Insertion tube and negative pressure suction sheath

Abstract

The invention discloses an insertion tube and a negative pressure suction sheath, and relates to the technical field of medical instruments.The insertion tube comprises a first tube section and a second tube section, the first tube section is arranged at the far end of the second tube section and communicates with the second tube section, the first tube section is provided with a conduction channel, the conduction channel penetrates through the side wall of the first tube section, and under the condition that an insertion part is inserted into the insertion tube, the conduction channel is communicated with the side wall of the first tube section; a gap is formed between the inner wall of the second pipe section and the insertion part, the conduction channel communicates with the gap, and the inner wall of the first pipe section can be in sealing fit with the outer wall of the insertion part. The conduction channel is independent of the position where the insertion part is located, a medium can flow in from the side wall of the first pipe section, the insertion part can stretch out through the end of the first pipe section, the medium flowing into the body cannot interfere with the suction effect of the insertion part, the blocking effect of the medium on calculus particles in the injection process is reduced, and the injection efficiency is improved. And stone particles are prevented from being pushed into the deep part of the renal pelvis by the medium in the injection process.

Description

Technical Field

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

[0002] As one of the important medical instruments 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. In addressing existing kidney stone problems, the endoscope enters the ureteral sheath to reach the upper ureter or renal pelvis for surgical procedures. During the procedure, fluid is continuously infused into the ureter through the endoscope, while the ureteral sheath aspirates fluid and stones.

[0003] During the procedure, after the stones are broken up by the laser, some stone particles may be suctioned out by the ureteral sheath. However, because the suction effect of existing ureteral sheaths is unstable, some stone particles may wander around within the kidney, failing to be suctioned out and instead depositing there. Existing ureteral sheaths cannot completely remove the stone particles, affecting the treatment outcome. Summary of the Invention

[0004] The purpose of this application is to provide an insertion tube and a negative pressure suction sheath to solve the aforementioned technical problems existing in the prior art.

[0005] In a first aspect, this application provides an insertion tube for accommodating the insertion part of an endoscope. The insertion tube includes a first tube segment and a second tube segment. The first tube segment is disposed at the distal end of the second tube segment and communicates with the second tube segment. The first tube segment has a through channel that penetrates the side wall of the first tube segment. When the insertion tube is inserted into the insertion part, a gap is formed between the inner wall of the second tube segment and the insertion part. The through channel connects the gap, and the inner wall of the first tube segment can seal against the outer wall of the insertion part.

[0006] Secondly, this application provides a negative pressure suction sheath, which includes an insertion tube and a dilator, the dilator being capable of being inserted into the insertion tube.

[0007] The technical solution adopted in this application achieves the following beneficial effects: Medical personnel can inject a medium, such as saline or other medications, through the second tubing segment. The medium passes sequentially through the gap and the guiding channel until it enters the renal pelvis. The medium balances the pressure inside the renal pelvis and promotes the expulsion of stones. At this time, the stone particles can be broken up by the laser device in the insertion section, and the stone particles and the medium are aspirated out of the body through the internal channel of the insertion section. During this period, the guiding channel is independent of the location of the insertion section, and the medium can flow in from the side wall of the first tubing segment. The insertion section can extend through the end of the first tubing segment. The medium flowing into the body does not interfere with the suction effect of the insertion section, reducing the obstruction of the medium on the stone particles during injection and preventing the medium from pushing the stone particles deeper into the renal pelvis during injection.

[0008] Furthermore, during use, both stone fragmentation and aspiration are performed through the insertion section, allowing the stones to be directly aspirated from the body after being broken up, preventing stone particles from being pushed deep into the renal pelvis. The guiding channel in the first tubing segment can be used to inject the medium. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of the insertion tube shown in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of the structure of the insertion tube and endoscope shown in an exemplary embodiment of this application; Figure 3 This is a cross-sectional view of the insertion tube and insertion portion shown in an exemplary embodiment of this application; Figure 4 yes Figure 3 Enlarged view of point a in the image; Figure 5 This is a cross-sectional view of another insertion tube and insertion portion shown in an exemplary embodiment of this application; Figure 6 This is a cross-sectional view illustrating another insertion tube and insertion portion, as shown in an exemplary embodiment of this application; Figure 7 This is a cross-sectional view of another insertion tube shown in an exemplary embodiment of this application; Figure 8 This is a schematic diagram of the structure of the insertion tube and the dilator shown in an exemplary embodiment of this application; Figure 9 This is a cross-sectional view of the insertion tube and dilator shown in an exemplary embodiment of this application; Figure 10 This is a schematic diagram of the structure of a negative pressure suction sheath, as shown in an exemplary embodiment of this application; Figure 11 This is a cross-sectional view of the expander shown in an exemplary embodiment of this application; Figure 12 This is a cross-sectional view of another expander shown in an exemplary embodiment of this application; In the diagram: 1. Negative pressure suction sheath; 100. Insertion tube; 110. First tube segment; 111. Through channel; 112. Conducting channel; 113. Sealing part; 1131. First part; 1132. Second part; 120. Second tube segment; 121. Gap; 130. Seal; 131. Insertion channel; 140. Diverter; 141. Limiting part; 142. Groove; 150. Support; 2. Endoscope; 210. Insertion part. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0012] 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.

[0013] 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".

[0014] The existing endoscope inserts its insertion section into the ureteral sheath, and this section has an instrument channel. This channel allows for the injection of a medium to balance pressure, while a laser device can be inserted into the body through the instrument channel. The laser device can break up stones. A gap exists between the ureteral sheath and the insertion section; negative pressure suction acts on this gap, drawing the stone particles out of the body.

[0015] However, during this process, the endoscopic injection medium is administered through the instrument channel, and the laser is also inserted along the instrument channel. This results in the flow direction of the infused fluid corresponding to the broken-up stones. The medium exerts a pushing force on the stones away from the endoscope and ureteral sheath, causing some stone particles to wander around within the kidney. These stones cannot be removed and instead deposit in the kidney. Existing ureteral sheaths cannot completely remove these stone particles, affecting the treatment outcome.

[0016] This application provides an insertion tube 100, please refer to... Figure 1 as well as Figure 2 The insertion tube 100 is used to accommodate the insertion portion 210 of the endoscope 2. For example, the insertion portion 210 of the endoscope 2 is a solid strip structure or a hollow tubular structure, and the insertion tube 100 can be a hollow tubular structure, and the insertion portion 210 can extend into the insertion tube 100.

[0017] Please see Figure 1 The insertion tube 100 may include a first tube segment 110 and a second tube segment 120, which are connected. The dimensions and structures of the first tube segment 110 and the second tube segment 120 may be the same or different. For example, the outer diameters of the first tube segment 110 and the second tube segment 120 may be the same, and the cross-sections of the first tube segment 110 and the second tube segment 120 may be circular. This application does not impose any limitations on this. The first tube segment 110 is located at the distal end of the second tube segment 120, and the first tube segment 110 and the second tube segment 120 are connected. Exemplarily, the insertion tube 100 may have a through channel 111 that penetrates the first tube segment 110 and the second tube segment 120. The through channel 111 enables the first tube segment 110 and the second tube segment 120 to communicate with each other, thereby allowing the insertion part 210 to extend from the second tube segment 120 to the first tube segment 110 through the through channel 111.

[0018] Please see Figure 3 as well as Figure 4The first tubing segment 110 has a connecting channel 112 that penetrates the side wall of the first tubing segment 110. The connecting channel 112 can be used for injecting or aspirating media. When the insertion tube 100 is inserted into the insertion part 210, a gap 121 is formed between the inner wall of the second tubing segment 120 and the insertion part 210. The connecting channel 112 connects to the gap 121, and the inner wall of the first tubing segment 110 can seal against the outer wall of the insertion part 210. The proximal end of the second tubing segment 120 can extend outside the body, allowing medical personnel to inject media, such as saline or other medications, through the second tubing segment 120. The media can pass sequentially through the gap 121 and the connecting channel 112 until it enters the renal pelvis. The media can balance the pressure inside the renal pelvis and promote the expulsion of stones. Please refer to [link to relevant documentation]. Figure 5 At this point, the stone particles can be broken up by the laser device of the insertion part 210, and the stone particles and the medium are drawn out of the body through the internal channel of the insertion part 210. During this period, the conduction channel 112 is independent of the location of the insertion part 210, and the medium can flow in from the side wall of the first tube segment 110. The insertion part 210 can extend through the end of the first tube segment 110. The medium flowing into the body will not interfere with the suction effect of the insertion part 210, reducing the obstruction effect of the medium on the formation of stone particles during the injection process, and preventing the medium from pushing the stone particles deep into the renal pelvis during the injection process.

[0019] Furthermore, during use, both stone fragmentation and aspiration are performed through the insertion section 210, allowing the stones to be directly aspirated from the body after being fragmented, preventing stone particles from being pushed deep into the renal pelvis. The guiding channel 112 of the first tubular segment 110 can be used to inject a medium.

[0020] Of course, in some other cases, the gap 121 can be used to aspirate media and stones, and the through channel 111 and the insertion part 210 of the first pipe section 110 can be used to inject media. It can also make the conduction channel 112 and the through channel 111 of the first pipe section 110 independent of each other, so as to avoid interference between the injection of media and the aspiration of stones. This will not be elaborated here.

[0021] In the embodiments of this application, please refer to Figure 3At least a portion of the inner wall of the first pipe section 110 protrudes inward to form a sealing portion 113. Exemplarily, the sealing portion 113 can be correspondingly disposed with the insertion portion 210, and the sealing portion 113 and the insertion portion 210 can be press-fitted together, allowing the sealing portion 113 to seal against the insertion portion 210 located within the first pipe section 110. The sealing portion 113 can be formed by protruding inward from the inner wall of the first pipe section 110, and its inner diameter is smaller than other parts of the first pipe section 110 and the second pipe section 120. The insertion portion 210 can be clearance-fitted with other parts to form a gap 121. The insertion portion 210 experiences less resistance during insertion into the insertion tube 100, facilitating the sealing fit between the insertion portion 210 and the insertion tube 100 through the sealing portion 113, thus preventing interference between the suction of stones and the injection medium and improving suction efficiency. Furthermore, the protruding sealing portion 113 can increase the strength of the first pipe section 110, so that the sealing portion 113 can maintain its original shape and stably abut against the insertion portion 210, thereby improving the sealing effect between the first pipe section 110 and the insertion portion 210.

[0022] Please see Figure 3 The guiding channel 112 is formed on the side wall of the first tube segment 110 corresponding to the plugging part 113 and extends through the proximal end of the plugging part 113. The gap 121 is formed between the second tube segment 120 and the insertion part 210. Because the plugging part 113 and the insertion part 210 cooperate with each other, the plugging part 113 can be axially aligned with the gap 121. The medium in the gap 121 can flow directly to the proximal end of the plugging part 113 and enter the guiding channel 112 until it flows into the renal pelvis. During this process, the corresponding arrangement of the plugging part 113 and the gap 121 ensures that the opening direction of the proximal end of the guiding channel 112 is similar to the extension direction of the insertion tube 100. When passing through the proximal end of the plugging part 113, the flow direction of the medium does not change significantly, avoiding a decrease in medium flow velocity due to excessively drastic changes in flow direction and improving the flow efficiency of the medium.

[0023] In some other cases, the first pipe section 110 and the second pipe section 120 have the same inner diameter, the connecting channel 112 penetrates the side wall of the first pipe section 110, and the inner wall of the second pipe section 120 has a connecting groove that can communicate with the connecting channel 112. This allows the second pipe section 120 to transport the medium to the connecting channel 112, while the insertion part 210 can be inserted into the first pipe section 110 and seal against the inner wall of the first pipe section 110, which also improves the suction efficiency. Further details are omitted here.

[0024] In the embodiments of this application, please refer to Figure 3Along the proximal to distal end of the insertion tube 100, the guiding channel 112 is inclined radially outward. The medium gradually flows along the inclined guiding channel 112 to the side wall of the insertion tube 100, and can also flow out into the body through the side wall. This arrangement allows the guiding channel 112 and the through channel 111 within the first tube segment 110 to move further apart, with the medium flowing away from the axis of the insertion tube 100. This separates the outflow direction of the medium from the suction direction of the endoscope 2 or sheath. The instrument tube of the endoscope 2 can aspirate the medium and stone particles, which further separates the guiding channel 112 and the through channel 111, preventing interference between the outflow of the medium and the suction action of the endoscope 2 or sheath, thus improving the effectiveness and suction efficiency. The distal end of the first tube segment 110 has a suction port connected to the through channel 111. The suction direction of the sheath here refers to the specific orientation of the suction port when the endoscope 2 has not extended beyond the first tube segment 110, that is, the axial direction of the suction port.

[0025] In the embodiments of this application, please refer to Figure 3 The first tube segment 110 may include a first portion 1131, the distal end of which is formed. In other words, the first portion 1131 may be at least a portion of the tube body on the distal side of the first tube segment 110. The inner diameter of the first portion 1131 gradually increases from the proximal end to the distal end of the insertion tube 100. For example, the through channel 111 within the first portion 1131 is a conical space, and the cross-sectional area of ​​the conical space gradually increases from the distal end to the proximal end of the first tube segment 110. Under the suction action of the sheath, stones and other substances in the human body are drawn into the conical space, which creates a larger inlet at the distal end of the first tube segment 110, facilitating the entry of larger stones into the first tube segment 110. The conical space can guide the stones to flow to the proximal end of the first tube segment 110, improving the suction effect of the negative pressure suction sheath 1. Of course, in some other cases, the inner diameter of the first part 1131 remains unchanged, which will not be elaborated here.

[0026] Please see Figure 2 The number of conductive channels 112 can be multiple, such as two, three, or more, and this application does not impose any limitation. Multiple conductive channels 112 are distributed at intervals around the central axis of the first pipe segment 110. This arrangement can form multiple flow structures for media circulation in the circumference of the first pipe segment 110. Compared to a single conductive channel 112, multiple channels can simultaneously transport media, increasing the total media flow per unit time, thereby improving the efficiency and uniformity of media injection and optimizing the overall injection effect. Simultaneously, while ensuring the total media flow per unit time, this avoids the conductive channels 112 being concentrated in the same location of the first pipe segment 110, which would significantly reduce the structural strength of a certain area of ​​the first pipe segment 110, thus improving operational stability.

[0027] Preferably, the outer diameter of the first tube segment 110 gradually decreases from the proximal end to the distal end of the insertion tube 100. Exemplarily, the shape of the first tube segment 110 is a hollow cone or frustum structure, etc., and is not limited thereto. This results in a smaller cross-section at the distal end of the first tube segment 110, which allows for easier insertion into narrow internal cavities during insertion, thereby improving the passageway during the insertion process and making the insertion operation smoother.

[0028] In the embodiments of this application, please refer to Figure 3 The first pipe segment 110 also includes a second part 1132, which is connected to the proximal end of the first part 1131. For example, the structure of the second part 1132 is a hollow tubular structure. The first part 1131 and the second part 1132 are two connected parts of the first pipe segment 110. The length ratio of the first part 1131 and the second part 1132 can be 1:2, 1:1, or 2:1, etc., and is not limited.

[0029] In one implementation, please refer to Figure 4 The inner diameter of the second part 1132 remains unchanged, and the second part 1132 is adapted to seal against the outer surface of the insertion part 210. The unchanged inner diameter of the second part 1132 forms a continuous and smooth contact surface, which increases the contact area between the second part 1132 and the insertion part 210, avoiding stress concentration due to an insufficient contact area and reducing the risk of damage to the second part 1132. The inner wall of the second part 1132 can stably contact the outer surface of the insertion part 210, avoiding poor local contact or incomplete fit due to changes in the inner diameter, thereby ensuring a tight seal between the two, reducing the possibility of media leakage, and significantly improving the sealing effect.

[0030] In another implementation, please refer to Figure 4 The proximal end of the second part 1132 forms a step relative to the second pipe section 120. The guiding channel 112 penetrates the step. Along the direction from the proximal to the distal end of the insertion pipe 100, the step is inclined towards the central axis of the insertion pipe 100. The inclined step provides guidance for the insertion part 210 to enter the through channel 111 of the first pipe section 110. The step guides the insertion part 210 smoothly into the through channel 111 of the first pipe section 110 along the inclined direction, avoiding deviation or jamming during insertion. Furthermore, the inclined step creates a larger inlet area for the guiding channel 112, improving the flow efficiency of the medium. The step guides the medium to converge into the through channel 112, ensuring smooth entry and delivery of the medium.

[0031] In another embodiment, the inner diameter of the second portion 1132 remains unchanged. While the second portion 1132 is adapted to seal against the outer surface of the insertion portion 210, the proximal end of the second portion 1132 forms a step relative to the second pipe section 120, which will not be described in detail here.

[0032] In the prior art, however, the applicant discovered during the implementation of this application that mucosal bleeding during surgery occurs because the upper ureter is blocked by a stone, leading to increased pressure inside the renal pelvis. Opening the upper ureter with a ureteral sheath causes a sudden drop in pressure inside the renal pelvis, resulting in bleeding of the renal pelvis mucosa due to this pressure drop, thus causing relatively serious complications. For embodiments in this application, please refer to... Figure 6 The insertion tube 100 is equipped with a sealing element 130, which is located within the communication channel 112. The sealing element 130 can be a flexible membrane or similar material. The sealing element 130 is adapted to seal against the insertion portion 210 or the dilator 140 inserted into the communication channel 112, at least isolating the opposite ends of the insertion tube 100 from each other. The sealing element 130 allows direct communication between the kidney and the outside environment during insertion of the insertion tube 100, thereby helping to maintain pressure in the insertion channel and the kidney, reducing the amplitude and range of kidney pressure changes, ensuring stable kidney pressure, effectively reducing the probability of renal mucosal bleeding due to pressure changes, and thus reducing the risk of complications.

[0033] In one embodiment, the seal 130 has a first state and a second state, see [reference needed]. Figure 6 When the seal 130 is in the first state, the seal 130 forms an insertion channel 131 and seals with the insertion portion 210 or the expander 140 located within the insertion channel 131. See also... Figure 7When the seal 130 is in the second state, the insertion channel 131 is closed to prevent fluid from flowing to the proximal end of the conduction channel 112. For example, the seal 130 can fit tightly against the device surface, and the inner wall of the seal 130 will fit tightly against the device surface located within the insertion channel 131 to seal the gap between the seal 130 and the device, preventing fluid from flowing out of the gap and causing a sudden drop in kidney pressure. This allows the device to smoothly pass through the insertion channel 131 and enter the predetermined position, while also preventing the rapid outflow of fluid from the body cavity during device penetration, thus preventing a sudden drop in pressure. The device includes, but is not limited to, the insertion part 210 or the dilator 140. When the seal 130 is in the second state, the insertion channel 131 is closed to prevent fluid from flowing into the receiving channel from the insertion channel 131. After the device is removed from the insertion channel 131, the insertion channel 131 will automatically close as the seal 130 retracts inward. For example, the seal 130 can be a flexible membrane, which is lightweight and thin, and easily deformable. Due to the material properties of its flexible membrane, the seal 130 will retract towards its own central axis, thereby sealing the insertion channel 131. At this time, the seal 130 switches to the closed state, which can block the path that fluid may leak out through the device insertion part, avoid large-scale fluid leakage, and improve safety.

[0034] It should be noted that, for example, please refer to [link / reference]. Figure 7 The sealing element 130 can be disposed within the through-channel 111 of the second tube segment 120. The sealing element 130 will retract towards its own central axis to seal the insertion channel 131. When the insertion part 210 is inserted into the insertion tube 100, the sealing element 130 can fit tightly against the instrument surface, and the inner wall of the sealing element 130 will fit tightly against the instrument surface located in the insertion channel 131 to seal the gap between the sealing element 130 and the insertion part 210, preventing fluid from flowing out of the gap and causing a sudden drop in kidney pressure. At this time, when fluid is injected into the gap 121, the sealing element 130 can expand outward under the drive of the fluid to open the gap 121, allowing the fluid to flow through the gap 121 into the guiding channel 112. The medium can pass through the gap 121 and the guiding channel 112 in sequence until it enters the renal pelvis. During the insertion of the insertion tube 100 into the insertion section 210 and the injection of the medium into the insertion tube 100, the two ends of the insertion tube 100 can be isolated from each other to prevent excessive loss of fluid in the kidneys and a sudden drop in pressure.

[0035] In the embodiments of this application, please refer to Figure 3When the insertion part 210 is withdrawn or inserted into the first tube segment 110, the sealing part 113 can generate damped friction with the distal region of the outer periphery of the insertion part 210. For example, the insertion part 210 and the sealing part 113 are interference-fitted, and when the insertion part 210 is inserted into the sealing part 113, damped friction can be generated between the insertion part 210 and the sealing part 113. Medical personnel insert the insertion part 210 of the endoscope 2 into the first tube segment 110 and then withdraw it from the distal end to the proximal end of the insertion tube 100. When medical staff pull out the endoscope 2 to the predetermined position of the insertion tube 100, they will clearly feel an increase in the resistance to pull out. This change in resistance can serve as operational feedback, helping medical staff to judge the position of the insertion part 210, thereby enabling the endoscope 2 to remain stably in the predetermined position of the insertion tube 100. This avoids the insertion part 210 from shifting due to the lack of resistance constraint, improves the operability of the insertion part 210 and the insertion tube 100, and enhances the effectiveness of the negative pressure suction sheath 1.

[0036] In another implementation, please refer to Figure 8 as well as Figure 9 The distal end of the sealing portion 113 can abut against the expander 140 axially to achieve a sealing fit between the expander 140 and the sealing portion 113. For example, the expander 140 has a limiting portion 141, the outer diameter of which is larger than the inner diameter of the sealing portion 113, and the limiting portion 141 can abut against the sealing portion 113. Further, along the proximal to distal end of the insertion tube 100, the inner diameter of the first portion 1131 of the first tube segment 110 gradually increases, meaning at least a portion of the sealing portion 113 is located within the first portion 1131, and the distal end face of the sealing portion 113 is inclined. For example, in some cases, the inner diameter of the portion of the sealing portion 113 in the first portion 1131 gradually increases along the direction from the proximal to the distal end of the insertion tube 100, while the inner diameter of the portion of the sealing portion 113 in the second portion 1132 remains unchanged and cooperates with the insertion portion 210 for limiting; however, this is not overly restricted. Correspondingly, a corresponding bevel can also be configured on the proximal end of the limiting part 141 to ensure stable contact between the two. Axial contact allows for stable contact between the dilator 140 and the sealing part 113, which constrains the relative position of the dilator 140 and the sealing part 113. The sealing part 113 provides positional support for the insertion part 210 of the endoscope 2, reducing displacement of the endoscope 2 during use, helping it to better remain in the predetermined position, improving the operability of the insertion part 210 and the insertion tube 100, and enhancing the effectiveness of the negative pressure suction sheath 1. At the same time, the sealing fit between the dilator 140 and the sealing part 113 effectively blocks the fluid flow path, preventing a large amount of fluid from flowing out from the gap 121 between the dilator 140 and the first tube segment 110, thereby preventing excessive fluid loss from the kidney and a sudden drop in pressure.

[0037] To achieve the above and other related objectives, this application provides a negative pressure suction sheath 1. Please refer to [link to relevant documentation]. Figure 10 The negative pressure suction sheath may include the insertion tube 100 and the dilator 140 of the above embodiments, and the dilator 140 can be inserted into the insertion tube 100. In this way, the negative pressure suction sheath 1 has the beneficial effects of any of the aforementioned solutions, which will not be described in detail here.

[0038] In a more specific implementation, please refer to Figure 11 The distal end of the dilator 140 is inclined, and along the proximal to distal end of the dilator 140, the distal end is inclined toward the direction close to the central axis of the dilator 140. For example, the distal end of the dilator 140 forms a conical or frustum-shaped structure, and the distal end of the dilator 140 is thinner, extending out of the insertion tube 100 and being inserted into the human body along with the insertion tube 100. When inserted into the body, the dilator 140 can more easily enter narrow internal cavities, thereby improving the passage during insertion and making the insertion operation smoother.

[0039] In another implementation, please refer to [the original text]. Figure 9 The dilator 140 may include a limiting portion 141, the outer diameter of which is larger than the inner diameter of the blocking portion 113. In other words, the limiting portion 141 may be formed by protruding from the outer surface of the dilator 140. The limiting portion 141 can extend to the distal end of the insertion tube 100, and the limiting portion 141 axially abuts against the blocking portion 113 of the insertion tube 100. The axial abutment can form a stable contact between the dilator 140 and the blocking portion 113, which can constrain the relative position of the dilator 140 and the blocking portion 113. The blocking portion 113 provides positional support for the insertion portion 210 of the endoscope 2, reduces the displacement of the endoscope 2 during use, helps it to stay in the predetermined position better, improves the operability of the insertion portion 210 and the insertion tube 100, and improves the effectiveness of the negative pressure suction sheath 1. At the same time, the sealing fit between the dilator 140 and the plug 113 can effectively block the fluid flow path, preventing a large amount of fluid from flowing out from the gap 121 between the dilator 140 and the first tube section 110, thereby preventing excessive fluid loss in the kidney and causing a sudden drop in pressure.

[0040] In the embodiments of this application, please refer to Figure 11The dilator 140 can be a hollow structure with elasticity. For example, the dilator 140 can be a hollow silicone rubber component or a nitrile rubber component, etc., and is not limited thereto. During the removal of the dilator 140, when the dilator 140 contacts the sealing portion 113, its elastic properties allow the dilator 140 to undergo adaptive deformation under force, gradually reducing the outer diameter of the dilator 140 so that the dilator 140 can smoothly pass through the sealing portion 113. After passing through, the dilator 140 can return to its original shape. The dilator 140 can maintain its original shape during subsequent removal, reducing the gap 121 between the dilator 140 and the second tube segment 120, preventing the gap 121 from being too large and instantly connecting the opposite ends of the insertion tube 100, thus mitigating the pressure changes within the kidney.

[0041] Please see Figure 9 and Figure 11 The surface of the dilator 140 is provided with a groove 142, which extends axially along the dilator 140 and to the distal end of the dilator 140. For example, the groove 142 can extend from the proximal end to the distal end of the dilator 140. Alternatively, the groove 142 can be formed in a first region of the dilator 140, communicating with the first tube segment 110 when the dilator 140 is inserted into the first tube segment 110. When the dilator 140 is inserted into the first tube segment 110, the groove 142 communicates with the second tube segment 120. During the removal of the dilator 140, the groove 142 can connect the distal end of the dilator 140 and the gap 121, allowing fluid in the gap 121 to flow along the axial groove 142 and enter the kidney through the communicating channel 112. This prevents excessively rapid loss of renal fluid due to the inability to drain fluid from the gap 121 after the dilator 140 is removed, thereby effectively preventing or mitigating a sudden drop in renal pressure.

[0042] In a more specific implementation, please refer to Figure 11 and Figure 12 The negative pressure suction sheath 1 may also be provided with a support member 150. The support member 150 may be a rod-shaped structure. The support member 150 is movably disposed within the expander 140 to switch between a restricted position and an unlocked position. In other words, the hollow support member 150 has an expansion channel that extends to the proximal end of the support member 150. The support member 150 can be inserted into the expansion channel and support the inner wall of the expander 140.

[0043] Please see Figure 12When the support member 150 is in the restricted position, it supports the inner wall of the expander 140 and is radially aligned with the limiting part 141 of the expander 140, thereby limiting and stopping the limiting part 141 and the sealing part 113. When the support member 150 is in the unlocked position, it is radially misaligned with the limiting part 141 of the expander 140, allowing the limiting part 141 to deform and pass through the sealing part 113. For example, during the insertion of the insertion tube 100 into the human body, the support member 150 supports the inner wall of the expander 140, causing the expander 140 and the first tube segment 110 to axially abut against each other. At this time, the expander 140 and the first tube segment 110 can jointly bear the axial force during insertion, avoiding deformation or displacement caused by the force on a single component, ensuring that both are pushed forward synchronously and stably, and smoothly inserted into the designated area inside the human body. Subsequently, during the withdrawal of the expander 140, the support member 150 is driven to the unlocked position. The support member 150 and the limiting part 141 are radially misaligned in the dilator 140. After deformation, the limiting part 141 can smoothly pass through the blocking part 113. At the same time, the dilator 140 can collapse after losing the inner wall support of the support member 150, reducing its radial size, thereby easily passing through narrow areas inside the body and making the removal operation smoother. This design can improve the insertion effect of the dilator 140 and the insertion tube 100, and reduce the resistance of the insertion tube 100 during removal, reducing traction damage to surrounding tissues caused by the movement of the insertion tube 100, and improving operational safety and patient comfort.

[0044] 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.

[0045] 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.

[0046] The above description is merely a specific embodiment of this application, but the scope of protection of this application 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 this application should be included within the scope of protection of this application.

Claims

1. An insertion tube for receiving the insertion portion of an endoscope, characterized in that, The insertion tube includes a first tube segment and a second tube segment, wherein: The first pipe segment is located at the distal end of the second pipe segment and is connected to the second pipe segment. The first pipe segment has a conductive channel that penetrates the side wall of the first pipe segment. When the insertion tube is inserted into the insertion part, a gap is formed between the inner wall of the second tube segment and the insertion part, the conductive channel communicates with the gap, and the inner wall of the first tube segment can seal against the outer wall of the insertion part.

2. The insertion tube according to claim 1, characterized in that, At least a portion of the inner wall of the first pipe section protrudes inward to form a sealing portion, which can seal with the insertion portion located in the first pipe section. The conduction channel is opened on the side wall of the first pipe section corresponding to the sealing portion and extends through the proximal end of the sealing portion.

3. The insertion tube according to claim 2, characterized in that, Along the direction from the proximal end to the distal end of the insertion tube, the guiding channel is inclined in a radially outward direction; And / or, the first tube segment includes a first portion, the distal end face of the first tube segment being formed in the first portion, and the inner diameter of the first portion gradually increases from the proximal end to the distal end of the insertion tube; And / or, the number of the conductive channels is multiple, and the multiple conductive channels are distributed at intervals around the central axis of the first pipe segment; And / or, along the proximal end to the distal end of the insertion tube, the outer diameter of the first tube segment gradually decreases.

4. The insertion tube according to claim 3, characterized in that, The first pipe segment further includes a second portion, the second portion being connected to the proximal end of the first portion, wherein: The inner diameter of the second part remains unchanged, and the second part is adapted to seal against the outer surface of the insertion part; And / or, the proximal end of the second portion forms a step relative to the second tube segment, the guiding channel extends through the step, and the step is inclined toward the direction close to the central axis of the insert tube in the direction from the proximal end to the distal end of the insert tube.

5. The insertion tube according to claim 3, characterized in that, When the insertion part is pulled out or inserted into the first tube segment, the sealing part can generate damping friction with the distal region of the outer periphery of the insertion part; And / or, the distal end of the plugging portion can abut against the expander axially to achieve a sealing fit between the expander and the plugging portion.

6. The insertion tube according to claim 1, characterized in that, The insertion tube is provided with a sealing element located within the conductive channel. The sealing element is adapted to seal against the insertion portion or expander inserted into the conductive channel, so as to at least isolate the opposite ends of the insertion tube from each other.

7. The insertion tube according to claim 6, characterized in that, 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 insertion part or the expander located in the insertion channel. When the seal is in the second state, the insertion channel is closed to prevent fluid from flowing to the proximal end of the conduction channel. And / or, when fluid is injected into the gap, the seal can be deployed outward under the drive of the fluid to open the gap, allowing the fluid to flow through the gap into the conduction channel.

8. A negative pressure suction sheath, characterized in that, The negative pressure suction sheath includes an insertion tube and a dilator as described in any one of claims 1-7, wherein the dilator is capable of being inserted into the insertion tube.

9. The negative pressure suction sheath according to claim 8, characterized in that, The distal end face of the expander is inclined, and along the proximal end to the distal end of the expander, the distal end face of the expander is inclined toward the direction close to the central axis of the expander. And / or, the expander includes a limiting part, the outer diameter of which is larger than the inner diameter of the plugging part of the first tube segment, the limiting part being able to extend to the distal end of the insertion tube and axially abutting against the plugging part of the insertion tube; And / or, the expander is a hollow structure with elasticity; And / or, the surface of the expander is provided with a groove that extends axially along the expander and to the distal end of the expander, and the groove communicates with the second pipe segment when the expander is inserted into the first pipe segment.

10. The negative pressure suction sheath according to claim 9, characterized in that, The negative pressure suction sheath is also provided with a support member, which is movably disposed within the expander to switch between a restricted position and an unlocked position. When the support member is in the restricted position, the support member supports the inner wall of the expander and is arranged radially corresponding to the limiting part of the expander, so that the limiting part and the sealing part are limited and stopped. When the support member is in the unlocked position, the support member and the limiting part are misaligned radially in the expander, allowing the limiting part to deform and pass through the blocking part.

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