figure 3 A schematic diagram of the guiding magnet structure provided for an embodiment of this utility model;

[0023] Figure 4 A schematic diagram of the wire connection structure provided for an embodiment of this utility model;

[0024] Figure 5 A schematic diagram of the ureteral stent tube connection structure provided for an embodiment of this utility model.

[0025] In the diagram: 100 - traction mechanism; 110 - traction magnet; 120 - protrusion; 130 - traction binding hole; 140 - traction connection hole; 150 - connecting wire; 160 - traction wire; 170 - ureteral stent tube; 200 - guiding mechanism; 210 - guiding magnet; 220 - groove; 230 - guiding binding hole; 240 - guiding connection hole; 250 - urinary catheter; 260 - guiding wire. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] Please see Figures 1 to 3 This utility model provides a technical solution: a magnetically guided ureterovesical positioning and traction device, comprising...

[0028] The traction mechanism 100 and the guiding mechanism 200 cooperate with each other through magnetic force and are used for positioning and traction operations in ureterocystostomy.

[0029] The traction mechanism 100 includes a traction magnet 110, which is semi-capsule shaped and has a traction binding hole 130 at one end. The guiding mechanism 200 includes a guiding magnet 210, which is also semi-capsule shaped and has a guiding binding hole 230 at one end. The sides of the traction magnet 110 and the guiding magnet 210 that are away from the traction binding hole 130 and the guiding binding hole 230 are connected to each other.

[0030] The traction mechanism 100 can be operated by the surgeon to attract the guide mechanism 200 pre-placed in the bladder through magnetic force, thereby quickly determining the position of the bladder and providing key positioning information for subsequent surgical operations. At the same time, it can also perform appropriate traction on the bladder to adjust its position, making the surgical area more clearly visible, which greatly improves the accuracy and efficiency of the operation.

[0031] Please see Figures 2 to 5 The traction magnet 110 is semi-capsule shaped, and a protrusion 120 is provided at the end of the traction magnet 110 away from the traction binding hole 130. The protrusion 120 is semi-capsule shaped. A traction connection hole 140 is provided at the edge of the cross-section of the traction magnet 110.

[0032] One end of the traction connection hole 140 is located at the cross-section of the traction magnet 110, and the other end of the traction connection hole 140 is located on the side wall of the traction magnet 110. The guide magnet 210 is semi-capsule shaped, and a groove 220 is provided at the end of the guide magnet 210 away from the guide binding hole 230. The groove 220 is a recessed semi-capsule shape, and the groove 220 matches the protrusion 120 of the traction magnet 110, which can ensure that the magnetic force transmission between the magnets is more uniform and stable, thereby improving the accuracy and reliability of the entire device in positioning and traction of the bladder.

[0033] A guide connection hole 240 is provided at the edge of the cross-section of the guide magnet 210. The guide connection hole 240 and the traction connection hole 140 are arranged vertically and vertically respectively. One end of the guide connection hole 240 is located on the cross-section of the guide magnet 210, and the other end is located on the side wall of the guide magnet 210. A connecting wire 150 is threaded through the middle of the traction connection hole 140 and the guide connection hole 240, so that the two magnets can withstand a certain amount of external force during surgery without easily separating. The traction magnet 110 and the guide magnet 210 are assembled into a complete capsule shape by the magnetic force of the N and S poles. When the traction magnet 110 and the guide magnet 210 are assembled, the traction connection hole 140 corresponds to the guide connection hole 240. The complete capsule-shaped structure can also protect the internal tissues and organs to a certain extent, avoiding accidental damage to them by surgical instruments or other factors, and providing a safer operating environment for surgery.

[0034] The guiding mechanism 200 also includes a urinary catheter 250, the head of which is inserted into the groove 220 of the guiding magnet 210 and fits tightly. A guiding wire 260 is connected to the guiding suture hole 230, ensuring a stable connection between the guiding magnet 210 and the urinary catheter 250. The traction mechanism 100 also includes a ureteral stent tube 170, with a traction wire 160 connected to the traction suture hole 130. The other end of the traction wire 160 is connected to the ureteral stent tube 170. The traction wire 160 is sewn to the bend at one end of the ureteral stent tube 170, and the fixing point is 8cm away from the traction magnet 110. This 8cm distance ensures that the ureteral stent tube 170 has sufficient length in the bladder for urine drainage without being too long and causing entanglement or affecting the surgical procedure.

[0035] Working principle:

[0036] Assembly and insertion of the guiding magnet 210 and the urinary catheter 250 (preoperative preparation stage)

[0037] Assembly Process: Under aseptic conditions, the tip of the urinary catheter 250 is inserted into the groove 220 of the guide magnet 210. Because the groove 220 fits the shape of the tip of the urinary catheter 250, the two can be tightly joined. Then, a guide wire 260 is passed through the guide binding hole 230 of the guide magnet 210 and knotted for fixation. The other end of the guide wire 260 is placed along the outer wall of the urinary catheter 250, and a hemostat is used to clamp the urinary catheter 250 and the guide wire 260 at the end. At this point, the downward pulling force from the hemostat and the upward pushing force from the top of the urinary catheter 250 form a balanced force, allowing the guide magnet 210 to be stably connected to the urinary catheter 250.

[0038] Insertion Procedure: After thoroughly lubricating the urinary catheter 250 and its connecting components, insert the urinary catheter 250 and the guiding magnet 210 with the guide wire 260 together through the urethra into the patient's body. During insertion, the urinary catheter 250 will carry the guiding magnet 210 into the bladder. Once the urinary catheter 250 is successfully inserted, release the hemostat. At this point, the guiding magnet 210 will detach from the urinary catheter 250 under its own weight and the influence of the bladder environment, while the guiding wire 260 will remain outside the body. The guiding wire 260 plays an important role in positioning and traction during subsequent surgical procedures and stent removal.

[0039] Insertion of traction magnet 110 and bladder positioning and traction (operative stage)

[0040] Placement and positioning of the traction magnet 110: When the surgery reaches the point where the transplanted kidney and ureter need to be anastomosed, a three-way stopcock is used to infuse normal saline through the urethra to maintain a certain degree of bladder fullness, facilitating the operation. The traction suture 160 is passed through the traction binding hole 130 at one end of the traction magnet 110 and secured with a knot. The traction magnet 110 is placed into the pelvic cavity with one hand, while the other hand pulls on the secured traction suture 160, causing the traction magnet 110 to attract and search for the guide magnet 210 located in the bladder within the surgical area. Because the traction magnet 110 and the guide magnet 210 are separate semi-capsule shapes and possess magnetism, they can attract each other through the magnetic force between their N and S poles. When they are attracted together, the tissue separating them is the bladder tissue, thus achieving accurate positioning of the bladder.

[0041] Bladder traction and exposure: Continue to pull on the traction wire 160 on the traction magnet 110. Due to the magnetic force between the traction magnet 110 and the guide magnet 210, the bladder tissue will be pulled upwards. Because the guide magnet 210 can move within the bladder, by reasonably adjusting the traction force and direction, the guide magnet 210 can be pulled to the highest point of the bladder. At this point, the bladder can achieve maximum exposure, providing a good field of vision for subsequent surgical procedures such as ureterovesical anastomosis.

[0042] Insertion and magnetic fixation of a 170mm ureteral stent (key surgical step)

[0043] Preparation for stent placement: After satisfactory bladder traction, assess the distance between the transplanted kidney and the bladder, trim excess ureter and cut it 0.3 cm at an angle to better anastomose with the bladder mucosa. Prepare to insert the 6F ureteral stent tube 170 into the ureteral lumen, ensuring that the curvature of its head is accurately positioned in the renal pelvis.

[0044] Connection and fixation of the stent tube to the traction magnet 110: The traction wire 160 bound to the traction magnet 110 is threaded through a small round needle and then sewn to the bend at the other end of the urinary stent tube 170. When tying the knot for fixation, the fixation point is precisely controlled at 8cm from the traction magnet 110. This distance was determined through extensive clinical practice and research, ensuring that the urinary stent tube 170 is in the appropriate position during subsequent procedures, which is beneficial for urine drainage and surgical outcomes.

[0045] Using an electrocautery knife, the bladder wall tissue between the forceps was incised. A small hemostat was used to bluntly separate the bladder muscle layer, exposing the blue bladder mucosa. A sharp scalpel was used to puncture the bladder mucosa layer, and a micro-curved forceps was used to fix the mucosa layer. At this point, the traction magnet 110 was inserted into the opening of the bladder mucosa. Under the action of magnetic force, the traction magnet 110 and the guide magnet 210 attracted and engaged. Then, the positions of the two magnets were rotated and adjusted so that the traction connection hole 140 at the edge of the cross-section of the two magnets connected with the guide connection hole 240. A new connecting thread 150 was passed through the two fixing holes and knotted, and excess thread was cut off. At this point, under the action of magnetic force, the groove 220 of the guide magnet 210, the protrusion 120 of the traction magnet 110, and the knot between the fixing holes, the two magnets were tightly fitted together, forming a capsule-shaped, integrated magnet structure. This structure not only stabilized the connection between the magnets but also provided a reliable foundation for subsequent surgical operations and the fixation of the ureteral stent tube 170.

[0046] Ureterovesical anastomosis and postoperative management (completion stage of surgery)

[0047] Ureterovesical anastomosis procedure: A capsule-shaped magnet is placed inside the bladder. The ureteral mucosa and bladder mucosa are intermittently sutured using 5-0 Monocryl sutures to ensure a tight and patent connection between the ureter and bladder, preventing urine leakage. Next, the bladder muscle layer is intermittently sutured using 3-0 Vicryl sutures to cover the anastomosis, further strengthening the anastomosis site and promoting healing.

[0048] Postoperative routine management and the principle of stent removal: Routine hemostasis is performed, and a drainage tube is placed to drain blood and exudate from the surgical area, preventing complications such as infection caused by fluid accumulation. The incision is then sutured layer by layer to complete the surgery. Postoperatively, when the patient has recovered well and the ureteral stent 170 needs removal, because the guide wire 260 of the guiding magnet 210 is always outside the body, it is not necessary to wait for the patient to expel the wire through urination as in traditional methods. Directly pulling the guide wire 260 outside the urethra will first pull the capsule-shaped magnet out of the urethra as a whole. During the magnet's withdrawal, it dilates the urethra, providing guidance and space for the subsequent removal of the ureteral stent 170. Continued pulling of the traction wire 160 will then smoothly pull the ureteral stent 170 out of the urethra. This method avoids problems such as kinking or jamming of the ureteral stent 170, improves the success rate of stent removal, reduces the risk of repeat surgery due to stent retention, and is beneficial to the patient's postoperative recovery.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A magnetically guided ureterovesical positioning and traction device, characterized in that, include The traction mechanism and the guiding mechanism cooperate with each other through magnetic force for positioning and traction operations during ureterocystostomy. The traction mechanism includes a traction magnet, which is semi-capsule shaped and has a traction binding hole at one end. The guiding mechanism includes a guiding magnet, which is also semi-capsule shaped and has a guiding binding hole at one end. The sides of the traction magnet and the guiding magnet that are away from the traction binding hole and the guiding binding hole are connected to each other.

2. The magnetically guided ureterovesical positioning and traction device as described in claim 1, characterized in that: The traction magnet is semi-capsule shaped, and a protrusion is provided at the end of the traction magnet away from the binding hole, and the protrusion is semi-capsule shaped.

3. The magnetically guided ureterovesical positioning and traction device as described in claim 2, characterized in that: The traction magnet has a traction connection hole at the edge of its cross-section.

4. The magnetically guided ureterovesical positioning and traction device as described in claim 3, characterized in that: One end of the traction connection hole is located at the cross-section of the traction magnet, and the other end of the traction connection hole is located on the side wall of the traction magnet.

5. The magnetically guided ureterovesical positioning and traction device as described in claim 3, characterized in that: The guide magnet is semi-capsule shaped, and a groove is provided at the end of the guide magnet away from the guide binding hole. The groove is a recessed semi-capsule shape, and the groove matches the protrusion of the traction magnet.

6. The magnetically guided ureterovesical positioning and traction device as described in claim 5, characterized in that: The guide magnet has a guide connection hole at the edge of its cross-section. The guide connection hole and the traction connection hole are arranged vertically and vertically respectively. One end of the guide connection hole is located at the cross-section of the guide magnet, and the other end of the guide connection hole is located at the side wall of the guide magnet. A connecting wire is provided through the middle of the traction connection hole and the guide connection hole.

7. The magnetically guided ureterovesical positioning and traction device as described in claim 6, characterized in that: The traction magnet and the guide magnet are assembled into a complete capsule shape by N and N pole magnetic force. When the traction magnet and the guide magnet are assembled, the traction connection hole corresponds to the guide connection hole.

8. The magnetically guided ureterovesical positioning and traction device as described in claim 5, characterized in that: The guiding mechanism also includes a urinary catheter, the head of which is inserted into the groove of the guiding magnet and fits tightly. The guiding binding hole is connected to a guiding wire to ensure a stable connection between the guiding magnet and the urinary catheter.

9. The magnetically guided ureterovesical positioning and traction device as described in claim 5, characterized in that: The traction mechanism also includes a ureteral stent tube, and a traction wire is connected to the traction binding hole. The other end of the traction wire is connected to the ureteral stent tube.

10. The magnetically guided ureterovesical positioning and traction device as described in claim 9, characterized in that: The traction wire is sewn to the bend at one end of the ureteral stent tube, and the fixing point is 8cm away from the traction magnet.

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