Clamping and holding type mandibular angle defect repair prosthesis

Abstract

The invention provides a clamping type mandibular angle defect repair prosthesis. The clamping type mandibular angle defect repair prosthesis comprises a main body, a connecting part and an outer oblique line fixing part, the main body is used for filling a defective mandibular angle part; the connecting part extends in the front-back direction of the mandibular ramus and is arranged on the outer side of the mandibular ramus, one end of the connecting part is connected with the main body, and the other end of the connecting part is connected with the outer oblique line fixing part; the outer oblique line fixing part is used for being arranged on an outer oblique line part of a mandible; wherein the main body and the outer oblique line fixing part are configured to be clamped at a target implantation part through the connecting part based on elasticity. According to the configuration, through the arrangement of the connecting part and the outer oblique line fixing part, clamping type connection with the main body is formed, installation is convenient, fixation is reliable, arrangement of bone nails can be reduced or avoided, and the possibility of nerve injury is reduced. Due to the fact that clamping type connection is adopted, a tiling type overlapping fixing part can be omitted, and the lower face part cannot be widened.

Description

Technical Field

[0001] The present invention relates to the technical field of medical implantation, and particularly relates to a clamping-type mandibular angle defect repair prosthesis. Background Art

[0002] The mandibular angle is the two angles at the rear of the mandible. Mandibular angle defects can be repaired by implanting a repair prosthesis. The customized polyetheretherketone (PEEK) repair prosthesis based on the patient's mandibular bone scan data has the advantages of relatively high precision in matching the patient's design, good fit with the bone surface, and strong hardness and is not easy to break, and has been widely used in the repair of the maxillofacial region, especially mandibular angle defects.

[0003] As Figure 1 shown, in order to achieve the stability after implantation, in addition to directly repairing the missing mandibular angle part 01, the existing repair prosthesis often needs to additionally set a lapped fixing part 02 at the position of the outer plate in the adjacent area. The lapped fixing part 02 partially overlaps on the outside of the patient's existing mandible, so the thickness of the outer plate after surgery is increased. This results in obvious widening of the entire lower face after the repair prosthesis is implanted, leading to poor patient satisfaction.

[0004] Furthermore, the existing repair prosthesis needs to be fixed by bone nails 03, and the positions available for fixing the bone nails 03 are relatively demanding, often located near the mandibular nerve canal or in the blind field of vision (such as the posterior edge of the mandibular ramus). On the one hand, the fixation of the bone nails 03 has the risk of nerve injury. On the other hand, for the positions in the blind field of vision, an assistant buccal perforator is required for fixation, which is difficult to fix and is prone to poor fixation. Summary of the Invention

[0005] The purpose of the present invention is to provide a clamping-type mandibular angle defect repair prosthesis to solve the problems of difficult fixation of the existing mandibular angle defect repair prosthesis and affecting the appearance of the lower face.

[0006] To solve the above technical problems, the present invention provides a clamping-type mandibular angle defect repair prosthesis, which 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 part; the connecting part extends along the front-back direction of the mandibular ramus and is arranged on the outside 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 arranged on the external oblique line part of the mandible; wherein, the main body and the external oblique line fixing part are configured to be elastically clamped to the target implantation site through the connecting part.

[0007] Optionally, the external oblique line fixing part has fixing points.

[0008] Optionally, the clamping type mandibular angle defect repair prosthesis also includes bone screws, and the bone screws are used to be penetrated and fixed at the fixed point to fix the external oblique line fixing part at the external oblique line position.

[0009] Optionally, the main body and the outer oblique fixing portion extend downward from the connecting portion respectively and synchronously, and the extension lengths of the main body and the outer oblique fixing portion match.

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

[0011] Optionally, the main body, the connecting portion and the external oblique fixing portion are all made of polyetheretherketone material.

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

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

[0014] Optionally, when the main body of the clamping-type mandibular angle defect repair prosthesis is clamped in the target implantation site, the outer side surface of the main body is flush with the existing mandibular bone.

[0015] Optionally, the main body, the connecting portion and the external oblique fixing portion are individually adapted to the shape of the existing mandible.

[0016] In summary, the clamping type mandibular angle defect repair prosthesis provided by the present invention includes: a main body, a connecting part and an external oblique fixing part; the main body is used to fill the defective mandibular angle part; the connecting part is extended along the anterior-posterior direction of the mandibular ramus and is arranged on the outer 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 fixing part; the external oblique fixing part is used to be arranged on the external oblique part of the mandible; wherein, the main body and the external oblique fixing part are configured to be based on elasticity and clamped to the target implantation site through the connecting part.

[0017] With such configuration, the connection part and the external oblique fixing part are arranged to form a clamping connection with the main body, and the entire repair prosthesis can be reliably clamped and fixed on the mandible, which is convenient to install and reliably fixed, and can reduce or avoid the setting of bone screws, which is conducive to reducing injuries and the possibility of nerve damage. Furthermore, due to the clamping connection, the overlapping fixing part of the tile-type can be eliminated, and the lower face will not be widened. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Those of ordinary skill in the art will understand that the provided drawings are for better understanding of the present invention and do not constitute any limitation to the scope of the present invention.

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

[0020] Figure 2 is a front view of the clamping type mandibular angle defect repair prosthesis and its application scenario according to an embodiment of the present invention.

[0021] Figure 3 is a side view of the clamping type mandibular angle defect repair prosthesis and its application scenario according to an embodiment of the present invention.

[0022] Figure 4 is a rear view of the clamping type mandibular angle defect repair prosthesis and its application scenario according to an embodiment of the present invention.

[0023] Figure 5 is a bottom view of the clamping type mandibular angle defect repair prosthesis and its application scenario according to an embodiment of the present invention.

[0024] Figure 6 is a view in the obliquely forward direction of the clamping type mandibular angle defect repair prosthesis and its application scenario according to an embodiment of the present invention.

[0025] In the drawings: 01 - mandibular angle part; 02 - overlapping fixing part; 03 - bone nail; 1 - main body; 2 - connecting part; 3 - external oblique line fixing part; 41 - mandibular angle area; 42 - ascending ramus of mandible; 43 - external oblique line area. Detailed Embodiments

[0026] To make the objectives, advantages and features of the present invention clearer, the following further describes the present invention in detail with reference to the drawings and specific embodiments. It should be noted that the drawings are in very simplified forms and are not drawn to scale, only for conveniently and clearly assisting in explaining the objectives of the embodiments of the present invention. In addition, the structures shown in the drawings are often part of the actual structures. In particular, the focus that each drawing needs to show is different, and sometimes different scales are used.

[0027] As used in the present invention, the singular forms "a", "an", "one" and "the" include plural referents. The term "or" is generally used in the sense of including "and / or". The term "several" is generally used in the sense of including "at least one". The term "at least two" is generally used in the sense of including "two or more". In addition, the terms "first", "second", "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "third" may explicitly or implicitly include one or at least two of such features. "One end" and "the other end", and "proximal end" and "distal end" generally refer to corresponding two parts, which include not only the endpoints. In addition, as used in the present invention, "mounted", "connected", "coupled", an element "disposed" on another element should be understood in a broad sense, generally only indicating a connection, coupling, cooperation or transmission relationship between two elements, and the two elements may be directly or indirectly connected, coupled, cooperated or transmitted through an intermediate element, and should not be construed as indicating or implying the spatial position relationship between the two elements, that is, an element may be inside, outside, above, below or on one side of another element in any orientation, unless the content clearly indicates otherwise. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, directional terms such as above, below, up, down, upward, downward, left, right, front, back are used relative to an exemplary embodiment as shown in the figures. The upward or up direction is towards the top of the corresponding figure, and the downward or down direction is towards the bottom of the corresponding figure. When the directional terms are used relative to a human body looking straight ahead, they express their orientation relative to the human body.

[0028] The object of the present invention is to provide a clamping type mandibular angle defect repair prosthesis to solve the problems of difficult fixation of the existing mandibular angle defect repair prosthesis and affecting the appearance of the lower face. The following is a description with reference to the accompanying drawings.

[0029] As described in the background technology, the existing prosthesis has the problems of difficult fixation and widening after fixation, which affects the appearance of the lower face. The inventors have found that the emergence of these two problems is due to the structure and installation method of the existing prosthesis. Since the mandibular angle defect is facing downward, the installation direction of the existing prosthesis is from bottom to top. Although the prosthesis has a relative accuracy designed to match the patient, it is in a state of relative blindness from bottom to top during actual operation and has no accurate target embedding position. During implantation, the prosthesis still has a certain degree of sliding forward and backward along the bone surface. At this time, it is difficult for the operator to determine whether the prosthesis has been placed in the correct position. During the postoperative CT review, it was found that the prosthesis was deviated from the target position. Furthermore, since the installation direction is from bottom to top, if the bone screw is not fixed properly (such as the screw is not fixed perpendicular to the bone surface), and the gravity factor is superimposed, the prosthesis is prone to fall, so that there is a gap between the prosthesis and the bone surface, resulting in a long-term prosthesis. The risk of falling off.

[0030] In order to overcome the problems of the existing prosthesis, the embodiment of the present invention provides a clamping type mandibular angle defect prosthesis, which includes: 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 part 41; the connecting part 2 is along the front-back direction of the mandibular ramus 42 ( Figure 2 The connecting portion 2 is extended in the left and right directions on the outside of the mandibular ramus 42, one end of the connecting portion 2 is connected to the main body 1, and the other end of the connecting portion 2 is connected to the external oblique fixing portion 3; the external oblique fixing portion 3 is used to be arranged on the external oblique part 43 of the mandible; wherein, the main body 1 and the external oblique fixing portion 3 are configured to be based on elasticity and are clamped to the target implantation site through the connecting portion 2.

[0031] The inventors further studied the anatomical structure of the mandible and found that the mandible has an external oblique line 43, which is a bone ridge running obliquely from the front and bottom to the back and top, and the bone ridge has a certain angle with the extension direction (roughly extending in the vertical direction) of the mandibular ramus 42. Therefore, it can be considered to use this bone ridge to fix the prosthesis by clamping.

[0032] Based on the above research, in the clamping type mandibular angle defect repair prosthesis provided by the 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 the design requirements. The shape of the external oblique fixing part 3 matches the outer surface of the bone ridge of the external oblique part 43, and it can be attached to the external oblique part 43. The connecting part 2 is roughly arranged in the middle part of the mandibular ramus 42, and its extension direction is along the front-back direction, that is, extending from the front edge A of the mandibular ramus 42 to the rear edge B (see Figure 3), and is preferably located at the shortest front-to-back distance of the mandibular ramus 42. It should be noted that the connecting portion 2 here extends along the front-to-back direction of the mandibular ramus 42, which does not limit the connecting portion 2 to strictly extend along the front-to-back direction of the horizontal plane, but should be broadly understood as forming a certain angle with the horizontal plane, and extending roughly along the front-to-back edge of the anatomical structure of the mandibular ramus 42. In addition, the connecting portion 2 extends along the front-to-back direction of the mandibular ramus 42, which does not limit it to extending along a straight line, but should be broadly understood as having a certain curvature, bend or twist.

[0033] With such configuration, since the extension direction of the bone ridge of the external oblique line portion 43 and the side (vertical side) where the rear edge B of the mandibular ramus 42 is located approximately form an acute angle, through the setting of the connecting portion 2 and the external oblique line fixing portion 3, a clamping connection is formed with the main body 1, and the entire repair prosthesis can be reliably clamped and fixed on the mandible, which is convenient to install and reliable to fix, and can reduce or avoid the setting of bone screws, which is conducive to reducing injuries and reducing the possibility of nerve damage. Further, due to the use of the clamping connection, the overlapping fixing portion of the tile-type can be eliminated, and the lower face will not be widened.

[0034] Preferably, the main body 1 and the external oblique fixing portion 3 extend downward from the connecting portion 2 synchronously, and the extension lengths of the main body 1 and the external oblique fixing portion 3 match. In a preferred example, the tops of the main body 1 and the external oblique fixing portion 3 both terminate at the connecting portion 2, that is, the three form a roughly "冂" shape. The extension lengths of the main body 1 and the external oblique fixing portion 3 can be roughly understood as their farthest extension distance relative to the connecting portion 2. For example, a central axis can be fitted along the center of the extension direction of the connecting portion 2, and the central axis extends and intersects with the main body 1 and the external oblique fixing portion 3 respectively, with the intersection of the central axis with the main body 1 and the external oblique fixing portion 3 (that is, the front edge A and the rear edge B of the mandibular ramus 42) as the starting point, and the extension lengths of the main body 1 and the external oblique fixing portion 3 are roughly matched, so that the force of the entire clamp-type mandibular angle defect repair prosthesis is relatively balanced, thereby improving the stability of retention. It should be noted that matching the extension lengths does not strictly limit the extension lengths of the two to be exactly the same, but should be broadly understood as being roughly the same, roughly on the same order of magnitude, and an error of several millimeters or centimeters may exist.

[0035] Optionally, both the connecting portion 2 and the external oblique line fixing portion 3 are configured as sheet-like members to reduce the impact on the external shape of the facial region. Preferably, the main body 1, the connecting portion 2, and the external oblique line fixing portion 3 are all made of polyetheretherketone (PEEK) material components, and the main body 1, the connecting portion 2, and the external oblique line fixing portion 3 are personalized to fit the shape of the existing mandible. In practical applications, the main body 1, the connecting portion 2, and the external oblique line fixing portion 3 can be designed individually according to the scan data of the mandible of the implantation object and manufactured by means such as 3D printing, so as to fit the existing mandible of the implantation object. Preferably, the main body 1, the connecting portion 2, and the external oblique line fixing portion 3 are configured as integrally formed components to improve the connection strength among the three. Of course, in some other embodiments, the main body 1, the connecting portion 2, and the external oblique line fixing portion 3 can also be formed independently and then fixedly connected together by means such as welding, fusion welding, or bonding.

[0036] Optionally, when the prosthetic body for repairing mandibular angle defect with clamping type clamps on the target implantation site, the outer side surface of the main body 1 is flush with the existing mandible, so as to further reduce the possibility of the lower face becoming wider after implantation.

[0037] Furthermore, please refer to Figure 6 , the external oblique line fixing portion 3 includes two wings 30 at an angle, and the two wings 30 are respectively used to abut against the top surface and the side surface of the external oblique line portion 43. It can be understood that for the prosthetic body for repairing mandibular angle defect with clamping type in this embodiment, the main force-bearing part for clamping is the external oblique line fixing portion 3, and widening the external oblique line fixing portion 3 is beneficial to improving the stability. However, the external oblique line fixing portion 3 cannot be widened arbitrarily because the width of the top surface of the external oblique line portion 43 is limited. Therefore, preferably, the external oblique line fixing portion 3 can be configured to include two wings 30, and one of the wings 30 is abutted against the side surface of the external oblique line portion 43 adjacent to the top surface, so as to further increase the force-bearing surface of the clamping and improve the clamping stability.

[0038] Preferably, the clamping type mandibular angle defect repair prosthesis is configured to be clamped and installed from the front to the back of the mandible, and a clamping and positioning sound is generated when it is clamped to the target implantation site. The inventor's research found that the mandible gradually widens in the front-to-back direction at the external oblique line part 43 and the bottom surface. Therefore, it can be understood that the distance between the main body 1 of the clamping type mandibular angle defect repair prosthesis and the external oblique line fixing part 3 actually matches the widest part of the mandible. Therefore, the entire clamping type mandibular angle defect repair prosthesis can be conveniently installed in place from the front to the back of the mandible. Further, since the extension length of the connecting part 2 preferably matches the shortest front-to-back 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 line fixing part 3 need to be over-expanded compared to the unloaded default state in order to 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 line fixing part 3 will suddenly switch to the default state, and a clamping and positioning sound such as a "click" will be emitted, indicating that the clamping type mandibular angle defect repair prosthesis has been installed and clamped in place.

[0039] It can be understood that when the main body 1, the connecting part 2, and the external oblique line fixing part 3 are accurately designed and the clamping installation is in place, there is actually no need for additional bone screws to fix the clamping type 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, etc., can be reserved on the external oblique line fixing part 3. Further, the clamping type mandibular angle defect repair prosthesis further includes bone screws, and the bone screws are used to be fixedly inserted into the fixing points to fix the external oblique line fixing part 3 to the external oblique line part. The bone screws can be titanium screws and other commonly used bone fixing screws in the art. Its specific structure and fixing method can refer to the prior art, and this embodiment will not be elaborated. It should be understood that the external oblique line fixing part 3 with fixing points (such as positioning holes) is not limited to being fixed by bone screws. In practice, the operator can evaluate the firmness and reliability of the clamping. If it is already reliable enough, there is no need to additionally insert bone screws.

[0040] In this embodiment, the fixing points are set on the external oblique line fixing part 3, corresponding to the external oblique line part 43 of the mandible. By taking full advantage of the anatomical characteristics of the external oblique line part 43, such as hard bone quality and far distance from the mandibular nerve canal, a safe and reliable bone screw insertion effect can be obtained, and the external oblique line part 43 faces upward and outward anatomically, which is convenient for the operator to operate.

[0041] In summary, the clamping-type mandibular angle defect repair prosthesis provided by the present invention includes: a main body, a connecting portion, and an external oblique line fixing portion; the main body is used to fill the defective mandibular angle portion; the connecting portion extends along the front-back direction of the mandibular ramus and is disposed outside 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 clamped to the target implantation site through the connecting portion based on elasticity. With such a configuration, through the arrangement of the connecting portion and the external oblique line fixing portion, a clamping connection is formed with the main body, and the entire repair prosthesis can be reliably clamped and fixed on the mandible, with convenient installation and reliable fixation, which can reduce or avoid the setting of bone nails, is beneficial to reducing harm and reducing the possibility of nerve injury. Further, due to the adoption of the clamping connection, the overlapping fixing portion of the overlapping type can be cancelled, and the lower face will not be widened.

[0042] It should be noted that the above-mentioned several embodiments can be combined with each other. The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the field of the present invention according to the above disclosure are within the protection scope of the present invention.

Claims

1. A clamping type mandibular angle defect repair prosthesis, characterized in that, include: A main body, a connecting part and an external oblique fixing part; the main body is used to fill the defective mandibular angle part; the connecting part extends along the anterior-posterior direction of the mandibular ramus and is arranged on the outside 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 fixing part; the external oblique fixing part is used to be arranged on the external oblique part of the mandible; wherein, the main body and the external oblique fixing part are configured to be based on elasticity and are clamped to the target implantation site through the connecting part.

2. The clamping mandibular angle defect repair prosthesis according to claim 1, wherein The outer oblique line fixing portion has a fixing point.

3. The clamping type mandibular angle defect repair prosthesis according to claim 2, wherein The clamping type mandibular angle defect repair prosthesis also includes bone screws, and the bone screws are used to be penetrated and fixed at the fixed point to fix the external oblique line fixing part at the external oblique line position.

4. The clamping type mandibular angle defect repair prosthesis according to claim 1, wherein The main body and the outer oblique fixing portion extend downward from the connecting portion respectively and synchronously, and the extension lengths of the main body and the outer oblique fixing portion match each other.

5. The clamping type mandibular angle defect repair prosthesis according to claim 1, characterized in that, The external oblique line fixing portion comprises two angled wings, and the two wings are used to abut against the top surface and the side surface of the external oblique line portion respectively.

6. The clamping-type mandibular angle defect repair prosthesis according to claim 1, wherein The main body, the connecting portion and the outer oblique fixing portion are all made of polyetheretherketone material.

7. The clamping type mandibular angle defect repair prosthesis according to claim 1, wherein The main body, the connecting portion, and the outer oblique fixing portion are configured as an integrally formed component.

8. The clamping type mandibular angle defect repair prosthesis according to claim 1, characterized in that The snap-on mandibular angle defect repair prosthesis is configured to be snap-fitted and installed from the front to the back of the mandible, and to produce a snap-fitting sound when snapping into place at the target implantation site.

9. The clamping type mandibular angle defect repair prosthesis according to claim 1, wherein When the main body of the clamping-type mandibular angle defect repair prosthesis is clamped in the target implantation site, the outer side surface of the main body is flush with the existing mandibular bone.

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

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