The tying and cutting structure of the ligation device and the automatic tying and cutting structure

Abstract

The present invention provides a tying and cutting structure of a ligature device and an automatic ligature cutting structure, comprising: a housing; a ring driving component that can move along the front-to-back direction of the housing; a ring driving rack provided on the ring driving component; a push block provided on the front end of the suction pipe, and the push block is connected to the ring driving component; the rear end position of the tension spring is fixed; the rear end of the driving pull rod is connected to the front end of the tension spring, and the rear end of the driving pull rod is also provided with a pull rod rack; the gear is movably arranged inside the housing; the tying pull rod can move along the front-to-back direction of the housing; an elastic ligature line, the front end of the ligature line is tied with a slipknot to form a ring set, and the ring set is sleeved on the front end of the suction pipe; a driving hook is provided at the front end of the driving pull rod, and a tying hook is provided at the rear end of the tying pull rod; a trigger is movably installed inside the housing. The present invention completes the operation of tying and cutting the ligature line by starting the tying driving component, and avoids sharp instruments from contacting the human body, making the operation safe.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a ligation and cutting structure of a ligation device and an automatic ligation and cutting structure. Background Art

[0002] Automatic hemorrhoid ligation is one of the most effective non-surgical treatments for hemorrhoids. This method uses a special automatic hemorrhoid ligation device to place a special rubber ring or elastic coil on the base of the hemorrhoid or the mucosa on the hemorrhoid at an appropriate position 1.5 to 3 cm above the tooth line. It blocks the blood supply of the hemorrhoid or reduces venous reflux through tightening and strangulation, reduces congestion and hypertrophy of the hemorrhoid or blood stasis, and causes ischemia, atrophy, and necrosis. The ligated tissue gradually falls off, and the wound tissue is repaired and healed. The ligation process saves time and effort, and can be completed by one person alone. No anesthesia is required, and the patient can leave as soon as the treatment is completed. It is mildly painful, and complications are rare. No scars are left after the operation, and the normal structure and appearance of the rectum and anal canal are not damaged, which can greatly facilitate subsequent treatment. The current ligation stapler mainly relies on manual operation to tighten the ligature and cut the ligature. How to design a ligature stapler that can combine the operations of tightening the ligature and cutting the ligature in the ligature surgery and control it through a single switch, so as to achieve one-step operation, ensure the safety of the surgery, and improve the efficiency of the surgery is a problem that technical personnel in this field need to solve. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a ligation and cutting structure of a ligation device and an automatic ligation and cutting structure of a ligation device, so as to solve the above-mentioned problems existing in the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides an automatic ligation and cutting structure of a ligation device, comprising:

[0005] case;

[0006] An air intake pipe is arranged inside the shell, and a front end of the air intake pipe passes through the shell;

[0007] A tightening rod is disposed inside the housing and can move along the front-rear direction of the housing;

[0008] A tightening driving component, used for driving the tightening pull rod to move backward;

[0009] An elastic ligature wire, the front end of which is tied with a slipknot to form a loop sleeve, and the loop sleeve is sleeved on the front end of the suction pipe; the rear end of the ligature wire is connected to the front end of the tightening rod;

[0010] An anvil is disposed inside the housing and in front of the tightening rod;

[0011] The cutting knife is arranged inside the shell, and the cutting knife includes a knife rod and a blade head. The knife rod can move along the front and rear direction of the shell, and the tying line passes through between the anvil and the knife rod; the blade head is arranged at the front end of the knife rod, the blade head is in front of the anvil, the blade head is bent and the end of the blade head faces the anvil; the rear end of the knife rod is provided with a blocking piece, and the blocking piece is on the path of the tightening pull rod moving backward.

[0012] Preferably, the tightening driving component comprises:

[0013] A tension spring is arranged inside the housing, and a rear end position of the tension spring is fixed;

[0014] A driving rod is disposed inside the housing and can move along the front-rear direction of the housing, the rear end of the driving rod is connected to the front end of the tension spring, and the front end of the tightening rod is located in front of the front end of the driving rod;

[0015] The front end of the driving pull rod is provided with a driving hook, and the rear end of the tightening pull rod is provided with a tightening hook, and the tightening hook is arranged opposite to the driving hook;

[0016] a trigger, movably mounted inside the housing;

[0017] When the tying and cutting structure of the ligation device is in an initial state, the trigger abuts against the rear end of the driving rod, and the tension spring is stretched.

[0018] Preferably, the tying and cutting structure of the ligating device further comprises a support shaft arranged inside the shell; the support shaft is located between the anvil and the blade head, and the ligating wire passes around the support shaft and then penetrates between the anvil and the knife rod.

[0019] Preferably, the knife bar is located between the suction pipe and the tightening rod.

[0020] Preferably, the knife bar is arranged in parallel with the tightening rod.

[0021] When the tightening and cutting structure of the ligation device of the present invention is used, after the ring sleeve is used to sleeve the hemorrhoids, the tightening driving component drives the tightening pull rod to move backward, and the tightening pull rod tightens the ring sleeve sleeve sleeved on the hemorrhoids; then, the tightening pull rod continues to move backward, and after the tightening pull rod contacts the blocking piece, since the blocking piece is on the path of the tightening pull rod moving backward, the tightening pull rod pushes the blocking piece to move backward, so that the blade head moves backward, and the blade head pushes the ligation line to the anvil, thereby cutting the ligation line. The present invention can complete the operations of tightening and cutting the ligation line by starting the tightening driving component, thereby improving the efficiency of the operation. Since the cutting knife is arranged inside the shell, the tightening and cutting structure of the ligation device of the present invention can also prevent sharp instruments from contacting the human body to ensure the safety of the operation.

[0022] The present invention also relates to an automatic ligation and cutting structure of a ligation device, comprising a loop driving component and the ligation and cutting structure of the ligation device;

[0023] The front end of the air intake pipe is sleeved with a push block, and the push block is located behind the ring sleeve;

[0024] The ring driving component is arranged inside the shell and can move along the front-rear direction of the shell; a ring driving rack is arranged on the outer side surface of the ring driving component;

[0025] A pull rod rack is also provided on the rear end of the driving pull rod;

[0026] A gear, movably arranged inside the housing and between the pull rod rack and the ring sleeve driving rack;

[0027] When the automatic ligation and cutting structure is in an initial state, the gear meshes with the teeth of the pull rod rack, the gear meshes with the teeth of the ring sleeve driving rack, the pull rod rack is in front of the ring sleeve driving rack, and there is an initial gap between the tightening hook and the driving hook.

[0028] Preferably, the ring sleeve driving component comprises: a driving positioning spring, a driving slider, a driven slider and a driven positioning spring;

[0029] The rear end of the driving positioning spring is fixed;

[0030] The driving slider can move along the front-rear direction of the housing; the rear end of the driving slider is connected to the front end of the driving positioning spring, and the ring driving rack is arranged on the outer side of the driving slider;

[0031] The driven slider can move along the front-rear direction of the housing, and the rear end of the driven slider contacts the front end of the driving slider;

[0032] The driven positioning spring is sleeved on the rear end of the driven slider and connected to the rear end of the driven slider, and the driven positioning spring is located between the air intake pipe and the driving slider.

[0033] Furthermore, the automatic ligation and cutting structure of the ligation device also includes: a trachea joint arranged inside the shell, and the trachea joint is arranged behind the suction pipe; the driving positioning spring and the driving slider are sleeved on the trachea joint, the rear end of the suction pipe is connected to the trachea joint, and the driven slider is arranged on the suction pipe.

[0034] Furthermore, the central axis of the driving positioning spring is colinear with the central axis of the driven positioning spring.

[0035] Furthermore, the central axis of the tension spring is parallel to the central axis of the driving slider.

[0036] When the automatic ligation and cutting structure of the ligation device of the present invention is used, the medical staff rotates the trigger so that the trigger no longer presses against the rear end of the driving rod, and the restoring force of the tension spring drives the driving rod to move backward, and the rod rack on the driving rod pushes the ring driving rack on the ring driving component through the gear, so that the ring driving component moves forward, and the ring driving component drives the push block to move forward, and the push block pushes the ring set to remove the hemorrhoids; after the ring set removes the hemorrhoids, the restoring force of the tension spring will continue to drive the driving rod to move forward When the hemorrhoids are moved backward, the driving hook of the driving rod will pull the tightening hook of the tightening rod, and the tightening rod moves backward with the driving rod, and the tightening rod will be sleeved on the hemorrhoids to tighten the ring set; after the ring set tightens the hemorrhoids, the driving rod drives the tightening rod to continue to move backward, and after the tightening rod contacts the blocking piece, since the blocking piece is on the path of the tightening rod moving backward, the tightening rod pushes the blocking piece to move backward, so that the blade head moves backward, and the blade head pushes the ligation line to the anvil to cut off the ligation line. The present invention can control the three steps of sleeve hemorrhoids, tightening hemorrhoids with the ring set, and cutting the ligation line through a trigger, which can be done in one step, making the operation process faster; at the same time, the present invention is easy to operate with one hand, which is convenient for doctors and simplifies hemorrhoid surgery; the present invention allows doctors to perform surgery calmly, reduce operation time and reduce complications; the automatic ligation and cutting structure of the ligation device of the present invention is simple, easy to use, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic structural diagram showing that the automatic ligation and cutting structure of the ligation device of this embodiment is in an initial state and no shell is provided.

[0038] Figure 2 It is a schematic structural diagram of the automatic ligation and cutting structure of the ligation device of this embodiment when the first stage of firing is completed and the housing is not provided.

[0039] Figure 3 It is a schematic structural diagram of the automatic ligation and cutting structure of the ligation device of this embodiment when the second stage of firing is completed and the shell is not provided.

[0040] Figure 4 It is a schematic structural diagram showing the situation in which the cutting knife in the automatic ligation cutting structure of the ligation device of this embodiment cuts off the ligation wire.

[0041] Figure 5 It is a schematic diagram of the internal structure of the automatic ligation and cutting structure of the ligation device of this embodiment without the driving positioning spring, the driven positioning spring and the ligation wire.

[0042] Description of Figure Numbers

[0043] 100 Shell

[0044] 110 Trigger

[0045] 120 Shaft

[0046] 200 Ring drive parts

[0047] 210 Ring drive rack

[0048] 220 Drive positioning spring

[0049] 230 Drive Slider

[0050] 240 Follower Slider

[0051] 250 Follower positioning spring

[0052] 300 Suction pipe

[0053] 310 Push Block

[0054] 400 Extension Spring

[0055] 500 Drive rod

[0056] 510 tie rod rack

[0057] 520 Drive hook

[0058] 600 Gear

[0059] 700 Tighten the tie rod

[0060] 710 Tighten the hook

[0061] 800 Tie wire

[0062] 810 Ring Kit

[0063] 900 Air pipe connector

[0064] 20. Cutting Board

[0065] 30 Cutting knife

[0066] 31 Tool bar

[0067] 32 blade head

[0068] 33 Blocking sheet

[0069] 40 Support shaft DETAILED DESCRIPTION

[0070] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0071] Please refer to the attached drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the attached drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0072] like Figures 1 to 5 As shown, the automatic ligation and cutting structure of the ligation device of this embodiment includes:

[0073] Housing 100;

[0074] The air intake pipe 300 is disposed inside the housing 100, and the front end of the air intake pipe 300 passes through the housing 100;

[0075] The tightening rod 700 is disposed inside the housing 100 and can move along the front-rear direction of the housing 100;

[0076] A tightening driving component, used for driving the tightening rod 700 to move backward;

[0077] The ligature wire 800 has an elasticity, and the front end of the ligature wire 800 is tied with a slipknot to form a loop set 810, and the loop set 810 is sleeved on the front end of the suction pipe 300; the rear end of the ligature wire 800 is connected to the front end of the tightening rod 700;

[0078] The cutting board 20 is disposed inside the housing 100 and in front of the tightening rod 700;

[0079] The cutting knife 30 is arranged inside the shell 100, and the cutting knife 30 includes a knife rod 31 and a blade head 32. The knife rod 31 can move along the front and rear directions of the shell 100, and the tying line 800 passes between the anvil 20 and the knife rod 31; the blade head 32 is arranged at the front end of the knife rod 31, the blade head 32 is in front of the anvil 20, the blade head 32 is bent and the end of the blade head 32 faces the anvil 20; the rear end of the knife rod 31 is provided with a blocking piece 33, and the blocking piece 33 is on the path of the tightening pull rod 700 moving backward.

[0080] When the tightening and cutting structure of the ligation device of the present invention is used, after the ring sleeve 810 is sleeved with the hemorrhoids, the tightening driving component drives the tightening pull rod 700 to move backward, and the tightening pull rod 700 tightens the ring sleeve 810 sleeved on the hemorrhoids; then, the tightening pull rod 700 continues to move backward, and after the tightening pull rod 700 contacts the blocking sheet 33, since the blocking sheet 33 is on the path of the tightening pull rod 700 moving backward, the tightening pull rod 700 pushes the blocking sheet 33 to move backward, so that the blade head 32 moves backward, and the blade head 32 pushes the ligation line 800 to the anvil 20, so as to cut off the ligation line 800. The present invention can complete the operation of tightening the ligation line 800 and cutting the ligation line 800 by starting the tightening driving component, thereby improving the surgical efficiency. Since the cutting knife 30 is arranged inside the housing 100, the tightening and cutting structure of the ligation device of the present invention can also prevent sharp instruments from contacting the human body to ensure surgical safety.

[0081] The tightening drive components include:

[0082] The tension spring 400 is disposed inside the housing 100, and the rear end of the tension spring 400 is fixed;

[0083] The driving rod 500 is disposed inside the housing 100 and can move along the front-rear direction of the housing 100. The rear end of the driving rod 500 is connected to the front end of the tension spring 400. The front end of the tightening rod 700 is located in front of the front end of the driving rod 500.

[0084] A driving hook 520 is provided at the front end of the driving rod 500, and a tightening hook 710 is provided at the rear end of the tightening rod 700. The tightening hook 710 is arranged opposite to the driving hook 520.

[0085] A trigger 110 is movably mounted inside the housing 100;

[0086] When the tying and cutting structure of the ligature is in the initial state, the trigger 110 abuts against the rear end of the driving rod 500, and the tension spring 400 is stretched.

[0087] The medical staff turns the trigger 110 so that the trigger 110 no longer presses against the rear end of the driving rod 500, and the restoring force of the tension spring 400 drives the driving rod 500 to move backward. After the driving hook 520 of the driving rod 500 contacts the tightening hook 710 of the tightening rod 700, the driving rod 500 drives the tightening rod 700 to move backward. The structure is simple and easy to control.

[0088] The tying and cutting structure of the ligating device further includes a support shaft 40 disposed inside the housing 100; the support shaft 40 is disposed between the anvil 20 and the blade head 32, and the ligating wire 800 passes around the support shaft 40 and then passes between the anvil 20 and the knife bar 31. The arrangement of the support shaft 40 enables the ligating wire 800 to be in a tensioned state, which facilitates the blade head 32 to cut the ligating wire 800.

[0089] The automatic ligation and cutting structure of the ligation device of this embodiment includes a loop driving component 200 and a ligation and cutting structure of the ligation device;

[0090] A push block 310 is sleeved at the front end of the air intake pipe 300, and the push block 310 is located behind the ring sleeve 810;

[0091] The ring driving component 200 is disposed inside the housing 100 and can move along the front-rear direction of the housing 100; a ring driving rack 210 is disposed on the outer surface of the ring driving component 200;

[0092] A pull rod rack 510 is also provided on the rear end of the driving pull rod 500;

[0093] The gear 600 is movably disposed inside the housing 100 and is located between the pull rod rack 510 and the ring sleeve driving rack 210;

[0094] When the automatic ligation and cutting structure is in the initial state, the gear 600 meshes with the teeth of the pull rod rack 510, and the gear 600 meshes with the teeth of the ring sleeve driving rack 210. The pull rod rack 510 is in front of the ring sleeve driving rack 210, and there is an initial gap between the tightening hook 710 and the driving hook 520.

[0095] When the automatic ligation and cutting structure of the ligation device of the present invention is used, the medical staff rotates the trigger 110 so that the trigger 110 no longer presses against the rear end of the driving rod 500, and the restoring force of the tension spring 400 drives the driving rod 500 to move backward, and the rod rack 510 on the driving rod 500 pushes the ring driving rack 210 on the ring driving component 200 through the gear 600, and the ring driving component 200 moves forward, and the ring driving component 200 drives the pushing block 310 to move forward, and the pushing block 310 pushes the ring set 810 out to remove the hemorrhoids, and the automatic ligation and cutting structure has completed the first stage of firing; because there is an initial interval between the tightening hook 710 and the driving hook 520, when the first stage of firing of the automatic ligation and cutting structure is completed, the tightening hook 710 and the driving hook 520 are not in contact;

[0096] After the first stage of firing of the automatic ligation and cutting structure is completed, the restoring force of the tension spring 400 will continue to drive the driving rod 500 to move backward, and the driving hook 520 of the driving rod 500 will pull the tightening hook 710 of the tightening rod 700. The tightening rod 700 moves backward with the driving rod 500, and the tightening rod 700 will tighten the ring kit 810 on the hemorrhoids. At this point, the automatic ligation and cutting structure has completed the second stage of firing; when the second stage of firing of the automatic ligation and cutting structure is completed, the ring driving rack 210 is disengaged from the gear 600.

[0097] After the ring kit 810 tightens the hemorrhoids, the driving rod 500 drives the tightening rod 700 to continue to move backward. After the tightening rod 700 contacts the blocking piece 33, since the blocking piece 33 is on the backward moving path of the tightening rod 700, the tightening rod 700 pushes the blocking piece 33 to move backward, which causes the blade head 32 to move backward. The blade head 32 pushes the ligation line 800 to the anvil 20, thereby cutting off the ligation line 800.

[0098] The present invention can control the three steps of collecting hemorrhoids, tying the hemorrhoids with the ring set 810 and cutting the ligature 800 through a trigger 110, which can be completed in one step, making the operation process faster; at the same time, the present invention is easy to operate with one hand, which is convenient for doctors and simplifies hemorrhoid surgery;

[0099] The ring driving component 200 includes: a driving positioning spring 220, a driving slider 230, a driven slider 240 and a driven positioning spring 250;

[0100] The rear end of the driving positioning spring 220 is fixed;

[0101] The driving slider 230 can move along the front-to-back direction of the housing 100; the rear end of the driving slider 230 is connected to the front end of the driving positioning spring 220, and the ring driving rack 210 is disposed on the outer surface of the driving slider 230;

[0102] The driven slider 240 can move along the front-rear direction of the housing 100, and the rear end of the driven slider 240 contacts the front end of the driving slider 230;

[0103] The driven positioning spring 250 is sleeved on the rear end of the driven slider 240 and connected to the rear end of the driven slider 240 . The driven positioning spring 250 is located between the air intake pipe 300 and the driving slider 230 .

[0104] The rod rack 510 on the driving rod 500 pushes the ring-shaped driving rack 210 on the outer side of the driving slider 230 through the gear 600, and the driving positioning spring 220 is stretched, the driving slider 230 moves forward, the driving slider 230 pushes the driven slider 240 to move forward, and the driving slider 230 pushes the driven positioning spring 250 to compress, the driven slider 240 drives the push block 310 to move forward, and the push block 310 pushes out the ring set 810. After the rod rack 510 is disengaged from the gear 600, the restoring force of the driving positioning spring 220 drives the driving slider 230 to move backward and reset, and the restoring force of the driven positioning spring 250 drives the driven slider 240 to move backward and reset.

[0105] The automatic ligation and cutting structure of the ligation device also includes: a tracheal joint 900 disposed inside the housing 100, the tracheal joint 900 is disposed behind the air intake pipe 300; a driving positioning spring 220 and a driving slider 230 are sleeved on the tracheal joint 900, the rear end of the air intake pipe 300 is connected to the tracheal joint 900, and a driven slider 240 is disposed on the air intake pipe 300. This structure facilitates the installation of the driving positioning spring 220 and the driving slider 230, and is conducive to stably driving the slider 230 to push the driven slider 240 to move.

[0106] The knife bar 31 is located between the air suction pipe 300 and the tightening rod 700. This structure ensures that the driving rod 500 drives the tightening rod 700 to move backward and will not be disturbed by the knife bar 31 before it hits the blocking sheet 33.

[0107] In order to make the internal structure of the automatic ligation and cutting structure more compact, the central axis of the driving positioning spring 220 is colinear with the central axis of the driven positioning spring 250. The trigger 110 is located below the driving rod 500, the driving rod 500 is located below the tightening rod 700, and the tightening rod 700 is located below the suction pipe 300. The knife bar 31 is arranged parallel to the tightening rod 700. The trigger 110 is movably connected to the housing 100 through the rotating shaft 120.

[0108] The central axis of the tension spring 400 is parallel to the central axis of the driving slider 230. The central axis of the tension spring 400 is parallel to the length direction of the driving rod 500, and the length direction of the driving rod 500 is the front-back direction of the driving rod 500. This structure enables the restoring force of the tension spring 400 to stably drive the driving rod 500 to move, and the driving rod 500 can stably drive the driving slider 230 to move.

[0109] The present invention allows doctors to perform surgery calmly, reduces operation time and reduces complications; the automatic ligation and cutting structure of the ligation device of the present invention is simple, easy to use, safe and reliable.

[0110] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0111] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A tying and cutting structure of a ligation device, characterized in that: include: Housing (100); An air intake pipe (300) is arranged inside the shell (100), and a front end of the air intake pipe (300) passes through the shell (100); A tightening rod (700) is disposed inside the housing (100) and is movable along the front-rear direction of the housing (100); A tightening driving component, used for driving the tightening pull rod (700) to move backward; An elastic ligature (800) is provided, the front end of the ligature (800) is tied with a slipknot to form a ring set (810), and the ring set (810) is sleeved on the front end of the suction pipe (300); the rear end of the ligature (800) is connected to the front end of the tightening rod (700); An anvil (20) is arranged inside the housing (100) and in front of the tightening rod (700); A cutting knife (30) is arranged inside the shell (100), and the cutting knife (30) comprises a knife rod (31) and a blade head (32). The knife rod (31) can move along the front-rear direction of the shell (100), and the tying wire (800) passes between the anvil (20) and the knife rod (31); the blade head (32) is arranged at the front end of the knife rod (31), the blade head (32) is located in front of the anvil (20), the blade head (32) is bent and the end of the blade head (32) faces the anvil (20); a blocking piece (33) is provided at the rear end of the knife rod (31), and the blocking piece (33) is located on the path of the tightening pull rod (700) moving backward.

2. The tying and cutting structure of the ligation device according to claim 1, characterized in that: The tightening driving component comprises: A tension spring (400) is arranged inside the housing (100), and the rear end position of the tension spring (400) is fixed; A driving rod (500) is arranged inside the housing (100) and can move along the front-rear direction of the housing (100), the rear end of the driving rod (500) is connected to the front end of the tension spring (400), and the front end of the tightening rod (700) is located in front of the front end of the driving rod (500); The front end of the driving pull rod (500) is provided with a driving hook (520), and the rear end of the tightening pull rod (700) is provided with a tightening hook (710), and the tightening hook (710) is arranged opposite to the driving hook (520); A trigger (110) movably mounted inside the housing (100); When the tying and cutting structure of the ligature is in an initial state, the trigger (110) abuts against the rear end of the driving rod (500), and the tension spring (400) is stretched.

3. The tying and cutting structure of the ligation device according to claim 1 or 2, characterized in that: It also includes a support shaft (40) arranged inside the shell (100); the support shaft is located between the anvil (20) and the blade head (32); the ligature wire (800) passes around the support shaft (40) and then penetrates between the anvil (20) and the knife rod (31).

4. The tying and cutting structure of the ligation device according to claim 1 or 2, characterized in that: The knife rod (31) is located between the air suction pipe (300) and the tightening rod (700).

5. The tying and cutting structure of the ligation device according to claim 1 or 2, characterized in that: The knife rod (31) is arranged in parallel with the tightening rod (700).

6. An automatic ligation and cutting structure of a ligation device, characterized in that: It comprises a loop driving component (200) and the tying and cutting structure of the ligation device as claimed in claim 2; The front end of the air intake pipe (300) is sleeved with a push block (310), and the push block (310) is located behind the ring sleeve (810); The ring sleeve driving component (200) is arranged inside the housing (100) and can move along the front-rear direction of the housing (100); a ring sleeve driving rack (210) is arranged on the outer surface of the ring sleeve driving component (200); A pull rod rack (510) is also provided on the rear end of the driving pull rod (500); A gear (600) movably arranged inside the housing (100) and located between the pull rod rack (510) and the ring sleeve driving rack (210); When the automatic ligation and cutting structure is in an initial state, the gear (600) is meshed with the teeth of the pull rod rack (510), the gear (600) is meshed with the teeth of the ring sleeve driving rack (210), the pull rod rack (510) is in front of the ring sleeve driving rack (210), and there is an initial gap between the tightening hook (710) and the driving hook (520).

7. The automatic ligation and cutting structure of the ligation device according to claim 6, characterized in that: The ring sleeve driving component (200) comprises: a driving positioning spring (220), a driving slider (230), a driven slider (240) and a driven positioning spring (250); The rear end of the driving positioning spring (220) is fixed; The driving slider (230) can move along the front-rear direction of the housing (100); the rear end of the driving slider (230) is connected to the front end of the driving positioning spring (220), and the ring-shaped driving rack (210) is arranged on the outer side surface of the driving slider (230); The driven slider (240) can move along the front-rear direction of the housing (100), and the rear end of the driven slider (240) contacts the front end of the driving slider (230); The driven positioning spring (250) is sleeved on the rear end of the driven slider (240) and connected to the rear end of the driven slider (240); the driven positioning spring (250) is located between the air intake pipe (300) and the driving slider (230).

8. The automatic ligation and cutting structure of the ligation device according to claim 7, characterized in that: Also includes: An air pipe joint (900) is arranged inside the shell (100), and the air pipe joint (900) is arranged behind the air intake pipe (300); the driving positioning spring (220) and the driving slider (230) are sleeved on the air pipe joint (900), the rear end of the air intake pipe (300) is connected to the air pipe joint (900), and the driven slider (240) is arranged on the air intake pipe (300).

9. The automatic ligation and cutting structure of the ligation device according to claim 8, characterized in that: The central axis of the driving positioning spring (220) is colinear with the central axis of the driven positioning spring (250).

10. The automatic ligation and cutting structure of the ligation device according to claim 7, characterized in that: The central axis of the tension spring (400) is parallel to the central axis of the driving slider (230).

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