Bending-adjustable ureter guiding sheath

Abstract

The utility model provides a ureter guiding sheath capable of being bent, which comprises a handle part and an intubation tube suitable for being inserted into a ureter, a central channel extending from a near end to a far end is limited in the intubation tube, an inlet communicated with the central channel of the intubation tube is limited by the handle part, and the inlet is communicated with the central channel of the intubation tube. A sealing valve is arranged at the inlet so that an instrument can penetrate through the center channel in a sealed mode and then enter the center channel, the handle portion is provided with a negative pressure connector communicated with the center channel, the ureter guiding sheath further comprises at least one pull wire, and the cannula is provided with a near end and a far end. The cannula sequentially comprises a main body section and a far side section in the direction from the near end to the far end, and at least part of the far side section is a flexible section; the pull wire extends in the longitudinal direction and is arranged in the cannula wall, the far end of the pull wire is fixedly connected to the far side section, and the pull wire is controlled by the handle part to longitudinally move relative to the main body section so as to drive the flexible section to deflect.

Description

Technical Field

[0001] This utility model relates to medical devices, specifically to an adjustable ureteral guide sheath. Background Technology

[0002] Currently, natural orifice pyelolithotomy primarily utilizes a ureteral guiding sheath and a flexible ureteroscope. The ureteral guiding sheath is inserted into the urinary tract through the patient's urethra to establish an effective passage, allowing surgical instruments such as the flexible ureteroscope to smoothly enter and exit the urinary tract for lithotripsy. During the procedure, current technology involves water entering the working channel of the endoscope and exiting through the gap between the endoscope and the sheath, creating a negative pressure suction to promptly remove the laser-dislodged stone fragments. The existing sheath tip is flexible, relying on the serpentine section of the flexible endoscope for bending. Current serpentine designs are either laser-cut metal tubes or riveted metal components. During bending, gaps may appear between each segment of the serpentine, potentially causing accidental damage upon closure. A protective tube is also needed to cover the serpentine to prevent tissue abrasion, but this protective tube needs to adapt to the bending of the serpentine, leading to wrinkling. These wrinkles may cause obstruction or minor damage during entry and exit within the urinary system.

[0003] In current endoscopic surgery, to reach the target stone location, the tip of the endpiece is rotated vertically and horizontally using a serpentine tube. This is done in conjunction with rotating the handle. In hard-to-reach locations, the surgeon needs to rotate the handle continuously, which puts a heavy strain on the surgeon's arm. Furthermore, the tube is prone to damage during the constant twisting process. In addition, the bending angle of the serpentine tube is relatively limited, and the flexible endoscope and sheath are often rotated to adjust the direction, making the operation cumbersome. Utility Model Content

[0004] This invention provides an adjustable ureteral guide sheath, comprising a handle and a cannula suitable for insertion into the ureter. The handle is connected to the proximal end of the cannula, and the cannula defines a central channel extending from the proximal end to the distal end. The handle defines an inlet communicating with the central channel of the cannula, and the inlet is provided with a sealing valve to allow the instrument to pass through the central channel in a sealed manner. The handle has a negative pressure connector communicating with the central channel. The cannula has a proximal end and a distal end, and the cannula includes a main body segment and a distal segment in sequence from the proximal end to the distal end. At least a portion of the distal segment is a flexible segment. The ureteral guide sheath also includes at least one pull wire, which extends longitudinally and is disposed within the cannula wall. The distal end of the pull wire is fixedly connected to the distal segment. When the pull wire moves longitudinally relative to the main body segment, it causes the flexible segment to deflect.

[0005] In some embodiments, the distal segment includes a flexible segment and a head end in the direction from the proximal end to the distal end, the head end being connected to the proximal end of the flexible segment, and the distal end of the draw wire being connected to the distal end or the head end of the flexible segment.

[0006] In some embodiments, a pull wire outer tube is fixed inside the wall of the cannula, the pull wire extends longitudinally inside the pull wire outer tube, and the proximal end of the pull wire is controlled by a handle.

[0007] In some embodiments, the cannula is provided with four longitudinally extending pull wires, which are evenly spaced.

[0008] In some implementations, the distal end of the draw wire is connected to the distal or head end of the flexible segment.

[0009] In some embodiments, the head end has a circumferential fixing member, and the pull wire is circumferentially fixedly connected to the circumferential fixing member at intervals.

[0010] In some embodiments, the main body segment is a rigid pipe segment; in some specific embodiments, the rigid pipe segment includes a proximal segment and a distal segment, wherein the hardness of the distal segment is less than that of the proximal segment.

[0011] In some embodiments, the wall of the flexible segment includes an outer tube, a support layer, and an inner tube, with the support layer formed between the outer tube and the inner tube, and the pull wires disposed inside any of the outer tube, the support layer, and the inner tube or in the gap between them.

[0012] In some embodiments, the support layer is an elastic layer.

[0013] In some embodiments, the head end includes an outer tube, a circumferential fixing member, and an inner tube, wherein the circumferential fixing member is disposed between the outer tube and the inner tube, and the distal ends of the at least four pull wires are fixed to the circumferential fixing member.

[0014] In some embodiments, the handle includes at least four power transmission components, the proximal end of the pull cable is disposed on the power transmission component, the power transmission component is adapted to be connected to a motor, and each pull cable is driven by the power transmission machine to slide longitudinally; preferably, the power transmission component is a turntable, the proximal end of the pull cable is wound on the turntable, and the counterclockwise or clockwise rotation of the turntable drives the pull cable to move longitudinally to the proximal or distal side.

[0015] In some embodiments, multiple longitudinally extending arched limiting grooves are formed inside the wall of the insertion tube, and the multiple limiting grooves are arranged at equal intervals along the wall of the insertion tube, with the pull wire outer tube embedded in the limiting groove.

[0016] In some embodiments, the catheter includes:

[0017] A slender cannula having a proximal end and a distal end, the cannula comprising a main body segment and a distal segment in sequence along a direction from the proximal end to the distal end, wherein at least a portion of the distal segment is a flexible segment.

[0018] The handle portion is connected to the proximal end of the cannula;

[0019] Four pull wires extend longitudinally and are located within the cannula wall. The distal ends of the four pull wires are fixedly connected to the distal section. The four pull wires are evenly spaced and controlled by a handle to move independently longitudinally relative to the main body section, thereby bending the flexible segment to any angle. The direction adjustment steps of the flexible segment include:

[0020] The four-way deflection of the flexible segment is driven by the independent longitudinal movement of the four pull wires. The four-way deflection includes left deflection, right deflection, upward deflection, and downward deflection. The left and right direction is defined as the X-axis, and the upward and downward direction is defined as the Y-axis. The X-axis passes through the center of the cannula and is perpendicular to the Y-axis. The X-axis and the Y-axis form the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant.

[0021] The longitudinal movement of the same displacement of two adjacent guy wires causes the flexible segment to deflect in the directions of 45°, 135°, 225° and 315° in the first quadrant, second quadrant, third quadrant and fourth quadrant respectively.

[0022] The longitudinal movement of the two adjacent guy wires with different displacements causes the flexible segment to deflect in the directions of 0-45°, 45°-90°, 90°-135°, 135°-180°, 180°-225°, 225°-270°, 270°-315°, and 315°-360° in the first, second, third, and fourth quadrants, respectively.

[0023] In some implementations, the travel of the draw wire controls the deflection angle of the flexible segment.

[0024] In some embodiments, the catheter is a ureteral sheath, the cannula wall defines a central channel, the handle defines an inlet communicating with the central channel, the inlet is provided with a sealing valve for the instrument to enter in a sealed manner, and the handle is provided with a negative pressure connector communicating with the central channel, the negative pressure connector being adapted to be connected to a negative pressure suction device.

[0025] In some embodiments, the catheter has a functional tip.

[0026] The catheter provided by this utility model can be deflected and bent in any direction, and can reach any angle without rotating the catheter. Compared with the structure of an endoscope, it avoids the use of parts such as snake bones, reducing costs. The integrated tube body can avoid wrinkles and can enter and exit the human body very smoothly.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Figures 1-4 A schematic diagram of the structure of the unidirectional deflectable conduit provided by this utility model;

[0029] Figures 5-7 A schematic diagram of the structure of the bidirectional deflectable catheter provided by this utility model;

[0030] Figures 8-10 A schematic diagram of the structure of the multidirectional deflectable conduit provided by this utility model;

[0031] Figures 11-13 A schematic diagram of the orientation method for the multidirectional deflectable conduit provided by this utility model;

[0032] Figures 14-16 A schematic diagram of the fixing structure of the pull wire and anchor ring provided by this utility model;

[0033] Figure 17 This is a schematic diagram of the internal structure of the handle portion of this utility model;

[0034] Figure 18 for Figure 17 A magnified view of a portion of the image. Detailed Implementation

[0035] The present invention or its technical solutions will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings;

[0036] In the description of this invention, "proximal" and "proximal side" refer to the end of the medical device that is closer to the doctor during normal operation, while "distal" and "distal side" usually refer to the end that first enters the patient's body.

[0037] In the description of this invention, it should be noted that, unless otherwise specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0038] Please see Figure 1 The existing ureteral guiding sheath includes a handle portion 2 and a cannula 1 adapted for insertion into the ureter. The handle portion 2 is connected to the proximal end of the cannula 1. The cannula 2 defines a central channel extending from the proximal end to the distal end. The handle portion defines an inlet communicating with the central channel of the cannula. A sealing valve is provided at the inlet to allow the instrument to pass through and enter the central channel in a sealed manner. The handle portion has a negative pressure connector 111 communicating with the central channel.

[0039] The cannula 1 has a proximal end and a distal end. This embodiment provides an adjustable ureteral guide sheath. The cannula 1 includes a main body segment 11 and a distal segment 12 in sequence from the proximal end to the distal end. At least a portion of the distal segment 12 is a flexible segment. The handle 2 is connected to the proximal end of the cannula 1. Thus, one or more pull wires can be installed inside the cannula wall, and the pull wires can drive the bending deformation of the flexible segment.

[0040] In some embodiments, please refer to Figures 2-4 The distal segment 12 is a flexible tube segment, and the main body segment 11 is a rigid tube segment. A pull wire 30 is installed inside the tube wall, and the pull wire 30 is slidably pulled into the outer tube 31. The distal end of the pull wire is fixed to the distal segment 12 and is operated by the handle 2 to drive the pull wire 30 to move longitudinally relative to the main body segment 11, thereby causing the flexible segment to deflect. Thus, pulling the pull wire 30 will cause the flexible segment to deflect relative to the main body segment 11 in an upward direction. In other embodiments, please refer to... Figures 5-7 Two pull wires 30 are symmetrically arranged inside the cannula wall. Pulling the pull wires 30 causes the flexible segment to deflect upward or downward. During renal pelvic surgery, if the target object, such as a stone, polyp, tumor, or blood clot, is located in another position, the user can adjust the direction of the cannula tip by frequently rotating the catheter.

[0041] In an embodiment of the present invention, please refer to Figure 8 The catheter includes four pull wires 301, 302, 303, and 304. The four pull wires 301, 302, 303, and 304 extend longitudinally and are located inside the cannula wall. The distal ends of the four pull wires 301, 302, 303, and 304 are fixedly connected to the distal segment. The four pull wires 301, 302, 303, and 304 are evenly spaced. The four pull wires 301, 302, 303, and 304 are controlled by the handle 2 to move longitudinally relative to the main body segment 11, thereby causing the flexible segment to deflect to any direction and any angle.

[0042] The method for adjusting in any direction here is as follows: Please refer to [link / reference]. Figure 11The four individual guy wires 301, 302, 303, and 304 independently move longitudinally, causing the flexible segment to deflect in four directions: left, right, upward, and downward. Here, the left-right direction is defined as the X-axis, and the upward-downward direction as the Y-axis. The X-axis passes through the cannula's axis and intersects the Y-axis perpendicularly. The X-axis and Y-axis form a two-dimensional coordinate system, dividing the XY plane into quadrants A, B, C, and D. The angles in the first quadrant range from 0° to 90°, the second quadrant from 90° to 180°, the third quadrant from 180° to 270°, and the fourth quadrant from 270° to 360°.

[0043] Please see Figure 12 By pulling any two wires with the same tension or the same stroke, the flexible segment can be deflected in the 45° direction in the corresponding quadrant; that is, the longitudinal movement of the same displacement of the two adjacent wires causes the flexible segment to deflect in the 45°, 135°, 225° and 315° directions in the first quadrant, second quadrant, third quadrant and fourth quadrant respectively.

[0044] Please see Figure 13 By pulling any two wires with different tensions or different strokes, the flexible segment can be deflected in any direction within the corresponding quadrant. That is, the longitudinal movement of the two adjacent wires with different displacements causes the flexible segment to deflect in the directions of 0-45°, 45°-90°, 90°-135°, 135°-180°, 180°-225°, 225°-270°, 270°-315°, and 315°-360° in the first, second, third, and fourth quadrants, respectively. The deflection angle range here does not include the endpoints.

[0045] As described above, the independent or combined movement of the four drawstrings allows the flexible segment to deflect in any direction within 360°, enabling the user to align the flexible segment with any position within the cavity as needed during surgery, without frequent rotation of the endoscope or catheter. Using four or more drawstrings allows for independent adjustment of the catheter tip in multiple directions. Each drawstring can drive the flexible segment to deflect at different angles, thus achieving more complex movements and covering a wider range of angles and directions to meet the diverse angular needs of surgical procedures. In handling complex surgical cases, such as navigation within narrow or tortuous anatomical structures, the design of at least four drawstrings enables simultaneous multi-directional operation, allowing the catheter to flexibly respond to different surgical needs and real-time changes, effectively improving the success rate of the surgery.

[0046] Understandably, to ensure smooth longitudinal movement of the string, please refer to [the relevant documentation / reference]. Figure 8The cannula 1 has four pull-wire outer tubes 311, 312, 313, and 314 fixed inside its wall. Pull wires 301, 302, 303, and 304 extend longitudinally within these outer tubes. The proximal ends of the pull wires 301, 302, 303, and 304 are controlled by a handle 2. In this embodiment, the cannula 1 has four pull-wire outer tubes 311, 312, 313, and 314 inside its wall. Pull wires 301, 302, 303, and 304 pass through these outer tubes. Pulling the pull wires causes them to slide within the outer tubes 311, 312, 313, and 314. For example, one can first pull one of the lines in the target quadrant area, and then adjust the direction by pulling another adjacent line. Alternatively, both lines can be pulled at the same time, and adjusting both lines simultaneously can quickly help the doctor align the head with the target position.

[0047] After adjusting the direction of the flexible segment by pulling the string, the deflection angle of the flexible segment is controlled by adjusting the travel of the string.

[0048] To better achieve directional adjustment of the flexible segment, the distal segment, from the proximal end to the distal end, includes the flexible segment and the head end 13. Specifically, the flexible segment is attached between the head end 13 and the main body segment 11. The head end 13 is connected to the proximal end of the flexible segment, and the distal ends of the pull wires 301, 302, 303, and 304 are connected to the distal end or head end of the flexible segment. In some examples, the pull wires 301, 302, 303, and 304 can be fixed at any node of the flexible segment or at the distal end adjacent to the flexible segment, thus enabling deflection of the flexible segment.

[0049] In this embodiment, pull wires 301, 302, 303, and 304 are connected to the cannula tip 13. Pulling the pull wires causes the flexible segment to deflect, which in turn causes the tip to deflect naturally. As mentioned earlier, in order to achieve the discharge of the target object, the tip is designed as a functional tip, for example, equipped with an infusion port, a suction port, a laser port, and a camera. The tip is rigid and difficult to bend or deform. In this case, the tip, with the help of the deflection of the flexible segment, causes the functional tip to deflect to the target position for liquid infusion, suction, laser lithotripsy, and visual operation.

[0050] For easier securing of the distal end of the guy wire, please refer to [link / reference]. Figures 14-16The head end has a circumferential fixing member 6, and the pull wires 301, 302, 303, and 304 are circumferentially fixedly connected to the circumferential fixing member 6 at intervals. In some embodiments, the head end 13 includes a tube body and the circumferential fixing member 6 disposed within the tube body. In this embodiment, the circumferential fixing member is specifically implemented as an anchoring ring. The head end 13 includes an outer tube, an anchoring ring, and an inner tube. The anchoring ring is disposed between the outer tube and the inner tube, and the distal ends of the four pull wires 301, 302, 303, and 304 are fixed to the circumferential fixing member 6. Exemplarily, the pull wires 301, 302, 303, and 304 are fixedly connected to the anchoring ring by laser welding, soldering, or crimping. This ensures that the direction of the pull wires will not be significantly deviated after fixing, and also strengthens the directionality of the pull wires during the tube body forming process.

[0051] In this embodiment, please refer to Figure 1 The main body segment 11 is a rigid pipe segment. The rigid pipe segment has varying hardness. In some embodiments, the rigid pipe segment includes a first pipe segment and a second pipe segment, with the second pipe segment located at the distal end of the first pipe segment. The hardness of the second pipe segment is between that of the first pipe segment and the flexible segment, and it is attached between the first pipe segment and the flexible segment. This gradual hardness design extends the service life of the conduit when the flexible segment deflects. The wall of the flexible segment includes an outer pipe, a support layer, and an inner pipe. The pull wire is located inside any of the outer pipe, support layer, and inner pipe, or in the gap between them. In this embodiment, please refer to... Figure 8 and Figure 9 The aforementioned pull wires 301, 302, 303, and 304 are all located inside the inner tube.

[0052] In some embodiments of the present invention, please refer to Figure 17 The handle portion 2 includes four power transmission components 71, 72, 73, and 74. The proximal ends of the pull cables 301, 302, 303, and 304 are located on the power transmission components 71, 72, 73, and 74. The power transmission components are adapted to connect to a motor, and each pull cable is driven by the power transmission motor to move longitudinally. For example, the power transmission component is a turntable, and the proximal ends of the pull cables are wound on the turntable. The counterclockwise or clockwise rotation of the turntable drives the pull cables to move longitudinally proximally or distally. Each of the four pull cables is controlled by a separate motor. Inside the handle portion of the guide tube, each individual pull cable is connected via a turntable. The turntable is connected to a corresponding mating part on the equipment, transmitting the power of the motor on the equipment to the turntable, and then through the pull cables to the bending angle of the guide tube head.

[0053] A single motor controlling a single cable allows for bending in four directions. Two adjacent motors using the same force to control two adjacent cables allow for bending in eight directions. If two adjacent motors use different forces to control two adjacent cables, precise angle control can be achieved through precise force control. This allows for omnidirectional adjustment beyond just eight-way bending, ultimately achieving any angle without rotation. The handle operation is simplified and made more user-friendly. Physicians can achieve various deflection methods through different cable combinations, reducing hand fatigue and improving operational comfort and ease of control.

[0054] Multiple longitudinally extending arched limiting grooves are formed within the cannula wall. These grooves are evenly spaced along the cannula wall. The pull-wire outer tube is embedded in these grooves, meaning it is confined within the arched grooves. Compared to a circular cavity, this design prevents the pull-wire outer tube from shifting during manufacturing, avoiding overall confusion in the four directions due to skewed pull-wire angles. This ensures the equidistant distribution of the four pull wires and guarantees precise directional adjustment. The evenly distributed pull wires allow for more precise control of the catheter's movement, reducing swaying or errors during deflection.

[0055] Based on the technical concept of the present invention, those skilled in the art can design various pull cables to achieve more flexible directional adjustment, such as setting up six pull cables, based on the four-pull cable design concept provided in the embodiments. Two adjacent pull cables may perform similar functions, but are coordinated to achieve more precise directional control. A more complex handle can be designed, including more power transmission components (such as motors, turntables, etc.). Each motor controls one or two pull cables, or a single motor controls multiple pull cables through a transmission mechanism, to achieve complex deflection angles through the control of individual or combined pull cables. For example, any two adjacent pull cables can be operated simultaneously with different or the same tension to achieve fine directional adjustment.

[0056] In some application scenarios, please refer to Figure 1 The catheter is a ureteral sheath, the cannula wall defines a central channel, the handle defines an inlet communicating with the central channel, the inlet is provided with a sealing valve for the instrument to enter in a sealed manner, and the handle is provided with a negative pressure connector communicating with the central channel, which is suitable for connection with a negative pressure suction device.

[0057] In other applications, the catheter is a visual catheter, similar in function to an endoscope. It has instrument channels, drainage channels, and suction channels. Correspondingly, the tip of the catheter includes an irrigation port, a suction port, a camera, etc. Please refer to [link to relevant documentation]. Figure 17 and Figure 18The handle includes a handle housing 21, an infusion connector 33, a negative pressure connector 34, and an instrument inlet 32 ​​disposed on the handle housing 21; the drainage channel is separated from the instrument channel, the suction channel is connected to the negative pressure connector 34, the drainage channel is connected to the infusion connector 33, and the instrument channel is connected to the instrument interface 32. A camera is installed at the insertion tube tip to facilitate the doctor's understanding of the target cavity. The instrument channel is used for external instruments such as laser beams to pass through and reach the tip to crush stones in the renal pelvis or cut tissue, etc. Liquid is injected into the body cavity through the drainage channel, and the liquid in the cavity containing stones or tissue is aspirated out of the body through the suction channel.

[0058] The catheter provided by this invention can be deflected and bent in any direction.

[0059] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An adjustable curved ureteral introducer sheath comprising a handle portion and a cannula adapted for insertion into a ureter, said handle portion being connected to a proximal end of the cannula, said cannula defining a central passageway extending from the proximal end toward a distal end, said handle portion defining an inlet port in communication with the central passageway of the cannula, said inlet port being provided with a sealing valve for sealing passage of an instrument into the central passageway, said handle portion having a negative pressure port in communication with the central passageway, characterized in that, The intubation tube has a proximal end and a distal end, and comprises a main body section and a distal section in sequence from the proximal end to the distal end, at least part of the distal section being a flexible section; the ureter guide sheath further comprises at least one pull wire, which extends longitudinally and is arranged inside the tube wall of the intubation tube, the distal end of the pull wire being fixedly connected to the distal section, and the flexible section being deflected when the pull wire moves longitudally relative to the main body section.

2. The adjustable curved ureteral guide sheath of claim 1, wherein, The distal section comprises a flexible section and a head end from the proximal end to the distal end, the head end being connected to the distal end of the flexible section, and the distal end of the pull wire being connected to the distal end of the flexible section or the head end.

3. The deflectable ureteral guide sheath of claim 1, wherein, The pull wire longitudally extends inside a pull wire outer tube fixedly arranged inside the intubation tube, and the proximal end of the pull wire is controlled by the handle.

4. The deflectable ureteral guide sheath of claim 1, wherein, The intubation tube is internally provided with four pull wires extending longitudally, which are distributed at equal intervals.

5. The deflectable ureteral guide sheath of claim 2, wherein, The distal end of the pull wire is connected to the distal end of the flexible section or the head end.

6. The deflectable ureteral guide sheath of claim 2, wherein, The head end is provided with a circumferential fixing member, and the pull wire is circumferentially fixedly connected to the circumferential fixing member at intervals.

7. The deflectable ureteral guide sheath of claim 2, wherein, The main body section is a rigid tube section.

8. The deflectable ureteral guide sheath of claim 7, wherein, The rigid tube section comprises a proximal section and a distal section, and the hardness of the distal section is less than that of the proximal section.

9. The deflectable ureteral guide sheath of claim 2, wherein, The tube wall of the flexible section comprises an outer tube, a support layer and an inner tube, the support layer being formed between the outer tube and the inner tube, and the pull wire is arranged inside any one of the outer tube, the support layer and the inner tube or the gap therebetween.

10. The adjustable curved ureteral guide sheath of claim 9, wherein, The support layer is an elastic layer.

11. The deflectable ureteral guide sheath of claim 2, wherein, The head end comprises an outer tube, a circumferential fixing member and an inner tube, the circumferential fixing member being arranged between the outer tube and the inner tube, and the distal end of the pull wire is fixed to the circumferential fixing member.

12. The adjustable curved ureteral guide sheath of claim 11, wherein, The handle comprises a power transmission member, the proximal end of the pull wire is arranged in the power transmission member, and the power transmission member is adapted to be connected to an electric motor, and each pull wire is longitudally slid by the power transmission member.

13. The deflectable ureteral guide sheath of claim 12, wherein, The power transmission member is a rotating disc, the proximal end of the pull wire is wound around the rotating disc, and the counterclockwise or clockwise rotation of the rotating disc drives the pull wire to longitudally move proximally or distally.

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