Flexible ureteroscope sheath with adjustable inner diameter

Abstract

The invention discloses a flexible ureteroscope sheath with the adjustable inner diameter size, and relates to the technical field of medical instruments, and the flexible ureteroscope sheath is characterized by comprising an outer sheath tube, a first connector is arranged on the outer sheath tube, a tube diameter adjusting mechanism is arranged in the first connector, and the tube diameter adjusting mechanism is used for adjusting the tube diameter of the outer sheath tube; a first connector is arranged on the outer sheath tube, a side tube is arranged on the first connector, a pressure release valve is arranged on the side tube, an inner core is arranged in the outer sheath tube, and a conical expansion head is arranged at the bottom of the inner core. Flexible adjustment of the pipe diameter of the sheath pipe is achieved through the pipe diameter adjusting mechanism, the minimum inner diameter is adjusted during implantation, passing resistance is reduced, the pipe diameter is increased after the sheath pipe reaches a target position, the operation requirement is met, implantation convenience and operation practicability are both considered, the conical expansion head and the pressure release valve are matched, operation safety is improved, tissue damage and complication risks are reduced, and the operation efficiency is improved. And the medical silicone rubber material guarantees biocompatibility and durability, operation habits do not need to be changed, the popularization difficulty is reduced, and medical safety and economical efficiency are both achieved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a flexible ureteroscope sheath with adjustable inner diameter. Background Technology

[0002] In urological clinical treatment, flexible ureteroscopy is a commonly used minimally invasive technique for treating kidney stones, upper ureteral stones, and other conditions. One of the core procedures of this surgery is as follows: first, a super-slippery guidewire is inserted into the renal pelvis, and then a flexible ureteroscope sheath is inserted along the guidewire as the surgical working channel. The flexible endoscope moves in and out through this sheath to perform stone fragmentation and removal. The ease of sheath insertion and the suitability of the procedure directly affect the efficiency and safety of the surgery.

[0003] Currently used ureteroscopic sheaths in clinical practice are all fixed-diameter structures, classified primarily by their inner diameter. Common models include 9Fr, 10Fr, 11Fr, and 12Fr. During clinical procedures, medical staff need to select the appropriate sheath size based on the patient's ureteral condition and surgical requirements. The core design principle is to adapt the sheath to specific surgical scenarios by maintaining a fixed diameter.

[0004] However, existing fixed-diameter flexible ureteroscopic sheaths have significant technical drawbacks: On the one hand, while a thinner sheath makes it easier to pass through the ureter along the guidewire and reach the kidney, an excessively thin diameter restricts the operating space for lithotripsy and stone retrieval instruments, leading to greater surgical difficulty and lower efficiency. On the other hand, while a thicker sheath provides ample operating space and improves surgical convenience, its larger diameter also creates greater resistance during insertion, making it difficult to reach the target kidney location smoothly and preventing the surgery from proceeding normally. Furthermore, deviations in the selection of a fixed-diameter sheath may increase the risk of complications such as ureteral mucosal injury and abnormal renal pelvis pressure, making it difficult to balance the clinical needs of smooth insertion with operational practicality. This has become a key technical problem restricting the optimization of flexible ureteroscopic surgery.

[0005] Therefore, the present invention aims to provide a flexible ureteroscope sheath with adjustable inner diameter to solve the above-mentioned problems. Summary of the Invention

[0006] The purpose of this invention is to provide a flexible ureteroscope sheath with an adjustable inner diameter. This invention achieves flexible adjustment of the sheath diameter through a diameter adjustment mechanism. During insertion, the inner diameter is adjusted to the minimum to reduce passage resistance. After reaching the target position, the diameter is increased to meet operational requirements, balancing insertion convenience and operational practicality. It achieves precise positioning and controllable adjustment of the sheath diameter. Combined with a tapered dilator and a pressure relief valve, it improves surgical safety, reduces the risk of tissue damage and complications, and the medical-grade silicone rubber material ensures biocompatibility and durability. It is also compatible with commonly used clinical specifications, requiring no change in operating habits, reducing the difficulty of promotion, and combining medical safety with economy.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a ureteroscopic flexible sheath with adjustable inner diameter, comprising an outer sheath tube, a connector head provided on the outer sheath tube, a tube diameter adjustment mechanism provided inside the connector head, the tube diameter adjustment mechanism being used to adjust the tube diameter of the outer sheath tube, a side tube provided on the connector head, a pressure relief valve provided on the side tube, an inner core provided inside the outer sheath tube, and a conical expansion head provided at the bottom of the inner core.

[0008] By adopting the above technical solution, the diameter adjustment mechanism can flexibly adjust the diameter of the outer sheath. During the insertion phase, by adjusting the outer sheath to the minimum inner diameter, the resistance to passage through the ureteral pathway is reduced, solving the problem that existing large sheaths are difficult to insert into the kidney. After reaching the target position, the diameter is increased to meet the space requirements for lithotripsy and stone removal operations, solving the pain point of inconvenience in the operation of small sheaths. It balances the convenience of insertion and the practicality of operation, improving surgical efficiency. At the same time, the pressure relief valve on the side tube can balance the pressure inside and outside the sheath in real time, avoiding damage to the ureteral mucosa or renal pelvis tissue due to excessive pressure during sheath insertion or diameter adjustment, reducing the risk of surgical complications. In addition, the conical dilator at the bottom of the inner core has a guiding and dilating function, assisting the outer sheath to be smoothly advanced along the guidewire, reducing mechanical stimulation to the ureter during insertion, and further improving the smoothness and safety of insertion.

[0009] The present invention is further configured such that: the outer sheath tube includes at least two arc-shaped outer plates, an arc-shaped inner plate corresponding to the number of arc-shaped outer plates, an inner elastic membrane, and an outer elastic membrane; the inner elastic membrane is attached to the inner sidewall of the arc-shaped outer plate, the outer elastic membrane is attached to the outer sidewall of the arc-shaped outer plate, the arc-shaped outer plate is provided with an arc-shaped through groove, the arc-shaped inner plate is located in the arc-shaped through groove and slides along the arc-shaped through groove, and the arc-shaped inner plate is connected to the tube diameter adjustment mechanism.

[0010] By adopting the above technical solution, when the arc-shaped inner plate slides along the through groove of the arc-shaped outer plate, the elastic membrane can expand and contract synchronously with the change of tube diameter. This ensures both the flexibility of tube diameter adjustment and the sealing of the sheath, preventing leakage of irrigation fluid or backflow of body fluid during surgery and ensuring a stable surgical environment. At the same time, the sliding fit structure between the arc-shaped outer plate and the arc-shaped inner plate is stable, with no risk of jamming during adjustment. The double-layer design, with the inner elastic membrane covering the inner side of the arc-shaped outer plate and the outer elastic membrane covering the inner and outer sides of the arc-shaped outer plate, enhances the tear resistance and durability of the sheath, extends the service life of the device, and reduces the cost of surgical consumables.

[0011] The present invention is further configured such that: a limiting block is provided on the arc-shaped inner plate, a limiting groove is provided in the arc-shaped outer plate, and the limiting block is located in the limiting groove and slides along the limiting groove.

[0012] By adopting the above technical solution, the sliding stroke of the arc-shaped inner plate can be limited by the cooperation of the limiting block and the limiting groove, preventing the arc-shaped inner plate from sliding excessively and causing dislodgement or structural deformation, ensuring the precise range of tube diameter adjustment, avoiding damage to the sheath or ureter due to excessive adjustment, and improving the structural stability of the device and the safety of the operation.

[0013] The invention is further configured such that: the arc-shaped inner plate is provided with a snap-fit ​​protrusion, and the arc-shaped outer plate is provided with a plurality of snap-fit ​​grooves at equal intervals along the direction of the arc-shaped through groove, which match the snap-fit ​​protrusion; the distance between the plurality of snap-fit ​​grooves corresponds to the distance of pipe diameter adjustment.

[0014] By adopting the above technical solution, the precise positioning and fixation of the tube after diameter adjustment can be achieved by using the engagement of the snap-fit ​​protrusion and multiple equidistant snap-fit ​​grooves. This avoids unexpected changes in tube diameter caused by external force or operational vibration during the operation, ensuring the stability of the sheath tube diameter during the operation and improving the reliability of the surgical procedure. At the same time, the spacing of the snap-fit ​​grooves corresponds to the tube diameter adjustment distance, enabling precise step-like control of the tube diameter adjustment. Medical staff can quickly identify and switch the required tube diameter, simplifying the operation process and reducing human adjustment errors.

[0015] The present invention is further configured such that the number of the snap-fit ​​grooves is 4, and they correspond sequentially to the inner diameter specifications of the outer sheath tubes 9Fr, 10Fr, 11Fr, and 12Fr.

[0016] By adopting the above technical solution, the four snap-fit ​​grooves are precisely matched with the existing clinically commonly used 9Fr, 10Fr, 11Fr and 12Fr sheath inner diameter specifications, which fully meet the routine needs of clinical surgery. There is no need to change the operating habits of medical staff and the existing surgical instrument adaptation standards, which reduces the difficulty of clinical promotion and improves the practicality and compatibility of the device.

[0017] The present invention is further configured such that: the pipe diameter adjustment mechanism includes a second connector and a rotating head, the second connector is connected to the top of the arc-shaped inner plate, the rotating head is connected to the top of the second connector, and the inner core passes through the rotating head and the second connector and is located inside the outer sheath.

[0018] By adopting the above technical solution, the tube diameter adjustment mechanism is connected by a combination of connector two and a rotating head. This allows the rotational motion of the rotating head to be transmitted to the arc-shaped inner plate through connector two, enabling convenient tube diameter adjustment. Medical staff can operate it with one hand without additional auxiliary tools, improving operational convenience. At the same time, the through-type design of the inner core passing through the rotating head and connector two ensures that the inner core and the tube diameter adjustment mechanism do not interfere with each other. This guarantees the guiding and expansion function of the inner core without affecting the tube diameter adjustment action. The device has a compact structure, high space utilization, and is suitable for the operating space limitations of ureteroscopes.

[0019] The present invention is further configured such that anti-slip stripes are provided on the outer side wall of the rotating head.

[0020] By adopting the above technical solution, anti-slip stripes can be set on the outer wall of the rotating head to increase the friction between the hand and the rotating head, avoid slipping due to wet hands or nervous operation during the operation, ensure that the tube diameter adjustment is accurate and controllable, reduce the risk of misoperation, and further improve the stability of the surgical operation.

[0021] The present invention is further configured such that both the inner elastic membrane and the outer elastic membrane are made of medical-grade silicone rubber, which has good biocompatibility.

[0022] By adopting the above technical solution, the inner and outer elastic membranes are made of medical-grade silicone rubber, which gives them good biocompatibility. When in contact with human ureter and renal pelvis tissue, they are non-allergenic and non-irritating, reducing the risk of postoperative complications such as inflammation and infection, and improving the patient's surgical tolerance. At the same time, the medical-grade silicone rubber has excellent elasticity and anti-aging properties, ensuring the extensibility and durability of the sheath when the diameter is repeatedly adjusted, thus balancing biosafety and instrument practicality.

[0023] In summary, the present invention has the following beneficial effects:

[0024] 1. This invention enables flexible adjustment of the outer sheath diameter through a tube diameter adjustment mechanism. Adjusting to the minimum inner diameter during the insertion stage reduces the resistance of the ureteral passage, making it easy to reach the target position of the kidney and solving the problem of difficulty in inserting thick sheaths. After reaching the target position, the tube diameter is increased to meet the operating space required for lithotripsy and stone removal, overcoming the pain point of limited operation of thin sheaths and greatly improving surgical efficiency. At the same time, the locking groove accurately corresponds to the clinically commonly used 9Fr, 10Fr, 11Fr, and 12Fr inner diameter specifications, without changing the operating habits of medical staff, adapting to existing surgical instrument standards, and reducing the difficulty of clinical promotion.

[0025] 2. In this invention, the outer sheath adopts a composite structure of an arc-shaped outer plate, an arc-shaped inner plate, and an elastic membrane. This structure ensures both flexibility in diameter adjustment and maintains the sheath's sealing, preventing leakage of irrigation fluid or backflow of body fluid. At the same time, the cooperation between the limiting block and the limiting groove restricts the sliding stroke of the arc-shaped inner plate, preventing structural deformation or dislodgement. The engaging structure of the locking protrusion and the locking groove enables precise positioning after diameter adjustment, avoiding unexpected changes in diameter during surgery. The rotary adjustment mechanism, combined with the outer anti-slip stripes, allows for convenient one-handed operation, preventing accidental operation due to hand slippage and ensuring precise and controllable adjustment actions.

[0026] 3. The conical dilator at the bottom of the inner core in this invention can assist the sheath in advancing smoothly along the guidewire, reducing mechanical stimulation to the ureter. The pressure relief valve on the side tube can balance the pressure inside and outside the sheath in real time, avoiding excessive pressure that could damage tissue. The inner and outer elastic membranes are made of medical-grade silicone rubber, which has excellent biocompatibility, is non-allergenic and non-irritating, and can reduce the risk of postoperative complications such as inflammation and infection, and improve the patient's tolerance to surgery.

[0027] 4. The medical-grade silicone rubber material used in this invention has both good elasticity and anti-aging properties, ensuring the flexibility and durability of the outer sheath tube when the tube diameter is repeatedly adjusted. At the same time, the stable fit structure between the arc-shaped outer plate and the inner plate enhances the tear resistance of the sheath tube, extends the service life of the device, reduces the frequency of consumable replacement, and thus reduces medical costs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the appearance of an adjustable inner diameter flexible ureteroscope sheath according to an embodiment of the present invention;

[0029] Figure 2 This is a front cross-sectional view of an adjustable inner diameter ureteroscope sheath according to an embodiment of the present invention.

[0030] Figure 3 This is a schematic cross-sectional view of the increased diameter of the outer sheath tube in an embodiment of the present invention;

[0031] Figure 4 This is a schematic cross-sectional view of the reduced diameter of the outer sheath tube in an embodiment of the present invention;

[0032] Figure 5 yes Figure 3 Enlarged view of point A in the middle;

[0033] Figure 6 yes Figure 4 Enlarged diagram of point B in the middle.

[0034] In the diagram: 1. Outer sheath; 2. Connector 1; 3. Side tube; 4. Pressure relief valve; 5. Inner core; 6. Conical expansion head; 7. Arc-shaped outer plate; 8. Arc-shaped inner plate; 9. Inner elastic membrane; 10. Outer elastic membrane; 11. Arc-shaped through groove; 12. Limiting block; 13. Limiting groove; 14. Snap-fit ​​protrusion; 15. Snap-fit ​​groove; 16. Connector 2; 17. Rotating head; 18. Anti-slip stripes. Detailed Implementation

[0035] The following is in conjunction with the appendix Figures 1-6 The present invention will be described in further detail below.

[0036] Example: A flexible ureteroscope sheath with adjustable inner diameter includes an outer sheath 1. A connector 2 is fixedly installed at the top of the outer sheath 1. A diameter adjustment mechanism is provided inside the connector 2. The diameter adjustment mechanism is used to adjust the diameter of the outer sheath 1. During the insertion stage, the outer sheath 1 is adjusted to the minimum inner diameter to reduce the resistance of the ureteral passage. After reaching the target position, the diameter is increased to meet the space requirements of lithotripsy and stone removal operations. A pressure relief valve 4 is provided on the side tube 3 to balance the pressure inside and outside the sheath in real time, avoiding damage to the ureteral mucosa or renal pelvis tissue due to excessive pressure during sheath insertion or diameter adjustment. A matching inner core 5 is installed inside the outer sheath 1. A conical dilator 6 is provided at the bottom of the inner core 5, which has a guiding and dilating function to assist the outer sheath 1 in smooth advancement along the guidewire, reduce mechanical stimulation of the ureter during insertion, and improve the smoothness and safety of insertion.

[0037] In this preferred embodiment, the outer sheath 1 includes four arc-shaped outer plates 7, four arc-shaped inner plates 8, an inner elastic membrane 9, and an outer elastic membrane 10. The inner elastic membrane 9 is attached to the inner sidewall of the arc-shaped outer plate 7, and the outer elastic membrane 10 is attached to the outer sidewall of the arc-shaped outer plate 7. An arc-shaped through groove 11 is provided on the arc-shaped outer plate 7. The arc-shaped inner plate 8 is located within the arc-shaped through groove 11 and slides along the arc-shaped through groove 11. The arc-shaped inner plate 8 is connected to the pipe diameter adjustment mechanism. When the arc-shaped inner plate 8 slides along the through groove of the arc-shaped outer plate 7, the elastic membrane... The membrane can expand and contract synchronously with changes in tube diameter, ensuring both flexibility in tube diameter adjustment and maintaining the sheath's seal to prevent intraoperative irrigation fluid leakage or fluid reflux, thus ensuring a stable surgical environment. At the same time, the sliding fit structure between the arc-shaped outer plate 7 and the arc-shaped inner plate 8 is stable, eliminating the risk of jamming during adjustment. The double-layer design, with the inner elastic membrane 9 covering the inner side of the arc-shaped outer plate 7 and the outer elastic membrane 10 covering the inner and outer sides of the arc-shaped outer plate 7, enhances the sheath's tear resistance and durability, extends the device's lifespan, and reduces surgical consumable costs.

[0038] In this preferred embodiment, a limiting block 12 is provided on the arc-shaped inner plate 8, and a limiting groove 13 is provided in the arc-shaped outer plate 7. The limiting block 12 is located in the limiting groove 13 and slides along the limiting groove 13. The cooperation between the limiting block 12 and the limiting groove 13 can limit the sliding stroke of the arc-shaped inner plate 8, prevent the arc-shaped inner plate 8 from sliding excessively and causing dislodgement or structural deformation, ensure the accurate range of tube diameter adjustment, avoid damage to the sheath or ureter caused by excessive adjustment, and improve the structural stability of the device and the safety of the operation.

[0039] In this preferred embodiment, the arc-shaped inner plate 8 is provided with a snap-fit ​​protrusion 14, and the arc-shaped outer plate 7 is provided with multiple snap-fit ​​grooves 15 at equal intervals along the direction of the arc-shaped through groove 11, which match the snap-fit ​​protrusion 14. The distance between the multiple snap-fit ​​grooves 15 corresponds to the tube diameter adjustment distance. By using the snap-fit ​​protrusion 14 and the multiple equidistant snap-fit ​​grooves 15, the tube diameter can be accurately positioned and fixed after adjustment, avoiding unexpected changes in tube diameter due to external force or operation vibration during the operation, ensuring the stability of the sheath tube diameter during the operation, and improving the reliability of the surgical operation. At the same time, the spacing of the snap-fit ​​grooves 15 corresponds to the tube diameter adjustment distance, so that the tube diameter adjustment is precisely controlled in a step-like manner. Medical staff can quickly identify and switch the required tube diameter, simplify the operation process, and reduce human adjustment errors.

[0040] In this preferred embodiment, there are four locking grooves 15, which correspond sequentially to the inner diameter specifications of the outer sheath tubes 19Fr, 10Fr, 11Fr, and 12Fr. By precisely matching the four locking grooves 15 to the existing clinically commonly used inner diameter specifications of 9Fr, 10Fr, 11Fr, and 12Fr sheath tubes, the device fully meets the routine needs of clinical surgery. It does not require changing the operating habits of medical staff or the existing surgical instrument adaptation standards, reducing the difficulty of clinical promotion and improving the practicality and compatibility of the device.

[0041] In this preferred embodiment, the tube diameter adjustment mechanism includes a second connector 16 and a rotating head 17. The second connector 16 is connected to the top of the arc-shaped inner plate 8, and the rotating head 17 is connected to the top of the second connector 16. The inner core 5 passes through the rotating head 17 and the second connector 16 and is located inside the outer sheath 1. By using the combination of the second connector 16 and the rotating head 17 to connect the tube diameter adjustment mechanism, the rotational action of the rotating head 17 can be transmitted to the arc-shaped inner plate 8 through the second connector 16, realizing convenient tube diameter adjustment. Medical staff can operate it with one hand without additional auxiliary tools, improving the ease of operation. At the same time, the through-type design of the inner core 5 passing through the rotating head 17 and the second connector 16 ensures that the inner core 5 and the tube diameter adjustment mechanism do not interfere with each other, ensuring the guiding expansion function of the inner core 5 without affecting the tube diameter adjustment action. The device has a compact structure, high space utilization, and is suitable for the operating space limitations of ureteroscopes.

[0042] In this preferred embodiment, the outer wall of the rotating head 17 is provided with anti-slip stripes 18, which can increase the friction between the hand and the rotating head 17, avoid slipping due to wet hands or nervous operation during the operation, ensure that the tube diameter adjustment action is accurate and controllable, reduce the risk of misoperation, and further improve the stability of the surgical operation.

[0043] In this preferred embodiment, both the inner elastic membrane 9 and the outer elastic membrane 10 are made of medical-grade silicone rubber, which gives them good biocompatibility. When in contact with human ureter and renal pelvis tissue, they are non-allergenic and non-irritating, reducing the risk of postoperative complications such as inflammation and infection, and improving the patient's surgical tolerance. At the same time, medical-grade silicone rubber has excellent elasticity and anti-aging properties, ensuring the extensibility and durability of the sheath when the diameter is repeatedly adjusted, thus balancing biosafety and instrument practicality.

[0044] Working principle: During the insertion procedure, the super-slippery guidewire is first inserted into the renal pelvis. Then, the inner core 5 of this device is combined with the outer sheath 1. Guided by the conical expansion head 6 at the bottom of the inner core 5, the outer sheath 1 is pushed towards the kidney along the guidewire. Before pushing, the diameter adjustment mechanism is adjusted by rotating head 17 to shrink the arc-shaped inner plate 8 to its minimum stroke, so that the outer sheath 1 is in the minimum inner diameter state, reducing the resistance to passage. When the outer sheath 1 reaches the target position, the rotating head 17 of the anti-slip stripe 18 is rotated, and the arc-shaped inner plate 8 is driven to slide along the through groove of the arc-shaped outer plate 7 through the connecting head 2 16, adjusting the diameter of the outer sheath 1 to the required specification. The locking protrusion 14 is engaged and fixed with the corresponding locking groove 15. During the operation, the pressure relief valve 4 balances the pressure inside and outside the sheath through the side tube 3. The flexible endoscope enters and exits through the working channel formed by the outer sheath 1 to complete the lithotripsy and stone removal operation. After the operation, the diameter adjustment mechanism is reversed to reduce the inner diameter of the outer sheath 1, so as to facilitate the smooth removal of the device.

[0045] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A flexible ureteroscope sheath with adjustable inner diameter, characterized in that: Includes an outer sheath tube (1), a connector (2) is provided on the outer sheath tube (1), a pipe diameter adjustment mechanism is provided inside the connector (2), the pipe diameter adjustment mechanism is used to adjust the pipe diameter of the outer sheath tube (1), a side tube (3) is provided on the connector (2), a pressure relief valve (4) is provided on the side tube (3), an inner core (5) is provided inside the outer sheath tube (1), and a conical expansion head (6) is provided at the bottom of the inner core (5).

2. The ureteroscope sheath with adjustable inner diameter according to claim 1, characterized in that: The outer sheath (1) includes at least two arc-shaped outer plates (7), an arc-shaped inner plate (8) corresponding to the number of arc-shaped outer plates (7), an inner elastic membrane (9), and an outer elastic membrane (10); the inner elastic membrane (9) is attached to the inner sidewall of the arc-shaped outer plate (7), and the outer elastic membrane (10) is attached to the outer sidewall of the arc-shaped outer plate (7). The arc-shaped outer plate (7) is provided with an arc-shaped through groove (11), and the arc-shaped inner plate (8) is located in the arc-shaped through groove (11) and slides along the arc-shaped through groove (11). The arc-shaped inner plate (8) is connected to the pipe diameter adjustment mechanism.

3. The ureteroscope sheath with adjustable inner diameter according to claim 2, characterized in that: The arc-shaped inner plate (8) is provided with a limiting block (12), and the arc-shaped outer plate (7) is provided with a limiting groove (13). The limiting block (12) is located in the limiting groove (13) and slides along the limiting groove (13).

4. The ureteroscope sheath with adjustable inner diameter according to claim 3, characterized in that: The arc-shaped inner plate (8) is provided with snap-fit ​​protrusions (14), and the arc-shaped outer plate (7) is provided with multiple snap-fit ​​grooves (15) that match the snap-fit ​​protrusions (14) at equal intervals along the direction of the arc-shaped through groove (11). The distance between the multiple snap-fit ​​grooves (15) corresponds to the distance of pipe diameter adjustment.

5. The ureteroscope sheath with adjustable inner diameter according to claim 4, characterized in that: The number of the snap-fit ​​grooves (15) is 4, and they correspond to the inner diameter specifications of the outer sheath tubes (1) 9Fr, 10Fr, 11Fr and 12Fr in sequence.

6. The ureteroscope sheath with adjustable inner diameter according to claim 1, characterized in that: The pipe diameter adjustment mechanism includes a second connector (16) and a rotating head (17). The second connector (16) is connected to the top of the arc-shaped inner plate (8), and the rotating head (17) is connected to the top of the second connector (16). The inner core (5) passes through the rotating head (17) and the second connector (16) and is located inside the outer sheath (1).

7. A ureteroscope sheath with adjustable inner diameter according to claim 6, characterized in that: The outer wall of the rotating head (17) is provided with anti-slip stripes (18).

8. The ureteroscope sheath with adjustable inner diameter according to claim 2, characterized in that: Both the inner elastic membrane (9) and the outer elastic membrane (10) are made of medical-grade silicone rubber, which has good biocompatibility.

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