Hemostatic clip chuck assembly

Abstract

The invention relates to the technical field of hemostatic clips, in particular to a hemostatic clip chuck assembly which comprises a pull rod, a tightening pipe and a pair of split type clamping pieces. A bending part is arranged at the waist part of the split type clamping piece, a connecting plane is arranged at the tail part of the split type clamping piece, a through hole is formed in the connecting plane, and a fixer is arranged at the through hole; the fixer comprises a connecting ring and an elastic tooth sheet; a boss at the end part of the pull rod is inserted into the fixer, so that the pull rod is connected with the split type clamping piece; a buckle is arranged on the tightening pipe and used for locking the axial movement of the split type clamping piece. In order to solve the technical problem that a chuck part of an existing hemostatic clip is complex to assemble, through the design of the fixator, the split type clamping piece and the pull rod can be conveniently connected, and the assembling process of the pull rod and the clamping piece is simplified. And the rebound capability of the elastic tooth pieces on the fixer generates center homing on the movement of the pull rod, so that the guide effect on the pull rod is achieved in the assembling and using processes of the chuck assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of hemostatic clips, and particularly to a hemostatic clip head assembly. Background Art

[0002] A typical hemostatic clip system consists of two major parts: an operating mechanism and an applicator mechanism. According to mechanical structure differences, it can be divided into two major technical schools: chute-type hemostatic clips and elastomeric-strip-type hemostatic clips (the core components of both include: a clamping catheter, a clip assembly, a limiting mechanism, etc.). The clip assembly of the applicator generally adopts a double-lobe design, and its engineering dimensions need to be controlled with a minimum accuracy of 0.1 mm. At the same time, considering the limitations of the working channel of the endoscope used in cooperation, the parts are often assembled in a clamping catheter with an inner diameter of 2.0 ± 0.1 mm, and the spatial fitting accuracy of the multi-stage limiting structure is ensured.

[0003] For traditional hemostatic clips, especially their head parts, in order to meet the functions of clamping and releasing the head, there are many components constituting the head, and the assembly process is relatively complex and cumbersome. And based on the accuracy requirements of existing hemostatic clips, there are also many process difficulties in their assembly process. Some assembly scenarios require the assistance of optical magnification equipment, and the error and precision control are difficult. In short, the assembly of the traditional hemostatic clip head mainly depends on experienced technicians to complete with the assistance of special jigs, and the single-piece assembly takes a long time and the production efficiency is low. Summary of the Invention

[0004] Aiming at the technical problem of the complex assembly of the head part of the existing hemostatic clip, the present invention provides a hemostatic clip head assembly. Through the design of a fixator, the split clips and the pull rod can be conveniently connected, simplifying the assembly process of the pull rod and the clips. Moreover, the resilience of the elastic teeth on the fixator generates a central return for the movement of the pull rod, thus playing a guiding role for the pull rod during the assembly and use of the head assembly.

[0005] The technical solution provided by the present invention is as follows: A hemostatic clip chuck assembly, characterized by comprising a pull rod, a tightening tube, and a pair of split clips; a bending portion is provided at the waist of the split clips, and when the split clips are retracted into the tightening tube, the bending portion abuts against the inner wall of the tightening tube; a connecting plane is provided at the tail of the split clips, and the connecting planes located within the tightening tube are stacked, through holes are provided on the connecting plane, and a retainer is fixedly provided on at least one side of at least one of the through holes, and the retainer communicates with the through hole; the retainer includes a connecting ring, the inner diameter of the connecting ring is greater than or equal to the inner diameter of the through hole, a plurality of elastic teeth are fixedly provided on the inner circumferential direction of the connecting ring, the length of the elastic teeth is less than the radius of the connecting ring, and the ends of the elastic teeth all point to the center of the connecting ring, so that the ends of the elastic teeth form a hole-shaped gap; a boss is fixedly provided at the end of the pull rod, the diameter of the boss is greater than the passing dimension of the hole-shaped gap and less than the inner diameter of the connecting ring; the boss and the pull rod simultaneously pass through the through holes on each connecting plane and the corresponding hole-shaped gaps, and the ends of the elastic teeth abut against the pull rod, so that the pull rod is connected to the split clips; a buckle is provided on the tightening tube, and the buckle is used to lock the axial movement of the split clips.

[0006] Optionally, the width of the elastic teeth gradually decreases from the edge of the connecting ring towards the center of the connecting ring.

[0007] Optionally, a quick-installation groove is provided on the connecting plane, and the connecting ring is fitted into the quick-installation groove.

[0008] Optionally, a connecting pin is provided between the split clips, and the connecting pin is located at a position close to the tail of the split clips.

[0009] Optionally, the buckle extends towards the head of the tightening tube and inclines towards the center line of the tightening tube, the buckle is used for plugging into the retainer, and the buckle is used for abutting against the connecting pin.

[0010] Optionally, the buckle extends towards the tail of the tightening tube and inclines towards the center line of the tightening tube, and the buckle is used for abutting against the connecting pin.

[0011] Optionally, a blocking pin is provided on the tightening tube, and the blocking pin is located at a position on the tightening tube close to the head of the split clips.

[0012] Optionally, a conical portion is provided on the boss.

[0013] Optionally, the retainer is made of a metal material.

[0014] Optionally, the connecting ring of the fixator is integrally formed with the inner wall of the through hole.

[0015] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects: Aiming at the technical problem of the complex assembly of the clamping head part of the existing hemostatic clip, the present invention enables the split clamping piece and the pull rod to be conveniently connected through the design of the fixator, thereby conveniently realizing the assembly of the clamping head part of the hemostatic clip.

[0016] Moreover, the resilience of the elastic tooth piece on the fixator causes central return of the movement of the pull rod, thereby playing a guiding role for the pull rod during the assembly and actual use of the clamping head assembly.

[0017] In addition, the split clamping piece has an elastic force for outward expansion. Relying on this elastic force, mechanical self-locking can be formed between the pull rod and the split clamping piece when they are connected, thereby further ensuring the stability during connection. At the same time, this elastic force can ensure mechanical self-locking between the split clamping piece and the tightening tube after the split clamping piece is separated from the pull rod, ensuring the clamping effect of the clamping head assembly. Description of the Drawings

[0018] Figure 1 It is one of the schematic structural diagrams of the clamping head assembly of the hemostatic clip proposed by the embodiment of the present invention.

[0019] Figure 2 It is Figure 1 The enlarged schematic diagram at A in

[0020] Figure 3 It is the schematic structural diagram of the fixator proposed by the embodiment of the present invention.

[0021] Figure 4 It is the assembly schematic diagram of the split clamping piece and the fixator proposed by the embodiment of the present invention.

[0022] Figure 5 It is this Figure 1 The working process schematic diagram of the clamping head assembly of the hemostatic clip proposed by the embodiment.

[0023] Figure 6 It is this Figure 1 The assembly process schematic diagram of the clamping head assembly of the hemostatic clip proposed by the embodiment.

[0024] Figure 7 It is the second schematic structural diagram of the clamping head assembly of the hemostatic clip proposed by the embodiment of the present invention.

[0025] Figure 8 It is this Figure 7 The working process schematic diagram of the clamping head assembly of the hemostatic clip proposed by the embodiment.

[0026] Figure 9This is the third schematic diagram of the structure of the hemostatic clip head assembly proposed in the embodiment of the present invention.

[0027] Figure 10 It is Figure 9 an enlarged schematic diagram of part B in

[0028] Figure 11 This is the schematic diagram of the structure of the pull rod proposed in the embodiment of the present invention. Specific embodiments

[0029] To further understand the content of the present invention, the present invention will be described in detail with reference to the accompanying drawings and embodiments.

[0030] The following further details the present application with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the related invention and not for limiting the invention. In addition, it should be noted that for the sake of description, only parts related to the invention are shown in the drawings. The terms "first", "second", etc. in the present invention are set for the convenience of describing the technical solution of the present invention and have no specific limiting effect, and are all general references and do not constitute a limiting effect on the technical solution of the present invention. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions without contradiction or conflict, and are all within the scope of protection required by the present invention.

[0031] Embodiment 1

[0032] Combined with the attached Figure 1 to the attached Figure 8 , this embodiment proposes a hemostatic clip head assembly, including a pull rod 1, a tightening tube 2, and a pair of split clip pieces 3.

[0033] Among them, the split clip 3 is generally made of metal material, and its head is provided with clamping teeth. The waist of the split clip 3 is provided with a bending portion 30. The design of the bending portion 30 enables the split clip 3 to have a certain elasticity. When assembled with the tightening tube 2, it shows a tendency to expand outwards, that is, the split clips 3 on both sides have a tendency to open. Based on the design of the bending portion 30, when the split clip 3 is completely retracted into the tightening tube 2, the bending portion 30 will be in close contact with the inner wall of the tightening tube 2.

[0034] The tail of the split clip 3 is provided with a connecting plane 31. The connecting plane 31 can be formed by bending the tail of the split clip 3, or can be fixedly connected to the tail of the clip in forms such as bonding and welding. The connecting planes 31 located inside the tightening tube 2 are stacked, and through holes are provided on the connecting plane 31. At least one fixing device 4 is fixedly provided on at least one side of at least one through hole, and the fixing device 4 communicates with the through hole.

[0035] Generally, one fixing device 4 is fixedly provided on one connecting plane 31 by bonding or welding, but the specific quantity and setting form can be adjusted according to actual situations. In this embodiment, as shown in the appendix Figure 2 As shown, one fixing device 4 is respectively provided at the tails of the two split clips 3, and the fixing devices 4 are respectively arranged on different sides of the two connecting planes 31 and are far away from each other.

[0036] In this embodiment, the fixing device 4 includes a connecting ring 40. The inner diameter of the connecting ring 40 is greater than or equal to the inner diameter of the through hole. A plurality of elastic tooth pieces 41 are fixedly provided on the inner circumferential direction of the connecting ring 40. The length of the elastic tooth pieces 41 is less than the radius of the connecting ring 40, and the ends of the elastic tooth pieces 41 all point to the center of the connecting ring 40, so that the ends of the elastic tooth pieces 41 form a hole-shaped gap 410. The fixing device 4 and the split clip 3 can be of an integral structure or independent structures. This embodiment takes the form of independent parts as shown in the appendix Figure 1 and the appendix Figure 2 as an example.

[0037] A boss 10 is fixedly provided at the end of the pull rod 1. The diameter of the boss 10 is greater than the passing size of the hole-shaped gap 410 and less than the inner diameter of the connecting ring 40; the boss 10 and the pull rod 1 pass through the through holes on each connecting plane 31 and the corresponding hole-shaped gap 410 at the same time, and the ends of the elastic tooth pieces 41 are in contact with the pull rod 1, so that the pull rod 1 is connected to the split clip 3. A buckle 7 is also provided on the tightening tube 2, and the buckle 7 is used to lock the axial movement of the split clip 3.

[0038] In this embodiment, the fixator 4 is generally made of a metal material, specifically a metal material with a certain elasticity but a lower hardness compared to the split clip 3, such as C17200 beryllium copper (elastic modulus 128 GPa, HV 280 - 320), 304 stainless steel (specially annealed, HV 180 - 200), etc.

[0039] On the inner side of the connecting ring 40, several elastic teeth 41 pointing towards the center of the circle are provided. Based on the material and structural form of the elastic teeth 41, the elastic teeth 41 have good elasticity. In this embodiment, the diameter of the boss 10 at the end of the pull rod 1 is smaller than the inner diameter of the connecting ring 40 and larger than the hole-like gap 410 formed by the ends of the elastic teeth 41, so that during the process of the pull rod 1 (including the boss 10) passing through the hole-like gap 410, the elastic teeth 41 can deform in accordance with the movement direction of the pull rod 1. Thus, the split clip 3 can be conveniently and quickly connected to the pull rod 1 by inserting the fixator 4. Also, this form of cooperation between the elastic teeth 41 and the pull rod 1 can also ensure that the pull rod 1 and the split clip 3 can be conveniently separated during the surgical operation.

[0040] In addition, in a preferred embodiment, a conical portion 101 is provided on the boss 10. The conical portion 101 can be a conical or arc-shaped chamfered surface at the end of the boss 10. This design can ensure that the process of inserting the pull rod 1 into the fixator 4 is smoother, thereby further improving the convenience of assembly.

[0041] In this embodiment, relying on the resilience of the uniformly arranged elastic teeth 41 on the fixator 4, the central return of the movement of the pull rod 1 can be generated, compensating for the initial position deviation of the pull rod 1, that is, the fixator 4 can play a guiding and pre-fixing role on the pull rod 1 through the elastic teeth 41. This guiding effect is also effective during the normal operation of the hemostatic clip. During the normal operation of the hemostatic clip, especially during the process of the split clip 3 clamping and separating from the pull rod 1, the fixator 4 can also play a limiting and guiding role on the pull rod 1.

[0042] Since the pull rod 1 and the fixator 4 can be assembled only by insertion, this embodiment greatly simplifies the installation process of the chuck assembly and improves the production efficiency. And compared with the traditional form of relying on tooling for assembly, the component damage rate is also greatly reduced.

[0043] Obviously, in this embodiment, the number of the elastic teeth 41 and the hole-like gap 410 formed by their ends can be adjusted according to the actual situation. In the embodiment shown, the design of 6 elastic teeth 41 is adopted, while in other embodiments, the number of the elastic teeth 41 can be set more or less, and the hole-like gap 410 can also be set larger or smaller according to the dimensions of parts such as the pull rod 1 or specific usage requirements. Figure 3 In the embodiment shown, the design of 6 elastic teeth 41 is adopted, while in other embodiments, the number of the elastic teeth 41 can be set more or less, and the hole-like gap 410 can also be set larger or smaller according to the dimensions of parts such as the pull rod 1 or specific usage requirements.

[0044] In a preferred embodiment, the width of the elastic tooth piece 41 gradually decreases from the edge of the connecting ring 40 towards the center of the connecting ring 40. This design structurally enables the elastic tooth piece 41 to form a non-linear stiffness design, which is more conducive to adapting to the assembly of the pull rod 1 and the fixator 4, and can better adapt to the process from when the split clip 3 clamps to the separation of the pull rod 1 during the normal operation of the hemostatic clip.

[0045] As shown in the Figure 4 accompanying drawings, since the fixator 4 and the split clip 3 are independent structures in this embodiment, to further improve the convenience of the assembly between the fixator 4 and the split clip 3, a quick-installation groove 8 can be provided at the tail of the split clip 3, and the outer diameter of the quick-installation groove 8 can be slightly larger than the outer diameter of the connecting ring 40. Thus, the connecting ring 40 of the fixator 4 can be conveniently fitted into the quick-installation groove 8, thereby ensuring that the fixator 4 and the split clip 3 can be quickly positioned and assembled during assembly.

[0046] In this embodiment, a connecting pin 6 is further provided between the split clips 3. The connecting pin 6 is located at a position close to the tail of the split clips 3. The setting of the connecting pin 6 can play a role in stabilizing the split clips 3 on both sides, preventing the split clips 3 on both sides from being misaligned or twisted.

[0047] The split clip 3 in this embodiment has an elastic force that expands outwards. Relying on this elastic force, the pull rod 1 and the split clip 3 can form a mechanical self-locking with each other when connected, thereby further ensuring the stability during connection. At the same time, this elastic force can ensure that a mechanical self-locking is formed between the split clip 3 and the tightening tube 2 after the split clip 3 is separated from the pull rod 1, ensuring the clamping effect of the chuck assembly.

[0048] Specifically, the movement principle for achieving the above effects by relying on the elastic force is as follows: As shown in the Figure 1 and Figure 2 accompanying drawings, when the split clip 3 is in the maximum open state, due to the lever effect, the free ends (or distal ends, i.e., the ends where the clamping teeth are located) of the split clips 3 on both sides form the maximum expansion angle, and the tails of the split clips 3 on both sides generate staggered forces on the pull rod 1, that is, a centripetal clamping force on the pull rod 1 is formed. This centripetal clamping force makes the rod body of the pull rod 1 form a surface contact with the inner wall of one side of the through hole on the split clip 3, forming a mechanical self-locking between the pull rod 1 and the tail of the split clip 3, ensuring the stable connection between the pull rod 1 and the split clip 3 and helping to prevent the pull rod 1 from falling off. In addition, this centripetal clamping force can also achieve automatic deviation correction when the pull rod 1 is connected to the through hole.

[0049] It can be understood that for this embodiment, due to the presence of the fixer 4, the centripetal clamping force is actually formed between the elastic tooth piece 41 and the pull rod 1. Combined with the above description, it can be seen that since the rebound ability of the elastic tooth piece 41 on the fixer 4 can produce a center return for the movement of the pull rod 1, the design form of this embodiment can further realize automatic correction when the pull rod 1 is connected to the split clips 3 on both sides.

[0050] Regarding the process from the split clip 3 closing to the split clip 3 and the pull rod 1 being dynamically unlocked: the operator pulls the pull rod 1 toward the operating end (or proximal end, i.e., the end away from the clamping teeth), and the boss 10 on the pull rod 1 does not break through the elastic tooth piece 41 of the retainer 4. At this time, the pull rod 1 can drive the split clips 3 on both sides to slide as a whole in the tightening tube 2 toward the operating end (proximal end). At this time, due to the constraint and friction formed by the inner wall of the tightening tube 2 and the curved portion 30, the free end of the split clip 3 is forced to close, and since the constraint always exists, the closed state is locked. Continue to pull the pull rod 1. Due to the existence of reaction forces such as friction, the continued movement of the split clip 3 will be restricted. The boss 10 at the head end of the pull rod 1 will gradually break through the critical state restricted by the elastic tooth piece 41, and the pull rod 1 will separate from the retainer 4 and the tail of the split clip 3 (as shown in the attached figure). Figure 5 Correspondingly, the free end of the split clip 3 will continue to close and bite, while its tail will tilt up due to the lever action and abut against the inner wall of the tightening tube 2, forming a self-locking.

[0051] The disengagement of the pull rod 1 from the elastic tooth piece 41 is accompanied by the deformation of the elastic tooth piece 41. It should be noted that as the pull rod 1 breaks through the critical state of the elastic tooth piece 41's restriction, the elastic tooth piece 41 gradually bends and deforms, and its restraint on the pull rod 1 gradually changes. For a single elastic tooth piece 41, a lever is formed between the pull rod 1 (boss 10) and the elastic tooth piece 41. Therefore, as the degree of deflection of the elastic tooth piece 41 increases, the contact position between the boss 10 and the elastic tooth piece 41 changes, thereby changing the lever arm, thereby weakening the restraint on the pull rod 1 and making it easier for the two to disengage. It is understandable that in order to achieve the disengagement of the elastic tooth pieces 41 from the pull rod 1, the relationship between the number of elastic tooth pieces 41, the magnitude of the elastic force, and the closing stroke of the split clamp 3 can be obtained through simulation experiments or actual tests based on the actual instrument specifications.

[0052] The buckle 7 of this embodiment is used to lock the axial movement of the split clip 3. The specific locking method is related to the setting form of the buckle 7. Figure 5Taking the situation shown as an example, the buckle 7 extends towards the head (i.e., the distal end) of the tightening tube 2 and is inclined towards the central axis direction of the tightening tube 2. The buckle 7 is used for plugging into the fixator 4 and for abutting against the connecting pin 6. The specific principle of the buckle 7 for locking the split clip 3 is as follows: The hemostatic clip generally further includes a sheath tube and a fixed base connected to the tightening tube 2. The pull rod 1 is generally pulled by a wire passing through the sheath tube. When the split clip 3 retracts into the tightening tube 2, the free ends of the split clip 3 are fully closed and clamped tightly, and when the pull rod 1 is completely separated from the split clip 3, the tail of the split clip 3 tilts due to the lever action and abuts against the inner wall of the tightening tube 2. At this time, the fixed base and the sheath tube are manipulated to push the tightening tube 2 towards the human tissue. When the clamping teeth part contacts the human tissue, the tightening tube 2 is gently pushed further, and by means of the reaction force provided by the human tissue, the split clips 3 on both sides are pushed towards the proximal end, so that the fixator 4 at the tail of the split clip 3 is plugged into the buckle 7. At this time, the resilience of the elastic teeth 41 on the fixator 4 will prevent the tail of the split clip 3 from disengaging from the buckle 7, thereby stably maintaining the clamping state of the split clip 3. At this time, the connecting pin 6 can also play a limiting role. As the split clip 3 continuously moves towards the proximal end, the connecting pin 6 will abut against the end of the buckle 7 facing the distal end, thereby preventing the split clip 3 from continuing to move towards the proximal end.

[0053] In addition to the above setting form of the buckle 7, another setting form of the buckle 7 is as shown in the appendix Figure 7 and the appendix Figure 8 shown. In this embodiment, the buckle 7 extends towards the tail (i.e., the proximal end) of the tightening tube 2 and is inclined towards the central axis direction of the tightening tube 2. The buckle 7 is used for abutting against the connecting pin 6. In this embodiment, the specific principle of the buckle 7 for locking the split clip 3 is as follows: The pull rod 1 is pulled to drive the split clips 3 on both sides to slide integrally in the tightening tube 2 towards the operating end (proximal end), so that the connecting pin 6 passes over the buckle 7. When passing over the buckle 7, since the resistance of the buckle 7 to the pin is the greatest, the pulling force of the boss 10 will also increase. At this time, synchronous detachment can occur between the boss 10 and the elastic teeth 41. After detachment, since the end of the buckle 7 will limit the connecting pin 6, the movement of the split clip 3 towards the distal end is restricted.

[0054] Similarly, in this form, in order to achieve the synchronous disengagement of the elastic teeth 41 and the pull rod 1, the relationship between the number of elastic teeth 41, the size of the elastic force, etc., and the closing stroke of the split clip 3 can be obtained according to the actual instrument specifications through simulation experiments or actual tests. In addition, a snap ring 9 can be fixedly set in the tightening tube 2 between the end of the buckle 7 and the proximal end of the tightening tube 2 to prevent the connecting pin 6 from continuing to move toward the proximal end. The force between the connecting pin 6 and the snap ring 9 can provide a reaction force for the disengagement between the fixer 4 and the pull rod 1, ensuring the disengagement of the pull rod 1 and the fixer 4. Of course, if the pull rod 1 and the fixer 4 have already been disengaged before the snap ring 9 abuts the connecting pin 6, the snap ring 9 can also abut the tail of the opened split clip 3, thereby limiting the proximal movement of the split clip 3.

[0055] Furthermore, in a preferred embodiment, a blocking pin 5 is provided on the tightening tube 2, located near the head of the split clip 3. This embodiment, through the design of the blocking pin 5, not only improves the torsional resistance of the tightening tube 2, but also effectively reduces the risk of axial displacement and radial deflection of the split clip 3. It will be appreciated that if the pull rod 1 and the retainer 4 do not disengage simultaneously with the retainer 4 passing over the buckle 7, the blocking pin 5 can still abut the head of the split clip 3 after closing, thereby ensuring the separation of the retainer 4 from the pull rod 1.

[0056] As attached Figure 6 As shown, taking the hemostatic clip assembly including the blocking pin 5 and the connecting pin 6 as an example, its assembly method is as follows: (1) Pre-positioning and installation of the clip: align the split clips 3 on both sides to the maximum open state, fix the two connectors on the corresponding connecting plane 31, and insert the connecting pin 6. (2) Linkage assembly of the pull rod 1: insert the pull rod 1 axially into the through hole of the two split clips 3. During the insertion process of the pull rod 1, it will collide with the elastic tooth piece 41 of the fixer 4 and push the tooth piece in the corresponding movement direction. Continue to insert the pull rod 1 until the boss 10 completely passes through the distal end of the fixer 4. Pay attention to keep the movement trajectory of the pull rod 1 coincident with the axis of the clip through hole. (3) Storage of the clip assembly: After the split clip 3 is pre-installed, the pre-installed assembly is introduced into the tightening tube 2 cavity along the proximal axial direction of the pull rod 1. During this process, special attention should be paid to maintaining the preset expansion angle of the split clip 3 to ensure that it is in a functional ready state. A special positioning fixture can be used to assist in installation. After assembly is complete, the blocking pin 5 of the corresponding diameter should be matched according to the instrument specifications and inserted into the corresponding hole using auxiliary equipment. The connection between the pull rod 1 and the fixator 4 can also be completed in step (3). This embodiment does not limit the specific order of steps and only provides a feasible assembly solution.

[0057] In addition, it should be noted that in the actual clinical scenario, when the split clip 3 is not fully closed or not fully retracted into the tightening tube 2, it is generally not necessary to excessively push the split clip 3 distally. Instead, it is more common to pull back the pull rod 1 to clamp the split clip 3. In this embodiment, the frictional force between the elastic tooth piece 41 and the pull rod 1 can already meet the requirements for the repeated opening and closing of the split clip 3. Alternatively, a pull rod 1 as shown in the attached Figure 11 can be used. A section of protrusion is provided on the rod body of the pull rod 1 to form a step, which can abut against the connecting ring 40 to meet the requirement of pushing the split clip 3 outward by the pull rod 1.

[0058] Embodiment 2

[0059] Combined with the attached Figure 9 and the attached Figure 10 , compared with the technical solution of Embodiment 1, a hemostatic clip head assembly of this embodiment can be improved as follows: The connecting ring 40 of the fixator 4 and the inner wall of the through hole are integrally formed. In this embodiment, when the fixator 4 and the tail of the split clip 3 are integrally formed, it can be specifically designed that the connecting ring 40 and the inner wall of the through hole are integrally formed. At this time, the elastic tooth piece 41 can be obtained by cutting the tail of the split clip 3, or by other conventional processing methods such as 3D printing. The working principle of this form is the same as that of Embodiment 1, and the setting methods of the blocking pin 5, the connecting pin 6, and the buckle 7 can also refer to the form of Embodiment 1, which will not be elaborated here.

[0060] It should be noted that this design form can further eliminate the assembly process between the fixator and the split clip, thus further simplifying the assembly process. Moreover, in this form, the material of the fixator must be the same as that of the split clip, or at least the same as the material of the tail of the split clip, and the conventional materials of the hemostatic clip can be used.

[0061] The present invention and its embodiments are schematically described above. This description is not restrictive, and only one of the embodiments of the present invention is shown in the drawings. The actual structure is not limited to this. Therefore, if those of ordinary skill in the art are inspired by it and design a structural manner and an embodiment similar to this technical solution without creative efforts without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A hemostatic clip head assembly, characterized in that, It includes a pull rod (1), a tightening tube (2) and a pair of split clips (3); A bending part (30) is provided at the waist of the split clip (3). When the split clip (3) is retracted into the tightening tube (2), the bending part (30) abuts against the inner wall of the tightening tube (2); A connecting plane (31) is provided at the tail of the split clip (3). The connecting planes (31) located in the tightening tube (2) are stacked. Through holes are provided on the connecting plane (31), and a fixture (4) is fixedly provided on at least one side of at least one of the through holes. The fixture (4) communicates with the through hole; The fixture (4) includes a connecting ring (40). The inner diameter of the connecting ring (40) is greater than or equal to the inner diameter of the through hole. A plurality of elastic teeth (41) are fixedly provided on the inner circumferential direction of the connecting ring (40). The length of the elastic teeth (41) is less than the radius of the connecting ring (40), and the ends of the elastic teeth (41) all point to the center of the connecting ring (40), so that the ends of the elastic teeth (41) form a hole-like gap (410); A boss (10) is fixedly provided at the end of the pull rod (1). The diameter of the boss (10) is greater than the passing dimension of the hole-like gap (410) and less than the inner diameter of the connecting ring (40); The boss (10) and the pull rod (1) simultaneously pass through the through holes on each connecting plane (31) and the corresponding hole-like gaps (410), and the ends of the elastic teeth (41) abut against the pull rod (1), so that the pull rod (1) is connected to the split clip (3); A buckle (7) is provided on the tightening tube (2). The buckle (7) is used to lock the axial movement of the split clip (3).

2. The hemostatic clip chuck assembly according to claim 1, wherein, The width of the elastic teeth (41) gradually decreases from the edge of the connecting ring (40) towards the center of the connecting ring (40).

3. The hemostatic clip head assembly according to claim 1, wherein A quick-installation groove (8) is provided on the connecting plane (31). The connecting ring (40) is fitted into the quick-installation groove (8).

4. The hemostatic clip head assembly according to claim 1, characterized in that, A connecting pin (6) is provided between the split clips (3). The connecting pin (6) is located at a position close to the tail of the split clip (3).

5. The hemostatic clip chuck assembly according to claim 4, characterized in that, The buckle (7) extends towards the head of the tightening tube (2) and inclines towards the center line of the tightening tube (2). The buckle (7) is used to be inserted into the fixture (4), and the buckle (7) is used to abut against the connecting pin (6).

6. The hemostatic clip head assembly according to claim 4, wherein, The buckle (7) extends towards the tail of the tightening tube (2) and inclines towards the center line of the tightening tube (2). The buckle (7) is used to abut against the connecting pin (6).

7. The hemostatic clip chuck assembly according to claim 1, wherein, A blocking pin (5) is provided on the tightening tube (2). The blocking pin (5) is located at a position on the tightening tube (2) close to the head of the split clip (3).

8. The hemostatic clip chuck assembly according to claim 1, characterized in that, A conical part (101) is provided on the boss (10).

9. The hemostatic clip chuck assembly according to claim 1, characterized in that, The fixture (4) is made of metal material.

10. The hemostatic clip chuck assembly according to claim 1, wherein, The connecting ring (40) of the fixture (4) is integrally formed with the inner wall of the through hole.

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