Banding release mechanism and banding device

Abstract

This utility model provides a ligation release liner mechanism and a ligation device, relating to the field of medical device technology. The ligation release liner mechanism includes: a flexible cable and a flexible line connecting the flexible cable; the flexible cable is used to drive and connect to the actuator of the ligation device, and the flexible line is used to wind around a reel; the elongation rate of the flexible cable under a unit tensile force is less than that of the flexible line under a unit tensile force. Utilizing the flexibility of the flexible line, it is smoothly wound around the circumference of the reel, and the tensile force is transmitted through the flexible cable with a lower elongation rate, thereby reducing the overall elongation rate of the ligation release liner mechanism. This is particularly suitable for the tensile force transmission when the ligation device releases multiple ligation loops continuously, avoiding the problem of ligation loop release failure due to the release line being stretched and elongated.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a ligation release suture mechanism and a ligation device. Background Technology

[0002] Traditional ligation devices require on-site assembly by medical personnel (nurses) before use. First, the ligation device's lead wire is passed through the clamp channel, then hooked onto the pull cable of the loop assembly at the distal end of the endoscope. The pull cable is then pulled out of the proximal end of the endoscope, where it is assembled with the handle assembly. The loop assembly is then installed at the distal end of the endoscope. After assembly, the physician must check that the negative pressure effect is normal before use. This process typically takes 5 minutes, not only prolonging surgical preparation time but also potentially leading to device malfunctions or even potential medical risks due to human error during emergency or high-intensity clinical procedures. To optimize and improve surgical efficiency, the existing method requiring the physician to pass the pull cable through the endoscope clamp channel for on-site installation has been improved. Instead, the manufacturer pre-installs the pull cable outside the spring tube, running parallel to the endoscope. This eliminates the need for on-site installation by the physician, as all performance aspects, including loop release performance, system negative pressure function, and endoscope compatibility, are pre-checked, avoiding risks caused by physician error.

[0003] Existing technologies employ a pre-loaded design with multiple ligatures, allowing for sequential release of the ligatures during surgery, thus significantly shortening the operation time. However, the multiple-ligature release mechanism correspondingly increases the working stroke and stretching length of the release suture, potentially causing subsequent ligatures to fail to release due to excessive extension of the traction suture. Utility Model Content

[0004] The purpose of this invention is to provide a ligation release liner mechanism and a ligation device to alleviate the technical problem of excessively long release liner stretching in the prior art.

[0005] In a first aspect, the ligator release line mechanism provided by this utility model includes: a flexible cable and a trigger line; The flexible cable is connected to the trigger line, the trigger line is used to trigger and release the loop, and the flexible cable is used to drive the control handle. The elongation rate of the flexible cable under a unit tension is less than that of the trigger wire under a unit tension.

[0006] In conjunction with the first aspect, this utility model provides a first possible implementation of the first aspect, wherein the elongation of each meter of the flexible cable is less than 5 mm under a tensile force of 50 N.

[0007] In conjunction with the first aspect, this utility model provides a second possible implementation of the first aspect, wherein the elongation of each meter of the trigger wire under a tensile force of 50N is less than 20mm.

[0008] In conjunction with the first aspect, this utility model provides a third possible implementation of the first aspect, wherein the trigger line is provided with a plurality of release protrusions, and the plurality of release protrusions are spaced apart along the trigger line.

[0009] In conjunction with the third possible implementation of the first aspect, this utility model provides a fourth possible implementation of the first aspect, wherein the trigger line is folded in half to form a first branch line and a second branch line; both the first branch line and the second branch line are provided with a plurality of release protrusions; the line length between any two adjacent release protrusions on the first branch line is equal to the line length between any two adjacent release protrusions on the second branch line.

[0010] In conjunction with the third possible implementation of the first aspect, this utility model provides a fifth possible implementation of the first aspect, wherein the trigger line includes a first branch line and a second branch line; the distal end of the flexible cable is connected to a connector, and the proximal ends of the first branch line and the second branch line are both provided with a loop portion for connecting the connector; both the first branch line and the second branch line are provided with a plurality of release protrusions; the line length between any two adjacent release protrusions on the first branch line is equal to the line length between any two adjacent release protrusions on the second branch line.

[0011] In conjunction with the fourth or fifth possible implementation of the first aspect, this utility model provides a sixth possible implementation of the first aspect, wherein the number of the release protrusions on the first branch line and the second branch line is equal; With the first and second sub-lines unfolded in parallel, the release protrusions on the first and second sub-lines are arranged in a staggered manner.

[0012] In conjunction with the first aspect, this utility model provides a seventh possible implementation of the first aspect, wherein the flexible cable comprises a single metal wire; Alternatively, the flexible cable may be woven from multiple strands of metal wire; Alternatively, the flexible cable may be woven from metal wires and polymer threads.

[0013] In conjunction with the first aspect, this utility model provides an eighth possible implementation of the first aspect, wherein the ligator release line mechanism further includes a flexible line, the elongation of the flexible line under unit tension is greater than the elongation of the flexible cable under unit tension; The flexible line is used to connect to and wind around the reel of the control handle.

[0014] Secondly, the ligator provided by this utility model includes the ligator release line mechanism described in the first aspect, the control handle, and the actuator equipped with the ligating ring.

[0015] In conjunction with the second aspect, this utility model provides a first possible implementation of the second aspect, wherein the control handle includes a handle bracket and a spool rotatably connected to the handle bracket, and the flexible cable is connected to the spool; The handle bracket is detachably connected to the handle of the endoscope.

[0016] In conjunction with the first possible implementation of the second aspect, the present invention provides a second possible implementation of the second aspect, wherein the actuator includes: a base and a ferrule sleeved on the base; The substrate is detachably connected to the distal end of the endoscope.

[0017] In conjunction with the second possible implementation of the second aspect, the present invention provides a third possible implementation of the second aspect, wherein the flexible cable passes through a conduit extending from the base to the handle bracket; The conduit includes: a polymer tube or a spring tube with an inner lining.

[0018] In conjunction with the second possible implementation of the second aspect, the present invention provides a fourth possible implementation of the second aspect, wherein the substrate comprises: a transparent cap and an elastic cap connected to the proximal end of the transparent cap; The transparent cap is provided with a plurality of ligatures along the axial direction, and the elastic cap is fitted onto the distal end of the endoscope.

[0019] In conjunction with the fourth possible implementation of the second aspect, this utility model provides a fifth possible implementation of the second aspect, wherein the transparent cap includes: a ring mounting portion and a ring release portion located at the distal end of the ring mounting portion; Multiple ligatures are fitted onto the ligature mounting portion, and the endoscope lens passes through the elastic cap and extends to the inside of the ligature mounting portion; The ring release section has a tapered section whose outer diameter decreases from the proximal end to the distal end.

[0020] The present invention provides the following advantages: It employs a flexible cable and a flexible line connecting the flexible cable, and connects the actuator of the ligator via the flexible cable drive. The flexible line is wound around the reel. The elongation rate of the flexible cable under a unit tension is less than that of the flexible line under a unit tension. The flexibility of the flexible line allows it to be smoothly wound around the circumference of the reel, and the tension is transmitted through the flexible cable with a lower elongation rate, thereby reducing the overall elongation rate of the ligator's release line mechanism. This is particularly suitable for the tension transmission when the ligator continuously releases multiple ligatures, and can avoid the problem of ligature release failure caused by the release line being stretched.

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a ligation release suture mechanism provided for an embodiment of this utility model; Figure 2 A schematic diagram of another ligature release liner mechanism provided in an embodiment of this utility model; Figure 3 A schematic diagram of the ligator provided in an embodiment of this utility model; Figure 4 This is a partially enlarged schematic diagram of the ligation device provided in an embodiment of the present invention.

[0024] Icons: 100-Flexible cable; 101-Distant connector; 102-Proximal end; 200-Flexible line; 300-Trigger line; 301-Release protrusion; 302-Loop section; 310-First branch line; 320-Second branch line; 400-Actuator; 410-Base; 411-Transparent cap; 4111-Loop mounting part; 4112-Loop release part; 412-Elastic cap; 420-Loop ring; 500-Control handle; 510-Spindle; 520-Handle bracket; 600-Cable conduit. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," and "third" are only used to describe differences in name and should not be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities of the International System of Units (SI) base units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. The terms "proximal end" and "distal end" are used with reference to the product operator. The proximal end is the end located outside the body and can be held by hand, while the distal end is the end that can be implanted in the patient's body and is away from the operator. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the ligator release mechanism provided in this embodiment of the present invention includes: a flexible cable 100 and a trigger line 300; the flexible cable 100 is connected to the trigger line 300, the trigger line 300 is used to trigger and release the ligator ring 420, and the flexible cable 100 is used to drive and connect the control handle 500; the elongation rate of the flexible cable 100 under a unit tensile force is less than the elongation rate of the trigger line 300 under a unit tensile force.

[0029] The trigger line 300 can be made of a flexible polymer material. The trigger line 300 is easier to bend than the flexible cable 100, thus facilitating its extension to the distal end of the actuator 400 and its connection to the locking rings 420. The flexible cable 100 extends from the control handle 500 to the actuator 400. The overall length of the flexible cable 100 is greater than the length of the trigger line 300. With the flexible cable 100 having a lower elongation rate, the trigger line 300 can sequentially drive the release of multiple locking rings 420, preventing the locking rings 420 from failing to release due to excessive stretching of the flexible cable 100.

[0030] In an optional implementation, the elongation of each meter of flexible cable 100 under a tension of 50N is less than 5mm. With a low elongation rate of flexible cable 100, excessive stretching of flexible cable 100 when it is pulled can be avoided.

[0031] In an optional embodiment, the elongation of each meter of trigger line 300 under a 50N tensile force is less than 20mm. The trigger line 300 is more flexible than the flexible cable 100, and it is more easily stretched under tension; typically, the elongation of each meter of trigger line 300 under a 50N tensile force is greater than 6mm.

[0032] See Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the trigger line 300 is provided with a plurality of release protrusions 301, which are spaced apart along the trigger line 300.

[0033] The release protrusion 301 can be configured as a knot or bead on the trigger line 300. The trigger line 300 can pass through the transparent cap 411 from the proximal end and extend to the distal end, and then extend from the outside of the transparent cap 411 to the proximal end. Each loop 420 fitted on the transparent cap 411 has a release protrusion 301 at its proximal end. When the trigger line 300 inside the transparent cap 411 is pulled by the flexible cable 100, the loop 420 will be pushed to the distal end by the release protrusion 301, thereby causing the loop 420 to be peeled off from the transparent cap 411, thus realizing the release of the loop 420.

[0034] See Figure 1In an optional embodiment, the trigger line 300 includes a first branch line 310 and a second branch line 320; the distal end of the flexible cable 100 is connected to a distal connector 101, and the proximal ends of both the first branch line 310 and the second branch line 320 are provided with loop portions 302 for connecting to the distal connector 101; both the first branch line 310 and the second branch line 320 are provided with multiple release protrusions 301; the line length between any two adjacent release protrusions 301 on the first branch line 310 is equal to the line length between any two adjacent release protrusions 301 on the second branch line 320. The distal connector 101 may be configured with a ring structure, and this ring structure hooks onto the loop portion 302, thereby enabling the flexible cable 100 to connect the first branch line 310 and the second branch line 320. When the flexible cable 100 is pulled proximally, the first branch line 310 and the second branch line 320 can be pulled simultaneously, and the two release protrusions 301 abutting the farthest loop 420 will be driven simultaneously, thereby releasing the loop 420. Subsequently, the flexible cable 100 is pulled until the first branch line 310 and the second branch line 320 drive the two release protrusions 301 on the proximal side of the next loop 420, thus releasing the loop 420. By continuing to pull the flexible cable 100, multiple loops 420 can be released sequentially.

[0035] Furthermore, the proximal end of the flexible cable 100 is connected to a proximal end 102. A slot can be provided around the circumference of the reel 510 of the control handle 500. The flexible cable 100 is inserted from one end of the slot and the proximal end 102 is engaged with the other end of the slot, thereby fixing the flexible cable 100 to the reel 510. The flexible cable 100 can be wound around the reel 510.

[0036] See Figure 2 In another optional embodiment, the trigger line 300 is folded in half to form a first branch line 310 and a second branch line 320. Both the first branch line 310 and the second branch line 320 are provided with multiple release protrusions 301. The length between any two adjacent release protrusions 301 on the first branch line 310 is equal to the length between any two adjacent release protrusions 301 on the second branch line 320. When the trigger line 300 is pulled by the flexible cable 100, the first branch line 310 and the second branch line 320 are pulled simultaneously, and the two release protrusions 301 abutting against the farthest loop 420 are simultaneously driven, thereby releasing the loop 420.

[0037] See Figure 2 , Figure 3 and Figure 4In an optional embodiment, the number of release protrusions 301 on the first branch line 310 and the second branch line 320 is equal. When the first branch line 310 and the second branch line 320 are unfolded in parallel, the release protrusions 301 on the first branch line 310 and the second branch line 320 are staggered one by one. During assembly, the first branch line 310 and the second branch line 320 can be simultaneously inserted into the conduit 600. During this process, the release protrusions 301 on the first branch line 310 and the second branch line 320 are staggered one by one, which can prevent two release protrusions 301 from stacking together. Therefore, a conduit 600 with a smaller inner diameter can be used. The release protrusions 301 can be beads with a diameter of 0.2 mm, and the conduit 600 can be a spring tube with an inner diameter of 1.8 mm. When inserting the first branch line 310 and the second branch line 320, the multiple release protrusions 301 are staggered, which can prevent two release protrusions 301 from being stuck side-by-side inside the conduit 600. In the case where the first dividing line 310 and the second dividing line 320 are unfolded in parallel, the distance between two adjacent release protrusions 301 on the first dividing line 310 and the second dividing line 320 is usually less than 2mm and should not exceed 5mm. In order to enable the two release protrusions 301 corresponding to the first dividing line 310 and the second dividing line 320 to act on the same tie ring 420 at the same time, the first dividing line 310 and the second dividing line 320 should both extend a certain distance around the base 410 to adjust the position of the release protrusions 301 and ensure that the first dividing line 310 and the second dividing line 320 can simultaneously trigger the two corresponding release protrusions 301.

[0038] See Figure 1 and Figure 2 The flexible cable 100 includes a single metal wire, and by using the single metal wire as the flexible cable 100, it has a small elongation.

[0039] In an optional embodiment, the flexible cable 100 may also be woven from multiple strands of metal wire. The flexible cable 100 may be configured as a 1×7 cable, a 3×3 cable, a 1×19 cable, etc., and has a low elongation rate.

[0040] See Figure 1 , Figure 2 and Figure 3 In another alternative embodiment, the flexible cable 100 is woven from metal wire and polymer thread, which has a low elongation rate and makes the flexible cable 100 more flexible and bendable, so that the flexible cable 100 wound on the spool 510 fits more closely to the circumferential surface of the spool 510.

[0041] See Figure 2 and Figure 3As shown, the release mechanism of the cable tie also includes a flexible wire 200. The elongation of the flexible wire 200 under a unit tension is greater than that of the flexible cable 100 under a unit tension. The flexible wire 200 is used to connect to and wind around the spool 510 of the control handle 500. When the flexible cable 100 is made of a single metal wire or multiple metal wires, the flexible wire 200 made of polymer material is wound around the spool 510. The flexible wire 200 fits more tightly to the circumference of the spool 510. By rotating the spool 510, the flexible wire 200 is contracted, thereby pulling the flexible cable 100, which can ensure that the distance the flexible cable 100 is pulled is more accurate.

[0042] like Figure 3 As shown, the ligator provided in this embodiment includes the ligator release mechanism described in the above embodiments, a control handle 500, and an actuator 400 equipped with ligating rings 420. This ligator uses the ligator release mechanism described in the above embodiments to transmit power from the control handle 500 to the ligating rings 420 of the actuator 400, enabling precise release of the ligating rings 420, and is particularly suitable for situations where the actuator 400 is equipped with multiple ligating rings 420.

[0043] In this embodiment of the invention, the control handle 500 includes a handle bracket 520 and a spool 510 rotatably connected to the handle bracket 520, with a flexible cable 100 connected to the spool 510; the handle bracket 520 is detachably connected to the endoscope handle. The handle bracket 520 and the endoscope handle are detachably connected by means of snap-fit, bolts, or other methods, facilitating the assembly of the ligator onto the endoscope for use.

[0044] Furthermore, the actuator 400 includes a base 410 and a ferrule 420 sleeved on the base 410; the base 410 is detachably connected to the distal end of the endoscope. The base 410 can be detachably connected to the distal end of the endoscope using a snap-fit ​​or threaded connection, thereby achieving a combined connection between the actuator 400 and the endoscope.

[0045] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the flexible cable 100 passes through a conduit 600 extending from the base 410 to the handle bracket 520; the conduit 600 includes a polymer tube or a spring tube with an inner liner. The flexible cable 100 is fitted with a gap within the polymer tube, or the inner liner reduces the gap in the flexible cable 100 within the spring tube, thereby improving the stability of the flexible cable 100 and facilitating more accurate release of the ferrule 420.

[0046] In this embodiment, the substrate 410 includes a transparent cap 411 and an elastic cap 412 connected to the proximal end of the transparent cap 411. Multiple ligature rings 420 are sequentially fitted onto the transparent cap 411 along its axial direction, and the elastic cap 412 is fitted onto the distal end of the endoscope. The elastic cap 412 is interference-fitted to the distal end of the endoscope, allowing the endoscope to obtain image information through the circumference and axial distal end of the transparent cap 411.

[0047] Furthermore, the transparent cap 411 includes: a loop mounting portion 4111 and a loop release portion 4112 located at the distal end of the loop mounting portion 4111; a plurality of loops 420 are fitted onto the loop mounting portion 4111, and the lens of the endoscope passes through the elastic cap 412 and extends to the inside of the loop mounting portion 4111; the loop release portion 4112 has a tapered section with a decreasing outer diameter from the proximal end to the distal end.

[0048] The first dividing line 310 and the second dividing line 320 extend from the inner side of the base 410 to the distal end and fold back from the outer wall of the base 410 to its proximal end. Each loop 420 abuts against two release protrusions 301 at its proximal end. When the loop 420 is not released, the lens can acquire images through the loop release part 4112 and the distal opening of the loop release part 4112; when the loop 420 is released, the flexible cable 100 pulls the first dividing line 310 and the second dividing line 320 towards the proximal end, and the multiple loops 420 arranged sequentially from the distal end to the proximal end will be pushed towards the distal end one by one by the corresponding release protrusions 301. The loops 420 that slide from the loop mounting part 4111 to the loop release part 4112 will slide down more easily to the distal end, thereby ensuring that the loops 420 can be released smoothly one by one.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A ligation device release wire mechanism, characterized by, include: Flexible cable (100) and trigger line (300); The flexible cable (100) is connected to the trigger line (300), the trigger line (300) is used to trigger and release the loop (420), and the flexible cable (100) is used to drive the control handle (500). The elongation rate of the flexible cable (100) under a unit tension is less than that of the trigger line (300) under a unit tension.

2. The ligator release wire mechanism of claim 1, wherein, The elongation of each meter of the flexible cable (100) is less than 5 mm under a tensile force of 50 N.

3. The ligator release wire mechanism of claim 1, wherein, The elongation of each meter of the trigger wire (300) under a tensile force of 50N is less than 20mm.

4. The ligator release wire mechanism of claim 1, wherein, The trigger line (300) is provided with a plurality of release protrusions (301), and the plurality of release protrusions (301) are spaced apart along the trigger line (300).

5. The ligator release wire mechanism of claim 4, wherein, The trigger line (300) is folded in half to form a first branch line (310) and a second branch line (320); Both the first branch line (310) and the second branch line (320) are provided with multiple release protrusions (301). The line length between any two adjacent release protrusions (301) on the first dividing line (310) is equal to the line length between any two adjacent release protrusions (301) on the second dividing line (320).

6. The ligation release suture mechanism according to claim 4, characterized in that, The trigger line (300) includes a first branch line (310) and a second branch line (320); The flexible cable (100) is connected to a distal connector (101) at its distal end, and the proximal ends of the first branch line (310) and the second branch line (320) are both provided with a loop (302) for connecting to the distal connector (101). Both the first branch line (310) and the second branch line (320) are provided with multiple release protrusions (301). The line length between any two adjacent release protrusions (301) on the first dividing line (310) is equal to the line length between any two adjacent release protrusions (301) on the second dividing line (320).

7. The ligator release suture mechanism according to claim 5 or 6, characterized in that, The number of release protrusions (301) on the first dividing line (310) and the second dividing line (320) is equal; With the first branch line (310) and the second branch line (320) unfolded in parallel, the release protrusions (301) on the first branch line (310) and the second branch line (320) are arranged in a staggered manner.

8. The ligature release suture mechanism according to claim 1, characterized in that, The flexible cable (100) comprises a single metal wire; Alternatively, the flexible cable (100) may be woven from multiple strands of metal wire; Alternatively, the flexible cable (100) may be woven from metal wires and polymer threads.

9. The ligature release mechanism according to claim 1, characterized in that, The ligature release mechanism further includes a flexible wire (200), the elongation of which under a unit tensile force is greater than that of the flexible cable (100) under a unit tensile force; The flexible line (200) is used to connect to and wind around the reel (510) of the control handle (500).

10. A ligation device, characterized in that, It includes the ligature release line mechanism as described in any one of claims 1-9, the control handle (500), and the actuator (400) equipped with the ligature ring (420).

11. The ligation device according to claim 10, characterized in that, The control handle (500) includes a handle bracket (520) and a spool (510) rotatably connected to the handle bracket (520), and the flexible cable (100) is connected to the spool (510); The handle bracket (520) is detachably connected to the handle of the endoscope.

12. The ligation device according to claim 11, characterized in that, The actuator (400) includes: a base (410) and a ferrule (420) sleeved on the base (410). The substrate (410) is detachably connected to the distal end of the endoscope.

13. The ligation device according to claim 12, characterized in that, The flexible cable (100) passes through a conduit (600) extending from the base (410) to the handle bracket (520). The conduit (600) includes: a polymer tube or a spring tube with an inner lining.

14. The ligation device according to claim 12, characterized in that, The substrate (410) includes: a transparent cap (411) and an elastic cap (412) connected to the proximal end of the transparent cap (411). The transparent cap (411) is provided with a plurality of the ligature rings (420) sequentially along the axial direction, and the elastic cap (412) is provided at the distal end of the endoscope.

15. The ligation device according to claim 14, characterized in that, The transparent cap (411) includes: a ring mounting part (4111) and a ring release part (4112) located at the distal end of the ring mounting part (4111). Multiple ligatures (420) are fitted onto the ligature mounting portion (4111), and the lens of the endoscope passes through the elastic cap (412) and extends to the inside of the ligature mounting portion (4111). The ring release section (4112) has a tapered section whose outer diameter decreases from the proximal end to the distal end.

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