Mandibular reconstruction bracket

Abstract

The present invention discloses a mandibular reconstruction bracket, which is an irregular structure, including a first section and a second section; wherein the oblique angle between the first section and the second section is 30-60 degrees; at least one first nail hole is respectively provided on both sides of the first section, and the first nail hole passes through the first section and a second section, and is used to fix the mandibular reconstruction bracket on a first target object; at least one second nail hole is provided on the first section, and is used to fix the mandibular reconstruction bracket on a second target object. The mandibular reconstruction bracket of the present invention can reconstruct the mandible by means of composite vascularized bone transplantation, and can effectively reduce the occurrence of serious complications such as infection, rejection, and stress shielding caused by reconstruction of the mandible with all-heterogeneous materials.

Description

Technical Field

[0001] The invention relates to the technical field of oral and maxillofacial restoration and reconstruction, and in particular to a mandibular reconstruction bracket. Background Art

[0002] Vascularized autologous bone transplantation: Currently, this method is widely used for mandibular reconstruction, mainly including fibula and ilium. However, the vertical height of the fibula is insufficient, making it difficult to complete dental implants at the same time, and the horizontal length of the ilium is insufficient, making it impossible to use it for large mandibular defects across the midline. Some teams have used fibula double overlap, Onlay bone grafting or distraction osteogenesis to increase vertical bone volume, but such methods not only increase the trauma to the donor site, but also increase the difficulty of surgery and treatment cycle, and increase the pain of patients.

[0003] Reconstruction of mandible with all-heterogeneous materials: As 3D printing technology becomes more and more mature, methods for applying all-heterogeneous prostheses to bone reconstruction emerge in an endless stream, and titanium, as the element with the best biocompatibility, has received widespread attention. However, regardless of the excellent physical and chemical properties of various materials or the perfection of 3D printing technology, it is impossible to avoid the fate of infection, exposure, and eventual removal of implants after mandibular reconstruction with all-heterogeneous materials. The main reason is that the oral cavity is a bacterial environment (class II wound), the oral mucosa is thin, and tight suture of soft tissue cannot be performed, resulting in saliva leakage, and all-heterogeneous prostheses have no anti-infection ability, leading to rejection of infection. At the same time, the design of the heterogeneous prosthesis does not take into account the biomechanical state of the mandible. Under the action of strong chewing force, stress shielding is obvious, which leads to absorption of surrounding bones and loosening and falling off of titanium nails.

[0004] Therefore, there is an urgent need to provide a mandibular reconstruction bracket to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a mandibular reconstruction bracket that conforms to the biomechanical distribution of the mandibular bone and can also guide the placement of the transplanted bone above the mandibular reconstruction bracket to jointly reconstruct the mandibular bone and replace the defective mandibular bone. The reconstructed mandibular bone has good anti-infection properties and is also conducive to dental implantation. The use of the bracket of the present invention can reduce bone absorption caused by stress shielding, thereby reducing the occurrence of complications such as transplanted bone fracture.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a mandibular reconstruction bracket, which is an irregular structure, including a first section and a second section; wherein the oblique angle between the first section and the second section is 30 to 60 degrees; at least one first nail hole is respectively provided on both sides of the first section, and the first nail hole passes through the first section and a second section, and is used to fix the mandibular reconstruction bracket on a first target object; at least one second nail hole is provided on the first section, and is used to fix the mandibular reconstruction bracket on a second target object.

[0007] Furthermore, the first cross section also includes a hollow design area, and the hollow design area is provided with at least one hollow hole to facilitate the attachment of the mylohyoid bone, masseter and other jaw-elevating and jaw-depressing muscles to restore the power of the mandible.

[0008] Furthermore, the first target object is a mandibular stump.

[0009] Furthermore, the second target object is a transplanted bone.

[0010] Furthermore, the mandibular reconstruction bracket is provided with an inner side surface which fits with the lower end of the transplanted bone, which is beneficial for the mandibular reconstruction bracket to fully contact with the transplanted bone.

[0011] Furthermore, the lower edge of the mandibular reconstruction bracket conforms to the anatomical shape of the lower edge of the mandibular bone.

[0012] Furthermore, the edge of the mandibular reconstruction bracket is designed to be rounded to avoid being too sharp and damaging surrounding soft tissues.

[0013] Furthermore, the mandibular reconstruction bracket is made of titanium metal.

[0014] In the present invention, titanium nails can pass through the first nail hole and the second nail hole and are fixed to the mandibular stump and the transplanted bone respectively.

[0015] In the present invention, the hollow design area is arranged in an area close to the lower edge of the mandibular reconstruction support.

[0016] In one embodiment of the present invention, the shape of the hollow hole, for example but not limited to, is an elliptical shape.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1) The mandibular reconstruction scaffold of the present invention can replace the lower part of the defective mandible and is mainly distributed along the muscle force trajectory. As the main load-bearing area of ​​the mandible, it can effectively reduce the occurrence of serious complications such as infection, rejection, and stress shielding caused by reconstruction of the mandible with all heterogeneous materials.

[0019] 2) The mandibular reconstruction scaffold of the present invention is a biomechanical mandibular reconstruction scaffold based on vascularized bone transplantation. The scaffold conforms to the biomechanical distribution of the mandible, reconstructs the mandible by means of composite vascularized bone transplantation, guides the upper transplanted bone (fibula) into place, and reduces the demand for donor bone transplantation. The reconstructed mandible is divided into two parts, the upper layer is the vascularized transplanted bone, which is in direct contact with the mucosa, can effectively prevent microleakage, has strong anti-infection ability, and is conducive to implantation; the lower layer is a mandibular reconstruction scaffold that conforms to biomechanics, which is mainly distributed along the muscle force trajectory and is the main load-bearing area of ​​the mandible. The mandible reconstructed using the scaffold and transplanted bone of the present invention can reduce bone absorption caused by stress shielding, thereby reducing the occurrence of complications such as implant fracture.

[0020] 3) The present invention uses double tension screws to fix the mandibular reconstruction bracket and the mandibular stump, which is closer to the biomechanical distribution of the mandibular bone. The traditional mandibular rigid fixation method often uses titanium plates for fixation, but it often produces a large stress shielding phenomenon, resulting in the eventual breakage of the titanium plate.

[0021] 4) The lower part of the mandibular reconstruction bracket of the present invention is a stress blank zone, which is hollowed out, which not only ensures the strength of the mandibular reconstruction bracket and the stress distribution of the mandible, but also helps the attachment of the jaw lifting and lowering muscles, which is beneficial to the dynamic function reconstruction of the mandible.

[0022] 5) The porous design of the mandibular reconstruction scaffold of the present invention can increase the contact area with the mandibular stump, while promoting bone integration, which is beneficial to the immediate load-bearing of the prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view schematic diagram of the mandibular reconstruction bracket of the present invention;

[0024] Figure 2 is a schematic top view of the mandibular reconstruction bracket of the present invention;

[0025] Figure 3 It is a side view schematic diagram of the mandibular reconstruction bracket of the present invention being fitted with the transplanted bone;

[0026] Figure 4 It is a three-dimensional schematic diagram of the mandibular reconstruction bracket of the present invention in use;

[0027] Figure 5 It is a schematic top view of the mandibular reconstruction bracket of the present invention in use.

[0028] The numbers in the figure are:

[0029] 1. First section;

[0030] 2. Second section;

[0031] 3. Medial side;

[0032] 10. Bone transplantation;

[0033] 11. Hollow holes;

[0034] 12. First nail hole;

[0035] 13. Second nail hole;

[0036] 14. Lower edge;

[0037] 20. Mandibular stump. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] Example 1

[0040] This embodiment provides a mandibular reconstruction bracket, referring to Figures 1 to 3 The mandibular reconstruction bracket is an irregular structure, including a first section 1 and a second section 2; wherein the oblique angle between the first section 1 and the second section 2 is 30 to 60 degrees. At least one first nail hole 12 is respectively provided on both sides of the first section 1, and the first nail hole 12 passes through the first section 1 and the second section 2, and is used to fix the mandibular reconstruction bracket on a first target object; at least one second nail hole 13 is provided on the first section 1, and is used to fix the mandibular reconstruction bracket on a second target object.

[0041] The first section 1 also includes a hollow design area, and the hollow design area is provided with at least one hollow hole 11, which is conducive to the attachment of the mylohyoid bone, masseter and other jaw lifting and depressing muscles, and restores the power of mandibular reconstruction. The first target is the mandibular stump 20; the second target is the transplanted bone 10. The mandibular reconstruction bracket is provided with an inner side surface 3 that fits the lower end of the transplanted bone 10, which is conducive to the mandibular reconstruction bracket and the transplanted bone 10 Full contact.

[0042] The lower edge 14 of the mandibular reconstruction bracket conforms to the anatomical shape of the lower edge of the mandibular bone. The edge of the mandibular reconstruction bracket is rounded to avoid being too sharp and damaging the surrounding soft tissue. The material of the mandibular reconstruction bracket is titanium metal.

[0043] This embodiment provides a specific application of the mandibular reconstruction bracket of the present invention in oral and maxillofacial repair and reconstruction surgery, such as Figures 3 to 5 As shown, a composite vascularized bone transplantation method is used to reconstruct the mandible of the patient using the mandibular reconstruction scaffold of the present invention and the transplanted bone 10, as follows:

[0044] When the doctor performs surgery, the first nail hole 12 on the mandibular reconstruction bracket can be used as the drilling position, and then the mandibular reconstruction bracket can be fixed to the mandibular stump 20 using titanium nails; similarly, the mandibular reconstruction bracket can be fixed to the transplanted bone 10 using the second nail hole 13 and titanium nails to guide the transplanted bone 10 into position and jointly reconstruct the mandible. The mandibular reconstruction bracket is provided with an inner side surface 3 that fits with the lower end of the transplanted bone 10, so that the mandibular reconstruction bracket is in full contact with the transplanted bone 10. The combination of the mandibular reconstruction bracket, the surface of the transplanted bone 10 and the mandibular stump 20 is conducive to a more uniform stress distribution of the reconstructed mandible. The hollow design in the mandibular reconstruction bracket is conducive to the attachment of the mylohyoid bone, masseter and other jaw-raising and jaw-depressing muscles, helping to restore power to the reconstructed mandible.

[0045] The mandibular reconstruction bracket of the present invention complies with the mandibular biomechanics and does not damage surrounding soft tissues. The reconstructed mandibular bone not only has good infection resistance, but is also conducive to dental implantation.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A mandibular reconstruction scaffold, characterized in that: The mandibular reconstruction bracket is an irregular structure, and the mandibular reconstruction bracket comprises a first section (1) and a second section (2); wherein the oblique angle between the first section (1) and the second section (2) is 30-60 degrees; at least one first nail hole (12) is respectively arranged on both sides of the first section (1), and the first nail hole (12) passes through the first section (1) and the second section (2), and is used to fix the mandibular reconstruction bracket on a first target object; at least one second nail hole (13) is arranged on the first section (1), and is used to fix the mandibular reconstruction bracket on a second target object, and the The first target object is a mandibular stump (20), the second target object is a transplanted bone (10), the first nail hole (12) and the second nail hole (13) are capable of passing titanium nails and fixing the mandibular stump (20) and the transplanted bone (10) respectively, the second section (2) is opposite to the end face of the mandibular stump (20); the lower edge of the first section (1) also includes a hollow design area, the hollow design area is provided with at least one hollow hole (11) which is conducive to the attachment of the muscles of raising and lowering the jaw, the edge of the mandibular reconstruction bracket is rounded, and the material of the mandibular reconstruction bracket is titanium metal.

2. The mandibular reconstruction scaffold according to claim 1, characterized in that: The mandibular reconstruction bracket is provided with an inner side surface (3) which is in contact with the lower end of the transplanted bone (10), which is conducive to the mandibular reconstruction bracket and the transplanted bone (10) to fully contact.

3. The mandibular reconstruction scaffold according to claim 1, characterized in that: The lower edge (14) of the mandibular reconstruction bracket conforms to the anatomical shape of the lower edge of the mandibular bone.

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