Guide sheath and ureter sheath

Abstract

The utility model relates to the technical field of ureter guiding sheaths, in particular to a guiding sheath, a ureter sheath and a guiding sheath, which comprise a sheath seat, a first through hole extending from the head end to the tail end of the sheath seat, and a second through hole extending from the head end to the tail end of the sheath seat, the sheath tube is arranged at the tail end of the sheath seat and is communicated with the first through hole; the sheath cap is provided with a second through hole and an external thread; internal threads are arranged on the wall of the first through hole in the head end of the sheath base; the sealing gasket is provided with a third through hole; when the sheath cap is installed at the head end of the sheath base in a threaded connection mode, the sealing gasket is located in the first through hole in the head end of the sheath base and is extruded and fixed through the sheath cap. And meanwhile, the first through hole, the second through hole and the third through hole are communicated. The sheath cap and the sheath base are connected through threads, and the sealing gasket is pressed through the sheath cap. The sheath cap and the sheath seat which are in threaded connection are not easy to loosen due to repeated insertion and pulling of the expansion tube, so that the sealing gasket is always pressed and fixed, and good sealing performance can be kept.

Description

TECHNICAL FIELD

[0001] The utility model relates to ureteral guide sheath technical field, concretely relates to a guide sheath and ureteral sheath. BACKGROUND

[0002] In urological surgery, ureteral guide sheath is used to establish a passage for endoscope or other instruments to enter the urinary tract. For example, when performing ureteral laser lithotripsy surgery, the endoscope is inserted from the guide sheath seat, then passes through the center hole of the sealing pad and the sheath tube to reach the diseased area, and the sealing pad in the guide sheath tightly fits the endoscope tube to achieve sealing. The endoscope performs laser lithotripsy while flushing water. The sheath seat of the guide sheath is connected to a negative pressure connection tube on one side, and the negative pressure connection tube is connected to a negative pressure source to suck out the stones.

[0003] Currently, the method for fixing the sealing pad in the existing ureteral guide sheath is that the dilator is connected to the sheath seat through a buckle to squeeze the sealing pad. For example, in the patent with the publication number CN 114451970A and the name of an improved ureteral sheath, a gland is fixedly installed in the tube segment of the sheath seat, which has an opening for the catheter to pass through, and the upper edge of the conical sealing ring is connected to the gland. The elastic ear is buckled to the buckle, and the end of the elastic ear abuts against the gland to squeeze the sealing pad.

[0004] In the above existing structure, the contact area of the buckle is small, and the buckle is also easy to slip off, which causes the sealing pad to loosen and the sealing effect to be poor. In addition, the sealing pad is pressed by the gland, the contact area between the gland and the sheath seat is small, the friction between them is also small, and the risk of the sealing pad falling off during repeated insertion and pulling of the endoscope is also relatively large. UTILITY MODEL CONTENTS

[0005] To solve the problem of poor sealing effect caused by the easy loosening of the sealing pad in the prior art, the purpose of the utility model is to provide a guide sheath and a ureteral sheath.

[0006] The technical scheme provided by the utility model is as follows:

[0007] In a first aspect, a guide sheath comprises:

[0008] a sheath seat, the sheath seat being provided with a first through hole extending from a head end to a tail end thereof;

[0009] a sheath tube, the sheath tube being installed at the tail end of the sheath seat and being in communication with the first through hole;

[0010] a sheath cap, the sheath cap being provided with a second through hole and an external thread, and the first through hole of the head end of the sheath seat being provided with an internal thread;

[0011] a sealing pad, the sealing pad being provided with a third through hole;

[0012] When the sheath cap is installed on the sheath seat head end by screw connection, the sealing gasket is located in the first through hole of the sheath seat head end and is fixed by extrusion through the sheath cap; meanwhile, the first through hole, the second through hole and the third through hole are through.

[0013] As an optional technical solution of the first aspect, the first through hole wall of the sheath seat head end is further provided with a stepped surface;

[0014] The sealing gasket is provided with a sealing gasket flange;

[0015] When the sealing gasket is placed in the first through hole of the sheath seat head end, the stepped surface is used to support the lower end surface of the sealing gasket flange, and the lower end surface of the sheath cap is used to abut against the upper end surface of the sealing gasket flange.

[0016] As an optional technical solution of the first aspect, the sheath seat outer wall is provided with a pressure measurement connection pipe and a negative pressure connection pipe;

[0017] The pressure measurement connection pipe and the negative pressure connection pipe are both through the first through hole.

[0018] Optionally, the negative pressure connection pipe is provided with an exhaust groove; a sliding cover is slidably installed at the exhaust groove;

[0019] When the sliding cover is slid, the sliding cover can adjust the opening area of the exhaust groove.

[0020] Optionally, the sheath cap outer wall is provided with a sheath cap marker line; the sheath seat outer wall is provided with a sheath seat marker line; when the sheath cap is rotated to align the sheath cap marker line with the sheath seat marker line, the sheath cap and the sheath seat are assembled in place.

[0021] Optionally, the pipe opening of the pressure measurement connection pipe is a 6% Luer inner cone joint.

[0022] Second aspect, a ureteral catheter sheath, comprising the guide sheath of the first aspect or any one of the optional technical solutions of the first aspect;

[0023] Further comprising a dilator, the dilator comprising a dilator seat and a dilator pipe fixedly connected with the dilator seat;

[0024] The dilator pipe can pass through the first through hole, the second through hole and the third through hole and extend out of the sheath pipe tail end.

[0025] As an optional technical solution of the second aspect, the dilator seat is connected with a plurality of elastic arms; the elastic arms are connected with ear hangers; the plurality of ear hangers are arranged in a ring shape;

[0026] The elastic arms are used to apply a clamping sheath action force to the ear hangers, so that the dilator seat is fixedly connected with the sheath seat.

[0027] Optionally, the head end of the sheath seat outer wall is arranged with a plurality of sheath seat anti-slip lines in a ring shape;

[0028] The anti-slip texture of the sheath seat is raised.

[0029] Furthermore, there is a gap between the anti-slip texture of the sheath seat and the end face of the sheath seat head, and this gap is equal to the thickness of the lug;

[0030] The sheath cap is provided with a sheath cap flange; when the sheath seat is held by the hook, the sheath cap flange and the anti-slip texture of the sheath seat are located on both sides of the hook, which are used to limit the displacement of the hook along the sheath seat.

[0031] Optionally, the elastic arm includes a fulcrum portion that is fixedly connected to the expander seat;

[0032] The elastic arm also includes a short arm and a long arm connected to the fulcrum; wherein the long arm extends along the head end of the ureteral sheath and the short arm extends along the tail end of the ureteral sheath.

[0033] The loop is connected to the short arm.

[0034] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0035] In this invention, the sheath cap and sheath seat are connected by threads, and the sealing gasket is pressed tightly by the sheath cap. The threaded connection between the sheath cap and sheath seat makes them less prone to loosening due to repeated insertion and pulling of the expansion tube, ensuring that the sealing gasket is always pressed and fixed, thereby maintaining good sealing performance.

[0036] The sealing gasket of this utility model is provided with a sealing gasket flange. The lower end face of the sealing gasket flange is supported by the stepped surface of the sheath seat, and the upper end face of the sealing gasket flange is abutted by the lower end face of the sheath cap. This not only facilitates the fixing of the sealing gasket, but also avoids deformation of the sealing gasket body due to compression, thereby avoiding affecting the sealing performance of the sealing gasket.

[0037] In addition, the outer wall of the sheath seat in this utility model is provided with raised anti-slip texture, and the sheath cap is provided with a sheath cap flange. The raised anti-slip texture can limit the displacement of the lug towards the tail end of the sheath seat, and the sheath cap flange can limit the displacement of the lug towards the head end of the sheath seat, thereby preventing the expander seat from slipping off the sheath seat and improving the stability of the connection between the expander seat and the sheath seat. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the ureteral sheath in one embodiment of this application;

[0039] Figure 2 This is an exploded view of the ureteral sheath in one embodiment of this application;

[0040] Figure 3 This is a schematic diagram of an elastic arm in one embodiment of this application;

[0041] Figure 4 This is a schematic diagram of the anti-slip texture of the sheath seat in one embodiment of this application;

[0042] Figure 5 This is a schematic diagram of the sheath cap in one embodiment of this application;

[0043] Figure 6 This is a schematic diagram of the sealing gasket from one perspective in one embodiment of this application;

[0044] Figure 7 This is a schematic diagram of the sealing gasket from another perspective in one embodiment of this application;

[0045] Figure 8 This is a schematic diagram showing the alignment of the sheath cap marking line and the sheath seat marking line in one embodiment of this application;

[0046] Figure 9 This is a cross-sectional view of the sheath seat, sheath cap, and sealing gasket in one embodiment of this application.

[0047] Explanation of the labels in the diagram:

[0048] Sheath seat 101, marking ring 102, pressure testing connecting tube 103, silicone cap 104, negative pressure connecting tube 105, sliding cover 106, sheath tube 107, anti-slip texture of sheath seat 108, internal thread 109, stepped surface 110, vent groove 111, marking line of sheath seat 112;

[0049] Expander base 201, expansion tube 202, fulcrum 203, elastic arm 204, short arm 204-1, long arm 204-2, elastic arm anti-slip texture 204-3, hanging ear 205;

[0050] Sheath cap 301, sheath cap flange 301-1, sheath cap lower end face 301-2, external thread 302, sealing gasket 303, sealing gasket flange upper end face 303-1, sealing gasket flange lower end face 303-2, sheath cap marking line 304. Detailed Implementation

[0051] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0052] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0053] In one embodiment, the present invention provides a guiding sheath, such as Figures 1-2 As shown, the guide sheath includes a sheath base 101, a sheath tube 107, a sheath cap 301, and a sealing gasket 303. A marking ring 102 can be provided on the sheath base 101. A first through hole extending from the head end to the tail end of the sheath base 101 is provided within the sheath base 101. To facilitate the insertion and pulling of the expansion tube, the first through hole is preferably a straight hole, i.e., its central axis is a straight line. It should be noted that the first through hole can be a cylindrical hole or a frustum-shaped hole. When the first through hole is a frustum-shaped hole, its head end inner diameter is larger than its tail end inner diameter, which facilitates the insertion of the expansion tube.

[0054] The sheath tube 107 is installed at the tail end of the sheath seat 101, and the sheath tube 107 communicates with the first through hole. The sheath tube 107 can be glued to the sheath seat 101, or other connection methods in the prior art can be used, which are relatively mature in the prior art and will not be described or limited here. When connecting the sheath tube 107 to the sheath seat 101, the head end of the sheath tube 107 can be inserted into the first through hole at the tail end of the sheath seat 101, at which time the outer wall of the head end of the sheath tube 107 can be connected to the inner wall of the first through hole at the tail end of the sheath seat 101. Alternatively, the head end face of the sheath tube 107 can be directly connected to the tail end face of the sheath seat 101.

[0055] Preferably, the central axis of the sheath 107 coincides with the central axis of the first through hole, which facilitates the insertion of instruments such as expansion tubes into the sheath 107 and their protrusion from the sheath 107.

[0056] like Figure 3 As shown, the sheath cap 301 has a second through hole. When the sheath cap 301 is connected to the sheath base 101, the second through hole can communicate with the first through hole. At this time, instruments such as expansion tubes can pass through the sheath cap 301 into the first through hole and be further inserted into the sheath tube 107, and then extend out of the sheath tube 107. To facilitate the insertion and removal of instruments, when the sheath cap 301 is connected to the sheath base 101, the central axis of the second through hole coincides with the central axis of the first through hole.

[0057] To facilitate understanding whether the sheath cap 301 and the sheath seat 101 are properly assembled, a sheath cap marking line 304 can be set on the sheath cap 301 and a sheath seat marking line 112 can be set on the sheath seat 101. When the sheath cap 301 and the sheath seat 101 are connected by threads, when the sheath cap marking line 304 and the sheath seat marking line 112 are aligned, it means that the sheath cap 301 and the sheath seat 101 are properly assembled.

[0058] In a preferred embodiment, the sheath cap 301 and the sheath seat 101 are connected by threads. Specifically, the sheath cap 301 has an external thread 302, and the wall of the first through hole at the head end of the sheath seat 101 has an internal thread 109. When the sheath cap 301 and the sheath seat 101 are threaded together, when devices such as expansion tubes are inserted or pulled through the sheath cap 301, the friction between these devices and the wall of the second through hole is approximately parallel to the axial direction of the sheath cap 301. At this time, the force received by the sheath cap 301 is also basically parallel to the axial direction of the sheath cap 301. The force parallel to the axial direction of the sheath cap 301 is unlikely to cause the threaded sheath cap 301 to loosen.

[0059] When the sheath cap 301 is installed at the head end of the sheath seat 101 via a threaded connection, the sealing gasket 303 is located in the first through hole at the head end of the sheath seat 101 and is pressed and fixed by the sheath cap 301. Since the sheath cap 301 is not easy to loosen, the sheath cap 301 can always press the sealing gasket 303 tightly, which helps the sealing gasket 303 to always maintain good sealing performance.

[0060] The sealing gasket 303 is provided with a third through hole. When the sealing gasket 303 is fixed by the sheath cap 301, the first through hole, the second through hole, and the third through hole should be kept in contact. Preferably, the central axes of the first through hole, the second through hole, and the third through hole are all coincident, which is conducive to the passage of equipment such as the expansion tube 202.

[0061] The sealing gasket 303 has a third through hole with an inner diameter at one end that is larger than that at the other end, and is roughly frustum-shaped. The end with the larger inner diameter is closer to the sheath cap 301, and the end with the smaller inner diameter is closer to the sheath seat 101.

[0062] like Figure 9 As shown, the sheath cap 301 has a second through hole with an inner diameter of D2, the sheath seat 101 has an annular stepped surface 110 with an inner diameter of D1, and the sealing gasket 303 has a third through hole with an inner diameter of D3 at the larger end. Since D1, D2, and D3 are equal in size, steps can be avoided at the connection points of the holes. When the sheath cap 301 and sheath seat 101 are threaded together to fix the sealing gasket 303, the first, second, and third through holes are connected. When the expansion tube 202 is inserted, the expansion tube 202 is prevented from being blocked by steps, making insertion smoother.

[0063] To prevent the sealing gasket 303 from being deformed by the sheath cap 301 and thus affecting the sealing performance, in an optional embodiment, such as Figure 4 , 6 As shown, the wall of the first through hole at the head end of the sheath seat 101 is also provided with a stepped surface 110, and the sealing gasket 303 is provided with a sealing gasket flange. When the sealing gasket 303 is placed in the first through hole at the head end of the sheath seat 101, the lower end face 303-2 of the sealing gasket flange abuts against the stepped surface 110, and the stepped surface 110 can support the lower end face 303-2 of the sealing gasket flange. When the sheath cap 301 is threadedly connected to the sheath seat 101, the lower end face 301-2 of the sheath cap can abut against the upper end face 303-1 of the sealing gasket flange. At this time, the sealing gasket 303 is actually fixed by fixing the sealing gasket flange, and the main body of the sealing gasket 303 will not be squeezed. That is to say, the part that performs the sealing function will not be deformed by the compression of the sheath cap 301, thereby avoiding affecting the sealing performance of the sealing gasket.

[0064] It should be noted that after the sealing gasket 303 is installed, the end face of the sealing gasket flange facing the tail end of the guide sheath is the lower end face, and the end face of the sealing gasket flange facing the head end of the guide sheath is the upper end face. Similarly, the end face of the sheath cap facing the tail end of the guide sheath is the lower end face.

[0065] In order for the sealing gasket 303 to be compressed, the distance between the end face of the tightened sheath cap 301 near the tail end and the end face of the stepped surface 110 near the head end is approximately equal to the thickness of the sealing gasket flange.

[0066] As an optional implementation, the outer wall of the sheath 101 is provided with a pressure measuring connection tube 103 and a negative pressure connection tube 105, both of which communicate with the first through hole. A removable silicone cap 104 can be installed on the pressure measuring connection tube 103, which seals the opening of the pressure measuring connection tube 103 when it is closed. After removing the silicone cap 104, the opening of the pressure measuring connection tube 103 can be connected to a pressure gauge. In addition, to accommodate various sizes of pressure gauges or serve as a multi-purpose instrument connection port, the opening of the pressure measuring connection tube 103 can be configured as a standard 6% Luer tapered connector.

[0067] The negative pressure connecting pipe 105 is provided with an exhaust groove 111, on which a sliding cover 106 is installed. The connection method between the sliding cover 106 and the negative pressure connecting pipe 105 is relatively mature in the prior art and will not be described or limited here. When the sliding cover 106 is slid, the open area of ​​the exhaust groove 111 can be adjusted, that is, the opening area of ​​the exhaust groove 111 can be adjusted, thereby adjusting the flow rate of the discharged gas and realizing the adjustment of the negative pressure.

[0068] To facilitate operation, anti-slip textures can be provided on the sliding cover 106. The shape of these anti-slip textures is not limited here; for example, they can be teardrop-shaped anti-slip textures or other shapes.

[0069] This utility model also proposes a ureteral sheath, such as Figures 1-3 As shown, the device includes the guide sheath described in the above embodiments, and also includes an expander. The expander includes an expander seat 201 and an expander tube 202 fixedly connected to the expander seat 201. The connection method between the expander seat 201 and the expander tube 202 is relatively mature in the prior art and will not be described or limited here. For example, the two can be glued together. The expander tube 202 can pass through the first through hole, the second through hole, and the third through hole, and extend from the tail end of the sheath tube 107. The wall of the third through hole of the sealing gasket 303 abuts against the outer wall of the expander tube 202, thereby achieving a seal.

[0070] like Figures 1-3 As shown in the accompanying drawings, the expander seat 201 is connected to multiple elastic arms 204. The drawings show a configuration with two elastic arms 204, each connected to a lug 205 arranged in a ring. In its natural state, the outer diameter of the cavity formed by the two lugs 205 is approximately equal to the outer diameter of the sheath seat 101's head end, allowing the inner surface of the lug 205 to fit against the outer surface of the sheath seat 101. When the expander needs to be installed on the guide sheath, the expander tube 202 is passed through the second through hole, the third through hole, and the first through hole. Then, the elastic arms 204 are pressed, causing the two lugs 205 to open. When the lugs 205 are approximately aligned with the head end of the sheath seat 101, the elastic arms 204 are released. The elastic arms 204 then apply a clamping force to the lugs 205, causing the two lugs 205 to clamp the sheath seat 101, thus fixing the expander seat 201 to the sheath seat 101.

[0071] As an optional technical solution, such as Figure 4 As shown, the outer wall of the sheath seat 101 has multiple sheath seat anti-slip patterns 108 arranged in a ring at its head end. The sheath seat anti-slip patterns 108 are raised, and their height is L. The sheath seat anti-slip patterns 108 can be vertical stripes, that is, the length extension direction of the sheath seat anti-slip patterns 108 is parallel to the axial direction of the sheath seat 101.

[0072] There is a gap between the anti-slip texture 108 of the sheath seat and the end face of the sheath seat 101. This gap is denoted as H, and it is equal to the thickness of the lug 205. Figure 5As shown, the sheath cap 301 has a sheath cap flange 301-1. When the lug 205 clamps the sheath seat 101, the sheath cap flange 301-1 and the sheath seat anti-slip texture 108 are located on both sides of the lug 205, respectively, to limit the displacement of the lug 205 along the sheath seat 101. Specifically, the side of the lug 205 facing the tail end abuts against the anti-slip texture 108 of the sheath seat, while when the sheath cap 301 is tightened, the sheath cap flange 301-1 abuts against the side of the lug 205 facing the head end. At this time, the raised anti-slip texture 108 of the sheath seat can limit the displacement of the lug 205 towards the tail end of the sheath seat, and the sheath cap flange 301-1 can limit the displacement of the lug 205 towards the head end of the sheath seat, thereby preventing the expander seat 201 from slipping off the sheath seat 101 and improving the stability of the connection between the expander seat 201 and the sheath seat 101.

[0073] Regarding the shape of the elastic arm 204, as an optional embodiment, the elastic arm 204 includes a fulcrum portion 203 that is fixedly connected to the expander seat 201. Here, fixed connection means that the fulcrum portion 203 can be integrally formed with the expander seat 201, or it can be connected to the expander seat 201 by adhesive bonding or other connection methods in the prior art.

[0074] The elastic arm 204 also includes a short arm 204-1 and a long arm 204-2 connected to the fulcrum portion 203. The short arm 204-1 and long arm 204-2 can be integrally formed with the fulcrum portion 203. The long arm 204-2 extends along the head end of the ureteral sheath, and the short arm 204-1 extends along the tail end of the ureteral sheath. The length of the long arm 204-2 is greater than the length of the short arm 204-1. The lug 205 is connected to the short arm 204-1. By pinching the long arm 204-2 inward, the semi-circular lug 205 can open outward, allowing the dilator to be removed instantly. Using the fulcrum portion 203 as the fulcrum, the length of the long arm 204-2 above the fulcrum is set to be longer than the length of the short arm 204-1 below the fulcrum near the lug 205. This setting increases the lever arm distance of the upper elastic arm, thus requiring less force to remove the dilator. To facilitate smoother removal, elastic anti-slip texture 204-3 is provided on the outer surface of the long arm 204-2, such as horizontal anti-slip stripes, which can increase friction, prevent slippage, and facilitate operation.

[0075] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A guiding sheath, characterized in that, include: Sheath base (101), which has a first through hole extending from its head end to its tail end; Sheath tube (107), which is installed at the tail end of sheath seat (101) and communicates with the first through hole; Sheath cap (301), which has a second through hole and an external thread (302); the wall of the first through hole at the head end of sheath seat (101) has an internal thread (109); Sealing gasket (303), which has a third through hole; When the sheath cap (301) is installed at the head end of the sheath seat (101) via a threaded connection, the sealing gasket (303) is located in the first through hole at the head end of the sheath seat (101) and is squeezed and fixed by the sheath cap (301); at the same time, the first through hole, the second through hole, and the third through hole are connected.

2. The guiding sheath according to claim 1, characterized in that: The wall of the first through hole at the head end of the sheath (101) is also provided with a stepped surface (110); The sealing gasket (303) is provided with a sealing gasket flange; When the sealing gasket (303) is placed in the first through hole at the head end of the sheath seat (101), the stepped surface (110) is used to support the lower end face (303-2) of the sealing gasket flange, and the lower end face (301-2) of the sheath cap is used to abut against the upper end face (303-1) of the sealing gasket flange.

3. The guiding sheath according to claim 1, characterized in that: The outer wall of the sheath (101) is provided with a pressure measuring connection pipe (103) and a negative pressure connection pipe (105); Both the pressure testing connection pipe (103) and the negative pressure connection pipe (105) are connected to the first through hole.

4. The guiding sheath according to claim 3, characterized in that: The negative pressure connecting pipe (105) is provided with an exhaust groove (111); a sliding cover (106) is slidably installed at the exhaust groove (111); When the sliding cover (106) is slid, the opening area of ​​the exhaust groove (111) can be adjusted.

5. The guiding sheath according to claim 1, characterized in that: The outer wall of the sheath cap (301) is provided with a sheath cap marking line (304); the outer wall of the sheath seat (101) is provided with a sheath seat marking line (112); When the sheath cap (301) is rotated until the sheath cap marking line (304) aligns with the sheath seat marking line (112), the sheath cap (301) and the sheath seat (101) are assembled in place.

6. A ureteral sheath, characterized in that: Includes the guiding sheath as described in any one of claims 1-5; It also includes an expander, which includes an expander seat (201) and an expansion tube (202) fixedly connected to the expander seat (201); The expansion tube (202) can pass through the first through hole, the second through hole, and the third through hole, and extend from the tail end of the sheath tube (107).

7. The ureteral sheath according to claim 6, characterized in that: The expander seat (201) is connected to a plurality of elastic arms (204); the elastic arms (204) are connected to lugs (205); the plurality of lugs (205) are arranged in a ring; The elastic arm (204) is used to apply a clamping force to the lug (205) to hold the sheath seat (101), so that the expander seat (201) is fixedly connected to the sheath seat (101).

8. The ureteral sheath according to claim 7, characterized in that: The outer end of the sheath seat (101) is provided with a plurality of sheath seat anti-slip patterns (108) arranged in a ring. The anti-slip texture (108) of the sheath seat is raised.

9. The ureteral sheath according to claim 8, characterized in that: There is a gap between the anti-slip texture (108) of the sheath seat and the end face of the sheath seat (101), and this gap is equal to the thickness of the lug (205); The sheath cap (301) is provided with a sheath cap flange (301-1); when the ear (205) clamps the sheath seat (101), the sheath cap flange (301-1) and the sheath seat anti-slip texture (108) are located on both sides of the ear (205) to limit the displacement of the ear (205) along the sheath seat (101).

10. The ureteral sheath according to claim 7, characterized in that: The elastic arm (204) includes a fulcrum portion (203) that is fixedly connected to the expander seat (201); The elastic arm (204) also includes a short arm (204-1) and a long arm (204-2) connected to the fulcrum (203); wherein, the long arm (204-2) extends along the head end of the ureteral sheath, and the short arm (204-1) extends along the tail end of the ureteral sheath; The lug (205) is connected to the short arm (204-1).

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