A peelable sheath and a lithotripsy sheath kit for percutaneous nephroscopy

Abstract

The application relates to a tearable stripping sheath and a lithotripsy sheath kit for a percutaneous nephroscope, a cross section of a skin sheath tube is designed as a hollow ellipse, a short axis direction of an elliptical section is consistent with a partition plate, extrusion damage to kidney parenchyma during puncture expansion is reduced, and a long axis direction guarantees a larger operation space for the nephroscope and negative pressure suction; a chamber partition plate is arranged along the short axis direction of the skin sheath tube, and the skin sheath tube is divided into independent first and second chambers, and is connected with a lithotripsy mirror through hole and a negative pressure suction channel pipe respectively, the nephroscope and the negative pressure suction channel are completely isolated, interference between instrument operation and lithotripsy suction is avoided, nephroscope field of view definition and instrument steering flexibility are improved, the second chamber is specially used for negative pressure suction, and an independent chamber structure reduces the risk of channel blockage caused by blood clots or large-particle lithotripsy accumulation; detachable connection design of the partition plate and a sealing plug is convenient for selective use of chamber separation function or switching to a single chamber mode (such as expanding the operation space in special cases).

Description

Technical Field

[0001] This application relates to the field of medical devices, specifically to a tearable peelable sheath and a stone-clearing sheath kit for percutaneous nephroscopy. Background Technology

[0002] Percutaneous nephrolithotomy (PCNL) is a minimally invasive surgical procedure that uses a percutaneous renal access to break up and remove stones within the kidney. It is primarily used to treat complex or large kidney stones and upper ureteral stones. A 1cm incision is made in the lower back, and under ultrasound or X-ray guidance, a puncture is made into the renal collecting system. The incision is gradually expanded to form a percutaneous renal access with a diameter of 16-24 Fr. A nephroscope is inserted through the access, and under direct vision, the stones are broken up using holmium laser, ultrasound, or pneumatic ballistic devices. The stones are then removed by repeatedly withdrawing the nephroscope using water pressure.

[0003] In related technologies, the scope can swing freely under a circular single-lumen sheath, the space around the scope for stone removal is small, and the efficiency of negative pressure suction for stone removal is low, making it difficult to achieve high-efficiency continuous lithotripsy and stone removal techniques in clinical surgery. Summary of the Invention

[0004] This application provides a tearable peelable sheath and a stone-clearing sheath kit for percutaneous nephroscopy, which can solve the technical problems of the traditional circular single-lumen sheath, the free swing of the endoscope body, the small space around the endoscope body for stone removal, and the low efficiency of negative pressure suction for stone removal.

[0005] In a first aspect, embodiments of this application provide a tearable peelable sheath, comprising:

[0006] A leather sheath tube, wherein the cross-section of the leather sheath tube is elliptical;

[0007] The sheath connector has a cross-section at one end that matches the cross-section of the leather sheath and is inserted into the leather sheath. A sealing plug is installed on the other end face of the sheath connector, and a clear stone mirror through hole is opened on one end face of the sealing plug. A negative pressure suction channel tube is connected to the side wall of the sheath connector.

[0008] A chamber partition is provided, one end of which is detachably connected to one end face of the sealing plug. The chamber partition is located inside the sheath tube, and its length direction is consistent with the length direction of the sheath tube. The chamber partition coincides with the short diameter of the sheath tube, dividing the interior of the sheath tube into a first chamber and a second chamber. The first chamber is connected to the through hole of the cleaning mirror, and the second chamber is connected to the negative pressure suction channel tube.

[0009] In conjunction with the first aspect, in one embodiment, a partition groove is formed on one end face of the sealing plug;

[0010] The thickness of the chamber partition gradually increases at one end near the sealing plug and is inserted into the first groove of the partition.

[0011] In conjunction with the first aspect, in one embodiment, one end face of the sealing plug is provided with a partition groove and an installation groove, and one end of the installation groove is connected to the partition groove.

[0012] The tearable peelable sheath also includes an elastic telescopic locking element, which is disposed within the mounting groove;

[0013] One end of the chamber partition has an insertion hole, and one end of the chamber partition is inserted into the second groove of the partition. The elastic force of the elastic telescopic locking member tends to push its telescopic end into the insertion hole.

[0014] In conjunction with the first aspect, in one embodiment, the elastic telescopic locking member and the insertion hole constitute a set of telescopic locking components, and the number of the telescopic locking components is two sets, which are located on the same inner side wall or opposite inner side walls of the partition groove two.

[0015] In conjunction with the first aspect, in one embodiment, the resilient telescopic locking member includes:

[0016] A guide rod, one end of which is fixed to the inner wall of the mounting groove;

[0017] A telescopic rod is slidably sleeved on the outer wall of the guide rod, and a telescopic spring is connected between the telescopic rod and the guide rod. The elastic force of the telescopic spring tends to push the telescopic rod into the second groove of the partition plate.

[0018] In conjunction with the first aspect, in one embodiment, the resilient telescopic locking member further includes:

[0019] A lever, which is fixed to the side wall of the telescopic rod.

[0020] In conjunction with the first aspect, in one embodiment, the chamber partition includes a first plate and a second plate, the first plate and the second plate being at least partially attached together, and the remaining portions being arranged in a herringbone shape away from each other, and both the first plate and the second plate being made of elastic materials;

[0021] Two partition grooves are provided on one end face of the sheath connector, and the ends of the first plate and the second plate that are far apart from each other are respectively inserted into the corresponding partition grooves.

[0022] In conjunction with the first aspect, in one embodiment, the ends of the first plate and the second plate that are far apart from each other are both rounded.

[0023] In conjunction with the first aspect, in one embodiment, the long diameter of the sheath tube ranges from 19 to 21 Fr, and its short diameter ranges from 17 to 19 Fr.

[0024] Secondly, embodiments of this application provide a stone-clearing sheath kit for percutaneous nephroscopy, which includes a tearable peelable sheath as described in some of the above embodiments.

[0025] The beneficial effects of the technical solutions provided in this application include:

[0026] The sheath tube is designed with a hollow elliptical cross-section, maximizing the stone-clearing channel cross-section for a given sheath size. The short axis of the elliptical cross-section aligns with the septum, reducing compression damage to the renal parenchyma during puncture and dilation, while the long axis provides ample operating space for the nephroscope and negative pressure suction. A chamber septum is positioned along the short axis of the sheath tube, dividing its interior into independent first and second chambers, respectively connected to the lithoscopic aperture and the negative pressure suction channel. The nephroscope and the negative pressure suction channel are completely isolated, preventing interference between instrument operation and stone fragment adsorption, improving the clarity of the nephroscope's field of vision and the flexibility of instrument turning. The second chamber is dedicated to negative pressure suction, and its independent chamber structure reduces the risk of channel blockage caused by blood clots or large stone fragments. The detachable connection between the septum and the sealing plug allows for selective use of the chamber function or switching to single-chamber mode during the procedure (if additional operating space is needed in special circumstances). A lithoscopic aperture is located on one end of the sealing plug, through which the nephroscope directly enters the first chamber. The negative pressure suction system connects to the second chamber via the negative pressure suction channel, maintaining stable adsorption pressure. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A three-dimensional view of a tearable, peelable sheath;

[0029] Figure 2 A schematic diagram of the inner structure of one embodiment of the sealing plug;

[0030] Figure 3 A side view of one embodiment of a chamber partition;

[0031] Figure 4 A schematic diagram of the inner structure of another embodiment of the sealing plug;

[0032] Figure 5 for Figure 4A partially enlarged structural diagram of the central sealing plug;

[0033] Figure 6 A side view of another embodiment of the chamber partition;

[0034] Figure 7 A schematic diagram of the inner structure of another embodiment of the sealing plug;

[0035] Figure 8 This is a side view of another embodiment of a chamber partition.

[0036] In the diagram: 1. Sheath tube; 11. First chamber; 12. Second chamber; 2. Sheath tube connector; 21. Sealing plug; 211. Clear mirror through hole; 212. Partition groove one; 213. Partition groove two; 214. Mounting groove; 215. Elastic telescopic locking element; 2151. Guide rod; 2152. Telescopic rod; 2153. Telescopic spring; 2154. Lever; 216. Partition groove three; 22. Negative pressure suction channel tube; 3. Chamber partition; 31. First plate; 32. Second plate; 33. Insertion hole. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0038] This application provides a tearable peelable sheath and a stone-clearing sheath kit for percutaneous nephroscopy, which can solve the technical problems of the traditional circular single-lumen sheath causing the scope to swing freely, the narrow space around the scope for stone removal, and the low efficiency of negative pressure suction for stone removal.

[0039] Firstly, such as Figure 1As shown, this application embodiment provides a tearable peelable sheath, which includes: a sheath tube 1, the cross-section of the sheath tube 1 being elliptical; a sheath tube connector 2, one end of the sheath tube connector 2 having a cross-section adapted to the cross-section of the sheath tube 1 and being inserted into the sheath tube 1, the other end of the sheath tube connector 2 having a sealing plug 21 installed thereon, and one end of the sealing plug 21 having a lithoscopic through hole 211, the side wall of the sheath tube connector 2 being connected to a negative pressure suction channel tube 22; a chamber partition 3, one end of the chamber partition 3 being detachably connected to one end of the sealing plug 21, and the chamber partition 3 being located inside the sheath tube 1, and its length direction being consistent with the length direction of the sheath tube 1, the chamber partition 3 coinciding with the short diameter of the sheath tube 1, dividing the interior of the sheath tube 1 into a first chamber 11 and a second chamber 12, the first chamber 11 being connected to the lithoscopic through hole 211, and the second chamber 12 being connected to the negative pressure suction channel tube 22.

[0040] In this embodiment, the sheath tube 1 is divided into a first chamber 11 (nephroscope channel) and a second chamber 12 (negative pressure suction channel) by a chamber partition 3, realizing the functional separation of nephroscopic operation and lithotripsy adsorption. The second chamber 12 is dedicated to negative pressure suction, avoiding blockage of the adsorption channel due to space competition when lithotripsy or blood clots share the chamber with the nephroscope. The nephroscope operates independently in the first chamber 11, avoiding liquid turbulence or bubble interference caused by negative pressure suction, improving the stability and clarity of the intraoperative field of view by 40% to 50%. The short axis (coinciding with the chamber partition) reduces the compression of the renal parenchyma, while the elliptical long axis ensures a large space for the nephroscope to move, supporting flexible nephroscopic turning and multi-angle lithotripsy operations. The semi-elliptical cavity of the second chamber 12 enhances the effectiveness of negative pressure suction. The efficiency is improved, and the speed of removing powdered stones is accelerated. The detachable connection design of the chamber partition 3 and the sealing plug 21 allows the surgeon to choose according to the actual situation. In the dual-chamber mode, the chamber structure is maintained under normal conditions, taking into account both operation and suction functions. In the single-chamber mode, the chambers are combined after the chamber partition 3 is removed, which is used to quickly remove large stones or deal with complex adhesions in emergency situations. After the chamber partition 3 is removed, the sheath tube 1 is restored to a complete elliptical channel, which is compatible with extra-large diameter stone forceps or balloon dilation instruments, expanding the indications for surgery. The nephroscope can be directly inserted into the first chamber 11 through the lithoscopic aperture 211 without the need for additional connecting instruments. The negative pressure suction system is seamlessly connected to the second chamber 12 through the negative pressure suction channel tube 22 on the side wall, avoiding frequent switching of equipment during the operation.

[0041] Furthermore, the sheath tube 1 is made of medical polymer (such as polyurethane) with a peelable outer layer that can be peeled off layer by layer as needed during the procedure, reducing traction damage to the puncture channel when the sheath is removed; the inner wall of the sheath tube 1 is coated with heparin or a hydrophilic coating to reduce blood cell adhesion and lower the postoperative thrombosis rate.

[0042] In conjunction with the first aspect, in one implementation, such as Figure 2 and Figure 3As shown, a partition groove 212 is provided on one end face of the sealing plug 21; the thickness of the chamber partition 3 gradually increases at the end near the sealing plug 21 and is inserted into the partition groove 212.

[0043] In this embodiment, the thickness of the chamber partition 3 gradually increases at the end near the sealing plug 21, making it more durable and reliable than the traditional chamber partition 3 with a single thickness, and less prone to breakage that could lead to surgical risks.

[0044] In conjunction with the first aspect, in one implementation, such as Figure 3 , Figure 4 and Figure 5 As shown, one end face of the sealing plug 21 is provided with a partition groove 213 and a mounting groove 214, and one end of the mounting groove 214 is connected to the partition groove 213; the tearable peelable sheath also includes an elastic telescopic locking member 215, which is disposed in the mounting groove 214; one end side wall of the chamber partition 3 is provided with an insertion hole 33, and one end of the chamber partition 3 is inserted into the partition groove 213, and the elastic force of the elastic telescopic locking member 215 tends to push its telescopic end into the insertion hole 33.

[0045] In this embodiment, the elastic telescopic locking member 215 pushes the telescopic end into the insertion hole 33 of the chamber partition 3 through elastic force, realizing the rapid locking of the chamber partition 3 and the sheath connector 2, avoiding the chamber partition 3 from falling off or shifting during the operation. This design supports one-handed operation for unlocking, making it easy for the surgeon to quickly switch between dual-lumen / single-lumen modes and improving operational flexibility. The communication design between the partition groove 213 and the mounting groove 214 ensures that the elastic telescopic locking member 215 extends and retracts along a fixed path in the mounting groove 214, avoiding locking failure due to offset. After the chamber partition 3 is inserted into the partition groove 213, its short axis direction coincides with the elliptical short diameter of the sheath tube 1, maintaining the symmetry of the chamber structure and reducing fluid resistance.

[0046] In conjunction with the first aspect, in one implementation, such as Figure 5 As shown, the elastic telescopic locking member 215 and the insertion hole 33 are a set of telescopic locking components. There are two sets of telescopic locking components, which are located on the same inner side wall or opposite inner side walls of the partition groove 213.

[0047] In this embodiment, two sets of telescopic locking components are located on opposite inner sidewalls of the partition groove 213. The telescopic ends of the two sets of elastic telescopic locking components 215 are symmetrically locked with the two insertion holes 33 of the chamber partition 3. The double-sided locking force counteracts the lateral displacement when the chamber partition 3 is inserted, ensuring that the chamber partition 3 and the short axis of the sheath tube 1 are strictly coincident, maintaining the symmetry of the chamber structure. The two sets of locking components form a "double-point fixation" to prevent the partition from loosening due to the rotation of the nephroscope or the vibration of negative pressure suction during the operation, thereby improving the stability of the chamber.

[0048] In conjunction with the first aspect, in one implementation, such as Figure 4 and Figure 5 As shown, the elastic telescopic locking component 215 includes: a guide rod 2151, one end of which is fixed to the inner wall of the mounting groove 214; and a telescopic rod 2152, which is slidably sleeved on the outer wall of the guide rod 2151, and a telescopic spring 2153 is connected between the telescopic rod 2152 and the guide rod 2151, the elastic force of which tends to push the telescopic rod 2152 into the partition groove 213.

[0049] In this embodiment, the guide rod 2151 is fixed to the inner wall of the mounting groove 214, providing an axial sliding track for the telescopic rod 2152, limiting the radial offset of the telescopic rod 2152, ensuring that the telescopic end is always aligned with the insertion hole 33 of the chamber partition 3, and improving the locking and positioning accuracy. The telescopic rod 2152 is slidably sleeved on the outer wall of the guide rod 2151, and is pushed to move towards the partition groove 213 by the elastic force of the telescopic spring 2153, so as to realize automatic insertion with the insertion hole 33.

[0050] Furthermore, the stiffness coefficient of the telescopic spring 2153 is designed to be 5-8 N / mm (based on the clinical operating force threshold), which provides sufficient locking force (>15 N) while allowing the operator to apply a 20-30 N unlocking force with one hand to compress the spring and remove it from the insertion hole.

[0051] Furthermore, the telescopic spring 2153 is made of 316L stainless steel with a titanium nitride coating, and has a compression cycle count >10. 5 This avoids the loss of elasticity due to repeated use.

[0052] Furthermore, the contact surfaces of the guide rod 2151 and the telescopic rod 2152 are coated with a polytetrafluoroethylene (PTFE) coating, reducing the coefficient of friction to below 0.05, thus preventing movement jamming caused by the infiltration of blood or tissue fluid.

[0053] Furthermore, a silicone sealing ring (not shown in the figure) is provided at the opening of the mounting groove 214 to prevent gravel particles from entering the gap between the guide rod 2151 and the telescopic rod 2152, thereby reducing the failure rate of the instrument.

[0054] Furthermore, the sleeve length ratio of the telescopic rod 2152 to the guide rod 2151 is 2:1 (e.g., the guide rod 2151 is 20mm long and the sleeve length of the telescopic rod 2152 is 40mm). Through the leverage effect, the axial thrust of the telescopic spring 2153 is amplified by 1.5 times to ensure that the locking depth of the insertion hole 33 is ≥3mm.

[0055] Furthermore, the guide rod 2151 is fixed to the mounting groove 214 by a threaded connection. The operator can remove the entire elastic telescopic locking component 215 by rotating it counterclockwise by 90°. It supports high temperature and high pressure sterilization.

[0056] Furthermore, the surface of the telescopic rod 2152 is treated with a medical-grade anodizing process, making it resistant to immersion in chlorine-containing disinfectant solutions (sodium hypochlorite concentration ≤5000ppm).

[0057] In conjunction with the first aspect, in one implementation, such as Figure 3 As shown, the elastic telescopic locking member 215 also includes a lever 2154, which is fixed to the side wall of the telescopic rod 2152.

[0058] In this embodiment, the lever 2154 is fixed to the side wall of the telescopic rod 2152 to form a lever fulcrum. When the operator presses the lever 2154, the operating force can be amplified by 2-3 times (depending on the lever arm length ratio), which significantly reduces the force required for unlocking and is suitable for operation scenarios where gloves are worn.

[0059] Furthermore, the end of the lever 2154 is provided with anti-slip texture (texture depth 0.5mm).

[0060] Furthermore, the surface of the lever 2154 is made of medical-grade PEEK material (flexural modulus 3.5 GPa), which can withstand high temperature and high pressure sterilization (135℃ / 2.1 bar) and chemical disinfectant immersion (pH 2-12).

[0061] In conjunction with the first aspect, in one implementation, such as Figure 5 As shown, the end of the telescopic rod 2152 near the partition groove 213 is rounded.

[0062] In this embodiment, the rounded corner (radius R = 0.5~1mm) design at the end of the telescopic rod 2152 reduces the insertion resistance, enabling the insertion hole 33 of the chamber partition 3 to be quickly aligned. The rounded corner design avoids wear on the edge of the insertion hole 33 due to misalignment.

[0063] In conjunction with the first aspect, in one implementation, such as Figure 7 and Figure 8 As shown, the chamber partition 3 includes a first plate 31 and a second plate 32. The first plate 31 and the second plate 32 are at least partially attached to each other, and the remaining parts are arranged in a V-shape away from each other. The materials of the first plate 31 and the second plate 32 are both elastic materials. A partition groove 316 is opened on one end face of the sheath connector 2. The ends of the first plate 31 and the second plate 32 that are away from each other are respectively inserted into the corresponding partition groove 316.

[0064] In this embodiment, by pressing the ends of the first plate 31 and the second plate 32 that are far apart from each other, the ends of the first plate 31 and the second plate 32 that are far apart from each other are brought closer together and inserted into the partition groove 3 216. With the first plate 31 and the second plate 32 being made of elastic materials, the ends of the first plate 31 and the second plate 32 that are far apart from each other are inserted into the partition groove 3 216 and their inner sidewalls are squeezed, thus completing the installation of the chamber partition 3. Conversely, by pressing the ends of the first plate 31 and the second plate 32 that are far apart from each other, the chamber partition 3 can be removed from the partition groove 3 216.

[0065] Furthermore, the first plate 31 and the second plate 32 are made of elastic material (such as medical silicone, Shore hardness 50A±5), and the herringbone opening angle is 60°~80°.

[0066] Furthermore, the area where the first plate 31 and the second plate 32 are attached accounts for 40% to 60% of the total area.

[0067] In conjunction with the first aspect, in one implementation, such as Figure 5 As shown, the ends of the first plate 31 and the second plate 32 that are far apart from each other are both rounded.

[0068] In this embodiment, the rounded corner design can effectively disperse the stress concentration at the end of the plate, avoid material fatigue or fracture caused by sharp edges, improve the durability and reliability of the structure, and make the end of the plate easier to insert into the partition groove 216, reducing frictional resistance during installation and improving operating efficiency.

[0069] In conjunction with the first aspect, in one embodiment, the long diameter of the sheath tube 1 ranges from 19 to 21 Fr, and its short diameter ranges from 17 to 19 Fr.

[0070] In this embodiment, the design of the long diameter (19-21 Fr) and short diameter (17-19 Fr) of the sheath tube 1 can adapt to the vascular anatomy of different patients and reduce the risk of leakage.

[0071] Secondly, embodiments of this application provide a stone-clearing sheath kit for percutaneous nephroscopy, which includes a tearable peelable sheath as mentioned in some of the above embodiments.

[0072] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0073] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0074] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A tearable peelable sheath, characterized in that, It includes: The sheath tube (1) has an elliptical cross-section; Sheath connector (2), one end of the sheath connector (2) is adapted to the cross-section of the leather sheath (1), and the end is inserted into the leather sheath (1). A sealing plug (21) is installed on the other end face of the sheath connector (2), and a clear mirror through hole (211) is opened on one end face of the sealing plug (21). A negative pressure suction channel tube (22) is connected to the side wall of the sheath connector (2). A chamber partition (3) is provided, one end of which is detachably connected to one end face of the sealing plug (21). The chamber partition (3) is located inside the sheath tube (1), and its length direction is consistent with the length direction of the sheath tube (1). The short diameter of the chamber partition (3) coincides with that of the sheath tube (1), dividing the interior of the sheath tube (1) into a first chamber (11) and a second chamber (12). The first chamber (11) is connected to the clear mirror through hole (211), and the second chamber (12) is connected to the negative pressure suction channel tube (22).

2. The tearable peelable sheath as described in claim 1, characterized in that, One end face of the sealing plug (21) is provided with a partition groove (212); The thickness of the chamber partition (3) gradually increases at one end near the sealing plug (21) and is inserted into the partition groove (212).

3. The tearable peelable sheath as described in claim 1, characterized in that, The sealing plug (21) has a partition groove (213) and a mounting groove (214) on one end face, and one end of the mounting groove (214) is connected to the partition groove (213); The tearable peeling sheath also includes an elastic telescopic locking element (215), which is disposed in the mounting groove (214); The chamber partition (3) has an insertion hole (33) on one side wall. One end of the chamber partition (3) is inserted into the partition groove (213). The elastic force of the elastic telescopic locking member (215) tends to push its telescopic end into the insertion hole (33).

4. The tearable peelable sheath as described in claim 3, characterized in that, The elastic telescopic locking member (215) and the insertion hole (33) are a set of telescopic locking components. There are two sets of telescopic locking components, which are located on the same inner side wall or opposite inner side walls of the partition groove (213).

5. The tearable peelable sheath as described in claim 3, characterized in that, The elastic telescopic locking member (215) includes: Guide rod (2151), one end of which is fixed to the inner wall of the mounting groove (214); A telescopic rod (2152) is slidably sleeved on the outer wall of the guide rod (2151), and a telescopic spring (2153) is connected between the telescopic rod (2152) and the guide rod (2151). The elastic force of the telescopic spring (2153) tends to push the telescopic rod (2152) into the second groove (213) of the partition plate.

6. The tearable peelable sheath as described in claim 5, characterized in that, The elastic telescopic locking member (215) also includes: A lever (2154) is fixed to the side wall of the telescopic rod (2152).

7. The tearable peelable sheath as described in claim 1, characterized in that, The chamber partition (3) includes a first plate (31) and a second plate (32). The first plate (31) and the second plate (32) are at least partially attached to each other, and the remaining parts are arranged in a herringbone shape away from each other. The materials of the first plate (31) and the second plate (32) are both elastic materials. Two partition grooves (216) are provided on one end face of the sheath connector (2), and the ends of the first plate (31) and the second plate (32) that are far apart from each other are respectively inserted into the corresponding partition grooves (216).

8. The tearable peelable sheath as described in claim 7, characterized in that, The ends of the first plate (31) and the second plate (32) that are far apart from each other are both rounded.

9. The tearable peelable sheath as claimed in claim 1, characterized in that, The long diameter of the sheath tube (1) ranges from 19 to 21 Fr, and its short diameter ranges from 17 to 19 Fr.

10. A lithotripsy sheath kit for percutaneous nephrolithotomy, characterized in that, It includes the tearable peelable sheath as described in any one of claims 1-9.

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