An endoscopic hemostatic clip

Abstract

This invention provides an endoscopic hemostatic clip, comprising a connecting tube, a retracting tube, a movable seat, a limiting rod, and two clamping pieces. The retracting tube is open at both ends, and the retracting tube and a spring tube are respectively connected to both ends of the connecting tube. The connecting tube can be disengaged from the retracting tube by a pulling force. The movable seat is connected to the distal end of a pull rope via the connecting rod and is movably disposed in the retracting tube. The movable seat is adapted to engage with the connecting tube in a stop-and-go engagement. The movable seat is provided with a transversely arranged connecting shaft. The limiting rod is installed at the distal opening of the retracting tube. Each of the two clamping pieces has an elastic arm and a clamping claw formed at the distal end of the elastic arm. The tail side of the elastic arm forms a connecting hole and an opening groove that penetrates the connecting hole and extends axially. The connecting shaft is embedded in the connecting hole of the two clamping pieces. The width of the opening groove is smaller than the inner diameter of the connecting hole. The tail side of the elastic arm is provided with a radially extending locking part.

Description

Technical Field

[0001] This invention relates to a hemostatic clip for endoscopy, specifically a hemostatic clip with a rapid release function. Background Technology

[0002] Endoscopic metal clip hemostasis is one of the more widely used hemostasis methods. Skilled application of metal clips in appropriate cases is crucial.

[0003] Clamping can effectively stop bleeding and prevent rebleeding, reduce adverse reactions, and greatly improve the safety and cure rate of endoscopic treatment for gastrointestinal bleeding. The hemostatic mechanism of metal hemostatic clips is the same as that of surgical vascular ligation or suturing. It is a physical-mechanical method that uses the mechanical force generated when the hemostatic clip closes to ligate the surrounding tissue and bleeding vessels, thereby closing the bleeding vessels and blocking blood flow to achieve hemostasis. It is suitable for hemostatic treatment of non-varicose active bleeding and lesions with visible vascular stumps.

[0004] In clinical medicine, gastrointestinal bleeding frequently occurs due to disease, accidental injury, and damage during treatment. Currently, commonly used hemostasis methods include injection and spraying of medications, high-frequency electrocoagulation, laser therapy, argon plasma ablation, and using hemostatic clips to close the bleeding site. Among these, using hemostatic clips to close the bleeding site has become the most effective and clinically valuable non-surgical treatment for gastrointestinal bleeding due to its minimal invasiveness, rapid hemostasis, low rebleeding rate, few complications, and definite efficacy. Hemostatic clips can also close mucosal injuries in the digestive tract to a certain extent, promoting wound healing, and can also close small fistulas in the digestive tract, avoiding open surgery.

[0005] Existing hemostatic clips have drawbacks such as being difficult to operate. They cannot be tested before use, and once closed, they cannot be reopened. If an operational error occurs, some clips will be discarded. Some have poor rotational performance; when adjusting the angle of the clip during operation, the connection structure between the clip and the control handle limits rotation, causing jamming and difficulty in adjustment. Furthermore, some clips present difficulties in separating from the control handle after closing and releasing. Summary of the Invention

[0006] This invention provides an endoscopic hemostatic clip, comprising a handle, a slidably connected grip to the handle, a push-pull rod extending through the handle, a spring tube connected to the handle, and a pull cord extending axially within the spring tube. The handle extends through the handle and is connected to the push-pull rod, and the push-pull rod is connected to the proximal end of the pull cord. The hemostatic clip further comprises:

[0007] Connecting pipe;

[0008] The inlet tube is open at both ends, and the inlet tube and the spring tube are respectively connected to both ends of the connecting tube. The connecting tube can be separated from the inlet tube by a pulling force.

[0009] A movable seat is connected to the distal end of a pull rope via a connecting rod. The movable seat is movably disposed in a take-up tube and is adapted to engage with the connecting tube in a stop-and-go engagement. The movable seat is provided with a transversely arranged connecting shaft.

[0010] A limiting rod is installed at the far end opening of the receiving tube;

[0011] Two clamping plates, each with an elastic arm and a gripper formed at the distal end of the elastic arm. The tail side of the elastic arm forms a connecting hole and an opening groove that communicates with the connecting hole and extends axially. A connecting shaft is fitted into the connecting hole of the two clamping plates. The width of the opening groove is smaller than the inner diameter of the connecting hole. The tail side of the elastic arm is provided with a radially extending locking part. The receiving tube is provided with a locking engagement part that limits the locking part. The radial width of the gripper is larger than the inner diameter of the distal opening of the receiving tube. The elastic arm is movably disposed in the receiving tube. The elastic arm moves in and out of the receiving tube to drive the two clamping plates to open and close freely and repeatedly. The extension length of the elastic arm allows the locking part to reach the locking engagement part of the receiving tube. The connecting shaft is dislodged from the opening groove by tensile force. The deformation of the opening groove thereby exceeds its elastic limit. The locking part and the locking engagement part are permanently locked.

[0012] In some embodiments, the elastic arm includes a main body section and a transition section. The main body section enters and exits the inlet tube to drive the opening and closing of two clamping plates. The transition section is connected between the main body section and the clamping jaws. The axial extension height of the main body section is H, the axial extension height of the transition section is L, and the setting height of the locking engagement part is S, where S is greater than H and equal to H+L.

[0013] In some embodiments, the elastic arm is provided with symmetrical locking blocks on the tail side, and the inlet tube forms symmetrically arranged locking slots axially corresponding to the locking blocks. The deformation of the opening slot is adapted to push the locking blocks to the locking slots.

[0014] In some embodiments, the movable seat corresponds to the axial upward position of the connecting tube, and when the movable seat moves to the far end of the connecting tube, it abuts against it. The retractable tube is a deformable tube, and the handle drives the connecting tube to detach from the retractable tube through the movable seat.

[0015] In some embodiments, the connecting tube includes a connector and an intermediate tube, the distal end of the spring tube is connected to the connector, the connector and the retracting tube are respectively limited to the outer wall of the intermediate tube, the proximal portion of the retracting tube is a deformable part, and the tension of the intermediate tube drives the inner diameter of the deformable part to expand so that it can be dislodged from the retracting tube.

[0016] In some embodiments, the intermediate tube includes an intermediate section and an upper variable diameter section and a lower variable diameter section forming both ends of the intermediate section. The cross-sectional area of ​​the variable diameter section and the lower variable diameter section is larger than that of the intermediate section. The connector and the receiving tube respectively cooperate with the upper variable diameter section and the lower variable diameter section for stopping.

[0017] In some embodiments, the wall of the receiving tube is provided with at least one slit that communicates with the proximal opening, and the lower diameter section moves closer to drive the slit to enlarge so that the intermediate tube can be dislodged from the receiving tube.

[0018] In some embodiments, the movable seat includes a left clamping plate and a right clamping plate disposed opposite to each other, a clamping cavity is formed between the left clamping plate and the right clamping plate, the connecting shaft is respectively connected to the left clamping plate and the right clamping plate, and the elastic arm tails of the two clamping pieces are clamped in the clamping cavity.

[0019] In some embodiments, the receiving tube has a step that mates with the intermediate tube stop, the upper and lower ends of the step being chamfered, and the lower reducing section has an upper stepped surface that mates with the chamfered stop; the outer diameter of the lower reducing section is smaller than the inner diameter of the connector so that the intermediate tube can be accommodated within the connector.

[0020] In some embodiments, the handle is provided with a rotating ring rotatably connected thereto.

[0021] The hemostatic clip provided by this invention, through the ingenious design of the clip and the retractable tube, allows for repeated opening and closing of the clip before locking. This means that doctors can repeatedly open and close the clip before clamping the tissue, performing multiple trial operations and freely adjusting the clamping position and angle, thus reducing the difficulty of using the hemostatic clip. Simultaneously, after clamping the tissue, the clip and retractable tube can be locked, the clip released, and a rapid closure operation performed. This solves the technical problems of existing hemostatic clips, which cannot be used for trial operations, cannot be reopened once closed, and require some clips to be discarded if an operational error occurs.

[0022] The hemostatic clip provided by this invention achieves rapid separation and release of the clip and the inlet tube through the combined design of the clip, the movable seat and the connecting tube. The whole operation is labor-saving and simple. The user only needs to control the moving hand to realize the free opening and closing of the clip and the release action. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the hemostatic clip provided by the present invention;

[0024] Figure 2 This is a structural disassembly diagram of the hemostatic clip provided by the present invention;

[0025] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0026] Figure 4 and Figure 5 A schematic diagram of the opening or closing structure of the clamp provided by the present invention; Figure 6 This is a schematic diagram of the structure of the clip provided by the present invention;

[0027] Figure 7 A schematic diagram of the receiving tube provided by the present invention;

[0028] Figure 9 This is a schematic diagram illustrating the working principle of the hemostatic clip provided by the present invention. Detailed Implementation

[0029] The present invention or its technical solutions will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings;

[0030] In the description of this invention, it should be understood that the terms "front", "back", "up", "down", "far", "near", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] In the description of this invention, it should be noted that, unless otherwise specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0032] Please see Figure 1-3 This invention provides an endoscopic hemostatic clip, which includes a handle 1, a slidably connected handle 2 on the handle 1, a push-pull rod 3 passing through the handle, a spring tube 5 connected to the handle 1, and a pull rope 6 extending axially within the spring tube 5. The handle 3 passes through the handle 1 and is connected to the push-pull rod 3, and the push-pull rod 3 is connected to the proximal end of the pull rope 6.

[0033] To achieve a hemostatic clip that can be repeatedly opened and closed before clamping tissue, and can be locked after clamping tissue, and is easily detachable from the handle, this embodiment of the hemostatic clip further includes a connecting tube 7, a retractable tube 8, a movable seat 81, a limiting rod 82, and two clamping pieces 9. The connecting tube 7 has a first end and a second end. The first end is connected to the distal end of the spring tube 5, and the second end is connected to the retractable tube. That is, the spring tube 5 and the retractable tube 8 are connected through the connecting tube 7. At the same time, in order to release the clamping pieces, the connecting tube can be disengaged from the retractable tube by pulling force, that is, the connecting tube can be separated from the retractable tube under the pulling force of the handle.

[0034] The take-up tube 8 has openings at both ends, including a proximal opening and a distal opening. The movable seat 81 is movably disposed inside the take-up tube 8 and is adapted to engage with the connecting tube 7 for a stop-and-hold action. The movable seat 81 is connected to the distal end of the pull rope 6 via a connecting rod 83, and a transversely arranged connecting shaft 85 is provided on the movable seat 81. The limiting rod 82 is installed at the distal opening of the take-up tube to limit the distance of displacement of the two clamping pieces 9.

[0035] Please see Figures 4-6 Both clamping plates 9 have elastic arms 91 and grippers 92 formed at the distal end of the elastic arms 91. The elastic arms are movably disposed in the receiving tube and are elastically deformed and housed in the receiving tube. The two grippers close in conjunction with each other. When the elastic arms are removed from the receiving tube, the grippers open in conjunction with each other. The opening or closing of the grippers is achieved by the closing of the elastic arms.

[0036] To enable the elastic arm 91 to move in and out of the receiving tube 8, a connecting hole 910 and an opening groove 911 extending axially through the connecting hole 910 are formed on the tail side of the elastic arm 91. The connecting shaft 85 passes through the connecting holes 910 of the two clamps. The elastic arm 91 moves in and out of the receiving tube 8 via the moving seat 81. The width of the opening groove 911 is smaller than the inner diameter of the connecting hole 910, and the radial width of the clamps is larger than the inner diameter of the distal opening of the receiving tube. Thus, when the handle is pulled, the clamps move closer and stop at the distal opening of the receiving tube. The increased pulling force of the handle can drive the connecting shaft 85 out of the connecting hole and the through opening groove 911. This step achieves the separation of the connecting shaft and the clamps.

[0037] Based on this, please refer to Figure 7 and Figure 8The elastic arm provided in this embodiment has a radially extending locking part 915 on its tail side, and the retracting tube 8 has a locking engagement part 800 that locks with the locking part. The extension length of the elastic arm 91 allows the locking part 915 to reach the position of the locking engagement part 800 of the retracting tube. As mentioned above, the connecting shaft is dislodged from the opening groove 911 by the tensile force. At this time, the opening groove is deformed by the opening action of the connecting shaft. The amount of deformation is greater than its elastic limit, that is, the opening groove 911 undergoes plastic deformation. In other words, the locking part 915 will not return to its original position. The locking part 915 and the locking engagement part 800 are permanently locked, that is, the retracting tube and the clamp are permanently locked.

[0038] Thus, handle 2 is connected to clamp 9 via push-pull rod 3, pull rope 6, connecting rod 83, and moving seat 81. The axial sliding of handle 2 relative to handle 1 drives the two clamps to open and close freely and repeatedly. The proximal side of the retractable tube 8 can lock with the two clamps after they are closed. That is, after the two clamps 9 have been opened and closed repeatedly to achieve the function of clamping tissue, if the handle is pulled further, the jaws will stop at the far end opening of the retractable tube, and the locking part will reach the position of the locking engagement part. At this time, by means of the elasticity of the elastic arm, pulling the handle will drive the connecting shaft from the connecting hole 910 into the opening groove 911 and out of the opening groove 911. The opening groove undergoes plastic deformation, and the radial expansion deformation of the opening groove will drive the locking part to be pushed to the locking engagement part, thereby locking the retractable tube and the clamps. Pulling the handle 2 further will drive the moving seat 81 to the position of abutting against the connecting tube 7 and finally drive the connecting tube 7 to separate from the retractable tube 8. The two clamps 9 have an active position connected to the movable seat 81 and a locked position locked to the take-up tube 8. When the two clamps are in the active position, the handle drives the two clamps to open or close. When the two clamps are in the locked position, the two clamps are permanently closed, and the handle drives the movable seat and the connecting tube to separate from the take-up tube.

[0039] Firstly, the hemostatic clip provided in this embodiment can be repeatedly tested before clamping the tissue, and can be repeatedly opened and closed freely. That is, doctors can repeatedly open and close the clip before clamping the tissue, and can freely adjust the clamping position and angle, reducing the difficulty of using the hemostatic clip. It solves the technical problem that existing hemostatic clips cannot be tested, cannot be opened again once closed, and some hemostatic clips will be directly discarded if there is an operational error.

[0040] Secondly, after the clip clamps the tissue, they can lock with the inlet tube. The separable design of the inlet tube and the connecting tube ultimately releases the hemostatic clip. The entire operation is labor-saving, convenient, and controllable, with no uncertainty.

[0041] Optionally, the handle 3 is fixedly connected to the push-pull rod 3 inside the handle 1 by screw 31, so that the movement of the handle 3 drives the push-pull rod 3 to move up and down inside the handle 1, and finally drives the clamp to open or close.

[0042] In this embodiment, the pull rope 6 is a torque wire, which enables both the traction of the connecting rod and the flexibility of the spring tube. By pushing or pulling the torque wire inside the spring tube with the push-pull handle, the two clamps on the retractable tube can be brought together or opened.

[0043] The limiting rod 82 is a pin connected to the far end of the receiving tube.

[0044] In order to allow for the human-controlled selection of the moving and locking positions of the clamping plates, the structure of the clamping plates was designed in detail to enable the clamping plates to open or close freely before reaching the locking position. For example, the length of the elastic arm needs to be sufficient to allow it to retract into the inlet tube after the clamping jaws are closed. In this way, the elastic arm can continue to move until it reaches the position where it locks into the inlet tube. Specifically, the elastic arm 91 includes a main body segment 912 and a transition segment 913. The main body segment 913 is provided with a locking part 915, and the receiving tube 8 is provided with a locking engagement part 800 that locks into the locking part 915. The main body segment 913 moves in and out of the receiving tube 8 to drive the opening and closing of the two clamping pieces 9. The transition segment 913 connects the main body segment 912 and the gripper. The reserved length of the transition segment 913 allows the locking part 915 to reach the locking engagement part 811. The axial extension height of the main body segment 912 is H, the axial extension height of the transition segment 913 is L, and the setting height of the latch 800 is S, where S is greater than H and less than or equal to H+L. Thus, the movement of the main body segment of the elastic arm 91 enables the clamping pieces to open and then close, while the setting of the transition segment allows the elastic arm to further retract until it locks into the latch of the receiving tube. In this embodiment, S = H+L.

[0045] In this embodiment, the elastic arm 91 is provided with left and right arranged locking blocks 915 corresponding to the deformation direction of the opening slot, and the receiving tube 8 forms a locking slot 800 axially corresponding to the position of the locking block. It can be understood that since there are two locking blocks, the receiving tube is provided with two symmetrical locking slots corresponding to the locking block 915.

[0046] In some preferred embodiments, the clip is an elastic metal sheet, and the tail side of the elastic arm is a straight section that defines a connecting hole and an opening slot. This allows the elastic arm to be telescopically mounted in the retractable tube, while also allowing for plastic deformation of the opening slot, ultimately achieving permanent locking of the locking part in the locking mating part.

[0047] As mentioned earlier, after the clamp 9 separates from the movable seat 81, the handle 2 continues to drive the movable seat 81 to retract. At this time, the backward pulling force of the movable seat 81 is needed to drive the separation of the connecting tube 7 and the retracting tube 8. In order to optimize the structure so that the handle, the movable seat and the connecting tube can achieve the separation function, in some preferred embodiments, the movable seat 81 and the connecting tube 7 are axially aligned. When the movable seat 7 moves to the far end of the connecting tube, it abuts against it. The retracting tube 8 is a deformable tube. The handle drives the connecting tube to detach from the retracting tube through the movable seat.

[0048] In some preferred embodiments, the connecting tube 7 includes a connector 71 and an intermediate tube 72. The distal end of the spring tube 5 is connected to the connector 71. The connector 71 and the retractable tube 8 are respectively fitted with the outer wall of the intermediate tube 72. The proximal portion of the retractable tube 8 is a deformable part. The tension of the intermediate tube 72 drives the inner diameter of the deformable part to expand so that it can be dislodged from the retractable tube 8. Specifically, the intermediate tube 72 includes an intermediate section 722 and an upper diameter-changing section 721 and a lower diameter-changing section 723 forming both ends of the intermediate section. The cross-sectional areas of the upper diameter-changing section 721 and the lower diameter-changing section 723 are larger than those of the intermediate section. Thus, a stepped surface is formed between the upper diameter-changing section 721 and the lower diameter-changing section 723 and the intermediate section 722, respectively. The connector and the retractable tube are respectively fitted with the upper diameter-changing section and the lower diameter-changing section, i.e., the connector and the retractable tube are respectively nested in the outer wall of the intermediate tube. Since the outer diameter of the lower diameter-changing section increases, the deformable retractable tube can be extruded by tension.

[0049] In some embodiments, the receiving tube 8 is made of an elastic material capable of elastic deformation, facilitating the insertion and removal of the intermediate tube. The tube wall has at least one slit 801 communicating with the proximal opening. As the lower diameter section 723 moves closer, it exerts pressure on the slit, causing it to widen. The intermediate tube 72 then disengages from the receiving tube 8. Pulling the handle actuates the moving seat, which then forces the intermediate tube out of the expandable receiving tube. To further facilitate rapid disengagement of the intermediate tube, the receiving tube has a step 802 that engages with the stop of the intermediate section 722. Both the upper and lower ends of this step are chamfered. The chamfered step facilitates the instantaneous and rapid disengagement of the intermediate tube, reducing the resistance when pulling the handle out of the intermediate tube.

[0050] More preferably, the outer diameter of the lower diameter section 723 is smaller than that of the endoscope in the connector 71 so that the intermediate tube 72 can be completely housed in the connector 71.

[0051] Optionally, the movable seat 81 includes a left clamping plate and a right clamping plate arranged opposite to each other, forming a clamping cavity between the left clamping plate and the right clamping plate, and the connecting shaft 85 is respectively connected to the left clamping plate and the right clamping plate. The elastic arm tails of the two clamping pieces are clamped in the clamping cavity, realizing the stable connection and release of the clamping pieces on the movable seat.

[0052] In some embodiments, the main body segment 912 includes a straight segment 9121 located on the tail side and an arcuate segment 9123. The straight segment extends radially in the direction corresponding to the opening slot to form two symmetrical tail wings to constitute the limiting block. The straight segment 9121 defines the connecting hole and the opening slot. The tail wings constitute the aforementioned locking block 915, which engages with the two symmetrical locking slots of the retracting tube.

[0053] In this embodiment, the handle is provided with a rotating ring 10 that is rotatably connected to it. Holding the rotating ring keeps it stationary, and rotating the handle can realize the circumferential rotation of the hemostatic clip. The handle and the rotating ring can rotate relative to each other. By rotating the handle, the torque can be transmitted to the two clips in the hemostatic clip assembly through the torque wire, so as to realize the smooth and flexible rotation of the clip head.

[0054] In some embodiments, the main body segment 912 is an arc-shaped concave surface that protrudes from the limiting rod, and the transition segment 913 is an arc-shaped convex surface to increase the opening angle of the gripper.

[0055] Optionally, the gripper includes a gripper portion and side wings 921 formed on both sides of the gripper portion. The side wings 921 and the transition section are limited by a step 922. The step 922 is engaged with the stop at the far end opening of the inlet tube, so that the gripper cannot continue to move into the inlet tube.

[0056] In this embodiment, a pin hole 821 is provided on the far side of the receiving tube to install a horizontally arranged pin, which is used as a limiting rod 82.

[0057] The proximal end of the spring tube is connected to the inside of the handle 1 through the limiting tube 51, and the spring tube is provided with a protective tube 52 after passing through the rotating ring.

[0058] For example, please refer to Figure 9 This embodiment provides a working process of a hemostatic clip:

[0059] Step 1: Push or pull the handle to move the main body of the clamp into or out of the inlet tube, thereby closing or opening the clamp. The clamp is in the movable position at this time, and multiple trial operations can be performed to finally clamp the target tissue.

[0060] Step 2: After the function of clamping the tissue is completed, continue to pull the handle. When the tail wing of the clamping plate reaches the position of the inlet tube, the jaws will stop at the outside of the far end opening of the inlet tube, that is, the jaws cannot continue to move.

[0061] Step 3: Continue to apply pulling force to the handle. Since the clamp cannot continue to move to the near side, the connecting shaft continues to move downward under the action of the pulling force, which opens the clamp opening slot. The two tail wings of the clamp are pushed into the tube bayonet. The opening slot undergoes plastic deformation. The tail wing position is constant. The clamp is stuck and can no longer move upward. That is, the clamp is locked and the clamp is permanently closed.

[0062] Step 4: Continue to apply pulling force to the handle. The connecting rod moves with the connecting shaft, and the middle tube will be pushed out from the retracting tube and enter the connector. The clamp and handle are separated, and the hemostatic clamp is released.

[0063] The hemostatic clip provided by this invention, through the ingenious design of the clip and the retractable tube, allows for repeated opening and closing of the clip before locking. This means that doctors can repeatedly open and close the clip before clamping the tissue, performing multiple routine operations, and freely adjust the clamping position and angle, reducing the difficulty of using the hemostatic clip. Simultaneously, after clamping the tissue, the clip and retractable tube can be locked, the clip released, and a rapid closure operation performed. This solves the technical problems of existing hemostatic clips, which cannot be used for trial operations, cannot be reopened once closed, and require some clips to be discarded if an operational error occurs.

[0064] The inlet tube and clamp provided by this invention are both elastic structures, so there will be no problem of jamming or difficulty in separation after release. This enables rapid separation and release of the clamp and inlet tube. The entire operation is labor-saving and simple; the user only needs to control the movement of their hand to achieve the free opening and closing of the clamp and the release action.

[0065] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An endoscopic hemostatic clip comprising a handle, a handle knob slidably connected to the handle, a push-pull rod disposed through the handle, a spring tube connected to the handle, a pull cord extending axially in the spring tube, the handle knob being connected to the push-pull rod through the handle, and the push-pull rod being connected to a proximal end of the pull cord, characterized in that, the handle knob is provided with a plurality of teeth, the push-pull rod is provided with a plurality of teeth, and the teeth of the handle knob and the teeth of the push-pull rod are in engagement with each other. The hemostatic clamp further comprises: a connecting pipe; a retraction pipe, which is open at both ends, and is connected with the connecting pipe at both ends respectively, the connecting pipe can be separated from the retraction pipe by pulling force; a moving seat, which is connected with the far end of the pull rope through a connecting rod, and is movably arranged in the retraction pipe, the moving seat is adapted to abut with the connecting pipe, and a connecting shaft is arranged on the moving seat in transverse direction; a limiting rod, which is installed at the far end opening of the retraction pipe; two clamping pieces, each of which has an elastic arm and a clamping jaw formed at the far end of the elastic arm, a connecting hole and an open slot extending in axial direction are formed at the tail side of the elastic arm, the connecting shaft is embedded in the connecting holes of the two clamping pieces, the width of the open slot is smaller than the inner diameter of the connecting hole, a locking part extending in radial direction is arranged at the tail side of the elastic arm, the retraction pipe is provided with a locking matching part limiting matched with the locking part, the radial width of the clamping jaw is larger than the inner diameter of the far end opening of the retraction pipe, the elastic arm is movably arranged in the retraction pipe, the elastic arm moves in and out of the retraction pipe to drive the two clamping pieces to open and close repeatedly, and the extension length of the elastic arm allows the locking part to reach the position of the locking matching part of the retraction pipe, the connecting shaft is separated from the open slot under the action of pulling force, the deformation of the open slot is larger than the elastic limit of the open slot, and the locking part and the locking matching part are permanently locked; the moving seat is corresponding to the axial position of the connecting pipe, and the moving seat abuts with the connecting pipe when the moving seat moves to the far end of the connecting pipe, the retraction pipe is a deformable pipe, and the handle drives the connecting pipe to separate from the retraction pipe through the moving seat; the tail side of the elastic arm is provided with left and right symmetrical clamping blocks, the retraction pipe is formed with symmetrically arranged clamping openings corresponding to the positions of the clamping blocks, and the deformation of the open slot is adapted to push the clamping blocks to the clamping openings.

2. The hemostatic clip of claim 1, wherein The elastic arm comprises a main body segment and a transition segment, the main body segment moves in and out of the retraction pipe to drive the two clamping pieces to open and close, the transition segment is connected between the main body segment and the clamping jaw, the axial extension height of the main body segment is H, the axial extension height of the transition segment is L, and the setting height of the locking matching part is S, S is greater than H and equal to H+L.

3. The hemostatic clip of claim 1, wherein, The connecting pipe comprises a connecting head and an intermediate pipe, the far end of the spring pipe is connected with the connecting head, the connecting head and the retraction pipe are respectively limited matched with the outer wall of the intermediate pipe, and the proximal part of the retraction pipe is a deformable part, the pulling force of the intermediate pipe drives the inner diameter of the deformable part to expand to make it separate from the retraction pipe.

4. The hemostatic clip of claim 3, wherein, The intermediate pipe comprises an intermediate segment and upper and lower variable diameter segments formed at both ends of the intermediate segment, the cross-sectional areas of the variable diameter segments and the lower variable diameter segment are larger than that of the intermediate segment, and the connecting head and the retraction pipe are respectively stop matched with the upper and lower variable diameter segments.

5. The hemostatic clip of claim 3, wherein, At least one slit is arranged on the pipe wall of the retraction pipe and penetrates the proximal end opening, and the lower variable diameter segment moves to the proximal end to drive the slit to expand to make the intermediate pipe separate from the retraction pipe.

6. The hemostatic clip of claim 4, wherein, The moving seat comprises oppositely arranged left and right clamping plates, a clamping cavity is formed between the left and right clamping plates, the connecting shaft is connected with the left and right clamping plates respectively, and the tail sides of the elastic arms of the two clamping pieces are clamped in the clamping cavity.

7. The hemostatic clip of claim 5, wherein, The said inlet pipe has a step matched with the intermediate pipe stop, the upper end and lower end of the step are chamfered, the said lower reducing section has an upper step surface matched with the chamfered stop; the outer diameter of the said lower reducing section is smaller than the inner diameter of the connector so that the intermediate pipe can be accommodated in the connector.

8. The hemostatic clip of any one of claims 1 to 6, wherein the clip is made of a material selected from the group consisting of stainless steel, titanium, cobalt-chrome, and combinations thereof. The handle is provided with a rotating ring connected with the handle.

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