A sheath and a negative pressure suction sheath

Abstract

The application discloses a sheath body and a negative pressure suction sheath and belongs to the technical field of medical devices. The sheath body is applied to the negative pressure suction sheath and comprises a sheath body and a branch pipe. A main channel cavity is arranged in the sheath body. A distal end opening in communication with the main channel cavity is arranged at the distal end of the sheath body. The distal end opening is used for connecting a sheath pipe. An adjusting hole in communication with the main channel cavity is arranged on the side wall of the sheath body. One end of the branch pipe is fixed to the outer wall of the sheath body and is in communication with the main channel cavity. The other end of the branch pipe is used for connecting a negative pressure source. The branch pipe is located on the side of the sheath body away from the adjusting hole. The sheath body is rotationally matched with the sheath pipe. The sheath body can rotate relative to the sheath pipe around a first rotation axis. The first rotation axis is collinear or parallel with the axis of the sheath pipe. The relative positions of the sheath pipe, the adjusting hole and the branch pipe are adjusted. According to the application, the adjusting hole and the branch pipe are arranged oppositely, the distance between the adjusting hole and the branch pipe is as far as possible, the liquid sucked into the main channel cavity is as far as possible from the adjusting hole, the liquid is prevented from flowing out of the adjusting hole, and the probability of water leakage at the adjusting hole is reduced.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a sheath and a negative pressure suction sheath. Background Technology

[0002] A negative pressure suction sheath is a medical device used in urological surgery, primarily for ureteroscopic procedures. It works by using negative pressure to suction out fluids, stones, and other substances from the ureter, thus maintaining a clear surgical field. During the procedure, the sheath can remove fragments of stone in real time, ensuring a clear surgical field.

[0003] In existing negative pressure suction sheath products, the negative pressure regulating valve is generally located on a branch pipe, which connects to the suction device, such as a negative pressure source. The suction effect of the negative pressure suction sheath is controlled by adjusting the negative pressure regulating valve to block the large air vent on the branch pipe. However, in actual use, the location of the negative pressure regulating valve is prone to leakage, leading to inconvenience and a risk of infection. Summary of the Invention

[0004] The purpose of this application is to provide a sheath and a negative pressure suction sheath to solve the above-mentioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a sheath body for use in negative pressure suction sheaths, comprising a sheath body and a branch tube. A main channel cavity is provided inside the sheath body, and a distal opening communicating with the main channel cavity is provided at the distal end of the sheath body for connecting the sheath tube. An adjustment hole communicating with the main channel cavity is provided on the side wall of the sheath body. One end of the branch tube is fixed to the outer wall of the sheath body and communicates with the main channel cavity, and the other end is used to connect to a negative pressure source. The branch tube is located on the side of the sheath body away from the adjustment hole. The sheath body and the sheath tube are rotatably coupled, and the sheath body can rotate relative to the sheath tube around a first rotating axis. The first rotating axis is collinear with or parallel to the axis of the sheath tube to adjust the relative position of the sheath tube, the adjustment hole, and the branch tube.

[0007] Secondly, embodiments of this application provide a negative pressure suction sheath, including the sheath body provided in the first aspect embodiment, and also including a sheath tube, which is installed at the distal opening and communicates with the main channel cavity.

[0008] The technical solution provided in this application can achieve the following beneficial effects:

[0009] In this application, when the branch pipe is connected to the negative pressure source, the suctioned liquid enters the main channel cavity and is then extracted through the branch pipe. By setting the regulating hole and the branch pipe opposite each other, the distance between the regulating hole and the branch pipe is maximized, so that the liquid suctioned into the main channel cavity can be kept as far away from the regulating hole as possible, thereby preventing the liquid from flowing out of the regulating hole and reducing the probability of water leakage at the regulating hole. By setting the sheath body and sheath tube to rotate and adjust the position of the regulating hole, the regulating hole can be located above the branch pipe, avoiding the situation where the sheath tube inside the human body causes discomfort to the human body during the rotation of the entire negative pressure suction sheath when adjusting the position of the regulating hole. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the overall structure of the sheath provided in some embodiments of this application;

[0012] Figure 2 This is a schematic diagram of the disassembly of the sheath provided in some embodiments of this application. Figure 1 ;

[0013] Figure 3 This is a cross-sectional view of the sheath provided in some embodiments of this application. Figure 1 ;

[0014] Figure 4 This application is about Figure 3 Detailed view of point A;

[0015] Figure 5 This is a cross-sectional view of the sheath provided in some embodiments of this application. Figure 2 ;

[0016] Figure 6 This application is about Figure 5 Detailed image of point B;

[0017] Figure 7 This is a cross-sectional view of the sheath provided in some embodiments of this application. Figure 3 ;

[0018] Figure 8 This application is about Figure 7 Detailed image of point C;

[0019] Figure 9 This is a schematic diagram of the disassembly of the sheath provided in some embodiments of this application. Figure 2 ;

[0020] Figure 10 This is a schematic diagram of the overall structure of the negative pressure suction sheath provided in some embodiments of this application.

[0021] In the diagram: 10-Sheath body, 100-Sheath shaft, 110-Main channel cavity, 120-Distal opening, 130-Adjustment hole, 140-First housing, 150-Second housing, 160-First mating protrusion, 161-Annular groove, 162-Mounting groove, 170-Second mating protrusion, 171-Annular protrusion, 172-Mounting notch, 200-Adjusting component, 300-Branch pipe, 400-Sealing component, 410-Limiting protrusion, 420-Baffle, 20-Sheath tube. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] In various embodiments of this application, "proximal end" and "distal end" refer to the position of the endoscope and its accessories relative to the user in the usage environment. The end closer to the user is designated as the "proximal end", and the end farther from the user is designated as the "distal end".

[0024] This application provides a sheath 10 for use in negative pressure suction sheaths. The sheath 10 includes a sheath body 100 and a branch tube 300, as can be seen in the following embodiments. Figure 1 and Figure 2 As shown. The sheath body 100 is the main structure of the sheath tube 20. A main channel cavity 110 is provided inside the sheath body 100. A distal opening 120 communicating with the main channel cavity 110 is provided at the distal end of the sheath body 100. The distal opening 120 is used to connect the sheath tube 20. An adjustment hole 130 communicating with the main channel cavity 110 is provided on the side wall of the sheath body 100. One end of the branch pipe 300 is fixed to the outer wall of the sheath body 100 and communicates with the main channel cavity 110. The other end is used to connect to a negative pressure source. The branch pipe 300 is located on the side of the sheath body 100 away from the adjustment hole 130.

[0025] When using a negative pressure suction sheath, the insertion part of the endoscope extends through the sheath body 100 into the sheath tube 20. The insertion part provides a delivery channel to inject liquid into the target location. The negative pressure source draws out the liquid, stones, etc., from the body through the gap between the insertion part and the sheath tube 20.

[0026] The regulating hole 130 connects the main channel cavity 110 to the atmospheric environment. By blocking the regulating hole 130, the suction effect of the negative pressure suction sheath can be controlled. When the regulating hole 130 is blocked, the negative pressure source can suction liquids, stones, etc., at the target location; when the regulating hole 130 is not blocked, the negative pressure source cannot suction substances at the target location, or the suction effect is weak. The suction effect of the negative pressure suction sheath can be controlled by adjusting the communication area between the regulating hole 130 and the atmospheric environment.

[0027] When the negative pressure suction sheath draws in liquids and stones, it blocks the regulating hole 130. Under the suction effect of the negative pressure source, the liquid and stones at the target location are drawn from the gap between the sheath tube 20 and the insertion part into the main channel cavity 110, and then discharged through the branch tube 300. In the embodiment provided in this application, by setting the regulating hole 130 and the branch tube 300 opposite to each other, the distance between the regulating hole 130 and the branch tube 300 is maximized. After the liquid enters the main channel cavity 110 through the distal opening 120 of the sheath body 100, the distance between the liquid and the regulating hole 130 is maximized during the flow from the distal opening 120 towards the location of the branch tube 300, thereby preventing the liquid from flowing out of the regulating hole 130 and reducing the probability of leakage at the regulating hole 130.

[0028] It is important to note that when using the negative pressure suction sheath, the position of the sheath body 100 should be carefully considered. The adjustment hole 130 should be facing upwards and the branch pipe 300 downwards. Under the suction effect of the negative pressure source and the gravity of the liquid, the probability of liquid leakage from the adjustment hole 130 will be further reduced, thus improving the waterproof effect.

[0029] In some embodiments of this application, the sheath body 100 is rotatably engaged with the sheath tube 20. The sheath body 100 can rotate relative to the sheath tube 20 around a first rotating axis. The first rotating axis is collinear with or parallel to the axis of the sheath tube 20, so as to adjust the relative position of the sheath tube 20 with the adjusting hole 130 and the branch tube 300.

[0030] The sheath body 100 and sheath tube 20 can rotate relative to each other. An adjustment hole 130 and a branch tube 300 are located on the sheath body 100. When the sheath body 100 and sheath tube 20 rotate, the relative positions of the adjustment hole 130 and branch tube 300 with respect to the sheath tube 20 change. The negative pressure suction sheath provided in this embodiment preferably allows the adjustment hole 130 to be positioned above the branch tube 300. When the adjustment hole 130 is not positioned above the branch tube 300, the position of the sheath body 100 needs to be adjusted to rotate the adjustment hole 130 above the branch tube 300.

[0031] By setting the sheath body 100 and sheath tube 20 to rotate in coordination, even if the adjustment hole 130 is not located above the branch tube 300 after the sheath tube 20 is inserted into the human body, the position of the adjustment hole 130 can be adjusted by rotating the sheath body 100. The operation is simple and convenient, which can avoid the discomfort and damage to the patient caused by the rotation of the sheath tube 20 inside the human body when rotating the entire negative pressure suction sheath. At the same time, rotating only the sheath body 100 is less difficult than rotating the entire negative pressure suction sheath.

[0032] In some preferred embodiments of this application, the adjustment hole 130 is arranged along the axial direction of the sheath 100. On the one hand, this facilitates the operator in adjusting the degree of obstruction of the adjustment hole 130. On the other hand, when the sheath 100 is laid flat for use, the distance between the adjustment hole 130 and the branch pipe 300 in the height direction can remain stable, preventing the height of the adjustment hole 130 from decreasing and causing liquid to overflow from the adjustment hole 130.

[0033] In some embodiments, the sheath 10 further includes an adjustment member 200, see reference. Figure 2 As shown, the adjusting member 200 is movably mounted on the outer wall of the sheath 100, and the adjusting member 200 can move relative to the sheath 100 to block the adjusting hole 130. The adjusting member 200 makes it easier for the operator to adjust the blocking of the adjusting hole 130. When the adjusting hole 130 is arranged along the axial direction of the sheath 100, the adjusting member 200 is movably engaged with the sheath 100 along the axial direction of the sheath 100.

[0034] The adjustment hole 130 is located on the side wall of the sheath 100. In some specific embodiments, the adjustment hole 130 is located near the proximal end of the sheath 100, which further increases the distance between the adjustment hole 130 and the branch pipe 300, and further prevents the liquid from flowing out from the adjustment hole 130.

[0035] The sheath tube 20 is rotatably connected to the sheath body 100. In some embodiments, the sheath tube 20 may be rotatably connected to the sheath body 100 at its connection position with the sheath body 100. In this case, the first axis of rotation is collinear with the axis of the sheath tube 20.

[0036] In other embodiments, the sheath body 100 may be divided into two rotatably fitted parts. One part is fixedly connected to the sheath tube 20, and the other part is provided with an adjustment hole 130 and a branch tube 300. The relative positions of the adjustment hole 130 and the branch tube 300 with the sheath tube 20 can be adjusted by rotating part of the sheath body 100. While keeping the position of the sheath tube 20 unchanged, the adjustment hole 130 is adjusted to be above the branch tube 300. In this case, the first rotating shaft can be collinear with or parallel to the axis of the sheath tube 20.

[0037] For example, refer to Figures 3 to 9As shown, the sheath body 100 includes a first housing 140 and a second housing 150 that are joined together along its axial direction. The distal opening 120 is located at the end of the first housing 140 away from the second housing 150. The sheath tube 20 is fixed to the first housing 140. The adjustment hole 130 and the branch tube 300 are both located in the second housing 150. The first housing 140 and the second housing 150 are both rotated and sealed around the first pivot.

[0038] The first housing 140 and the second housing 150 can rotate relative to each other, and the first housing 140 and the second housing 150 are sealed together to prevent the main channel cavity 110 from leaking air through the junction of the first housing 140 and the second housing 150, which would affect the normal use of the negative pressure suction sheath.

[0039] During the process of adjusting the position of the sheath body 100, the first housing 140, which is fixed to the sheath tube 20, remains in the same position, and the operator controls the second housing 150 to rotate, adjusting the adjustment hole 130 to be above the branch tube 300.

[0040] The sealing fit between the first housing 140 and the second housing 150 can have various structures. In some embodiments, the first housing 140 and the second housing 150 can form a seal through their own structures. In other embodiments, a sealing structure can be provided between the first housing 140 and the second housing 150 to form a seal. For example, the sheath 10 also includes a sealing element 400, see reference... Figures 3 to 9 As shown, the seal 400 is located between the first housing 140 and the second housing 150, and the seal 400 is in sealing fit with both the first housing 140 and the second housing 150. By connecting the first housing 140 and the second housing 150 with the seal 400, a sealing fit between the first housing 140 and the second housing 150 is achieved.

[0041] In some preferred embodiments, reference may be made to Figures 3 to 6 As shown, at least a portion of the seal 400 is fitted over the first housing 140 and / or the second housing 150, and the seal 400 radially engages with the sheath body 100 along its radial direction. The seal 400 is positioned within the sheath body 100 to prevent it from moving or collapsing into the main channel cavity 110 during relative rotation of the first housing 140 and the second housing 150, thus preventing sealing failure. In some embodiments, the seal 400 may be entirely fitted over the first housing 140 and / or the second housing 150. In other embodiments, a portion of the seal 400 may be fitted over either the first housing 140 or the second housing 150. For example, see [reference needed]. Figure 7 and Figure 8As shown, the outer ring of the seal 400 is provided with a limiting protrusion 410. The limiting protrusion 410 is directly sleeved on the outside of the first housing 140 or the second housing 150. At the same time, a corresponding mounting groove 162 can be provided on the first housing 140 or the second housing 150, and the limiting protrusion 410 is directly installed in the mounting groove 162.

[0042] In some preferred embodiments, at least a portion of the seal 400 is abutted between the adjacent end faces of the first housing 140 and the second housing 150. The seal 400 is elastic, and while providing a sealing function, it can also be compressed to accommodate assembly errors of the first housing 140 and the second housing 150.

[0043] In some preferred embodiments, the seal 400 is connected to a baffle 420, which is located in the main channel cavity 110 and is positioned on the side of the seal 400 closer to the adjustment hole 130, as can be seen from [reference needed]. Figure 3 and Figure 4 As shown, the baffle 420 forms a barrier at the distal end of the adjusting hole 130, preventing liquid from approaching the adjusting hole 130 due to inertia during the suction process, further reducing the probability of leakage from the sheath 100. Furthermore, the baffle 420 improves the structural stability of the seal 400 to a certain extent, preventing the seal 400 from deforming arbitrarily and causing its sealing function to fail.

[0044] In some embodiments, the seal 400 may be provided with a limiting protrusion 410 sleeved on the outside of the first housing 140 or the second housing 150 when it is abutted between the end faces of the first housing 140 and the second housing 150 that are close to each other, and may also be connected with a baffle 420.

[0045] The rotational engagement of the first housing 140 and the second housing 150 can have various structures. In some embodiments, the first housing 140 and the second housing 150 are rotated together through their mating ends. When a seal 400 is provided, the seal 400 can be located between the mutually abutting ends of the two housings.

[0046] In other embodiments, reference may be made to Figures 1 to 9 As shown, one of the first housing 140 and the second housing 150 is fitted over the other, and the peripheral sidewalls of the two are in contact with each other. The sealing effect can be achieved through the contact surface between the peripheral sidewalls, or the sealing element 400 can be provided between the peripheral sidewalls or end faces of the two in contact to achieve the sealing effect.

[0047] In the peripheral sidewalls where the first housing 140 and the second housing 150 contact each other, one peripheral sidewall is provided with an annular groove 161, and the other peripheral sidewall is provided with an annular protrusion 171. The annular protrusion 171 engages with the annular groove 161, restricting the relative position of the first housing 140 and the second housing 150 in the axial direction of the sheath body 100. The first housing 140 and the second housing 150 are engaged, and the assembly method is simple and convenient.

[0048] In some specific implementation methods, please refer to Figures 3 to 8 As shown, in the end faces of the first housing 140 and the second housing 150 that are close to each other, one of them is provided with a first mating protrusion 160 and the other is provided with a second mating protrusion 170. The second mating protrusion 170 is sleeved on the outside of the first mating protrusion 160. The end of the first mating protrusion 160 abuts against the end face of the first housing 140 or the second housing 150 that is connected to the second mating protrusion 170. A sealing element 400 is provided between the two. The annular groove 161 and the annular protrusion 171 are respectively provided on the peripheral sidewalls where the first mating protrusion 160 and the second mating protrusion 170 are in contact with each other.

[0049] By providing the first mating protrusion 160 and the second mating protrusion 170, the first housing 140 and the second housing 150 have peripheral sidewalls that contact each other in the radial direction of the sheath body 100, that is, the peripheral sidewalls of the first mating protrusion 160 and the second mating protrusion 170 that contact each other, and also have end faces that contact each other in the axial direction of the sheath body 100, that is, the end face of the first mating protrusion 160 and the end face of the second mating protrusion 170.

[0050] On the one hand, increasing the contact area between the first housing 140 and the second housing 150 improves stability to a certain extent. On the other hand, a sealing structure and a snap-fit ​​structure can be provided. The snap-fit ​​structure consists of an annular groove and an annular protrusion 171. When the first housing 140 and the second housing 150 pass through the snap-fit ​​structure, the sealing of the first housing 140 and the second housing 150 is completed simultaneously.

[0051] In other embodiments, the seal 400 may be disposed between the peripheral sidewalls of the first mating protrusion 160 and the second mating protrusion 170 that are in contact with each other; however, this would increase the assembly resistance between the first housing 140 and the second housing 150. Disposing the seal 400 at the end face of the first mating protrusion 160 reduces the assembly resistance between the two housings.

[0052] After the annular protrusion 171 engages with the annular groove, the first housing 140 and the second housing 150 are engaged in an axial upper limit fit within the sheath body 100, ensuring stable axial positioning of both. Furthermore, both the protrusion and the groove are annular structures, preventing any interference with the relative rotation between the first housing 140 and the second housing 150. Additionally, the seal 400 located between the two end faces increases the friction between the first housing 140 and the second housing 150, preventing the second housing 150 from rotating relative to the first housing 140 after it has reached its designated position.

[0053] The seal 400 may partially cover the first mating protrusion 160. For example, see [reference needed]. Figure 8 As shown, the seal 400 is provided with a limiting protrusion 410, and the outer side of the first mating protrusion 160 is provided with an installation groove 162. The limiting protrusion 410 is installed in the installation groove 162. The limiting protrusion 410 is matched with the first mating protrusion 160 in the radial direction of the sheath body 100 to prevent the limiting protrusion 410 from deforming and sinking into the main channel cavity 110.

[0054] In some preferred embodiments of this application, the peripheral sidewall of the first mating protrusion 160 or the peripheral sidewall of the second mating protrusion 170 is provided with at least two annular grooves 161 along its axial direction, and the number of annular protrusions 171 is less than the number of annular grooves 161.

[0055] An annular groove 161 can be provided on the first mating protrusion 160. When either an annular protrusion 171 is engaged with one of the two annular grooves 161 located adjacent to the root of the first mating protrusion 160, the seal 400 is in a compressed state. The seal 400, in its compressed state, forms a seal at the connection point of the first housing 140 and the second housing 150. Regardless of which annular protrusion 171 is engaged with either of the two annular grooves 161, a seal between the first housing 140 and the second housing 150 can be achieved, ensuring a good sealing effect. The root of the first mating protrusion 160 refers to the end that connects to the first housing 140 or the second housing 150.

[0056] The annular groove 161 can also be provided on the second mating protrusion 170. When either annular protrusion 171 is engaged with two annular grooves 161 provided at the root of the second mating protrusion 170, the seal 400 is in a compressed state. The root of the second mating protrusion 170 refers to the end that is connected to the first housing 140 or the second housing 150.

[0057] During the docking process of the first housing 140 and the second housing 150, the housings need to undergo appropriate deformation so that the annular protrusion 171 can engage with the annular groove. In some embodiments provided in this application, please refer to... Figure 9As shown, the outermost end of either the first housing 140 or the second housing 150 near the other has a mounting notch 172. That is, when the first housing 140 is fitted over the second housing 150, the mounting notch 172 at the end of the first housing 140 near the second housing 150 allows for a certain deformation allowance, preventing damage to the first housing 140 during assembly. Similarly, when the second housing 150 is fitted over the first housing 140, the mounting notch 172 at the end of the second housing 150 near the first housing 140 allows for a certain deformation allowance, preventing damage to the second housing 150 during assembly.

[0058] This application also provides a negative pressure suction sheath, see reference. Figure 10 As shown, the sheath 10 provided in any of the above embodiments also includes a sheath tube 20, which is installed at the distal opening 120 and communicates with the main channel cavity 110.

[0059] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0060] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A sheath for use in a negative pressure suction sheath, characterized by, The sheath body (100) is provided with a main channel cavity (110) therein, a distal end of the sheath body (100) is provided with a distal end opening (120) in communication with the main channel cavity (110), the distal end opening (120) is used for connecting a sheath tube (20), a side wall of the sheath body (100) is provided with an adjusting hole (130) in communication with the main channel cavity (110); A branch pipe (300) is fixed to an outer wall of the sheath body (100) at one end and is in communication with the main channel cavity (110), and the other end is used for connecting a negative pressure source, the branch pipe (300) is located on a side of the sheath body (100) away from the adjusting hole (130); The sheath body (100) is rotationally matched with the sheath tube (20), the sheath body (100) can rotate relative to the sheath tube (20) around a first rotation axis, the first rotation axis is collinear or parallel with an axis of the sheath tube (20), so as to adjust the relative position of the sheath tube (20) and the adjusting hole (130) and the branch pipe (300); The sheath body (100) comprises a first shell (140) and a second shell (150) which are butted along an axial direction of the sheath body (100), the distal end opening (120) is located at one end of the first shell (140) away from the second shell (150), the adjusting hole (130) and the branch pipe (300) are both located in the second shell (150), the first shell (140) and the second shell (150) are rotationally and sealingly matched around the first rotation axis, the sheath body (10) further comprises a sealing member (400) located between the first shell (140) and the second shell (150), and the sealing member (400) is sealingly matched with the first shell (140) and the second shell (150) respectively, the sealing member (400) is connected with a baffle (420), the baffle (420) is located in the main channel cavity (110), and the baffle (420) is located on a side of the sealing member (400) close to the adjusting hole (130). The adjusting hole (130) is arranged along the axial direction of the sheath body (100); 2. A sheath according to claim 1, wherein, And / or, the sheath body (10) further comprises an adjusting member (200) movably mounted to an outer wall of the sheath body (100), the adjusting member (200) can move relative to the sheath body (100) to shield the adjusting hole (130); And / or, the adjusting hole (130) is arranged adjacent to a proximal end of the sheath body (100). At least part of the sealing member (400) is sleeved on the first shell (140) and / or the second shell (150) outside, and the sealing member (400) is limitingly matched with the sheath body (100) along a radial direction of the sheath body (100); 3. A sheath according to claim 1, wherein, And / or, at least part of the sealing member (400) is abuttingly arranged between end faces of the first shell (140) and the second shell (150) close to each other. ​ 4. The sheath of claim 1, wherein, One of the first shell (140) and the second shell (150) is sleeved on the other, and one of the circumferential side walls of the first shell (140) and the second shell (150) is provided with an annular clamping groove (161), and the other is provided with an annular protrusion (171) clamped in the annular clamping groove (161).

5. A sheath according to claim 4, wherein, One of the end faces of the first shell (140) and the second shell (150) is provided with a first butt protrusion (160), and the other is provided with a second butt protrusion (170), wherein the second butt protrusion (170) is sleeved on the first butt protrusion (160), the end of the first butt protrusion (160) abuts against the end face of the first shell (140) or the second shell (150) corresponding to the connection of the second butt protrusion (170), and a sealing element (400) is arranged between the two, and the annular clamping groove (161) and the annular protrusion (171) are arranged on the circumferential side walls of the first butt protrusion (160) and the second butt protrusion (170) contacting each other respectively. And / or, the first shell (140) or the second shell (150) located on the outside is provided with a mounting notch (172) near the end of the other.

6. A sheath according to claim 5, wherein, The circumferential side wall of the first butt protrusion (160) or the circumferential side wall of the second butt protrusion (170) is provided with at least two annular clamping grooves (161) along the axial direction, and the number of the annular protrusions (171) is less than the number of the annular clamping grooves (161). The annular clamping grooves (161) are arranged on the first butt protrusion (160), and in the case that any one of the annular protrusions (171) is clamped in two annular clamping grooves (161) arranged adjacent to the root of the first butt protrusion (160), the sealing element (400) is in a compressed state; or the annular clamping grooves (161) are arranged on the second butt protrusion (170), and in the case that any one of the annular protrusions (171) is clamped in two annular clamping grooves (161) arranged adjacent to the root of the second butt protrusion (170), the sealing element (400) is in a compressed state.

7. A negative pressure suction sheath characterized by, The sheath (10) of any one of claims 1-6 further comprises a sheath tube (20) mounted on the distal end opening (120) and in communication with the main channel cavity (110).

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