Negative pressure suction sheath and negative pressure suction assembly

Abstract

The invention discloses a negative pressure suction sheath and a negative pressure suction assembly, and relates to the technical field of medical instruments, the negative pressure suction sheath comprises an insertion tube and a sealing element, the insertion tube is internally provided with a containing channel, the sealing element is arranged in the insertion tube, and the sealing element is in sealing fit with the insertion tube and can block the containing channel. The insertion tube can be inserted into the human body, such as kidney and bladder. The sealing piece can isolate the containing channel of the insertion pipe from the external environment, and the insertion pipe is communicated with the ureter and extends to the kidney. At the moment, the sealing piece can prevent the containing channel of the insertion tube from being directly communicated with the outside, so that the pressure in a cavity and organs is effectively maintained, the pressure change amplitude and range of the kidney are reduced, the pressure change in the organs such as the kidney and the like is stabilized, and the probability that the kidney mucosa bleeding due to the pressure change is effectively reduced. Therefore, the onset risk of complications is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a negative pressure suction sheath and a negative pressure suction assembly. BACKGROUND

[0002] As one of the important medical devices in modern urological surgery, the ureteral sheath can establish a passage in the human body cavity so as to send endoscopes and other devices into the urinary tract for diagnosis and treatment. In the case of solving the disease of stone blocking the upper segment of the ureter, the existing ureteral sheath is inserted into the ureter and punches through the upper segment of the ureter, which causes bleeding of the renal mucosa and other serious complications. SUMMARY

[0003] In view of the above-mentioned shortcomings of the related art, the present application provides a negative pressure suction sheath and a negative pressure suction assembly to solve the above technical problems.

[0004] The present application provides a negative pressure suction sheath, which comprises an insertion tube and a sealing piece. The insertion tube has a containing channel therein. The sealing piece is arranged on the insertion tube and sealingly cooperates with the insertion tube and can block the containing channel.

[0005] To achieve the above-mentioned purposes and other related purposes, the present application provides a negative pressure suction assembly, which comprises the above-mentioned negative pressure suction sheath and an endoscope. The endoscope has an insertion part which can be inserted into the negative pressure suction sheath.

[0006] The technical scheme adopted by the present application can achieve the following beneficial effects: the insertion tube can be inserted into the human body, such as the kidney, the bladder, etc. The sealing piece can isolate the containing channel of the insertion tube from the external environment. The insertion tube leads through the ureter and extends to the kidney. At this time, the sealing piece can avoid the containing channel of the insertion tube from being directly connected to the outside, thereby effectively maintaining the pressure in the human body cavity and organs, reducing the range and amplitude of the pressure change in the kidney and other organs, and being conducive to stabilizing the pressure change in the kidney, thereby effectively reducing the probability of bleeding of the renal mucosa due to pressure change, and thereby reducing the risk of complications. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0008] Figure 1 is a structural schematic diagram of the negative pressure suction sheath shown in an exemplary embodiment of the present application; Figure 2is a cross-sectional view of an insertion tube and a dilator according to an example embodiment of the present application; Figure 3 is a cross-sectional view of a negative pressure suction sheath according to an example embodiment of the present application; Figure 4 is a cross-sectional view of a negative pressure suction sheath according to an example embodiment of the present application; Figure 5 is a cross-sectional view of a negative pressure suction sheath according to an example embodiment of the present application; Figure 6 is a cross-sectional view of an insertion tube and a dilator according to an example embodiment of the present application; Figure 7 is a cross-sectional view of an insertion tube according to an example embodiment of the present application; Figure 8 is a cross-sectional view of an insertion tube and an insertion portion according to an example embodiment of the present application; Figure 9 is a cross-sectional view of an insertion tube and an insertion portion according to an example embodiment of the present application; Figure 10 is a cross-sectional view of an insertion tube and a dilator according to an example embodiment of the present application; Figure 11 is a cross-sectional view of an insertion tube and a dilator according to an example embodiment of the present application; Figure 12 is a cross-sectional view of an insertion tube and a dilator according to an example embodiment of the present application; Figure 13 is a cross-sectional view of an insertion tube and a dilator according to an example embodiment of the present application; Figure 14 is a cross-sectional view of an insertion tube and a dilator according to an example embodiment of the present application; Figure 15 is a cross-sectional view of an insertion tube and a dilator according to an example embodiment of the present application; Figure 16 is a cross-sectional view of an insertion tube and a dilator according to an example embodiment of the present application;

[0009] In the figure: 1, negative pressure suction assembly; 100, negative pressure suction sheath; 110, insertion tube; 111, protruding part; 1111, first protruding part; 1112, second protruding part; 112, negative pressure suction channel; 113, containing channel; 114, second groove; 120, sealing piece; 121, distal end section; 122, proximal end section; 123, placement channel; 130, negative pressure pipeline; 200, dilator; 210, first groove; 211, first sub-groove; 212, second sub-groove; 213, first section; 214, second section; 300, endoscope; 310, insertion part; 320, lead-through channel; 330, instrument channel. DETAILED DESCRIPTION

[0010] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0011] The terms "first", "second", and the like 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 interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0012] In the embodiments of the present application, "proximal end" and "distal end" refer to the relative position of each component to the user in the use environment, wherein the end closer to the user is designated as "proximal end", and the end farther away from the user is designated as "distal end".

[0013] The existing ureteral sheath is inserted into the ureter and opens the upper segment of the ureter, which indirectly causes renal mucosal bleeding and other phenomena, thereby causing more serious complications. Based on the symptoms of clinical manifestations, the conclusion of medical personnel after the operation is that medical personnel made a wrong operation or an unavoidable operation during the operation, thereby causing the sheath tube or endoscope to rub against the renal mucosa, causing mucosal bleeding and other phenomena.

[0014] However, the applicant found in the process of implementing the present application that mucosal bleeding and other phenomena would occur in the middle of the operation, at which time the sheath and endoscope were not yet placed in the kidney. Therefore, the mucosal bleeding phenomenon is not entirely due to the sheath or endoscope rubbing against the renal mucosa. This is because after the upper segment of the ureter is blocked by a stone, the pressure inside the kidney increases. The ureteral sheath opens the upper segment of the ureter, and the ureteral sheath causes the pressure inside the kidney to drop suddenly, causing the renal mucosa to bleed due to the sudden pressure drop, thereby causing more serious complications.

[0015] The present application provides a negative pressure suction sheath 100, please refer to Figure 1 The negative pressure suction sheath 100 can include an insertion tube 110 and a sealing member 120, and the sealing member 120 is connected to the insertion tube 110.

[0016] Please refer to Figure 2 The insertion tube 110 has a containing channel 113 therein, and the insertion tube 110 can be a hollow tubular structure. The insertion tube 110 can suck or discharge pure water, physiological saline, etc., without limitation. The insertion tube 110 can be inserted into the human body, such as the kidney, the bladder, etc.

[0017] Please refer to Figure 2 The sealing member 120 can be made of a flexible material. For example, the material of the sealing member 120 can be, but is not limited to, rubber, silicone, polyurethane (TPU), thermoplastic elastomer (TPE), foam material, and bio-based flexible material, etc. The sealing member 120 is arranged on the insertion tube 110, and the sealing member 120 is sealingly connected with the insertion tube 110 and can block the containing channel 113. The sealing member 120 can isolate the containing channel 113 of the insertion tube 110 from the external environment. The insertion tube 110 can extend along the ureter to the kidney. At this time, the sealing member 120 can prevent the containing channel 113 of the insertion tube 110 from directly connecting the kidney with the external environment.

[0018] For some diseases, especially some diseases in which stones block the upper segment of the ureter, the pressure inside the kidney is relatively high. For this type of disease, if the kidney is directly connected with the external environment, the pressure inside the kidney can easily decrease rapidly due to the discharge of liquid, thereby easily causing the renal mucosa to bleed. In the above embodiment, the sealing member 120 is arranged to directly connect the kidney with the external environment during the insertion of the insertion tube 110, thereby being beneficial to maintaining the pressure of the insertion containing channel 113 and the kidney, reducing the range and amplitude of the change in the pressure of the kidney, being conducive to ensuring the pressure change of the kidney to be smooth, and effectively reducing the probability of the renal mucosa bleeding due to the change in the pressure, thereby reducing the risk of complications.

[0019] In some embodiments, the sealing state of the sealing member 120 can be adjusted, which can be used to control the flow rate of the liquid in the kidney through the sealing member 120. For example, the sealing member 120 can be gradually opened relative to the insertion tube 110. Specifically, during the gradual opening of the sealing member 120, the liquid in the kidney can slowly pass through the sealing member 120 and / or the gap between the sealing member 120 and the insertion tube 110. In this way, after the insertion tube 110 is extended along the ureter to the kidney, the speed of the liquid in the kidney can be controlled by adjusting the sealing state of the sealing member 120, so that the pressure in the kidney can be slowly released, thereby avoiding the sudden drop of the pressure in the kidney.

[0020] In the embodiments of the present application, please refer to Figure 3 and Figure 4 The insertion tube 110 is adapted to accommodate an instrument, which includes but is not limited to an endoscope 300, without limitation. The instrument can be extended from the accommodation channel 113 and through the sealing member 120. The sealing member 120 has a first state and a second state, and the state of the sealing member 120 can be switched under the action of external force or internal force. Please refer to Figure 3 When the sealing member 120 is in the first state, the sealing member 120 forms an insertion channel 123 and sealingly cooperates with the instrument located in the insertion channel 123. As shown in Figure 5 and Figure 6 , at this time, the inner wall of the sealing member 120 closely abuts the surface of the instrument located in the insertion channel 123, and a sealing cooperation is formed therebetween. This not only allows the instrument to smoothly pass through the insertion hole and enter the predetermined position, but also prevents the sudden drop of the pressure caused by the rapid outflow of the fluid from the body cavity during the penetration of the instrument. Please refer to Figure 4 When the sealing member 120 is in the second state, the insertion channel 123 is closed to prevent the fluid from flowing from the insertion channel 123 into the accommodation channel 113. At this time, after the instrument is withdrawn from the insertion channel 123, the formed insertion channel 123 is automatically closed, and the sealing member 120 is switched to the closed state. This closure can block the path through which the fluid may leak outward through the instrument insertion part, thereby preventing the massive leakage of the fluid and improving the safety in use.

[0021] In one embodiment, please refer to Figure 2 The sealing member 120 is arranged at the distal end of the insertion tube 110. When the instrument is inserted into or withdrawn from the insertion tube 110, the sealing member 120 located at the distal end can abut the surface of the instrument, thereby effectively isolating the distal end of the insertion tube 110 and preventing the fluid in the insertion tube 110 from overflowing outward from the distal opening. During the withdrawal of the instrument into the insertion tube 110, this arrangement can prevent a large amount of fluid from flowing from the body organ or cavity into the insertion tube 110, thereby reducing the risk of sudden drop of the pressure in the body organ or cavity and improving the safety in use of the negative pressure suction sheath 100.

[0022] In some embodiments, the instrument is fitted with a gap with the insertion tube 110. In this way, as the instrument is continuously pulled out, the instrument can be separated from the seal 120 at the distal end, and the resistance of the instrument to the seal 120 disappears at the initial stage of the instrument being pulled out, facilitating the instrument to be pulled out more smoothly. In addition, the gap between the instrument and the insertion tube 110 allows the gas outside the insertion tube 110 to reach the insertion tube 110 inside the instrument at the distal end of the instrument through the gap between the insertion tube 110 and the instrument, which is beneficial to avoid the formation of negative pressure in the insertion tube 110 between the seal 120 and the distal end of the instrument, and further beneficial to reduce the resistance of the instrument being pulled out.

[0023] In another embodiment, the seal 120 is arranged in the accommodation channel 113 of the insertion tube 110, and the accommodation channel 113 is a space for fluid to flow in the insertion tube 110. Arranging the seal 120 in the accommodation channel 113 can form an obstruction on the fluid flow path. This arrangement can reduce the risk of sudden pressure drop in the human organ or cavity. In addition, the seal 120 is arranged in the accommodation channel 113, which can avoid the seal 120 from being scratched or worn by the human cavity during the insertion of the insertion tube 110 into the human body, which is beneficial to ensure the safety of the use of the negative pressure suction sheath 100.

[0024] In another embodiment, the seal 120 is arranged at the distal end of the insertion tube 110, and the seal 120 is arranged in the accommodation channel 113 of the insertion tube 110, i.e. the seal 120 is arranged at the distal end of the accommodation channel 113 of the insertion tube 110, which further reduces the risk of sudden pressure drop in the human organ or cavity, which will not be described here.

[0025] In the embodiments of the present application, please refer to Figure 2The sealing member 120 can be a hollow tubular flexible film. The flexible film is light and thin, and is easy to deform. The proximal end of the sealing member 120 is in alignment with the insertion tube 110, so that the sealing member 120 is in communication with the accommodation channel 113. This allows the space inside the sealing member 120 to be in full communication with the accommodation channel 113 of the insertion tube 110, so that the instrument can smoothly enter the human body from the accommodation channel 113 of the insertion tube 110. The sealing member 120 can be folded towards the direction of the central axis of the sealing member 120 and block the accommodation channel 113 under the action of external pressure and / or its own elasticity. When external pressure acts on the sealing member 120 or the sealing member 120 generates its own elasticity, the sealing member 120 will naturally fold towards the direction of the central axis of the sealing member 120 due to the material properties of the flexible film, thereby blocking the accommodation channel 113. This folding action driven by the material properties of the sealing member 120 and external or internal forces allows the sealing member 120 to closely fit the outer surface of the instrument during the folding process when the instrument is inserted into the insertion tube 110. The deformation of the flexible film seals the gap between the instrument and the sealing member 120, thereby achieving a sealed fit between the two, and preventing fluid from leaking out of the gap. When the instrument is not inserted, the sealing member 120 can be fully folded to block the accommodation channel 113, thereby isolating the accommodation channel 113 of the insertion tube 110 from the external environment, preventing fluid leakage from the tube and external contaminants from entering. The sealing member 120 can effectively isolate the accommodation channel 113 and the human body cavity, thereby effectively improving the safety of the negative pressure suction sheath 100.

[0026] In the embodiments of the present application, referring to Figure 5 and Figure 6 The sealing member 120 can include a distal end section 121 and a proximal end section 122. The distal end section 121 is connected to the distal end of the proximal end section 122, and the proximal end section 122 is connected to the distal end of the insertion tube 110. The film thickness of the distal end section 121 is less than that of the proximal end section 122. In one case, the thickness of the sealing member 120 gradually increases from the distal end to the proximal end, which can make the film thickness of the proximal end section 122 the same as that of the distal end section 121. In another case, the overall thickness of the distal end section 121 remains unchanged, and the overall thickness of the proximal end section 122 also remains unchanged. The average film thickness of the distal end section 121 is less than that of the proximal end section 122, which can make the film thickness of the sealing member 120 change in stages. The difference in film thickness makes the distal end of the sealing member 120 more likely to deform and fold towards the deformation direction, thereby forming a tighter sealed fit between the sealing member 120 and the instrument and ensuring the sealing effect. Further, compared to the proximal end of the sealing member 120, the distal end of the sealing member 120 is more likely to fold towards the inside, which can make the inside of the sealing member 120 in the second state form a conical space. When the instrument or the dilator 200 is inserted into the sealing member 120, the inner wall of the sealing member 120 can guide the instrument or the dilator 200 to move towards the central axis, thereby preventing the instrument or the dilator 200 from scratching the sealing member 120 and improving safety.

[0027] In addition, along the direction from the distal end to the proximal end of the seal 120, please refer to Figure 5 The inner diameter of the seal 120's cross-section gradually decreases. Furthermore, the seal 120 has a hollow frustum shape, further enhancing the tendency of its distal end to converge inwards, allowing for a stable seal between the seal 120 and the instrument or dilator 200. This also creates a conical space inside the seal 120, guiding the instrument or dilator 200 towards its central axis, preventing it from scraping against the seal 120, and improving the ease of insertion of the instrument or dilator 200 into the insertion tube 110, thus enhancing usability and installation.

[0028] In the embodiments of this application, please refer to Figure 5 as well as Figure 6 The negative pressure suction sheath 100 may further include an expander 200, which is used to support or guide the negative pressure suction sheath 100. The expander 200 is movably disposed in the receiving channel 113, and the negative pressure suction sheath 100 can switch between a third state and a fourth state. When the negative pressure suction sheath 100 is in the third state, the insertion tube 110 and / or the seal 120 are sealed with the expander 200 and block the receiving channel 113, ensuring the sealing of the receiving channel 113 and preventing fluid from flowing to the proximal end of the insertion tube 110, which would cause a sudden drop in pressure. For ease of reference and distinction, the two different states of the negative pressure suction sheath 100 are described as the third state and the fourth state, to distinguish them from the first and second states of the seal 120. When the negative pressure suction sheath 100 is in the fourth state, there is a gap between the dilator 200 and the insertion tube 110 that connects the proximal and distal ends of the insertion tube 110. At this time, the seal 120 has closed the receiving channel 113. The gap can connect the proximal end of the dilator 200, which can avoid direct connection to the human body cavity to avoid a sudden drop in pressure. At the same time, the gap can prevent the formation of negative pressure between the distal end of the dilator 200 and the seal 120, making it easier for the dilator 200 to be pulled out.

[0029] The instrument surface may cause friction with the seal 120, potentially dislodging the seal 120 from its original position. In this embodiment, please refer to... Figure 7The inner wall of the insertion tube 110 is provided with a protrusion 111 extending to the distal end surface of the insertion tube 110. The protrusion 111 can directly abut against the surface of the instrument at the distal end surface of the insertion tube 110, and when the sealing member 120 is taken away by the instrument or the dilator 200, the protrusion 111 can block and separate the sealing member 120 on the surface of the instrument. The sealing member 120 on the surface of the instrument is separated from the surface of the instrument or the dilator 200, and the tendency of the sealing member 120 moving to the proximal end of the insertion tube 110 with the instrument or the dilator 200 is eliminated, so that the sealing member 120 is effectively prevented from being taken away from the matching position, and the stable sealing and matching relationship between the sealing member 120, the insertion tube 110 and the instrument is ensured, and the safety in use is improved.

[0030] In an embodiment, referring to Figure 6 When the instrument is inserted into the insertion tube 110, the protrusion 111 can contact the outer surface of the instrument. For example, when the insertion part 310 of the endoscope 300 is inserted into the insertion tube 110, the protrusion 111 can contact the outer surface of the instrument, and the instrument can be stably installed in the insertion tube 110 by limiting the abutment of the instrument, so that the instrument is prevented from shaking or twisting in the insertion tube 110, and the safety in use is improved. Further, when the insertion part 310 of the endoscope 300 is located in the accommodation channel 113, the protrusion 111 can abut against the insertion part 310, so that the insertion part 310 is biased relative to the insertion tube 110, one side of the insertion part 310 is attached to the inner wall of the insertion tube 110, and the other side forms a space, which facilitates the discharge of substances.

[0031] Further, the endoscope 300 can include an insertion part 310 that can be inserted into the accommodation channel 113, and the insertion tube 110 and the insertion part 310 are matched with each other, that is, the inner diameter of the insertion tube 110 is greater than or equal to the outer diameter of the insertion part 310. When the insertion part 310 is located in the accommodation channel 113, the protrusion 111 can abut against the insertion part 310, so that the insertion part 310 is biased relative to the insertion tube 110. Further, the protrusion 111 can abut against the insertion part 310, so that the movement space of the insertion part 310 in the insertion tube 110 is reduced, and the insertion part 310 is relatively fixed in the insertion tube 110, so that the continuous movement of the insertion part 310 does not affect the use precision of the endoscope 300, and the operation feeling is improved. In addition, in some other cases, when the insertion part 310 is located in the accommodation channel 113, the protrusion 111 can abut against the insertion part 310, so that the insertion part 310 is biased relative to the insertion tube 110, one side of the insertion part 310 is attached to the inner wall of the insertion tube 110, and the other side forms a larger space, which facilitates the discharge of substances.

[0032] In the embodiment of the present application, referring to Figure 9The number of the protrusions 111 is at least two, such as 2, 3, and the like, and is not limited. The at least two protrusions 111 are distributed along the circumference of the insertion tube 110, and the at least two protrusions 111 include a first protrusion 1111 and a second protrusion 1112. The first protrusion 1111 and the second protrusion 1112 can simultaneously abut against the insertion part 310, so that one side of the insertion part 310 is attached to the inner wall of the insertion tube 110, and the other side forms a negative pressure suction channel 112, which is more conducive to the discharge of the material. Compared with the single protrusion 111 limiting cooperation, the first protrusion 1111 and the second protrusion 1112 simultaneously act on the insertion part 310, which can form a larger and more concentrated space on one side of the insertion part 310, and the space is formed between the first protrusion 1111 and the second protrusion 1112, avoiding the space being separated by the protrusion 111.

[0033] Preferably, along the axial direction of the insertion tube 110, the protrusion 111 extends from the distal end of the insertion tube 110 to the proximal end of the insertion tube 110. When the instrument is inserted into the insertion tube 110, the protrusion 111 abuts against the outer surface of the instrument or the dilator 200. By abutting against the instrument, the protrusion 111 limits the instrument, so that the instrument can be stably installed in the insertion tube 110, avoids the bending and deformation of the instrument or the dilator 200, improves the insertion consistency of the negative pressure suction sheath 100, and optimizes the insertion effect.

[0034] In the embodiments of the present application, please refer to Figure 10 The outer surface of the dilator 200 is provided with a first groove 210, and the protrusion 111 can be embedded in the first groove 210 when the dilator 200 is inserted into the insertion tube 110. The protrusion 111 can limit the rotation of the dilator 200 relative to the insertion tube 110, improve the consistency of the dilator 200 and the insertion tube 110 when inserted into the human body, avoid the relative movement between the dilator 200 and the insertion tube 110, and affect the smooth insertion of the insertion tube 110, and improve the safety in use.

[0035] Further, please refer to Figure 11, the inner wall of the insertion tube 110 has a second groove 114, which extends from the proximal end of the insertion tube 110 to the distal end of the insertion tube 110, in the case that the negative pressure suction sheath 100 is in the third state, the dilator 200 is in sealing cooperation with the sealing member 120, and the sealing member 120 blocks the accommodation channel 113. In the case that the negative pressure suction sheath 100 is in the fourth state, the dilator 200 extends into the interior of the insertion tube 110 and is separated from the sealing member 120, and the sealing member 120 seals the insertion tube 110. For the sake of understanding and distinction, the third state and the fourth state are set as two different states of the negative pressure suction sheath 100, which are distinguished from the first state and the second state of the sealing member 120. For example, in the process of switching the negative pressure suction sheath 100 from the third state to the fourth state, the sealing member 120 can seal the distal end of the insertion tube 110 under the action of external pressure. The dilator 200 can be in sealing cooperation with the interior of the insertion tube 110 in the initial stage of being pulled out of the insertion tube 110, but as the dilator 200 is pulled out, the space increases, which can form a negative pressure at the distal end of the dilator 200, and the negative pressure can drive the sealing member 120 to contract inwardly, so as to realize the sealing effect of the sealing member 120 sealing the insertion tube 110, that is, the sealing member 120 can be switched from the first state to the second state. At this time, the dilator 200 and the insertion tube 110 form a gap through the second groove 114, which communicates the proximal end and the distal end of the insertion tube 110, and the gap can balance the negative pressure at the distal end of the insertion tube 110, so as to avoid the negative pressure hindering the dilator 200 from being pulled out. The dilator 200 can be quickly pulled out, and the negative pressure does not further interfere with or damage the sealing member 120, which is beneficial to improve the operation efficiency. This setting can avoid the sudden drop of the pressure in the human body cavity, facilitate the dilator 200 to be pulled out, and maintain the sealing effect of the sealing member 120.

[0036] In an embodiment, referring to Figure 12 , the first groove 210 includes a first section 213 and a second section 214, the first section 213 communicates with the distal end of the second section 214, the groove width of the first section 213 is equal to the width of the protruding part 111, and the groove width of the second section 214 is greater than the width of the protruding part 111. In the case that the negative pressure suction sheath 100 is in the fourth state, the protruding part 111 moves into the second section 214 relative to the insertion tube 110, and a gap is formed between the protruding part 111 and the groove wall of the first groove 210, which communicates the proximal end and the distal end of the insertion tube 110. This ensures that when the protruding part 111 moves into the second section 214, the gap formed between the protruding part 111 and the second section 214 can communicate the proximal end and the distal end of the insertion tube 110, and further ensures that the dilator 200 will not be hindered by the negative pressure when being pulled out.

[0037] In another embodiment, referring to Figure 13The number of the first grooves 210 is at least two, such as 2, 3, and the like, without limitation. The number of the first grooves 210 is greater than the number of the protrusions 111, and each of the protrusions 111 can be embedded in the first groove 210. In the case that the dilator 200 is inserted into the insertion tube 110, the first groove 210 can at least communicate with the proximal end of the insertion tube 110. The protrusion 111 can be embedded in the first groove 210, and the first groove 210 can at least communicate with the proximal end of the insertion tube 110 when the dilator 200 is inserted into the insertion tube 110. This can reduce the friction between the dilator 200 and the insertion tube 110, and make the dilator 200 more smoothly pulled out.

[0038] In another embodiment, referring to Figure 14 The at least two first grooves 210 can include a first sub-groove 211 and a second sub-groove 212. The first sub-groove 211 extends through the opposite ends of the dilator 200, and the protrusion 111 is embedded in the first sub-groove 211. The second sub-groove 212 extends to the proximal end of the dilator 200 and is isolated from the distal end of the dilator 200, so that the distal end side of the dilator 200 can be sealingly matched with the insertion tube 110. The first sub-groove 211 extends through the opposite ends of the dilator 200, and the protrusion 111 is embedded therein to achieve stable matching. The second sub-groove 212 extends to the proximal end of the dilator 200 and is isolated from the distal end, so that the distal end side of the dilator 200 can be sealingly matched with the insertion tube 110. While ensuring the sealing effect, the second sub-groove 212 reduces the contact area between the dilator 200 and the insertion tube 110, reduces the friction, and is beneficial to the pulling out of the dilator 200.

[0039] Referring to Figure 1 and Figure 9 The negative pressure suction sheath 100 can further include a negative pressure pipeline 130. The negative pressure pipeline 130 is in communication with the insertion tube 110 and is adapted to communicate with a negative pressure source. The negative pressure source can be a negative pressure pump or the like, without limitation. The negative pressure pipeline 130 can provide negative pressure suction force for the accommodation channel 113. The negative pressure pipeline 130 is located on the side of the central axis of the insertion tube 110 close to the negative pressure suction channel 112 and is in communication with the negative pressure suction channel 112. The negative pressure pipeline 130 is in communication with the negative pressure suction channel 112 and is distributed along the axis. This arrangement can enable fluid or substances to be discharged along the axis from the negative pressure suction channel 112, reducing the flow path and improving the efficiency of the material discharge. The substances to be discharged can be stone particles or the like.

[0040] To achieve the above object and other related objects, the present application provides a negative pressure suction assembly 1, referring to Figure 15The negative pressure suction assembly 1 comprises the negative pressure suction sheath 100 and the endoscope 300, so that the negative pressure suction assembly 1 has the beneficial effects of any of the foregoing solutions, which will not be repeated here. Further, the endoscope 300 and the negative pressure suction sheath 100 are adapted to each other, and the endoscope 300 can have an insertion portion 310 which can be inserted into the negative pressure suction sheath 100.

[0041] Further, please refer to Figure 16 The insertion portion 310 has a conducting channel 320 and an instrument channel 330 which can be used for extracting fluid and injecting medium respectively, and the medium can be physiological saline or the like. The instrument channel 330 penetrates through opposite ends of the insertion portion 310, and the conducting channel 320 has opposite first and second openings which are spaced apart in the axial direction of the insertion portion 310. In the case where the insertion portion 310 penetrates through the sealing member 120, the fitting part between the sealing member 120 and the insertion portion 310 is located between the first and second openings. At this time, the sealing member 120 can be sealingly fitted with the outer wall of the insertion portion 310, and the conducting channel 320 can extract fluid and the material to be discharged, so that the insertion portion 310 can normally extract fluid and the material to be discharged, and the suction function of the negative pressure suction assembly 1 is ensured.

[0042] It should be noted that the terms "comprising", "containing", or any other similar term as used herein are intended to encompass a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements in the list, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0043] In addition, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order, for example, the described methods can be performed in an order different from that described, and various steps can be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0044] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A negative pressure suction sheath characterized by, The negative pressure suction sheath comprises an insertion tube with a containing channel inside and a sealing member arranged on the insertion tube, the sealing member is in sealing cooperation with the insertion tube and can block the containing channel.

2. The negative pressure suction sheath of claim 1, wherein, The insertion tube is suitable for containing an instrument which can be inserted into the containing channel and pass through the sealing member, the sealing member has a first state and a second state, when the sealing member is in the first state, the sealing member forms an implantation channel and is in sealing cooperation with the instrument located in the implantation channel, when the sealing member is in the second state, the implantation channel is closed to avoid fluid flowing from the implantation channel into the containing channel; And / or, the sealing member is arranged at the distal end of the insertion tube and / or in the containing channel; And / or, the sealing member is a hollow tubular flexible film, the proximal end of the sealing member is in mutual butt joint with the insertion tube, so that the sealing member and the containing channel are in mutual communication, and the sealing member can be folded towards the direction of the central axis of the sealing member and block the containing channel under the action of external pressure and / or its own elasticity.

3. The negative pressure suction sheath of claim 2, wherein, The sealing member comprises a distal end section and a proximal end section, the distal end section is connected with the distal end of the proximal end section, the proximal end section is connected with the distal end of the insertion tube, and the film thickness of the distal end section is smaller than that of the proximal end section; And / or, the inner diameter of the cross section of the sealing member gradually decreases in the direction from the distal end to the proximal end of the sealing member.

4. The negative pressure suction sheath according to claim 2 or 3, characterized in that, The inner wall of the insertion tube is provided with a protrusion which extends to the distal end face of the insertion tube; And / or, when the instrument is inserted into the insertion tube, the protrusion can be in contact with the outer surface of the instrument.

5. The negative pressure suction sheath of claim 4, wherein, The negative pressure suction sheath further comprises a dilator which is movably arranged in the containing channel, and the negative pressure suction sheath can be switched between a third state and a fourth state, when the negative pressure suction sheath is in the third state, the insertion tube and / or the sealing member are in sealing cooperation with the dilator and block the containing channel, when the negative pressure suction sheath is in the fourth state, the dilator has a gap between the proximal end and the distal end of the insertion tube; And / or, the instrument comprises an endoscope which comprises an insertion part which can be inserted into the containing channel, when the insertion part is located in the containing channel, the protrusion can abut against the insertion part to bias the insertion part relative to the insertion tube; And / or, in the axial direction of the insertion tube, the protrusion extends from the distal end of the insertion tube to the proximal end of the insertion tube.

6. The negative pressure suction sheath of claim 5, wherein, The outer surface of the dilator is provided with a first groove, when the dilator is inserted into the insertion tube, the protrusion can be embedded in the first groove; And / or, the inner wall of the insertion tube has a second groove, the second groove is through the insertion tube from the proximal end of the insertion tube to the distal end of the insertion tube, in the case of the negative pressure suction sheath in the first state, the dilator and the sealing piece are sealed and sealed, and the containing channel is blocked, in the case of the negative pressure suction sheath in the second state, the dilator and the insertion tube form a gap through the second groove.

7. The negative pressure suction sheath of claim 6, wherein, The first groove includes a first section and a second section, the first section is connected to the distal end of the second section, the groove width of the first section is equal to the width of the protruding part, and the groove width of the second section is greater than the width of the protruding part, in the case of the negative pressure suction sheath in the second state, the protruding part moves into the second section relative to the insertion tube, and a gap is formed between the protruding part and the groove wall of the first groove, which communicates the proximal end and the distal end of the insertion tube. And / or, the number of the first grooves is at least two, and the number of the first grooves is greater than the number of the protruding parts, and the protruding parts can be embedded in the first grooves, and the first grooves can at least communicate the proximal end of the insertion tube when the dilator is inserted into the insertion tube. And / or, the number of the protruding parts is at least two, and at least two of the protruding parts are distributed along the circumference of the insertion tube, and at least two of the protruding parts include a first protruding part and a second protruding part, and the first protruding part and the second protruding part can simultaneously abut the insertion part, so that one side of the insertion part is attached to the inner wall of the insertion tube, and the other side forms a negative pressure suction channel.

8. The negative pressure suction sheath of claim 7, wherein, At least two of the first grooves include a first sub-groove and a second sub-groove, the first sub-groove extends through the opposite ends of the dilator, the protruding part is embedded in the first sub-groove, and the second sub-groove extends to the proximal end of the dilator and is isolated from the distal end of the dilator, so that the distal end side of the dilator can be sealed with the insertion tube. And / or, the negative pressure suction sheath further comprises a negative pressure pipeline in communication with the insertion tube, the negative pressure pipeline is adapted to communicate with a negative pressure source and provide a negative pressure suction force for the containing channel, and the negative pressure pipeline is located on the side of the central axis of the insertion tube close to the negative pressure suction channel and communicates with the negative pressure suction channel.

9. A negative pressure suction assembly, characterized by, The negative pressure suction assembly comprises the negative pressure suction sheath of any one of claims 1-8 and an endoscope, and the endoscope has an insertion part which can be inserted into the negative pressure suction sheath.

10. The negative pressure suction assembly of claim 9, wherein, The insertion part has a guide channel and an instrument channel, the instrument channel extends through the opposite ends of the insertion part, the guide channel has a first opening and a second opening in communication, and the first opening and the second opening are distributed in the axial direction of the insertion part, and in the case that the insertion part penetrates the sealing piece, the fitting part between the sealing piece and the insertion part is located between the first opening and the second opening.

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