Bending-adjustable ureter guiding sheath

Abstract

The utility model discloses a bending-adjustable ureter guiding sheath which comprises a bending-adjustable assembly and an expander which are communicated through a negative pressure suction seat, and a sheath tube is fixed at the tail end of the bending-adjustable assembly. The sheath tube comprises an outer liner tube, an inner liner tube sleeved in the outer liner tube, a spring sleeved between the outer liner tube and the inner liner tube, a stay wire liner tube sleeved between the inner liner tube and the spring, a metal ring fixed between the inner liner tube and the outer liner tube and a stay wire penetrating through the stay wire liner tube, one end of the stay wire is fixed on the metal ring, and the other end of the stay wire is fixed on the metal ring. The other end of the pull wire penetrates through the pull wire lining pipe and is connected to the adjustable bending assembly; the pull wire sliding block is driven to move by adjusting a rotary knob of the adjustable bending assembly, and active bending of the head end of the sheathing canal is achieved. The design solves the problem that an existing passive bending sheath depends on the bending force of an endoscope, and is high in adaptability, flexible to operate and suitable for urinary system calculus treatment. The bending effect can be achieved without the bending force of the endoscope.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to an adjustable ureteral guide sheath. Background Art

[0002] With the development of negative pressure technology and endoscope technology, their application in medical treatment is becoming more and more popular. Especially in the treatment of urinary stones, with the help of the real-time field of view of the endoscope, lithotripsy can be performed accurately. The stones broken by energy such as laser are sucked out of the body through the ureteral guide sheath with negative pressure, and finally the treatment of the disease is completed.

[0003] At present, most ureteral guide sheaths on the market are passively curved, that is, the bending of the ureteral guide sheath is driven by the bending of the endoscope. The passively curved ureteral guide sheath needs to be bent at a very large angle, especially when dealing with lower calyx stones. In order to ensure a better surgical effect, the matching endoscope also needs to have a sufficiently large bending force. However, due to the different bending forces of different endoscopes, the bending effect of the ureteral guide sheath may not be ideal. Therefore, it is necessary to provide a ureteral guide sheath that can be adjusted without the help of an endoscope. Utility Model Content

[0004] The purpose of the utility model is to provide an adjustable ureteral guide sheath, which does not need to borrow the bending force of the endoscope and can achieve the bending effect by itself, thereby solving the problem in the prior art that some endoscopes are incompatible with passive bending sheaths, resulting in poor treatment effects.

[0005] The technical solution adopted by the utility model is an adjustable ureteral guide sheath, including an adjustable bend component and a dilator connected through a negative pressure suction seat, the end of the adjustable bend component is fixed with a sheath tube; the sheath tube includes an outer lining tube, an inner lining tube sleeved in the outer lining tube, a spring sleeved between the outer lining tube and the inner lining tube, a pull-wire inner lining tube sleeved between the inner lining tube and the spring, a metal ring fixed between the inner lining tube and the outer lining tube, and a pull wire passing through the pull-wire inner lining tube, one end of the pull wire is fixed to the metal ring, and the other end passes through the pull-wire inner lining tube and is connected to the adjustable bend component; the adjustable bend component controls the bending of the sheath tube by driving the pull wire displacement; the negative pressure suction seat is sealed and connected to the adjustable bend component through a silicone ring and a joint.

[0006] The characteristics of this technical solution are also:

[0007] The outer liner is composed of a soft tube and a hard tube, and the hard tube is fixedly connected to the adjustable bend component; a spring is attached to the surface of the inner liner, and a metal ring is fixed at one end of the spring away from the adjustable bend component, and the spring extends to 2-8mm away from the inner liner port away from the metal ring.

[0008] The axial length of the metal ring is 1.5-4 mm, and the distance between the metal ring and the soft tube port away from the hard tube is 1-4 mm.

[0009] A wire lining tube is arranged between the spring and the inner lining tube. The wire is inserted into the wire lining tube. One end of the wire is fixed to the metal ring. The other end of the wire is led out through the wire side outlet on the hard tube. The wire side outlet is 20 to 40 mm away from the end of the inner lining tube away from the metal ring.

[0010] The lining tube and the pull wire are made of PTFE, the spring, metal ring and pull wire are made of stainless steel, and the soft tube and the hard tube are made of polymer material.

[0011] The soft pipe and the hard pipe are made of one or more materials selected from polyurethane, polyether block polyamide and nylon.

[0012] The hardness range of soft pipe is 70A-50D, and the length is 45-65mm; the hardness range of hard pipe is 61D-70D.

[0013] The surface of the hard tube is provided with scale marks for indicating the length from the head end of the sheath tube; the surface of the hard tube is provided with bending direction indicator marks for indicating the real-time bending direction of the sheath tube.

[0014] The adjustable bending assembly consists of a crimping tube, a wire pull slider, a knob, a sheath, a limit cap, a washer, a sliding rod and a limit washer; a wire pull insertion cavity is opened on the wire pull slider, the wire pull passes through the wire pull insertion cavity, the wire pull and the crimping tube form a wire pull assembly block, the wire pull assembly block is fixed in the wire pull assembly fixing cavity, the end of the sheath away from the metal ring passes into the sheath fixing cavity and is fixed at the connection between the sheath and the adjustable bending assembly; a limit washer is sleeved on the sliding rod, the limit washer cavity is aligned with the protrusion of the sliding rod and is inserted, the limit end face of the limit washer determines the moving distance of the wire pull slider, thereby determining the bending angle of the adjustable ureteral guide sheath; the wire pull slider is inserted into the sliding rod, wherein the top of the wire pull slider is aligned with the sliding rod groove, so that the top of the wire pull slider can only move along the sliding rod groove; the knob is screwed into the wire pull slider through the knob thread and the wire pull slider thread until it presses against the sliding rod.

[0015] The limit cap inserted into the washer is locked with the sliding rod through the sliding rod thread and the inner thread of the limit cap, wherein the knob rotates through the sliding surface of the limit cap and the outer surface of the maximum diameter of the limit washer, and is limited by the sliding rod and the washer to ensure that the knob can only rotate 360° in a circumferential direction and cannot move forward and backward.

[0016] A sheath is sleeved on the limit cap and the knob, the long sheath card surface of the sheath is aligned and contacted with the long sheath card surface of the limit cap, the short sheath card surface of the sheath is aligned and contacted with the short sheath card surface of the limit cap, and the sheath oblique card surface of the sheath is fixed with the knob card surface of the knob.

[0017] The surface of the knob is provided with a knob grip and a rotation indicator block. The knob grip is used to increase friction and facilitate rotation operation; the rotation indicator block is used to indicate the rotation direction of the knob.

[0018] The negative pressure suction seat includes a Y-shaped negative pressure head, a negative pressure connector of the Y-shaped negative pressure head is connected to an external negative pressure source, one end of the Y-shaped negative pressure head is sealed by a silicone sealing cap, and the other end opposite to the silicone sealing cap is connected to an adjustable bending component through a silicone ring and a connector, and a negative pressure regulating valve for adjusting the strength of the negative pressure attraction force is arranged on the Y-shaped negative pressure head.

[0019] A small hole is opened on the silicone sealing cap, and the negative pressure regulating valve can slide to adjust the strength of the negative pressure attraction force by covering the open groove on the Y-shaped negative pressure head. The external negative pressure source is connected to the negative pressure joint, and the negative pressure attraction seat is inserted into the sliding rod joint cavity through the silicone ring and the joint interference fit to form a sealed connection between the adjustable bending component and the negative pressure attraction seat.

[0020] The expander includes an expander tube, on which an expander joint and an expander fixing head are sleeved; the expander tube is inserted through a small hole on a silicone sealing cap until the expander fixing head slot is engaged with a clamping ring; the expander joint can be rotated 360° through the clamping connection with the expander fixing head.

[0021] The utility model discloses an adjustable ureteral guide sheath, including a sheath, an adjustable bend component, a dilator and a negative pressure suction seat. The active bending of the sheath head end is achieved by adjusting the knob of the adjustable bend component to drive the pull wire slider to move. The negative pressure suction seat is sealed and connected with the adjustable bend component through interference fit with the silicone ring and the joint, supporting negative pressure suction and rotation adjustment during surgery. The adjustable bend component can rotate 360° around the silicone ring and the joint, thereby driving the curved sheath to achieve 360° circumferential rotation. This design solves the problem of existing passive bending sheaths relying on the bending force of the endoscope, has strong adaptability, flexible operation, and is suitable for the treatment of urinary stones. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the adjustable ureteral guide sheath of the utility model;

[0023] Figure 2 It is a cross-sectional schematic diagram of the adjustable ureteral guide sheath of the utility model;

[0024] Figure 3 It is a schematic diagram of the structure of the sheath tube;

[0025] Figure 4 It is a cross-sectional schematic diagram of the sheath tube portion;

[0026] Figure 5 It is a structural schematic diagram of an adjustable bending component;

[0027] Figure 6It is a structural schematic diagram of a wire pull slider;

[0028] Figure 7 It is a cross-sectional schematic diagram of a wire pull slider;

[0029] Figure 8 It is a structural diagram of the knob part;

[0030] Fig. 9 It is a cross-sectional schematic diagram of the knob part;

[0031] Fig.10 It is a schematic diagram of the structure of the sheath part;

[0032] Fig.11 It is a structural schematic diagram of the limiting cap part;

[0033] Fig.12 It is a structural schematic diagram of the sliding rod part;

[0034] Fig.13 is a cross-sectional schematic diagram of the sliding rod portion;

[0035] Fig.14 It is a structural schematic diagram of the limiting washer part;

[0036] Fig.15 It is a structural schematic diagram of the expander part;

[0037] Fig.16 It is a schematic diagram of the structure of the negative pressure suction seat.

[0038] In the figure, 1 is a sheath tube; 2 is an adjustable bend assembly; 3 is a dilator; 4 is a negative pressure suction seat; 100 is an adjustable bend ureteral guide sheath; 101 is a pull wire assembly block; 102 is a pull wire side outlet; 103 is a sealed connection between the adjustable bend assembly and the negative pressure suction seat; 104 is a connection between the sheath tube and the adjustable bend assembly; 11 is a pull wire; 12 is a spring; 13 is a metal ring; 14 is a scale mark; 15 is a bending direction indicator mark ; 16 is a soft tube; 17 is a hard tube; 18 is a liner tube; 19 is a wire liner tube; 21 is a crimping tube; 22 is a wire slider; 23 is a knob; 24 is a sheath; 25 is a limit cap; 26 is a washer; 27 is a slide bar; 28 is a limit washer; 221 is a top of the wire slider; 222 is a fixing cavity for the wire assembly; 223 is a thread of the wire slider; 224 is a wire insertion cavity; 231 is a knob grip point; 232 is a rotation indicator block; 233 is a knob surface; 234 is a knob thread; 241 is a long sheath surface; 242 is a short sheath surface; 243 is an oblique sheath surface; 251 is a long limit cap surface; 252 is a short limit cap surface; 253 is a limit cap internal thread; 254 is a limit cap sliding surface; 271 is a slide rod joint protrusion; 272 is a slide rod joint cavity; 273 is a sheath tube fixing cavity; 274 is a slide rod Thread; 275 is the slide bar groove; 276 is the slide bar protrusion; 281 is the limit washer cavity; 282 is the limit end face; 31 is the expander joint; 32 is the expander fixed head; 33 is the expander tube; 321 is the expander fixed head groove; 41 is the silicone plugging cap; 42 is the negative pressure regulating valve; 43 is the Y-type negative pressure head; 431 is the negative pressure joint; 432 is the clamping ring; 433 is the joint; 44 is the silicone ring. DETAILED DESCRIPTION

[0039] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0040] The utility model provides an adjustable ureteral guide sheath which is an active bending guide sheath and can achieve flexible bending in multiple directions without relying on external equipment, thereby solving the compatibility and operation limitations of passive bending sheaths.

[0041] like Figure 1-16 As shown, an adjustable ureteral guide sheath mainly includes four parts: a sheath tube 1, an adjustable bend component 2, a dilator 3, and a negative pressure suction seat 4. The details are as follows:

[0042] The sheath tube 1 is composed of a pull wire 11, a spring 12, a metal ring 13, a scale mark 14, a bending direction indicator mark 15, a soft tube 16, a hard tube 17, an inner lining tube 18, and a pull wire inner lining tube 19; further, the inner lining tube 18 is located in the innermost layer of the sheath tube 1, and the inner lining tube 18 is made of PTFE. The spring 12 and the metal ring 13 are attached to the surface of the inner lining tube 18. The metal ring 13 is 1-4 mm away from the end of the soft tube 16 away from the hard tube 17, and the other end is in contact with the spring 12. The length of the metal ring itself is about 1.5-4 mm. One end of the spring 12 is in contact with the metal ring 13, and the other end is about 2-8 mm away from the end of the inner lining tube 18 away from the metal ring 13. The spring 12 and the metal ring 13 are made of stainless steel; the pull wire inner lining tube 19 is between the spring 12 and the inner lining tube 18, and is made of PTFE. The pull wire 11 is made of stainless steel, and one end is fixed to the metal ring 1 by a welding process. 3, the other end is inserted into the wire liner tube 19 until it is 20 to 40 mm away from the end of the inner liner tube 18 away from the metal ring, and the wire 11 is led out through the wire side outlet 102. The soft tube 16 and the hard tube 17 are made of polymer materials, such as polyurethane, polyether block polyamide, nylon and other materials. They are coated on the inner liner tube 18, the wire liner tube 19, the metal ring 13, and the spring 12 through a thermal rheological process to fix several modules. Since the wire 11 is in the wire liner tube 19, it is not coated and fixed and can be stretched. The hardness range of the soft tube 16 material is 70A to 50D, and the length is about 45 to 65mm. The hardness range of the hard tube 17 material is 61D to 70D. A scale mark 14 is printed on the surface of the hard tube 17 to indicate the length from the head end of the sheath tube, and a bending direction indicator mark 15 is printed on the surface of the hard tube 17 to indicate the bending direction of the sheath tube.

[0043] As shown in the figure, the adjustable bending assembly 2 is composed of a crimping tube 21, a wire pull slider 22, a knob 23, a sheath 24, a limit cap 25, a washer 26, a slide rod 27 and a limit washer 28;

[0044] The pull wire 11 passes through the pull wire insertion cavity 224 and is fixed to the crimping tube 21 by physical crimping to form a pull wire assembly block 101. The pull wire assembly block 101 is fixed to the pull wire assembly fixing cavity 222 by welding or gluing. At the same time, the end of the sheath tube 1 away from the metal ring 13 is passed through the sheath tube fixing cavity 273 of the slide bar 27, and the sheath tube is fixed to the sheath tube fixing cavity 273 of the slide bar 27 by gluing to form a connection 104 between the sheath tube and the adjustable bending component.

[0045] The limiting washer 28 is inserted into the slide bar 27, wherein the limiting washer cavity 281 is aligned with the slide bar protrusion 276 and inserted therein, and the limiting end surface 282 of the limiting washer 28 determines the moving distance of the wire slider 22, thereby determining the bending angle of the adjustable ureteral guide sheath;

[0046] Insert the wire pull slider 22 after fixing the wire pull assembly block 101 into the slide bar 27, wherein the top 221 of the wire pull slider is aligned with the slide bar groove 275, so that the top 221 of the wire pull slider can only move forward and backward along the slide bar groove 275;

[0047] The knob 23 is screwed into the cable slider 22 through the knob thread 234 and the cable slider thread 223 until it contacts the slide bar 27. The knob 23 has a knob grip 231 and a rotation indicator block 232 on its surface. The knob grip is convenient for rotation, and the rotation indicator block indicates the rotation direction of the knob.

[0048] The limiting cap 25 inserted into the washer 26 is locked with the slide bar 27 through the slide bar thread 274 and the limiting cap internal thread 253, wherein the knob 23 rotates through the limiting cap sliding surface 254 and the outer surface of the maximum diameter of the limiting washer 28, and is limited by the slide bar 27 and the washer 26, ensuring that the knob 23 can only rotate 360° in the circumferential direction and cannot move forward and backward;

[0049] The sheath 24 is inserted into the limiting cap 25 and the knob 23, the long sheath clamping surface 241 of the sheath 24 is aligned and contacted with the long sheath clamping surface 251 of the limiting cap 25, the short sheath clamping surface 242 of the sheath 24 is aligned and contacted with the short sheath clamping surface 252 of the limiting cap 25, and the sheath oblique clamping surface 243 of the sheath 24 is fixed to the knob clamping surface 233 of the knob 23 by adhesive contact;

[0050] As shown in the figure, the dilator 3 is composed of a dilator joint 31, a dilator fixing head 32, and a dilator tube 33. The negative pressure suction seat 4 is composed of a silicone plugging cap 41, a negative pressure regulating valve 42, a Y-shaped negative pressure head 43, and a silicone sleeve ring 44.

[0051] There is a small hole on the silicone sealing cap 41, and the negative pressure regulating valve 42 can slide to adjust the strength of the negative pressure attraction force by covering the open groove on the Y-shaped negative pressure head 43. The external negative pressure source is connected to the negative pressure joint 431, and the negative pressure suction seat 4 is inserted into the sliding rod joint cavity 272 through the silicone ring 44 and the joint 433 to form a sealed connection 103 between the adjustable bend component and the negative pressure suction seat. One of the important functions of the sealed connection 103 between the adjustable bend component and the negative pressure suction seat is to enable the adjustable bend component 2 to rotate 360° circumferentially along the negative pressure suction seat 4 through the silicone ring 44 and the joint 433. Since the adjustable ureteral guide sheath in this article is unidirectionally adjustable, if bending treatment in other directions is required during the operation, the parts sheath 24 and the negative pressure suction seat 4 of the adjustable bending component 2 can be held, and then the sheath 24 can be rotated to achieve a 360° circumferential rotation of the adjustable bending component 2 of the fixed sheath tube 1, thereby realizing the actual bending function in all directions. The function of the slide rod joint protrusion 271 is to prevent the negative pressure suction seat 4 from detaching from the slide rod 27.

[0052] The expander 3 is inserted through the small hole on the silicone plugging cap 41 until the expander fixing head slot 321 is clamped into the clamping ring 432; the expander joint 31 can be rotated 360 degrees through the clamping joint with the expander fixing head 32, which can better guide the product to pass through the narrow part of the patient;

[0053] The adjustable ureteral guide sheath of the utility model can be rotated by the rotating knob 23. Since the knob 23 is limited by the slide rod 27 and the washer 26, the knob 23 can only be rotated 360° circumferentially through the limiting cap sliding surface 254 and the outer surface of the maximum diameter of the limiting washer 28, and cannot move forward and backward.

[0054] At the same time, since the knob thread 234 of the knob 23 and the wire slider thread 223 of the wire slider 22 match each other, when the knob 23 only rotates 360° circumferentially, the wire slider 22 will slide along the slide bar 27. Since the top 221 of the wire slider is aligned with the slide bar groove 275, the wire slider does not rotate axially, and the top 221 of the wire slider can only move forward and backward along the slide bar groove 275, thereby driving the wire 11 to move forward and backward. Since the wire 11 and the crimping tube 21 are fixed by physical crimping to form the wire assembly block 101, and the wire assembly block 101 is fixed to the wire assembly fixed cavity 222 by welding or gluing, the wire 11 will move forward and backward with the wire slider.

[0055] When the pull wire 11 moves backward, since the sheath 1 has been fixed to the sheath fixing cavity 273 of the slide rod 27, and one end of the pull wire 11 is fixed to the metal ring 13 through a welding process, it will cause the soft tube 16 of the sheath 1 to bend, thereby realizing the adjustable bending function. At the same time, since the soft tube 16 contains a spring 12, the soft tube 16 will not bend when it bends.

[0056] In addition, the sheath tube 1 is provided with a scale mark 14 to remind the operator of the length of the sheath tube 1 entering the human body, and the sheath tube 1 is provided with a bending direction indicator mark 15 to remind the operator that the bending direction can be adjusted when bending to prevent adjustment to an unwanted direction; at the same time, the knob 23 is provided with a knob grip point 231, which mainly plays a role in preventing slipping when rotating the knob, and the knob 23 is provided with a rotation indicator block 232 to remind the operator of the rotation direction of the knob 23 when bending the sheath tube 1;

[0057] The negative pressure suction seat 4 is interference-inserted into the sliding rod joint cavity 272 through the silicone ring 44 and the joint 433 to form a sealed connection 103 between the adjustable bend component and the negative pressure suction seat. One of the important functions of the sealed connection 103 between the adjustable bend component and the negative pressure suction seat is to enable the adjustable bend component 2 to rotate 360° circumferentially along the negative pressure suction seat 4 through the silicone ring 44 and the joint 433.

[0058] Since the adjustable ureteral guide sheath in this article is unidirectionally adjustable, if bending treatment in other directions is required during the operation, the parts sheath 24 and the negative pressure suction seat 4 of the adjustable bending component 2 can be held, and then the sheath 24 can be rotated to achieve a 360° circumferential rotation of the adjustable bending component 2 of the fixed sheath tube 1, thereby realizing the actual bending function in all directions.

[0059] The function of the slide rod joint protrusion 271 is to prevent the negative pressure suction seat 4 from being separated from the slide rod 27. The silicone sleeve ring 44 also plays a role in maintaining air tightness, so that when negative pressure suction is performed during surgery, no leakage occurs at the sealing connection 103 between the adjustable bending component and the negative pressure suction seat. The negative pressure regulating valve 42 can slide to adjust the strength of the negative pressure attraction force by covering the open groove on the Y-shaped negative pressure head 43. The external negative pressure source is connected to the negative pressure joint 431.

[0060] The expander 3 is inserted through the small hole on the silicone sealing cap 41 until the expander fixing head slot 321 is engaged with the clamping ring 432. At this time, the expander 3 can be fixed on the negative pressure suction seat 4. At the same time, the expander connector 31 can be rotated 360° through the clamping joint with the expander fixing head 32, which can better guide the product through the patient's narrow part during the operation.

Claims

1. An adjustable ureteral guide sheath, characterized in that: The invention comprises an adjustable bending component (2) and a dilator (3) connected through a negative pressure suction seat (4), wherein a sheath tube (1) is fixed at the end of the adjustable bending component (2); the sheath tube (1) comprises an outer lining tube, an inner lining tube (18) sleeved in the outer lining tube, a spring (12) sleeved between the outer lining tube and the inner lining tube (18), a pull-wire inner lining tube (19) sleeved between the inner lining tube (18) and the spring (12), a metal ring (13) fixed between the inner lining tube (18) and the outer lining tube, and a pull-wire (11) passing through the pull-wire inner lining tube, wherein one end of the pull-wire (11) is fixed to the metal ring, and the other end passes through the pull-wire inner lining tube (19) and is connected to the adjustable bending component; the adjustable bending component controls the bending of the sheath tube by driving the displacement of the pull-wire; the negative pressure suction seat (4) is sealed and connected to the adjustable bending component (2) through a silicone sleeve ring (44) and a joint (433).

2. The adjustable ureteral guide sheath according to claim 1, characterized in that: The outer lining tube is composed of a soft tube (16) and a hard tube (17) spliced ​​together, and the hard tube (17) is fixedly connected to the adjustable bending component (2); a metal ring (13) is fixed to the end of the spring (12) away from the adjustable bending component (2), and the spring (12) extends to a distance of 2-8 mm from the end of the inner lining tube (18) away from the metal ring (13).

3. The adjustable ureteral guide sheath according to claim 2, characterized in that: A wire lining tube (19) is provided between the spring (12) and the inner lining tube (18), the wire lining tube (19) is inserted into the wire lining tube (19), one end of the wire lining tube (11) is fixed to the metal ring (13), and the other end of the wire lining tube (11) is led out through a wire side outlet (102) on the hard tube (17), and the wire side outlet (102) is 20 to 40 mm away from one end of the inner lining tube (18) away from the metal ring (13).

4. The adjustable ureteral guide sheath according to claim 3, characterized in that: The inner lining tube (18) and the pull wire inner lining tube (19) are made of PTFE material, the spring (12), the metal ring (13) and the pull wire (11) are all made of stainless steel, and the soft tube (16) and the hard tube (17) are made of polymer material.

5. The adjustable ureteral guide sheath according to claim 2, characterized in that: The adjustable bending component (2) is composed of a crimping tube (21), a wire pull slider (22), a knob (23), a sheath (24), a limit cap (25), a washer (26), a slide rod (27) and a limit washer (28); the wire pull slider (22) is provided with a wire pull insertion cavity (224), the wire pull (11) passes through the wire pull insertion cavity (224), and the wire pull (11) and the crimping tube (21) are in a closed relationship. The pull-wire assembly (101) is fixed to the pull-wire assembly fixing cavity (222), and the end of the sheath tube (1) away from the metal ring (13) is inserted into the sheath tube fixing cavity (273) and fixed to the connection point (104) between the sheath tube and the adjustable bending component; a limiting washer (28) is sleeved on the slide bar (27), and the limiting washer cavity (281) is aligned with the slide bar protrusion (276) and sleeved therein, and the limiting The limiting end surface (282) of the gasket (28) determines the moving distance of the wire pull slider (22), thereby determining the bending angle of the adjustable ureteral guide sheath; the wire pull slider (22) is inserted into the slide bar (27), wherein the top head (221) of the wire pull slider is aligned with the slide bar groove (275), so that the top head (221) of the wire pull slider can only move along the slide bar groove (275); the knob (23) is connected to the pull slider through the knob thread (234). The thread (223) of the wire slider is screwed into the wire pull slider until it presses against the slide bar (27); the limiting cap (25) inserted into the washer (26) is locked with the slide bar (27) through the slide bar thread (274) and the limiting cap internal thread (253), wherein the knob (23) is rotated through the limiting cap sliding surface (254) and the outer surface of the maximum diameter of the limiting washer (28), and is limited by the slide bar (27) and the washer (26).

6. The adjustable ureteral guide sheath according to claim 5, characterized in that: A sheath (24) is sleeved on the limiting cap (25) and the knob (23); a long sheath clamping surface (241) of the sheath (24) is aligned and in contact with a long sheath clamping surface (251) of the limiting cap (25); a short sheath clamping surface (242) of the sheath (24) is aligned and in contact with a short sheath clamping surface (252) of the limiting cap (25); and a sheath oblique clamping surface (243) of the sheath (24) is fixed to a knob clamping surface (233) of the knob (23).

7. The adjustable ureteral guide sheath according to claim 5, characterized in that: The surface of the knob (23) is provided with a knob gripping point (231) and a rotation indicating block (232); the knob gripping point (231) is used to increase friction and facilitate rotation operation; the rotation indicating block (232) is used to indicate the rotation direction of the knob.

8. The adjustable ureteral guide sheath according to claim 5, characterized in that: The negative pressure suction seat (4) comprises a Y-shaped negative pressure head (43), a negative pressure connector (431) of the Y-shaped negative pressure head (43) being connected to an external negative pressure source, one end of the Y-shaped negative pressure head (43) being sealed by a silicone sealing cap (41), and the other end opposite to the silicone sealing cap (41) being connected to the adjustable bending component (2) by interference fit through a silicone sleeve ring (44) and a connector (433), the adjustable bending component (2) being able to rotate 360° around the silicone sleeve ring (44) and the connector (433), and a negative pressure regulating valve (42) for adjusting the strength of the negative pressure attraction force being arranged on the Y-shaped negative pressure head (43).

9. The adjustable ureteral guide sheath according to claim 1, characterized in that: The dilator (3) comprises a dilator tube (33), on which a dilator joint (31) and a dilator fixing head (32) are sleeved; the dilator tube (33) is inserted through a small hole on a silicone plugging cap (41) until the dilator fixing head clamping groove (321) is clamped into a clamping ring (432); the dilator joint (31) can be rotated 360 degrees through the clamping joint with the dilator fixing head (32).

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