Sewing hook

Abstract

The utility model relates to a suture hook, which comprises a main body, a guide wire, a suture needle, a suture needle, a suture needle and a suture needle, the damping piece is arranged in the passing channel and is positioned on an inevitable path where the guide wire passes so as to increase the friction force when the guide wire passes; wherein the main body is provided with a groove opening communicated with the passing channel, the groove opening is matched with the damping piece, and the damping piece is configured to be at least partially exposed through the groove opening, so that a user can operate a guide wire located in the passing channel through the damping piece.

Description

TECHNICAL FIELD

[0001] The utility model relates to surgical instruments technical field especially relates to a suture hook. BACKGROUND

[0002] The suture hook is a kind of medical instrument, is used to carry out the suture operation of soft tissue in medical operation.Its shape and angle design are to adapt to different surgical requirements, for example, the bending angle and shape of suture hook can influence its mechanical properties in the process of soft tissue suture.At present, when guide wire passes through the passage, suture hook feels bad, leading to inconvenient operation.In addition, suture hook is mainly used in shoulder joint, knee joint etc., diameter is relatively thick, and the length of hook head end is relatively long, and the tissue, ligament etc.of wrist joint, ankle joint are smaller, and conventional suture hook is not convenient for operation, and will damage tissue, and is not suitable for small joint operation such as wrist joint, ankle joint. SUMMARY

[0003] In view of the above analysis, the utility model aims at providing a suture hook, at least to solve one of the above problems.

[0004] The utility model discloses a suture hook, comprising:

[0005] The utility model provides a suture hook, comprising:

[0006] Main body is equipped with the passage for the guide wire to pass through;

[0007] Damping part is arranged in the passage for the guide wire to pass through and is located on the necessary road of the guide wire to pass through to increase the friction of the guide wire to pass through;

[0008] Wherein, the main body is equipped with the recessed groove mouth that passes through with the passage for the guide wire to pass through, the recessed groove mouth is matched with the damping part, the damping part is configured to at least part can be exposed by the recessed groove mouth, to be ready for the user to operate the guide wire in the passage for the guide wire to pass through by the damping part.

[0009] Further, the front and back sidewalls of the recessed groove mouth are provided with the perforation that communicates with the passage for the guide wire to pass through, and the left and right sides of the recessed groove mouth are open.

[0010] The damping part is located on the bottom wall of the recessed groove mouth, and the guide wire is located on the damping part when passing through the recessed groove mouth.

[0011] Preferably, the bottom wall of the recessed groove mouth is located on the center line of the main body.

[0012] The top of the damping part exceeds the center line of the main body, and the distance between the top end of the damping part and the center line of the main body is not more than 3mm.

[0013] Further, the front and back side walls of the groove are outwardly inclined, and the included angle between the front and back side walls and the bottom wall of the groove is α, 110°≤α≤165°.

[0014] Preferably, the edges of the groove opening and the side walls of the main body are arc-shaped transitions, and the front and back side walls and the bottom wall of the groove opening are arc-shaped transitions.

[0015] Further, the damping member is one of knurling, a roller, or a pleat protrusion.

[0016] When the damping member is a roller, the groove opening is provided with an assembly opening for assembling the roller, and the roller is rotatably installed in the assembly opening.

[0017] When the damping member is a pleat protrusion, the bottom wall of the groove opening is provided with a plurality of strip-shaped protrusions, the extension direction of the strip-shaped protrusion is parallel to the center line, and the strip-shaped protrusion extends from the left side to the right side of the groove opening.

[0018] Further, the main body comprises a connecting handle and a suture hook, and the passing channel extends from the handle to the suture hook.

[0019] The groove opening and the damping member are arranged in the handle, and the groove opening is close to the end of the handle.

[0020] Further, the passing channel comprises a first channel at the handle and a second channel at the suture hook, and the first channel and the second channel are through.

[0021] The first channel extends from the first end to the end of the handle, or / and, extends from the side wall to the end of the handle.

[0022] The second channel extends from the first end to the end of the suture hook.

[0023] Preferably, the handle is provided with a first inlet or / and a second inlet in communication with the first channel.

[0024] The first inlet is arranged at the first end of the handle.

[0025] The second inlet is arranged at the side wall of the handle.

[0026] Further, the handle and the suture hook are detachably connected.

[0027] Preferably, the end of the handle is provided with a slot in communication with the first channel, the slot is matched with the first end of the suture hook, and the suture hook and the handle are connected by plug-in connection through the slot.

[0028] Preferably, the handle side wall is provided with a threaded hole vertically penetrating the insertion slot, and when the suture hook is inserted into the insertion slot, a threaded screw is screwed into the threaded hole to abut against the suture hook side wall;

[0029] Preferably, the suture hook side wall is provided with an abutting platform at a position corresponding to the threaded hole.

[0030] Further, the handle part comprises a supporting sleeve and an inner core, and the supporting sleeve is sleeved outside the inner core;

[0031] The inner core is centrally provided with the second channel, and the second channel extends from the first end to the tail end of the inner core;

[0032] The length of the inner core is greater than the length of the supporting sleeve, and the two ends of the inner core are located at the two sides of the supporting sleeve, respectively.

[0033] Further, the supporting sleeve is in a straight cylindrical shape, and the tail end of the inner core is in a hook shape.

[0034] Preferably, the inner core comprises a straight rod part and a bent part connected to each other, the straight rod part is arranged in the supporting sleeve, and the length of the straight rod part is greater than the length of the supporting sleeve.

[0035] Preferably, the tail end of the bent part is a chamfered surface, and the chamfered surface is directed to the direction where the straight rod part is located.

[0036] Further, the length of the supporting sleeve is 60-80 mm, and the outer diameter of the supporting sleeve is 3-4 mm.

[0037] The bent angle of the bent part is one of 0°, 15°, 25°, 45°, 60° and 90°, the inner diameter of the inner core is 0.9-1.0 mm, the outer diameter of the inner core is 1.2-1.5 mm, the length of the straight rod part is 70-100 mm, and the length of the bent part is 10-20 mm.

[0038] Preferably, the tail end of the bent part is a chamfered surface, and the chamfered surface is directed to the direction where the straight rod part is located, and the included angle between the chamfered surface and the center line of the tail end of the bent part is γ, and 10°≤γ≤60°.

[0039] Compared with the prior art, the utility model at least has one of the beneficial effects: by setting the at least partially exposed damping member on the route that the guide wire must pass through in the main body, the friction of the guide wire at the damping member of the passing route is improved, the user can easily feel the position of the guide wire, the overline efficiency of the guide wire is improved, and the operation performance of the suture hook is enhanced.

[0040] The above technical solutions can be combined with each other to realize more optional combination solutions. Other features and advantages of the present application will be described in the following content, and some advantages can be apparent from the description or can be understood by implementing the present application. The purposes and other advantages of the present application can be realized and obtained through the content specifically indicated in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0041] The drawings are only for the purpose of illustrating specific embodiments and are not considered as limiting the present application, and the same reference signs represent the same components throughout the drawings.

[0042] Figure 1 Structure schematic view of suture hook in specific embodiment (one);

[0043] Figure 2 Structure schematic view of suture hook in specific embodiment (two);

[0044] Figure 3 Sectional view of suture hook in specific embodiment;

[0045] Figure 4 Structure schematic view of handle in specific embodiment (one);

[0046] Figure 5 Structure schematic view of handle in specific embodiment (two);

[0047] Figure 6 Sectional view of handle in specific embodiment;

[0048] Figure 7 Structure schematic view of another structure of suture hook in specific embodiment (one);

[0049] Figure 8 Structure schematic view of another structure of suture hook in specific embodiment (two);

[0050] Figure 9 Sectional view of another structure of suture hook in specific embodiment;

[0051] Figure 10 Structure schematic view of another structure of handle in specific embodiment;

[0052] Figure 11 Structure schematic view of suture hook in specific embodiment (one);

[0053] Figure 12 Structure schematic view of suture hook in specific embodiment (two);

[0054] Figure 13An exploded view of the suture hook in the specific embodiment;

[0055] Figure 14 A partial enlarged view of the inner core in the specific embodiment.

[0056] Reference signs:

[0057] 1 - main body; 101 - recessed opening; 101a - through hole; 101b - assembly opening; 102 - first channel; 103 - second channel; 104 - first inlet; 105 - second inlet; 106 - insertion slot; 107 - threaded hole; 11 - connecting handle; 12 - suture hook; 121 - abutting platform; 122 - supporting sleeve; 123 - inner core; 123a - straight rod part; 123b - bent part; 2 - damping member; 3 - set screw. DETAILED DESCRIPTION

[0058] The preferred embodiments of the present application will be described in detail below with reference to the drawings, wherein the drawings constitute a part of the present application and serve to explain the principles of the present application together with the embodiments of the present application, but are not intended to limit the scope of the present application.

[0059] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the term "connected" should be interpreted in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrally connected, which can be mechanically connected, or electrically connected, which can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0060] The terms "top", "bottom", "above", "under" and "on" used throughout the description are relative positions of the components of the device, for example, the relative positions of the top and bottom substrates inside the device. It can be understood that the device is multifunctional, regardless of their orientation in space.

[0061] The general working surface of the present application can be a plane or a curved surface, which can be inclined or horizontal. For the convenience of explanation, the embodiments of the present application are placed on a horizontal plane and used on the horizontal plane, and the "high and low" and "up and down" are defined accordingly.

[0062] One specific embodiment of the present application discloses a suture hook, as shown in Figures 1-14 which comprises:

[0063] The main body 1 is provided with a through channel for the guide wire to pass through, i.e. the guide wire is located in the through channel and can pass through the through channel;

[0064] The damping member 2 is arranged in the passing channel and is located on a path that the guide wire must pass through, so as to increase the friction of the guide wire passing through.

[0065] The main body 1 is provided with a groove opening 101 that penetrates the passing channel, the groove opening 101 cooperates with the damping member 2, and the damping member 2 is configured to be at least partially exposed through the groove opening 101, so as to be operated by a user through the damping member 2 to control the guide wire in the passing channel.

[0066] The suture hook of the utility model improves the friction of the guide wire at the damping member in the passing channel, facilitates the user to feel the position of the guide wire, improves the wire passing efficiency of the guide wire, and enhances the operation performance of the suture hook.

[0067] The front and rear sidewalls of the groove opening 101 are provided with through holes 101a that communicate with the passing channel, and the left and right sides of the groove opening 101 are open, so that fingers can be inserted and operated, that is, a part of the passing channel is composed of the groove opening 101, the small section is open, and the guide wire is exposed when passing through. Preferably, the shape of the groove opening 101 is similar to the shape of a "small boat", that is, the front and rear sidewalls of the groove opening 101 are outwardly inclined, that is, the groove opening 101 gradually increases from bottom to top, which is more suitable for the shape of the finger and improves the use performance of the suture hook. Further preferably, the included angle between the front and rear sidewalls and the bottom wall of the groove opening 101 is α, 110°≤α≤165°, and in the embodiment, α=145°.

[0068] The included angle between the front and rear sidewalls and the bottom wall of the groove opening can be the same or different.

[0069] In the utility model, "front", "rear", "first" and "last" are positioned according to the normal passing direction of the guide wire in the main body, "front" and "first" are located upstream, and "rear" and "last" are located downstream.

[0070] The edges of the groove opening 101 are arc-shaped and transitionally connected to the sidewalls of the main body, and the front and rear sidewalls and the bottom wall of the groove opening 101 are also arc-shaped and transitionally connected, so as to avoid the fingers being accidentally scratched when operating.

[0071] The damping member 2 is located on the bottom wall of the groove opening 101, the guide wire passes through the groove opening 101 and is located on the damping member 2, and the operator slides the guide wire on the damping member 2, on the one hand, to facilitate the feeling of the position of the guide wire, and on the other hand, to facilitate the guide wire to pass through the passing channel.

[0072] Preferably, the bottom wall of the groove opening 101 is located on the center line A-A of the main body 1, that is, the center line A-A passes through the bottom wall of the groove opening 101.

[0073] It should be noted that the top of the damping member 2 slightly exceeds the center line A-A, and the distance between the top of the damping member and the center line A-A is not more than 3 mm, so as to ensure the damping effect of the damping member.

[0074] The damping member 2 can be one of knurling, a roller or a wrinkle protrusion, such as Figures 1-6 As shown in the figure, the damping member 2 is a roller; as Figures 7-10 As shown in the figure, the damping member 2 is a wrinkle protrusion.

[0075] When the damping member 2 is a roller, the groove port 101 is provided with an assembly port 101b for assembling the roller, the roller is rotatably installed in the assembly port 101b, and the surface of the roller is provided with anti-skid lines such as grooves or protrusions. In order to avoid affecting the use of the suture hook, the bottom of the roller does not exceed the bottom of the assembly port 101. It should be noted that the assembly port 101b extends vertically from the bottom wall of the groove port 101 to the side wall of the main body 101, that is, the side wall of the main body is connected with the bottom wall of the groove port.

[0076] When the damping member 2 is a wrinkle protrusion, a plurality of strip-shaped protrusions are arranged at intervals on the bottom wall of the groove port 101 (that is, the protrusions constitute a wrinkle protrusion), the extension direction of the strip-shaped protrusions is perpendicular to the center line A-A, that is, perpendicular to the direction of the guide wire passing through, and the strip-shaped protrusions extend from the left side to the right side of the groove port 101, so as to generate a damping effect on the passing of the guide wire. The height of the strip-shaped protrusion is not more than 3 mm. In this embodiment, the groove port 101 is provided with four strip-shaped protrusions arranged in parallel at intervals.

[0077] According to an embodiment of the utility model, the main body 1 includes a connecting handle 11 and a suture hook 12, the passing channel extends from the handle 11 to the suture hook 12; the groove port 101 and the damping member 2 are arranged on the handle 11, and the groove port 101 is close to the end of the handle (the end of the handle connected with the suture hook 12).

[0078] The passing channel includes a first channel 102 located at the handle 11 and a second channel 103 located at the suture hook 12, the first channel 102 and the second channel 103 are connected, so that the guide wire can smoothly enter the second channel 103 from the first channel, that is, the perforation 101a on the rear side wall of the groove port 101 (the side wall close to the suture hook) is connected with the second channel 103, and the groove port 101 constitutes part of the first channel 102.

[0079] The center lines of the first channel 102 and the second channel 103 are coincided with the center line A-A of the main body.

[0080] The first channel 102 extends from the head end (the end away from the suture hook) to the tail end of the handle 11, or / and extends from the side wall of the handle 11 to the tail end. That is, the handle 11 is provided with a first inlet 104 or / and a second inlet 105 in communication with the first channel 102, the first inlet 104 is arranged at the head end of the handle, and the second inlet 105 is arranged at the side wall of the handle 11, so that the guide wire can enter the first channel from the first inlet 104 or the second inlet 105, and the user can choose the inlet for inserting the guide wire according to the use habit. In the embodiment, the handle 11 is provided with the first inlet and the second inlet.

[0081] The second inlet 105 is preferably arranged close to the recessed opening 101.

[0082] The second channel 103 extends from the head end (the end connected with the handle) to the tail end (the end away from the handle) of the suture hook 12.

[0083] Preferably, the handle 11 and the suture hook 12 are detachably connected, so that various types of suture hooks 12 can be arranged, and the appropriate suture hook can be selected according to the use scene and assembled to the handle 11, so as to improve the application range of the suture hook.

[0084] The handle 11 and the suture hook 12 can be connected in a detachable manner such as insertion, screwing, clamping, etc. In the embodiment, the handle 11 and the suture hook 12 are connected in a detachable manner by insertion. Specifically, the tail end of the handle 11 is provided with an insertion slot 106 penetrating the through hole 101a (the through hole on the rear side wall of the recessed opening 101), that is, the tail end of the handle 11 is provided with an insertion slot 106 penetrating the first channel 103, and the insertion slot 106 is matched with the head end (the end connected with the handle) of the suture hook 12. The center line of the insertion slot 106 coincides with the center line A-A of the main body, the insertion slot 106 belongs to a part of the first channel 103, the suture hook 12 is inserted into the insertion slot 106, and the through hole 101a penetrates the second channel 104.

[0085] In order to improve the connection performance of the handle 11 and the suture hook 12 and avoid the suture hook 12 from falling off the handle 11, the side wall of the handle 11 is provided with a threaded hole 107 penetrating perpendicularly to the insertion slot 106, and when the suture hook 12 is inserted into the insertion slot 106, the set screw 3 is screwed into the threaded hole 107 to abut against the side wall of the suture hook 12, so as to avoid the suture hook 12 from falling off the insertion slot 106. Further, the side wall of the suture hook 12 is provided with an abutting platform 121 corresponding to the threaded hole 107, so as to improve the connection strength of the set screw and the suture hook.

[0086] In order to ensure the structural stability of the suture hook, the suture hook 12 comprises a support sleeve 122 and an inner core 123, the support sleeve 122 is sleeved outside the inner core 123 to protect the inner core. That is, the central part of the support sleeve 122 is provided with a passage for the inner core 123 to pass through.

[0087] The abutting platform 121 is arranged on the side wall of the support sleeve 122, and the second passage 103 is arranged in the center of the inner core, the second passage 103 extends from the first end (the end connected with the handle) to the terminal end (the end away from the handle) of the inner core, and the first end of the inner core passes through the support sleeve 122 and is located in the slot 106.

[0088] The length of the inner core 123 is greater than the length of the support sleeve 122, and the two ends of the inner core 123 are located on the two sides of the support sleeve 122, that is, the two ends of the inner core extend from the two ends of the support sleeve.

[0089] Preferably, the shape of the support sleeve 122 is a straight cylinder, and the terminal end of the inner core 123 is in the shape of a hook. Specifically, the inner core 123 comprises a connected straight rod part 123a and a bending part 123b, the straight rod part 123a is sleeved in the support sleeve 122, and the length of the straight rod part 123a is greater than the length of the support sleeve, and the two ends of the straight rod part 123a are located on the two sides of the support sleeve 122.

[0090] The second passage extends from the first end of the straight rod part 123a to the terminal end of the bending part 123b, and the shape of the second passage is the same as the shape of the inner core and is located in the center of the inner core.

[0091] The center line of the straight rod part 123a coincides with the main body center line A-A, and the bending part 123b extends in a direction deviating from the center line A-A.

[0092] The bending angle β of the bending part is one of 0°, 15°, 25°, 45°, 60° and 90°. The same handle can be equipped with suture hooks with multiple bending angles, and the appropriate specification of the suture hook can be selected according to the different suture positions. The bending angle of the bending part refers to the included angle between the center line of the terminal end of the bending part and the center line of the straight rod part.

[0093] Preferably, 15°≤β≤60°, and the suture hook with the bending angle is suitable for the widest range of applications.

[0094] Preferably, the terminal end of the bending part 123b is a chamfered surface, and the chamfered surface is chamfered inward, that is, the chamfered surface is chamfered toward the direction where the straight rod part is located. The included angle between the chamfered surface and the center line of the terminal end of the bending part 123b is γ, and 10°≤γ≤60°.

[0095] The length of the supporting sleeve is 60-80 mm, and the outer diameter of the supporting sleeve is 3-4 mm. The inner diameter of the inner core is 0.9-1.0 mm, and the outer diameter of the inner core is 1.2-1.5 mm (the inner diameter of the supporting sleeve is also about 1.2-1.5 mm). The length of the straight rod part of the inner core is 70-100 mm, and the length of the bending part is 10-20 mm. Thus, the problem of small joint surgery suture that cannot be completed by a conventional curved hook is solved, and the curved hook is especially suitable for the suture of finger joints, wrist joints, ankle joints, ligaments and the like, and is suitable for various small joint surgeries.

[0096] In order to facilitate the user to hold, the length of the handle is 130-140 mm, and the diameter of the handle is 15-17 mm.

[0097] In order to improve the structural stability of the suture curved hook, the part close to the end of the handle is tapered, and the diameter gradually decreases, that is, the diameter of the end is the smallest. The part close to the end (close to one end of the bending part) of the supporting sleeve is tapered, and the diameter gradually decreases, that is, the diameter of the end is the smallest.

[0098] The guide wire is a nickel-titanium alloy wire, which is used to pull the suture. The material of the supporting sleeve is metal, and the material of the inner core is high-strength stainless steel.

[0099] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A suturing hook, characterized by The utility model relates to a suture needle, comprising: a main body provided with a passing channel for a guide wire to pass through; a damping member arranged in the passing channel and located on a path that the guide wire must pass through to increase the friction of the guide wire passing through; wherein the main body is provided with a groove opening that penetrates the passing channel, the groove opening cooperates with the damping member, and the damping member is configured to be at least partially exposed outside the groove opening so that a user can operate the guide wire in the passing channel through the damping member.

2. The stitching hook of claim 1, wherein, The front and rear sidewalls of the groove opening are provided with through holes that communicate with the passing channel, and the left and right sides of the groove opening are open; The damping member is located on the bottom wall of the groove opening, and the guide wire passes through the groove opening and is located on the damping member; Preferably, the bottom wall of the groove opening is located on the center line of the main body; The top of the damping member exceeds the center line of the main body, and the distance between the top end of the damping member and the center line of the main body is not more than 3 mm.

3. The stitching hook of claim 2, wherein, The front and rear sidewalls of the groove are outwardly inclined, and the included angle between the front and rear sidewalls and the bottom wall of the groove opening is α, 110°≤α≤165°; Preferably, the edges of the groove opening and the sidewalls of the main body are arc-shaped transitions, and the front and rear sidewalls and the bottom wall of the groove opening are arc-shaped transitions.

4. The stitching hook of claim 2, wherein, The damping member is one of knurling, a roller, or a wrinkle protrusion; When the damping member is a roller, the groove opening is provided with an assembly opening for assembling the roller, and the roller is rotatably installed in the assembly opening; When the damping member is a wrinkle protrusion, the bottom wall of the groove opening is provided with a plurality of strip-shaped protrusions at intervals, the extension direction of the strip-shaped protrusions is the center line, and the strip-shaped protrusions extend from the left side to the right side of the groove opening.

5. The stitching hook of any one of claims 1 to 4, wherein, The main body comprises a connecting handle and a suture hook, and the passing channel extends from the handle to the suture hook; The groove opening and the damping member are arranged in the handle, and the groove opening is close to the end of the handle.

6. The stitching hook of claim 5, wherein, The passing channel comprises a first channel located in the handle and a second channel located in the suture hook, and the first channel penetrates the second channel; The first channel extends from the first end to the end of the handle, or / and extends from the sidewall to the end of the handle; The second channel extends from the first end to the end of the suture hook; Preferably, the handle is provided with a first inlet or / and a second inlet that communicates with the first channel; The first inlet is arranged at the first end of the handle; The second inlet is arranged at the sidewall of the handle.

7. The stitching hook of claim 6, wherein, The handle and the suture hook are detachably connected; Preferably, the end of the handle is provided with a slot that penetrates the first channel, the slot cooperates with the first end of the suture hook, and the suture hook and the handle are connected by inserting the slot; Preferably, the sidewall of the handle is provided with a threaded hole that penetrates perpendicularly to the slot, and when the suture hook is inserted into the slot, a locking screw is screwed into the threaded hole to abut against the sidewall of the suture hook; Preferably, the sidewall of the suture hook is provided with an abutting platform at a position corresponding to the threaded hole.

8. The stitching hook of claim 6, wherein, The handle part comprises a supporting sleeve and an inner core, and the supporting sleeve is sleeved outside the inner core; The inner core is centrally provided with the second channel, and the second channel extends from the first end to the end of the inner core; The length of the inner core is greater than the length of the supporting sleeve, and two ends of the inner core are located at two sides of the supporting sleeve respectively.

9. The stitching hook of claim 8, wherein, The supporting sleeve is in a straight cylinder shape, and the end of the inner core is in a hook shape. Preferably, the inner core comprises a straight rod part and a bent part connected to each other, the straight rod part is arranged in the supporting sleeve, and the length of the straight rod part is greater than the length of the supporting sleeve. Preferably, the end of the bent part is in a chamfered surface, and the chamfered surface is directed to the direction where the straight rod part is located.

10. The stitching hook of claim 9, wherein, The length of the supporting sleeve is 60-80 mm, and the outer diameter of the supporting sleeve is 3-4 mm. The bending angle of the bent part is one of 0°, 15°, 25°, 45°, 60° and 90°, the inner diameter of the inner core is 0.9-1.0 mm, the outer diameter of the inner core is 1.2-1.5 mm, the length of the straight rod part is 70-100 mm, and the length of the bent part is 10-20 mm. Preferably, the end of the bent part is in a chamfered surface, and the chamfered surface is directed to the direction where the straight rod part is located, the included angle between the chamfered surface and the center line of the end of the bent part is γ, and 10°≤γ≤60°.

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