One-handed anal fistula ligator

Abstract

The application belongs to the technical field of medical devices, and particularly relates to a one-handed operation anal fistula ligation device, which comprises a shell structure, a negative pressure mechanism, a wire cutting mechanism, a wire wheel mechanism and a driving mechanism. The negative pressure mechanism comprises a negative pressure pipe. A ligation ring is sleeved on the front end of the negative pressure pipe and slides along the negative pressure pipe. The wire wheel mechanism comprises a wire wheel which is detachably connected to the negative pressure pipe. The driving mechanism comprises a trigger which is rotationally connected to the shell structure. The trigger is provided with a sector tooth and a movable swing piece with the rotation center as the center. The sector tooth is engaged with a driven gear which is rotationally connected to the shell structure. A center shaft is connected to the center of the driven gear. One end of the center shaft extends out of the shell structure and is detachably connected to the wire wheel, so that the driven gear, the center shaft and the wire wheel rotate synchronously. The winding of the rope wheel and the firing of the ligation ring are both performed by the driving mechanism, so that the device can be operated by one hand, thereby facilitating operation.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and specifically relates to a fistula ligation device that can be operated with one hand. Background Technology

[0002] The ligation device precisely ligates a high-strength, elastic rubber ring (elastic thread) at the root of the hemorrhoid (i.e., the pedicle of its blood supply vessel). After the elastic thread ligates the hemorrhoid, it blocks the blood supply, and the hemorrhoid will generally shrink, die, and fall off naturally in about 5-7 days. As the wound heals on its own, the scar contraction can also lift the loose mucosal tissue upward, playing a role in fixation and suspension. It is also effective in treating mild rectal mucosal laxity, prolapse, and rectocele.

[0003] Currently, there are many structural forms of banding devices in existing technologies. The most common structures include a shell structure, a negative pressure mechanism, a tangent mechanism, a thread wheel mechanism, and a drive mechanism. The negative pressure mechanism adsorbs the hemorrhoid, the drive mechanism fires the banding ring so that the coil at the end of the elastic thread is wrapped around the root of the hemorrhoid, the thread wheel mechanism winds up the elastic thread to tighten the coil at the end, the tangent mechanism cuts the elastic thread, the negative pressure mechanism releases the air and releases the negative pressure, and the banding device can be removed. This structure has a drawback: currently, the spools are generally fixed to the negative pressure pipe fittings. During the winding operation, one hand needs to hold the slinger while the other hand rotates the spool to complete the operation, which requires two hands and has certain limitations. Summary of the Invention

[0004] This invention provides a fistula ligation device that can be operated with one hand, which can solve the problems pointed out in the background art.

[0005] A fistula ligation device that can be operated with one hand includes a ligation device body, wherein the ligation device body includes a shell structure, a negative pressure mechanism, a tangent mechanism, a thread wheel mechanism, and a drive mechanism; The negative pressure mechanism includes a negative pressure pipe fitting; a ferrule is sleeved at the front end of the negative pressure pipe fitting, and the ferrule slides along the guide of the negative pressure pipe fitting; The reel structure includes a reel, which is detachably connected to the negative pressure fitting so that it can be removed. The driving mechanism includes a trigger rotatably connected to the housing structure. The trigger has sector teeth arranged around the rotation center and a movable rocker. The sector teeth mesh with a driven gear rotatably connected inside the housing structure. A central shaft is connected to the center of the driven gear. One end of the central shaft extends out of the housing structure and is detachably connected to the reel, so that the driven gear, the central shaft, and the reel rotate synchronously. The movable component is used to drive the bandage to slide outward.

[0006] Preferably, the trigger is rotatably connected to the housing structure via a rotating shaft, the driven gear is rotatably connected to the housing structure via a bearing assembly, the central shaft is a non-cylindrical shaft, and the inner side of the reel has a non-cylindrical insertion hole that engages with the non-cylindrical shaft. The non-cylindrical insertion allows for a detachable connection while preventing relative rotation between the two, thus achieving synchronous rotation under detachable connection.

[0007] Preferably, one side of the negative pressure fitting has a guide limiting groove, and the outer side of the guide limiting groove is symmetrically provided with limiting stops extending inward. The guide limiting groove is slidably connected to the tangent slider of the tangent mechanism. The tangent slider has a connecting hole that mates with the thread reel insertion tube. The insertion tube has the insertion hole. The outer circumference of the insertion tube has a first limiting protrusion arrayed in a circle. By rotating the thread reel, the first limiting protrusion can engage with and disengage from the limiting stops, so as to realize the detachable connection of the rotating thread reel.

[0008] Preferably, the tangent mechanism further includes a tangent push handle, a push rod assembly, and a tangent blade. The tangent push handle is slidably connected to the housing structure. The housing structure has a sliding limiting hole that reciprocates with the tangent push handle. The tangent push handle drives the push rod assembly to reciprocate. The end of the push rod assembly drives the tangent slider to move outward. The push rod assembly includes a push block connected to the tangent push handle and a tangent push rod. One end of the tangent push rod is connected to the push block, and the other end is used to push the tangent slider. A second compression spring is sleeved on the tangent push rod. The second compression spring is located between the push block and the compression spring limiting member. The compression spring limiting member is connected to the housing structure. The tangent slider has a tangent blade mounting hole. One end of the tangent blade is installed in the tangent blade mounting hole, and the other end is guided through a cutter guide hole. The cutter guide hole is located on the ferrule.

[0009] Preferably, the inner end of the ferrule is connected to a guide rod, and the negative pressure fitting has a guide rail that cooperates with the guide rod. The guide rail enables the ferrule to slide and to be pulled outward, thus separating it from the negative pressure fitting.

[0010] Preferably, the movable ornament drives the guide force transmission rod to move through a force transmission component. The force transmission component includes a guide sliding sleeve and a force transmission rod. The guide sliding sleeve is slidably connected to a negative pressure plug-in connecting pipe. The negative pressure plug-in connecting pipe is fixed inside the housing structure by a fixing member. The fixing member is sleeved on the negative pressure plug-in connecting pipe and fixedly connected to the housing structure by bolts. The force transmission rod provides sliding guidance through the fixing member. The outer end of the force transmission rod is detachably connected to the inner end of the guide force transmission rod. The inner end is connected to the guide sliding sleeve. The force transmission rod is sleeved with a first compression spring. The first compression spring is disposed between the fixing member and the guide sliding sleeve to provide a return force for the guide sliding sleeve. The movable ornament drives the guide sliding sleeve to slide outward.

[0011] Preferably, the negative pressure fitting is detachably connected to the housing structure.

[0012] Preferably, the inner end of the negative pressure fitting is provided with a connecting plate, and the connecting plate has a second limiting protrusion arranged in a circumferential array. The connecting end of the shell structure has a connecting limiting groove that connects and cooperates with the connecting plate. The connecting limiting groove is provided with a limiting ring groove that cooperates with the second limiting protrusion. The connecting limiting groove is provided with a guide groove for the second limiting protrusion to slide into and out of the limiting ring groove. The inner end of the negative pressure fitting is a negative pressure connecting end. The shell structure is provided with a negative pressure plug-in connecting pipe that is plugged into and connected to the negative pressure connecting end. The negative pressure plug-in connecting pipe has a sealing ring. The fixing member is connected to the negative pressure plug-in connecting pipe and fixed in the shell structure through a threaded hole. The guide sliding sleeve is sleeved on the negative pressure plug-in connecting pipe and slides back and forth along it.

[0013] Preferably, the inner end of the guide rod is provided with a connecting cone, and the outer end of the guide rod is provided with a connector. The connector is slidably connected to the connecting plate. The connector has a connecting groove that connects and mates with the connecting cone. The connecting groove is symmetrically provided with inclined limiting protrusions.

[0014] Preferably, the housing structure is provided with a negative pressure generator and a one-way exhaust valve. The negative pressure generator is connected to the one-way exhaust valve and a negative pressure plug-in connecting pipe in sequence through a connecting pipe. An exhaust pressing component is connected to the one-way exhaust valve, and the exhaust pressing component extends out of the housing structure.

[0015] Beneficial effects: The present invention provides an anal fistula ligation device that can be operated with one hand. The winding of the rope wheel and the firing of the ligation ring are both carried out by the drive mechanism, which makes it easy to operate with only one hand. Furthermore, the detachable connection structure between the negative pressure fitting and the housing structure, i.e. the handle, has been further optimized for adaptability, making it more convenient to operate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 2 This is a schematic diagram of the internal structure of the present invention. Figure 3 This is a schematic diagram of the internal structure of the gun body of the present invention. Figure 1 , Figure 4 This is a cross-sectional schematic diagram of the thread wheel and tangent slider of the present invention. Figure 5 This is a schematic diagram illustrating the structure and engagement of the central shaft and the reel in this invention. Figure 6 This is a partial schematic diagram of the connection between the negative pressure pipe fitting and the shell structure of the present invention. Figure 7 This is a partial structural schematic diagram of the negative pressure pipe fitting of the present invention. Figure 8 This is a schematic diagram of the internal structure of the gun body of the present invention. Figure 2 , Explanation of reference numerals in the attached figures: Figure labels: Shell structure 1; Connecting limiting groove 11; Limiting ring groove 111; Guide groove 112; Negative pressure fitting 21; Guide limiting groove 211; Limiting flange 212; Guide rail 213; Connecting disc 214; Second limiting protrusion 215; Looping ring 22; Cutter guide hole 221; Guide transmission rod 222; Connecting cone 223; Elastic wire guide hole fitting 224; Negative pressure insertion connecting pipe 23; Sealing ring 231; Negative pressure generator 24; One-way exhaust valve 25; Exhaust pressing component 26; Thread reel 31; Non-cylindrical insertion hole 311; Insertion pipe 312; First limiting protrusion 313; trigger 41; sector gear 411; movable swing element 412; rotating shaft 413; driven gear 42; bearing 421; central shaft 43; guide sliding sleeve 441; force transmission rod 442; fixing element 443; first compression spring 444; connector 445; connecting groove 446; inclined plane limiting protrusion 447; tension spring 45; tangent slider 51; connecting hole 511; tangent knife mounting hole 512; tangent push handle 61; push rod assembly 62; push block 621; tangent push rod 622; second compression spring 623; compression spring limiting element 624; tangent knife 63; sliding limiting hole 64. Detailed Implementation

[0017] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0018] Example 1: As Figure 1-8As shown, a fistula ligator that can be operated with one hand includes a ligator body, which includes a shell structure 1, a negative pressure mechanism, a tangent mechanism, a thread wheel mechanism, and a drive mechanism. The housing structure 1, i.e., the handheld gun housing, is generally divided into left and right parts, connected by bolts. The negative pressure mechanism includes a negative pressure pipe fitting 21; a sleeving ring 22 is sleeved on the front end of the negative pressure pipe fitting 21, and the sleeving ring 22 slides along the negative pressure pipe fitting 21. The reel structure includes a reel 31, which is detachably connected to the negative pressure pipe 21 so that it can be removed. Please see Figure 2-3 and Figure 5 As shown, the driving mechanism includes a trigger 41, which is rotatably connected to the housing structure 1. The trigger 41 has a sector tooth 411 arranged with the rotation center as the center and a movable swing member 412. The sector tooth 411 meshes with a driven gear 42 rotatably connected in the housing structure 1. A central shaft 43 is connected to the center of the driven gear 42. One end of the central shaft 43 extends out of the housing structure 1 and is detachably connected to the reel 31 so that the driven gear 42, the central shaft 43 and the reel 31 rotate synchronously. Specifically, the trigger 41 is rotatably connected to the housing structure 1 via a rotating shaft 413, and the driven gear 42 is rotatably connected to the housing structure 1 via a bearing 421 assembly. The central shaft 43 is a non-cylindrical shaft, which can be a polygonal shaft, a semi-circular shaft, a rectangular shaft, etc. The inner side of the reel 31 has a non-cylindrical insertion hole 311 that engages with the non-cylindrical shaft. The non-cylindrical insertion enables a detachable connection while preventing relative rotation between the two, thus achieving synchronous rotation under detachable connection.

[0019] The movable swing element 412 is used to drive the sling ring 22 to slide outward. The movable swing element 412 is a fan-shaped swing element with a guide sliding sleeve 441 on its front side. A tension spring 45 is provided between the movable swing element 412 and the shell structure 1 to help it return to its original position. The existing structure also uses this structure for returning to its original position.

[0020] Please see Figure 2 and Figure 4As shown, one side of the negative pressure fitting 21 has a guide limiting groove 211, and the outer side of the guide limiting groove 211 is symmetrically provided with limiting flanges 212 extending inward. The guide limiting groove 211 is slidably connected to the tangent slider 51 of the tangent mechanism. The tangent slider 51 has a connecting hole 511 that mates with the insertion tube 312 of the thread wheel 31. The insertion tube 312 has the insertion hole 311. The outer circumference of the insertion tube 312 has a circumferential array of first limiting protrusions 313. The rotating thread wheel 31 allows the first limiting protrusion 313 to engage with and disengage from the limiting stop 212, thus enabling the rotating thread wheel 31 to be detachably connected. When the insertion tube 312 is inserted into the connection hole 511, rotating the thread wheel 31 causes the first limiting protrusion 313 to engage with the limiting stop 212. Reverse rotation of the thread wheel 31 causes the first limiting protrusion 313 to disengage from the limiting stop 212. At this point, the rotating thread wheel 31 can be removed and inserted into a non-cylindrical shaft.

[0021] Please see Figure 2-3 and Figure 6 As shown, the tangent mechanism further includes a tangent push handle 61, a push rod assembly 62, and a tangent blade 63. The tangent push handle 61 is slidably connected to the housing structure 1. The housing structure 1 has a sliding limiting hole 64 that reciprocates with the tangent push handle 61. The tangent push handle 61 drives the push rod assembly 62 to reciprocate. The end of the push rod assembly 62 drives the tangent slider 51 to move outward. The push rod assembly 62 includes a push block 621 connected to the tangent push handle 61 and a tangent push rod 622. One end of the tangent push rod 622 is connected to the push block 621, and the other end is used to push the tangent slider 51. A second compression spring 623 is sleeved on the tangent push rod 622. The second compression spring 623 is located between the push block 621 and the compression spring limiting member 624. Between them, the compression spring limiting member 624 is connected to the housing structure 1. The tangent slider 51 is provided with a tangent knife mounting hole 512. One end of the tangent knife 63 is installed in the tangent knife mounting hole 512, and the other end is guided through the tangent knife guide hole 221. The tangent knife guide hole 221 is provided on the sleeve ring 22. The tangent knife guide hole 221 is also provided with an elastic wire guide hole 224. One end of the elastic wire guide hole 224 is connected and passes through the tangent knife guide hole 221, and the other end of the elastic wire guide hole 224 allows the elastic wire to pass through it, so that the tangent knife 63 can be aligned with the elastic wire and cut it. This structure is an existing structure and will not be described or shown in detail. The tangent mechanism pushes the tangent slider 51 to slide outward, and the tangent slider 51 drives the tangent knife 63 to cut the wire.

[0022] Specifically, the inner end of the ferrule 22 is connected to a guide rod 222, and the negative pressure fitting 21 has a guide rail 213 that cooperates with the guide rod 222. The guide rail 213 enables the ferrule 22 to slide outward and separate it from the negative pressure fitting 21, thus enabling the assembly and disassembly of the two.

[0023] Please see Figure 3 As shown, the movable ornament 412 drives the guide force transmission rod 222 to move through the force transmission assembly. The force transmission assembly includes a guide sliding sleeve 441 and a force transmission rod 442. The guide sliding sleeve 441 is slidably connected to the negative pressure plug-in connecting pipe 23. The negative pressure plug-in connecting pipe 23 is fixed inside the shell structure 1 by a fixing member 443. The fixing member 443 is sleeved on the negative pressure plug-in connecting pipe 23 and fixedly connected to the shell structure 1 by bolts. The force transmission rod 442 provides sliding guidance through the fixing member 443. There can be multiple force transmission rods 442. The outer end of the force transmission rod 442 is connected to the guide force transmission rod 222. The inner end of rod 222 is detachably connected to the guide sliding sleeve 441. The force transmission rod 442 is fitted with a first compression spring 444, which is located between the fixing member 443 and the guide sliding sleeve 441 to provide a return force for the guide sliding sleeve 441. The movable swing member 412 drives the guide sliding sleeve 441 to slide outward. The trigger 41 drives the movable swing member 412 to move, and the movable swing member 412 drives the guide sliding sleeve 441 and the force transmission rod 442 to slide outward, driving the guide force transmission rod 222 and the loop 22 to slide outward, so as to realize the function of the loop 22. Please see Figure 6As shown, the negative pressure fitting 21 is detachably connected to the shell structure 1. One end of the negative pressure fitting 21 has a connecting plate 214, on which a second limiting protrusion 215 is arranged in a circumferential array. The connecting end of the shell structure 1 has a connecting limiting groove 11 that connects and cooperates with the connecting plate 214. The connecting limiting groove 11 has a limiting ring groove 111 that cooperates with the second limiting protrusion 215. The connecting limiting groove 11 has a corresponding guide groove 112 for the second limiting protrusion 215 to slide into and out of the limiting ring groove 111. The inner end of the negative pressure fitting 21 is a negative pressure connecting end, and the shell structure 1 has a fitting for insertion into the negative pressure connecting end. The negative pressure plug-in connecting pipe 23 is connected, and the negative pressure plug-in connecting pipe 23 has a sealing ring 231. The negative pressure connection end connection hole is sealed with the sealing ring 231 by a stepped fit. The fixing member 443 is connected to the negative pressure plug-in connecting pipe 23 and fixed in the housing structure 1 through a threaded hole. The guide sliding sleeve 441 is sleeved on the negative pressure plug-in connecting pipe 23 and slides back and forth along it. The limiting ring groove 111 is provided with a positioning member or a positioning mark is provided between the negative pressure pipe 21 and the connection end of the housing structure 1 to make it in a predetermined connection position, so that the push rod assembly 62 corresponds with the tangential slider 51 and the force transmission rod 442 corresponds with the connector 445, etc.

[0024] Specifically, the inner end of the guide rod 222 is provided with a connecting cone 223, and the outer end of the force transmission rod 442 is provided with a connector 445. The connector 445 is slidably connected to the connecting plate 214. The connecting plate 214 is provided with a sliding guide hole at a corresponding position. The connector 445 has a connecting groove 446 that connects and cooperates with the connecting cone 223. The connecting groove 446 is symmetrically provided with inclined limiting protrusions 447.

[0025] Example 2: Based on Example 1, the housing structure 1 is provided with a negative pressure generator 24 and a one-way exhaust valve 25. The negative pressure generator 24 is connected to the one-way exhaust valve 25 and a negative pressure plug-in connecting pipe 23 in sequence through a connecting pipe. The negative pressure plug-in connecting pipe 23 is detachably connected to the negative pressure fitting 21. An exhaust pressing component 26 is connected to the one-way exhaust valve 25. The exhaust pressing component 26 extends out of the housing structure 1, so that the negative pressure generator 24 can be integrated into the housing structure 1, so that it does not need to be connected to an external negative pressure. The button or start button of the negative pressure generator 24 is located in the housing structure 1. It is used to start the negative pressure, and then the negative pressure is released by pressing the one-way exhaust valve 25 through the exhaust pressing component 26.

[0026] The working principle or operation method of this invention is as follows: since the negative pressure fitting 21 is generally a disposable tool, and the negative pressure fitting 21 and the shell structure 1 (the main body of the gun) are generally detachable, when in use, the negative pressure fitting 21 needs to be connected to the shell structure 1, the thread wheel 31 is removed from the negative pressure fitting 21 and inserted into the central shaft 43, and the negative pressure mechanism is activated by the button or key. The end of the negative pressure fitting 21 adsorbs the hemorrhoid, and the driving mechanism fires the ligating ring 22 so that the coil at the end of the elastic thread is wrapped around the root of the hemorrhoid. The thread wheel 31 is driven by the trigger 41 to wind up the elastic thread to tighten the coil at the end of the elastic thread. Then the elastic thread is cut by the cutting mechanism. The negative pressure mechanism releases the negative pressure by venting through the one-way exhaust valve 25, and the ligator can be removed.

[0027] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A single-handed anal fistula ligation device, comprising a ligation device body, wherein the ligation device body includes a shell structure (1), a negative pressure mechanism, a tangent mechanism, a thread wheel mechanism, and a drive mechanism; characterized in that: The negative pressure mechanism includes a negative pressure pipe fitting (21); a sleeving ring (22) is sleeved on the front end of the negative pressure pipe fitting (21), and the sleeving ring (22) slides along the guide of the negative pressure pipe fitting (21); The reel structure includes a reel (31), which is detachably connected to the negative pressure fitting (21) so that it can be removed; The drive mechanism includes a trigger (41), which is rotatably connected to the housing structure (1). The trigger (41) has a sector tooth (411) arranged with the rotation center as the center and a movable swing member (412). The sector tooth (411) meshes with a driven gear (42) rotatably connected in the housing structure (1). A central shaft (43) is connected to the center of the driven gear (42). One end of the central shaft (43) extends out of the housing structure (1) and is detachably connected to the reel (31) so that the driven gear (42), the central shaft (43) and the reel (31) rotate synchronously. The movable ornament (412) is used to drive the strapping ring (22) to slide outward.

2. The anal fistula ligation device that can be operated with one hand according to claim 1, characterized in that: The trigger (41) is rotatably connected to the housing structure (1) via a rotating shaft (413). The driven gear (42) is rotatably connected to the housing structure (1) via a bearing (421) assembly. The central shaft (43) is a non-cylindrical shaft. The inner side of the spool (31) has a non-cylindrical insertion hole (311) that engages with the non-cylindrical shaft. The non-cylindrical insertion enables a detachable connection while preventing relative rotation between the two, thus achieving synchronous rotation under detachable connection.

3. The anal fistula ligation device that can be operated with one hand according to claim 2, characterized in that: The negative pressure fitting (21) has a guide limiting groove (211) on one side. The guide limiting groove (211) is symmetrically provided with limiting stops (212) extending inward on the outer side. The guide limiting groove (211) is slidably connected to the tangent slider (51) of the tangent mechanism. The tangent slider (51) has a connecting hole (511) that cooperates with the insertion pipe (312) of the thread wheel (31). The insertion pipe (312) has the insertion hole (311). The outer circumference of the insertion pipe (312) has a first limiting protrusion (313) arranged in a circumferential array. By rotating the thread wheel (31), the first limiting protrusion (313) can be limited to cooperate with and be limited to separate from the limiting stop (212) so as to realize the detachable connection of the rotating thread wheel (31).

4. The anal fistula ligation device that can be operated with one hand according to claim 3, characterized in that: The tangent mechanism further includes a tangent push handle (61), a push rod assembly (62), and a tangent blade (63). The tangent push handle (61) is slidably connected to the housing structure (1). The housing structure (1) has a sliding limiting hole (64) that reciprocates with the tangent push handle (61). The tangent push handle (61) drives the push rod assembly (62) to reciprocate. The end of the push rod assembly (62) drives the tangent slider (51) to move outward. The push rod assembly (62) includes a push block (621) connected to the tangent push handle (61) and a tangent push rod (622). One end of the tangent push rod (622) is connected to the tangent slider (51). The push block (621) is connected, and the other end is used to push the tangent slider (51). The tangent push rod (622) is fitted with a second compression spring (623). The second compression spring (623) is located between the push block (621) and the compression spring limiting member (624). The compression spring limiting member (624) is connected to the housing structure (1). The tangent slider (51) is provided with a tangent knife mounting hole (512). One end of the tangent knife (63) is installed in the tangent knife mounting hole (512), and the other end is guided through the cutter guide hole (221). The cutter guide hole (221) is set on the sling ring (22).

5. The anal fistula ligation device that can be operated with one hand according to claim 4, characterized in that: The inner end of the sling (22) is connected to a guide rod (222), and the negative pressure pipe (21) has a guide rail (213) that cooperates with the guide rod (222). The guide rail (213) enables the sling (222) to slide outward and separate it from the negative pressure pipe (21).

6. The anal fistula ligation device that can be operated with one hand according to claim 5, characterized in that: The movable ornament (412) drives the guide force transmission rod (222) to move through the force transmission component. The force transmission component includes a guide sliding sleeve (441) and a force transmission rod (442). The guide sliding sleeve (441) is slidably connected to the negative pressure plug-in connecting pipe (23). The negative pressure plug-in connecting pipe (23) is fixed inside the shell structure (1) by a fixing member (443). The fixing member (443) is sleeved on the negative pressure plug-in connecting pipe (23) and fixedly connected to the shell structure (1) by bolts. The force transmission rod (442) is driven by the guide sliding sleeve (441) to move through the guide force transmission rod (222). The fixing member (443) provides a sliding guide. The outer end of the force transmission rod (442) is detachably connected to the inner end of the guide force transmission rod (222). The inner end is connected to the guide sliding sleeve (441). The force transmission rod (442) is fitted with a first compression spring (444). The first compression spring (444) is disposed between the fixing member (443) and the guide sliding sleeve (441) to provide a return force for the guide sliding sleeve (441). The movable swing member (412) drives the guide sliding sleeve (441) to slide outward.

7. A single-handed anal fistula ligation device according to claim 6, characterized in that: The negative pressure fitting (21) is detachably connected to the shell structure (1).

8. The anal fistula ligation device that can be operated with one hand according to claim 7, characterized in that: The negative pressure pipe fitting (21) has a connecting plate (214) on one end of its inner side. The connecting plate (214) has a second limiting protrusion (215) arranged in a circumferential array. The connecting end of the shell structure (1) has a connecting limiting groove (11) that connects and cooperates with the connecting plate (214). The connecting limiting groove (11) has a limiting ring groove (111) that cooperates with the second limiting protrusion (215). The connecting limiting groove (11) has a corresponding limiting ring groove (111) for the second limiting protrusion (215) to slide into and out of the limiting ring groove (111). The guide groove (112) of the negative pressure pipe fitting (21) is a negative pressure connection end. The shell structure (1) is provided with a negative pressure plug-in connection pipe (23) that is plugged into the negative pressure connection end. The negative pressure plug-in connection pipe (23) has a sealing ring (231). The fixing member (443) is connected to the negative pressure plug-in connection pipe (23) and fixed in the shell structure (1) through a threaded hole. The guide sliding sleeve (441) is sleeved on the negative pressure plug-in connection pipe (23) and slides back and forth along it.

9. A fistula ligation device operable with one hand according to claim 8, characterized in that: The inner end of the guide rod (222) is provided with a connecting cone (223), and the outer end of the force transmission rod (442) is provided with a connector (445). The connector (445) is slidably connected to the connecting plate (214). The connector (445) has a connecting groove (446) that connects and cooperates with the connecting cone (223). The connecting groove (446) is symmetrically provided with inclined limiting protrusions (447).

10. A single-handed anal fistula ligation device according to any one of claims 1-9, characterized in that: The housing structure (1) is provided with a negative pressure generator (24) and a one-way exhaust valve (25). The negative pressure generator (24) is connected to the one-way exhaust valve (25) and the negative pressure plug-in connecting pipe (23) in sequence through the connecting pipe. The one-way exhaust valve (25) is connected to an exhaust pressing component (26), which extends out of the housing structure (1).

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