Clasping mandibular angle defect repair prosthesis

Abstract

The utility model provides a kind of card holds jaw angle defect repair prosthesis, it includes: main body, connecting portion and outer oblique line fixed part;The main body is used to fill in the defect of mandibular angle part;The connecting portion is set to the outside of the mandibular ramus along the front-back direction of the mandibular ramus, one end of the connecting portion is connected with the main body, the other end of the connecting portion is connected with the outer oblique line fixed part;The outer oblique line fixed part is used to be set on the outer oblique line part of mandible;Wherein, the main body and the outer oblique line fixed part are configured to be based on elasticity, by the connecting portion card holds target implant site.It is thus configured, by the setting of connecting portion and outer oblique line fixed part, form card holds type connection with main body, installation is convenient, fixed reliably, can reduce or avoid the setting of bone screw, reduce the possibility of nerve damage.Due to the adoption of card holds type connection, the overlapping fixed part of wa can be cancelled, and the lower part will not be widened.

Description

Technical Field

[0001] This utility model relates to the field of medical implant technology, and in particular to a snap-fit ​​mandibular angle defect repair prosthesis. Background Technology

[0002] The mandibular angles are the two angles at the back of the mandible. Defects in the mandibular angles can be repaired by implanting prostheses. Customized polyetheretherketone (PEEK) prostheses based on the patient's mandibular bone scan data have advantages such as relative precision in matching the patient's design, good fit to the bone surface, and high rigidity that makes them less prone to breakage. They have been widely used in the maxillofacial region, especially for the repair of mandibular angle defects.

[0003] like Figure 1 As shown, to achieve stability after implantation, existing prostheses, besides directly repairing the missing mandibular angle (01), often require an additional overlapping fixation section (02) located in the adjacent outer plate area. This overlapping fixation section (02) partially overlaps the patient's existing mandible on the lateral side, thus increasing the thickness of the outer plate post-operatively. This results in a significant widening of the entire lower portion of the prosthesis after implantation, leading to poor patient satisfaction.

[0004] Furthermore, existing prostheses require fixation with bone screw 03, but the locations available for fixation with bone screw 03 are quite restrictive. They are often located close to the mandibular nerve canal or in visual field blind spots (such as the posterior border of the mandibular ramus). Fixation with bone screw 03 carries the risk of nerve damage, and in visual field blind spots, it requires the assistance of a cheek piercing device for fixation, making fixation difficult and prone to poor fixation. Utility Model Content

[0005] The purpose of this invention is to provide a snap-fit ​​mandibular angle defect repair prosthesis to solve the problems of existing mandibular angle defect repair prostheses being difficult to fix and affecting the appearance of the lower face.

[0006] To address the aforementioned technical problems, this utility model provides a snap-fit ​​mandibular angle defect repair prosthesis, comprising: a main body, a connecting portion, and an external oblique line fixing portion; the main body is used to fill the defective mandibular angle area; the connecting portion extends along the anteroposterior direction of the mandibular ramus and is disposed on the lateral side of the mandibular ramus, one end of the connecting portion is connected to the main body, and the other end of the connecting portion is connected to the external oblique line fixing portion; the external oblique line fixing portion is used to be disposed on the external oblique line portion of the mandible; wherein, the main body and the external oblique line fixing portion are configured to be elastically snapped into the target implantation site by the connecting portion.

[0007] Optionally, the outer oblique line fixing part has a fixed point.

[0008] Optionally, the snap-fit ​​mandibular angle defect repair prosthesis further includes bone screws, which are used to pass through and fix the fixation point to fix the external oblique line fixation part to the external oblique line part.

[0009] Optionally, the main body and the outer oblique line fixing part extend downward synchronously from the connecting part, and the extension lengths of the main body and the outer oblique line fixing part are matched.

[0010] Optionally, the outer oblique line fixing part includes two angled wings, which are respectively used to abut against the top surface and side surface of the outer oblique line part.

[0011] Optionally, the main body, the connecting part, and the outer oblique line fixing part are all polyetheretherketone (PEEK) material components.

[0012] Optionally, the main body, the connecting portion, and the outer oblique line fixing portion are configured as an integrally molded component.

[0013] Optionally, the snap-fit ​​mandibular angle defect repair prosthesis is configured to snap into place from the front to the back of the mandible and produce a snapping sound when snapped into place at the target implantation site.

[0014] Optionally, when the main body of the mandibular angle defect repair prosthesis is clamped onto the target implantation site, the outer surface of the main body is flush with the existing mandible.

[0015] Optionally, the main body, the connecting part, and the external oblique line fixing part can be customized to fit the shape of the existing mandible.

[0016] In summary, the snap-fit ​​mandibular angle defect repair prosthesis provided by this utility model includes: a main body, a connecting part, and an external oblique line fixing part; the main body is used to fill the defective mandibular angle area; the connecting part extends along the anteroposterior direction of the mandibular ramus and is disposed on the lateral side of the mandibular ramus, one end of the connecting part is connected to the main body, and the other end of the connecting part is connected to the external oblique line fixing part; the external oblique line fixing part is used to be disposed on the external oblique line of the mandible; wherein, the main body and the external oblique line fixing part are configured to be elastically snapped into the target implantation site by the connecting part.

[0017] This configuration, through the connection and external oblique fixation parts, forms a snap-fit ​​connection with the main body, allowing the entire prosthesis to be reliably snapped and fixed to the mandible. This facilitates installation, ensures reliable fixation, and reduces or eliminates the need for bone screws, thus minimizing injury and the possibility of nerve damage. Furthermore, the snap-fit ​​connection eliminates the need for overlapping, interlocking fixation parts, preventing widening of the lower face. Attached Figure Description

[0018] Those skilled in the art will understand that the accompanying drawings are provided to better understand the present invention and do not constitute any limitation on the scope of the present invention.

[0019] Figure 1 This is a schematic diagram of a mandibular angle defect repair prosthesis and its application scenarios.

[0020] Figure 2 This is a front view of the snap-fit ​​mandibular angle defect repair prosthesis and its application scenarios according to an embodiment of this utility model.

[0021] Figure 3 This is a side view of the snap-fit ​​mandibular angle defect repair prosthesis and its application scenarios according to an embodiment of this utility model.

[0022] Figure 4 This is a rear view of the snap-fit ​​mandibular angle defect repair prosthesis and its application scenarios according to an embodiment of this utility model.

[0023] Figure 5 This is a bottom view of the snap-fit ​​mandibular angle defect repair prosthesis and its application scenarios according to an embodiment of this utility model.

[0024] Figure 6 This is a frontal view of the mandibular angle defect repair prosthesis and its application scenarios according to an embodiment of this utility model.

[0025] In the attached diagram: 01-Mandibular angle; 02-Overlapping fixation part; 03-Bone screw; 1-Main body; 2-Connecting part; 3-External oblique line fixation part; 41-Mandibular angle region; 42-Mandibular ramus; 43-External oblique line region. Detailed Implementation

[0026] To make the objectives, advantages, and features of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clarify the explanation of the objectives of the embodiments of this utility model. Furthermore, the structures shown in the drawings are often part of the actual structure. In particular, different drawings may emphasize different aspects and sometimes use different scales.

[0027] As used in this invention, the singular forms “a,” “an,” “one,” and “the” include plural objects; the term “or” is generally used to mean “and / or”; the term “a number” is generally used to mean “at least one”; and the term “at least two” is generally used to mean “two or more”. Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first,” “second,” or “third” may explicitly or implicitly include one or at least two of that feature; “one end” and “the other end,” and “proximal end” and “distal end” generally refer to two corresponding parts, which include not only endpoints. Furthermore, the terms "installed," "connected," and "attached," as used in this utility model, and the phrase "set" of one element on another, should be interpreted broadly. They generally only indicate a connection, coupling, cooperation, or transmission relationship between the two elements, which can be direct or indirect through an intermediate element. They should not be construed as indicating or implying a spatial positional relationship between the two elements, meaning one element can be located inside, outside, above, below, or to one side of another element, unless otherwise explicitly stated. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances. Additionally, directional terms such as above, below, up, down, upward, downward, left, right, front, and back are used relative to exemplary embodiments as shown in the figures. "Up" or "above" refers to the top of the corresponding figure, and "down" or "below" refers to the bottom of the corresponding figure. When directional terms are used relative to a person looking straight ahead, they express the orientation relative to the person.

[0028] The purpose of this invention is to provide a snap-fit ​​mandibular angle defect repair prosthesis to solve the problems of existing mandibular angle defect repair prostheses being difficult to fix and affecting the appearance of the lower face. The following description refers to the accompanying drawings.

[0029] As described in the background section, existing prostheses suffer from difficulties in fixation and widening after fixation, affecting the appearance of the lower face. The inventors have discovered that both problems stem from the structure and placement method of existing prostheses. Because the mandibular angle defect faces downwards, existing prostheses are placed from bottom to top. Although the prosthesis has a relatively high degree of precision in matching the patient's design, the actual procedure is performed in a relatively blind manner from bottom to top, without a precise target insertion position. During implantation, the prosthesis still has some posterior-posterior sliding mobility along the bone surface, making it difficult for the operator to determine if the prosthesis has been placed in the correct position. Postoperative CT scans reveal deviations between the prosthesis and the target position. Furthermore, because the placement direction is from bottom to top, if the bone screws are not properly fixed (e.g., the screws are not perpendicular to the bone surface), combined with gravity, the prosthesis is prone to sagging, creating a gap between the prosthesis and the bone surface, leading to a risk of long-term prosthesis dislodgement.

[0030] To overcome the problems of existing mandibular angle repair prostheses, this utility model provides a snap-fit ​​mandibular angle defect repair prosthesis, comprising: a main body 1, a connecting part 2, and an external oblique fixing part 3; the main body 1 is used to fill the defective mandibular angle region 41; the connecting part 2 is located along the anterior-posterior direction of the mandibular ascending ramus 42 ( Figure 2 The connecting part 2 extends to the lateral side of the mandibular ramus 42 in the left-right direction. One end of the connecting part 2 is connected to the main body 1, and the other end of the connecting part 2 is connected to the external oblique line fixing part 3. The external oblique line fixing part 3 is used to be disposed on the external oblique line portion 43 of the mandible. The main body 1 and the external oblique line fixing part 3 are configured to be elastic and held in place at the target implantation site by the connecting part 2.

[0031] Further research into the anatomical structure of the mandible revealed the presence of an external oblique ridge 43, which is an oblique bony ridge running from the lower front to the upper back. This ridge forms an angle with the extension direction of the mandibular ramus 42 (extending roughly vertically). Therefore, this ridge could be utilized to fix the prosthesis in a snap-fit ​​manner.

[0032] Based on the above research, in the mandibular angle defect repair prosthesis provided in this embodiment of the present invention, the main body 1 is the component actually used to repair the mandibular angle defect, and its shape can be set according to design requirements. The shape of the external oblique line fixing part 3 matches the outer surface of the bony ridge of the external oblique line part 43, and it can abut against the external oblique line part 43. The connecting part 2 is generally deployed in the middle part of the mandibular ramus 42, and its extension direction is along the anterior-posterior direction, that is, from the anterior edge A of the mandibular ramus 42 to the posterior edge B (see...). Figure 3(As shown), and preferably located at the point where the anterior-posterior distance of the mandibular ramus 42 is shortest. It should be noted that the extension of the connecting portion 2 along the anterior-posterior direction of the mandibular ramus 42 does not imply that the connecting portion 2 must strictly extend anterior-posteriorly along the horizontal plane, but should be broadly understood as being able to form a certain angle with the horizontal plane, extending approximately along the anterior-posterior edge of the anatomical structure of the mandibular ramus 42. Furthermore, the extension of the connecting portion 2 along the anterior-posterior direction of the mandibular ramus 42 does not imply that it must extend in a straight line, but should be broadly understood as being able to have a certain degree of curvature, bending, or twisting.

[0033] With this configuration, since the extension direction of the bony ridge of the external oblique line portion 43 forms an acute angle with the side (vertical side) where the posterior edge B of the mandibular ramus 42 is located, a snap-fit ​​connection is formed together with the main body 1 through the setting of the connecting part 2 and the external oblique line fixing part 3. The entire prosthesis can be reliably snap-fitted and fixed to the mandible, which is convenient for installation and reliable for fixation. It can reduce or avoid the setting of bone screws, which helps to reduce injury and the possibility of nerve damage. Furthermore, since the snap-fit ​​connection is adopted, the overlapping fixation part of the interlocking type can be eliminated, and it will not cause widening of the lower face.

[0034] Preferably, the main body 1 and the external oblique line fixing part 3 extend downward synchronously from the connecting part 2, and the extension lengths of the main body 1 and the external oblique line fixing part 3 are matched. In a preferred example, the tops of the main body 1 and the external oblique line fixing part 3 both terminate at the connecting part 2, that is, the three form an approximate "U" shape. The extension lengths of the main body 1 and the external oblique line fixing part 3 can be roughly understood as their farthest extension distance relative to the connecting part 2. For example, a central axis can be fitted along the center of the extension direction of the connecting part 2, which extends and intersects the main body 1 and the external oblique line fixing part 3 respectively. Taking the intersection points of this central axis with the main body 1 and the external oblique line fixing part 3 (i.e., the anterior edge A and posterior edge B of the mandibular ramus 42) as the starting points, the extension lengths of the main body 1 and the external oblique line fixing part 3 are approximately matched, so that the force on the entire snap-fit ​​mandibular angle defect repair prosthesis is relatively balanced, improving the stability of retention. It should be noted that matching the extension lengths does not strictly limit the two extension lengths to be exactly the same, but should be understood broadly as being roughly the same, roughly on the same order of magnitude, with an error of a few millimeters or centimeters.

[0035] Optionally, both the connecting portion 2 and the external oblique fixation portion 3 are configured as sheet-like parts to reduce the impact on the external morphology of the face. Preferably, the main body 1, connecting portion 2, and external oblique fixation portion 3 are all made of polyetheretherketone (PEEK) material, and are individually adapted to the shape of the existing mandible. In practical applications, the main body 1, connecting portion 2, and external oblique fixation portion 3 can be individually designed based on the scanning data of the implanted object's mandible and manufactured using methods such as 3D printing to adapt to the existing mandible of the implanted object. Preferably, the main body 1, connecting portion 2, and external oblique fixation portion 3 are configured as a single molded component to improve the connection strength of the three. Of course, in other embodiments, the main body 1, connecting portion 2, and external oblique fixation portion 3 can also be molded independently and then fixed together by methods such as welding, fusion, or bonding.

[0036] Optionally, when the main body of the mandibular angle defect repair prosthesis is positioned at the target implantation site, the outer surface of the main body 1 is flush with the existing mandible. This further reduces the possibility of facial widening after implantation.

[0037] For further details, please refer to... Figure 6 The outer oblique line fixing part 3 includes two angled wings 30, which are respectively used to abut against the top surface and side surface of the outer oblique line portion 43. It is understood that in this embodiment of the snap-fit ​​mandibular angle defect repair prosthesis, the main force-bearing part of the snap-fit ​​is the outer oblique line fixing part 3, and widening the outer oblique line fixing part 3 is beneficial to improving stability. However, the outer oblique line fixing part 3 cannot be arbitrarily widened because the width of the top surface of the outer oblique line portion 43 is limited. Therefore, preferably, the outer oblique line fixing part 3 can be configured to include two wings 30, with one wing 30 abutting against the side surface of the outer oblique line portion 43 adjacent to the top surface, thereby further increasing the force-bearing surface of the snap-fit ​​and improving the stability of the snap-fit.

[0038] Preferably, the snap-fit ​​mandibular angle defect repair prosthesis is configured to snap into place from the front to the back of the mandible, producing a snapping sound when snapped into place at the target implantation site. The inventors have discovered that the mandible gradually widens from front to back at the outer oblique portion 43 and the bottom surface. Therefore, it is understandable that the distance between the main body 1 of the snap-fit ​​mandibular angle defect repair prosthesis and the outer oblique fixation portion 3 actually matches the widest part of the mandible. Thus, the entire snap-fit ​​mandibular angle defect repair prosthesis can be conveniently installed from the front to the back of the mandible. Furthermore, since the extension length of the connecting part 2 is preferably matched to the shortest anterior-posterior distance of the mandibular ramus 42, during the installation process from the front to the back of the mandible, the main body 1 and the external oblique fixation part 3 need to be stretched excessively beyond the default state before they can cross the widest position of the existing mandibular angle part 41. After crossing the widest position of the existing mandibular angle part 41, the main body 1 and the external oblique fixation part 3 will suddenly turn towards the default state, and a "click" sound will be emitted, indicating that the snap-fit ​​mandibular angle defect repair prosthesis has been installed and snapped into place.

[0039] It is understandable that, if the main body 1, connecting part 2, and external oblique line fixing part 3 are accurately designed and properly installed, additional bone screws are not actually required for additional fixation of the snap-fit ​​mandibular angle defect repair prosthesis. However, optionally, the external oblique line fixing part 3 has fixing points (not shown). In some embodiments, several fixing points for bone screws to pass through, such as positioning holes, can be reserved on the external oblique line fixing part 3. Furthermore, the snap-fit ​​mandibular angle defect repair prosthesis also includes bone screws, which are used to pass through and fix the external oblique line fixing part 3 to the external oblique line portion. The bone screws can be commonly used bone fixation screws in the art, such as titanium screws. The specific structure and fixation method can be referred to the prior art, and will not be described in detail in this embodiment. It should be understood that the external oblique line fixing part 3 with fixing points (such as positioning holes) is not limited to fixation by bone screws. In practice, the operator can assess the firmness and reliability of the snap-fit. If it is already reliable enough, it is not necessary to insert additional bone screws.

[0040] In this embodiment, the fixation point is set at the external oblique fixation part 3, corresponding to the external oblique part 43 of the mandible. By making full use of the hard bone of the external oblique part 43 and its anatomical characteristics of being far from the mandibular nerve canal, a safe and reliable bone screw insertion effect can be obtained. Moreover, the external oblique part 43 is anatomically oriented upward and outward, which is convenient for the operator to operate.

[0041] In summary, the snap-fit ​​mandibular angle defect repair prosthesis provided by this utility model includes: a main body, a connecting part, and an external oblique line fixing part; the main body is used to fill the defective mandibular angle area; the connecting part extends along the anteroposterior direction of the mandibular ramus and is disposed on the lateral side of the mandibular ramus, one end of the connecting part is connected to the main body, and the other end of the connecting part is connected to the external oblique line fixing part; the external oblique line fixing part is used to be disposed on the external oblique line of the mandible; wherein, the main body and the external oblique line fixing part are configured to be elastic, snap-fitted to the target implantation site by the connecting part. With this configuration, the connecting part and the external oblique line fixing part form a snap-fit ​​connection with the main body, and the entire repair prosthesis can be reliably snap-fitted and fixed to the mandible, which is convenient to install, reliable in fixation, and can reduce or avoid the use of bone screws, thus reducing the risk of injury and nerve damage. Furthermore, due to the snap-fit ​​connection, the overlapping fixation part can be eliminated, preventing widening of the lower face.

[0042] It should be noted that the above embodiments can be combined with each other. The above description is only a description of preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the present utility model.

Claims

1. A snap-fit ​​mandibular angle defect repair prosthesis, characterized in that, include: The device comprises a main body, a connecting portion, and an external oblique line fixing portion; the main body is used to fill the defective mandibular angle region; the connecting portion extends along the anteroposterior direction of the mandibular ramus and is disposed on the lateral side of the mandibular ramus, one end of the connecting portion is connected to the main body, and the other end of the connecting portion is connected to the external oblique line fixing portion; the external oblique line fixing portion is used to be disposed on the external oblique line region of the mandible; wherein, the main body and the external oblique line fixing portion are configured to be elastically held in place at the target implantation site by means of the connecting portion.

2. The mandibular angle defect repair prosthesis according to claim 1, characterized in that, The outer oblique line fixing part has a fixed point.

3. The mandibular angle defect repair prosthesis according to claim 2, characterized in that, The snap-fit ​​mandibular angle defect repair prosthesis also includes bone screws, which are used to be inserted and fixed at the fixation point to fix the external oblique line fixation part to the external oblique line part.

4. The mandibular angle defect repair prosthesis according to claim 1, characterized in that, The main body and the outer oblique line fixing part extend downward synchronously from the connecting part, and the extension lengths of the main body and the outer oblique line fixing part are matched.

5. The mandibular angle defect repair prosthesis according to claim 1, characterized in that, The outer oblique line fixing part includes two angled wings, which are respectively used to abut against the top surface and side surface of the outer oblique line part.

6. The mandibular angle defect repair prosthesis according to claim 1, characterized in that, The main body, the connecting part, and the outer oblique line fixing part are all made of polyetheretherketone material.

7. The mandibular angle defect repair prosthesis according to claim 1, characterized in that, The main body, the connecting part, and the outer oblique line fixing part are configured as an integrally molded component.

8. The mandibular angle defect repair prosthesis according to claim 1, characterized in that, The snap-fit ​​mandibular angle defect repair prosthesis is configured to snap into place from the front to the back of the mandible and produce a snapping sound when snapped into place at the target implantation site.

9. The mandibular angle defect repair prosthesis according to claim 1, characterized in that, When the main body of the mandibular angle defect repair prosthesis is held in place at the target implantation site, the outer surface of the main body is flush with the existing mandible.

10. The mandibular angle defect repair prosthesis according to claim 1, characterized in that, The main body, the connecting part, and the external oblique line fixing part are individually adapted to the shape of the existing mandible.

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