Temporomandibular joint disc reduction nail

Abstract

The utility model discloses a kind of temporomandibular joint disc reset nails, it includes wedge section and anchoring section, the wedge section has fixedly connected cylindrical portion and triangular pyramid portion;The anchoring section is perpendicular to the wedge section, and the middle part of the anchoring section is fixedly connected with the end of the cylindrical portion away from the triangular pyramid portion, the anchoring section and the wedge section form T-shaped structure.The beneficial effects of the utility model are: the temporomandibular joint disc reset nail of the utility model, contact with anchoring section and joint disc, the contact area is larger, stress dispersion, and the fixing force is stronger, and the lateral force is better.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a temporomandibular joint disc repositioning screw. Background Technology

[0002] The temporal-mandibular joint (TMJ) is a pair of small, interconnected joints located in front of the ears. It is responsible for daily functions such as eating and speaking, and is one of the most frequently moved joints in the body. It consists of a concave glenoid fossa above, a cartilaginous disc in the middle, a convex condyle below, and surrounding ligaments and muscles. Behind the glenoid disc, there are elastic fibers in the double-plate area that provide traction. These posterior elastic fibers, similar to tendons, play a stabilizing role in the normal position of the glenoid disc.

[0003] The most common TMJ disease is anterior displacement of the articular disc. Normally, the articular disc acts like a "cap" over the "head" of the condyle, providing protection. A displaced "cap" fails to protect the "head of the condyle," primarily because the anteriorly displaced disc obstructs the normal gliding movement of the condyle. During this process, the "cap" may be compressed, deformed, or perforated, and the "head of the condyle" may wear down and be absorbed, especially in adolescents whose "head of the condyle" is not fully developed and is more prone to absorption. In such cases, if one side is affected, facial asymmetry will occur; if both sides are affected, mandibular retrusion will result in a "short chin."

[0004] For this type of disease, properly repositioning the articular disc to restore normal joint function and prevent condylar degeneration is of great significance. This surgery primarily involves releasing the anterior attachments of the articular disc, fixing it to the posterolateral aspect of the condyle with a suture anchor, and then suturing the disc with mattress sutures. This is currently the most commonly used surgical method in clinical practice. An anchor with an anchor suture is placed on the condylar neck, and the anchor suture then fixes the articular disc and the anchor into the condyle, thereby restoring the normal position of the articular disc and condyle. However, this surgery involves numerous suturing operations, is difficult, and involves a large dissection area, which can easily damage the facial nerve. Furthermore, the anchor suture on the anchor is non-absorbable, which can easily cause rejection in the body. There are also methods that use repositioning screws to directly fix the articular disc and condyle (such as the temporomandibular joint disc repositioning screw disclosed in application number 202420720151.3), but the contact area between the screw head and the articular disc is limited, approximately 12.5 mm², posing a risk of stress concentration. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a temporomandibular joint disc repositioning screw, which solves the technical problem that the contact area between the screw head and the joint disc is limited when the repositioning screw is used to directly fix the joint disc and condyle in the prior art, resulting in the risk of stress concentration.

[0006] To achieve the above technical objectives, the present invention provides a temporomandibular joint disc repositioning screw, comprising: The wedge section has a fixedly connected cylindrical portion and a triangular pyramidal portion; An anchoring section, which is perpendicular to the wedge section, and the middle part of the anchoring section is fixedly connected to the end of the cylindrical part away from the triangular pyramid part, and the anchoring section and the wedge section form a T-shaped structure.

[0007] Furthermore, the temporomandibular joint disc repositioning screw also includes multiple protrusions, each of which is disposed opposite to both sides of the wedge section and is fixedly connected to the anchoring section. Each of the protrusions is located outside the joint disc and is used to contact the joint disc.

[0008] Furthermore, the anchoring section is provided with multiple biocompatible microporous structures.

[0009] Furthermore, the temporomandibular joint disc repositioning screw also includes a coating applied to the root of the T-shaped structure formed by the anchoring section and the wedge section.

[0010] Furthermore, the coating is made of bioceramic material.

[0011] Furthermore, the diameter of the cylindrical portion is 1 mm.

[0012] Furthermore, the length of the anchoring section is 2mm-4mm.

[0013] Furthermore, the thickness of the anchoring section is 0.5 mm.

[0014] Furthermore, the thickness of the protrusion is 0.5 mm.

[0015] Furthermore, the pore size of the micropores is 100-200 μm.

[0016] Compared with the prior art, the beneficial effects of this utility model include: during use, a posterior recess puncture is performed 5mm in front of the tragus. Under arthroscopic visualization, the wedging segment of the temporomandibular joint disc repositioning screw is inserted through the joint disc and then implanted into the condylar cortex. The anchoring segment of the temporomandibular joint disc repositioning screw remains outside the joint disc and contacts the joint disc, thereby achieving the purpose of fixing the repositioned joint disc. When the wedging segment is implanted into the condylar cortex, one edge of the triangular pyramid part needs to face forward, so as to ensure that the edge is opposite to the direction of movement of the joint disc, reducing the risk of tearing. Compared with existing temporomandibular joint disc repositioning screws, this temporomandibular joint disc repositioning screw uses an anchoring segment that contacts the joint disc, resulting in a larger contact area, stress dispersion, stronger fixation force, and better resistance to lateral forces. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a temporomandibular joint disc repositioning screw provided by this utility model; Figure 2 This is a top view of a temporomandibular joint disc repositioning screw provided by this utility model; Figure 3 This is a bottom view of the wedge section provided by this utility model; In the diagram: 100 - wedge section, 110 - cylindrical part, 120 - triangular pyramid part, 200 - anchoring section, 300 - protrusion. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0019] This utility model provides a temporomandibular joint disc repositioning screw, the structure of which is as follows: Figure 1 and Figure 2 As shown, it includes a wedge section 100 and an anchoring section 200. The wedge section 100 has a cylindrical portion 110 and a triangular pyramidal portion 120 that are fixedly connected. The anchoring section 200 is perpendicular to the wedge section 100, and the middle part of the anchoring section 200 is fixedly connected to the end of the cylindrical portion 110 away from the triangular pyramidal portion 120. The anchoring section 200 and the wedge section 100 form a T-shaped structure.

[0020] In practice, the first step is as follows: After successful puncture using temporomandibular arthroscopy, the arthroscope is first examined through the first sleeve to fully understand the joint lesion. Then, the arthroscope is placed in the anterior recess of the superior joint cavity. The second step involves puncturing the anterior recess in the skin below the articular tuberosity. Then, under direct arthroscopic visualization, a radiofrequency ablation device is used through the second sleeve to release the anterior attachments of the articular disc in the anterior recess. After release, a blunt-tipped needle is inserted into the released tendon site to push the articular disc posteriorly and superiorly to reposition it. The complete repositioning of the articular disc and the ease of repositioning are then observed. Step 3: Perform a posterior recess puncture 5mm anterior to the tragus. Under arthroscopic visualization, place the third cannula on the posterolateral side of the repositioned articular disc and condyle. Through the third cannula, insert the wedging segment 100 of the temporomandibular joint disc repositioning screw through the disc and then implant it into the condylar cortex. The anchoring segment 200 of the temporomandibular joint disc repositioning screw remains outside the disc and in contact with it, thereby achieving the purpose of fixing the repositioned disc. The wedging segment 100, implanted into the condylar cortex, needs to maintain the triangular pyramid shape. One edge of part 120 faces forward, ensuring that the edge moves in the opposite direction to the joint disc, reducing the risk of tearing. This new arthroscopic temporomandibular joint disc repositioning screw method is the same as the traditional suture repositioning method in the first and second steps. The difference lies in the third step. Compared with existing temporomandibular joint disc repositioning screws, this temporomandibular joint disc repositioning screw uses the anchoring section 200 to contact the joint disc, resulting in a larger contact area, stress dispersion, stronger fixation, and better resistance to lateral forces.

[0021] As a preferred embodiment, please refer to Figure 1 The temporomandibular joint disc repositioning screw further includes multiple protrusions 300, each of which is disposed opposite to both sides of the wedge section 100 and is fixedly connected to the anchoring section 200. Each of the protrusions 300 is located outside the joint disc and is used to contact the joint disc, thereby further increasing the contact area, strengthening the fixation force, and improving the resistance to lateral forces.

[0022] In a preferred embodiment, the anchoring section 200 is provided with multiple biocompatible microporous structures to facilitate the fusion of the joint disc and the anchoring section 200 and improve the connection strength.

[0023] As a preferred embodiment, the temporomandibular joint disc repositioning screw further includes a coating applied to the root of the T-shaped structure formed by the anchoring segment 200 and the wedging segment 100, suitable for patients with osteoporosis.

[0024] As a preferred embodiment, the coating is made of bioceramic material, suitable for patients with osteoporosis.

[0025] In a preferred embodiment, the diameter of the cylindrical portion 110 is 1 mm, which can reduce the puncture wound and reduce patient pain while meeting the puncture requirements.

[0026] In a preferred embodiment, the length of the anchoring section 200 is 2mm-4mm, which can increase the contact area with the articular disc while ensuring patient comfort.

[0027] In a preferred embodiment, the anchoring section 200 has a thickness of 0.5 mm to ensure its strength.

[0028] In a preferred embodiment, the thickness of the protrusion 300 is 0.5 mm, which increases the contact area while ensuring patient comfort.

[0029] In a preferred embodiment, the pore size of the micropores is 100-200 μm to ensure fusion effect.

[0030] To better understand this utility model, the following is combined with... Figure 1 - Figure 3 The working principle of the technical solution of this utility model will be described in detail below: In practice, the first step is as follows: After successful puncture using temporomandibular arthroscopy, the arthroscope is first examined through the first sleeve to fully understand the joint lesion. Then, the arthroscope is placed in the anterior recess of the superior joint cavity. The second step involves puncturing the anterior recess in the skin below the articular tuberosity. Then, under direct arthroscopic visualization, a radiofrequency ablation device is used through the second sleeve to release the anterior attachments of the articular disc in the anterior recess. After release, a blunt-tipped needle is inserted into the released tendon site to push the articular disc posteriorly and superiorly to reposition it. The complete repositioning of the articular disc and the ease of repositioning are then observed. Step 3: A posterior recess puncture is performed 5 mm anterior to the tragus. Under arthroscopic visualization, the third cannula is placed on the posterolateral aspect of the repositioned articular disc and condyle. The wedging segment 100 of the temporomandibular joint disc repositioning screw is inserted through the third cannula through the articular disc and then implanted into the condylar cortex. The anchoring segment 200 of the temporomandibular joint disc repositioning screw remains outside the articular disc and in contact with it. Each protrusion 300 of the temporomandibular joint disc repositioning screw remains outside the articular disc and is used to contact it, thereby achieving the purpose of fixing the repositioned articular disc. The wedging segment 100 is implanted into the condyle. For the protruding cortical bone, one edge of the triangular pyramidal portion 120 needs to face forward to ensure that the edge is opposite to the direction of movement of the articular disc, reducing the risk of tearing. This new arthroscopic temporomandibular joint disc repositioning screw method is the same as the traditional suture repositioning method in the first and second steps. The difference lies in the third step. Compared with existing temporomandibular joint disc repositioning screws, this temporomandibular joint disc repositioning screw uses the anchoring section 200 and multiple protrusions 300 to contact the articular disc, resulting in a larger contact area, stress dispersion, stronger fixation force, and better resistance to lateral forces.

[0031] The temporomandibular joint disc repositioning screw provided by this utility model has the following beneficial effects: (1) When the lower end of the wedge segment 100 of the temporomandibular joint disc repositioning nail passes through the joint disc and is implanted into the condyle, it is necessary to keep one edge of the triangular pyramid portion 120 facing the front of the human body, so as to ensure that the edge is opposite to the movement direction of the joint disc and reduce the risk of tearing. (2) In this temporomandibular joint disc repositioning screw, each of the protrusions 300 is placed outside the joint disc and is used to contact the joint disc, further increasing the contact area, strengthening the fixation force, and improving the resistance to lateral forces; (3) The temporomandibular joint disc repositioning nail uses the anchoring section 200 to contact the joint disc, resulting in a larger contact area, stress dispersion, stronger fixation force, and better resistance to lateral forces.

[0032] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A temporomandibular joint disc repositioning screw, characterized in that, include: The wedge section has a fixedly connected cylindrical portion and a triangular pyramidal portion; An anchoring section, which is perpendicular to the wedge section, and the middle part of the anchoring section is fixedly connected to the end of the cylindrical part away from the triangular pyramid part, and the anchoring section and the wedge section form a T-shaped structure.

2. The temporomandibular joint disc repositioning screw according to claim 1, characterized in that, It also includes multiple protrusions, each of which is disposed opposite to both sides of the wedge section and is fixedly connected to the anchoring section. Each of the protrusions is located outside the joint disc and is used to contact the joint disc.

3. The temporomandibular joint disc repositioning screw according to claim 1, characterized in that, The anchoring section has multiple biocompatible microporous structures.

4. The temporomandibular joint disc repositioning screw according to claim 1, characterized in that, It also includes a coating applied to the root of the T-shaped structure formed by the anchoring section and the wedge section.

5. The temporomandibular joint disc repositioning screw according to claim 4, characterized in that, The coating is made of bioceramic material.

6. The temporomandibular joint disc repositioning screw according to claim 1, characterized in that, The diameter of the cylindrical portion is 1 mm.

7. The temporomandibular joint disc repositioning screw according to claim 1, characterized in that, The length of the anchoring section is 2mm-4mm.

8. The temporomandibular joint disc repositioning screw according to claim 1, characterized in that, The thickness of the anchoring section is 0.5 mm.

9. The temporomandibular joint disc repositioning screw according to claim 2, characterized in that, The thickness of the protrusion is 0.5 mm.

10. The temporomandibular joint disc repositioning screw according to claim 3, characterized in that, The pore size of the micropores is 100-200 μm.

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