A ureteral sheath

Abstract

The present invention relates to the technical field of medical devices, and specifically discloses a ureteral sheath, which comprises a sheath body and a diaphragm. The sheath body is provided with a surgical channel, two diaphragms are arranged in the surgical channel, and the two diaphragms are distributed on both sides of a first radial direction to separate the surgical channel into an instrument channel and two perfusion channels. The diaphragm is configured to switch from a closed state to an open state when the perfusion channel is filled with perfusion liquid. In the closed state, the diaphragm is attached to the inner wall of the sheath body. In the open state, the two diaphragms separate the instrument channel into a first area and a second area distributed along the first radial direction. When perfusing liquid, the perfusion liquid in the perfusion channel can prop up the diaphragm to put the diaphragm in an open state. The two diaphragms can abut against the insertion part of the endoscope in the surgical channel and confine it within the first area. At this time, the channel size of the second area is larger, which is conducive to the smooth discharge of waste such as gravel.

Description

Technical Field

[0001] The invention relates to the technical field of endoscopes, and in particular to a ureteral sheath. Background Art

[0002] Ureteral sheaths are used in urological surgery. Before clinical urological surgery, a ureteral sheath must be inserted into the ureter to establish a surgical channel. During the operation, an endoscope, laser fiber, stone removal instrument or operating cable is introduced through the surgical channel.

[0003] In the related art, the ureteral sheath usually has a perfusion function. The perfusion function of the ureteral sheath not only makes the surgical field of view clearer and provides good operating conditions for doctors, but also helps to flush out waste generated by the operation, such as gravel, blood clots, and purulent flocs, and promotes the smooth progress of the operation. The flushed waste, such as gravel, blood clots, and purulent flocs, can be discharged through the ureteral sheath by negative pressure suction. However, when the ureteral sheath in the related art is subjected to negative pressure suction, gravel often gets stuck in the ureteral sheath, that is, the permeability of the ureteral sheath is poor, which affects the normal progress of the surgical operation and increases the difficulty and risk of the operation. Summary of the invention

[0004] The invention discloses a ureteral sheath to solve the technical problem of poor lithotripsy of the ureteral sheath during negative pressure suction in the related art.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] The present application provides a ureteral sheath, which includes a sheath body and a diaphragm, wherein the sheath body is provided with a surgical channel, and two diaphragms are provided in the surgical channel, and the two diaphragms are distributed on both sides of a first radial direction to separate the surgical channel into an instrument channel and two perfusion channels. The diaphragm has a closed state and an open state, and in the closed state, the diaphragm is attached to the inner wall of the sheath body, and the diaphragm is configured to switch from the closed state to the open state when the perfusion channel is filled with perfusion fluid, and in the open state, the two diaphragms separate the instrument channel into a first area and a second area distributed along the first radial direction.

[0007] Furthermore, the diaphragm has a closed state and an open state. In the closed state, the diaphragm is attached to the inner wall of the sheath body. The diaphragm is configured to switch from the closed state to the open state when the perfusion channel is filled with perfusion fluid, and in the open state, the two diaphragms separate the instrument channel into a first area and a second area distributed along a first radial direction.

[0008] Furthermore, the diaphragm includes a first diaphragm segment and a second diaphragm segment. In the closed state, along the circumferential direction of the sheath body, the second diaphragm segment is partially overlapped with the first diaphragm segment.

[0009] Furthermore, the first diaphragm segment includes a first part and a second part distributed along the circumference of the sheath body, wherein the first part is connected to the inner wall of the sheath body, the second part is connected to the second diaphragm segment and overlapped, and the thickness of the second part is less than the thickness of the first part.

[0010] Further, a connection between the first portion and the sheath body is offset to a second side in the second radial direction.

[0011] Further, an extension length of the second portion is smaller than an extension length of the first portion.

[0012] Furthermore, in the open state, the first diaphragm segment is recessed toward the inner wall of the sheath body to form an arc-shaped structure.

[0013] Further, the distal end of the perfusion channel passes through the sheath body; or, the distal end of the perfusion channel is closed, and a liquid outlet hole communicating with the perfusion channel is provided on the distal side wall of the sheath body.

[0014] Furthermore, the ureteral sheath also includes a conductive piece, and a liquid inlet hole connected to the perfusion channel is also provided on the proximal side wall of the sheath body. The conductive piece is sleeved on the proximal end of the sheath body and corresponds to the liquid inlet hole. The conductive piece is provided with a conductive cavity extending along its circumference, and the conductive cavity conducts the two liquid inlet holes.

[0015] Furthermore, the ureteral sheath also includes a sheath seat, the conductive component is arranged in the sheath seat, and the sheath seat is provided with an irrigation nozzle connected with the conductive cavity.

[0016] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0017] The ureteral sheath of the present application, when the perfusion operation is performed, the perfusion liquid can fill the perfusion channel and expand the diaphragm to an open state. At this time, the diaphragms arranged on both sides of the first radial direction can jointly push the insertion part of the endoscope, so that the insertion part is close to the inner wall of the surgical channel at one end of the first radial direction, that is, the insertion part is located in the aforementioned first area, and the gap size of the second area in the first radial direction is the largest at this time. That is to say, when the insertion part is inserted into the surgical channel, the insertion part is biased to one end of the first radial direction through the joint abutment of the two diaphragms in the open state, so that the surgical channel can maximally vacate a gap area for waste such as gravel to pass through at the other end of the first radial direction, thereby improving the passability of waste such as gravel, ensuring the normal progress of the surgical operation, and reducing the difficulty and risk of the hands. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is one of the structural schematic diagrams of the ureteral sheath of the embodiment of the present application;

[0020] Figure 2 yes Figure 1 A local enlarged schematic diagram of the middle A;

[0021] Figure 3 is a schematic structural diagram of the diaphragm in an open state according to an embodiment of the present application;

[0022] Figure 4 is a schematic diagram of the ureteral sheath of an embodiment of the present application being placed into the insertion portion when the diaphragm is in a closed state;

[0023] Figure 5 is a schematic diagram of the ureteral sheath of an embodiment of the present application being placed into the insertion portion when the diaphragm is in an open state;

[0024] Figure 6 This is the second structural schematic diagram of the ureteral sheath of the embodiment of the present application;

[0025] Figure 7 yes Figure 6 A local enlarged schematic diagram of point B in the middle.

[0026] In the figure:

[0027] 100, sheath body; 110, surgical channel; 111, instrument channel; 111a, first area; 111b, second area; 112, perfusion channel; 120, liquid inlet; 130, liquid outlet; 200, diaphragm; 210, first diaphragm segment; 211, first part; 212, second part; 220, second diaphragm segment; 300, conductive part; 310, conductive cavity; 400, sheath seat; 410, perfusion nozzle; 420-negative pressure nozzle. DETAILED DESCRIPTION

[0028] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0029] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0030] The following is combined with Figures 1 to 7 , the ureteral sheath provided in the embodiment of the present application is described in detail through specific embodiments and their application scenarios.

[0031] See also Figure 1 to Figure 7 The embodiment of the present application discloses a ureteral sheath, which includes a sheath body 100 and a diaphragm 200, wherein the sheath body 100 is a basic component of the ureteral sheath and can provide an installation foundation for the diaphragm 200. Specifically, the sheath body 100 has a surgical channel 110, which exemplarily runs through the sheath body 100 along the extension direction of the sheath body 100. During the operation, the insertion portion of the endoscope, the laser optical fiber, and the stone removal instrument can be inserted into the patient's body through the surgical channel 110.

[0032] In an embodiment of the present application, two diaphragms 200 are arranged in the surgical channel 110 and connected to the inner wall of the sheath body 100. For example, the diaphragm 200 can be connected and fixed to the inner wall of the sheath body 100 by gluing, welding, etc. The two diaphragms 200 separate the surgical channel 110 into an instrument channel 111 and two perfusion channels 112, wherein each perfusion channel 112 is formed by a separate diaphragm 200 and the inner wall of the sheath body 100, and the formed perfusion channel 112 is distributed on one side of the diaphragm 200, and the instrument channel 111 is formed by the two diaphragms 200 and the inner wall of the sheath body 100, and the formed instrument channel 111 is distributed on the other side of the diaphragm 200, that is, the other side of the diaphragm 200 constitutes the inner wall surface of the instrument channel 111.

[0033] In the examples of this application, see Figure 3 , Figure 3 The direction a is a first radial direction, and the two perfusion channels 112 are distributed on both sides of the first radial direction. Exemplarily, the two perfusion channels 112 may be symmetrically distributed on both sides of the first radial direction.

[0034] In the embodiment of the present application, the diaphragm 200 may be a sheet-like structure made of a flexible elastic material. For example, the diaphragm 200 may be a rubber membrane or a silicone rubber membrane, which has a certain degree of flexible deformation capability. Figure 3 , Figure 4 and Figure 5 The diaphragm 200 has a closed state and an open state in the surgical channel 110. In the closed state, that is, when there is no perfusion fluid in the perfusion channel 112, the diaphragm 200 is attached to the inner wall of the sheath body 100; the diaphragm 200 is configured to deform when the perfusion channel 112 is filled with perfusion fluid, and switches from a closed state to an open state. In the open state, the diaphragm 200 is separated from the inner wall of the sheath body 100 and forms a larger flow aperture to ensure the perfusion flow of the perfusion fluid.

[0035] In the embodiment of the present application, when the two diaphragms 200 are in an open state, the two diaphragms 200 separate the instrument channel 111 into a first area 111a and a second area 111b distributed along a first radial direction. It can be understood that based on the inward invasion and deformation of the diaphragm 200 in the open state in the surgical channel 110, when the insertion portion of an endoscope is inserted into the surgical channel 110 and the two diaphragms 200 are in an open state, the two diaphragms 200 can jointly abut the insertion portion to make it deviate from the middle position of the sheath body 100, and make the insertion portion abut against the inner wall of the sheath body 100.

[0036] It should be noted that the definition of the first area 111a and the second area 111b in the embodiment of the present application means that when the two diaphragms 200 are in an open state, the area of ​​the instrument channel 111 used to accommodate the insertion part is the first area 111a, and the area of ​​the instrument channel 111 not used to accommodate the endoscope is the second area 111b, and the diaphragm 200 does not play an obvious physical separation role between the first area 111a and the second area 111b. When the diaphragm 200 is in a closed state, part of the insertion part can still be located in the second area 111b.

[0037] Based on the above technical solution, the ureteral sheath of the embodiment of the present application is used in specific applications. Figure 2 , Figure 4 and Figure 5 When the perfusion operation is required, for example, to clean the surgical field or flush out the gravel in the patient's body, the perfusion liquid can fill the perfusion channel 112 and expand the diaphragm 200 to an open state. At this time, the diaphragms 200 arranged on both sides of the first radial direction can jointly push the insertion part of the endoscope, so that the insertion part is close to the inner wall of the surgical channel 110 at one end of the first radial direction, that is, the insertion part is located in the aforementioned first area 111a, and the gap size of the second area 111b in the first radial direction is the largest. In other words, when the insertion part is inserted into the surgical channel 110, the insertion part is biased to one end of the first radial direction through the common abutment of the two diaphragms 200 in the open state, so that the surgical channel 110 can maximally vacate a gap area for waste such as gravel to pass through at the other end of the first radial direction, thereby improving the passability of waste such as gravel, ensuring the normal progress of the surgical operation, and reducing the difficulty and risk of the operation.

[0038] During the research process, the inventors found that in order to reduce the risk of surgical operations, the radial size of the sheath body 100 is usually controlled to be smaller to reduce the risk of ureteral wall damage. That is to say, the radial space occupied by the surgical channel 110 of the sheath body 100 is limited. In order to rationally utilize the limited radial space of the surgical channel 110 and ensure that the endoscope used with the ureteral sheath has sufficient radial space to meet functions such as clear photography and insertion of treatment instruments, the diameter of the insertion portion of the endoscope used with the ureteral sheath is usually larger than the radius of the sheath body 100, but smaller than the diameter of the sheath body 100.

[0039] Based on this situation, in the embodiment of the present application, the two diaphragms 200 are offset to the first side of the second radial direction, and the second radial direction is perpendicular to the first radial direction. Please continue to refer to Figure 3 , Figure 3The b direction is the second radial direction. Under such a setting, in the open state, the second region 111b is distributed on the first side of the second radial direction, so that the cross-sectional area of ​​the second region 111b is smaller than the cross-sectional area of ​​the first region 111a. By setting the two diaphragms 200 offset in the second radial direction, the cross-sectional area of ​​the second region 111b can be smaller than the radial dimension of the insertion part, so the second region 111b has no capacity to accommodate the insertion part, while the cross-sectional area of ​​the first region 111a is larger than the radial dimension of the insertion part, and the first region 111a has capacity to accommodate the insertion part.

[0040] Based on the above technical solution, please continue to refer to Figure 4 and Figure 5 In the case where the insertion portion of the endoscope is inserted into the surgical channel 110, no matter what the posture of the insertion portion is in the surgical channel 110, as long as the perfusion operation is performed to switch the diaphragm 200 from a closed state to an open state, based on the abutment effect of the diaphragm 200 on the insertion portion, the diaphragm 200 can automatically push the insertion portion into the first area 111a during the deformation process and restrain the insertion portion, thereby ensuring the patency of the surgical channel 110 in the second area 111b; at the same time, in the early stage of inserting the insertion portion, the insertion of the insertion portion is arbitrary, and there is no need to deliberately limit the insertion portion to the first area 111a, which reduces the difficulty of operation for the operator.

[0041] It should be noted that in the embodiment of the present application, the two diaphragms 200 are biased at the first side of the second radial direction, which may refer to the situation that the two diaphragms 200 are completely biased at the first side of the second radial direction, or may refer to the situation that the main parts of the two diaphragms 200 are biased at the first side of the second radial direction, and is not limited to the situation that the two diaphragms 200 are completely biased at the first side of the second radial direction.

[0042] See also Figure 2 In some embodiments of the present application, the diaphragm 200 includes a first diaphragm segment 210 and a second diaphragm segment 220 connected to the first diaphragm segment 210. Compared with the second diaphragm segment 220, the first diaphragm segment 210 is adjacent to the second radial direction. In the closed state, along the circumferential direction of the sheath body 100, the second diaphragm segment 220 and the first diaphragm segment 210 are partially overlapped. In other words, see Figure 2 , Figure 2 The diaphragm 200 has a bending portion, which divides the diaphragm 200 into a first diaphragm segment 210 and a second diaphragm segment 220 overlapping the first diaphragm segment 210. Based on the bending and overlapping arrangement of the diaphragm 200, it can be ensured that the diaphragm 200 itself has a sufficient extension length. In this way, when the diaphragm 200 and the inner wall of the sheath body 100 are enclosed to form the perfusion channel 112, it can be ensured that the perfusion channel 112 has a larger channel size.

[0043] At the same time, based on the circumferential overlapping arrangement of the second diaphragm segment 220 and the first diaphragm segment 210 on the sheath body 100, when the two diaphragms 200 are in an open state, while ensuring that the perfusion channel 112 has a sufficient flow area, the two diaphragms 200 can still have a certain distance in the second radial direction, thereby ensuring the radial size of the second area 111b. When performing negative pressure suction operations, waste such as gravel can be discharged through the second area 111b, thereby improving the passability of waste such as gravel.

[0044] For further technical solutions, please continue to refer to Figure 2 and Figure 3 The first diaphragm segment 210 includes a first portion 211 and a second portion 212 extending circumferentially along the sheath body 100 , wherein the first portion 211 is connected to the inner wall of the sheath body 100 , and the second portion 212 is connected to the second diaphragm segment 220 and overlapped, and the thickness of the second portion 212 is less than the thickness of the first portion 211 .

[0045] When the perfusion liquid is poured into the perfusion channel 112, because the thickness of the second part 212 is smaller than that of the first part 211, the perfusion liquid is easily filled between the second part 212 and the second diaphragm segment 220, and the second part 212 is first to be offset and deformed toward the inner side of the sheath body 100, and the offset deformation of the second part 212 is large, and gradually drives the first part 211 and the second diaphragm segment 220 to separate from the inner wall of the sheath body 100. The second part 212 that is first to be offset and deformed can push the insertion part toward the first area 111a and constrain it in the first area 111a. That is to say, the thickness of the second part 212 is set to be smaller than that of the first part 211, so that the diaphragm 200 can accurately push the insertion part into the first area 111a during the perfusion operation, thereby ensuring that the second area 111b has a larger passing space while ensuring the stability of the insertion of the insertion part, thereby improving the passability of waste such as gravel.

[0046] The inventor found in the research process that when the insertion portion of the endoscope is biased to one side in the surgical channel 110, the gap space of the first region 111a on both sides of the insertion portion gradually increases along the distribution direction of the first region 111a and the second region 111b. In some embodiments of the present application, in order to expand the radial space of the second region 111b as much as possible, the connection between the first part 211 and the sheath body 100 is biased to the second side of the second radial direction, that is, a small part of the diaphragm 200 is distributed on the second side of the second radial direction, and most of the diaphragm 200 is distributed on the first side of the second radial direction. In this way, the formed perfusion channel 112 can occupy as much of the aforementioned gap space as possible, so that more space can be freed for the second region 111b while ensuring the channel size of the perfusion channel 112 and the extension size of the diaphragm 200, and the radial space distribution of the first region 111a and the second region 111b is reasonably optimized, ensuring the passability of waste such as gravel.

[0047] In some embodiments of this application, see Figure 2 Along the circumferential direction of the sheath body 100, the extension length of the second portion 212 is smaller than the extension length of the first portion 211. In this case, based on the fact that the thickness of the second portion 212 is smaller than the thickness of the first portion 211, when the perfusion liquid is perfused into the perfusion channel 112, the width of the perfusion channel 112 gradually increases along the distribution direction of the first area 111a and the second area 111b, and reaches the maximum width at the second portion 212. That is to say, the first portion 211 gradually deflects inward and has a covering and restraining effect on the insertion portion, thereby improving the restraining effect of the diaphragm 200 on the insertion portion.

[0048] In a further technical solution, when the diaphragm 200 is in an open state, the first diaphragm segment 210 is recessed toward the inner wall of the sheath body 100 to form an arc-shaped structure; with such a configuration, when the insertion part is inserted into the instrument channel 110, the first diaphragm segment 210 can have a good covering effect on the insertion part, thereby ensuring the stability of the insertion part in the surgical channel 110 and preventing it from shaking and invading the second area 111b.

[0049] In some embodiments of the present application, the distal end of the perfusion channel 112 can pass through the sheath body 100. In this way, during the perfusion operation, the perfusion fluid or drug can reach the target area directly and quickly, reducing the perfusion delay caused by poor channel flow or unreasonable design, thereby improving the overall treatment or surgical efficiency; at the same time, since the perfusion channel 112 is directly connected to the distal end of the sheath body 100, the perfusion fluid or drug can maintain a relatively uniform distribution when flowing out, reducing the uneven perfusion phenomenon caused by poor flow or uneven pressure.

[0050] In some embodiments of the present application, the distal end of the perfusion channel 112 is closed, and a liquid outlet 130 connected to the perfusion channel 112 is provided on the distal side wall of the sheath body 100. Under such a configuration, the perfusion liquid is sprayed outward from the liquid outlet 130 on the distal side wall of the sheath body 100. Under the action of negative pressure suction, the perfusion liquid sprayed through the liquid outlet 130 flows downstream to the distal end of the sheath body 100, and can carry waste such as gravel in the distal area of ​​the insertion part into the second area 111b of the surgical channel 110. Compared with the method in which the perfusion channel 112 runs through the distal end of the sheath body 100, the method in which the distal side wall of the sheath body 100 is opened can form a good water circulation at the distal end of the sheath body 100, and is conducive to bringing out waste such as gravel from the distal periphery of the sheath body 100, while avoiding the snowstorm phenomenon and making the observation field clear.

[0051] In the examples of this application, see Figure 1 , Figure 2 , Figure 6 and Figure 7 The ureteral sheath also includes a conductive member 300 and a sheath seat 400. A liquid inlet 120 connected to the perfusion channel 112 is also provided on the proximal side wall of the sheath body 100. The conductive member 300 is sleeved on the proximal end of the sheath body 100 and corresponds to the liquid inlet 120. The conductive member 300 is arranged in the sheath seat 400. A conductive cavity 310 extending along its circumference is provided on the conductive member 300. The conductive cavity 310 conducts the two liquid inlet holes 120. The sheath seat 400 is provided with a perfusion nozzle 410 connected to the conductive cavity 310. When the perfusion liquid is perfused through the perfusion nozzle 410, the conductive cavity 310 can make the perfusion liquid fill the two perfusion channels 112 at the same time, thereby improving the convenience during the perfusion operation.

[0052] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0053] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A ureteral sheath, characterized in that: include: A sheath body (100), wherein the sheath body (100) is provided with a surgical channel (110); A diaphragm (200), wherein two diaphragms (200) are arranged in the surgical channel (110), and the two diaphragms (200) are distributed on both sides of a first radial direction, so as to separate the surgical channel (110) into an instrument channel (111) and two perfusion channels (112); The diaphragm (200) has a closed state and an open state. In the closed state, the diaphragm (200) is attached to the inner wall of the sheath body (100). The diaphragm (200) is configured to switch from the closed state to the open state when the perfusion channel (112) is filled with perfusion liquid. In the open state, the two diaphragms (200) separate the instrument channel (111) into a first area (111a) and a second area (111b) distributed along a first radial direction. The two diaphragms (200) are offset to a first side of a second radial direction, the second radial direction being perpendicular to the first radial direction. In the open state, the second area (111b) is distributed to a first side of the second radial direction, so that the cross-sectional area of ​​the second area (111b) is smaller than the cross-sectional area of ​​the first area (111a). In the open state, the diaphragms (200) arranged on both sides of the first radial direction can jointly push the insertion portion of the endoscope so that the insertion portion is located in the first area (111a).

2. The ureteral sheath according to claim 1, characterized in that: The diaphragm (200) comprises a first diaphragm segment (210) and a second diaphragm segment (220). In the closed state, along the circumferential direction of the sheath body (100), the second diaphragm segment (220) is arranged to overlap with a portion of the first diaphragm segment (210).

3. The ureteral sheath according to claim 2, characterized in that: The first diaphragm segment (210) comprises a first portion (211) and a second portion (212) which are distributed along the circumference of the sheath body (100), wherein the first portion (211) is connected to the inner wall of the sheath body (100), and the second portion (212) is connected to the second diaphragm segment (220) and overlapped, and the thickness of the second portion (212) is smaller than the thickness of the first portion (211).

4. The ureteral sheath according to claim 3, characterized in that: The connection between the first portion (211) and the sheath body (100) is offset to the second side in the second radial direction.

5. The ureteral sheath according to claim 3, characterized in that: An extension length of the second portion (212) is smaller than an extension length of the first portion (211).

6. The ureteral sheath according to any one of claims 2 to 5, characterized in that: In the open state, the first diaphragm section (210) is recessed toward the inner wall of the sheath body (100) to form an arc-shaped structure.

7. The ureteral sheath according to any one of claims 1 to 5, characterized in that: The distal end of the perfusion channel (112) passes through the sheath body (100); alternatively, the distal end of the perfusion channel (112) is closed, and a liquid outlet (130) communicating with the perfusion channel (112) is provided on the distal side wall of the sheath body (100).

8. The ureteral sheath according to claim 7, characterized in that: The invention also comprises a conducting piece (300), and a liquid inlet hole (120) connected to the perfusion channel (112) is also arranged on the proximal side wall of the sheath body (100); the conducting piece (300) is sleeved on the proximal end of the sheath body (100) and corresponds to the liquid inlet hole (120); the conducting piece (300) is provided with a conducting cavity (310) extending along its circumference, and the conducting cavity (310) conducts the two liquid inlet holes (120).

9. The ureteral sheath according to claim 8, characterized in that: It also comprises a sheath seat (400), the conductive member (300) being arranged in the sheath seat (400), and a perfusion nozzle (410) being arranged on the sheath seat (400) and being connected to the conductive cavity (310).

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