A sheath assembly, suction sheath, insertion assembly, and endoscope assembly

Abstract

The application discloses a sheath assembly, a suction sheath, an insertion assembly and an endoscope assembly, and belongs to the technical field of medical devices. The sheath assembly is applied to a negative pressure suction sheath, and comprises a sheath tube and a flexible assembly. The flexible assembly is installed at the distal end of the sheath tube. The flexible assembly comprises a flexible sleeve film. The proximal end of the flexible sleeve film is connected with the sheath tube. The distal end of the flexible sleeve film is used for fixing the sleeve film to an insertion part of an endoscope which is arranged in the sheath tube. The flexible sleeve film can form a fluid channel with the peripheral side wall of the insertion part. The distal end of the flexible sleeve film can move relative to the sheath tube under the driving of the insertion part. The flexible sleeve film is connected with the sheath tube. The flexible sleeve film and the insertion part are matched. The fluid channel is formed between the flexible sleeve film and the insertion part. The suction effect on liquid and stone debris is improved. Meanwhile, the damage of the sheath tube movement to the ureter is avoided, and the damage of the sheath tube bending to the insertion part is avoided.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a sheath assembly, a suction sheath, an insertion assembly, and an endoscope assembly. Background Technology

[0002] In existing technologies, stone removal surgery usually uses a combination of endoscope and sheath. The sheath is used to create a channel in the ureter, and the endoscope is inserted into the sheath. During the operation, the endoscope is extended, retracted, or bent to adjust the position and orientation of the distal end of the endoscope.

[0003] During kidney stone surgery, the sheath and endoscope are inserted into the renal calyx. The instrument channel of the endoscope is the input channel, through which fluid is infused into the renal calyx. The channel between the sheath and the endoscope is the output channel, which is connected to a negative pressure source to aspirate excess fluid from the renal calyx to the outside.

[0004] Normally, the surgeon holds the renal sheath, stabilizing its position, and only moves the distal end of the endoscope within the renal calyces. This avoids friction between the sheath and the ureter, preventing damage to the ureteral wall. However, if the sheath remains stationary and only the endoscope moves within the renal calyces, the distance between the fluid outlet of the inflow channel and the fluid inflow of the outflow channel becomes too long. This increases the suction force required, making it less effective at controlling intrarenal pressure and removing stones. Furthermore, due to the large distance, many stone fragments are not easily aspirated and may deposit directly within the renal calyces, potentially leading to the formation of new stones. Conversely, if the sheath and endoscope are moved simultaneously within the renal calyces to maintain effective suction of fluid and stone fragments, friction between the sheath and the ureter can occur, potentially damaging the ureteral wall. Summary of the Invention

[0005] The purpose of this application is to provide a sheath assembly, a suction sheath, an insertion assembly, and an endoscope assembly to solve the aforementioned technical problems existing in the prior art.

[0006] This application is implemented as follows:

[0007] In a first aspect, embodiments of this application provide a sheath assembly for use in a negative pressure suction sheath, comprising a sheath and a flexible component. The flexible component is installed at the distal end of the sheath and includes a flexible diaphragm. The proximal end of the flexible diaphragm is connected to the sheath, and the distal end of the flexible diaphragm is used to fix it to the insertion part of an endoscope inserted through the sheath. The flexible diaphragm can form a fluid channel with the peripheral sidewall of the insertion part. The distal end of the flexible diaphragm can move relative to the sheath under the drive of the insertion part.

[0008] Secondly, embodiments of this application provide an attraction sheath, including the sheath assembly provided in the first aspect embodiment.

[0009] Thirdly, embodiments of this application provide an insertion assembly, including the sheath assembly provided in the first aspect embodiment.

[0010] Fourthly, embodiments of this application provide an endoscope assembly, including the insertion assembly provided in the third aspect embodiment.

[0011] The technical solution provided in this application can achieve the following beneficial effects:

[0012] In this application, a flexible sheath is connected to the sheath at its proximal end and to the insertion part at its distal end. The distal end of the flexible sheath can move with the insertion part. When the insertion part extends out of the sheath, the flexible sheath also extends out of the sheath. A fluid channel is formed between the flexible sheath and the insertion part, and the fluid channel communicates with the inside of the sheath. The opening of the fluid channel is located around the distal end of the insertion part. When the sheath is connected to a negative pressure source, it is convenient to improve the suction effect of lithotripsy and reduce the probability of lithotripsy depositing in the renal calyces.

[0013] Meanwhile, the sheath assembly provided in this application maintains a fixed position during stone treatment, and only the insertion part needs to be moved to maintain a good suction effect on the fragmented stones, thus avoiding damage to the ureter caused by the simultaneous movement of the sheath and endoscope. In addition, the flexible sheath can better adapt to the bending movement of the insertion part, preventing damage to the endoscope insertion part caused by the bending of the sheath during the synchronous movement of the sheath and endoscope. Attached Figure Description

[0014] 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.

[0015] Figure 1 This is a schematic diagram of the overall structure of the insertion component provided in some embodiments of this application;

[0016] Figure 2 This is a schematic diagram of the split structure of the insertion component provided in some embodiments of this application;

[0017] Figure 3 This is a schematic diagram of the distal structure of the insertion component provided in some embodiments of this application. Figure 1 ;

[0018] Figure 4 This is a cross-sectional view of the distal structure of the insertion component provided in some embodiments of this application. Figure 1 ;

[0019] Figure 5This is a disassembled schematic diagram of the sheath assembly provided in some embodiments of this application;

[0020] Figure 6 This is a cross-sectional view of the distal end of the sheath provided in some embodiments of this application;

[0021] Figure 7 This is a schematic diagram of the distal structure of the insertion component provided in some embodiments of this application. Figure 2 ;

[0022] Figure 8 This is a cross-sectional view of the distal structure of the insertion component provided in some embodiments of this application. Figure 2 ;

[0023] Figure 9 This is a schematic diagram of the structure of an endoscope assembly provided in some embodiments of this application. Figure 1 ;

[0024] Figure 10 This is a schematic diagram of the structure of an endoscope assembly provided in some embodiments of this application. Figure 2 ;

[0025] Figure 11 This is a schematic diagram illustrating the use of sheaths and endoscopes within the renal calyces in related technologies.

[0026] In the diagram: 100-Sheath, 110-Installation cavity, 200-Installation section, 210-Instrument channel, 300-Suction channel, 400-Flexible component, 410-Cuff, 420-Flexible sheath, 430-Support, 440-Fixing ring, 500-Handle, 600-Sheath body. Detailed Implementation

[0027] 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.

[0028] In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0029] 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".

[0030] In related technologies, the cooperation between the sheath 100 and the endoscope insertion part 200 can be referred to Figure 11 As shown, both the sheath 100 and the insertion part 200 are inserted into the renal calyx. The position of the sheath 100 remains unchanged, and the position of the insertion part 200 is moved to grasp the stone. The direction of fluid flow is indicated by the dashed arrow in the figure. Because the distance between the distal end of the insertion part 200 and the distal end of the sheath 100 is relatively large, the fluid output from the insertion part 200 is not easily aspirated into the sheath 100, and stone fragments are easily deposited in the renal calyx.

[0031] In view of this, embodiments of this application provide a sheath assembly for use in a negative pressure suction sheath, which can be referred to as follows. Figure 2 As shown, the sheath assembly includes a sheath 100 and a flexible component 400. The sheath 100 is used in conjunction with the insertion portion 200 of an endoscope; specifically, the insertion portion 200 passes through the sheath 100. (Refer to...) Figure 4 As shown, an aspiration channel 300 is formed between the outer peripheral wall of the insertion part 200 and the inner peripheral wall of the sheath 100. The insertion part 200 is part of an endoscope. The insertion part 200 has an instrument channel 210 for delivering fluids and surgical instruments during the procedure, and the distal opening of the instrument channel 210 is located at the distal end face of the insertion part 200.

[0032] During stone treatment, an optical fiber is typically inserted into the renal calyx through instrument channel 210. The stone is broken up at the distal end of the insertion section 200. Simultaneously, saline solution is delivered towards the stone site via instrument channel 210 to lower the temperature and provide some buffering. The aspiration channel 300 then aspirates the liquid mixed with the stone fragments to remove them from the body.

[0033] refer to Figure 3 and Figure 4 As shown, the flexible component 400 is installed at the distal end of the sheath 100. The flexible component 400 includes a flexible diaphragm 420. The proximal end of the flexible diaphragm 420 is connected to the sheath 100, and the distal end of the flexible diaphragm 420 is used to fix it to the distal end of the insertion part 200 of the endoscope that passes through the sheath 100. The flexible diaphragm 420 can form a fluid channel with the outer peripheral wall of the insertion part 200.

[0034] The flexible sheath 420 is sleeved outside the insertion part 200, and the flexible sheath 420 and the insertion part 200 are not completely fitted together, but have a fluid channel. The fluid channel communicates with the inside of the sheath 100 and with the suction channel 300 formed between the sheath 100 and the insertion part 200.

[0035] The distal end of the flexible sheath 420 can move relative to the sheath 100 under the drive of the insertion part 200. Since the distal end of the flexible sheath 420 is fixed to the insertion part 200, the distal end of the flexible sheath 420 will move synchronously with the insertion part 200. As the distal end of the insertion part 200 extends out of the sheath 100 and continues to move, it will drive the distal end of the flexible sheath 420 away from the sheath 100. The flexible sheath 420 and the outer peripheral wall of the insertion part 200 form a fluid channel, which is also connected to the suction channel 300. This fluid channel can also be regarded as an extension of the suction channel 300. The opening of the fluid channel corresponds to the position of the distal end of the insertion part 200. Even if the distal end of the insertion part 200 extends a certain distance beyond the sheath 100, the actual suction inlet of the suction channel 300 can still be set near the instrument channel 210 of the insertion part 200, so as to timely suction the liquid mixed with the stone fragments, improve the suction effect of the stone fragments, and avoid the situation where the stone is broken and then scattered and deposited in the renal calyx because the stone is far away from the suction channel 300 and cannot be suctioned into the suction channel 300 in time.

[0036] Furthermore, the proximity of the inlet of the aspiration channel 300 to the instrument channel 210 can appropriately reduce the suction force required for the aspiration channel 300 and also allow for timely extraction of fluid. Simultaneously, it facilitates the regulation of pressure within the renal calyces.

[0037] Compared to related technologies that involve synchronously moving the sheath 100 and the insertion portion 200 of the endoscope to maintain optimal suction of fluid and stone fragments, the embodiment provided in this application utilizes the cooperation between the flexible sheath 420 and the insertion portion 200. Only the insertion portion 200 needs to be moved, which in turn moves the flexible sheath 420, without moving the sheath 100. This avoids ureteral damage caused by synchronously moving the sheath 100 and the insertion portion 200. Furthermore, the flexible sheath 420 can extend the suction channel 300, making the fluid inlet (the distal opening of the instrument channel 210) adjacent to the fluid outlet (the distal opening of the flexible sheath 420). This avoids unsatisfactory suction and renal pressure regulation due to excessive distance between the inlet and outlet.

[0038] In addition, during the process of moving only the insertion part 200, since the flexible sheath 420 is a flexible structure, it can better adapt to the bending action of the insertion part 200, and can avoid the damage caused to the insertion part 200 by the relatively hard sheath 100 during the synchronous bending process of the sheath 100 and the insertion part 200 in the related technology.

[0039] In some preferred embodiments of this application, reference may be made to Figure 3 and Figure 4As shown, the flexible component 400 also includes a collar 410. The collar 410 is fixed to the distal end of the flexible sheath 420 and is used to securely fit onto the distal end of the insertion portion 200. A gap exists between the inner peripheral wall of the collar 410 and the outer peripheral wall of the insertion portion 200. When the insertion portion 200 moves relative to the sheath 100, the insertion portion 200 drives the flexible sheath 420 to move via the collar 410 fixed thereto.

[0040] The flexible sheath 420 is indirectly fixed to the distal end of the insertion part 200 through the collar 410. At the same time, there is still a gap between the collar 410 and the outer peripheral wall of the insertion part 200. This gap is connected to the fluid channel to ensure the communication between the inside of the sheath 100 and the external environment, and to ensure that the negative pressure source connected to the sheath 100 can suction the target position.

[0041] It is understood that in the embodiments provided in this application, the diameter of the collar 410 is larger than the diameter of the insertion portion 200, so as to form a gap between the inner peripheral wall of the collar 410 and the outer peripheral wall of the insertion portion 200. In some preferred embodiments, the radial dimension of the collar 410 may be equal to the radial dimension of the sheath 100. The collar 410 hardly affects the insertion of the sheath 100, and at the same time, the collar 410 does not affect the size of the suction channel 300.

[0042] In some embodiments of this application, the flexible sheath 420 can be configured as a bellows structure, and the flexible sheath 420 is stretched as the insertion portion 200 extends further out of the sheath tube 100. The length of the bellows-structured flexible sheath 420 can adaptively change with the distance the insertion portion 200 extends out of the sheath tube 100. In other embodiments of this application, the flexible sheath 420 can be movably connected to the sheath tube 100, and the flexible sheath 420 is driven to move outward from the sheath tube 100 as the distance the insertion portion 200 extends out of the sheath tube 100 increases. In still other embodiments, the proximal end of the flexible sheath 420 can be directly fixed to the proximal end of the sheath tube 100. Since the flexible sheath 420 is a flexible structural component, it can be stacked at the distal end of the sheath tube 100. Alternatively, the flexible sheath 420 can be made of an elastic material, and the flexible sheath 420 can be stretched. The proximal end of the flexible sheath 420 is fixed to the sheath 100. As the insertion part 200 extends into the sheath 100, the flexible sheath 420 is stretched. Moreover, since both ends of the flexible sheath 420 are subjected to tension, the flexible sheath 420 is not prone to collapse.

[0043] In some embodiments provided in this application, the flexible component 400 further includes a support member 430, the distal end of which is fixed to the collar 410, and the proximal end of which is movably engaged with the sheath 100. The support member 430 is used to support the flexible sheath 420 to prevent the flexible sheath 420 from deforming toward its axial position.

[0044] The support member 430 primarily serves a supporting function and possesses a certain degree of rigidity. The support member 430 can move along with the insertion part 200, thereby supporting the flexible sleeve 420. The support member 430 can be fixedly connected to the flexible sleeve 420, or it can be directly disposed within the flexible sleeve 420, providing internal support. In another embodiment, the support member 430 can be embedded into the flexible sleeve 420.

[0045] In some embodiments, there are multiple support members 430, which are evenly distributed along the circumference of the collar 410, as shown in the reference. Figure 5 As shown, multiple support members 430 uniformly support the flexible sleeve 420 in the circumferential direction.

[0046] The support member 430 can be made of a metal material with a certain degree of elasticity, ensuring that even if the support member 430 bends with the insertion part 200, it can return to its original position when the insertion part 200 returns to its original position. The support member 430 can be configured as a sheet-like structure or a filament-like structure extending along the axis of the sheath tube 100. By being positioned along the axis of the sheath tube 100, the influence of the support member 430 on the bending motion of the insertion part 200 is minimized. A sheet-like structure of the support member 430 can improve its support effect on the flexible sheath 420. A filament-like structure of the support member 430 can further reduce its influence on the bending motion of the insertion part 200.

[0047] In some preferred embodiments, the flexible component 400 further includes a retaining ring 440, which is movably engaged with the sheath 100, and the proximal end of the support member 430 is fixed to the retaining ring 440. Both ends of the support member 430 are constrained between the collar 410 and the retaining ring 440, effectively preventing deformation and collapse of the support member 430. Preferably, the retaining ring 440 is coaxially arranged with the sheath 100, which facilitates the synchronous bending of the flexible sheath 420 and the insertion portion 200.

[0048] The distal end of the flexible sheath 420 is fixed to the fixing ring 440, while the proximal end is fixed to the collar 410. The fixed ends of the flexible sheath 420 ensure overall shape and positional stability, and the support member 430 supports the flexible sheath 420 to prevent collapse. Simultaneously, the fixing ring 440 is also fixed to the collar 410 via the support member 430. Even as the insertion part 200 extends out of the sheath 100, the collar 410, support member 430, fixing ring 440, and flexible sheath 420 move synchronously with the insertion part 200. The main load-bearing components are also the collar 410, support member 430, and fixing ring 440, preventing the flexible sheath 420 from being stretched at both ends, which would affect the connection stability between the fixing ring 440 and the collar 410, and also preventing air leakage from the cavity formed between the flexible sheath 420 and the insertion part 200.

[0049] The retaining ring 440 can be sleeved on the outside of the sheath 100 or installed inside the sheath 100. In some preferred embodiments of this application, a mounting cavity 110 is provided on the distal end face of the sheath 100, which can be referred to... Figure 6 As shown. The retaining ring 440 is located in the mounting cavity 110 and moves within the mounting cavity 110, with the mounting cavity 110 restricting the movement path and direction of the retaining ring 440. The proximal end of the flexible sheath 420 fixed to the retaining ring 440 is also located within the mounting cavity 110.

[0050] The overall structure of the flexible component 400 can be referenced. Figure 5 As shown, the fixing ring 440, the collar 410 and the support member 430 are fixed to form a skeleton structure, and the flexible sleeve 420 is directly sleeved on the outside of the skeleton structure. The two ends of the flexible structure are fixed to the collar 410 and the fixing member, respectively. The flexible structure can be fixed to the support member 430 or not.

[0051] A flexible valve is provided at the opening of the mounting cavity 110, and the flexible valve is clamped on both sides of the flexible diaphragm 420 to seal the mounting cavity 110. The flexible valve mainly seals the mounting cavity 110, reducing the probability of external liquid entering the mounting cavity 110 and preventing external liquid from affecting the movement of the fixing ring 440 within the mounting cavity 110. At the same time, the presence of the flexible valve can also prevent the suction channel 300 from communicating with the external environment through the mounting cavity 110, thus avoiding any impact on the suction effect on the crushed stone.

[0052] The flexible valve is clamped on both sides of the flexible sleeve 420, sealing both mounting cavities 110 of the flexible sleeve 420. This also prevents the flexible sleeve 420 from directly rubbing against the inner wall of the mounting cavity 110, reducing the probability of wear and extending the service life of the flexible sleeve 420. The flexible valve can be made of materials such as silicone or rubber, and the edges of the flexible valve that contact the flexible sleeve 420 are chamfered or ground to reduce wear on the flexible sleeve 420.

[0053] In the use of the insertion assembly, after the insertion part 200 extends out of the sheath 100, the flexible diaphragm 420 subsequently extends out of the mounting cavity 110. (See reference...) Figures 1 to 4 As shown. When the insertion part 200 is not protruding from the sheath 100, the flexible diaphragm 420 is located in the mounting cavity 110, as can be seen from the diagram. Figure 7 and Figure 8 As shown, the flexible sheath 420 is located inside the sheath 100 at this time, so as to prevent the flexible component 400 from affecting the process of inserting the sheath 100 into the human body cavity.

[0054] This application also provides an suction sheath, which includes the sheath assembly of any of the above embodiments. See also... Figure 10 As shown, the suction sheath also includes a sheath body 600, and the proximal end of the sheath tube 100 is connected to the sheath body 600. When the negative pressure suction sheath is in use, the sheath body 600 is connected to the negative pressure source. When the insertion part 200 is used in conjunction with the negative pressure suction sheath, the insertion part 200 is sequentially inserted into the sheath body 600 and the sheath tube 100.

[0055] This application embodiment also provides an insertion component, including the sheath assembly provided in any of the above embodiments, and further including an insertion part 200, the insertion part 200 passing through the sheath 100, and a flexible sheath 420 sleeved outside the insertion part 200, with the distal end of the flexible sheath 420 fixedly sleeved outside the insertion part 200.

[0056] The flexible component 400 also includes a collar 410, which is fixed between the flexible sheath 420 and the insertion portion 200. That is, the collar 410 is fixed at the distal end of the flexible sheath 420 and simultaneously fixedly sleeved at the distal end of the insertion portion 200, and there is a gap between the inner peripheral wall of the collar 410 and the outer peripheral wall of the insertion portion 200:

[0057] In some embodiments, the collar 410 may be coaxially arranged with the insertion portion 200, and the collar 410 and the insertion portion 200 may be fixedly connected by a connector. In other embodiments, the insertion portion 200 and the collar 410 are eccentrically arranged, as can be seen in the following embodiments. Figure 3As shown, the insertion part 200 is not located at the center of the collar 410, but is offset to one side, which can concentrate the gap between the insertion part 200 and the collar 410. Compared with the two being coaxially arranged, larger gravel can be used, reducing the probability of gravel clogging the suction channel 300 and improving the adsorption effect on gravel.

[0058] The collar 410 can also be fixedly connected to the side wall of the collar 410. With this structure, there is no need to provide an additional connector between the collar 410 and the insertion part 200, thus avoiding the situation where the connector separates the gap between the collar 410 and the insertion part 200.

[0059] With the collar 410 and the insertion part 200 eccentrically positioned, the instrument channel 210 is located on the side of the insertion part 200 closer to the collar 410. (See reference [link to relevant documentation] for details.) Figure 3 and Figure 4 As shown. After the liquid is injected from the instrument channel 210, it is separated from the suction channel 300 by a certain distance and will not be directly adsorbed into the suction channel 300. The liquid can stay outside the instrument channel 210 to cool the stones, and can also carry fragments of stones into the suction channel 300 during the flow.

[0060] With the collar 410 and the insertion part 200 eccentrically arranged, the instrument channel 210 is located on the side of the insertion part 200 away from the collar 410. The inlet distance between the instrument channel 210 and the suction channel 300 is closer, which is conducive to quickly removing stones and improving response efficiency.

[0061] In some embodiments, when the flexible assembly 400 further includes a support member 430, the insertion portion 200 is eccentrically positioned with the collar 410, and the insertion portion 200 is fixedly connected to the sidewall of the collar 410. The support member 430 is located on the side of the collar 410 away from the insertion portion 200. Due to the eccentric positioning of the insertion portion 200, a portion of the peripheral sidewall of the insertion portion 200 near the collar 410 can provide support for the flexible sheath 420, while the support member 430 supports the other side of the flexible sheath 420, minimizing the number of support members 430. The fewer the number of support members 430, the less resistance the insertion portion 200 experiences during bending after extending out of the sheath 100, and the smoother the movement of the insertion portion 200 within the renal calyx.

[0062] This application also provides an endoscope assembly, which can be referred to in the embodiments. Figure 10 As shown, the endoscope assembly includes the insertion component provided in any of the above embodiments.

[0063] In some embodiments, the endoscope assembly also includes a handle 500, with the proximal ends of the sheath 100 and the insertion portion 200 both mounted on the handle 500, as can be seen in reference. Figure 9As shown, the sheath 100 and the handle 500 move synchronously. By controlling the position of the handle 500, the sheath 100 and the insertion part 200 are simultaneously inserted into the human body cavity.

[0064] In other embodiments, the endoscope assembly further includes a handle 500 and a sheath 600, with the proximal end of the sheath 100 communicating with the sheath 600. The sheath 600 is used to connect to a negative pressure source, and the proximal end of the insertion part 200 is mounted on the handle 500. The sheath 100 is part of a negative pressure suction sheath and communicates with the sheath 600. In use, the insertion part 200 is sequentially inserted into the sheath 600 and the sheath 100, with the distal end of the insertion part 200 fixed to a collar 410 at the distal end of the sheath 100. The insertion part 200 and the sheath 100 are simultaneously inserted into the human body cavity.

[0065] The endoscopes involved in the embodiments provided in this application can be pyeloscopes, bronchoscopes, esophagoscopes, gastroscopes, colonoscopes, otoscopes, rhinoscopes, oral endoscopes, laryngoscopes, colposcopes, laparoscopes, arthroscopes, etc. The embodiments of this application do not specifically limit the types of endoscopes.

[0066] 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.

[0067] 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 assembly, characterized in that, An application to a negative pressure suction sheath, comprising a sheath tube (100) and a flexible component (400), the flexible component (400) being mounted at the distal end of the sheath tube (100); The flexible component (400) includes a flexible sheath (420) for being fitted onto the insertion portion (200) of an endoscope that passes through the sheath (100). The proximal end of the flexible sheath (420) is connected to the sheath (100), and the distal end of the flexible sheath (420) is used to fix the sheath to the distal end of the insertion portion (200) of the endoscope that passes through the sheath (100). The flexible sheath (420) can form a fluid channel with the outer peripheral wall of the insertion portion (200). The distal end of the flexible sheath (420) can move relative to the sheath (100) under the drive of the insertion part (200), and the flexible sheath (420) can adapt to the bending action of the insertion part (200). The flexible component (400) further includes a retaining ring (440), which is movably engaged with and coaxially arranged with the sheath (100), and the proximal end of the flexible sheath (420) is fixed to the retaining ring (440).

2. The sheath assembly according to claim 1, characterized in that, The flexible component (400) further includes a collar (410), which is fixed to the distal end of the flexible sheath (420) and used to be fixedly sleeved onto the distal end of the insertion part (200). There is a gap between the inner peripheral wall of the collar (410) and the outer peripheral wall of the insertion part (200). And / or, the flexible sheath (420) is a corrugated tube structure.

3. A sheath assembly according to claim 2, characterized in that, The flexible component (400) further includes a support (430), the distal end of which is fixed to the collar (410), and the proximal end of which is movably engaged with the sheath (100). The support (430) is used to support the flexible sheath (420) to prevent the flexible sheath (420) from deforming toward its axial position.

4. A sheath assembly according to claim 3, characterized in that, The support member (430) is fixed to the retaining ring (440) at its proximal end. And / or, the support (430) is a sheet-like structure or a filament-like structure extending along the axis of the sheath (100).

5. A sheath assembly according to claim 4, characterized in that, The distal end face of the sheath (100) is provided with an installation cavity (110), the fixing ring (440) is located in the installation cavity (110), and a flexible valve is provided at the opening of the installation cavity (110). The flexible valve is clamped on both sides of the flexible sheath (420) to seal the installation cavity (110).

6. An attraction sheath, characterized in that, Includes the sheath assembly as described in any one of claims 1-5.

7. An insertion component, characterized in that, The sheath assembly according to any one of claims 1-5 further includes an insertion portion (200) that passes through the sheath (100), and a flexible sheath (420) that is sleeved outside the insertion portion (200), the distal end of which is fixedly sleeved on the insertion portion (200).

8. An insertion component according to claim 7, characterized in that, The flexible component (400) further includes a collar (410) fixed between the flexible sheath (420) and the insertion portion (200), wherein there is a gap between the inner peripheral wall of the collar (410) and the outer peripheral wall of the insertion portion (200): The insertion part (200) is eccentrically disposed with the collar (410); and / or, the insertion part (200) is fixedly connected to the side wall of the collar (410).

9. An insertion component according to claim 8, characterized in that, When the insertion part (200) has an instrument channel (210), and the insertion part (200) is eccentrically disposed with respect to the collar (410): The instrument channel (210) is located on the side of the insertion part (200) closer to the collar (410); and / or, the instrument channel (210) is located on the side of the insertion part (200) away from the collar (410).

10. An endoscope assembly, characterized in that, Includes the insertion component as described in any one of claims 7-9.

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