Negative‑pressure suction sheath

Abstract

The present application relates to the technical field of medical devices, and in particular to a negative‑pressure suction sheath. The negative-pressure suction sheath comprises a sheath tube and a directional expansion structure; the sheath tube is arranged at the distal end of the negative‑pressure suction sheath; the distal end of the sheath tube comprises a passive bending section capable of bending along with an active bending section of an endoscope; the side wall of the passive bending section is provided with a through opening; the through opening extends in the extension direction of the passive bending section; the directional expansion structure is connected to the sheath tube and seals the through opening; when the passive bending section bends and compresses the portion of the directional expansion structure sealing the through opening, the compressed portion of the directional expansion structure bulges toward the outside of the through opening. The present application can solve the problem that, when an insertion portion is used to drive the distal end of the sheath tube to bend so as to suction stones at a lateral side, unsmooth stone removal easily occurs.

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 directional expansion 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, which extends along the extension direction of the passive bending section. The directional expansion structure is connected to the sheath tube and seals the through-hole.

[0007] When the passive bending section bends and compresses the portion of the directional expansion structure that seals the through-hole, the compressed portion of the directional expansion structure bulges outward toward the outside of the through-hole.

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

[0009] The passive bending section has a through-hole on its side wall. The directional expansion structure is connected to the sheath and seals the through-hole, thus preventing the aspirated material between the active bending section and the sheath from leaking out of the sheath through the through-hole. When using the negative pressure suction sheath of this application, the insertion part of the endoscope can be inserted into the sheath. When the active bending section drives the passive bending section to bend, the passive bending section will squeeze the part of the directional expansion structure that blocks the through-hole, causing the two ends of this part of the directional expansion structure to move closer to each other. This causes this part of the directional expansion structure to bulge outward from the through-hole, which increases the cross-sectional area of ​​the passive bending section at its own through-hole, thereby increasing the flow area at that point and increasing the minimum value of each maximum distance. This allows the target material to pass smoothly through the gap between the bent active bending section and the bent passive bending section, thus solving the problem of unsmooth aspiration of stones.

[0010] When the passive bending segment does not bend along with the active bending segment, the portion of the directional expansion structure located at the penetration opening will not be compressed. Therefore, the directional expansion structure will not bulge outward from the penetration opening. In other words, when the passive bending segment is in a straight state, the outer diameter of each part of the passive bending segment 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 a schematic diagram of the cooperation between the negative pressure suction sheath and the insertion part disclosed in the first embodiment of this application;

[0012] Figure 2 is an exploded view of the negative pressure suction sheath and the insertion part after they are engaged, as disclosed in the first embodiment of this application;

[0013] Figure 3 is a cross-sectional view of the negative pressure suction sheath and the insertion part after being engaged, as disclosed in the first embodiment of this application;

[0014] Figure 4 is a schematic diagram of the cooperation between the negative pressure suction sheath and the insertion part disclosed in the second embodiment of this application;

[0015] Figure 5 is an exploded view of the negative pressure suction sheath and the insertion part after they are engaged, as disclosed in the second embodiment of this application.

[0016] Figure 6 is an exploded view of the negative pressure suction sheath disclosed in the third embodiment of this application;

[0017] Figure 7 is an exploded view of the negative pressure suction sheath disclosed in the second embodiment of this application;

[0018] Figure 8 is an exploded view of the negative pressure suction sheath disclosed in the fourth embodiment of this application;

[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; 110, passive bending section; 111, penetration port; 200, directional expansion structure; 210, sealing membrane; 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] 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 active bending section 310 and the sheath 100. This gap surrounds the active bending section 310. Therefore, the distances between the various regions of a portion of the active bending section 310 in its extension direction and the inner wall of the sheath 100 are not equal. The maximum value of the distances between this portion of the active bending section 310 and the sheath 100 in the various regions of the circumferential direction is the maximum distance between this portion of the active bending section 310 and the sheath 100.

[0027] As shown in Figures 1 to 8, a negative pressure suction sheath includes a sheath tube 100 and a directional expansion 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 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 used.

[0028] The passive bending section 110 has a through-hole 111 on its side wall, which extends from the outer circumferential surface of the passive bending section 110 to its inner circumferential surface. The through-hole 111 extends along the extension direction of the passive bending section 110. The directional expansion structure 200 is connected to the sheath 100 and seals the through-hole 111. Specifically, the directional expansion 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] When the passive bending section 110 bends and compresses the portion of the directional expansion structure 200 that seals the through-hole 111, the compressed portion of the directional expansion structure 200 bulges outward toward the through-hole 111. Specifically, referring to Figure 1, when the passive bending section 110 bends following the active bending section 310, the portion of the through-hole 111 located on the compression side of the passive bending section 110 adapts to the bending of the passive bending section 110. Therefore, the distance between the two ends of the through-hole 111 along the extension direction of the passive bending section 110 decreases. This causes the portion of the directional expansion structure 200 covering the through-hole 111 to be compressed. When the directional expansion structure 200 is subjected to compressive force, it deforms and expands outward. Here, "outward" refers to the portion of the directional expansion structure 200 covering the through-hole 111 that is away from the outside of the through-hole 111.

[0030] The passive bending section 110 has a through-hole 111 on its side wall. The directional expansion structure 200 is connected to the sheath 100 and seals the through-hole 111, thus preventing the aspirated material between the active bending section 310 and the sheath 100 from leaking out of the sheath 100 through the through-hole 111. When using the negative pressure suction sheath of this application, the insertion part 300 of the endoscope can be inserted into the sheath 100. When the active bending section 310 drives the passive bending section 110 to bend, the passive bending section 110 will squeeze the portion of the directional expansion structure 200 that blocks the through-hole 111. This causes the two ends of this portion of the directional expansion structure 200 to move closer to each other, thereby causing this portion of the directional expansion structure 200 to bulge outward toward the through-hole 111. This increases the cross-sectional area of ​​the passive bending section 110 at its own through-hole 111, thereby increasing the flow area at that location and increasing the minimum value among the maximum distances. This allows the target object (the stone stuck in the relevant technology) to 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 not being discharged smoothly while waiting for suction.

[0031] Furthermore, when the passive bending section 110 of this application does not bend along with the active bending section 310, the portion of the directional expansion structure 200 located at the through-hole 111 will not be squeezed. Therefore, the directional expansion 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.

[0032] The operation methods using the negative pressure suction sheath of this application include the following two:

[0033] 1. After the endoscope insertion section 300 is inserted into the sheath 100 and the active bending section 310 causes the sheath 100 to bend, the raised directional expansion structure 200 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.

[0034] 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 directional expansion structure 200 does not correspond to the minimum value of each maximum distance of the sheath 100 in the prior art. For example, the raised directional expansion structure 200 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 directional expansion structure 200. In order to use the raised directional expansion structure 200 to make the minimum value of each maximum distance greater than the size of the target object, the target object stuck between the bent sheath 100 and the bent active bending section 310 is introduced into the raised directional expansion structure 200 to solve the problem of the target object being stuck between the bent sheath 100 and the bent active bending section 310.

[0035] To prevent the directional expansion structure 200 from collapsing inward toward the passive bending section 110 when compressed, and to prevent the directional expansion structure 200 from collapsing inward and not bulging outward toward the opening 111, thus the stone awaiting aspiration may still not be able to pass smoothly through the gap between the bent active bending section 310 and the bent passive bending section 110, in an optional embodiment, the directional expansion structure 200 includes a sealing membrane 210 and a braided layer (not shown in the figure). The sealing membrane 210 is connected to the braided layer. When the passive bending section 110 bends and compresses the portion of the directional expansion structure 200 that seals the opening 111, the compressed portion of the braided layer bulges outward toward the opening 111.

[0036] The directional expansion structure 200 includes a sealing membrane 210 and a braided layer, which gives the directional expansion structure 200 a certain degree of rigidity and toughness. Thus, when subjected to compressive force, the directional expansion structure 200 is less likely to collapse inwards towards the passively bent section 110, but more likely to bulge outwards towards the through-hole 111, thereby facilitating the resolution of problems such as difficulty in expelling stones while waiting for aspiration. Of course, the directional expansion structure 200 may also include only the sealing membrane 210; this application does not limit this.

[0037] In one optional embodiment, the braided layer includes a first portion and a second portion. The first portion covers the middle part of the through-hole 111 along the extension direction of the passively bent section 110, and the second portion covers the other part of the through-hole 111. The stiffness of the first portion is greater than that of the second portion. Specifically, the second portion may include a first sub-part and a second sub-part, which are located on both sides of the first portion and connected to the first portion respectively. The stiffness of both the first sub-part and the second sub-part is less than that of the first portion.

[0038] Because the second part has lower stiffness and the first part has higher stiffness, this difference in stiffness causes uneven stress distribution in the contact area between the braided layer and the passively bent section 110 when the braided layer bends. This results in stress concentration in the middle of the braided layer and relative dispersion on both sides. This uneven stress distribution pushes the center of the braided layer outwards when it bends, making it easier for the braided layer to bulge. Of course, the stiffness of the first part can also be less than or equal to the stiffness of the second part; this application does not impose any limitation on this.

[0039] In one optional embodiment, the weave density of the first part is greater than that of the second part. By setting different weave densities, the stiffness of the first part can be greater than that of the second part, which is more conducive to processing the woven layer. Of course, the stiffness of the first part can also be greater than that of the second part by setting different weave diameters or different weave materials.

[0040] Referring to Figure 8, in an optional embodiment, when the passively bent section 110 is in a straightened state, the portion of the directional expansion 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 directional expansion structure 200, the pre-bulged portion of the directional expansion structure 200 bulges toward the outside of the through-hole 111.

[0041] The directional expansion structure 200 is initially pre-bulging outwards, meaning that the directional expansion structure 200 already has a certain tendency to expand outwards even when it is not subjected to external force. This gives the outer side of the directional expansion structure 200 a higher initial curvature. Thus, when the directional expansion structure 200 is subjected to compressive force, this pre-bulging structure can better adapt to the bending deformation of the passive bending section 110, making it easier for the directional expansion structure 200 to expand outwards.

[0042] Referring to Figure 2, in an optional embodiment, along the extension direction of the passively bent section 110, the depth of the through opening 111 gradually increases and then gradually decreases, and the part with the greatest depth of the through opening 111 is located in the middle of the through opening 111 along the extension direction of the passively bent section 110.

[0043] The penetration 111 has a greater depth in the middle of the passive bending section 110 along its extension direction, and a smaller depth on both sides. This results in less solid material remaining in the middle portion of the passive bending section 110 opposite to the penetration 111, while more solid material remains in the opposite portions on both sides. In other words, the cross-sectional area and stiffness of the middle portion of the passive bending section 110 opposite to the penetration 111 are smaller. Thus, when the passive bending section 110 is subjected to the bending moment applied by the active bending section 310, the middle portion of the passive bending section 110 opposite to the penetration 111 is more prone to deformation, and the degree of deformation is greater. This allows the two ends of the opposite portions of the passive bending section 110 and the penetration 111 to be closer together, thereby increasing the squeezing force on the directional expansion structure 200, increasing the bulging degree of the directional expansion structure 200, and further improving the smoothness of expelling stones and awaiting aspiration.

[0044] And / or, in an optional embodiment, the directional expansion structure 200 is annular and is fitted outside the passive bending section 110. The annular shape of the directional expansion structure increases the connection area between the directional expansion structure and the passive bending section, thereby improving the connection stability between them. Of course, the directional expansion structure 200 may not be annular; it may be sheet-like, and this application does not limit this to that.

[0045] Please continue to refer to Figure 2. In one optional embodiment, the number of through openings 111 is one, and the maximum depth of the through opening 111 is greater than half of the outer diameter of the passively bent section 110.

[0046] The maximum depth of the through-hole 111 is greater than half the outer diameter of the passive bending section 110. This results in less remaining solid material and lower stiffness in the portion of the passive bending section 110 opposite to the middle of the through-hole 111. Thus, when the passive bending section 110 is subjected to the bending moment applied by the active bending section 310, the degree of deformation of the portion of the passive bending section 110 opposite to the middle of the through-hole 111 will be further increased. This can further reduce the distance between the two ends of the portion of the passive bending section 110 opposite to the two sides of the through-hole 111, thereby increasing the squeezing force on the directional expansion structure 200, further increasing the bulging degree of the directional expansion structure 200, and further improving the smoothness of expelling stones and waiting for suction.

[0047] Please refer to Figures 5 and 7. In one optional embodiment, there are two through-holes 111, which are located on opposite sides of the passively bent section 110, and the directional expansion structure 200 seals each through-hole 111.

[0048] 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 stretching side of the passive bending section, the directional expansion structure will not bulge outward from the through-hole. However, in order 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. The directional expansion structure seals each through-hole. Thus, regardless of which direction the active bending section bends in, there is always one through-hole located on the compression side of the passive bending section, causing the portion of the directional expansion structure that blocks the corresponding through-hole to expand and bulge in the direction away from that through-hole. It can be seen that with the structure of this embodiment, regardless of which direction the active bending section bends in, the directional expansion structure can expand and bulge in that direction. When the negative pressure suction sheath is used to aspirate stones, the stones will not get stuck between the active and passive bending sections.

[0049] Please continue to refer to Figure 5. In one optional embodiment, along the extension direction of the passively bent section 110, the depth of each through-hole 111 gradually increases and then gradually decreases, and the part with the largest depth of each through-hole 111 is located in the middle of the corresponding through-hole 111 along the extension direction of the passively bent section 110.

[0050] The depth of the middle part of each through-hole 111 along the extension direction of the passive bending section 110 is larger, while the depth of the two sides is smaller. This allows less solid material to remain in the part of the passive bending section 110 opposite to the middle of the through-hole 111. In other words, the cross-sectional area and stiffness of the part of the passive bending section 110 opposite to the middle of the through-hole 111 are smaller. Thus, when the passive bending section 110 is subjected to the bending moment applied by the active bending section 310, the part of the passive bending section 110 opposite to the middle of the through-hole 111 is more likely to deform and the degree of deformation is greater. This allows the two ends of the part of the passive bending section 110 opposite to the two sides of the through-hole 111 to be closer together, thereby increasing the compressive force on the directional expansion structure 200, increasing the degree of bulging of the directional expansion structure 200, and further improving the smoothness of the discharge of the suction material.

[0051] In a further embodiment, the maximum depth of each through-hole 111 is less than half the outer diameter of the passive bending section 110, and the sum of the maximum depths of the two through-holes 111 is greater than half the outer diameter of the passive bending section 110. This results in less remaining solid material and lower stiffness in the portion of the passive bending section 110 opposite to the middle of the through-hole 111. Thus, when the passive bending section 110 is subjected to the bending moment applied by the active bending section 310, the degree of deformation of the portion of the passive bending section 110 opposite to the middle of the through-hole 111 will be further increased. This can further reduce the distance between the two ends of the portion of the passive bending section 110 opposite to the two sides of the through-hole 111, thereby further increasing the compressive force on the directional expansion structure 200, further increasing the bulge of the directional expansion structure 200, and further improving the smoothness of the discharge of the suction material.

[0052] Referring to Figure 6, in one optional embodiment, the number of through-holes 111 includes at least three, which are evenly spaced along the circumference of the passively bent section 110. The directional expansion structure 200 seals each through-hole 111. In this embodiment, the at least three through-holes 111 are evenly spaced along the circumference of the passively bent section 110. Thus, even if the actively bent section 310 has more than two bending directions, with the structure of this embodiment, the directional expansion structure 200 can expand and bulge regardless of which direction the actively bent section 310 bends. When the stone is suctioned by the negative pressure suction sheath, the stone will not get stuck between the actively bent section 310 and the passively bent section 110.

Claims

1. A negative pressure suction sheath, characterized in that, The device includes a sheath (100) and a directional expansion 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 sidewall 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 directional expansion structure (200) is connected to the sheath (100) and seals the through-hole (111). When the passive bending section (110) bends and squeezes the portion of the directional expansion structure (200) that seals the through opening (111), the squeezed portion of the directional expansion structure (200) bulges outward toward the outside of the through opening (111).

2. The negative pressure suction sheath according to claim 1, characterized in that, The directional expansion structure (200) includes a sealing membrane (210) and a braided layer. The sealing membrane (210) is connected to the braided layer. When the passive bending section (110) bends and squeezes the portion of the directional expansion structure (200) that seals the passage (111), the squeezed portion of the braided layer bulges outward toward the outside of the passage (111).

3. The negative pressure suction sheath according to claim 2, characterized in that, The braided layer includes a first part and a second part, the first part covering the middle of the through opening (111) along the extension direction of the passively bent section (110), and the second part covering the other part of the through opening (111), the first part having a greater stiffness than the second part.

4. The negative pressure suction sheath according to claim 3, characterized in that, The weaving density of the first part is greater than that of the second part.

5. The negative pressure suction sheath according to claim 1, characterized in that, When the passively bent section (110) is in a straightened state, the portion of the directional expansion structure (200) that seals the through-hole (111) is pre-bulged toward the outside of the through-hole (111); When the passive bending section (110) bends and compresses the pre-bulged portion of the directional expansion structure (200), the pre-bulged portion of the directional expansion structure (200) bulges outward toward the through opening (111).

6. The negative pressure suction sheath according to claim 1, characterized in that, Along the extension direction of the passive bending section (110), the depth of the through opening (111) gradually increases and then gradually decreases, and the part with the largest depth of the through opening (111) is located in the middle of the through opening (111) along the extension direction of the passive bending section (110). And / or, the directional expansion structure (200) is a ring structure, and the directional expansion structure (200) is sleeved outside the passive bending section (110).

7. The negative pressure suction sheath according to claim 6, characterized in that, The number of the through openings (111) is one, and the maximum depth of the through opening (111) is greater than half the outer diameter of the passive bending section (110).

8. The negative pressure suction sheath according to claim 1, characterized in that, There are two through-holes (111), and the two through-holes (111) are located on opposite sides of the passive bending section (110), and the directional expansion structure (200) seals each of the through-holes (111).

9. The negative pressure suction sheath according to claim 8, characterized in that, Along the extension direction of the passive bending section (110), the depth of each through-hole (111) gradually increases and then gradually decreases, and the part with the largest depth of each through-hole (111) is located in the middle of the corresponding through-hole (111) along the extension direction of the passive bending section (110). The maximum depth of each of the through openings (111) is less than half the outer diameter of the passive bending section (110), and the sum of the maximum depths of the two through openings (111) is greater than half the outer diameter of the passive bending section (110).

10. The negative pressure suction sheath according to claim 1, characterized in that, The number of the through openings (111) includes at least three, and the at least three through openings (111) are evenly spaced along the circumference of the passive bending section (110), and the directional expansion structure (200) seals each of the through openings (111).

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