An orthodontic anchorage screw

Abstract

This utility model relates to an orthodontic anchorage screw, which, from bottom to top, comprises a threaded section, a smooth section, a middle cap, a connecting rod section, and a top cap. The width of the connecting rod section is smaller than the width of the middle cap and the top cap at both ends. The middle cap, the connecting rod section, and the top cap form a groove for binding with a strap. The top cap is circular, with its top surface being an arched spherical surface with a smooth transition at the periphery, and its bottom surface also having a smooth transition at the periphery. The middle cap has a hexagonal prism-shaped portion. It is an orthodontic anchorage screw with a reasonable structure that reduces postoperative discomfort caused by friction between the intraoral anchorage screw and the mucosal tissue.

Description

Technical Field

[0001] This utility model relates to a medical fixation screw, specifically an orthodontic anchorage screw used in the process of orthodontic treatment. Background Technology

[0002] Since the pure titanium spiral implant pioneered by Branemark in Sweden was recognized worldwide, it has achieved excellent medical treatment results. Due to its good biocompatibility and mechanical strength, good retention and corrosion resistance, it can form a good interface with bone tissue, mucous membrane tissue and skin after being implanted in the human body and can remain in the human jawbone for a long time, and has been widely used. There have been some reports on the use of pure titanium spiral implants for orthodontic anchorage. Chinese utility model patent ZL200320124802.0 (publication number CN2680217Y), entitled "Microscrew Fixation Anchorage for Orthodontics," discloses such a microscrew fixation anchorage for orthodontics. This microscrew fixation anchorage is integrally manufactured, with a maximum diameter of 1.2-3 mm and a length of 4-15 mm. It includes a head, a neck, a tightening part, and a threaded part. The neck is located between the head and the tightening part, and its diameter is smaller than the diameters of the head and the tightening part. The tightening part is a regular hexagonal prism. The threaded part has a tapered self-tapping thread that extends to the tail of the tightening part. A through hole is provided on the head and / or the tightening part, and a base protruding from the tightening part is located below it. This fixation anchorage is compact, requires no flap flipping, and can be used directly by screwing it in.

[0003] The head and tightening part of the aforementioned anchorage nail are both hexagonal prisms. In particular, the hexagonal prism shape of the head makes the surface of the nail head not smooth enough, resulting in greater friction between the anchorage nail in the patient's mouth and the mucous membrane of the lips, causing more obvious discomfort.

[0004] During the procedure, the nail head is exposed on the outermost side and will come into friction with the mouth and lips. However, the nail head in the aforementioned patent is a polygonal shape that is easy to twist with a hand tool. In addition, the surface of the groove structure on which the rubber band (or rope) is tied is not obstructed, which makes it risky for the rubber band (or rope) to come out of the groove. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to provide an orthodontic anchorage nail with a reasonable structure that reduces the discomfort caused by friction between the intraoral anchorage nail and the mucosal tissue after surgery, in light of the above-mentioned existing technology.

[0006] The technical solution adopted by this utility model to solve the first technical problem mentioned above is as follows: an orthodontic anchorage nail, which has a threaded section, a smooth rod section, a middle cap, a connecting rod section, and a top cap from bottom to top. The width of the connecting rod section is smaller than the width of the middle cap and the top cap at both ends. The middle cap, the connecting rod section, and the top cap form a groove for binding with a rope. The top cap is circular, the top surface of the top cap is an arched spherical surface with a smooth transition at the periphery, and the bottom surface of the top cap has a smooth transition at the periphery. The middle cap has a hexagonal prism-shaped part.

[0007] As an improvement, the aforementioned intermediate cap also has an outer circular portion connecting the hexagonal prism-shaped portion and the smooth rod section. The outer circular portion encloses each side of the hexagonal prism-shaped portion, reducing friction between the hexagonal prism-shaped portion and the oral mucosa.

[0008] To facilitate the binding of the tying rope (orthodontic wire) on the connecting rod, the aforementioned connecting rod section is improved by having a radially penetrating thread hole. During binding, the tying rope passes through the thread hole before binding, resulting in a more secure binding.

[0009] Furthermore, the top cap is provided with a wire-inserting groove on its upper surface, which is parallel to and radially penetrates the threading hole. When fixing with orthodontic wire, it is not necessary to pass the wire directly through the threading hole. Instead, the orthodontic wire is simply inserted from the wire-inserting groove into the threading hole and then wound around the side wall of the threading hole, making it convenient to use.

[0010] Preferably, the width of the wire-insertion groove is smaller than the diameter of the threading hole. This prevents the orthodontic wire wrapped around the sidewall of the threading hole from detaching from the sidewall, thus securing the orthodontic wire more firmly to the sidewall of the threading hole.

[0011] Further optimization involves rounding the first joints between the connecting rod segment and the intermediate and top caps, with a rounding radius of 0.1–0.3 mm. This rounding at the first joints between the connecting rod segment and the intermediate and top caps ensures a smooth transition of the inner edge of the groove, better preventing wear on the orthodontic wires suspended within the groove from the inner edge of the groove.

[0012] As an improvement, the first thickness of the top cap is less than the second thickness of the middle cap. The smaller the thickness of the top cap, the less contact it has with the oral mucosa. Since the middle cap needs to be used with hand tools, it is better to have a slightly larger thickness.

[0013] As an improvement, the second connection between the above-mentioned smooth rod section and the top cap is rounded, with a rounding radius of 0.2 to 0.4 mm, preferably 0.3 mm.

[0014] As an improvement, the lower end of the aforementioned threaded section has a chip removal groove with a cutting edge. This allows the cutting edge to form a clear thread path in the bone tissue during self-tapping, thus immediately achieving stability; the chip removal groove can also accommodate bone fragments cut off during self-tapping, making it easier to screw the anti-nail in.

[0015] Compared with existing technologies, the advantages of this invention are as follows: It changes the traditional design of orthodontic anchorage screws by placing the hexagonal prism-shaped part for screwing in the middle cap, ensuring that the screw can be screwed in using hand tools; the top cap is circular, with an arched spherical top surface and a smooth transition at the bottom perimeter. The top cap is located at the outermost end during surgery, effectively reducing the friction and discomfort between the intraoral anchorage screw and the oral mucosa, minimizing oral mucosal friction and irritation; the arched spherical top surface of the cap gives it a fluid-like surface appearance, further reducing friction on the oral mucosa. The smooth transition at the bottom perimeter further reduces friction between the cap and the oral mucosa. Attached Figure Description

[0016] Figure 1 This is a perspective view of the first embodiment of the present utility model;

[0017] Figure 2 This is a top view of the first embodiment of the present invention;

[0018] Figure 3 for Figure 1 Sectional view along axis AA;

[0019] Figure 4 This is a front view of the second embodiment of the present invention;

[0020] Figure 5 This is a front view of the third embodiment of the present invention. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] like Figures 1-3 The image shown is the first embodiment of this utility model.

[0023] An orthodontic anchorage screw, made entirely of titanium, comprises, from bottom to top, a threaded section 1, a smooth section 2, a middle cap 3, a connecting section 4, and a top cap 5. The width of the connecting section 4 is smaller than the widths of the middle cap 3 and the top cap 5 at both ends. The middle cap 3, the connecting section 4, and the top cap 5 form a groove 6 for securing with a binding rope. The lower end of the threaded section 1 has a chip removal groove 1a with a cutting edge.

[0024] The unique feature of this utility model is that: the top cap 5 is circular, the top surface 5a of the top cap 5 is an arched spherical surface with a smooth transition at the periphery, and the bottom surface 5b of the top cap 5 has a smooth transition at the periphery; the middle cap 3 has a hexagonal prism-shaped portion 3a. The middle cap 3 also has an outer circular portion 3b that connects the hexagonal prism-shaped portion 3a and the smooth rod segment 2.

[0025] The first connection points 6a between the connecting rod segment 4 and the middle cap 3 and the top cap 5 are all rounded, with a radius of 0.1 to 0.3 mm, preferably 0.2 mm.

[0026] The first thickness h1 of the top cap 5 is less than the second thickness h2 of the middle cap 3.

[0027] The second joint 2a between the bare rod section 2 and the top cap 5 is rounded, with a radius of 0.2 to 0.4 mm, preferably 0.3 mm.

[0028] This design departs from traditional orthodontic anchorage screw design, placing the hexagonal prism-shaped portion for screwing in the traction screw on the central cap 3, ensuring that the traction screw can be screwed in using hand tools. The top cap 5 is circular, with its top surface 5a being an arched spherical surface and its bottom surface 5b having a smooth transition at the periphery. The top cap 5 is located at the outermost end during surgery, effectively reducing the friction and discomfort between the intraoral anchorage screw and the oral mucosa, minimizing oral mucosal friction and irritation. The arched spherical surface of the top surface 5a gives it a fluid-like appearance, further reducing friction on the oral mucosa. The smooth transition at the periphery of the bottom surface of the top cap 5 further reduces friction on the oral mucosa.

[0029] like Figure 4 The following is a second embodiment of the present invention.

[0030] The difference between this embodiment and the first embodiment is that the connecting rod segment 4 is provided with a radially penetrating thread hole 7. This makes it easier to tie the rope (orthodontic wire) to the connecting rod. When tying, the rope passes through the thread hole before tying, resulting in a more secure tie.

[0031] like Figure 5 The following is a third embodiment of the present invention.

[0032] The difference between this embodiment and the second embodiment is that the upper surface of the top cap 5 is provided with a wire-inserting groove 8 that is parallel to and radially penetrates the threading hole 7. When fixing with orthodontic wire, it is not necessary to pass the wire directly through the threading hole 7; the orthodontic wire is simply inserted from the wire-inserting groove 8 into the threading hole 7 and wound around the side wall of the threading hole 7, making it convenient to use. The width of the wire-inserting groove 8 is smaller than the diameter of the threading hole 7. This prevents the orthodontic wire wound around the side wall of the threading hole 7 from detaching from the side wall, thus more firmly fixing the orthodontic wire to the side wall of the threading hole 7.

[0033] It should be noted that in the description of this embodiment, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. An orthodontic anchorage screw, comprising, from bottom to top, a threaded section (1), a smooth section (2), a middle cap (3), a connecting section (4), and a top cap (5), wherein the width of the connecting section (4) is less than the width of the middle cap (3) and the top cap (5) at both ends, and the middle cap (3), the connecting section (4), and the top cap (5) form a groove (6) for binding with a binding rope; characterized in that: The top cap (5) is circular, the top surface (5a) of the top cap (5) is an arched spherical surface with a smooth transition at the periphery, and the bottom surface (5b) of the top cap (5) has a smooth transition at the periphery; the middle cap (3) has a hexagonal prism-shaped part (3a).

2. The orthodontic anchorage screw according to claim 1, characterized in that: The intermediate cap (3) also has an outer circular portion (3b) that connects the hexagonal prism-shaped portion (3a) and the smooth rod segment (2).

3. The orthodontic anchorage screw according to claim 1, characterized in that: The connecting rod segment (4) is provided with a radial through hole (7).

4. The orthodontic anchorage screw according to claim 3, characterized in that: The top cap (5) is provided with a wire insert groove (8) that is parallel to the wire hole (7) and radially penetrates it.

5. The orthodontic anchorage screw according to claim 4, characterized in that: The width of the wire insertion groove (8) is smaller than the diameter of the wire threading hole (7).

6. The orthodontic anchorage screw according to claim 1, characterized in that: The first connection point (6a) between the connecting rod segment (4) and the middle cap (3) and the top cap (5) is rounded, with a radius of 0.1 to 0.3 mm.

7. The orthodontic anchorage screw according to claim 1, characterized in that: The first thickness (h1) of the top cap (5) is less than the second thickness (h2) of the middle cap (3).

8. The orthodontic anchorage screw according to claim 1, characterized in that: The second joint (2a) between the bare rod section (2) and the top cap (5) is rounded, with a radius of 0.2 to 0.4 mm.

9. The orthodontic anchorage screw according to claim 1, characterized in that: The lower end of the threaded section (1) has a chip removal groove (1a) with a cutting edge.

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