A laparoscopic surgery double J tube placement guide

Abstract

The present application relates to the technical field of medical devices, in particular to a laparoscopic surgery double J tube placement guide, comprising a guide body, a puncture core and a sealing cap, one end of the guide body is provided with a blunt circular opening, the other end of the guide body is threadedly connected with the sealing cap; the puncture core is in sliding fit with the inner wall of the guide body, and the end of the puncture core close to the blunt circular opening is in blunt conical shape; the sealing pad is embeddedly installed in the sealing cap, and a cross-shaped fissure is formed in the center of the sealing pad; after the puncture core is pulled out, a channel is formed in the guide body for the double J tube to pass through. The present application is used for improving the operation efficiency and safety and ensuring the operation continuity.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a double-J stent placement guide for laparoscopic surgery. Background Technology

[0002] Double-J stents, also known as ureteral stents or pigtail catheters, are named for their "J"-shaped or pigtail-like ends. The coiled design at the proximal (renal pelvis) and distal (bladder) ends utilizes the natural clamping action of anatomical structures to achieve self-fixation, preventing displacement or dislodgement within the body. Double-J stents are typically made of polyurethane, silicone, or special polymer materials, possessing excellent biocompatibility, flexibility, and shape memory. The surface of the stent is often coated with a hydrophilic coating to reduce friction, and some high-end products also incorporate antibacterial or anti-caking components.

[0003] Currently, the most common clinical methods for double-J stent placement are insertion via suction tubes and direct insertion using trocars. However, some existing suction tubes typically have a diameter greater than 10F, while the diameter of double-J stents is only 4.7F to 6F. This size mismatch leads to significant oscillation of the double-J stent within the tube, making it difficult to control its direction of insertion. Furthermore, the suction tube itself lacks an airtight device, causing continuous leakage of CO2 gas used to maintain the surgical field of view during insertion along the gap between the tube wall and the double-J stent. This results in unstable pneumoperitoneum pressure, affecting the surgical field of view and even requiring a pause in the procedure for re-inflation, thus prolonging the operation time. Trocars, on the other hand, are shorter (usually 5–10 cm), with their ports located far from the ureteral incision, making it difficult for the surgeon to precisely adjust the direction of the double-J stent's entry into the ureter within the confined abdominal cavity. Additionally, the inner diameter of the trocar is much larger than that of the double-J stent, causing significant lateral oscillation during insertion, which not only increases the difficulty of directional control but also increases the risk of unnecessary contact or scratching of surrounding tissues.

[0004] Therefore, this invention proposes a double-J stent placement guide for laparoscopic surgery that can safely, quickly, and stably complete the placement of a double-J stent. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a double-J stent placement guide for laparoscopic surgery, which improves surgical efficiency and safety while ensuring operational continuity.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A laparoscopic double-J stent placement guide includes a guide body, a puncture core, and a sealing cap. One end of the guide body has a blunt opening, and the other end of the guide body is threaded into the sealing cap. The puncture core slides against the inner wall of the guide body, and the end of the puncture core near the blunt opening is a blunt cone shape. A sealing gasket is embedded inside the sealing cap, and a cross-shaped slit is opened in the center of the sealing gasket. When the puncture core is withdrawn from the guide body, a channel for the double-J stent to pass through is formed inside the guide body.

[0007] The technical principles of the above solution are as follows:

[0008] The blunt, conical tip of the puncture core safely penetrates the abdominal wall, creating a channel for the insertion of a double-J catheter. A sealing cap connects to the cavity to ensure airtightness, while an internal cross-shaped slit sealing pad automatically closes to prevent air leakage while allowing the catheter to pass through, maintaining stable pneumoperitoneum. The overall structure integrates puncture, guidance, and sealing, ensuring accurate, safe, and rapid insertion of the double-J catheter under laparoscopy, thereby improving surgical efficiency and safety.

[0009] The above approach has the following beneficial effects:

[0010] 1. This procedure employs a sliding engagement between the puncture core and the guide body. The tip of the puncture core is a blunt cone, which bluntly separates rather than cuts the muscles and fascia tissues when penetrating the abdominal wall, resulting in low puncture resistance and minimal bleeding, effectively reducing abdominal wall damage and postoperative pain. The guide body has a blunt opening at the front end, which prevents scratching of the intestines, blood vessels, or ureteral walls when moved after insertion into the abdominal cavity. This design is suitable for pediatric procedures in confined spaces or complex cases, enhancing operational safety.

[0011] 2. This method achieves an airtight seal through the threaded engagement of the sealing cap with the rear end of the guide body and the cross-shaped slit structure in the center of the sealing pad. When no instruments are passing through, the cross-shaped slit closes to prevent leakage of abdominal gas; when the double-J tube passes through, the elastic sealing pad adheres tightly to the tube wall, maintaining an airtight seal. Compared to traditional methods using suction tubes or trocars, this method maintains stable pneumoperitoneum pressure, avoids blurred vision and surgical interruption due to air leakage, and ensures operational continuity.

[0012] 3. This solution integrates puncture, channel establishment, and sealing guidance functions into one, simplifying the operation process. A dedicated channel can be established with a single puncture, without the need to change instruments or make repeated attempts. The direction of the push process is stable. When used with instruments such as laparoscopes, it can be aligned with the ureteral incision, shortening the catheterization time and reducing the risk of anesthesia and the difficulty of the surgery. It is suitable for surgical scenarios involving delicate procedures such as ureteral reconstruction.

[0013] Furthermore, the guide body is made of a semi-soft medical material, which is either medical polyurethane or medical silicone.

[0014] Beneficial effects: Using semi-soft materials such as medical polyurethane or medical silicone, it combines flexibility and support, which can conform to the anatomical curvature of the abdominal cavity, avoid damage to the ureteral mucosa and surrounding tissues by rigid instruments, and maintain the channel shape to prevent the double J stent from twisting and folding, thus improving the safety and efficiency of catheterization.

[0015] Furthermore, the inner diameter of the guide body is 1.6-2.35mm, the outer diameter is 2.0-3.0mm, and the length is 10-15cm.

[0016] Beneficial effects: This size design matches the commonly used double-J tube specifications. The inner diameter ensures smooth passage of the stent tube and avoids excessive shaking, while the outer diameter enables minimally invasive puncture and reduces abdominal wall damage. The length is adapted to the abdominal wall thickness of patients of different body types, ensuring that the channel can stably reach the ureteral opening while avoiding excessive length that would cause redundant bending in the abdominal cavity, thus balancing operational flexibility and airtightness.

[0017] Furthermore, the sealing gasket is made of silicone or rubber sheet. The cross-shaped slit is closed when no instrument passes through, and it elastically deforms and adheres tightly to the tube wall when the puncture core or double J tube passes through, forming an airtight seal.

[0018] Beneficial effects: The cross-shaped slit silicone / rubber sealing gasket utilizes the elasticity of the material to achieve self-adaptive sealing, automatically closing to prevent air leakage when no instruments are available, and tightly adhering to the tube wall to maintain pneumoperitoneum stability when the puncture core or double J tube passes through; the structure is simple, reliable, and responds quickly.

[0019] Furthermore, the outer diameter of the puncture core is 1.6-2.35 mm, and a handle is provided at the end of the puncture core away from the blunt conical shape.

[0020] Beneficial effects: The outer diameter of the puncture core matches the inner diameter of the guide body, ensuring smooth passage of the puncture core and maintaining channel coaxiality, avoiding deviation or jamming during double-J tube insertion; the handle design provides a stable grip and precise axial thrust, making it easy for the operator to control the puncture depth and direction, improving catheter placement efficiency and reducing the probability of accidental puncture.

[0021] Furthermore, it also includes an opening and closing mechanism for guiding the double J tube through the center. The opening and closing mechanism is located on the side of the guide body near the blunt opening. The outer wall of the puncture core is provided with a linkage mechanism. When the puncture core is inserted into the guide body, the opening and closing mechanism is in a closed state. When the puncture core is pulled out, the opening and closing mechanism opens into a trumpet shape.

[0022] Beneficial effects: When the puncture core is removed, the opening and closing mechanism automatically opens into a funnel shape, providing a smooth insertion path for the double-J stent. This design prevents the stent tip from snagging, getting stuck, or shifting during insertion, reducing the risk of ureteral mucosal damage and improving the smoothness and success rate of the surgical procedure.

[0023] Furthermore, the opening and closing mechanism includes several spreading pieces circumferentially hinged to the side wall of the guide body, and a sliding ring slidably fitted inside the side wall of the guide body. Several connecting rods are circumferentially hinged to the bottom of the sliding ring, and the ends of the connecting rods away from the sliding ring are all hinged to the middle of the spreading pieces. A spring is also fixedly connected to the top of the sliding ring, and a limit block is fixedly connected to the top of the spring. The limit block is fixedly connected to the side wall of the guide body.

[0024] Beneficial effects: The sliding ring is driven by spring preload, and the opening and closing of the flap is achieved automatically through linkage with the connecting rod. During puncture, it closes to maintain airtightness, and during catheter placement, it expands to form a smooth funnel channel, which reduces the sharp edge of the inlet and frictional resistance, prevents the double-J tube from getting stuck or snagging, and ensures centered insertion, reducing the risk of mucosal damage and improving the safety and success rate of the operation.

[0025] Furthermore, the linkage mechanism includes a magnetic block detachably connected to the outer wall of the puncture core, an adsorption block slidingly fitted to the inner wall of the guide body, and the adsorption block and the magnetic block magnetically engaged; a pull wire is fixedly connected to the adsorption block, and the end of the pull wire away from the adsorption block is fixedly connected to the sliding ring; a rotating wheel is also rotatably fitted inside the side wall of the guide body, and the pull wire is tensioned on the outer wall of the rotating wheel.

[0026] Beneficial effects: The magnetic linkage mechanism utilizes magnetic force to transmit power non-contactly, achieving synchronous control of the piercing core and the sliding ring. The pull wire is guided by a rotating wheel, ensuring smooth and flexible opening and closing movements. The detachable design facilitates maintenance, and the overall structure is compact and reliable, improving the operational safety of double-J tube insertion.

[0027] Furthermore, the guide body is also equipped with a pressure ring, and the sealing cap contacts the top of the pressure ring; a fixing block is also fixedly connected to the inner wall of the guide body, and the pressure ring is located above the fixing block; when the sealing cap is tightened, the sealing cap compresses the pressure ring.

[0028] Beneficial effects: When the sealing cap is tightened, the compression ring is limited by the fixing block, causing it to undergo elastic deformation and fit tightly against the sealing cap and the cavity wall, enhancing airtightness and preventing air leakage; at the same time, it provides stable support to ensure coaxiality and structural stability when the puncture core is inserted.

[0029] Furthermore, an elastic layer is embedded at the bottom of the guide body; a groove is also provided on the outer wall of the puncture core, and the magnetic block slides in conjunction with the groove.

[0030] Beneficial effects: An elastic layer is set at the bottom of the guide body, which, together with the sliding groove on the outer wall of the puncture core and the magnetic block sliding structure, can achieve buffering and shock absorption and axial guidance during the insertion and withdrawal of the puncture core. The sliding groove provides guidance for the magnetic block, enabling the puncture core to have displacement capability, adjusting the extension length, and guiding the puncture core, thereby improving the operating feel and safety. Attached Figure Description

[0031] Figure 1This is an isometric view of the double-J stent placement guide for laparoscopic surgery according to the present invention.

[0032] Figure 2 For the present invention Figure 1 Enlarged view of section A.

[0033] Figure 3 This is an assembly cross-sectional view of the double-J stent placement guide for laparoscopic surgery according to the present invention.

[0034] Figure 4 For the present invention Figure 3 Enlarged view of section B.

[0035] Figure 5 For the present invention Figure 3 Enlarged view of section C.

[0036] Figure 6 For the present invention Figure 3 Front view of the central linkage mechanism.

[0037] Figure 7 For the present invention Figure 4 Enlarged view of section D.

[0038] The reference numerals in the accompanying drawings of the instruction manual include: 1. Guide body; 2. Puncture core; 3. Sealing cap; 4. Sealing gasket; 5. Handle; 6. Spreading plate; 7. Sliding ring; 8. Connecting rod; 9. Spring; 10. Limiting block; 11. Adsorption block; 12. Pull wire; 13. Rotating wheel; 14. Pressure ring; 15. Elastic layer. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] The following detailed description illustrates the specific implementation method:

[0043] Example 1:

[0044] As attached Figure 1 and Figure 2 The image shows a double-J stent placement guide for laparoscopic surgery, comprising a guide body 1, a puncture core 2, and a sealing cap 3. One end of the guide body 1 has a blunt opening, and the other end is threaded into the sealing cap 3. The puncture core 2 slides within the inner wall of the guide body 1, and the end of the puncture core 2 near the blunt opening is a blunt conical shape, which reduces cutting damage to abdominal wall tissue during puncture. A sealing gasket 4 is embedded inside the sealing cap 3, and the sealing gasket 4 has a cross-shaped slit in its center. When the puncture core 2 is withdrawn, a channel for the double-J stent to pass through is formed within the guide body 1. In this embodiment, the sealing cap 3 is made of rigid plastic (such as polycarbonate) and has internal threads on its inner wall.

[0045] The guide body 1 is made of a semi-soft medical material, which is medical polyurethane or medical silicone; in this embodiment, medical polyurethane is selected; the semi-soft medical material can be bent in the abdominal cavity with the assistance of instruments to adjust the direction of the tip so that the tip is aligned with the ureteral incision.

[0046] The guide body 1 has an inner diameter of 1.6-2.35mm, an outer diameter of 2.0-3.0mm, and a length of 10-15cm. The 1.6-2.35mm inner diameter covers double-J tubes of sizes 4.7F-7F, accommodating different needs of children and adults. Specifically, the 6F double-J tube corresponds to an inner diameter of 2.0mm, an outer diameter of 2.5mm, and a length of 15cm; the 7F double-J tube corresponds to an inner diameter of 2.35mm, an outer diameter of 3.0mm, and a length of 15cm. In this embodiment, the guide body 1 is a slender tubular shape with an external thread at the top that mates with the internal thread. The dimensions of the guide body 1 match the 4.7F double-J tube, with an inner diameter of 1.6mm, an outer diameter of 2.0mm, and a length of 15cm.

[0047] The sealing gasket 4 is a thin sheet of silicone or rubber. The cross-shaped slit is closed when no instrument passes through. When the puncture core 2 or double-J tube passes through, it elastically deforms and adheres tightly to the tube wall, forming an airtight seal. In this embodiment, the sealing gasket 4 is a thin rubber sheet, allowing the guidewire / double-J tube to pass through while preventing gas leakage. The cross-shaped slit of the sealing gasket 4 can accommodate guidewires / double-J tubes of different diameters, offering strong versatility. The structure is simple and reliable, requiring no additional valves, and is low-cost and easy to sterilize and replace.

[0048] The outer diameter of the puncture core 2 is 1.6-2.35 mm, and a handle 5 is provided at the end of the puncture core 2 away from the blunt conical shape. In this embodiment, the outer diameter of the puncture core 2 matches the inner diameter of the guide body 1, and its outer diameter is 1.6 mm to ensure smooth passage. The puncture core 2 is made of metal or high-strength plastic thin rod with a blunt conical tip, and the handle 5 is easy to operate; after it is inserted into the guide cavity, it enables the guide to puncture the abdominal wall.

[0049] The specific implementation process is as follows: First, before the operation, a guide device (guide body 1 inner diameter 1.6mm, outer diameter 2.0mm, length 15cm) matching the 4.7F double J tube is selected. Check whether the cross-shaped gap of the rubber sealing gasket 4 inside the sealing cap 3 is intact. Insert the puncture core 2 (outer diameter 1.6mm) from the rear end of the guide body 1, so that its blunt conical tip protrudes about 2mm from the front opening of the cavity, forming a complete puncture assembly; the sealing cap 3 is screwed onto the rear end of the cavity.

[0050] Under laparoscopic guidance, a suitable puncture point is selected on the affected side of the abdominal wall (usually located below the costal margin on the same side as the ureteroscopic incision). The puncture assembly is inserted perpendicularly into the abdominal wall, and the abdominal wall muscles and fascia are bluntly dissected using the tip of the puncture core 2, resulting in minimal resistance and bleeding. After entering the abdominal cavity, the laparoscope confirms the tip position is safe, and the handle 5 of the puncture core 2 is grasped and completely withdrawn. At this point, the guide body 1 remains inside the abdominal wall, with the front end in the abdominal cavity and the rear end protruding outside the body. The central cross-shaped slit of the rubber sealing gasket 4 inside the sealing cap 3 is closed when no instruments pass through, effectively sealing the abdominal cavity, preventing CO2 leakage, and maintaining stable pneumoperitoneum pressure.

[0051] The tip of the pre-placed guidewire-guided double-J tube (4.7F) is inserted through the cross-shaped slit of the sealing pad 4 and then into the guide body 1. Continue pushing until the tip of the double-J tube extends from the blunt opening at the front of the guide body 1 into the abdominal cavity. At this point, the lower part of the guide body 1 is grasped with laparoscopic forceps (due to its medical-grade semi-soft polyurethane material, it can be easily bent), and the direction of the tip of the guide body 1 is adjusted according to the position of the ureteral incision, ensuring the tip of the double-J tube is accurately aligned with the incision.

[0052] Under direct laparoscopic visualization, the tip of the double-J stent is inserted into the ureteral incision and pushed further into the renal pelvis to the predetermined depth (which can be determined by the markings on the double-J stent or the position of the guidewire). If guidewire guidance is required, the guidewire can be pushed into the ureter and renal pelvis first, then the double-J stent can be pushed into place along the guidewire, and finally the guidewire can be withdrawn.

[0053] After confirming that the double-J catheter is properly positioned and free from twisting or bending, slowly pull the guide body 1 out of the abdominal wall. Simultaneously, apply gauze to the puncture site to prevent gas leakage. Cover the puncture site with a dressing. Check the integrity of all guide components; the sealing gasket 4 and the cross-shaped slit must be intact and can be disinfected and reused (or discarded according to single-use regulations). Record the success rate of insertion and the insertion time.

[0054] Example 2:

[0055] As attached Figures 3-6 As shown, the difference from Embodiment 1 is that this embodiment also includes an opening and closing mechanism for guiding the double J tube through the center. The opening and closing mechanism is located on the side of the guide body 1 near the blunt opening. The outer wall of the puncture core 2 is provided with a linkage mechanism. When the puncture core 2 is inserted into the guide body 1, the opening and closing mechanism is in a closed state. When the puncture core 2 is pulled out, the opening and closing mechanism opens into a trumpet shape.

[0056] Combination Figure 4 and Figure 7 As shown, the opening and closing mechanism includes several spreading pieces 6 circumferentially hinged to the side wall of the guide body 1. A sliding ring 7 is also slidably fitted inside the side wall of the guide body 1. Several connecting rods 8 are circumferentially hinged to the bottom of the sliding ring 7. The ends of the connecting rods 8 away from the sliding ring 7 are all hinged to the middle of the spreading pieces 6. A spring 9 is also fixedly bonded to the top of the sliding ring 7. A limit block 10 is fixedly bonded to the top of the spring 9. The limit block 10 is embedded and fixed inside the side wall of the guide body 1.

[0057] The linkage mechanism includes a magnetic block detachably connected to the outer wall of the puncture core 2, and an adsorption block 11 slidingly fitted on the inner wall of the guide body 1, with the adsorption block 11 magnetically engaged with the magnetic block; a pull wire 12 is fixedly sleeved on the adsorption block 11 (e.g., Figure 6 As shown), the end of the pull wire 12 away from the adsorption block 11 is fixedly connected to the sliding ring 7; a rotating wheel 13 is also rotatably fitted inside the side wall of the guide body 1, and the pull wire 12 is tensioned on the outer wall of the rotating wheel 13.

[0058] The specific implementation process is as follows: Initially, spring 9 is at its natural length, sliding ring 7 is in the upper position, and the spreading plate 6 is in an open state (trumpet-shaped) under the push of connecting rod 8. However, in order to puncture, the spreading plate 6 needs to be retracted. At this time, the puncture core 2 is inserted from the rear end of the guide body 1, and the magnetic block on the outer wall of the puncture core 2 moves forward with it.

[0059] When the magnetic block approaches the adsorption block 11 on the inner wall of the guide body 1, the magnetic attraction causes the adsorption block 11 to be attracted to the magnetic block and slide forward together with the puncture core 2. As the adsorption block 11 moves forward, it drives the pull wire 12 fixed to it to move forward as well. After the pull wire 12 passes around the rotating wheel 13 inside the side wall of the guide body 1, its other end is connected to the sliding ring 7. The adsorption block 11 pulls the pull wire 12 forward, and the pull wire 12 on the other side of the rotating wheel 13 pulls the sliding ring 7 backward. The sliding ring 7 is pulled backward (towards the rear end of the guide body 1), moving against the elastic force of the spring 9. The sliding ring 7 pulls the middle of the expansion piece 6 through the connecting rod 8 at the bottom hinge, causing the expansion piece 6 to retract inward around its circumferential hinge point, so that it is close to the outer wall of the guide body 1, keeping the entire front end diameter to a minimum for easy puncture. After the puncture core 2 is fully inserted, the magnetic block and the adsorption block 11 remain attracted to each other, the spring 9 is in a compressed and stored energy state, and the expansion piece 6 remains retracted. Because the compression of spring 9 has a limit, when the limit is reached, spring 9 remains in a holding state while the puncture core 2 continues to move.

[0060] Under laparoscopic monitoring, the retracted puncture assembly is vertically inserted into the abdominal wall. Because the retractor 6 is retracted and its frontal outer diameter matches that of the guide body 1, puncture resistance is low; the blunt conical tip of the puncture core 2 bluntly separates tissue, reducing cutting damage. After entering the abdominal cavity, the position is confirmed to be safe.

[0061] Hold the handle 5 of the puncture core 2 and slowly pull it outward. When the magnetic block moves backward with the puncture core 2 and separates from the suction block 11, the magnetic attraction disappears. The suction block 11 is no longer pulled forward, and the compressed spring 9 releases its energy, pushing the sliding ring 7 forward (towards the front end of the guide body 1) to reset. As the sliding ring 7 moves forward, it pushes the middle of the spreading plate 6 through the connecting rod 8, causing the spreading plate 6 to open around the hinge point in a direction away from the puncture core 2, forming a radial trumpet-shaped structure with a diameter of approximately 4mm after opening. The opening process is smooth and synchronous, and all spreading plates 6 are automatically completed under the drive of the spring 9, without the need for additional operation by the operator. The pull wire 12 is pulled back when the sliding ring 7 moves forward, causing the suction block 11 to slide backward to reset.

[0062] Subsequently, the double-J catheter, guided by the guidewire, is inserted into the guide body 1 through the cross-shaped slit of the sealing cap 3. After extending from the front end of the cavity, the double-J catheter enters the already opened funnel-shaped area. Because the spreading plate 6 is conical and radially shaped, its inner wall naturally forms a guide slope, facilitating the release of the double-J catheter. The spreading plate 6 serves as a guiding transition, gently pushing aside surrounding intestinal loops, fat, or adhesions to create a temporary open area approximately 4-5 mm in diameter in front of the ureteral incision. The surgeon simply needs to place the funnel-shaped opening close to the ureteral incision and continue pushing the double-J catheter in for accurate insertion. This avoids interference from surrounding tissues during catheter placement, reducing the risk of accidental clamping or injury, and is suitable for the small and crowded environment of a child's abdominal cavity.

[0063] After the double-J stent is in place, the guide body 1 is slowly withdrawn. During withdrawal, if adjustment or re-puncture is required, the puncture core 2 can be reinserted, the magnetic block re-attracts the adsorption block 11, and the linkage mechanism drives the spreading plate 6 to retract and reset, restoring the initial puncture configuration and reducing traction on the tissue; retraction also facilitates the withdrawal of the guide body 1. Finally, press the puncture point to complete the operation. In this embodiment, the maximum outer diameter of the opened funnel mouth is larger than the outer diameter of the guide cavity. When the surgeon delivers the tip of the guide to the target position, the funnel mouth forms a barbed structure near the ureteral incision. If the guide tends to slip outward, the edge of the funnel mouth will be caught on the inner side of the abdominal wall or surrounding tissue, providing a reverse anchoring effect.

[0064] Existing double-J catheter insertion devices either have a fixed bend in the front guide structure, which cannot change shape according to different stages of puncture and catheter placement, or a manually controlled clamp structure, requiring the surgeon to use another instrument or hand to operate the opening and closing, increasing surgical steps and inconvenience. This invention, however, uses magnetic coupling and a spring 9 energy storage mechanism, using the insertion and removal of the puncture core 2 as trigger sources to achieve automatic closing and opening of the spreading plate 6. The surgeon does not need to close the guide head separately before puncture, nor does he / she need to manually open the guide head before catheter placement; the conversion process is completed autonomously by the structure, without occupying additional surgical time.

[0065] Example 3:

[0066] As attached Figure 5 As shown, the difference from Embodiment 2 is that the guide body 1 is also provided with a pressure ring 14. The pressure ring 14 is made of an elastic material (such as medical silicone or medical rubber). The sealing cap 3 is in contact with the top of the pressure ring 14. A fixing block is also fixedly bonded to the inner wall of the guide body 1, and the pressure ring 14 is located above the fixing block. When the sealing cap 3 is tightened, the sealing cap 3 compresses the pressure ring 14.

[0067] The specific implementation process is as follows: The sealing cap 3 is screwed into the top thread of the guide body 1; as the sealing cap 3 is gradually tightened, its inner end face continuously presses downwards against the top of the pressure ring 14. Since the pressure ring 14 is blocked below by the fixing block, the tightening force is converted into axial compressive stress on the pressure ring 14, causing it to undergo elastic deformation and expand radially. After being compressed, the outer wall of the pressure ring 14 tightly adheres to the inner wall of the guide body 1, while the inner wall can tightly adhere to the sealing gasket 4 or the outer surface of the puncture core 2 / double J tube (depending on the current insertion). This radial compression effect also improves the airtightness between the sealing cap 3 and the guide body 1, as well as between the sealing gasket 4 and the insertion instrument, effectively preventing CO2 gas in the abdominal cavity from leaking through the interface gaps.

[0068] In this embodiment, the pressure ring 14 also serves as an elastic intermediate medium, absorbing the localized concentrated load when the sealing cap 3 is tightened, thus preventing the rigid plastic sealing cap 3 from directly compressing the semi-soft medical polyurethane cavity. When the puncture core 2 or double-J tube needs to be replaced during the procedure, simply loosen and then retighten the sealing cap 3, and the pressure ring 14 will return to its compressed state and re-establish a reliable seal.

[0069] Example 4:

[0070] As attached Figure 4 As shown, the difference from Embodiment 3 is that an elastic layer 15 is also embedded in the bottom of the guide body 1. The elastic layer 15 is made of medical silicone or polyurethane foam; a groove is also provided on the outer wall of the puncture core 2, and the magnetic block slides in the groove.

[0071] The specific implementation process is as follows: During the instrument preparation stage, the operator can adjust the relative position of the magnetic block and the adsorption block 11 through the slide groove according to the needs, thereby controlling the length of the puncture core 2 extending from the front end of the guide body 1 to accommodate patients of different body types. After the tip of the puncture core 2 reaches the front end of the guide body 1, its root gradually approaches the elastic layer 15 at the bottom of the guide body 1. Due to the flexibility of the elastic layer 15, the end of the puncture core 2 first contacts the elastic layer 15 and is slightly compressed to absorb the impact force during the pushing process. At the same time, the rebound force of the elastic layer 15 will naturally push the puncture core 2 to the center position of the guide body 1, playing an auxiliary central guiding role, keeping the puncture core 2 in the center of the cavity, reducing frictional resistance, and improving puncture accuracy.

[0072] The insertion of the double-J catheter also benefits from the elastic layer 15. When the double-J catheter is inserted into the guide body 1 and pushed to the bottom, the slight indentation or pre-drilled hole (if a guide groove is designed) in the center of the elastic layer 15 guides the double-J catheter to slide naturally towards the front end of the lumen, preventing it from deviating to one side during insertion and ensuring it extends from the center of the blunt opening, thus accurately aligning with the ureteral incision. Throughout the procedure, the groove ensures the reliability of the axial adjustment and magnetic linkage of the puncture core 2, while the elastic layer 15 provides additional benefits such as end-point cushioning and automatic centering.

[0073] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A laparoscopic double-J stent placement guide, comprising a guide body (1), a puncture core (2), and a sealing cap (3), characterized in that, One end of the guide body (1) has a blunt opening, and the other end of the guide body (1) is threaded into the sealing cap (3); the puncture core (2) slides into the inner wall of the guide body (1), and the end of the puncture core (2) near the blunt opening is a blunt cone shape; a sealing gasket (4) is embedded inside the sealing cap (3), and a cross-shaped slit is opened in the center of the sealing gasket (4); when the puncture core (2) is pulled out from the guide body (1), a channel for the double J tube to pass through is formed inside the guide body (1).

2. The laparoscopic double-J stent placement guide according to claim 1, characterized in that, The guide body (1) is made of semi-soft medical material, which is medical polyurethane or medical silicone.

3. The laparoscopic double-J stent placement guide according to claim 2, characterized in that, The inner diameter of the guide body (1) is 1.6-2.35mm, the outer diameter is 2.0-3.0mm, and the length is 10-15cm.

4. The laparoscopic double-J stent placement guide according to claim 3, characterized in that, The sealing gasket (4) is a silicone or rubber sheet. The cross-shaped slit is closed when no instrument passes through. When the puncture core (2) or double J tube passes through, it deforms elastically and adheres tightly to the tube wall to form an airtight seal.

5. The laparoscopic double-J stent placement guide according to claim 4, characterized in that, The outer diameter of the puncture core (2) is 1.6-2.35 mm, and the end of the puncture core (2) away from the blunt conical shape is also provided with a handle (5).

6. The laparoscopic double-J stent placement guide according to claim 5, characterized in that, It also includes an opening and closing mechanism for guiding the double J tube through the center. The opening and closing mechanism is located on the side of the guide body (1) near the blunt opening. The outer wall of the puncture core (2) is provided with a linkage mechanism. When the puncture core (2) is inserted into the guide body (1), the opening and closing mechanism is in a closed state. When the puncture core (2) is pulled out, the opening and closing mechanism opens into a trumpet shape.

7. The laparoscopic double-J stent placement guide according to claim 6, characterized in that, The opening and closing mechanism includes several spreading pieces (6) that are circumferentially hinged to the side wall of the guide body (1). A sliding ring (7) is also slidably fitted inside the side wall of the guide body (1). Several connecting rods (8) are circumferentially hinged to the bottom of the sliding ring (7). The end of the connecting rod (8) away from the sliding ring (7) is hinged to the middle of the spreading piece (6). A spring (9) is also fixedly connected to the top of the sliding ring (7). A limit block (10) is fixedly connected to the top of the spring (9). The limit block (10) is fixedly connected to the side wall of the guide body (1).

8. The laparoscopic double-J stent placement guide according to claim 7, characterized in that, The linkage mechanism includes a magnetic block that is detachably connected to the outer wall of the puncture core (2), an adsorption block (11) that slides on the inner wall of the guide body (1), and the adsorption block (11) and the magnetic block are magnetically engaged; a pull wire (12) is fixedly connected to the adsorption block (11), and one end of the pull wire (12) away from the adsorption block (11) is fixedly connected to the sliding ring (7); a rotating wheel (13) is also rotatably engaged inside the side wall of the guide body (1), and the pull wire (12) is tensioned on the outer wall of the rotating wheel (13).

9. The laparoscopic double-J stent placement guide according to claim 8, characterized in that, The guide body (1) is also provided with a pressure ring (14), and the sealing cap (3) is in contact with the top of the pressure ring (14); a fixing block is also fixedly connected to the inner wall of the guide body (1), and the pressure ring (14) is located above the fixing block; when the sealing cap (3) is tightened, the sealing cap (3) compresses the pressure ring (14).

10. The laparoscopic double-J stent placement guide according to claim 9, characterized in that, The bottom of the guide body (1) is also embedded with an elastic layer (15); the outer wall of the puncture core (2) is also provided with a sliding groove, and the magnetic block slides in cooperation with the sliding groove.

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