Visual ligator

Abstract

This application relates to the field of medical devices, and in particular to a visual ligation device. It includes a handle and a sleeve disposed at the end of the handle. An elastic ring is fitted onto the outside of the sleeve. A negative pressure mechanism is provided inside the handle. The negative pressure mechanism includes a connecting tube and a negative pressure generating component, which is used to create negative pressure within the connecting tube to draw target tissue into the sleeve. It also includes a driving device for releasing the elastic ring, and other structures. This application achieves the suction of target tissue through the negative pressure mechanism and the sequential release of the elastic ring through the driving device, effectively ligating the target tissue. Its structural design is reasonable, and its operation is convenient, better meeting the needs of ligation operations in the medical device field.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to a visual ligation device. Background Technology

[0002] Endoscopic ligation devices are used in conjunction with endoscopes and are mainly used for the ligation treatment of varicose veins, internal hemorrhoids, and digestive tract polyps. Their performance directly affects the accuracy, safety, and treatment effect of the surgery and occupies an important position in clinical diagnosis and treatment.

[0003] Existing ligation devices include a handle and a sleeve located at the end of the handle. The handle serves as the operating end for medical personnel to hold and manipulate. The sleeve is fixedly located at the end of the handle, and an elastic ring is fitted on the outside of the sleeve. The elastic ring is usually made of medical elastic material. In actual surgical procedures, after medical personnel observe the location and morphology of the lesion tissue through an endoscope, they manipulate the handle to move the sleeve closer to the target tissue. Subsequently, the elastic rings on the outside of the sleeve are dislodged from the sleeve and then fitted onto the root of the tissue to be ligated.

[0004] However, in clinical practice, the shapes of tissues that need to be ligated (such as polyps) vary, making it difficult for medical staff to accurately place the elastic band around the root of the tissue. This makes the operation inconvenient and affects the surgical outcome. Therefore, there is an urgent need for a ligation device that can achieve precise positioning. Summary of the Invention

[0005] To address the aforementioned problems, this application provides a ligation device.

[0006] The present application provides a visual ligation device with the following technical solution: a ligation device includes a handle and a sleeve disposed at the end of the handle. An elastic ring for ligating target tissue is sleeved on the outside of the sleeve. A negative pressure mechanism is provided inside the handle. The negative pressure mechanism includes a connecting tube and a negative pressure generating component. One end of the connecting tube extends into the sleeve, and the other end of the connecting tube is connected to the negative pressure generating component. The negative pressure generating component is used to generate negative pressure in the connecting tube to draw the target tissue into the sleeve.

[0007] By adopting the above technical solution, an integrated negative pressure mechanism can be formed inside the handle to create a controllable negative pressure inside the sleeve, which can stably adsorb and accurately position the target tissue with varying shapes. After the elastic ring falls off the sleeve, it can be directly ligated at the root of the target tissue, solving the problem that existing ligation devices are difficult to accurately ligate the root of the lesion. No external negative pressure equipment is required, the operation is convenient, and the safety of the surgery and the treatment effect are guaranteed at the same time.

[0008] Preferably, the negative pressure generating component includes a cylinder, a piston, and a driving component. The piston is slidably sealed in the inner cavity of the cylinder. The driving component is used to drive the piston to slide along the axial direction of the cylinder. The cylinder is provided with a reset elastic element for driving the piston to reset. The connecting pipe is connected to the cylinder.

[0009] By adopting the above technical solution, a purely mechanical manual negative pressure generating structure is constructed through the cooperation of the cylinder, the sliding seal piston, the driving component, and the reset elastic component. It can stably output controllable negative pressure without external power supply. The structure is simple, the failure rate is low, and the manufacturing cost is controllable. The reset elastic component can realize the automatic reset of the piston, providing a structural basis for continuous negative pressure operation and simplifying the continuous bandaging operation process.

[0010] Preferably, the driving component includes a driving wheel, a pull rope, and a pressing block; the driving wheel is rotatably disposed inside the handle, one end of the pull rope is fixedly connected to the driving wheel, and the other end of the pull rope is fixedly connected to the piston; the pressing block is slidably disposed on the handle, and the pressing block and the driving wheel are connected by a gear and rack structure.

[0011] By adopting the above technical solution, the linear sliding of the pressing block is transformed into the rotational motion of the drive wheel, which in turn drives the piston to complete the negative pressure suction action through the pull rope. The gear and rack transmission has high precision and smooth transmission. The piston displacement can be precisely controlled by the pressing stroke, thereby accurately regulating the negative pressure value in the sleeve, avoiding tissue damage due to excessive negative pressure or suction failure due to insufficient negative pressure. At the same time, this structure has a short operating stroke and saves effort, enabling continuous pressing operation with one hand, which significantly reduces the operator's fatigue during long-term surgery.

[0012] Preferably, the driving component includes a pressing rod, a pull rod, and a shift fork; the pressing rod is rotatably connected to the handle, the pull rod is fixedly connected to the piston, and the pull rod is provided with a protrusion; the shift fork is disposed on the pressing rod, the pull rod is embedded in the opening of the shift fork, and the protrusion abuts against the shift fork; when the pressing rod rotates, the shift fork drives the pull rod and the piston to move axially.

[0013] By adopting the above technical solution, the driving force is amplified by lever principle, making operation more labor-saving; through the abutment and cooperation of the fork and the pull rod protrusion, the transmission is seamless and the action response is fast. The rotation angle of the pressing rod can intuitively reflect the movement distance of the piston, which makes it easy for doctors to accurately control the suction force according to the condition of the target tissue and adapt to the ligation needs of different parts and tissues of different sizes.

[0014] Preferably, the connecting pipe is connected to an air blowing pipe, and the air blowing pipe is provided with a control valve for controlling the opening and closing of the air blowing pipe.

[0015] By adopting the above technical solution, an air blowing pipe with a control valve is added to the connecting pipe, realizing the integration of negative pressure adsorption and positive air blowing functions. After the ligation operation is completed, positive airflow can be introduced into the sleeve through the air blowing pipe to quickly release the negative pressure state in the sleeve, so that the adsorbed tissue can be smoothly removed from the sleeve.

[0016] Preferably, the cylinder is connected to an air inlet pipe and an air outlet pipe; the air inlet pipe is provided with an air inlet one-way valve, the conduction direction of the air inlet one-way valve is from the connecting pipe to the inner cavity of the cylinder, the air outlet pipe is provided with an air outlet one-way valve, the conduction direction of the air outlet one-way valve is from the inner cavity of the cylinder outward, and the air inlet end of the air inlet pipe is connected to the connecting pipe.

[0017] By adopting the above technical solution, the inlet one-way valve and the outlet one-way valve work together to strictly limit the one-way flow path of the airflow: the inlet one-way valve only allows gas to flow into the inner cavity of the cylinder from the connecting pipe, and the outlet one-way valve only allows gas to be discharged out of the inner cavity of the cylinder, ensuring that there is no backflow of airflow during the reciprocating motion of the piston, avoiding the problem of negative pressure failure in the sleeve when the piston is reset. After the target tissue is sucked into the sleeve, the hand can be released, and there is no need to keep applying pressure to the pressing rod or pressing block, making the operation process more labor-saving.

[0018] Preferably, there are multiple elastic rings, which are sequentially sleeved on the outer wall of the sleeve along the length direction of the sleeve. A release line is wound around the outer wall of the sleeve, with both ends of the release line spirally wound around the outer wall of the sleeve. The middle part of the release line extends into the inside of the sleeve, and a release protrusion is provided on the release line. The handle is provided with a driving device for pulling the middle part of the release line. When the driving device pulls the middle part of the release line, the release protrusion can push the corresponding elastic rings in sequence, so that the elastic rings are released from the sleeve one by one.

[0019] By adopting the above technical solution, multiple elastic rings are arranged sequentially along the length of the sleeve. Combined with a double-headed spiral-wound release line and a release protrusion structure, the force is transmitted by pulling the middle of the release line using a drive device. The release protrusion enables the elastic rings to be pushed and released sequentially and orderly, fundamentally avoiding problems such as multiple elastic rings falling off simultaneously, accidental release, and release jamming. This ensures that the release action of the elastic rings is precise and controllable, adapting to the needs of multiple tying operations in a single operation. The overall structure is compact and adaptable to the miniaturized handle design, effectively improving the reliability of the elastic ring release process.

[0020] Preferably, the driving device includes a take-up reel rotatably disposed inside the handle, a connecting rope wound on the take-up reel, the connecting rope being fixedly connected to the middle of the release line, a limiting mechanism inside the handle for limiting unidirectional rotation of the take-up reel, and a driving mechanism inside the handle for driving unidirectional rotation of the take-up reel.

[0021] By adopting the above technical solution, a transmission structure using a winding wheel and connecting rope is used to pull the release line. The transmission method is stable and reliable, with uniform force distribution, and can accurately control the pulling amplitude of the release line, thereby controlling the release progress of the elastic ring. With the addition of a limit mechanism and a drive mechanism, the unidirectional rotation constraint of the winding wheel is realized, effectively preventing the winding wheel from reversing and causing the release line to slack and the elastic ring to fall off prematurely, ensuring the stability and continuity of the release action. The mechanical structure is simple and easy to process and assemble.

[0022] Preferably, the limiting mechanism includes an external ratchet ring fixedly connected coaxially to the take-up reel, and a limiting paddle that engages with the external ratchet ring is provided inside the handle; the driving mechanism includes a lever rotatably mounted on the handle, a mandrel rotatably connected inside the handle, the take-up reel being sleeved outside the mandrel, the lever driving the mandrel to rotate via a transmission component, and a limiting component provided on the take-up reel. The limiting component is used to restrict the relative rotation between the mandrel and the take-up reel. When the lever is pressed to drive the mandrel to rotate forward, the limiting component causes the mandrel and the take-up reel to form a transmission engagement, and the mandrel drives the take-up reel to rotate synchronously; when the lever is retracted to drive the mandrel to rotate in the opposite direction, the limiting component disengages the transmission engagement, the mandrel rotates freely relative to the take-up reel, and the take-up reel remains stationary under the action of the limiting mechanism.

[0023] By adopting the above technical solution, a purely mechanical limiting structure using an external ratchet ring and a limiting lever is employed to achieve unidirectional locking of the winding wheel. This provides stable locking force, rapid response, and effectively prevents reverse rotation of the winding wheel, avoiding loosening of the release line and ensuring the release accuracy of the elastic coil. The external ratchet ring is coaxially fixed with the winding wheel, resulting in high structural integration without additional space occupied by the handle, making it suitable for confined installation environments. It is durable and has a low failure rate. The manual drive structure, composed of a lever, spindle, and transmission components, offers ergonomic operation with effortless and convenient pressing. The limiting lever enables intermittent unidirectional transmission between the spindle and the winding wheel. Pressing the lever forward releases the transmission synchronously, while retracting the lever allows the spindle to spin freely and the winding wheel to remain stationary and locked. This single release can be completed without continuous force, optimizing the operating feel and preventing accidental triggering of the release action during retraction, further enhancing operational safety and accuracy.

[0024] Preferably, the sleeve is equipped with a camera module, and the sleeve is connected to the handle via a snake tube.

[0025] By adopting the above technical solution, the camera module can provide real-time feedback to the operator during actual use. Furthermore, due to the snake tube structure, the operator can flexibly adjust the observation angle and direction of the sleeve by manipulating the snake tube, thereby improving the adaptability of the field of vision and the convenience of operation during the operation.

[0026] Preferably, the limiting lever is slidably disposed inside the handle, and the handle is provided with an abutment spring and an electromagnet. The abutment spring drives the limiting lever to maintain contact with the outer ratchet ring, and the electromagnet drives the limiting lever to slide away from the outer ratchet ring when energized. The handle is also provided with a control mechanism to control the electromagnet to be energized or de-energized. When the lever is pressed, the control mechanism controls the electromagnet to be energized, and when the lever is released, the control mechanism controls the electromagnet to be de-energized.

[0027] By adopting the above technical solution, the abutment spring can keep the limiting plate in contact with the outer ratchet ring, realizing unidirectional limiting of the winding wheel; when the electromagnet is energized, it can drive the limiting plate to slide away from the outer ratchet ring, releasing the limiting of the winding wheel; the control mechanism can control the energization and de-energization of the electromagnet according to the pressing and releasing action of the lever, realizing flexible control of the rotation of the winding wheel. During the pressing process, the limiting plate does not contact the outer ratchet ring, which optimizes the pressing operation feel of the lever and reduces the operating resistance during the pressing process.

[0028] In summary, this application includes at least one of the following beneficial technical effects: 1. The built-in integrated negative pressure mechanism enables precise adsorption and positioning of diseased tissues with varying shapes. The unidirectional winding release structure enables precise sequential release of elastic coils. The visualized bend structure adapts to the operational needs of complex curved cavities such as the digestive tract. 2. The overall structure is highly integrated and can be directly used with conventional endoscopes. The entire process can be completed with one hand, which effectively solves the problems of existing ligation devices being difficult to accurately ligate the root of the lesion and inconvenient operation. It significantly improves the accuracy, safety and convenience of the operation, ensures the treatment effect, and has excellent clinical application value. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0030] Figure 2 This is a schematic diagram of the internal structure of the sleeve in Embodiment 1 of this application.

[0031] Figure 3 This application presents a schematic diagram of the overall structure of embodiment 2.

[0032] Figure 4 This is a schematic diagram of the driving component structure of Embodiment 2 of this application.

[0033] Figure 5 This is a schematic diagram of the installation of the elastic ring in Embodiment 2 of this application.

[0034] Figure 6 This is a schematic diagram of the release line winding in Embodiment 2 of this application.

[0035] Figure 7This is a schematic diagram of the drive mechanism assembly in Embodiment 2 of this application.

[0036] Figure 8 This is an exploded view of the limiting component assembly in Embodiment 2 of this application.

[0037] Figure 9 This is a schematic diagram of the installation of the limit lever in Embodiment 2 of this application.

[0038] Figure 10 This is an exploded view of the control mechanism assembly of Embodiment 2 of this application.

[0039] Explanation of reference numerals in the attached drawings: 1. Handle; 11. Outer sheath; 12. Inner sheath; 13. Coil; 14. Tension spring; 2. Sleeve; 21. Elastic ring; 22. Camera module; 3. Negative pressure mechanism; 31. Connecting pipe; 311. Air blowing pipe; 32. Negative pressure generating component; 321. Cylinder; 3211. Return spring; 322. Driving component; 3221. Pressing rod; 3222. Pull rod; 3223. Protrusion; 3224. Fork; 3225. Drive wheel; 3226. Pull rope; 3227. Pressing block; 323. Piston; 4. Air outlet pipe; 41. 5. Air intake pipe; 6. Release line; 7. Release protrusion; 8. Drive device; 9. Rewinding reel; 10. Limiting element; 11. Inner ratchet ring; 12. Pawl pin; 13. Miniature compression spring; 14. Drive mechanism; 15. Lever; 16. Spindle; 17. Drive gear; 18. Driven gear; 19. Connecting rope; 20. Limiting mechanism; 21. Outer ratchet ring; 22. Limiting lever; 33. Abutment spring; 44. Electromagnet; 55. Control mechanism; 66. Fixed block; 77. Fixed contact; 88. Movable plate; 99. Moving contact. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0041] Example 1 This application discloses a visual bandaging device. (Refer to...) Figure 1 as well as Figure 2The visual ligation device of this application includes a handle 1 for medical personnel to hold and operate, and a sleeve 2 located at the front end of the handle 1. An inner sheath 12 is fixedly connected to the end of the handle 1. The inner sheath 12 is made of rigid medical material. The sleeve 2 is located at the end of the inner sheath 12 away from the handle 1. The sleeve 2 and the inner sheath 12 are connected by a flexible snake tube 13. An outer sheath 11 is also wrapped around the snake tube 13 and the inner sheath 12. The outer sheath 11 is made of flexible material, is flexible, and protects the snake tube 13 and the inner sheath 12. The angle of the sleeve 2 can be adjusted. An elastic ring 21 made of medical elastic material is fitted on the outer wall of the sleeve 2 for ligating the target tissue. The handle 1 is a hollow shell structure, which integrates a negative pressure mechanism 3 and a driving device 6 that drives the elastic rings 21 to release one by one in sequence. The inner cavity of the sleeve 2 is connected to the negative pressure mechanism 3.

[0042] The negative pressure mechanism 3 includes a connecting tube 31 and a negative pressure generating component 32. One end of the connecting tube 31 extends into the inner cavity of the sleeve 2 after passing through the inner sheath tube 12, and the other end is connected to the negative pressure generating component 32. The negative pressure generating component 32 can form a controllable negative pressure in the connecting tube 31 and the inner cavity of the sleeve 2, sucking the target tissue with different shapes into the sleeve 2, realizing the precise positioning of the diseased tissue, and ensuring that the elastic ring 21 can be accurately ligated to the root of the target tissue.

[0043] The negative pressure generating component 32 includes a cylinder 321, a piston 323, and a driving component 322. The cylinder 321 is a transparent plastic cylinder and is fixedly installed inside the handle 1. The piston 323 is installed inside the cylinder 321 and is a rubber stopper that forms a sliding seal with the inner wall of the cylinder 321. A reset elastic element is also provided inside the cylinder 321. The reset elastic element is a reset spring 3211. The two ends of the reset spring 3211 are respectively abutted between the upper end face of the piston 323 and the inner wall of the end of the cylinder 321, which is used to drive the piston 323 to slide and automatically reset. The connecting pipe 31 is a flexible tube. One end of the connecting pipe 31 is connected to the bottom of the cylinder 321, and the other end passes through the outer sheath tube 11 and extends to the inner cavity of the sleeve 2.

[0044] To facilitate the sliding of the piston 323 within the cylinder 321, a driving component 322 is provided on the handle 1. In this embodiment, the driving component 322 adopts a lever-type structure, including a pressing rod 3221, a pull rod 3222, and a shift fork 3224. The middle part of the pressing rod 3221 is hinged to the outer shell of the handle 1 via a pivot. The pressing end of the pressing rod 3221 is exposed outside the handle 1, and the rotating end extends into the inner cavity of the handle 1. The end face of the piston 323 is fixedly connected to the pull rod 3222, which extends upward along the axial direction of the cylinder 321. A protrusion 3223 is integrally formed on the top outer wall of the pull rod 3222. The rotating end of the pressing rod 3221 is fixedly connected to the shift fork 3224, which has a U-shaped opening. The pull rod 3222 is embedded in the U-shaped opening of the shift fork 3224. The protrusion 3223 on the pull rod 3222 abuts against the upper end face of the shift fork 3224, forming abutment engagement. The two ends of the reset elastic element abut against the front end face of the piston 323 and the front end inner wall of the cylinder 321, respectively, for driving the piston 323 and the pull rod 3222 to reset forward.

[0045] When the exposed end of the pressing rod 3221 is pressed down, the pressing rod 3221 rotates, and the fork 3224 moves the protrusion 3223, thereby pulling the pull rod 3222 and the piston 323 upwards in the cylinder 321, compressing the return spring 3211, and creating a negative pressure in the chamber below the piston 323 in the cylinder 321. This negative pressure is transmitted to the port of the sleeve 2 through the connecting pipe 31 for adsorbing target tissue. After the pressing rod 3221 is released, the piston 323 returns to its original position under the action of the return spring 3211, and outside air can enter the cylinder 321 through the connecting pipe 31 or a specially designed one-way valve (described later).

[0046] A blowing pipe 311 is also connected to the connecting pipe 31. A manual control valve is installed on the blowing pipe 311. The operating end of the control valve is exposed on the outer wall of the handle 1. When it is necessary to separate the adsorbed tissue from the sleeve 2, the control valve can be opened and air can be blown into the blowing pipe 311 through the external air source. The airflow flows back into the sleeve 2 through the connecting pipe 31, blowing the target tissue away from the cylinder 321.

[0047] To optimize the gas path, an inlet pipe 41 and an outlet pipe 4 are connected to the cylinder 321. The outlet pipe 4 is connected to the bottom of the cylinder 321 and communicates directly with the bottom chamber of the cylinder 321. The end of the outlet pipe 4 away from the cylinder 321 is connected to an outlet check valve, which only allows gas to flow from the inside of the cylinder 321 to the outside. One end of the inlet pipe 41 is connected to the connecting pipe 31, and the other end is connected to the middle of the outlet pipe 4. The connection point between the inlet pipe 41 and the outlet pipe 4 is located between the cylinder 321 and the outlet check valve. An inlet check valve is installed at the connection point between the inlet pipe 41 and the connecting pipe 31, which only allows gas to flow from the connecting pipe 31 to the cylinder 321. When piston 323 slides upward, a negative pressure is formed in the cavity below piston 323 within cylinder 321. At this time, the inlet check valve opens and the outlet check valve closes, drawing air from sleeve 2 into cylinder 321. When piston 323 returns to its original position, the inlet check valve closes and the outlet check valve opens, expelling air from cylinder 321. In actual operation, once the target tissue is drawn into sleeve 2, the pressing rod 3221 can be released. At this time, the air in cylinder 321 is discharged from outlet pipe 4, while inlet pipe 41 remains closed, maintaining the adsorption state of the target tissue.

[0048] The implementation principle of the visual ligation device in Embodiment 1 of this application is as follows: During surgery, the operator aligns the sleeve 2 with the target tissue. Pressing the pressing rod 3221 closes the outlet one-way valve and opens the inlet one-way valve, creating a negative pressure in the inner cavity of the sleeve 2 through the connecting pipe 31, drawing the target tissue of varying shapes into the inner cavity of the sleeve 2, aligning the root of the target tissue with the elastic ring 21 on the outer wall of the sleeve 2. When the pressing rod 3221 is released, the return spring 3211 pushes the piston 323 to slide back to its original position, closing the inlet one-way valve and opening the outlet one-way valve, allowing the gas in the cylinder 321 to be discharged to the outside through the outlet pipe 4, completing one suction cycle. By repeatedly pressing the pressing block 3227, a stable negative pressure can be formed inside the sleeve 2, firmly adsorbing the target tissue, maintaining the adsorption state without continuous pressing. After ligation, the control valve on the air blowing pipe 311 can be opened to blow air, assisting in the separation of the target tissue from the sleeve 2.

[0049] Example 2 The core difference between this embodiment and Embodiment 1 is that the driving component 322 of the negative pressure generating component 32 can be rotary.

[0050] Reference Figure 3 as well as Figure 4The driving component 322 includes a drive wheel 3225 rotatably disposed within the handle 1, a pull rope 3226 wound around the drive wheel 3225, and a pressing block 3227 slidably disposed on the side of the handle 1. A transmission rack is fixedly connected to the inner side of the pressing block 3227, and the transmission rack meshes with a transmission gear coaxially fixed on the drive wheel 3225. When the pressing block 3227 is pressed, the drive wheel 3225 is rotated through the gear and rack transmission, thereby winding the pull rope 3226. The other end of the pull rope 3226 pulls the piston 323 to move within the cylinder 321, generating negative pressure. After the pressing block 3227 is released, the piston 323 returns to its original position under the action of the return spring 3211.

[0051] In addition, refer to Figure 5 as well as Figure 6 Multiple medical-grade rubber elastic rings 21 are sequentially fitted onto the outside of the sleeve 2. A nylon release line 5 is wound around the outer wall of the sleeve 2. The two ends of the release line 5 are symmetrically wound in a double-headed spiral pattern around the outer wall of the sleeve 2. The ends of the release line 5 are symmetrically fixed at both ends of the diameter at the root of the sleeve 2. The release line 5 and the elastic rings 21 are alternately spaced along the length of the sleeve 2. A spiral segment is arranged between every two adjacent elastic rings 21, and part of the release line 5 is covered by the elastic ring 21. The middle part of the release line 5 passes through a small hole in the center of the sleeve 2 and extends into the outer sheath 11. On each spiral release line 5 on the outer wall of the sleeve 2, corresponding to the rear of each elastic ring 21, two rubber release protrusions 51 are adhered. The inner diameter of the elastic ring 21 is slightly smaller than the outer diameter of the sleeve 2, allowing it to be stably fitted onto the outside of the sleeve 2.

[0052] Reference Figure 4 as well as Figure 7 The handle 1 is equipped with a drive device 6 for pulling the middle of the release line 5. The drive device 6 includes a winding wheel 61, a connecting rope 63, a limiting mechanism 7, and a drive mechanism 62. The winding wheel 61 has a disc-shaped structure, and the connecting rope 63 is wound on the wheel body. The end of the connecting rope 63 away from the winding wheel 61 extends into the sleeve 2 and is fixedly connected to the middle of the release line 5. When the winding wheel 61 rotates in the forward direction, it winds the connecting rope 63 and pulls the middle of the release line 5.

[0053] The handle 1 is equipped with a limiting mechanism 7, which restricts the winding reel 61 to rotate only in one direction. Specifically, it includes an outer ratchet ring 71 that is coaxially and fixedly connected to the winding reel 61. The outer ratchet ring 71 is integrally set with the winding reel 61 and rotates synchronously with the winding reel 61. There are two outer ratchet rings 71, which are respectively set on both sides of the winding reel 61. The connecting rope 63 is set between the two outer ratchet rings 71. The outer ratchet ring 71 can also act as a side plate of the winding reel 61, restricting the movement of the connecting rope 63 in the axial direction of the winding reel 61. The handle 1 is equipped with a limiting paddle 72 that cooperates with the outer ratchet ring 71. The limiting paddle 72 is a metal spring piece. The limiting paddle 72 is set along the tangential direction of the outer circumferential surface of the outer ratchet ring 71. When the winding reel 61 rotates in the forward direction, the limiting paddle 72 slides on the inclined surface of the ratchet. When the winding reel 61 attempts to rotate in the reverse direction, the limiting paddle 72 will be locked on the ratchet, preventing the winding reel 61 from rotating in the reverse direction.

[0054] Reference Figure 7 as well as Figure 8 The handle 1 also includes a drive mechanism 62 that drives the take-up reel 61 to rotate in one direction. Specifically, this includes a lever 621 rotatably mounted on the outside of the handle 1, which is manually pressed by the operator. A spindle 622 is rotatably connected inside the handle 1. The take-up reel 61 is fitted over the spindle 622 and can rotate independently relative to it. The rotation axes of the lever 621, spindle 622, and take-up reel 61 are parallel to each other. The lever 621 drives the spindle 622 to rotate via a transmission component, which includes a drive gear 623 fixedly mounted on the shaft of the lever 621. A driven gear 624, meshing with the drive gear 623, is fixedly connected to the spindle 622. The high precision of the gear meshing transmission ensures that the movement of the lever 621 is synchronized with the rotation of the spindle 622. The handle 1 is also equipped with a tension spring 14 that drives the lever 621 to automatically reset. The two ends of the tension spring 14 are connected to the inner wall of the handle 1 and the lever 621 respectively. After the lever 621 is released, the tension spring 14 pulls the lever 621 to reset, without the need for manual reset.

[0055] A limiting member 611 is provided on the take-up reel 61 to limit the relative rotation between the mandrel 622 and the take-up reel 61, thereby achieving intermittent unidirectional transmission. The limiting member 611 includes an inner ratchet ring 6111 fixedly disposed inside the take-up reel 61. The inner ratchet ring 6111 is sleeved on the outside of the mandrel 622, and the ratchet slope direction of the inner ratchet ring 6111 is opposite to that of the outer ratchet ring 71. A pawl pin 6112 is embedded in the side wall of the mandrel 622. The pawl pin 6112 can slide radially along the mandrel 622. An elastic element is provided inside the mandrel 622 to drive the pawl pin 6112 to slide outward toward the outside of the mandrel 622. The elastic element is a miniature compression spring 6113. Under the drive of the elastic element, the pawl pin 6112 extends out of the mandrel 622 and is normally engaged with the inner ratchet ring 6111. The pawl pins 6112 are arranged in pairs, with each pair of pawl pins 6112 arranged symmetrically. There are two pairs of pawl pins 6112 on the spindle 622, and the two pairs of pawl pins 6112 are respectively arranged on both sides of the spindle 622.

[0056] When the operator wants to release the elastic ring 21, they press the lever 621. The lever 621 drives the drive gear 623 to rotate, which in turn drives the spindle 622 to rotate forward through the driven gear 624. At this time, the pawl pin 6112 is stably engaged with the inner ratchet ring 6111, and the spindle 622 forms a rigid transmission connection with the winding wheel 61. The spindle 622 drives the winding wheel 61 to rotate forward synchronously, winding the connecting rope 63 and pulling the release line 5, thus completing the preparation for releasing the elastic ring 21. After releasing the lever 621... The tension spring 14 drives the lever 621 to return to its original position in the reverse direction, causing the spindle 622 to rotate in the reverse direction. At this time, the inclined surfaces of the inner ratchet ring 6111 and the pawl pin 6112 press against each other, and the pawl pin 6112 compresses the elastic element and retracts. The transmission connection between the spindle 622 and the winding wheel 61 is released, and the spindle 622 rotates freely relative to the winding wheel 61. The winding wheel 61 remains stationary under the locking action of the outer ratchet ring 71 and the limit lever 72, preventing the release line 5 from slackening and ensuring the stable position of the elastic ring 21.

[0057] Reference Figure 9 as well as Figure 10 The handle 1 is also equipped with a control mechanism 9 for controlling the on and off of the electromagnet 81. The drive gear 623 is rotatably connected to the lever 621. The two drive gears 623 are fixedly connected by a bushing. The middle part of the bushing is rotatably connected to the lever 621. A fixed shaft fixedly connected to the handle 1 is sleeved inside the bushing. The transmission axis of the drive gear 623 coincides with the rotation axis of the lever 621. The control mechanism 9 includes a fixed block 91 and a movable plate 92. The fixed block 91 is fixedly connected to the lever 621. The movable plate 92 is fixedly connected to the drive gear 623. There are two movable plates 92, which are symmetrically arranged on both sides of the rotation axis of the lever 621. The fixed block 91 is arranged between the two movable plates 92. The fixed block 91 is arranged in a fan shape. A moving contact 921 is provided on the movable plate 92 facing the fixed block 91. The two sides of the fixed block 91 are provided with stationary contacts 911 corresponding to the moving contact 921.

[0058] The handle 1 is also equipped with a control mechanism 9 for controlling the on and off of the electromagnet 81. The drive gear 623 is rotatably connected to the lever 621. The two drive gears 623 are fixedly connected by a bushing. The middle part of the bushing is rotatably connected to the lever 621. A fixed shaft fixedly connected to the handle 1 is sleeved inside the bushing. The transmission axis of the drive gear 623 coincides with the rotation axis of the lever 621. The control mechanism 9 includes a fixed block 91 and a movable plate 92. The fixed block 91 is fixedly connected to the lever 621. The movable plate 92 is fixedly connected to the drive gear 623. There are two movable plates 92, which are symmetrically arranged on both sides of the rotation axis of the lever 621. The fixed block 91 is arranged between the two movable plates 92. The fixed block 91 is arranged in a fan shape. A moving contact 921 is provided on the movable plate 92 facing the fixed block 91. Static contacts 911 corresponding to the moving contacts 921 are provided on both sides of the fixed block 91.

[0059] In this embodiment, both the stationary contact 911 and the moving contact 921 are connected to the circuit, and the stationary contact 911 is electrically connected to the microcontroller. The microcontroller is integrated inside the handle 1 with a reserved mounting position, without occupying too much extra space. When the lever 621 rotates forward (press operation), the lever 621 drives the fixed block 91 to move, generating relative displacement with the movable plate 92 (on the drive gear 623). At this time, the stationary contact 911 on one side of the fixed block 91 contacts the moving contact 921 on the movable plate 92, generating a jog electrical signal and transmitting it to the microcontroller. When the lever 621 rotates in the reverse direction (reset operation), the movable plate 92 on the other side moves relative to the fixed block 91, triggering the stationary contact 911 on the other side of the fixed block 91 to conduct, generating a corresponding electrical signal.

[0060] The microcontroller continuously controls the energization or de-energization of the electromagnet 81 based on the detected rotation direction: when the lever 621 is detected to be pressed and rotated in the forward direction, the microcontroller continuously outputs an energizing signal to control the electromagnet 81 to be continuously energized, attracting the limiting lever 72 to remain disengaged from the outer ratchet ring 71. At this time, the outer ratchet ring 71 has no locking resistance, completely eliminating the pressing resistance caused by the contact between the limiting lever 72 and the outer ratchet ring 71, greatly reducing the pressing force of the lever 621 and making operation easier; when the lever 621 is detected to be reset in the reverse direction, the microcontroller immediately cuts off the power supply to the electromagnet 81, the electromagnet 81 is de-energized, and the limiting lever 72 quickly resets under the action of the abutment spring 8, re-engaging with the outer ratchet ring 71, restoring the one-way locking of the winding wheel 61, and preventing the winding wheel 61 from reversing.

[0061] The inner front end of the sleeve 2 can integrate a miniature camera module 22 (such as a CCD or CMOS sensor), and the camera signal line also passes through the snake tube 13 and connects to the processing circuit and display inside the handle 1. The snake tube 13 is composed of multiple interlocking metal segments, and its bending angle can be adjusted by the control component (such as a knob or dial) on the handle 1. The control component is connected to the end segment of the snake tube 13 via a pull wire. This design allows the operator to flexibly adjust the observation angle and direction of the sleeve 2 by simply controlling the handle 1 without making significant adjustments to the endoscope angle. It is especially suitable for finding and locating target tissues in the bends of the digestive tract, greatly improving the adaptability of the surgical field and the convenience of operation.

[0062] The implementation principle of a visual ligation device in Embodiment 2 of this application is as follows: Medical personnel press the pressing block 3227 on the handle 1. The pressing block 3227 slides along the groove, driving the drive wheel 3225 to rotate synchronously via gear and rack transmission. When the drive wheel 3225 rotates, it winds up the pull rope 3226. The pull rope 3226 pulls the piston 323 to slide axially along the cylinder 321, creating a negative pressure inside the cylinder 321. Then, the lever 621 drives the spindle 622 to rotate forward via gear transmission. The pawl pin 6112 meshes with the inner ratchet ring 6111, and the spindle 622 drives the winding wheel 61 to rotate forward, winding the connecting rope 63 and pulling the middle of the release line 5. The release line 5 is continuously... Pull the cable into the sleeve 2 and the inner sheath 12. The release line 5 drives the release protrusion 51 to push the corresponding elastic ring 21, so that the elastic ring 21 is smoothly disengaged from the sleeve 2, completing a single banding. After releasing the lever 621, the tension spring 14 drives the lever 621 to automatically reset. At the same time, the lever 621 drives the spindle 622 to rotate in the opposite direction. The pawl pin 6112 disengages from the inner ratchet ring 6111, the spindle 622 spins freely, and the winding wheel 61 remains stationary under the limiting action of the limiting piece 72 and the outer ratchet ring 71. The release line 5 does not loosen and waits for the next pressing operation. Repeat the above pressing-resetting action to achieve the sequential, orderly and precise release of multiple elastic rings 21.

[0063] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A visual ligator, comprising a handle (1) and a sleeve (2) arranged at the end of the handle (1), the outside of the sleeve (2) being sleeved with an elastic ring (21) for ligating target tissue, characterized in that: The handle (1) is provided with a negative pressure mechanism (3), which includes a connecting tube (31) and a negative pressure generating component (32). One end of the connecting tube (31) extends into the sleeve (2), and the other end of the connecting tube (31) is connected to the negative pressure generating component (32). The negative pressure generating component (32) is used to generate negative pressure in the connecting tube (31) to draw the target tissue into the sleeve (2).

2. The visible ligator of claim 1, wherein: The negative pressure generating assembly (32) includes a cylinder (321), a piston (323), and a driving member (322). The piston (323) is slidably sealed in the inner cavity of the cylinder (321). The driving member (322) is used to drive the piston (323) to slide along the axial direction of the cylinder (321). The cylinder (321) is provided with a reset elastic member for driving the piston (323) to reset. The connecting pipe (31) is connected to the cylinder (321).

3. The visible ligator of claim 2, wherein: The driving component (322) includes a driving wheel (3225), a pull rope (3226), and a pressing block (3227); the driving wheel (3225) is rotatably disposed inside the handle (1), one end of the pull rope (3226) is fixedly connected to the driving wheel (3225), and the other end of the pull rope (3226) is fixedly connected to the piston (323); the pressing block (3227) is slidably disposed on the handle (1), and the pressing block (3227) and the driving wheel (3225) are connected by a gear and rack structure.

4. The visible ligator of claim 2, wherein: The driving component (322) includes a pressing rod (3221), a pull rod (3222), and a shift fork (3224); the pressing rod (3221) is rotatably connected to the handle (1), the pull rod (3222) is fixedly connected to the piston (323), and the pull rod (3222) is provided with a protrusion (3223); the shift fork (3224) is provided on the pressing rod (3221), the pull rod (3222) is embedded in the opening of the shift fork (3224), and the protrusion (3223) abuts against the shift fork (3224); when the pressing rod (3221) rotates, the pull rod (3222) and the piston (323) are driven to move axially through the shift fork (3224).

5. The visual ligation device according to claim 3 or 4, characterized in that: The connecting pipe (31) is connected to an air blowing pipe (311), and the air blowing pipe (311) is provided with a control valve for controlling the opening and closing of the air blowing pipe (311).

6. The visual ligation device according to claim 5, characterized in that: The cylinder (321) is connected to an air inlet pipe (41) and an air outlet pipe (4); the air inlet pipe (41) is provided with an air inlet one-way valve, the direction of the air inlet one-way valve is from the connecting pipe (31) to the inner cavity of the cylinder (321), the air outlet pipe (4) is provided with an air outlet one-way valve, the direction of the air outlet one-way valve is from the inner cavity of the cylinder (321) outward, and the air inlet end of the air inlet pipe (41) is connected to the connecting pipe (31).

7. The visual ligation device according to claim 1, characterized in that: There are multiple elastic rings (21), and multiple elastic rings (21) are sequentially sleeved on the outer wall of the sleeve (2) along the length direction of the sleeve (2). The outer wall of the sleeve (2) is wound with a release line (5). The two ends of the release line (5) are wound in a double-headed spiral shape on the outer wall of the sleeve (2). The middle part of the release line (5) extends into the inside of the sleeve (2). The release line (5) is provided with a release protrusion (51). The handle (1) is provided with a driving device (6) for pulling the middle part of the release line (5). When the driving device (6) pulls the middle part of the release line (5), the release protrusion (51) can push the corresponding elastic ring (21) in sequence, so that the elastic ring (21) is released from the sleeve (2) one by one.

8. The visual ligation device according to claim 7, characterized in that: The drive device (6) includes a take-up reel (61) rotatably disposed inside the handle (1), a connecting rope (63) is wound on the take-up reel (61), the connecting rope (63) is fixedly connected to the middle of the release line (5), a limiting mechanism (7) is provided inside the handle (1), the limiting mechanism (7) is used to limit the unidirectional rotation of the take-up reel (61), and a drive mechanism (62) is provided inside the handle (1) to drive the unidirectional rotation of the take-up reel (61).

9. The visual ligation device according to claim 8, characterized in that: The limiting mechanism (7) includes an outer ratchet ring (71) coaxially fixedly connected to the take-up reel (61), and a limiting paddle (72) cooperating with the outer ratchet ring (71) is provided inside the handle (1); the driving mechanism (62) includes a lever (621) rotatably mounted on the handle (1), a spindle (622) rotatably connected inside the handle (1), the take-up reel (61) being sleeved outside the spindle (622), the lever (621) driving the spindle (622) to rotate through a transmission component, and a limiting component (611) is provided on the take-up reel (61). The limiting component (611) is used to limit the relative rotation between the mandrel (622) and the take-up wheel (61). When the lever (621) is pressed and the mandrel (622) is rotated in the forward direction, the limiting component (611) makes the mandrel (622) and the take-up wheel (61) form a transmission engagement, and the mandrel (622) drives the take-up wheel (61) to rotate synchronously. When the lever (621) is retracted and the mandrel (622) is rotated in the reverse direction, the limiting component (611) releases the transmission engagement, and the mandrel (622) rotates freely relative to the take-up wheel (61). The take-up wheel (61) remains stationary under the action of the limiting mechanism (7).

10. The visual ligation device according to claim 1, characterized in that: The sleeve (2) is equipped with a camera module (22), and the sleeve (2) is connected to the handle (1) through a snake tube (13).

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