A closure clip provided with an easily breakable elastic bend

Abstract

This invention relates to the field of medical devices, specifically to a closure clip with an easily shearable elastic bend. The closure clip includes a clamping portion and an elastic bend connecting the clamping portion. The elastic bend has a protruding angle protruding inwards or outwards at its middle or corner position. A crack is located in the middle of the protruding angle, extending a certain depth from the side of the elastic bend or the end face of the protruding angle towards the opposite side, but not penetrating through it. When the crack is squeezed open by a wedge-shaped wedge, the crack continues to extend towards the opposite side until the elastic bend and the protruding angle completely break.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a closure clip. Background Technology

[0002] Endoscopic cap-type closure clips are commonly used endoscopic hemostatic closure instruments in clinical practice. Due to their strong tissue clamping force and larger clamping range, they play an unparalleled role in treating clinically refractory gastrointestinal bleeding and gastrointestinal fistulas. However, their strong clamping force and large clamping range also make them difficult to dislodge once clamped, potentially leading to luminal obstruction or dysphagia, thus requiring removal. Internationally, closure clips are removed using a specialized cutting electrode catheter. Based on the principle of resistance welding, the high-temperature arc generated by the instantaneous high current between the electrodes melts the elastic bend of the closure clip. However, this device is complex and expensive, and the high temperature generated by the electrode catheter during discharge may cause thermal damage to surrounding tissues. Domestically, closure clips are removed using a detachable design. Two interlocking clips are bound together with metal wire to form a closure clip. Disassembly only requires removing the binding wire. While this wire binding structure simplifies removal, it complicates the manufacturing process, increasing product cost. In view of the shortcomings of existing technical solutions, this invention proposes a closure clip with a simple structure that can be easily cut by physical means. By referring to the design concept of easy-tear openings on food packaging bags and the life scenario of splitting firewood with an axe, cracks are specially set in special parts of the closure clip, so that the closure clip has the characteristic of being easy to "split" open, thereby solving the various shortcomings of existing products. Summary of the Invention

[0003] The objective of this invention is mainly achieved through the following technical solutions:

[0004] A closed clamp with an easily shearable elastic bend is characterized by comprising clamping portions that are relatively distributed or centrally symmetrically distributed. Multiple clamping portions are connected to form a closed-loop structure by elastic bends extending from both sides. Each elastic bend has a protruding angle, and a crack is located in the middle of the protruding angle. The crack extends to a certain depth from the end face of the protruding angle or the side of the elastic bend towards the opposite side, but does not penetrate through it. When the crack is squeezed open by a wedge-shaped wedge, the crack continues to extend towards the opposite side until the elastic bend and the protruding angle completely break.

[0005] Preferably, the clamping part is provided with wavy or pointed teeth.

[0006] Preferably, the elastic bend extends from the shoulder of one clamping portion to the shoulder of the adjacent clamping portion.

[0007] Preferably, the elastic bend is a convex bend, and the protruding angle is located at the middle position of the elastic bend.

[0008] Preferably, the elastic bend is a concave bend with a corner, and the protruding angle is located at the corner of the elastic bend.

[0009] Preferably, the root of the elastic bend and the clamping part are connected by a rounded corner transition.

[0010] Preferably, the protrusion angle protrudes towards the inside or outside of the elastic bend.

[0011] Preferably, the width of the protrusion angle is greater than the width of the elastic bend.

[0012] Preferably, the protruding corner has a rectangular structure.

[0013] Preferably, the color of the protruding angle is different from the color of the elastic bend.

[0014] Preferably, the elastic bend is warped relative to the clamping portion.

[0015] Preferably, the crack does not extend into the tensile stress region of the elastic bend.

[0016] Preferably, the entrance to the crack is provided with a chamfered bevel.

[0017] Preferably, the chamfered bevel at the crack entrance is a rounded bevel or a slanted bevel.

[0018] Preferably, the closing clamp is made of a superelastic nickel-titanium alloy.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The elastic bend of the closure clamp of this invention can be sheared within the component. According to the principles of fracture mechanics, the presence of cracks significantly reduces the fracture strength of a component. By providing a protruding angle on the elastic bend of the closure clamp and a crack in the middle of the protruding angle, not only is it ensured that the elastic bend continuously provides a strong clamping force for the closure clamp, but it also creates a structural vulnerability in the elastic bend. When the crack is not subjected to wedge-shaped wedge compression, the crack will not continue to extend; when the crack is subjected to wedge-shaped wedge compression, the crack tip easily generates concentrated tensile stress exceeding the tensile strength of the nickel-titanium alloy, causing the crack to continue extending to the opposite side even under a relatively small compressive force, leading to the fracture of the protruding angle and the elastic bend. Shearing the elastic bend and protruding angle of the closure clamp within the component eliminates its clamping force, allowing it to be removed.

[0021] The closure clip of this invention has a simple manufacturing process and stable performance. Compared with other one-piece closure clips on the market, the closure clip of this invention can pre-cut the protrusions and protrusion cracks during blank processing, without increasing raw material costs. Compared with existing wire-bound closure clips on the market, the closure clip of this invention can reduce the binding process, making the manufacturing process simpler and reducing manufacturing costs. Therefore, because the closure clip is not affected by the binding process, its performance is more stable.

[0022] The closure clip of this invention does not generate high temperatures or significant tensile forces when cut, resulting in minimal tissue damage. Commercially available closure clips bound with metal wires can transmit tensile forces to the tissue during disassembly, easily causing secondary tissue damage. The closure clip of this invention applies a compressive force only to the protruding corner crack when cut, while other parts are not subjected to significant tensile forces, thus causing less tissue damage. Compared to techniques that use high-temperature electric arcs to melt and break elastic bends in metal, the closure clip of this invention does not generate high temperatures when cut, therefore preventing thermal damage to surrounding tissues.

[0023] Other features and advantages of the present invention can be understood and obtained through the detailed embodiments and accompanying drawings. Attached Figure Description

[0024] Figures 1a-1e This is a schematic diagram of the closing clip according to Embodiment 1 of the present invention, wherein... Figure 1a This is a schematic diagram of the closed clamp in the clamped state. Figure 1b This is a picture of the actual closed clamp. Figure 1c This is a schematic diagram of the force analysis of a closed clamp in its open state. Figure 1d This is a schematic diagram of a closed clamp being cut by shearing pliers. Figure 1e This is a schematic diagram of the structure after the closed clamp has been cut.

[0025] Figures 2a-2e This is a schematic diagram of the closing clip according to Embodiment 2 of the present invention, wherein... Figure 2a This is a schematic diagram of the closed clamp in the clamped state. Figure 2b This is a schematic diagram of the force analysis of a closed clamp in its open state. Figure 2c This is a schematic diagram of a closed clamp being cut by shearing pliers. Figure 2d This is a schematic diagram of the closed clamp structure after it has been cut. Figure 2e The image shows the closed clip before and after it was cut.

[0026] Figures 3a-3e This is a schematic diagram of the closing clip according to Embodiment 3 of the present invention, wherein... Figure 3a This is a schematic diagram of the closed clamp in the clamped state. Figure 3b This is a schematic diagram of the force analysis when the closed clamp is open. Figure 3c This is a schematic diagram of a closed clamp being cut by shearing pliers. Figure 3d The images show actual cutting pliers and a closing clamp. Figure 3e This is a schematic diagram of the closed clamp after it has been cut.

[0027] Figures 4a-4e This is a schematic diagram of the closing clip according to Embodiment 4 of the present invention, wherein... Figure 4a This is a schematic diagram of the structure in the closed clamping state. Figure 4b A photograph of a closed clamp that has been expanded. Figure 4c This is a schematic diagram of the force analysis of a closed clamp in its open state. Figure 4d This is a schematic diagram of a closed clamp being cut by shearing pliers. Figure 4e This is a picture of the closed clip after it has been cut.

[0028] Figures 5a-5e This is a schematic diagram of the closing clip according to Embodiment 5 of the present invention, wherein... Figure 5a This is a schematic diagram of the closed clamp in the clamped state. Figure 5b A photograph of a closed clamp that has been expanded. Figure 5c This is a schematic diagram of the force analysis of a closed clamp in its open state. Figure 5d This is a diagram illustrating the closing clamp being cut by cutting pliers. Figure 5e The image shows the closed clip before and after it was cut.

[0029] Explanation of reference numerals in the attached diagram: 11-elastic bend; 12-protruding angle; 13-protruding angle crack; 14-clamping part; 15-clamping part teeth; 21-wedge-shaped wedge of cutting pliers; 22-hooked arm of cutting pliers. Detailed Implementation

[0030] The technical solution of the present invention will be described in detail below with reference to specific embodiments and accompanying drawings. The specific embodiments described below are only used to illustrate the present invention and are not intended to limit the present invention. The accompanying drawings constitute a part of the present invention, and irrelevant or unimportant details are not fully drawn in order to achieve simplicity.

[0031] The term “side surface” as used in this application refers to the profile side surface in the width direction, which is divided into inner side surface and outer side surface. “Inner side” refers to the area inside the inner side surface, “outer side” refers to the area outside the outer side surface, “end face” refers to the terminating face in the extension direction, and “multiple” means that the number is greater than or equal to two.

[0032] The description of the relevant structures mentioned in this application is only for the convenience of understanding the present invention. The specific features do not limit the scope of the present invention. Conventional selections and substitutions made by those skilled in the art under the guidance of the inventive concept should be regarded as being within the scope of protection claimed by the present invention.

[0033] Example 1

[0034] Figures 1a-1e A first embodiment of the closing clip of the present invention is shown. For example... Figure 1a As shown, the closing clamp has four symmetrically distributed elliptical clamping portions 14. Each clamping portion 14 has a pointed tooth 15 pointing towards the center of symmetry. Two elastic curved arcs 11 extend symmetrically from the shoulders of each clamping portion 14, extending from the shoulders of the clamping portion 14 to the shoulders of the adjacent clamping portion. The root of the elastic curved arc 11 and the clamping portion 14 are connected by a rounded corner. The four elastic curved arcs 11 connect the four clamping portions 14 to form a closed loop structure. A protruding angle 12 is provided on the outer side at the middle position of each elastic curved arc 11. The protruding angle 12 is a rectangular structure protruding outward in the width direction of the elastic curved arc. The elastic curved arc 11 is warped relative to the clamping portion 14. The protruding angle 12 is located at the farthest point from the clamping portion 14 at the middle of the elastic curved arc 11. After the closing clamp closes the tissue, the protruding angle 12 will not embed into the tissue. The actual object of the closing clamp is shown in the figure. Figure 1b As shown. A slit 13 is provided in the middle of the protruding angle 12. The slit 13 extends a certain depth from the end face of the protruding angle 12 towards the inner side of the elastic bend, but does not penetrate through it. The entrance of the slit has a chamfered bevel to guide the wedge-shaped wedge of the shearing forceps to align with the slit entrance. The chamfered bevel is a beveled angle. All closing clamps are made of superelastic nickel-titanium alloy. To facilitate endoscopic identification of the position of the protruding angle 12, the protruding angle 12 is set to a different color than the elastic bend 11. The closing clamps are installed in an open state on the outside of a compatible delivery cap. When the closing clamps are open, as... Figure 1c As shown, the elastic arc 11 will undergo bending deformation and torsional deformation with an increased radius of curvature. The inner region of the elastic arc 11 in the width direction near the protruding angle ( Figure 1c The dark-colored area changes from a stress-free state to a tensile stress state, and the outer area in the width direction changes from a stress-free state to a compressive stress state. The protruding angle 12, because it protrudes from the elastic bend 11, is basically in a stress-free state, and the crack 13 will not extend when it is not under stress. When the closing clamp is released, the four elastic bends 11 return to their initial shape, driving the four clamping parts 14 to clamp the target tissue.

[0035] Figure 1dThis diagram illustrates the cutting of the closure clamp by cutting forceps in this embodiment. When the closure clamp needs to be cut, cutting forceps with a wedge-shaped wedge 21 are inserted through the endoscope instrument channel. After reaching the target position, the wedge-shaped wedge 21 of the cutting forceps is pressed against the entrance of the central slit 13 of the protrusion. The hook-shaped arm 22 of the cutting forceps hooks the elastic bend 11 of the closure clamp. The hook-shaped arm 22 is then withdrawn, and the sloping surface of the wedge-shaped wedge 21 is used to compress and open the slit 13. The wedge-shaped wedge transforms a small axial force into a large lateral force through the force-saving principle of the sloping surface, causing the tip of the slit 13 to generate a concentrated tensile stress exceeding the tensile strength of the nickel-titanium alloy. When the concentrated tensile stress exceeds the concentrated tensile strength of the nickel-titanium alloy, the slit 13 will continue to extend inward toward the inner side of the elastic bend 11. In addition, the nickel-titanium alloy itself has a high crack propagation rate, making the elastic bend 11 and the protrusion 12 easy to cut. The clamping portion 14 of the closure clip can be pulled out of the tissue after all the elastic bends 11 and protrusions 12 are completely cut off. The cut closure clip is as follows: Figure 1e As shown.

[0036] Example 2

[0037] Figures 2a-2e A second embodiment of the closure clip of the present invention is shown. The closure clip is in the shape of an arched ellipse and includes two opposing clamping portions 14. One clamping portion has four wavy clamping teeth 15, and the other clamping portion has five wavy clamping teeth 15. Two elastic curved arcs 11 extend from the shoulders of the two sides of the clamping portions 14, forming a continuous closed-loop structure. The elastic curved arcs 11 are convex, and their roots are connected to the clamping portions 14 by rounded corners. A protruding angle 12 is provided on the outer side at the middle position of the elastic curved arc. The protruding angle 12 protrudes outward in the width direction of the elastic curved arc 11, and the elastic curved arc 11 is warped relative to the clamping portions 14. The protruding angle 12 is located at the farthest point on the elastic curved arc from the clamping portions 14 to ensure that the protruding angle 12 is not easily covered by tissue. A slit 13 is provided in the middle of the protrusion 12. The slit 13 extends to a certain depth from the end face of the protrusion 12 toward the inner side of the elastic bend 11, but does not penetrate through it. The entrance of the slit 13 is located on the end face of the protrusion 12, and the entrance of the slit has a rounded bevel to guide the wedge-shaped wedge of the cutting forceps to align with the slit. The closing clamp is made of a superelastic nickel-titanium alloy and is installed in an open shape on the outside of the endoscope cap, entering the patient's body together with the endoscope cap. When the closing clamp changes from a clamped state to an open state, the elastic bend 11 undergoes bending deformation and torsional deformation with an increased radius of curvature, such as... Figure 2bAs shown, the inner region in the width direction of the elastic bend 11 ( Figure 2b The dark-colored area changes from a stress-free state to a tensile stress state, while the outer area in the width direction changes from a stress-free state to a compressive stress state. The protruding angle 12, because it protrudes from the elastic bend 11, is basically in a stress-free state, and the crack 13 will not continue to extend when it is not under stress. When the closing clamp is released, the elastic bend 11 undergoes elastic recovery deformation, driving the clamping part 14 to clamp the target part.

[0038] Figure 2c This diagram illustrates the cutting of the closure clamp by the cutting pliers in this embodiment. The cutting pliers have the same structure as those in Embodiment 1. After extending the hook-shaped arm 22 of the cutting pliers, it hooks the middle position of the elastic bend 11 of the closure clamp. The wedge-shaped wedge 21 on the pliers head is pressed against the entrance of the crack 13 on the protruding end face. The hook-shaped arm 22, after hooking the elastic bend 11, retracts, causing the wedge-shaped wedge 21 to compress and open the crack 13. When the concentrated tensile stress at the tip of the crack 13 exceeds the tensile strength of the superelastic nickel-titanium alloy, the crack 13 continues to extend towards the inner side of the elastic bend, ultimately cutting off the protruding angle 12 and the elastic bend 11. The actual closure clamp before and after cutting is shown below. Figure 2e As shown, after cutting off both elastic arcs 11 of the closing clamp, the clamping part 14 can be pulled out of the tissue and removed.

[0039] Example 3

[0040] like Figures 3a-3eA third embodiment of the closing clip of the present invention is shown. The closing clip includes two opposing clamping portions 14 with clamping teeth. The two clamping portions 14 are provided with opposing wavy clamping teeth 15, and a clamping gap is left between the clamping teeth 15 of the two clamping portions. A diagonal arc extends from the shoulder of one of the clamping portions 14. After extending a certain length, the diagonal arc turns and continues to extend into a concave arc. At the end of the concave arc, it turns again and extends into another diagonal arc to the shoulder of the other clamping portion, finally forming an elastic arc 11 with two corners and a concave center. The root of the elastic bend 11 and the clamping part 14 are connected by a rounded transition. At the end faces of the two corners of the elastic bend 11, there are outwardly protruding angles 12. These angles 12 are located at the furthest point from the clamping part on the connecting bend. A crack 13 is provided in the middle of the angle 12, extending a certain depth from the end face of the angle 12 towards the inner side of the corner but not penetrating it. The entrance of the crack 13 has a rounded bevel. The closing clamp is made of a superelastic nickel-titanium alloy. To facilitate identification of the angles on the elastic bend under endoscopic visualization, the angles 12 are set to a different color than the elastic bend. When the closing clamp changes from a clamped state to an open state, the concave section in the middle of the elastic bend 11 undergoes bending deformation with a reduced radius of curvature, and the oblique section of the elastic bend 11 undergoes torsional deformation, such as… Figure 3b As shown, the middle region of the concave section of the elastic bend 11, the inner region in the width direction of the oblique section, and the inner region at the corner ( Figure 3b The dark-colored areas are all under tensile stress, while the outer area of ​​the corner is stress-free. The protruding corner 12, because it protrudes from the corner of the elastic bend, is basically unstressed. The crack 13 will not extend when unstressed. When the closing clamp is released, the elastic bend 11 undergoes elastic recovery deformation, and the closing clamp changes from an open state to a closed state.

[0041] Figure 3c A schematic diagram is shown of the above-mentioned closing clamp being cut by cutting pliers. The cutting pliers have the same structure and function as those in Embodiment 1. When the closing clamp needs to be cut, the hook-shaped arm 22 of the cutting pliers extends and hooks the inner side of the corner of the elastic bend. The wedge-shaped wedge 21 on the pliers head is pressed against the entrance of the protruding corner crack 13. The hook-shaped arm 22 is then withdrawn. The wedge-shaped wedge 21 applies a squeezing and spreading force to the crack 13, causing the crack 13 to continue to extend towards the inner side of the corner of the elastic bend until the corner of the elastic bend is completely broken. Figure 3dThe actual objects of the closing clamp and the cutting forceps are shown. When the corners of any two diagonally opposite elastic arcs are cut, the closing clamp loses its clamping force, and the clamping part 14 can be pulled out of the tissue. The cut closing clamp is as follows: Figure 3e As shown.

[0042] Example 4

[0043] Figures 4a-4e This illustrates a fourth embodiment of the closing clip of the present invention. The closing clip structure is similar to that of Embodiment Two, exhibiting an arched elliptical shape. The difference lies in that the protruding angle 12 on the elastic curved arc 11 of this embodiment is located at the middle of the inner surface of the elastic curved arc 11 and protrudes inward in the width direction of the elastic curved arc 11. A crack 13 is provided in the middle of the protruding angle 12, extending a certain depth from the outer surface of the elastic curved arc 11 towards the end face of the protruding angle but not penetrating it. The crack entrance has a chamfered bevel. When the closing clip is in the open state, the elastic curved arc 11 undergoes torsion and bending deformation with an increased radius of curvature. The actual open-form closing clip is as follows: Figure 4b As shown. The force state of the closed clamp at this time is as follows. Figure 4c As shown, the inner region in the width direction of the elastic bend 11 ( Figure 4c The darker area (medium-darker region) is a tensile stress region. Due to the force transmitted from the elastic bending arc, the outer region of the protruding corner in the thickness direction is also under tensile stress. However, because the deformation generated when the clamp opens is distributed across the entire elastic bending arc, the tensile stress at the crack in the middle of the protruding corner is much less than the tensile strength of the nickel-titanium alloy; therefore, the crack 13 will not extend. When the crack 13 is squeezed and opened by the wedge-shaped wedge 21 of the shearing clamp, as... Figure 4d As shown, the wedge-shaped wedge 21 of the cutting clamp provides a compressive force that acts only on the crack 13. Therefore, the tip of the crack 13 will generate a concentrated tensile stress exceeding the tensile strength of the nickel-titanium alloy material, causing the crack 13 to continue extending towards the end face of the protrusion 12, which in turn causes the protrusion 12 to break, thus shearing off the protrusion. The actual object of the sheared closed clamp is as follows: Figure 4e As shown.

[0044] Example 5

[0045] Figures 5a-5eThis is a schematic diagram of the structure of the fifth embodiment of the present invention. The closed clamp is similar in shape to that of embodiments two and four, and is an arched ellipse. The closed clamp includes two oppositely distributed clamping parts 14. Each clamping part 14 is provided with wavy clamping teeth 15. The clamping teeth 15 of the two clamping parts 14 are staggered and clamped together, with a gap between the clamping teeth. Two elastic curved arcs 11 extend from the shoulders of the clamping parts 14. The elastic curved arcs 11 extend outward in a convex shape to the shoulders of the opposite clamping parts. A protruding angle 12 protruding inward is provided at the middle position of the elastic curved arc 11. A crack 13 is provided in the middle of the protruding angle 12. A chamfered bevel is provided at the entrance of the crack. The crack 13 extends from the end face of the protruding angle 12 toward the outer side of the elastic curved arc 11 to a certain depth, but does not extend into the internal tensile stress area in the width direction of the elastic curved arc 11. Figure 5c Darker areas). Figure 5b A physical diagram of a closed clamp in its open state is shown. The elastic bend 11 undergoes bending and torsional deformation with an increased radius of curvature. The protruding angle 12 protrudes from the elastic bend 11, and the crack 13 does not extend into the internal tensile stress region in the width direction of the elastic bend 11. Figure 5c (Dark area), and because the deformation generated when the closing clamp opens is distributed across the entire elastic arc, the concentrated tensile stress generated at the tip of the crack is less than the tensile strength of the nickel-titanium alloy, so the crack 13 will not continue to extend.

[0046] In this embodiment, the closing clamp requires the use of cutting pliers with opposite cutting edges as in Embodiment 1. First, the wedge-shaped wedge with the opposite cutting edge of the cutting pliers hooks the entrance to the crack. Then, the end face limiting groove of the cutting pliers abuts against the outer side of the elastic bend 11. Next, the wedge-shaped wedge is withdrawn, causing it to compress and open the crack 13. Figure 5d As shown. When the concentrated tensile stress generated at the tip of the crack 13 exceeds the tensile strength of the superelastic nickel-titanium alloy, the crack 13 continues to extend towards the outer surface of the elastic bend 11 until the elastic bend 11 completely breaks. After the middle protrusions of the two elastic bends are completely cut off, the closure clip can be pulled out of the tissue and removed. The actual closure clip before and after being cut off is shown in the figure. Figure 5e As shown.

[0047] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the design concept disclosed in the present invention, namely, the design concept of setting a cracked protruding corner structure on an elastic bend, should be included within the scope of protection of the present invention.

Claims

1. A closed clamp with an easily shearable elastic bend, comprising clamping portions that are relatively distributed or centrally symmetrically distributed, wherein a plurality of clamping portions are connected to form a closed loop structure by elastic bends extending from both sides, wherein the elastic bends are provided with protruding corners, wherein a crack is provided in the middle of the protruding corners, wherein the crack extends to a certain depth from the end face of the protruding corners or the side face of the elastic bends toward the opposite side but does not penetrate, wherein when the crack is squeezed and opened by a wedge-shaped wedge, the crack will continue to extend toward the opposite side until the elastic bends and the protruding corners are completely broken.

2. The closing clip according to claim 1, characterized in that, The clamping part is provided with wavy or pointed teeth.

3. The closing clip according to claim 1, characterized in that, The elastic bend extends from the shoulder of one clamping part to the shoulder of the adjacent clamping part.

4. The closing clip according to claim 1, characterized in that, The elastic bend is warped relative to the clamping portion.

5. The closing clip according to claim 1, characterized in that, The elastic bend is a convex bend with a protruding angle in the middle.

6. The closing clip according to claim 1, characterized in that, The elastic bend is a concave bend with a corner, and the corner is provided with a protruding angle.

7. The closing clip according to claim 1, characterized in that, The protrusion angle protrudes towards the inside or outside of the connecting bend.

8. The closing clip according to claim 1, characterized in that, The crack did not extend into the tensile stress region of the elastic bend.

9. The closing clip according to claim 1, characterized in that, The entrance to the protruding angle crack is provided with a chamfered bevel.

10. The closing clip according to claims 1-9, characterized in that, The closing clamp is made of a superelastic nickel-titanium alloy.

Images