A negative pressure suction sheath and negative pressure suction assembly

Abstract

The application discloses a negative pressure suction sheath and a negative pressure suction assembly, and relates to the technical field of medical devices.The negative pressure suction sheath comprises an insertion tube and a sealing piece, the insertion tube is internally provided with an accommodating channel, the sealing piece is arranged on the insertion tube, the sealing piece is in sealing cooperation with the insertion tube, and the sealing piece can block the accommodating channel.The insertion tube can be inserted into the human body, such as a kidney, a urinary bladder and the like.The sealing piece can isolate the accommodating channel of the insertion tube from the external environment, the insertion tube is in communication with a ureter and extends to the kidney.At this time, the sealing piece can avoid the direct communication between the accommodating channel of the insertion tube and the external environment, thereby effectively maintaining the pressure in the cavity and the organ, reducing the amplitude and range of the pressure change of the kidney, being beneficial to the stabilization of the pressure change in the kidney and the like, effectively reducing the probability of the bleeding of the kidney mucosa due to the pressure change, and thereby reducing the incidence risk of complications.

Description

Technical Field

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

[0002] As an important medical device in modern urological surgery, the ureteral sheath creates a passage in the body cavity to allow endoscopes and other instruments to be inserted into the urinary tract for diagnosis and treatment. However, when addressing conditions such as stones obstructing the upper ureter, the insertion of the existing ureteral sheath into the ureter to open the blockage can cause renal mucosal bleeding and other serious complications. Summary of the Invention

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

[0004] This application provides a negative pressure suction sheath, which includes an insertion tube and a sealing element. The insertion tube has a receiving channel, and the sealing element is disposed in the insertion tube. The sealing element is in a sealing fit with the insertion tube and can block the receiving channel.

[0005] To achieve the above and other related objectives, this application provides a negative pressure suction assembly, which includes the aforementioned negative pressure suction sheath and endoscope. The endoscope has an insertion part that can be inserted into the negative pressure suction sheath.

[0006] The technical solution adopted in this invention achieves the following beneficial effects: the insertion tube can be inserted into the human body, such as the kidney or bladder. The sealing element isolates the insertion tube's receiving channel from the external environment, allowing the insertion tube to connect to the ureter and extend to the kidney. At this point, the sealing element prevents the insertion tube's receiving channel from directly communicating with the outside, thereby effectively maintaining pressure within the body cavities and organs, reducing the amplitude and range of pressure changes within organs such as the kidney, stabilizing kidney pressure changes, and effectively reducing the probability of renal mucosal bleeding due to pressure changes, thus lowering the risk of complications. Attached Figure Description

[0007] 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.

[0008] Figure 1 This is a schematic diagram of the structure of a negative pressure suction sheath, as shown in an exemplary embodiment of this application;

[0009] Figure 2 This is a schematic diagram illustrating the structure of the insertion tube and the sealing element in an exemplary embodiment of this application;

[0010] Figure 3 This is a cross-sectional view of a negative pressure suction sheath shown in an exemplary embodiment of this application;

[0011] Figure 4 This is a cross-sectional view of a negative pressure suction sheath in another state, as illustrated in an exemplary embodiment of this application;

[0012] Figure 5 This is a schematic diagram of another negative pressure suction sheath structure shown in an exemplary embodiment of this application;

[0013] Figure 6 This is a cross-sectional view of the insertion tube and dilator shown in an exemplary embodiment of this application;

[0014] Figure 7 This is a cross-sectional view of the insertion tube shown in an exemplary embodiment of this application;

[0015] Figure 8 This is a cross-sectional view of the insertion tube and insertion portion shown in an exemplary embodiment of this application;

[0016] Figure 9 This is a cross-sectional view of another insertion tube and insertion portion shown in an exemplary embodiment of this application;

[0017] Figure 10 This is a cross-sectional view of another insertion tube and dilator shown in an exemplary embodiment of this application;

[0018] Figure 11 This is a cross-sectional view of another insertion tube and dilator shown in an exemplary embodiment of this application;

[0019] Figure 12 This is a schematic diagram of the structure of the expander shown in an exemplary embodiment of this application;

[0020] Figure 13 This is a schematic diagram of another expander structure shown in an exemplary embodiment of this application;

[0021] Figure 14 This is a schematic diagram illustrating the structure of another expander, as shown in an exemplary embodiment of this application;

[0022] Figure 15 This is a schematic diagram of the structure of a negative pressure suction assembly shown in an exemplary embodiment of this application;

[0023] Figure 16 This is a schematic diagram illustrating the structure of the insertion part, insertion tube, and sealing member in an exemplary embodiment of this application.

[0024] In the diagram: 1. Negative pressure suction assembly; 100. Negative pressure suction sheath; 110. Insertion tube; 111. Protrusion; 1111. First protrusion; 1112. Second protrusion; 112. Negative pressure suction channel; 113. Receiving channel; 114. Second groove; 120. Seal; 121. Distal section; 122. Proximal section; 123. Insertion channel; 130. Negative pressure conduit; 200. Diverter; 210. First groove; 211. First sub-groove; 212. Second sub-groove; 213. First section; 214. Second section; 300. Endoscope; 310. Insertion part; 320. Conduction channel; 330. Instrument channel. Detailed Implementation

[0025] 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.

[0026] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, 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.

[0027] In the various embodiments of this application, "near end" and "far end" refer to the distance of each component from the user in the usage environment. The end closer to the user is designated as the "near end", and the end farther from the user is designated as the "far end".

[0028] The insertion of the existing ureteral sheath into the ureter and opening the upper ureter can indirectly cause renal mucosal bleeding, leading to serious complications. Based on the clinical symptoms, the medical staff concluded postoperatively that during the surgery, they made an error or an unavoidable procedure, causing the sheath or endoscope to rub against the renal mucosa, resulting in mucosal bleeding.

[0029] However, during the development of this invention, the applicant discovered that mucosal bleeding occurs in the pre-operative or mid-operative stage, before the sheath and endoscope are inserted into the kidney. Therefore, the mucosal bleeding is not entirely due to friction between the sheath or endoscope and the renal mucosa. This is because when the upper ureter is blocked by a stone, the pressure inside the kidney increases. When the ureteral sheath opens the upper ureter, it causes a sudden drop in pressure inside the kidney, leading to bleeding of the renal mucosa and potentially causing serious complications.

[0030] This application provides a negative pressure suction sheath 100, please refer to [link / reference]. Figure 1 The negative pressure suction sheath 100 may include an insertion tube 110 and a seal 120, with the seal 120 connected to the insertion tube 110.

[0031] Please see Figure 2 The insertion tube 110 has a receiving channel 113 inside. The insertion tube 110 can be a hollow tubular structure. The insertion tube 110 can aspirate or expel purified water, physiological saline, etc., without limitation. The insertion tube 110 can be inserted into the human body, such as the kidneys or bladder.

[0032] Please see Figure 2 The sealing element 120 can be made of a flexible material. For example, the material of the sealing element 120 can be, but is not limited to, rubber, silicone, polyurethane (TPU), thermoplastic elastomer (TPE), foam material, and bio-based flexible material. The sealing element 120 is disposed on the insertion tube 110, and the sealing element 120 seals against the insertion tube 110, blocking the receiving channel 113. The sealing element 120 isolates the receiving 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 element 120 can prevent the receiving channel 113 of the insertion tube 110 from directly connecting the kidney to the outside world.

[0033] For some conditions, especially those involving stones obstructing the upper ureter, the intrarenal pressure is high. In these cases, directly connecting the kidney to the outside environment can cause a rapid drop in intrarenal pressure due to fluid drainage, potentially leading to renal mucosal bleeding. In the above embodiment, the sealing element 120 allows direct connection between the kidney and the outside environment during insertion of the insertion tube 110. This helps maintain pressure in the insertion receiving channel 113 and the kidney, mitigating the amplitude and range of renal pressure fluctuations. This ensures stable renal pressure changes, effectively reducing the probability of renal mucosal bleeding due to pressure changes and thus lowering the risk of complications.

[0034] In some embodiments, the sealing state of the seal 120 is adjustable, which can be used to control the flow rate of fluid from the kidney through the seal 120. Exemplarily, the seal 120 can be progressively opened relative to the insertion tube 110. Specifically, during the progressive opening of the seal 120, fluid from the kidney can slowly permeate through the seal 120 and / or the gap between the seal 120 and the insertion tube 110. Thus, after the insertion tube 110 is extended along the ureter into the kidney, the rate of fluid outflow from the kidney can be controlled by adjusting the sealing state of the seal 120, thereby allowing the pressure within the kidney to be released slowly and preventing a sudden drop in kidney pressure.

[0035] In the embodiments of this application, please refer to Figure 3 as well as Figure 4 The insertion tube 110 is adapted to accommodate instruments, including but not limited to an endoscope 300. The instrument can extend through the receiving channel 113 and pass through the seal 120, which has a first state and a second state, and the state of the seal 120 can be switched under external force or its own internal force. See also... Figure 3 When the seal 120 is in the first state, the seal 120 forms an insertion channel 123 and seals with the instrument located within the insertion channel 123. For example... Figure 5 as well as Figure 6 As shown, at this time, the inner wall of the seal 120 will fit tightly against the surface of the instrument located within the insertion channel 123, forming a sealing fit. This allows the instrument to pass smoothly through the insertion hole and enter the predetermined position, while also preventing the rapid outflow of fluid from the body cavity during instrument penetration, thus avoiding a sudden drop in pressure. Please refer to... Figure 4 When the seal 120 is in the second state, the insertion channel 123 is closed to prevent fluid from flowing into the receiving channel 113 from the insertion channel 123. At this time, after the instrument is withdrawn from the insertion channel 123, the formed insertion channel 123 will automatically close, and the seal 120 will switch to the closed state. This closure can block the path through which fluid may leak out through the instrument insertion part, avoid large-scale fluid leakage, and improve the safety of use.

[0036] In one implementation, please refer to Figure 2 The sealing element 120 is located at the distal end of the insertion tube 110. When the instrument is inserted into or withdrawn from the insertion tube 110, the sealing element 120 at the distal end can fit against the surface of the instrument, effectively isolating the fluid in the insertion tube 110 from the distal opening. During the process of withdrawing the instrument from the insertion tube 110, this feature can prevent a large amount of fluid from flowing from the human organ or cavity into the insertion tube 110, reducing the risk of sudden pressure drop in the human organ or cavity, thereby improving the safety of the negative pressure suction sheath 100 during use.

[0037] In some embodiments, the instrument and the insertion tube 110 are fitted with a clearance. This allows the instrument to separate from the distal seal 120 as it is withdrawn, eliminating resistance between the instrument and seal 120 during the initial withdrawal process, facilitating smoother removal. Furthermore, the clearance between the instrument and the insertion tube 110 allows gas outside the insertion tube 110 to reach the distal insertion tube 110 of the instrument, preventing negative pressure from forming between the seal 120 and the distal insertion tube 110, thus reducing resistance during removal.

[0038] In another embodiment, the seal 120 is disposed within the receiving channel 113 of the insertion tube 110, which is the space where fluid flows within the insertion tube 110. By placing the seal 120 within the receiving channel 113, it creates an obstruction in the fluid flow path. This arrangement preemptively hinders fluid flow, reducing the risk of sudden pressure drops within human organs or cavities. Furthermore, the seal 120's internal placement within the receiving channel 113 prevents it from rubbing or abrading against the human body cavity during insertion of the insertion tube 110, thus ensuring the safe use of the negative pressure suction sheath 100.

[0039] In another embodiment, the seal 120 is disposed at the distal end of the insertion tube 110 and is also disposed within the receiving channel 113 of the insertion tube 110, that is, the seal 120 is disposed at the distal end of the receiving channel 113 of the insertion tube 110. This further reduces the risk of sudden pressure drop in human organs or cavities, which will not be elaborated here.

[0040] In the embodiments of this application, please refer to Figure 2The sealing element 120 can be a hollow tubular flexible membrane. The flexible membrane is light and thin, and easily deformable. The proximal end of the sealing element 120 abuts against the insertion tube 110, thus communicating with the receiving channel 113. This completely connects the internal space of the sealing element 120 with the receiving channel 113 of the insertion tube 110, allowing the instrument to smoothly enter the human body through the receiving channel 113 of the insertion tube 110. Under external pressure and / or its own elasticity, the sealing element 120 can retract towards its own central axis and seal the receiving channel 113. When external pressure acts on the sealing element 120, or when the sealing element 120 generates its own elasticity, due to the material properties of its flexible membrane, it will naturally retract towards its own central axis, thus sealing the receiving channel 113. This closing action, driven by its own material properties and external or internal forces, ensures that when the instrument is inserted into the insertion tube 110, the sealing element 120 tightly adheres to the outer surface of the instrument during the closing process. The deformation capability of the flexible membrane seals the gap between the instrument and the sealing element 120, thereby achieving a sealed fit and preventing fluid from leaking out from the gap. When the instrument is not inserted, the sealing element 120 completely closes and blocks the receiving channel 113, isolating the receiving channel 113 of the insertion tube 110 from the external environment, preventing fluid leakage or the entry of external contaminants. The sealing element 120 effectively isolates the receiving channel 113 from the human body cavity, effectively improving the safety of the negative pressure suction sheath 100.

[0041] In the embodiments of this application, please refer to Figure 5 as well as Figure 6 The seal 120 may include a distal segment 121 and a proximal segment 122. The distal segment 121 is connected to the distal end of the proximal segment 122, and the proximal segment 122 is connected to the distal end of the insertion tube 110. The film thickness of the distal segment 121 is less than that of the proximal segment 122. In one case, the thickness of the seal 120 gradually increases from the distal end to the proximal end, which makes the film thickness of the proximal segment 122 similar to that of the distal segment 121. In another case, the overall thickness of the distal segment 121 remains constant, and the overall thickness of the proximal segment 122 also remains constant. The average film thickness of the distal segment 121 is less than that of the proximal segment 122, which allows the film thickness of the seal 120 to vary in stages. This difference in film thickness makes the distal end of the seal 120 more prone to deformation and more smoothly converges in the direction of deformation, thereby forming a tighter sealing fit between the seal 120 and the instrument, ensuring a sealing effect. Furthermore, compared to the proximal end of the seal 120, the distal end of the seal 120 is more likely to converge inward. This will cause the interior of the seal 120 in the second state to form a conical space. When the instrument or dilator 200 is inserted into the seal 120, the inner wall of the seal 120 will guide the instrument or dilator 200 to move towards the central axis, preventing the instrument or dilator 200 from scraping the seal 120 and improving safety.

[0042] 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.

[0043] 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.

[0044] 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, which extends to the distal end face of the insertion tube 110. The protrusion 111 can directly abut against the surface of the instrument at the distal end face of the insertion tube 110. When the seal 120 is removed by the instrument or dilator 200, the protrusion 111 will block and separate the seal 120 from the surface of the instrument. This separates the seal 120 from the surface of the instrument or dilator 200, eliminating the tendency of the seal 120 to move with the instrument or dilator 200 to the proximal end of the insertion tube 110. This effectively prevents the seal 120 from being removed from its proper mating position by the instrument, ensuring that the seal 120 always maintains a stable sealing fit with the insertion tube 110 and the instrument, thus improving safety during use.

[0045] In one implementation, please refer 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 contacts the outer surface of the instrument, ensuring that the instrument is stably installed inside the insertion tube 110 by abutting and limiting the instrument, preventing the instrument from shaking or twisting within the insertion tube 110, thus improving safety. Furthermore, when the insertion part 310 of the endoscope 300 is located within the receiving channel 113, the protrusion 111 abuts against the insertion part 310, causing the insertion part 310 to be offset relative to the insertion tube 110, so that one side of the insertion part 310 fits against the inner wall of the insertion tube 110, while the other side forms a space to facilitate the discharge of substances.

[0046] Furthermore, the endoscope 300 may include an insertion portion 310 into which the receiving channel 113 can be inserted. The insertion tube 110 and the insertion portion 310 cooperate 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 portion 310. When the insertion portion 310 is located in the receiving channel 113, the protrusion 111 can abut against the insertion portion 310, causing the insertion portion 310 to be offset relative to the insertion tube 110. Furthermore, the protrusion 111 can abut against the insertion portion 310, reducing the movement space of the insertion portion 310 in the insertion tube 110, and relatively fixing the insertion portion 310 within the insertion tube 110, preventing the insertion portion 310 from constantly moving within and affecting the accuracy of the endoscope 300, and improving the operating feel. In addition, in some other cases, when the insertion part 310 is located in the receiving channel 113, the protrusion 111 can abut against the insertion part 310, causing the insertion part 310 to be offset relative to the insertion tube 110, so that one side of the insertion part 310 fits against the inner wall of the insertion tube 110, and the other side forms a larger space to facilitate the discharge of substances.

[0047] In the embodiments of this application, please refer to Figure 9The number of protrusions 111 is at least two, such as two, three, etc., without limitation. At least two protrusions 111 are distributed circumferentially around the insertion tube 110. Each protrusion 111 includes 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, causing one side of the insertion part 310 to conform to the inner wall of the insertion tube 110, while the other side forms a negative pressure suction channel 112, which is more conducive to the discharge of substances. Compared to the limiting fit of a single protrusion 111, the simultaneous action of the first protrusion 1111 and the second protrusion 1112 on the insertion part 310 allows for a larger and more concentrated space on one side of the insertion part 310, and this space is formed between the first protrusion 1111 and the second protrusion 1112, preventing the space from being divided by the protrusions 111.

[0048] 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 various points on the outer surface of the instrument or dilator 200. By abutting and limiting the instrument, it ensures that the instrument can be stably installed in the insertion tube 110, preventing the instrument or dilator 200 from bending and deforming, improving the insertion consistency of the negative pressure suction sheath 100, and optimizing the insertion effect.

[0049] In the embodiments of this application, please refer to Figure 10 The outer surface of the dilator 200 is provided with a first groove 210. When the dilator 200 is inserted into the insertion tube 110, the protrusion 111 can be embedded in the first groove 210. The protrusion 111 can restrict the dilator 200 from rotating 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 relative movement between the dilator 200 and the insertion tube 110, which would affect the smooth insertion of the insertion tube 110, and improve the safety of use.

[0050] For further details, please refer to Figure 11The 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. When the negative pressure suction sheath 100 is in the third state, the expander 200 and the seal 120 are in a sealing engagement, blocking the receiving channel 113. When the negative pressure suction sheath 100 is in the fourth state, the expander 200 extends into the insertion tube 110 and separates from the seal 120, which then seals the insertion tube 110. For ease of understanding and distinction, the third and fourth states are defined as two different states of the negative pressure suction sheath 100, distinct from the first and second states of the seal 120. For example, during the transition from the third to the fourth state of the negative pressure suction sheath 100, the seal 120 can seal the distal end of the insertion tube 110 under external pressure. In the initial stage after the dilator 200 is pulled out of the insertion tube 110, it can seal with the inside of the insertion tube 110. However, as the dilator 200 is pulled out, its space increases, which creates a negative pressure at the distal end of the dilator 200. This negative pressure drives the seal 120 to contract inward, thus sealing the insertion tube 110. Even if the seal 120 can switch from a first state to a second state, at this time, the dilator 200 and the insertion tube 110 form a gap through the second groove 114, connecting the proximal and distal ends of the insertion tube 110. This gap balances the negative pressure at the distal end of the insertion tube 110, preventing the negative pressure from hindering the dilator 200 from being pulled out. The dilator 200 can be pulled out quickly while preventing further interference or damage to the seal 120 by the negative pressure, thus improving operational efficiency. This design avoids a sudden drop in pressure within the body cavity and facilitates the removal of the dilator 200 while maintaining the sealing effect of the seal 120.

[0051] In one implementation, please refer to Figure 12 The first groove 210 includes a first segment 213 and a second segment 214. The first segment 213 connects to the distal end of the second segment 214. The groove width of the first segment 213 is equal to the width of the protrusion 111, and the groove width of the second segment 214 is greater than the width of the protrusion 111. When the negative pressure suction sheath 100 is in the fourth state, the protrusion 111 moves relative to the insertion tube 110 into the second segment 214, forming a gap between the protrusion 111 and the groove wall of the first groove 210, connecting the proximal and distal ends of the insertion tube 110. This ensures that when the protrusion 111 moves into the second segment 214, the gap formed between them can connect the proximal and distal ends of the insertion tube 110, further ensuring that the expander 200 is not obstructed by negative pressure when it is pulled out.

[0052] In another implementation, please refer to Figure 13The number of first grooves 210 is at least two, such as two, three, etc., without limitation. The number of first grooves 210 is greater than the number of protrusions 111, and all protrusions 111 can be embedded in the first grooves 210. When the dilator 200 is inserted into the insertion tube 110, the first grooves 210 can at least connect to the proximal end of the insertion tube 110. The fact that all protrusions 111 can be embedded in the first grooves 210, and that the first grooves 210 connect to at least the proximal end of the insertion tube 110 when the dilator 200 is inserted into the insertion tube 110, reduces friction between the dilator 200 and the insertion tube 110, allowing for smoother removal of the dilator 200.

[0053] In another embodiment, please refer to Figure 14 At least two first grooves 210 may include a first sub-groove 211 and a second sub-groove 212. The first sub-groove 211 extends through both opposite ends of the expander 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 expander 200 and is isolated from the distal end of the expander 200, so that the distal end of the expander 200 can be sealed with the insertion tube 110. The first sub-groove 211 extends through both opposite ends of the expander 200, and the protrusion 111 is embedded therein to achieve a stable fit. The second sub-groove 212 extends to the proximal end of the expander 200 and is isolated from the distal end, so that the distal end of the expander 200 can be sealed with the insertion tube 110. While ensuring a sealing effect, the second sub-groove 212 reduces the contact area between the expander 200 and the insertion tube 110, reduces friction, and facilitates the removal of the expander 200.

[0054] Please see Figure 1 as well as Figure 9 The negative pressure suction sheath 100 may further include a negative pressure conduit 130, which is connected to the insertion tube 110 and adapted to connect to a negative pressure source, such as a negative pressure pump, without limitation. The negative pressure conduit 130 provides negative pressure suction to the receiving channel 113. The negative pressure conduit 130 is located on the side of the insertion tube 110's central axis closer to the negative pressure suction channel 112 and is connected to the negative pressure suction channel 112. The negative pressure conduit 130 and the negative pressure suction channel 112 are connected and distributed along the axis. This arrangement allows fluids or substances to be discharged to be directly discharged from the negative pressure suction channel 112 along the axis, reducing the flow path and improving the efficiency of substance discharge. The substances to be discharged may be stones or other similar particles.

[0055] To achieve the above and other related objectives, this application provides a negative pressure suction assembly 1. Please refer to [link / reference]. Figure 15The negative pressure suction assembly 1 includes the aforementioned negative pressure suction sheath 100 and endoscope 300, thus enabling the negative pressure suction assembly 1 to possess the beneficial effects of any of the aforementioned solutions, which will not be elaborated further here. Furthermore, the endoscope 300 and the negative pressure suction sheath 100 are mutually compatible, and the endoscope 300 may have an insertion portion 310 that can be inserted into the negative pressure suction sheath 100.

[0056] For further details, please refer to Figure 16 The insertion part 310 has a guiding channel 320 and an instrument channel 330, which can be used to draw fluid and inject media, such as physiological saline, respectively. The instrument channel 330 passes through the opposite ends of the insertion part 310, and the guiding channel 320 has a first opening and a second opening that are connected to each other. The first opening and the second opening are spaced apart along the axial direction of the insertion part 310. When the insertion part 310 passes through the seal 120, the mating part between the seal 120 and the insertion part 310 is located between the first opening and the second opening. At this time, the seal 120 can seal against the outer wall of the insertion part 310, while the guiding channel 320 can draw in fluid and substances to be discharged, so that the insertion part 310 can normally draw in fluid and substances to be discharged, ensuring the suction function of the negative pressure suction assembly 1.

[0057] 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.

[0058] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0059] 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 negative pressure suction sheath, characterized in that, The negative pressure suction sheath includes an insertion tube and a sealing element. The insertion tube has a receiving channel inside, and the sealing element is disposed in the insertion tube. The sealing element is in a sealing fit with the insertion tube and can block the receiving channel. The insertion tube is adapted to receive an instrument that can extend from the receiving channel and pass through the seal. The seal has a first state and a second state. When the seal is in the first state, the seal forms an insertion channel and seals with the instrument located in the insertion channel. When the seal is in the second state, the insertion channel is closed to prevent fluid from flowing from the insertion channel into the receiving channel. The negative pressure suction sheath also includes an expander, which is movably disposed in the receiving channel. The inner wall surface of the insertion tube has a second groove, which extends from the proximal end of the insertion tube to the distal end. When the negative pressure suction sheath is in the first state, the expander is sealed to the sealing element and blocks the receiving channel. When the negative pressure suction sheath is in the second state, the expander and the insertion tube form a gap through the second groove that connects the proximal end and the distal end of the insertion tube.

2. The negative pressure suction sheath according to claim 1, characterized in that, The sealing element is disposed at the distal end of the insertion tube and / or within the receiving channel; And / or, the sealing element is a hollow tubular flexible membrane, the proximal end of the sealing element is connected to the insertion tube, so that the sealing element is connected to the receiving channel, and the sealing element can retract towards its own central axis and block the receiving channel under the action of external pressure and / or its own elasticity.

3. The negative pressure suction sheath according to claim 2, characterized in that, The sealing element includes a distal section and a proximal section, the distal section being connected to the distal end of the proximal section, the proximal section being connected to the distal end of the insertion tube, and the film thickness of the distal section being less than that of the proximal section. And / or, along the direction from the distal end to the proximal end of the seal, the inner diameter of the cross-section of the seal gradually decreases.

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, while the instrument is inserted into the insertion tube, the protrusion can contact the outer surface of the instrument.

5. The negative pressure suction sheath according to claim 4, characterized in that, The negative pressure suction sheath can switch 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 element are sealed to the expander and block the receiving channel. When the negative pressure suction sheath is in the fourth state, there is a gap between the expander and the insertion tube that connects the proximal and distal ends of the insertion tube. And / or, the instrument includes an endoscope, the endoscope including an insertion portion that can be inserted into the receiving channel, wherein, when the insertion portion is located in the receiving channel, the protrusion can abut against the insertion portion to offset the insertion portion relative to the insertion tube; And / or, along 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 according to claim 5, characterized in that, The outer surface of the expander is provided with a first groove, and when the expander is inserted into the insertion tube, the protrusion can be embedded in the first groove.

7. The negative pressure suction sheath according to claim 6, characterized in that, The first groove includes a first section and a second section. The first section connects to the distal end of the second section. The groove width of the first section is equal to the width of the protrusion. The groove width of the second section is greater than the width of the protrusion. When the negative pressure suction sheath is in the second state, the protrusion moves relative to the insertion tube into the second section. A gap is formed between the protrusion and the groove wall of the first groove, connecting 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 protrusions, all of which can be embedded in the first grooves, and when the expander is inserted into the insertion tube, the first grooves can at least communicate with the proximal end of the insertion tube; And / or, the number of protrusions is at least two, the at least two protrusions are distributed circumferentially along the insertion tube, the at least two protrusions include a first protrusion and a second protrusion, the first protrusion and the second protrusion can simultaneously abut against the insertion part, so that one side of the insertion part fits against the inner wall of the insertion tube, and the other side forms a negative pressure suction channel.

8. The negative pressure suction sheath according to claim 7, characterized in that, At least two of the first grooves include a first sub-groove and a second sub-groove. The first sub-groove passes through opposite ends of the expander. The protrusion is embedded in the first sub-groove. The second sub-groove extends to the proximal end of the expander and is isolated from the distal end of the expander, so that the distal end of the expander can be sealed with the insertion tube. And / or, the negative pressure suction sheath further includes a negative pressure conduit communicating with the insertion tube, the negative pressure conduit being adapted to communicate with a negative pressure source and to provide negative pressure suction force to the receiving channel, the negative pressure conduit being located on the side of the central axis of the insertion tube close to the negative pressure suction channel and communicating with the negative pressure suction channel.

9. A negative pressure suction assembly, characterized in that, The negative pressure suction assembly includes a negative pressure suction sheath and an endoscope as described in any one of claims 1-8, wherein the endoscope has an insertion portion that can be inserted into the negative pressure suction sheath.

10. The negative pressure suction assembly according to claim 9, characterized in that, The insertion part has a guiding channel and an instrument channel, the instrument channel passing through opposite ends of the insertion part, the guiding channel having a first opening and a second opening that are in communication with each other, the first opening and the second opening being spaced apart along the axial direction of the insertion part, and when the insertion part passes through the seal, the mating part between the seal and the insertion part is located between the first opening and the second opening.

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