Endoscopic esophageal varicosity ligation device

Abstract

The invention discloses an esophageal varicosity ligation device under an endoscope, and relates to the technical field of medical instruments, the esophageal varicosity ligation device comprises a ligation outer tube, the inner side of the ligation outer tube is hermetically connected with a ligation inner tube, and an endoscope connecting seat is fixed at one end of the ligation outer tube far away from the joint of the ligation outer tube and the ligation inner tube; the elastic telescopic rods with different lengths penetrate through the side wall of the loop ligature outer tube in a sliding mode, the limiting blocks used for limiting the rubber rings are fixed to the elastic telescopic rods, meanwhile, the pneumatic traction mechanism drives the pulling plate to drive the elastic telescopic rods and the limiting blocks to move synchronously, and therefore the limiting blocks can be synchronously controlled and do not need to be controlled separately; compared with traditional manual operation, pneumatic control is more labor-saving and easy to operate, and convenience is brought to surgical operation, in addition, the endoscope connecting base of the device and the endoscope tail end hard pipe of endoscope equipment are fixedly installed together through the spiral locking mechanism, and the endoscope tail end hard pipe is not prone to falling off. Therefore, the connection stability can be ensured while the device and the endoscope equipment are convenient to disassemble and assemble.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an endoscopic esophageal varices ligation device. Background Art

[0002] Hepatitis B (HBV) is an infectious disease caused by the hepatitis B virus, mainly characterized by liver lesions. Its core hazard is that chronic infection can lead to cirrhosis, portal hypertension and hepatocellular carcinoma. It requires clear diagnosis through laboratory tests (serum markers, viral load) and long-term standardized antiviral treatment to delay disease progression. Hepatitis B virus infection is an important cause of cirrhosis and portal hypertension, and esophageal varices caused by portal hypertension are the main indications for endoscopic esophageal variceal ligation (EVL).

[0003] Endoscopic esophageal variceal ligation is an interventional treatment method based on the corresponding endoscopic esophageal variceal ligation device. It uses elastic rubber bands under endoscopic guidance to ligate varicose veins, causing ischemia, necrosis and scar formation, thereby preventing and controlling esophageal variceal bleeding. Its core applications include acute bleeding control, secondary prevention and primary prevention for high-risk patients. It has the advantages of relatively simple operation and fewer complications.

[0004] Most of the existing endoscopic esophageal varicose vein ligation devices have a simple structure. Although they can achieve continuous ligation of rubber rings, the limiting mechanisms for each rubber ring are mostly split structures, which requires separate control. Not only does it rely on manual operation, but the operation is cumbersome and not convenient. In addition, the device body and the end of the endoscopic device are generally directly sleeved or bonded, which cannot ensure that the device body and the endoscopic device are easy to disassemble and assemble while ensuring the connection is firm, making it inconvenient to use. Therefore, the present invention proposes an endoscopic esophageal varicose vein ligation device to solve the problems existing in the prior art. Summary of the Invention

[0005] In response to the above problems, the purpose of the present invention is to propose an endoscopic esophageal varicose vein ligation device to solve the problems that the various limiting mechanisms for the rubber rings of the existing endoscopic esophageal varicose vein ligation devices are mostly split structures, need to be controlled separately, waste manpower and are cumbersome to operate, and cannot ensure the connection between the device body and the endoscopic equipment while ensuring easy disassembly and assembly during installation.

[0006] In order to achieve the objectives of the present invention, the present invention is implemented through the following technical solutions: an endoscopic esophageal varicose vein ligation device, comprising an outer ligation tube, the inner side of the outer ligation tube is sealedly connected to the inner ligation tube, the end of the outer ligation tube away from the connection with the inner ligation tube is fixed with an endoscope connecting seat, the end of the endoscope connecting seat away from the inner ligation tube is sealed and connected to the endoscope end hard tube through a spiral locking mechanism, the end of the inner ligation tube close to the endoscope end hard tube is sealed and connected to a negative pressure suction tube, the end of the negative pressure suction tube away from the inner ligation tube passes through the endoscope connecting seat and the endoscope end hard tube, elastic telescopic rods are equidistantly passed through the upper and lower outer walls of the outer ligation tube, a limit block is fixed at one end of the elastic telescopic rod located outside the outer ligation tube, and rubber rings adapted to the position of the limit block are equidistantly sleeved on the outer side of the outer ligation tube, the upper and lower inner walls of the outer ligation tube are connected to a pull plate driven to move by a pneumatic traction mechanism through a limit spring, and the end of the elastic telescopic rod located inside the outer ligation tube is fixedly connected to the pull plate.

[0007] Further improvements are: the spiral locking mechanism includes a connecting ring that is slidably sleeved on the outside of the endoscope connecting seat and an external thread opened on the outer wall of the hard tube at the end of the endoscope, the inner wall of the connecting ring close to the side of the hard tube at the end of the endoscope is provided with an internal thread that is adapted to the external thread, the outer wall of the endoscope connecting seat is fixed with a limiting convex ring, and the middle position of the inner wall of the connecting ring is provided with a limiting groove that is adapted to the limiting convex ring.

[0008] A further improvement is that a docking guide ring is fixed to the inner wall of the endoscope connecting seat close to the endoscope end hard tube, and a first sealing groove is opened on the opposite side of the endoscope connecting seat and the endoscope end hard tube, and a first sealing ring is embedded between the two groups of the first sealing grooves.

[0009] A further improvement is that a threaded connection groove is provided on the side of the inner tube of the ligation tube close to the hard tube at the end of the endoscope, a docking ring is fixed to the end of the negative pressure suction tube close to the inner tube of the ligation tube, and a threaded connection tube is fixed to the end of the docking ring close to the inner tube of the ligation tube, which is connected to the negative pressure suction tube and adapted to the threaded connection groove.

[0010] A further improvement is that a second sealing ring is fixed to one end of the docking ring close to the ligature inner tube, and a second sealing groove adapted to the second sealing ring is provided on one side of the ligature inner tube close to the docking ring.

[0011] A further improvement is that the elastic telescopic rod includes a sleeve that slides through the side wall of the outer tube and a sliding rod fixedly connected to the pull plate. The end of the sliding rod away from the pull plate slides through the inside of the sleeve and is fixed with a baffle. A linear spring is fixed between the baffle and the inner wall of the sleeve and is sleeved on the outside of the sliding rod.

[0012] Further improvements are: the pneumatic traction mechanism includes a pneumatic cavity fixed to the inner wall of the ligature outer tube and a pneumatic diaphragm fixed to the inner wall of the pneumatic cavity, a steel wire rope is fixed between the outer wall of the pneumatic diaphragm close to the pull plate and the pull plate, a negative pressure air tube is fixed to the side wall of the pneumatic cavity away from the pneumatic diaphragm, and the end of the negative pressure air tube away from the pneumatic diaphragm passes through the endoscope connecting seat and the hard tube at the end of the endoscope.

[0013] Further improvements are: a pulley adapted to the steel wire rope is symmetrically fixed inside the outer tube of the ligation, the end of the steel wire rope away from the pneumatic diaphragm passes through the pulley and is fixedly connected to the pull plate, and a receiving groove adapted to the limit block is provided on the outer wall of the outer tube of the ligation, and the length of each of the elastic telescopic rods distributed at equal distances increases sequentially from left to right.

[0014] The beneficial effects of the present invention are as follows: the present invention slides elastic telescopic rods of different lengths through the side wall of the ligature outer tube, and fixes limit blocks for rubber ring limitation on the elastic telescopic rods, and at the same time drives the pull plate through the pneumatic traction mechanism to drive the elastic telescopic rods and the limit blocks to move synchronously, so that the limit blocks can be controlled synchronously without the need for separate operation, and the pneumatic operation is more labor-saving and simple to operate than traditional manual operation, which brings convenience to surgical operation. In addition, the endoscope connecting seat of the device is fixedly installed with the endoscope end hard tube of the endoscopic equipment through the spiral locking mechanism, so that the device and the endoscopic equipment can ensure connection stability while being easy to disassemble and assemble, and are easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of the present invention;

[0016] Figure 2 is a front cross-sectional view of the present invention;

[0017] Figure 3 The present invention Figure 2 A magnified view of point A in the figure;

[0018] Figure 4 The present invention Figure 2 Enlarged view of point B in FIG.

[0019] Figure 5 The present invention Figure 2 Enlarged view of point C in the figure;

[0020] Figure 6 is a cross-sectional view of the elastic telescopic rod of the present invention;

[0021] Figure 7 It is a schematic diagram of the three-dimensional structure of the elastic telescopic rod of the present invention.

[0022] Among them: 1. ligature outer tube; 2. ligature inner tube; 3. endoscope connecting seat; 4. rigid tube at the end of endoscope; 5. negative pressure suction tube; 6. elastic telescopic rod; 7. limit block; 8. rubber ring; 9. limit spring; 10. pull plate; 11. connecting ring; 12. external thread; 13. limit convex ring; 14. limit groove; 15. docking guide ring; 16. first sealing groove; 17. first sealing ring; 18. threaded connection groove; 19. docking ring; 20. threaded connection tube; 21. second sealing ring; 22. second sealing groove; 23. sleeve; 24. slide rod; 25. baffle; 26. linear spring; 27. pneumatic cavity; 28. pneumatic diaphragm; 29. wire rope; 30. negative pressure air tube; 31. pulley; 32. receiving groove. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] Endoscopic esophageal varicose vein ligation is a procedure that uses a ligation device equipped with one or more rubber ligation rings to ligate varicose veins in sections and at points under endoscopy, thereby achieving the purpose of hemostasis and causing the varicose veins to shrink and eventually disappear. It is the first choice for gastroesophageal varices. Current endoscopic esophageal varicose vein ligation devices mainly use multi-shot ligation devices that can perform continuous ligation, which can perform continuous ligation after being inserted into the esophagus, greatly improving medical efficiency.

[0025] according to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7As shown, this embodiment provides an endoscopic esophageal varicose vein ligation device, comprising an outer ligation tube 1 with an opening at the right end and an inner ligation tube 2 located inside the outer ligation tube 1 and sealedly connected to the outer ligation tube 1. The left ends of the outer ligation tube 1 and the inner ligation tube 2 are connected together, and a negative pressure chamber for accommodating the ligated tissue is formed inside the inner ligation tube 2. An endoscope connecting seat 3 communicating with the outer ligation tube 1 and having an opening at the right end is fixed to the right end of the endoscope connecting seat 3, and a hard end of the endoscope is sealed and docked at the right end of the endoscope. Tube 4, the endoscope end hard tube 4 is fixed to the end of the insertion part of the endoscope device, and the endoscope connecting seat 3 and the endoscope end hard tube 4 are detachably fixed by a spiral locking mechanism. The right end of the ligation inner tube 2 is sealed and connected with a negative pressure suction tube 5. The end of the negative pressure suction tube 5 away from the ligation inner tube 2 passes through the endoscope connecting seat 3 and the endoscope end hard tube 4, extends to the handle of the endoscope device and is connected to an external negative pressure device, so as to evacuate the ligation inner tube 2, form a negative pressure, and suck in the tissue to be ligated;

[0026] Three groups of equidistantly distributed elastic telescopic rods 6 are passed through the outer walls of the upper and lower sides of the ligature outer tube 1, and the three groups of elastic telescopic rods 6 grow in sequence from left to right. The elastic telescopic rod 6 is located on one end of the outer tube 1 outside the ligature outer tube and fixed with a limiting block 7. The outer wall of the ligature outer tube 1 is provided with a receiving groove 32 adapted to the limiting block 7. A rubber ring 8 is sleeved on the outside of the ligature outer tube 1. The rubber ring 8 is provided with three groups and corresponds to each limiting block 7 one by one. The limiting block 7 limits the rubber ring 8 to prevent the rubber ring 8 from The ligature outer tube 1 falls off, and the inner walls of the upper and lower sides of the ligature outer tube 1 are fixed with limit springs 9. The end of the limit spring 9 away from the inner wall of the ligature outer tube 1 is connected with a pull plate 10, and the pull plate 10 is driven and displaced by a pneumatic traction mechanism. The pneumatic traction mechanism is driven by an external negative pressure device. The end of the elastic telescopic rod 6 located inside the ligature outer tube 1 is fixedly connected to the pull plate 10. By pulling the pull plate 10, each elastic telescopic rod 6 is driven to retract until the limit block 7 on the rubber ring 8 is released;

[0027] Specifically, the control is divided into three times. The first time, the two groups of pull plates 10 are controlled to move toward each other by an appropriate distance, so that the elastic telescopic rod 6 on the far left is completely retracted. The other two groups of elastic telescopic rods 6 are longer and can continue to limit the remaining rubber rings 8 while ensuring retraction to a certain distance. The second time, the two groups of pull plates 10 are controlled to continue to move toward each other by an appropriate distance, so that the elastic telescopic rod 6 in the middle position is completely retracted. The elastic telescopic rod 6 on the far right is longer and can continue to limit the remaining rubber rings 8 while ensuring retraction to a certain distance (at this time, since the elastic telescopic rod 6 has a certain elastic telescopic ability, the elastic telescopic rod 6 on the far left can also continue to stretch to avoid affecting the movement of the pull plate 10). The third time, the two groups of pull plates 10 are controlled to continue to move toward each other by an appropriate distance, so that the elastic telescopic rod 6 on the far right is completely retracted, and the limit of the last group of rubber rings 8 is released.

[0028] The screw locking mechanism comprises a connecting ring 11 and an external thread 12, wherein the connecting ring 11 is slidably sleeved on the outer side of the endoscope connecting seat 3 and can slide left and right. The external thread 12 is opened on the outer wall of the hard tube 4 at the end of the endoscope, and the inner wall on the right side of the connecting ring 11 is provided with an internal thread adapted to the external thread 12, so that the connecting ring 11 can be screwed on the hard tube 4 at the endoscope. A limiting convex ring 13 is fixed on the outer wall of the endoscope connecting seat 3, and a limiting groove 14 is provided in the middle position of the inner wall of the connecting ring 11, and the limiting groove 14 is adapted to the limiting convex ring 13 to limit the connecting ring 11. First, the endoscope connecting seat 3 is connected to the hard tube 4 at the endoscope, and then the connecting ring 11 is screwed on the hard tube 4 at the endoscope. Continue to rotate the connecting ring 11 to the right, and under the limiting blockage of the limiting convex ring 13, the endoscope connecting seat 3 and the hard tube 4 at the endoscope are driven to fit tightly, that is, the installation and fixation of the endoscope connecting seat 3 and the hard tube 4 at the endoscope is achieved.

[0029] A docking guide ring 15 that is compatible with the endoscope terminal rigid tube 4 is fixed to the right inner wall of the endoscope connecting seat 3, and the right end of the docking guide ring 15 is designed with an arc chamfer, so that the endoscope connecting seat 3 and the endoscope terminal rigid tube 4 can be docked more accurately. The endoscope connecting seat 3 and the endoscope terminal rigid tube 4 are provided with a first sealing groove 16 on the opposite side, and a first sealing ring 17 is embedded between the two groups of first sealing grooves 16, which plays a sealing role when the endoscope connecting seat 3 and the endoscope terminal rigid tube 4 are docked and fixed.

[0030] A threaded connection groove 18 is provided on the right side of the ligation inner tube 2, and a docking ring 19 is fixed to the left end of the negative pressure suction pipe 5. A threaded connection pipe 20 is fixed to the left end of the docking ring 19. The threaded connection pipe 20 is connected to the negative pressure suction pipe 5 and is adapted to the threaded connection groove 18. By screwing the threaded connection pipe 20 into the threaded connection groove 18, the docking ring 19 and the ligation inner tube 2 are docked and fixed, that is, the fixed installation of the negative pressure suction pipe 5 is completed. A second sealing ring 21 is fixed to the left end of the docking ring 19, and a second sealing groove 22 is provided on the right side of the ligation inner tube 2, and the second sealing groove 22 is adapted to the second sealing ring 21. When the docking ring 19 and the ligation inner tube 2 are docked, the second sealing ring 21 plays a sealing role.

[0031] The elastic telescopic rod 6 includes a sleeve 23 and a slide rod 24, wherein the sleeve 23 slides through the side wall of the sleeve outer tube 1, and the side wall of the sleeve outer tube 1 is provided with a through groove adapted to the sleeve 23, and the slide rod 24 is fixedly connected to the pull plate 10. The end of the slide rod 24 away from the pull plate 10 slides through the inside of the sleeve 23, and a baffle 25 is fixed on the end of the slide rod 24 located inside the sleeve 23. A linear spring 26 is also movably provided on one side of the slide rod 24 located inside the sleeve 23, and the linear spring 26 is fixed between the baffle 25 and the inner wall of the sleeve 23. The linear spring 26 provides an elastic ejection force, so that the slide rod 24 can be stretched to a certain extent and rebound to reset.

[0032] The pneumatic traction mechanism includes a pneumatic cavity 27 and a pneumatic diaphragm 28, wherein the pneumatic cavity 27 is provided with two groups and is symmetrically fixed to the upper and lower inner walls of the ligature outer tube 1, the pneumatic diaphragm 28 is fixed to the left side of the inside of the pneumatic cavity 27, and a steel wire rope 29 is fixed to the outer wall of the pneumatic diaphragm 28 close to the pull plate 10, and a pulley 31 adapted to the steel wire rope 29 is symmetrically fixed inside the ligature outer tube 1, and the end of the steel wire rope 29 away from the pneumatic diaphragm 28 passes through the pulley 31 and is fixedly connected to the pull plate 10, and a negative pressure air tube 30 is fixed to the right side wall of the pneumatic cavity 27, the left end of the negative pressure air tube 30 passes through the pneumatic cavity 27, and the right end of the negative pressure air tube 30 passes through the endoscope connecting seat 3 and the endoscope end hard tube 4, extends to the handle of the endoscope equipment and is connected to the external negative pressure equipment.

[0033] When the endoscopic esophageal varicose vein ligation device is actually used, the endoscope end rigid tube 4 is fixed to the end of the insertion part of the endoscope device. The endoscope connecting seat 3 of the device is first fixedly installed with the endoscope end rigid tube 4 of the endoscope device through the spiral locking mechanism, and the negative pressure suction tube 5 and the negative pressure trachea 30 are passed through the channel of the endoscope device to the handle end of the endoscope device, and the negative pressure suction tube 5 and the negative pressure trachea 30 are respectively connected to different negative pressure devices in the outside. In the initial state, the pull plate 10 drives the elastic telescopic rod 6 to extend to the outside of the ligation outer tube 1 under the action of the limit spring 9, and the length of each elastic telescopic rod 6 increases from left to right. The negative pressure device connected to the negative pressure suction tube 5 is first driven to suck the tissue to be ligated into the negative pressure cavity in the ligation inner tube 2, and then the negative pressure device connected to the negative pressure trachea 30 is driven to suck air into the pneumatic cavity 27, so that the pneumatic diaphragm 28 retracts to the right and the pull plate 10 is pulled by the wire rope 29 until it reaches the end. The left elastic telescopic rod 6 drives the limit block 7 to retract into the accommodating groove 32 (at this time, since the two groups of elastic telescopic rods 6 on the right are longer and have not been fully retracted, they still play a limiting role on the two groups of rubber rings 8 on the right). Then the rubber ring 8 on the far left will slide through the wall of the ligature outer tube 1 and cover the tissue to be ligated. When another tissue needs to be ligated, air is continued to be sucked into the pneumatic cavity 27 to make the pneumatic diaphragm 28 continue to retract to the right until the elastic telescopic rod 6 in the middle position drives the limit block 7 to retract into the accommodating groove 32. Then the rubber ring 8 in the middle position will slide through the wall of the ligature outer tube 1 and cover the tissue to be ligated. The above steps are repeated until all the rubber rings 8 on the outer wall of the ligature outer tube 1 are used up, realizing continuous ligation. When the ligation is completed and the connection between the device and the endoscopic equipment needs to be released, the spiral locking mechanism is released to fix the endoscope connecting seat 3 and the endoscope end hard tube 4, and the disassembly work can be completed.

[0034] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An endoscopic esophageal varicose vein ligation device, comprising a ligation outer tube (1), characterized in that: The inner side of the ligature outer tube (1) is sealedly connected to the ligature inner tube (2); an endoscope connecting seat (3) is fixed to the end of the ligature outer tube (1) away from the connection with the ligature inner tube (2); the end of the endoscope connecting seat (3) away from the ligature inner tube (2) is sealedly connected to the endoscope hard tube (4) through a spiral locking mechanism; the end of the ligature inner tube (2) close to the endoscope hard tube (4) is sealedly connected to a negative pressure suction pipe (5); the end of the negative pressure suction pipe (5) away from the ligature inner tube (2) passes through the endoscope connecting seat (3) and the endoscope hard tube (4). ), elastic telescopic rods (6) are equidistantly passed through the outer walls of the upper and lower sides of the tying outer tube (1), a limit block (7) is fixed at one end of the elastic telescopic rod (6) located outside the tying outer tube (1), and a rubber ring (8) adapted to the position of the limit block (7) is equidistantly sleeved on the outside of the tying outer tube (1), and the inner walls of the upper and lower sides of the tying outer tube (1) are connected to a pull plate (10) driven to move by a pneumatic traction mechanism through a limit spring (9), and the end of the elastic telescopic rod (6) located inside the tying outer tube (1) is fixedly connected to the pull plate (10).

2. The endoscopic esophageal varicose vein ligation device according to claim 1, characterized in that: The spiral locking mechanism comprises a connecting ring (11) slidably sleeved on the outside of the endoscope connecting seat (3) and an external thread (12) provided on the outer wall of the endoscope end hard tube (4); an internal thread adapted to the external thread (12) is provided on the inner wall of the connecting ring (11) close to the endoscope end hard tube (4); a limiting convex ring (13) is fixed on the outer wall of the endoscope connecting seat (3); and a limiting groove (14) adapted to the limiting convex ring (13) is provided in the middle position of the inner wall of the connecting ring (11).

3. The endoscopic esophageal varicose vein ligation device according to claim 1, characterized in that: A docking guide ring (15) is fixed to the inner wall of the endoscope connecting seat (3) on the side close to the endoscope end hard tube (4), and first sealing grooves (16) are provided on opposite sides of the endoscope connecting seat (3) and the endoscope end hard tube (4), and a first sealing ring (17) is embedded between two groups of the first sealing grooves (16).

4. The endoscopic esophageal varicose vein ligation device according to claim 1, characterized in that: A threaded connection groove (18) is provided on one side of the ligature inner tube (2) close to the hard tube (4) at the end of the endoscope, a docking ring (19) is fixed to one end of the negative pressure suction tube (5) close to the ligature inner tube (2), and a threaded connection tube (20) is fixed to one end of the docking ring (19) close to the ligature inner tube (2) and is connected to the negative pressure suction tube (5) and adapted to the threaded connection groove (18).

5. The endoscopic esophageal varicose vein ligation device according to claim 4, characterized in that: A second sealing ring (21) is fixed to one end of the docking ring (19) close to the ligated inner tube (2), and a second sealing groove (22) adapted to the second sealing ring (21) is provided on one side of the ligated inner tube (2) close to the docking ring (19).

6. The endoscopic esophageal varicose vein ligation device according to claim 1, characterized in that: The elastic telescopic rod (6) comprises a sleeve (23) that slides through the side wall of the sleeve outer tube (1) and a slide rod (24) fixedly connected to the pull plate (10). The end of the slide rod (24) away from the pull plate (10) slides through the interior of the sleeve (23) and is fixed with a blocking piece (25). A linear spring (26) that is sleeved on the outside of the slide rod (24) is fixed between the blocking piece (25) and the inner wall of the sleeve (23).

7. The endoscopic esophageal varicose vein ligation device according to claim 1, characterized in that: The pneumatic traction mechanism comprises a pneumatic cavity (27) fixed to the inner wall of the ligature outer tube (1) and a pneumatic diaphragm (28) fixed to the inner wall of the pneumatic cavity (27); a steel wire rope (29) is fixed between the outer wall of the pneumatic diaphragm (28) on one side close to the pull plate (10) and the pull plate (10); a negative pressure air tube (30) is fixed to the side wall of the pneumatic cavity (27) away from the pneumatic diaphragm (28); and one end of the negative pressure air tube (30) away from the pneumatic diaphragm (28) passes through the endoscope connecting seat (3) and the endoscope hard tube (4).

8. The endoscopic esophageal varicose vein ligation device according to claim 7, characterized in that: A pulley (31) adapted to the steel wire rope (29) is symmetrically fixed inside the tying outer tube (1), and one end of the steel wire rope (29) away from the pneumatic diaphragm (28) passes through the pulley (31) and is fixedly connected to the pull plate (10). A receiving groove (32) adapted to the limit block (7) is opened on the outer wall of the tying outer tube (1), and the lengths of the elastic telescopic rods (6) distributed at equal distances increase from left to right.

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