Temporomandibular joint disc reduction nail

Abstract

The utility model relates to a temporomandibular joint disc reduction nail which comprises a nail cap, a polished rod portion arranged in front of the nail cap, a threaded portion arranged in front of the polished rod portion, a conical guide portion arranged in front of the threaded portion, a threaded cutting edge arranged on the guide portion, and a threaded rod arranged on the threaded cutting edge. The temporomandibular joint disc reduction nail is made of a titanium alloy material. The temporomandibular joint disc resetting nail penetrates through a reset joint disc and is implanted into the bone cortex of a condylar process, so that the purpose of fixing the reset joint disc is achieved, the special temporomandibular joint disc resetting nail is provided with a section of polished rod part, namely, a certain smooth distance is formed between the threaded part and the top cap end, and the polished rod part is used for fixing the reset joint disc. And the thickness of the posterior belt of the temporomandibular joint disc can be just accommodated, so that the temporomandibular joint disc reduction nail is prevented from pressing the joint disc. The surgical suture operation is few, the stripping range is small, an anchoring line in the traditional technology is not needed, and the surgery is safer.

Description

Technical Field

[0001] The utility model relates to a medical device accessory, in particular to a temporomandibular joint disc resetting nail. Background Art

[0002] The temporomandibular joint (TMJ) is a pair of small joints located in front of the ear. It is responsible for daily functions such as eating and talking, and is a joint with relatively frequent body movements. It is composed of a concave joint socket on the top, a cartilage in the middle, also known as a joint disc, a protruding condyle on the bottom, and surrounding joint ligaments and muscles. Among them, there are elastic fibers in the double plate area at the back of the joint disc. The elastic fibers at the back are similar to soft tendons and play a role in fixing the normal position of the joint disc.

[0003] The most common TMJ disease is the anterior displacement of the articular disc. The articular disc in a normal position covers the "head" of the condyle like a "hat", playing a protective role. The displaced "hat" cannot protect the "condylar head". The main reason is that the anteriorly displaced articular disc blocks the normal sliding movement of the condyle. In this process, the "hat" may be squeezed, deformed, and perforated, and the "condylar head" may be worn and absorbed. Especially in adolescents, the "condylar head" is not fully developed and is more easily absorbed. In this case, if the disease occurs on one side, facial deviation will occur, and if it occurs on both sides, the mandibular retraction will occur, resulting in a "short chin".

[0004] For this type of disease, it is of great significance to properly reposition the articular disc, restore the normal movement function of the joint, and avoid condylar bone degeneration.

[0005] This surgery is mainly to loosen the anterior attachment of the articular disc, fix it to the outer and posterior part of the condyle with a wire anchor nail, and then suture the disc with a mattress. It is the most commonly used surgical method in clinical practice. That is, an anchor nail with an anchor wire is placed on the condyle neck, and then the anchor wire fixes the articular disc and the anchor nail placed in the condyle, so as to restore the normal position of the articular disc and the condyle.

[0006] However, this type of surgery involves many suturing operations and is difficult (especially for beginners). In addition, the peeling range is large, which can easily damage the facial nerve. The anchoring wire on the anchoring nail is not absorbable, and the human body is prone to rejection. Summary of the invention

[0007] The utility model aims to provide a temporomandibular joint disc reduction nail to solve the problems raised in the above background technology.

[0008] In order to solve the above technical problems, the utility model is realized by the following technical measures: a temporomandibular joint disc reduction nail, which includes a nail cap, a smooth rod portion is provided in front of the nail cap, a threaded portion is provided in front of the smooth rod portion, a conical guide portion is provided in front of the threaded portion, and a threaded cutting edge is provided on the guide portion. The material of the temporomandibular joint disc reduction nail is titanium alloy material; the surface roughness of the nail cap portion is less than 0.4 microns, the surface roughness of the threaded portion is less than 3.2 microns, and the surface roughness of the remaining parts is less than 1.6 microns. The purpose of selecting this design: because the temporomandibular joint disc reduction nail is finally in the human body, it has a high finish and is not easy to cause damage.

[0009] Compared with the prior art, the utility model has the advantages that: through the temporomandibular joint disc reduction nail, the reduced joint disc is passed through and implanted into the bone cortex of the condyle, thereby achieving the purpose of fixing the reduced joint disc, wherein the special temporomandibular joint disc reduction nail has a smooth rod portion, that is, there is a certain smooth distance from its threaded portion to the top cap end, which can just accommodate the thickness of the posterior band of the temporomandibular joint disc, thereby avoiding the temporomandibular joint disc reduction nail from compressing the joint disc. This surgical suturing operation is less, the stripping range is smaller, and the anchor line in the traditional technology is not required, making the operation safer.

[0010] As an improvement of the utility model, the rounded corner of the front meshing corner of the threaded part is R1, and the range of R1 is 0.2-0.5 mm; the rounded corner of the rear meshing corner of the threaded part is R2, and the range of R2 is 0.05-0.15 mm. The purpose of selecting this design is to ensure the strength of the thread teeth of the threaded part.

[0011] As an improvement of the utility model, the nail cap is provided with a cross groove for rotational force. The purpose of selecting this design is to screw in a screwdriver through the cross groove.

[0012] As an improvement of the utility model, the angle of the thread edge is a right-angle edge shape. The purpose of selecting this design is to form a ventilation channel, maintain the balance of internal and external air pressure, and prevent excessive pressure from being generated inside.

[0013] As an improvement of the utility model, the hardness of the temporomandibular joint disc reduction nail is greater than 260HV10. The purpose of selecting this design is to ensure the strength of the temporomandibular joint disc reduction nail. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0015] In the attached picture:

[0016] Figure 1 The utility model is a schematic diagram of the position of the temporomandibular joint disc reduction nail in the temporomandibular joint.

[0017] Figure 2 The figure is a schematic diagram of the position of the conventional anchoring nail in the temporomandibular joint according to the utility model.

[0018] Figure 3 The utility model is a front view and a right view of the temporomandibular joint disc reduction nail.

[0019] Figure 4 It is the AA cross-sectional view described in the present utility model.

[0020] Figure 5 It is an enlarged view of part B described in the present utility model.

[0021] Explanation of the reference numerals: 1. nail cap; 2. bare rod portion; 3. threaded portion; 4. guide portion; 5. threaded cutting edge; 6. cross groove; 7. temporomandibular joint disc reduction nail; 8. joint disc; 9. condyle; 10. posterior band; 11. anchoring line; 12. anchoring nail. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0023] Example 1

[0024] Please refer to Figure 1 -5, a temporomandibular joint disc reduction nail provided in this embodiment comprises a nail cap 1, a polished rod portion 2 is provided in front of the nail cap 1, a threaded portion 3 is provided in front of the polished rod portion 2, a conical guide portion 4 is provided in front of the threaded portion 3, and the nail cap 1, the polished rod portion 2, the threaded portion 3 and the guide portion 4 are integrally formed. The material of the temporomandibular joint disc reduction nail 7 is titanium alloy material.

[0025] In the embodiments of the present utility model application, please refer to Figure 4 The guide portion 4 is provided with a threaded edge 5, and the angle of the threaded edge 5 is a right-angled edge shape. When the temporomandibular joint disc reduction nail 7 is screwed in, the threaded edge 5 can form a ventilation channel to maintain the balance of internal and external air pressures, and no excessive pressure will be generated inside. At the same time, the thread starting point is also set at this position.

[0026] In the embodiments of the present utility model application, please refer to Figure 3The nail cap 1 is provided with a cross groove 6 for rotational force. When working, the cross groove 6 is pressed with a screwdriver to screw in. It should be noted that such groove shapes include but are not limited to a straight shape, a cross shape, and the like.

[0027] In the embodiments of the present utility model application, please refer to Figure 3 and Figure 5 The surface roughness of the nail cap 1 is less than 0.4 microns, the surface roughness of the threaded portion 3 is less than 3.2 microns, and the surface roughness of the remaining parts is less than 1.6 microns. This is because the temporomandibular joint disc reduction nail 7 is always in the human body, so it is required to have a high finish and is not easy to cause harm to the human body.

[0028] In the embodiment of the utility model application, the fillet of the front meshing corner of the threaded portion 3 is R1, R1 is 0.3 mm, the fillet of the rear meshing corner of the threaded portion 3 is R2, R2 is 0.1 mm, and the hardness of the temporomandibular joint disc reduction nail 7 is greater than 260HV10. These are to ensure the strength of the temporomandibular joint disc reduction nail 7 and prevent medical accidents due to quality problems after implantation into the human body.

[0029] The present embodiment provides a temporomandibular joint disc reduction nail 7, and the specific operation process is as follows:

[0030] 1: After successful puncture using temporomandibular arthroscopy, the superior joint cavity is examined through the first sleeve. After a comprehensive understanding of the joint lesions, the arthroscope is placed in the anterior recess of the superior joint cavity.

[0031] 2: Puncture the anterior recess in the skin below the joint tubercle, and then use the radiofrequency ablation device through the second sleeve to complete the release of the anterior attachment of the articular disc 8 in the anterior recess under direct vision of the arthroscope. After the release is completed, a blunt-tipped puncture needle is inserted into the tendon release site, and the articular disc 8 is pushed backward and upward to reposition it, and observe whether the articular disc 8 is completely repositioned and the difficulty of repositioning.

[0032] 3: Puncture the posterior recess at the skin 5mm in front of the tragus. Under direct vision of the arthroscope, place the third cannula on the posterior and lateral sides of the reduced articular disc 8 and condyle 9. Pass the temporomandibular joint disc reduction nail 7 through the third cannula and then implant it into the bone cortex of the condyle 9, so as to fix the reduced articular disc 8. Note that the nail cap 1 should be slightly higher than the surface of the articular disc 8 and cannot penetrate the articular disc 8. The length C of the smooth rod 2 from the top of the thread to the top cap of this special temporomandibular joint disc reduction nail 7 can just accommodate the thickness of the posterior band 10 on the temporomandibular joint disc 8, so as to avoid the reduction nail from pressing the articular disc 8.

[0033] This new arthroscopic reduction method using 7 nails for temporomandibular joint disc reduction surgery is the same as the traditional suture reduction surgery method. The difference lies in step 3. Please refer to Figure 2 The traditional suture reduction surgery requires implanting the anchor pin 12 with the anchor line 11, and 6 puncture operations are required to complete the 2-needle mattress suture. The operation is relatively complicated, the peeling surface is large, and the operation time is long. The new reduction nail reduction surgery only requires one puncture operation. The articular disc 8 is fixed on the bone cortex of the condyle 9 after the temporomandibular joint disc reduction nail 7 passes through the articular disc 8, which makes the operation simpler and the operation time shorter.

[0034] The beneficial effects of the utility model are: through the temporomandibular joint disc reduction nail 7, the reduced joint disc 8 is passed through and implanted into the bone cortex of the condyle 9, so as to achieve the purpose of fixing the reduced joint disc 8. This surgical procedure requires fewer suturing operations, a smaller stripping range, and does not require the anchoring line 11 in traditional technology, making the surgery safer.

[0035] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 on the present invention.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A temporomandibular joint disc reduction nail, characterized by: The invention comprises a nail cap (1), a smooth rod portion (2) is arranged in front of the nail cap (1), a threaded portion (3) is arranged in front of the smooth rod portion (2), a conical guide portion (4) is arranged in front of the threaded portion (3), and a threaded cutting edge (5) is arranged on the guide portion (4). In a working state, the guide portion (4) passes through an articular disc (8) and is then fixed inside a condyle (9); the surface roughness of the nail cap (1) is less than 0.4 microns, the surface roughness of the threaded portion (3) is less than 3.2 microns, and the surface roughness of the remaining parts is less than 1.6 microns.

2. The temporomandibular joint disc reduction nail according to claim 1, characterized in that The rounded corner of the front meshing corner of the threaded portion (3) is R1, and the range of R1 is 0.2-0.5 mm; the rounded corner of the rear meshing corner of the threaded portion (3) is R2, and the range of R2 is 0.05-0.15 mm.

3. The temporomandibular joint disc reduction nail according to claim 1, characterized in that: The nail cap (1) is provided with a cross groove (6) for rotationally receiving force.

4. The temporomandibular joint disc reduction nail according to claim 1, characterized in that: The angle of the thread cutting edge (5) is a right-angle cutting edge shape.

5. The temporomandibular joint disc reduction nail according to claim 1, characterized in that: The hardness of the temporomandibular joint disc reduction nail (7) is greater than 260HV10.

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