An elastic ring releasing device for a ligator

Abstract

The application relates to the field of medical devices, in particular to a ligation device elastic ring releasing device which comprises a sleeve arranged at the end of a handle, the sleeve is used for mounting elastic rings, a plurality of elastic rings are sleeved on the outer wall of the sleeve, the sleeve is wound with a releasing wire, the two ends of the releasing wire are wound in a double-end spiral shape on the outer wall of the sleeve, the middle part of the releasing wire extends to the inside of the sleeve, the releasing wire and the elastic rings are alternately and spacedly arranged, the releasing wire is provided with a releasing protrusion, the handle is internally provided with a driving device for pulling the middle part of the releasing wire, the releasing protrusion pushes the elastic ring to release when the releasing wire is pulled, the driving device comprises a winding wheel, a connecting rope and the like, and is also provided with a limiting mechanism and a driving mechanism and the like which work cooperatively. The application can conveniently and stably release a plurality of elastic rings in sequence, the operation is simple and reliable, the ligation efficiency and accuracy can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to a release device for an elastic band of a ligation device. Background Technology

[0002] Currently, in minimally invasive medical surgeries and clinical ligation procedures, ligation devices are widely used in medical scenarios such as tissue ligation and lesion ligation resection due to their advantages of convenient operation and minimal trauma. Existing ligation devices mostly adopt manual traction type or push rod advance type drive structure, which drives the elastic coils to be released in sequence through the traction mechanism to achieve ligation and fixation of the target tissue.

[0003] The ligation process of a traditional ligator is as follows: by rotating the handle on the rotary knob, the pull reel is rotated, which in turn pulls the release line connected to the pull reel towards the operator's side. The release protrusion on the release line drives the elastic ring to complete the release. Continuing to rotate the rotary knob can cause the release line to retract in segments, triggering the release of multiple rings in sequence. After the elastic ring is released, it is placed on the affected area and automatically tightens by its own elasticity, thus achieving tissue ligation.

[0004] However, existing methods for releasing elastic coils have significant drawbacks. Manual operation requires a high level of experience and skill from medical personnel, making it difficult to guarantee consistent release force and accuracy each time. Furthermore, the complex mechanical structures and pneumatic devices often result in complex and costly ligatures, and may lead to malfunctions or instability during actual operation, affecting the reliability of elastic coil release. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a release device for the elastic band of a ligation device.

[0006] The present application provides a release device for elastic rings of a ligator, which adopts the following technical solution: A release device for elastic rings of a ligator includes a sleeve disposed at the end of a handle. The sleeve is used to fit elastic rings. Multiple elastic rings are sequentially fitted onto 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. The two ends of the release line are wound in a double-headed spiral around the outer wall of the sleeve. The middle part of the release line extends into the inside of the sleeve. A release protrusion is provided on the release line. A driving device is provided inside the handle 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 sequentially push the corresponding elastic rings, causing the elastic rings to be released from the sleeve one by one.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] Preferably, the limiting mechanism includes an outer ratchet ring fixedly connected coaxially to the winding reel, and the handle is provided with a limiting paddle that cooperates with the outer ratchet ring.

[0011] By adopting the above technical solution, a purely mechanical limiting structure using an external ratchet ring and a limiting paddle is used to achieve one-way locking of the winding wheel. The locking force is stable and the response is rapid, which can effectively prevent the winding wheel from rotating in the opposite direction and avoid the release line from loosening and affecting the release accuracy of the elastic ring. The external ratchet ring is fixed coaxially with the winding wheel, with high structural integration, without occupying additional internal space of the handle, making it suitable for narrow installation environments, and it is durable and has a low failure rate.

[0012] Preferably, the driving mechanism includes a lever rotatably mounted on a handle, a mandrel rotatably connected inside the handle, a take-up reel sleeved outside the mandrel, the lever driving the mandrel to rotate via a transmission component, and a limiting component on the take-up reel 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.

[0013] By adopting the above technical solution, a manual drive structure is formed by a lever, spindle, and transmission components. The operation method is ergonomic, and the pressing operation is effortless and convenient. The intermittent unidirectional transmission between the spindle and the winding wheel is realized by the limiting component. When the lever is pressed to rotate forward, the transmission is released synchronously. When retracting, the spindle spins freely and the winding wheel is locked at rest. A single release can be completed without continuous force, which optimizes the operating feel and avoids accidental triggering of the release action during the retraction process, further improving the safety and accuracy of operation.

[0014] Preferably, the limiting member includes an inner ratchet ring disposed on the winding reel, the inner ratchet ring being sleeved on the outside of the mandrel, the ratchet inclined surface of the inner ratchet ring being opposite to that of the outer ratchet ring, a pawl pin being embedded on the mandrel, and an elastic element being disposed inside the mandrel to drive the pawl pin to slide toward the outside of the mandrel, the pawl pin engaging with the inner ratchet ring under the drive of the elastic element.

[0015] By adopting the above technical solution, a clutch structure consisting of an inner ratchet ring, a pawl pin, and an elastic element is used. Combined with the reverse inclined surface design of the inner and outer ratchet rings, it perfectly adapts to the working logic of forward transmission and reverse idling. The clutch action is sensitive and smooth, without any jamming or delay. The elastic element continuously drives the pawl pin to mesh with the inner ratchet ring, ensuring no slippage and stable power transmission during forward transmission, and low resistance during reverse idling, which greatly improves the overall transmission efficiency and operational smoothness of the device.

[0016] Preferably, the rotation axis of the lever is parallel to the rotation axis of the spindle, the transmission component includes a driving gear fixedly mounted on the lever, and a driven gear meshing with the driving gear is fixedly connected to the spindle.

[0017] By adopting the above technical solution, the rotation axis of the lever and the spindle are set parallel to each other, and the rotation of the lever can be stably and reliably transmitted to the spindle through the meshing of the driving gear and the driven gear, so as to realize the effective transmission of power, thereby driving the winding wheel to rotate to pull the middle of the release line and push the elastic ring to disengage from the sleeve. At the same time, the parallel rotation axis and the gear transmission method make the structure compact and easy to arrange in the limited space of the handle.

[0018] Preferably, the handle is provided with a tension spring for resetting the drive lever.

[0019] By adopting the above technical solution, the tension spring can drive the lever to reset. After pressing the lever, the lever can automatically return to its initial position, which facilitates subsequent operation of the lever to control the release device of the elastic ring of the bandage, thus improving the convenience and continuity of operation.

[0020] 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.

[0021] 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.

[0022] Preferably, the drive gear is rotatably mounted on the lever, and the rotation axis of the drive gear coincides with the rotation axis of the lever. The control mechanism includes a fixed block fixedly connected to the lever and a movable plate fixedly connected to the drive gear. There are two movable plates symmetrically arranged on both sides of the rotation axis of the lever. The fixed block is located between the two movable plates. The fixed block has a stationary contact facing the movable plate, and the movable plate has a moving contact corresponding to the stationary contact.

[0023] By adopting the above technical solution, and by setting the drive gear on the lever with their rotation axes coinciding, the coaxial rotation coordination of the drive gear and the lever is ensured, and a basis for their relative movement is provided without affecting the normal transmission function of the lever driving the drive gear. When the lever rotates forward or backward, it first drives the fixed block to rotate synchronously, causing relative displacement between the fixed block and the movable plate until one of the movable plates abuts against the fixed block. Only then will the drive gear be driven to rotate synchronously forward or backward with the lever. During the relative movement before the fixed block abuts against the movable plate, the moving and stationary contacts on the corresponding sides make precise contact and conduction, achieving accurate identification of the lever's rotation direction. This provides a reliable direction signal basis for subsequent microcontroller control. Furthermore, the overall structure has a high degree of integration with the lever and drive gear, does not occupy additional internal space in the handle, and is suitable for the miniaturized design requirements of the tying device.

[0024] Preferably, the stationary contact is electrically connected to a microcontroller. When the lever rotates forward or backward and the fixed block and the movable plate move relative to each other, causing the moving contact to contact the stationary contact, an electrical signal is generated and input to the microcontroller. The microcontroller is configured to identify the rotation direction of the lever based on the jogging electrical signal generated by the connection between the moving contact and the stationary contact on different sides, and to continuously control the electromagnet to be energized or de-energized according to the rotation direction.

[0025] By adopting the above technical solution, the microcontroller identifies the rotation direction of the lever based on the sequential order of two jog electrical signals. It can accurately and automatically control the electromagnet to be energized or de-energized according to the rotation direction of the lever, thereby controlling the engagement or disengagement of the limit lever and the outer ratchet ring. This achieves precise control of the position of the limit lever and ensures the stable and accurate operation of the elastic ring release device of the banding device.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The drive device pulls the middle of the release line, and the release protrusion pushes the corresponding elastic ring in sequence, so that the elastic ring is released from the sleeve. This can reduce the requirements for the experience and skills of medical staff and ensure the release force and accuracy.

[0028] 2. The two ends of the release line are wound in a double-headed spiral around the outer wall of the sleeve. The release line and the elastic ring are alternately set along the length of the sleeve. The structure is relatively simple and can reduce the cost of the ligation device.

[0029] 3. The setting of the limit mechanism and drive mechanism enables the winding wheel to rotate in one direction, ensuring the stability and reliability of the elastic ring release process. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0031] Figure 2 This is a schematic diagram of the installation of the elastic ring according to an embodiment of this application.

[0032] Figure 3 This is a schematic diagram of the release line winding according to an embodiment of this application.

[0033] Figure 4 This is a schematic diagram of the drive device structure according to an embodiment of this application.

[0034] Figure 5 This is a schematic diagram of the drive mechanism assembly according to an embodiment of this application.

[0035] Figure 6 This is an exploded view of the assembly of the limiting component according to an embodiment of this application.

[0036] Figure 7 This is a schematic diagram of the installation of the limit lever according to an embodiment of this application.

[0037] Figure 8 This is an exploded view of the control mechanism assembly according to an embodiment of this application.

[0038] Explanation of reference numerals in the attached drawings: 1. Handle; 11. Sleeve; 12. Elastic ring; 13. Release line; 131. Release protrusion; 2. Drive device; 21. Rewinding reel; 211. Limiting element; 2111. Inner ratchet ring; 2112. Pad pin; 2113. Elastic element; 22. Drive mechanism; 221. Lever; 222. Spindle; 223. Drive gear; 224. Driven gear; 23. Connecting rope; 3. Limiting mechanism; 31. Outer ratchet ring; 32. Limiting paddle; 4. Abutment spring; 41. Electromagnet; 5. Control mechanism; 51. Fixed block; 52. Movable plate; 53. Moving contact; 54. Stationary contact; 6. Tension spring. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0040] This application discloses a release device for the elastic band of a ligation device. (Refer to...) Figure 1 as well as Figure 2 The device includes a sleeve 11 located at the end of the handle 1 and a drive device 2 located inside the handle 1. The sleeve 11 and the handle 1 are fixedly connected by an outer sheath. The sleeve 11 is used to install the elastic ring 12, and the drive device 2 is used to pull the middle of the release line 13, causing the release protrusions 131 on the release line 13 to push the corresponding elastic rings 12 in sequence, driving the elastic rings 12 to detach from the sleeve 11 and release them. This achieves accurate and reliable release of the elastic rings 12, while avoiding the problems caused by complex mechanical structures and pneumatic devices, simplifying the structure of the ligator and reducing costs. This is because the release line 13 and the release protrusions 131 work together to precisely control the release of the elastic rings 12, and the structure is relatively simple.

[0041] Reference Figure 2 as well as Figure 3 Multiple elastic rings 12 are sequentially sleeved along the length of the sleeve 11. A release line 13 is wound around the outside of the sleeve 11, with the ends of the release line 13 symmetrically fixed at both ends of the diameter direction at the root of the sleeve 11. The two ends of the release line 13 are wound in a double-headed spiral around the outer wall of the sleeve 11. This winding method allows the release line 13 to apply force to the elastic rings 12 more evenly when pulled. The middle of the release line 13 extends into the inside of the sleeve 11. The release line 13 and the elastic rings 12 are alternately arranged along the length of the sleeve 11. The elastic rings 12 partially cover the outside of the release line 13. A spiral section is arranged between every two adjacent elastic rings 12. The release line 13 is provided with release protrusions 131, which are located on the exposed spiral section of the release line 13. At least two release protrusions 131 are provided behind each elastic ring 12.

[0042] The sleeve 11 is typically made of rigid plastic or metal to ensure sufficient strength to support the elastic ring 12. The release line 13 can be nylon thread or steel wire rope; nylon thread is soft and less expensive, while steel wire rope is stronger. The release protrusions 131 can be small protrusions made of rubber or small bumps made of plastic, and are attached to the release line 13 by adhesive or integral molding. The elastic ring 12 is generally made of rubber and has good elasticity. The inner diameter of the elastic ring 12 is slightly smaller than the outer diameter of the sleeve 11 to ensure that the elastic ring 12 is stably fitted onto the sleeve 11. By pulling the middle of the release line 13 through the drive device 2, the release line 13 is tightened, causing the release protrusions 131 to move synchronously, and each elastic ring 12 is pushed sequentially to complete the release.

[0043] Reference Figure 4 The drive device 2 includes a take-up wheel 21 rotatably disposed inside the handle 1. The take-up wheel 21 has a disc-shaped structure and a connecting rope 23 is wound on the wheel body. One end of the connecting rope 23 away from the take-up wheel 21 extends into the sleeve 11 and is fixedly connected to the middle of the release line 13. When the take-up wheel 21 rotates in the forward direction, it winds the connecting rope 23 and pulls the middle of the release line 13.

[0044] The handle 1 is equipped with a limiting mechanism 3, which restricts the winding reel 21 to rotate only in one direction. Specifically, it includes an outer ratchet ring 31 that is coaxially and fixedly connected to the winding reel 21. The outer ratchet ring 31 is integrally set with the winding reel 21 and rotates synchronously with the winding reel 21. There are two outer ratchet rings 31, which are respectively set on both sides of the winding reel 21. The connecting rope 23 is set between the two outer ratchet rings 31. The outer ratchet ring 31 can also act as a side plate of the winding reel 21, restricting the movement of the connecting rope 23 in the axial direction of the winding reel 21. The handle 1 is equipped with a limiting paddle 32 that cooperates with the outer ratchet ring 31. The limiting paddle 32 is a metal spring piece. The limiting paddle 32 is set along the tangential direction of the outer circumferential surface of the outer ratchet ring 31. When the winding reel 21 rotates in the forward direction, the limiting paddle 32 slides on the inclined surface of the ratchet. When the winding reel 21 attempts to rotate in the reverse direction, the limiting paddle 32 will be locked on the ratchet, preventing the winding reel 21 from rotating in the reverse direction.

[0045] Reference Figure 5The handle 1 also includes a drive mechanism 22 that drives the take-up reel 21 to rotate in one direction. Specifically, this includes a lever 221 rotatably mounted on the outside of the handle 1, which is manually pressed by the operator. A spindle 222 is rotatably connected inside the handle 1. The take-up reel 21 is fitted over the spindle 222 and can rotate independently relative to it. The rotation axes of the lever 221, spindle 222, and take-up reel 21 are parallel to each other. The lever 221 drives the spindle 222 to rotate via a transmission component, which includes a drive gear 223 fixedly mounted on the shaft of the lever 221. A driven gear 224, meshing with the drive gear 223, is fixedly connected to the spindle 222. The high precision of the gear meshing transmission ensures that the movement of the lever 221 is synchronized with the rotation of the spindle 222. The handle 1 is also equipped with a tension spring 6 that drives the lever 221 to automatically reset. The two ends of the tension spring 6 are connected to the inner wall of the handle 1 and the lever 221 respectively. After the lever 221 is released, the tension spring 6 pulls the lever 221 to reset, without the need for manual reset.

[0046] Reference Figure 5 as well as Figure 6 The take-up reel 21 is equipped with a limiting member 211 to restrict the relative rotation between the mandrel 222 and the take-up reel 21, thereby achieving intermittent unidirectional transmission. The limiting member 211 includes an inner ratchet ring 2111 fixedly disposed inside the take-up reel 21. The inner ratchet ring 2111 is sleeved on the outside of the mandrel 222, and the ratchet slope direction of the inner ratchet ring 2111 is opposite to that of the outer ratchet ring 31. A pawl pin 2112 is embedded in the side wall of the mandrel 222. The pawl pin 2112 can slide radially along the mandrel 222. Inside the mandrel 222, there is an elastic member 2113 that drives the pawl pin 2112 to slide outward toward the outside of the mandrel 222. The elastic member 2113 is a miniature compression spring. Under the drive of the elastic member 2113, the pawl pin 2112 extends out of the mandrel 222 and is normally engaged with the inner ratchet ring 2111. The pawl pins 2112 are arranged in pairs, and each pair of pawl pins 2112 is symmetrically arranged. There are two pairs of pawl pins 2112 on the spindle 222, and the two pairs of pawl pins 2112 are respectively arranged on both sides of the spindle 222.

[0047] When the operator wants to release the elastic coil 12, they press the lever 221. The lever 221 drives the drive gear 223 to rotate, which in turn drives the spindle 222 to rotate forward through the driven gear 224. At this time, the pawl pin 2112 is stably engaged with the inner ratchet ring 2111, and the spindle 222 forms a rigid transmission connection with the winding wheel 21. The spindle 222 drives the winding wheel 21 to rotate synchronously forward, winding the connecting rope 23 and pulling the release line 13, thus completing the preparation for releasing the elastic coil 12. After releasing the lever 221... The tension spring 6 drives the lever 221 to return to its original position in the reverse direction, causing the spindle 222 to rotate in the reverse direction. At this time, the inclined surfaces of the inner ratchet ring 2111 and the pawl pin 2112 press against each other, and the pawl pin 2112 compresses the elastic element 2113 to retract. The transmission connection between the spindle 222 and the winding wheel 21 is released, and the spindle 222 rotates freely relative to the winding wheel 21. The winding wheel 21 remains stationary under the locking action of the outer ratchet ring 31 and the limiting lever 32, preventing the release line 13 from loosening and ensuring the stable position of the elastic ring 12.

[0048] Reference Figure 7 as well as Figure 8 To reduce the operating resistance during the pressing of lever 221 and optimize the operating feel, the handle 1 is equipped with an electronically controlled auxiliary unlocking component. The limiting lever 32 is slidably set in the guide groove inside the handle 1. The limiting lever 32 slides along the diameter direction of the outer ratchet ring 31. The handle 1 is equipped with a retaining spring 4 and an electromagnet 41. The two ends of the retaining spring 4 are respectively connected to the inner wall of the handle 1 and the limiting lever 32. Under normal conditions, the limiting lever 32 is driven to slide outward. The limiting lever 32 and the outer ratchet ring 31 maintain stable engagement, thereby achieving mechanical locking of the winding wheel 21. Electromagnet 41 is fixedly installed on the side of the limiting plate 32 away from the outer ratchet ring 31. When the electromagnet 41 is energized, it generates magnetism, attracting the limiting plate 32 to slide against the elastic force of the abutment spring 4, so that the limiting plate 32 moves away from the outer ratchet ring 31, thus releasing the engagement between the two. When the electromagnet 41 is de-energized, the magnetism disappears, and the limiting plate 32 is reset under the drive of the abutment spring 4, re-engaging with the outer ratchet ring 31.

[0049] The handle 1 is also equipped with a control mechanism 5 for controlling the on and off of the electromagnet 41. The drive gear 223 is rotatably connected to the lever 221. The two drive gears 223 are fixedly connected by a bushing. The middle part of the bushing is rotatably connected to the lever 221. A fixed shaft fixedly connected to the handle 1 is sleeved inside the bushing. The transmission axis of the drive gear 223 coincides with the rotation axis of the lever 221. The control mechanism 5 includes a fixed block 51 and a movable plate 52. The fixed block 51 is fixedly connected to the lever 221. The movable plate 52 is fixedly connected to the drive gear 223. There are two movable plates 52, symmetrically arranged on both sides of the rotation axis of the lever 221. The fixed block 51 is arranged between the two movable plates 52. The fixed block 51 is fan-shaped. A moving contact 53 is provided on the movable plate 52 facing the fixed block 51. Static contacts 54 corresponding to the moving contacts 53 are provided on both sides of the fixed block 51.

[0050] In this embodiment, both the stationary contact 54 and the moving contact 53 are connected to the circuit, and the stationary contact 54 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 221 rotates forward (press operation), the lever 221 drives the fixed block 51 to move, generating relative displacement with the movable plate 52 (on the drive gear 223). At this time, the stationary contact 54 on one side of the fixed block 51 contacts the moving contact 53 on the movable plate 52, generating a jog electrical signal and transmitting it to the microcontroller. When the lever 221 rotates in the reverse direction (reset operation), the movable plate 52 on the other side moves relative to the fixed block 51, triggering the stationary contact 54 on the other side of the fixed block 51 to conduct, generating a corresponding electrical signal.

[0051] The microcontroller continuously controls the energization or de-energization of the electromagnet 41 based on the detected rotation direction: when the lever 221 is detected to be pressed and rotated in the forward direction, the microcontroller continuously outputs an energizing signal to control the electromagnet 41 to be continuously energized, attracting the limiting lever 32 to remain disengaged from the outer ratchet ring 31. At this time, the outer ratchet ring 31 has no locking resistance, completely eliminating the pressing resistance caused by the contact between the limiting lever 32 and the outer ratchet ring 31, greatly reducing the pressing force of the lever 221 and making the operation more effortless; when the lever 221 is detected to be reset in the reverse direction, the microcontroller immediately cuts off the power supply to the electromagnet 41, the electromagnet 41 is de-energized, and the limiting lever 32 quickly resets under the action of the abutment spring 4, re-engaging with the outer ratchet ring 31, restoring the one-way locking of the winding wheel 21, and preventing the winding wheel 21 from reversing.

[0052] The implementation principle of the elastic ring 12 release device of the ligator in this embodiment is as follows: The operator manually presses the lever 221, which drives the spindle 222 to rotate forward through gear transmission. The pawl pin 2112 engages with the inner ratchet ring 2111, and the spindle 222 drives the winding wheel 21 to rotate forward, winding the connecting rope 23 and pulling the middle of the release line 13. The release line 13 tightens, causing the release protrusion 131 to push the corresponding elastic ring 12, so that the elastic ring 12 is smoothly released from the sleeve 11, completing a single ligation; the lever is then released. After lever 221 is engaged, tension spring 6 drives lever 221 to automatically reset. At the same time, lever 221 drives spindle 222 to rotate in the opposite direction. Pad pin 2112 disengages from inner ratchet ring 2111, spindle 222 spins freely, and winding wheel 21 remains stationary under the limiting action of limit plate 32 and outer ratchet ring 31. Release line 13 does not loosen and waits for the next pressing operation. By repeating the above pressing-reset action, multiple elastic coils 12 can be released sequentially, orderly and accurately. The whole operation is labor-saving and there are no jamming or accidental release problems.

[0053] 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 release device for the elastic ring of a ligation device, characterized in that: The device includes a sleeve (11) at the end of the handle (1), the sleeve (11) being used to fit elastic rings (12), multiple elastic rings (12) being sequentially fitted onto the outer wall of the sleeve (11) along the length direction of the sleeve (11), a release line (13) being wound around the outer wall of the sleeve (11), the two ends of the release line (13) being wound in a double-headed spiral around the outer wall of the sleeve (11), the middle part of the release line (13) extending into the interior of the sleeve (11), and a release protrusion (131) being provided on the release line (13), and a drive device (2) being provided inside the handle (1) for pulling the middle part of the release line (13), when the drive device (2) pulls the middle part of the release line (13), the release protrusion (131) can sequentially push the corresponding elastic rings (12), causing the elastic rings (12) to be released from the sleeve (11) one by one.

2. The elastic band release device for a ligation device according to claim 1, characterized in that: The drive device (2) includes a take-up reel (21) rotatably disposed inside the handle (1), a connecting rope (23) is wound on the take-up reel (21), the connecting rope (23) is fixedly connected to the middle of the release line (13), a limiting mechanism (3) is provided inside the handle (1), the limiting mechanism (3) is used to limit the unidirectional rotation of the take-up reel (21), and a drive mechanism (22) is provided inside the handle (1) to drive the unidirectional rotation of the take-up reel (21).

3. The elastic ring release device for a ligation device according to claim 2, characterized in that: The limiting mechanism (3) includes an outer ratchet ring (31) that is coaxially fixedly connected to the winding wheel (21), and the handle (1) is provided with a limiting paddle (32) that cooperates with the outer ratchet ring (31).

4. The elastic ring release device for a ligation device according to claim 3, characterized in that: The drive mechanism (22) includes a lever (221) rotatably mounted on a handle (1). A mandrel (222) is rotatably connected inside the handle (1). A take-up reel (21) is sleeved on the outside of the mandrel (222). The lever (221) drives the mandrel (222) to rotate via a transmission component. A limiting member (211) is provided on the take-up reel (21) to limit the relative rotation between the mandrel (222) and the take-up reel (21). When the lever (221) is pressed, it drives the spindle (222) to rotate in the forward direction. The limiting member (211) makes the spindle (222) and the take-up wheel (21) form a transmission engagement, and the spindle (222) drives the take-up wheel (21) to rotate synchronously. When the lever (221) retracts and drives the spindle (222) to rotate in the reverse direction, the limiting member (211) releases the transmission engagement, and the spindle (222) rotates freely relative to the take-up wheel (21). The take-up wheel (21) remains stationary under the action of the limiting mechanism (3).

5. The elastic ring release device for a ligation device according to claim 4, characterized in that: The limiting member (211) includes an inner ratchet ring (2111) disposed on the winding reel (21). The inner ratchet ring (2111) is sleeved on the outside of the mandrel (222). The ratchet slope direction of the inner ratchet ring (2111) is opposite to that of the outer ratchet ring (31). A pawl pin (2112) is embedded on the mandrel (222). An elastic element (2113) is provided inside the mandrel (222) to drive the pawl pin (2112) to slide toward the outside of the mandrel (222). The pawl pin (2112) engages with the inner ratchet ring (2111) under the drive of the elastic element (2113).

6. The elastic ring release device for a ligation device according to claim 5, characterized in that: The rotation axis of the lever (221) is parallel to the rotation axis of the spindle (222). The transmission component includes a drive gear (223) fixedly mounted on the lever (221), and a driven gear (224) that meshes with the drive gear (223) is fixedly connected to the spindle (222).

7. The elastic ring release device for a ligation device according to claim 6, characterized in that: The handle (1) is provided with a tension spring (6) for resetting the drive lever (221).

8. A release device for a ligation elastic ring according to claim 6, characterized in that: The limiting paddle (32) is slidably disposed in the handle (1). The handle (1) is provided with a contact spring (4) and an electromagnet (41). The contact spring (4) drives the limiting paddle (32) to maintain contact with the outer ratchet ring (31). When the electromagnet (41) is energized, it drives the limiting paddle (32) to slide away from the outer ratchet ring (31). The handle (1) is also provided with a control mechanism (5) for controlling the electromagnet (41) to turn on and off. When the lever (221) is pressed, the control mechanism (5) controls the electromagnet (41) to turn on. When the lever (221) is released, the control mechanism (5) controls the electromagnet (41) to turn off.

9. A release device for a ligation elastic ring according to claim 8, characterized in that: The drive gear (223) is rotatably mounted on the lever (221), and the rotation axis of the drive gear (223) coincides with the rotation axis of the lever (221). The control mechanism (5) includes a fixed block (51) fixedly connected to the lever (221) and a movable plate (52) fixedly connected to the drive gear (223). The movable plate (52) consists of two plates symmetrically arranged on both sides of the rotation axis of the lever (221). The fixed block (51) is located between the two movable plates (52). The fixed block (51) is provided with a stationary contact (54) facing the movable plate (52), and the movable plate (52) is provided with a moving contact (53) corresponding to the stationary contact (54).

10. A release device for a ligature elastic ring according to claim 9, characterized in that: The stationary contact (54) is electrically connected to a microcontroller. When the lever (221) rotates forward and backward, and the fixed block (51) and the movable plate (52) move relative to each other, causing the moving contact (53) to contact the stationary contact (54), an electrical signal is generated and input to the microcontroller. The microcontroller is configured to identify the rotation direction of the lever (221) based on the jogging electrical signal generated by the conduction of the moving contact (53) and the stationary contact (54) on different sides, and continuously control the electromagnet (41) to be energized or de-energized according to the rotation direction.

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