Ligation device and ligature ring for a ligation device
By improving the structure and operating components of the ligation ring, the problems of easy breakage and misoperation of the ligation ring were solved, achieving high strength and reliability of the ligation ring and improving the success rate of the operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU FRANKENMAN MEDICAL EQUIP
- Filing Date
- 2025-09-12
- Publication Date
- 2026-08-04
AI Technical Summary
The ligation rings of existing ligation devices are prone to bending, deformation, and breakage, making operation difficult. They are also prone to getting stuck or falling off due to misoperation, which affects the hemostasis effect.
The ligation ring and operating components are designed in separate parts. The ligation ring is made of shape memory material and includes a first and a third part with a rectangular cross-section. It combines a sleeve and a spring tube structure and achieves multi-state switching through an operating handle and a traction component, reducing frictional resistance and the risk of breakage.
The strength of the ligation ring is improved, preventing jamming and misoperation, ensuring the reliability and stability of the ligation ring, and improving the success rate of the surgery.
Smart Images
Figure CN224584805U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, specifically to a ligation device and a ligation ring for the ligation device. Background Technology
[0002] The ligation device is a medical instrument specifically designed for digestive endoscopy, primarily used for hemostasis after polypectomy and for ligation of esophageal and gastric varices. Its core function is to achieve hemostasis or treatment by physically blocking blood vessels, offering advantages such as high efficiency and minimal invasiveness.
[0003] Currently, most ligation devices on the market use ligation rings made from extruded raw materials, formed by hot-melting the ends. During tightening, these rings are prone to bending, deformation, and breakage. Furthermore, structural issues with the components used to push and pull the ligation ring lead to problems such as the ring getting stuck and unable to tighten or release, or the ring falling off, thus affecting the ligation effect. Additionally, due to the high difficulty of ligation and removal under endoscopy, in emergency or temporary use of ligation devices, human error can easily cause the ligation ring to tighten prematurely or fall off, preventing effective ligation.
[0004] Currently, conventional ligation devices require a one-time operation for ligation and cannot be loosened and adjusted a second time. In order to reduce the difficulty of ligation operation and improve the success rate of ligation, it is necessary to improve the existing ligation devices to overcome the problems mentioned above in clinical use. Summary of the Invention
[0005] The purpose of this invention is to provide a ligation device with high ligation ring strength, which will not get stuck during use and avoids misoperation.
[0006] Another objective of this invention is to provide a ligation ring for the ligation device that is strong, not easily broken, and does not jam the catheter assembly during use.
[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A ligation device includes a ligation loop and an operating component that are separately configured.
[0008] The ligation ring includes a ligation ring body and a sleeve movably fitted onto the ligation ring body. The ligation ring body is made of a material with shape memory function and includes an integrally formed first part, a second part, and a third part from its proximal end to its distal end. The first part has an open structure, the second part has a linear structure, and the third part has a closed ring structure. The cross-sections of the second part perpendicular to its axis, the cross-sections of the wire forming the first part perpendicular to its axis, and the cross-sections of the wire forming the third part perpendicular to its axis are all rectangular. The rectangular cross-section of the second part provides higher strength and reduces the contact area with the inside of the spring tube, thereby reducing the frictional resistance generated when the ligation ring body moves within the spring tube and further reducing the risk of ligation ring breakage. The rectangular cross-sections of the wires forming the first and third parts both improve the overall strength of the ligation ring body.
[0009] The operating assembly includes a catheter assembly, a traction component, and an operating handle. The catheter assembly includes an outer sheath and a spring tube passing through the outer sheath. The traction component is movably inserted through the spring tube in a proximal-distal direction, and its distal end has a hook. The operating handle includes a fixed seat at the proximal end of the catheter assembly, an operating element slidably disposed on the fixed seat and fixedly connected to the traction component, and a blocking component detachably connected to the fixed seat to limit the sliding of the operating element. The hook can engage with the opening structure, and the distal end of the spring tube can engage with the proximal end of the cannula. The traction component can drive the ligation ring body to move along the spring tube.
[0010] The ligation device has a first working state (when the ligation ring is fully expanded and not released), a second working state (when the ligation ring is tightened but not released) and a third working state (when the ligation ring is tightened and released).
[0011] When it is in the first working state, the first part is located in the spring tube and the opening structure is connected to the hook, the sleeve is located on the second part and is connected to the spring tube, and the third part is in a fully open state; When it is in the second working state, the first part, the second part and part of the third part are located in the spring tube and the opening structure is connected to the hook. The sleeve is located on the third part and is connected to the spring tube. The third part is in a tightened state. When in its third working state, the distal end of the traction component extends beyond the distal end of the spring tube, the ligation ring separates from the operating component, and the sleeve is located on the third part, dividing the third part into two closed ring structures.
[0012] The operating handle is located at the proximal end of the catheter assembly and the traction component. The movement of the traction component is driven by the sliding of the operating element on the operating handle, which in turn drives the ligation ring to move, thereby realizing the transition from the first working state to the second working state and from the second working state to the third working state.
[0013] In some embodiments, the first portion has a naturally expanded state and a compressed state, wherein it is in the compressed state when it is located in the spring tube, the maximum outer diameter of the first portion in the naturally expanded state is greater than the proximal inner diameter of the sleeve to prevent the sleeve from falling off the ligation ring body, and the maximum outer diameter of the first portion in the compressed state is equal to the inner diameter of the spring tube, wherein the opening structure is more open in the naturally expanded state than in the compressed state.
[0014] In some embodiments, the first part has a ring-shaped or rhomboid structure in its naturally expanded state, which facilitates its conversion between the naturally expanded state and the compressed state under the action of external force. This not only makes it easy for the hook to catch the ligation ring during assembly, but also makes it easy for it to quickly return to the naturally expanded state after being released from the spring tube during use, thereby enabling it to quickly detach from the hook at the distal end of the traction component and realize the rapid release of the ligation ring.
[0015] In some embodiments, the ligation ring is axially symmetrical, with the axis of symmetry extending along the proximal and distal directions. Because the ligation ring is integrally formed, it can ensure high symmetry on both sides, can shrink synchronously, is not easily bent or deformed, and ensures the ligation effect.
[0016] In some embodiments, the sleeve has an axial length approximately equal to the length of the second portion.
[0017] In some embodiments, the distal end of the third portion has a V-shaped guide extending outward from the closed annular structure, which facilitates the movement of the ligation ring within the body, thereby allowing for faster adjustment of the ligation ring's position.
[0018] In some embodiments, the proximal end of the sleeve is provided with an annular protrusion that extends from the proximal surface of the sleeve in a direction away from the sleeve. The inner diameter of the annular protrusion is equal to the inner diameter of the sleeve, and the outer diameter of the annular protrusion is less than or equal to the inner diameter of the spring tube. The outer diameter of the sleeve is greater than or equal to the outer diameter of the spring tube.
[0019] Before the traction component releases the ligation ring, the annular protrusion is always inserted into the spring tube, and the proximal end of the sleeve is always in contact with the distal end of the spring tube. This facilitates the ligation ring to quickly enter the spring tube and tighten under the action of the traction component. At the same time, the sleeve is always in contact with the distal end of the spring tube. The concentricity and coaxiality of the spring tube and sleeve provide good support and avoid the dilemma of being stuck in the spring tube due to the sleeve getting stuck in the spring tube.
[0020] In some embodiments, the conduit assembly further includes an inner tube fitted onto the traction component and fixedly connected to the operating handle. A connecting component is fixedly connected to the distal end of the traction component, and the connecting component is always located outside the distal end of the inner tube. The hook is fixedly connected to the distal end of the connecting component. The inner tube restricts the movement of the traction component, preventing direct contact between the traction component and the spring tube, allowing the traction component to move more effectively within the spring tube. The connecting component enhances the connection strength between the hook and the traction component and also restricts the movement of the hook radially, preventing the hook from scraping against the inner wall of the spring tube or getting stuck in the spring tube, thus improving the smoothness of the hook's movement within the spring tube.
[0021] In some embodiments, the traction component is made of stainless steel wire. Of course, in other embodiments, other materials can be selected for the traction component according to actual needs, preferably having a certain strength.
[0022] In some embodiments, the blocking member includes a first blocking member located on the outer sides of both ends of the operating member, limiting its sliding in a proximal direction, and a second blocking member limiting its sliding in a distal direction. The first blocking member can be used to prevent accidental lifting and tightening, and the second blocking member can be used to prevent accidental premature release.
[0023] In some embodiments, the fixed base is provided with a limiting groove extending in the proximal direction, the operating member is connected to the limiting groove, and the blocking member is detachably installed on the limiting groove.
[0024] In some embodiments, the sleeve is made of silicone. The hard silicone described in this invention refers to silicone with a Shore hardness of 60-90°A, preferably 70-80°A.
[0025] In some embodiments, the ligation ring body is made of polyamide. Of course, in other embodiments, other materials can be selected according to the actual required strength or toughness.
[0026] In some embodiments, the outer sheath is made of a polymer material. Of course, in other embodiments, other materials can be selected based on the required strength or other factors.
[0027] In some specific embodiments, the spring tube is made of metal.
[0028] The outer sheath is slidably fitted onto the spring tube in the proximal and distal directions, and the ligation ring can be retracted into the outer sheath.
[0029] The second aspect of this utility model provides a ligation ring for a ligation device, wherein the ligation ring is the ligation ring described in the aforementioned ligation device. The ligation ring body of this utility model is integrally molded, making it less prone to breakage, allowing for simultaneous tightening, and preventing bending or deformation. The sleeve's structural design ensures concentricity and coaxiality with the spring tube, providing excellent support and preventing it from easily getting stuck in the spring tube.
[0030] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: The ligation device of this invention, through the combination of a specially structured ligation ring and an optimized operating component structure design, makes the ligation ring less prone to breakage and jamming during use compared to existing ligation devices. It also avoids premature tightening or premature release of the ligation ring due to misoperation, thereby improving the success rate of the surgery and achieving better ligation results. Attached Figure Description
[0031] Figure 1 This is a three-dimensional structural diagram of the ligation device of Embodiment 1 in its first working state. Figure 2 for Figure 1 A schematic diagram of a partial sectional view of the distal end of the ligation device shown. Figure 3 This is a front view schematic diagram of the ligation device of Embodiment 1 in its first working state; Figure 4 This is a schematic diagram of the front cross-sectional structure of the ligation device of Embodiment 1 when it is in the first working state; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a front view schematic diagram of the ligation device of Embodiment 1 in its second working state; Figure 7 This is a schematic diagram of the front cross-sectional structure of the ligation device of Embodiment 1 when it is in the second working state; Figure 8 for Figure 7 Enlarged view of point B in the middle; Figure 9 for Figure 7 Enlarged view of point C in the middle; Figure 10 This is a three-dimensional structural diagram of the ligation device in Example 1 when it is in the third working state. Figure 11 for Figure 10 A schematic diagram of the main structure of the operating components shown in the figure; Figure 12 for Figure 10 A schematic diagram of the front cross-sectional structure of the operating component shown; Figure 13 for Figure 12 Enlarged view at point D in the middle. Wherein: 1. Ligation ring; 111. First part; 112. Second part; 113. Third part; 12. Sleeve; 121. Annular protrusion; 2. Operating component; 211. Outer sheath; 212. Spring tube; 213. Inner tube; 22. Traction component; 221. Hook; 222. Connecting component; 231. Fixing seat; 2311. Limiting groove; 232. Operating component; 2331. First blocking component; 2332. Second blocking component. Detailed Implementation
[0032] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.
[0033] In the description of the embodiments of this utility model, it should be understood that "distal end" refers to the end of the instrument or component that is far away from the operator, and "proximal end" refers to the end of the instrument or component that is close to the operator; "inner" and "outer" are positions defined by distance relative to the center of the instrument or component, where "inner" is the position close to the center of the instrument or component, and "outer" is the position far away from the center of the instrument or component.
[0034] In the description of the embodiments of this utility model, it should be understood that "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.
[0035] The foregoing disclosure provides many different implementations or examples for carrying out different structures of the present invention. To simplify the disclosure of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.
[0036] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.
[0037] Example 1: This example provides a ligation device, such as... Figures 1 to 13 As shown, it includes a ligation ring 1 and an operating assembly 2, which are separately configured. The ligation ring 1 includes a ligation ring body and a sleeve 12 slidably fitted onto the ligation ring body. The ligation ring body includes, from its proximal end to its distal end, an integrally formed first part 111, a second part 112, and a third part 113. The first part 111 has an open structure, the second part 112 has a linear structure, and the third part 113 has a closed annular structure. The operating assembly 2 includes a catheter assembly, a traction component 22, and an operating handle. The catheter assembly includes an outer sheath 211, a spring tube 212 passing through the outer sheath 211, and the traction component 22 passing through the spring tube 212. The distal end of the traction component 22 is provided with a hook 221. The operating handle is located at the proximal end of the catheter assembly and the traction component 22. Specifically, the operating handle includes a fixed base 231 located at the proximal end of the catheter assembly, an operating element 232 fixedly connected to the traction component 22 and slidably disposed on the fixed base 231 in the proximal-distal direction, and a blocking component detachably connected to the fixed base 231 for limiting the sliding of the operating element 232.
[0038] The ligation device of this embodiment has a first working state (the ligation ring is fully expanded and not released), a second working state (the ligation ring is tightened but not released), and a third working state (the ligation ring is tightened and released). When it is in the first working state, the first part 111 of the ligation ring body is located in the spring tube 212 and is connected to the hook 221 of the traction member 22, the sleeve 12 is located on the second part 112 and abuts against the distal end of the spring tube 212, and the third part 113 is in a fully open state; when it is in the second working state, the first part 111, the second part 112, and part of the third part 113 of the ligation ring body are located in the spring tube 212, and the first part 111 is connected to the hook of the traction member 22. With the sleeve 12 in place, the sleeve 12 is positioned on the third part 113 and abuts against the distal end of the spring tube 212, and the third part 113 is in a tightened state. In its third working state, the distal end of the traction component 22 extends beyond the distal end of the spring tube 212, and the ligation ring 1 separates from the operating assembly. Since the third part 113 is no longer constrained by the spring tube 212, it has a natural tendency to expand. The third part 113 is divided into two stable closed ring structures by the sleeve 12, thus maintaining a stable ligation effect. During use, the sliding of the operating component 232 drives the movement of the traction component 22, which in turn drives the ligation ring body to move, realizing the transition from the first working state to the second working state and from the second working state to the third working state.
[0039] In this embodiment, the ligation ring body is integrally injection molded from polyamide with shape memory function. It is axially symmetrical, with the axis of symmetry extending along the periphery. It exhibits high symmetry on both sides, allowing for synchronous contraction and preventing bending deformation. The first part 111 has both a naturally expanded state and a compressed state. When located within the spring tube 212, it is in a compressed state. In its naturally expanded state, the maximum outer diameter of the first part 111 is greater than the proximal inner diameter of the sleeve 12, preventing the sleeve 12 from detaching from the ligation ring body. In its compressed state, the maximum outer diameter of the first part 111 is equal to the inner diameter of the spring tube 212. The first part 111 is preferably annular or rhomboid in shape, facilitating the hook 221 to engage the ligation ring 1 and to quickly release it. The second part 112 has a square cross-section, providing higher strength and reducing the contact area with the inside of the spring tube 212. This reduces the frictional resistance generated when the ligation ring 1 moves within the spring tube 212, further reducing the risk of breakage. The third part 113 is a single wire structure bent to form a closed ring structure. The outer diameter of the wire is approximately equal to the radius of the inscribed circle of the cross-section of the second component. The distal end of the third part 113 has a V-shaped guide extending outward from the closed ring structure, facilitating the movement of the ligation ring 1 within the body and thus allowing for faster adjustment of the position of the ligation ring 1. The axial length of the sleeve 12 is approximately equal to the length of the second part 112. The sleeve 12 is made of hard silicone. The proximal end of the sleeve 12 has an annular protrusion 121 that extends from the proximal surface of the sleeve 12 away from the sleeve 12. The inner diameter of the annular protrusion 121 is equal to the inner diameter of the sleeve 12, and the outer diameter of the annular protrusion 121 is less than or equal to the inner diameter of the spring tube 212. The outer diameter of the sleeve 12 is greater than or equal to the outer diameter of the spring tube 212. Before the traction component 22 releases the ligation ring 1, the annular protrusion 121 is always inserted in the spring tube 212, and the proximal end of the sleeve 12 is always in contact with the distal end of the spring tube 212, so that the ligation ring 1 can quickly enter the spring tube 212 and tighten under the action of the traction component 22. At the same time, the sleeve 12 is always in contact with the distal end of the spring tube 212. The spring tube 212 and the sleeve 12 are concentric and coaxial, which can provide good support and avoid the dilemma of being stuck in the spring tube 212 due to the sleeve 12 getting stuck in the spring tube 212.
[0040] In this embodiment, the catheter assembly further includes an inner tube 213 fixedly connected to the operating handle and sleeved on the traction component 22. A connecting component 222 is fixedly connected to the distal end of the traction component 22, and the connecting component 222 is always located outside the distal end of the inner tube 213. The hook 221 is fixedly connected to the distal end of the connecting component 222. The inner tube 213 restricts the movement of the traction component 22, preventing direct contact between the traction component 22 and the spring tube 212, allowing the traction component 22 to move better within the spring tube 212. The connecting component 222 enhances the connection strength between the hook 221 and the traction component 22, and also restricts the movement of the hook 221 radially, preventing the hook 221 from scraping against the inner wall of the spring tube 212 or getting stuck on the spring tube, thus improving the smoothness of the hook 221's movement within the spring tube 212. The traction component 22 is made of stainless steel wire, and its proximal end is fixedly connected to the operating component 232. In this embodiment, the fixing base 231 is fixedly connected to the proximal end of the spring tube 212, and the outer sheath tube 211 is slidably connected to the fixing base 231. The outer sheath tube 211 is slidably fitted onto the spring tube 212 in the proximal-distal direction, allowing the ligation ring 1 to be retracted into the outer sheath tube 211. In this embodiment, the fixing base 231 is provided with a limiting groove 2311 extending in the proximal-distal direction. The operating member 232 is engaged with the limiting groove 2311, and the blocking member is detachably mounted on the fixing base 231. In this embodiment, the blocking member includes a first blocking member 2331, located on the outer sides of both ends of the operating member 232, limiting its sliding in the proximal direction, and a second blocking member 2332, limiting its sliding in the distal direction. The first blocking member 2331 can prevent premature tightening of the ligation ring 1 due to misoperation, and the second blocking member 2332 can prevent premature release of the ligation ring 1 due to misoperation. In this embodiment, the operating component 232 is a common finger ring that can be slidable by two fingers, and the first blocking component 2331 and the second blocking component 2332 are respectively limiting retaining rings. In this embodiment, the spring tube 212 is made of stainless steel, and the remaining conduit components are made of polymer materials.
[0041] The ligation ring 1 in this embodiment can also be used alone in other existing ligation devices. Compared with the existing ligation ring 1, it has the advantages of higher strength and less breakage.
[0042] The method of using the ligation device in this embodiment is as follows: Before entering the body, the ligation ring 1 is stored in the outer sheath tube 211. The operating member 232 is located at the far end of the upper limit groove 2311 of the fixed seat 231 and has not reached the farthest end of the limit groove 2311. A first blocking member 2331 is provided on the fixed seat 231 at the proximal end of the operating ring and a second blocking member 2332 is provided at the far end of the operating ring. After the endoscope enters the human body, the outer sheath 211 assembly is pulled back, and the third part 113 of the ligation ring 1 is released from the restriction of the outer pin tube and expands naturally, so that the ligation device is in the first working state. The position of the ligation ring 1 is adjusted to fit the wound. According to the actual needs of the surgery, several titanium clips are selectively sent into another channel of the endoscope and they are dispersed and anchored at the edge of the wound. Remove the first blocking component 2331, causing the operating component 232 to move proximally along the limiting groove 2311, which in turn moves the traction component 22 proximally, pulling the ligation ring body proximally. Since the sleeve 12 abuts against the distal end of the spring tube 212, the third part 113 of the ligation ring body gradually enters the spring tube 212 through the sleeve 12. The third part 113 located outside the spring tube 212 gradually tightens, and the ligation device switches to its second working state. During this process, the wound gradually closes completely. If titanium clips are used, several titanium clips can be seen stacked together under endoscopy. Remove the second blocking component 2332, allowing the operating component 232 to move along the limiting groove 2311 to the distal end of the limiting groove 2311. This causes the traction component 22 to move distally, pushing the ligation ring body distally. The sleeve 12 separates from the distal end of the spring tube 212, and the distal end of the traction component 22 extends out of the spring tube 212. After the hook 221 at the distal end of the traction component 22 is freed from the constraint of the first part 111 of the ligation ring body, the hook 221 can be easily disengaged from the first part 111, releasing the ligation ring 1. The ligation device then switches to the third working state. Since the third part 113 is freed from the constraint of the spring tube 212, both sides of the sleeve 12 have a natural expansion tendency. The third part 113 is divided into two stable closed ring structures by the sleeve 12, maintaining a stable ligation effect. The operating component 232 is moved again along the limiting groove 2311 towards the proximal end, which drives the traction component 22 to move towards the proximal end, and retracts the hook 221 at its distal end into the spring tube 212. Then the operating component 2 is withdrawn, while the ligation ring 1 remains in the body.
[0043] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A ligating device, characterized in that, It includes a separate ligation ring and an operating component. The ligation ring includes a ligation ring body and a sleeve movably fitted onto the ligation ring body. The ligation ring body is made of a material with shape memory function and includes an integrally formed first part, a second part, and a third part from its proximal end to its distal end. The first part has an open structure, the second part has a linear structure, and the third part has a closed ring structure. The cross-section of the second part perpendicular to its axis, the cross-section of the wire forming the first part perpendicular to its axis, and the cross-section of the wire forming the third part perpendicular to its axis are all rectangular. The operating assembly includes a catheter assembly, a traction component, and an operating handle. The catheter assembly includes an outer sheath and a spring tube passing through the outer sheath. The traction component is movably inserted through the spring tube in a proximal-distal direction, and a hook is provided at the distal end of the traction component. The operating handle includes a fixed base disposed at the proximal end of the catheter assembly, an operating element slidably disposed on the fixed base and fixedly connected to the traction component in a proximal-distal direction, and a blocking component detachably connected to the fixed base for limiting the sliding of the operating element. The hook can be connected to the opening structure, and the distal end of the spring tube can be connected to the proximal end of the sleeve. The traction component can drive the ligation ring body to move along the spring tube.
2. The ligating device of claim 1, wherein The ligation device has a first working state, a second working state, and a third working state. When it is in the first working state, the first part is located in the spring tube and the opening structure is connected to the hook, the sleeve is located on the second part and is connected to the spring tube, and the third part is in a fully open state; When it is in the second working state, the first part, the second part and part of the third part are located in the spring tube and the opening structure is connected to the hook. The sleeve is located on the third part and is connected to the spring tube. The third part is in a tightened state. When it is in the third working state, the distal end of the traction component extends beyond the distal end of the spring tube, the ligation ring is separated from the operating component, and the sleeve is located on the third part and divides the third part into two closed ring structures.
3. The ligating device of claim 1, wherein The first part has a naturally expanded state and a compressed state. When it is located in the spring tube, it is in the compressed state. The maximum outer diameter of the first part in the naturally expanded state is greater than the proximal inner diameter of the sleeve. The maximum outer diameter of the first part in the compressed state is equal to the inner diameter of the spring tube. The opening structure is more open in the naturally expanded state than in the compressed state. The first part has a circular or rhomboid structure in the naturally expanded state.
4. The ligating device of claim 1, wherein The ligation ring is axially symmetrical. And / or, the length of the sleeve in its axial direction is approximately equal to the length of the second portion; And / or, the distal end of the third portion has a V-shaped guide extending outwards from the closed annular structure.
5. The ligating device of claim 1, wherein The proximal end of the sleeve is provided with an annular protrusion, which extends from the proximal surface of the sleeve in a direction away from the sleeve. The inner diameter of the annular protrusion is approximately equal to the inner diameter of the sleeve, and the outer diameter of the annular protrusion is less than or equal to the inner diameter of the spring tube. The outer diameter of the sleeve is greater than or equal to the outer diameter of the spring tube.
6. The ligating device of claim 1, wherein, The catheter assembly also includes an inner tube that is fixedly connected to the operating handle and sleeved on the traction component. A connecting component is fixedly connected to the distal end of the traction component. The connecting component is always located outside the distal end of the inner tube. The hook is fixedly connected to the distal end of the connecting component.
7. The ligating device of claim 1, wherein The blocking component includes a first blocking component that limits its sliding in the proximal direction and a second blocking component that limits its sliding in the distal direction, respectively disposed on the outer sides of both ends of the operating component.
8. The ligating device of claim 7, wherein, The fixed base is provided with a limiting groove extending in the near-far direction, and the operating component is connected to the limiting groove.
9. The ligating device of claim 1, wherein, The sleeve is made of hard silicone. And / or, the ligation ring body is made of polyamide; And / or, the outer sheath is made of a polymer material; And / or, the spring tube is made of metal; And / or, the traction component is a stainless steel wire; And / or, the outer sheath is slidably fitted onto the spring tube in the proximal-remote direction, and the ligature ring can be retracted into the outer sheath.
10. A ligature ring for a ligature device, characterized by The ligation ring is the ligation ring described in any one of the ligation devices according to claims 1 to 9.