Negative-pressure suction sheath

Abstract

A negative-pressure suction sheath, comprising a sheath tube (100) and a blocking structure (200), wherein the sheath tube (100) is arranged at a distal end of the negative-pressure suction sheath; a distal end of the sheath tube (100) is provided with a passive bending section (110) that can bend following an active bending section (310) of an endoscope; a side wall of the passive bending section (110) is provided with a through opening (111) that extends in the extension direction of the passive bending section (110), the maximum depth of the through opening (111) being less than half the outer diameter of the passive bending section (110); the blocking structure (200) is connected to the sheath tube (100) and seals the through opening (111); and the passive bending section (110) comprises an expandable portion (112) arranged radially opposite the through opening (111), and when the passive bending section (110) is bent and the side of the expandable portion (112) facing away from the through opening (111) is a tension side, the expandable portion (112) expands outward in a direction perpendicular to the plane in which the bending direction of the passive bending section (110) is located. The negative-pressure suction sheath solves the problem of unsmooth stone removal when an insertion portion is used to bend the distal end of the sheath tube to suction stones laterally.

Description

Negative pressure suction sheath Technical Field

[0001] This application belongs to the field of medical device technology, specifically relating to a negative pressure suction sheath. Background Technology

[0002] Negative pressure suction sheaths are commonly used in urological endoscopic examinations or surgeries. They can create a surgical channel within the urinary system to assist endoscopes and surgical instruments in passing through cavities such as the urethra and ureters, thereby improving the effectiveness and safety of examinations and treatments.

[0003] When using a negative pressure suction sheath to remove kidney stones, a guidewire is used to insert the sheath into the kidney, and then the insertion part of the endoscope is inserted into the sheath to observe and break up the stone. When the stone is located to the side of the sheath, the insertion part can be used to bend the distal end of the sheath, bringing the sheath towards the stone and aspirating it into the gap between the insertion part and the sheath, thus expelling the stone. However, in practice, when using the insertion part to bend the distal end of the sheath to aspirate stones from the side, problems with stone expulsion are common. Summary of the Invention

[0004] The purpose of this application is to provide a negative pressure suction sheath that can solve the problem of poor stone expulsion when using the insertion part to bend the distal end of the sheath tube to suction stones from the side.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application provides a negative pressure suction sheath, including a sheath tube and a sealing structure. The sheath tube is located at the distal end of the negative pressure suction sheath. The distal end of the sheath tube has a passive bending section that can follow the bending of the active bending section of the endoscope. The side wall of the passive bending section is provided with a through-hole. The through-hole extends along the extension direction of the passive bending section. The maximum depth of the through-hole is less than half of the outer diameter of the passive bending section. The sealing structure is connected to the sheath tube and seals the through-hole.

[0007] The passive bending section includes an expandable portion disposed radially opposite to the through opening. When the passive bending section bends and the expandable portion is on the stretching side away from the through opening, the expandable portion expands outward in a direction perpendicular to the bending direction of the passive bending section.

[0008] The beneficial technical effects of this application are as follows:

[0009] In this application, a through-hole is provided on the passively bent section. This through-hole disrupts the continuity of the passively bent section, causing stress concentration near the through-hole during bending. The area of ​​stress concentration is more prone to deformation due to excessive local stress. This causes the expandable portion, radially opposite the through-hole, to expand outwards along a plane perpendicular to the bending direction of the passively bent section, releasing the stress accumulated during bending. The outward radial expansion of the expandable portion increases the distance between its inner wall and the active bent section, thereby increasing the flow area and the minimum of the maximum distances. This allows the target material to pass smoothly through the gap between the bent active and passive sections, thus solving the problem of difficulty in expelling stones and awaiting suction.

[0010] When the passive bending section of this application does not bend along with the active bending section, the portion of the sealing structure located at the penetration opening will not be squeezed. Therefore, the sealing structure will not bulge outward from the penetration opening. In other words, when the passive bending section is in a straight state, the outer diameter of each part of the passive bending section in its own extension direction is small, which is beneficial for inserting the sheath into the human body. Attached Figure Description

[0011] Figure 1 is an exploded schematic diagram of a portion of the structure of the guidance sheath disclosed in the first embodiment of this application;

[0012] Figure 2 is an exploded schematic diagram of a portion of the structure of the guide sheath when the passive bending segment disclosed in the first embodiment of this application is bent.

[0013] Figure 3 is an exploded schematic diagram of a portion of the guiding sheath structure disclosed in the second embodiment of this application;

[0014] Figure 4 is an enlarged schematic diagram of point A in Figure 3 of this application;

[0015] Figure 5 is an exploded schematic diagram of a portion of the structure of the guide sheath when the passive bending segment disclosed in the second embodiment of this application is bent.

[0016] Figure 6 is an exploded schematic diagram of a portion of the guiding sheath structure disclosed in the third embodiment of this application;

[0017] Figure 7 is an exploded schematic diagram of a portion of the structure of the guide sheath when the passive bending segment disclosed in the third embodiment of this application is bent.

[0018] Figure 8 is a schematic diagram of the cooperation between the guide sheath and the insertion part when the passive bending section disclosed in the third embodiment of this application is bent.

[0019] Figure 9 is a schematic diagram of the fit between the curved sheath and the curved active bending section in the related technology, and a schematic diagram of the cross section along line a to line g.

[0020] Explanation of reference numerals in the attached figures:

[0021] 100, Sheath; 101, First section; 102, Second section; 110, Passive bending section; 111, Through-hole; 1111, Arc-shaped part; 1112, Connecting part; 112, Expandable part; 113, Support tongue; 200, Sealing structure; 300, Insertion part; 310, Active bending section. Detailed Implementation

[0022] The terms “first”, “second”, etc., used in this application are used to distinguish similar objects, and not to describe a specific order or sequence.

[0023] In this application, "proximal end" and "distal end" refer to the end closer to the user and the end farther from the user, relative to the user's position in the usage environment of the negative pressure suction sheath and its components.

[0024] As shown in Figure 9, during the surgical procedure in which the insertion part 300 and the sheath 100 are used together to remove stones and await aspiration, there is an aspiration gap between the endoscopic insertion part 300 and the inner wall of the sheath 100, allowing the stones to be expelled through this aspiration gap.

[0025] The inventors discovered that during actual surgery, when the active bending segment 310 causes the sheath 100 to be in a bent state, different parts of the active bending segment 310 will abut against specific positions of the sheath 100. Therefore, in the extension direction of the active bending segment 310, the maximum distance between each part of the bent active bending segment 310 and the inner wall of the bent sheath 100 is not uniformly distributed. In other words, the maximum distance between each part of the bent active bending segment 310 and the inner wall of the bent sheath 100 in its extension direction is constantly changing. Therefore, during the stone aspiration process, stones with a size equal to or slightly larger than the minimum value of each maximum distance may block the bent sheath 100 and the bent active bending segment 310, resulting in unsmooth stone removal.

[0026] Here, the maximum distance between each part of the curved active bending section 310 in its own extension direction and the inner wall of the curved sheath 100 is explained. Please refer to views a to g in Figure 9. Since the diameter of the active bending section 310 is smaller than the diameter of the sheath 100, there must be a gap between the curved active bending section 310 and the curved sheath 100. This gap surrounds the curved active bending section 310. Therefore, the distances between each region of a part of the curved active bending section 310 in its own extension direction and the inner wall of the sheath 100 are not equal. The maximum value of the distances between this part of the curved active bending section 310 and the sheath 100 in the circumferential direction is the maximum distance between this part of the curved active bending section 310 and the curved sheath 100.

[0027] As shown in Figures 1 to 8, this application discloses a negative pressure suction sheath, including a sheath tube 100 and a sealing structure 200. The sheath tube 100 is located at the distal end of the negative pressure suction sheath, and the distal end of the sheath tube 100 has a passive bending section 110 that can bend following the active bending section 310 of the endoscope. Exemplarily, the endoscope here can be a bronchoscope, pyeloscope, esophagoscope, gastroscope, colonoscope, otoscope, rhinoscope, oral endoscope, laryngoscope, colposcope, laparoscope, arthroscope, etc. This application does not specifically limit the type of endoscope.

[0028] The passive bending section 110 has a through-hole 111 on its side wall. This through-hole 111 extends from the outer circumferential surface of the passive bending section 110 to its inner circumferential surface, extending along the extension direction of the passive bending section 110. The maximum depth of the through-hole 111 is less than half the outer diameter of the passive bending section 110. The sealing structure 200 is connected to the sheath 100 and seals the through-hole 111. Specifically, the sealing structure 200 covers and seals the through-hole 111, thereby preventing the material to be aspirated between the active bending section 310 and the sheath 100 from leaking out of the sheath 100 through the through-hole 111.

[0029] The passively bent section 110 includes an expandable portion 112 radially opposite to the through opening 111. Taking the view shown in FIG1 as an example, the expandable portion 112 is formed by opening the through opening 111 in the passively bent section 110. The expandable portion 112 is located below the through opening 111. When the passively bent section 110 is bent and the side of the expandable portion 112 away from the through opening 111 is the stretching side, the expandable portion 112 expands outward in a direction perpendicular to the bending direction of the passively bent section 110. Specifically, the bending direction of the passively bent section 110 is the direction shown by the y-arrow in FIG2, and the direction perpendicular to the plane where the y-arrow is located is the direction shown by the x-arrow. That is to say, the expandable portion 112 expands radially outward in the direction shown by the x-arrow in FIG2.

[0030] It should be noted that when the passive bending section 110 is bent, one side of the passive bending section 110 is the tensile side and the other side is the compressive side. Taking the view shown in Figure 2 as an example, the lower side of the passive bending section 110 is the tensile side.

[0031] A through-hole 111 is provided on the passively bent section 110. The through-hole 111 disrupts the continuity of the passively bent section 110, causing stress concentration near the through-hole 111 when the passively bent section 110 bends. The area of ​​stress concentration is more prone to deformation due to excessive local stress. As a result, the expandable portion 112, which is radially opposite to the through-hole 111, expands outward in a plane perpendicular to the bending direction of the passively bent section 110, thereby releasing the stress accumulated during the bending of the passively bent section 110. After the expandable portion 112 expands radially outward, the distance between the inner wall of the expandable portion 112 and the actively bent section 310 is increased, thereby increasing the flow area at that point and increasing the minimum of the maximum distances. This allows the target object (the stone stuck in the relevant technology) to pass smoothly through the gap between the bent actively bent section 310 and the bent passively bent section 110, thus solving the problem of the stone being difficult to expel while waiting for suction.

[0032] After the expandable section 112 expands radially, the flow path of the target object is as follows: Taking the orientation shown in view a in Figure 9 as an example, the target object first passes over the active bending section 310. When the target object flows to the narrow area (view c in Figure 9), the target object flows circumferentially to the side of the active bending section 310, thereby entering the expanded expandable section 112. Then the target object flows circumferentially again to the bottom of the active bending section 310 (view e in Figure 9) to pass through the narrow area.

[0033] When the passive bending section 110 of this application does not bend along with the active bending section 310, the portion of the sealing structure 200 located at the through-hole 111 will not be squeezed. Therefore, the sealing structure 200 will not bulge outward from the through-hole 111. In other words, when the passive bending section 110 is in a straight state, the outer diameter of each part of the passive bending section 110 in its own extension direction is small, which is beneficial for inserting the sheath 100 into the human body.

[0034] The negative pressure suction sheath operation method of this application includes the following two methods:

[0035] 1. After the insertion part 300 of the endoscope is inserted into the sheath 100 and the active bending section 310 causes the sheath 100 to bend, the expandable part 112 corresponds to the minimum value of each maximum distance of the sheath 100 in the prior art. That is to say, after the active bending section 310 is inserted into the sheath 100 and causes the sheath 100 to bend, the minimum value of each maximum distance is greater than the size of the target object. In this way, the target object can pass smoothly through the gap between the bent active bending section 310 and the inner wall of the section of the sheath 100 bent by the active bending section 310, thereby solving the problem of unsmooth discharge of the aspirated material.

[0036] 2. After inserting the endoscope insertion section 300 into the sheath 100 and the active bending section 310 causes the sheath 100 to bend, the raised expandable section 112 does not correspond to the minimum value of each maximum distance of the sheath 100 in the prior art. For example, the expandable section 112 is located near the minimum value of each maximum distance of the sheath 100. At this time, it is only necessary to pull the active bending section 310 to move the active bending section 310 to the proximal end until a part of the bent active bending section 310 enters the raised expandable section 112. The raised expandable section 112 is used to make the minimum value of each maximum distance greater than the size of the target object, thereby introducing the target object stuck between the bent sheath 100 and the bent active bending section 310 into the raised expandable section 112, so as to solve the problem of the target object being stuck between the bent sheath 100 and the bent active bending section 310.

[0037] Please refer to Figures 3 to 5. In one alternative embodiment, the depth of the middle portion of the through opening 111 along the extension direction of the passively bent section 110 is less than the depth of the other portions of the through opening 111.

[0038] The expandable portion 112 is naturally formed after the through-hole 111 is opened. Therefore, the height of the expandable portion 112 is related to the depth of the through-hole 111, and the sum of the two is equal to the outer diameter of the through-hole 111. A shallower depth in the middle of the through-hole 111 allows for a greater height in the middle of the expandable portion 112. The greater the height of the middle of the expandable portion 112, the greater its radial expansion along the direction indicated by the x-arrow. Therefore, this structure further increases the distance between the inner wall of the expandable portion 112 and the active bending section 310, allowing larger stones and other materials awaiting aspiration to pass through the gap between the expandable portion 112 and the active bending section 310, thus improving the passage of the sheath 100. Furthermore, because the depth of the through-hole 111 along its extension direction is greater, the height of the sides of the expandable portion 112 is also smaller. This obviously results in relatively lower structural strength for the expandable portion 112, making it easier for it to deform.

[0039] Referring to Figure 4, in an optional embodiment, the bottom wall of the through-hole 111 includes an arcuate portion 1111, which is located at the middle of the through-hole 111 along the extension direction of the passively bent section 110.

[0040] The arc-shaped portion 1111 protrudes away from the expandable portion 112. The bottom wall of the through-port 111 forms the arc-shaped portion 1111, which is located in the middle of the through-port 111. The arc-shaped portion 1111 is characterized by being high in the middle and low on both sides, meaning that the depth in the middle of the through-port 111 is small, while the depth on both sides is large. This can further increase the height of the middle part of the expandable portion 112, thereby further improving the passage of the sheath 100. At the same time, the greater depth on both sides of the middle part of the through-port 111 makes the height on both sides of the expandable portion 112 smaller, thus making it easier for the expandable portion 112 to deform.

[0041] Please refer to Figure 4. In one optional embodiment, the bottom wall of the through-hole 111 further includes two connecting portions 1112. The two connecting portions 1112 are located on both sides of the arc-shaped portion 1111 and are connected to the arc-shaped portion 1111. Each connecting portion 1112 is a plane. The connecting portions 1112 are planes. Compared with a curved surface, the height of the plane is consistent, which allows the two sides of the through-hole 111 to have a larger depth. Moreover, this depth does not decrease in the extension direction of the through-hole 111, thus making it more conducive to the bending of the passive bending section 110.

[0042] Referring to Figures 1 and 2, in some alternative embodiments, the depth of the through opening 111 may also remain unchanged along the extension direction of the passively bent segment 110.

[0043] To prevent the sealing structure 200 from deforming inward during the bending of the passive bending section 110, please refer to Figures 6 to 8. In an optional embodiment, the inner wall of the through-hole 111 has the outline of a support tongue 113 formed on the side wall of the passive bending section 110, the support tongue 113 being located at one end of the through-hole 111.

[0044] While forming the through-hole 111 on the passive bending section 110, a supporting tongue 113 is also formed. When the passive bending section 110 bends, the two sides of the through-hole 111 will move closer to each other. Therefore, the supporting tongue 113 will also move closer to the other end of the through-hole 111. In this way, the supporting tongue 113 can provide support for a part of the blocking structure 200, preventing the blocking structure 200 from collapsing into the interior of the passive bending section 110, thereby increasing the distance between the blocking structure 200 and the active bending section 310, and preventing the stone waiting to be aspirated from getting stuck between the active bending section 310 and the blocking structure 200.

[0045] Referring to Figure 6, in an optional embodiment, the direction in which the end of the support tongue 113 connected to the other part of the passive bending section 110 extends to the other end is a first direction (indicated by the m-arrow in Figure 6). This first direction is parallel to the extension direction of the passive bending section 110, thereby improving the support performance of the support tongue 113 on the sealing structure 200 and further enhancing the passage of the sheath 100. Of course, the first direction can also be parallel to the direction indicated by the x-arrow in Figure 2.

[0046] Please continue referring to Figure 6. In one optional embodiment, a first cut surface 101 and a second cut surface 102 are formed on the sidewall of the passively bent section 110. The first cut surface 101 and the second cut surface 102 intersect each other. The inner wall of the through opening 111 includes the first cut surface 101 and the second cut surface 102. The first cut surface 101 and the second cut surface 102 are both inclined relative to the axial direction of the passively bent section 110. The included angle between the first cut surface 101 and the second cut surface 102 is an acute angle, and the inclination directions of the first cut surface 101 and the second cut surface 102 are opposite. The plane on which the inner wall of the supporting tongue 113 is located coincides with the second cut surface 102.

[0047] The first cut surface 101 and the second cut surface 102 have opposite inclination directions, and the included angle between them is an acute angle. That is to say, the groove depth of the through opening 111 is the largest at the intersection of the first cut surface 101 and the second cut surface 102. Therefore, when the passive bending section 110 bends, the passive bending section 110 will bend at this point. That is to say, the bending point of the passive bending section 110 is adjacent to the support tongue 113, and the degree of collapse of the part of the sealing structure 200 located at the bending point is the largest. Therefore, the support tongue 113 can support the part of the sealing structure 200 with the largest degree of collapse, so as to further improve the passage of the sheath 100.

[0048] In one optional embodiment, the number of through openings 111 includes two, with the two through openings 111 respectively located on opposite sides of the passively bent section 110, and the two through openings 111 being spaced apart along the extension direction of the passively bent section 110.

[0049] Generally, the active bending section of an endoscope has a bidirectional bending function. If only one through-hole is provided, and the passive bending section follows the active bending section, if the through-hole is located on the compression side of the passive bending section, the expandable part will not expand radially outward. However, to enable the negative pressure suction sheath of this application to adapt to the bidirectional bending of the active bending section, this embodiment provides through-holes on both opposite sides of the passive bending section, and a sealing structure seals each through-hole. Thus, regardless of which direction the active bending section bends, there is always one through-hole located on the stretching side of the passive bending section, allowing the corresponding expandable part to expand radially outward. Therefore, with this structure, regardless of the direction the active bending section bends, the expandable part expands radially outward. When using the negative pressure suction sheath to aspirate stones, the stones will not become stuck between the active and passive bending sections.

[0050] In an alternative embodiment, when the passive bending section 110 bends and compresses the portion of the sealing structure 200 that seals the passage 111, the compressed portion of the sealing structure 200 bulges outward toward the outside of the passage 111.

[0051] When using the negative pressure suction sheath of this application, the insertion part 300 of the endoscope can be inserted into the sheath tube 100. When the active bending section 310 drives the passive bending section 110 to bend, the passive bending section 110 will squeeze the part of the blocking structure 200 that blocks the through-hole 111, so that the two ends of this part of the blocking structure 200 are close to each other, thereby making this part of the blocking structure 200 bulge outward of the through-hole 111. This can increase the cross-sectional area of ​​the passive bending section 110 at its own through-hole 111, thereby increasing the flow area at this point and increasing the minimum value among the maximum distances. In this way, the target object can pass smoothly through the gap between the bent active bending section 310 and the bent passive bending section 110, thereby solving the problem of the stone being difficult to expel while waiting for suction.

[0052] It should be noted that the compressed part of the sealing structure 200 bulges outward radially in the direction away from the through opening 111 (the direction shown by the z arrow in Figure 2).

[0053] In one alternative embodiment, the sealing structure 200 includes a sealing membrane and a braided layer (not shown). The sealing membrane is connected to the braided layer. When the passive bending section 110 bends and compresses a portion of the sealing structure 200 that seals the passage 111, the compressed portion of the braided layer bulges outward toward the outside of the passage 111. Further, the sealing structure 200 is an annular structure.

[0054] In one alternative embodiment, when the passively bent section 110 is in a straightened state, the portion of the sealing structure 200 that seals the through-hole 111 is pre-bulged toward the outside of the through-hole 111. When the passively bent section 110 bends and compresses the pre-bulged portion of the sealing structure 200, the pre-bulged portion of the sealing structure 200 bulges toward the outside of the through-hole 111.

[0055] In this embodiment, the sealing structure 200 is initially pre-bulging outwards. That is, the sealing structure 200 already has a certain tendency to expand outwards when it is not subjected to external force. This makes the outer side of the sealing structure 200 have a higher initial curvature. Thus, when the sealing structure 200 is subjected to compressive force, this pre-bulging structure can better adapt to the bending deformation of the passive bending section 110, thereby making it easier for the sealing structure 200 to expand and bulge outwards.

Claims

1. A negative pressure suction sheath, characterized in that, The device includes a sheath (100) and a sealing structure (200). The sheath (100) is located at the distal end of the negative pressure suction sheath. The distal end of the sheath (100) has a passive bending section (110) that can bend with the active bending section (310) of the endoscope. The side wall of the passive bending section (110) is provided with a through-hole (111). The through-hole (111) extends along the extension direction of the passive bending section (110). The maximum depth of the through-hole (111) is less than half of the outer diameter of the passive bending section (110). The sealing structure (200) is connected to the sheath (100) and seals the through-hole (111). The passive bending section (110) includes an expandable portion (112) disposed radially opposite to the through opening (111). When the passive bending section (110) bends and the side of the expandable portion (112) away from the through opening (111) is the stretching side, the expandable portion (112) expands outward along a plane perpendicular to the bending direction of the passive bending section (110).

2. The negative pressure suction sheath according to claim 1, characterized in that, The depth of the middle portion of the through opening (111) along the extension direction of the passively curved section (110) is less than the depth of the other portions of the through opening (111).

3. The negative pressure suction sheath according to claim 2, characterized in that, The bottom wall of the through opening (111) includes an arc-shaped portion (1111) located at the middle of the through opening (111) along the extension direction of the passively bent section (110).

4. The negative pressure suction sheath according to claim 3, characterized in that, The bottom wall of the through opening (111) also includes two connecting parts (1112), which are located on both sides of the arc-shaped part (1111) and are connected to the arc-shaped part (1111). Each connecting part (1112) is a plane.

5. The negative pressure suction sheath according to claim 1, characterized in that, The inner wall of the through opening (111) has the outline of a support tongue (113) formed on the side wall of the passively bent section (110), the support tongue (113) being located at one end of the through opening (111).

6. The negative pressure suction sheath according to claim 5, characterized in that, The direction in which the supporting tongue (113) extends from one end to the other end of the passively bent segment (110) is a first direction, which is parallel to the extension direction of the passively bent segment (110).

7. The negative pressure suction sheath according to claim 6, characterized in that, The passive bending section (110) has a first cut surface (101) and a second cut surface (102) formed on its sidewall. The first cut surface (101) and the second cut surface (102) intersect each other. The inner wall of the through opening (111) includes the first cut surface (101) and the second cut surface (102). The first cut surface (101) and the second cut surface (102) are both inclined relative to the axial direction of the passive bending section (110). The angle between the first cut surface (101) and the second cut surface (102) is an acute angle, and the inclination directions of the first cut surface (101) and the second cut surface (102) are opposite. The plane of the inner wall of the support tongue (113) coincides with the second cut surface (102).

8. The negative pressure suction sheath according to claim 1, characterized in that, The number of the through openings (111) includes two, and the two through openings (111) are respectively located on opposite sides of the passive bending section (110), and the two through openings (111) are spaced apart along the extension direction of the passive bending section (110).

9. The negative pressure suction sheath according to claim 1, characterized in that, When the passive bending section (110) bends and squeezes the portion of the sealing structure (200) that seals the passage (111), the squeezed portion of the sealing structure (200) bulges outward toward the outside of the passage (111).

10. The negative pressure suction sheath according to claim 9, characterized in that, When the passively bent section (110) is in a straightened state, the portion of the sealing structure (200) that seals the through opening (111) is pre-bulged outward from the through opening (111); When the passive bending section (110) bends and compresses the pre-bulging portion of the sealing structure (200), the pre-bulging portion of the sealing structure (200) bulges outward toward the through opening (111).

Images