Bonding and nerve protection guide plate for sagittal splitting of mandible

Abstract

The utility model discloses a boning and nerve protection guide plate for lower jawbone sagittal splitting, and belongs to the field of medical instruments in surgical operations. Comprising a fixing part used for being fixed to the lower jawbone and a positioning part used for positioning the boning position, and the fixing part and the positioning part are integrally formed; a positioning hole is formed in the positioning part, an osteotomy guide surface and a nerve protection guide surface are arranged on the side wall of the positioning hole, and the osteotomy guide surface and the nerve protection guide surface are connected in a co-edge mode. Compared with the prior art, the guide plate can accurately position the deboning position of a patient, the operation difficulty is reduced, and accurate deboning is achieved; meanwhile, the deboning and nerve protection guide plate can also utilize the nerve protection guide surface to help the surgeon to control the position of the inferior alveolar nerve, so that the inferior alveolar nerve is prevented from being injured during deboning, and the safety of the surgery is improved.

Description

Technical Field

[0001] This utility model belongs to the field of medical devices in surgery, and the corresponding IPC classification number is A61B. It specifically relates to a guide plate for bone removal and nerve protection in sagittal split mandibular surgery. Background Technology

[0002] Sagittal split mandibular osteotomy is a commonly used surgical procedure in clinical practice. It is used to correct jaw deformities such as abnormal relative position and shape of the upper and lower jaws, abnormal facial appearance, and malocclusion between the upper and lower teeth. It is widely used in clinical practice and has become the preferred method for most orthognathic surgeons to treat jaw deformities.

[0003] Currently, because the inferior alveolar nerve is encased within the mandible, and the cortical bone density and morphology vary from patient to patient, oral and maxillofacial surgeons cannot visually determine the location and course of the inferior alveolar nerve during sagittal split mandibular osteotomy. Furthermore, the lack of suitable positioning tools forces surgeons to rely on their clinical experience for bone removal, leading to discrepancies between the amount of bone removed and the pre-operative surgical plan, hindering precise bone removal. Simultaneously, the inability to control the location of the inferior alveolar nerve frequently results in its damage during bone removal, causing postoperative symptoms such as numbness or sensory abnormalities in the lower lip and chin, and weakness in biting, which are difficult to recover from. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a guide plate for mandibular sagittal split osteotomy and nerve protection, which can accurately locate the osteotomy site during surgery, achieve precise osteotomy, and avoid damage to the inferior alveolar nerve during the osteotomy process.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] This utility model provides a guide plate for osteotomy and nerve protection in sagittal split mandibular osteotomy, comprising: a fixing part for fixing to the mandible and a positioning part for positioning the osteotomy location, wherein the fixing part and the positioning part are integrally formed; the positioning part has a positioning hole, and the side wall of the positioning hole is provided with an osteotomy guide surface and a nerve protection guide surface, wherein the osteotomy guide surface and the nerve protection guide surface are connected by a common edge. In this application, after the positioning hole positions the osteotomy location, the incision can be made downward from the osteotomy guide surface. When the incision reaches the nerve protection guide surface, the downward cutting stops; instead, horizontal cutting is performed along the nerve protection guide surface to trim the osteotomy on the upper side of the ramus and the lower edge of the mandible until the osteotomy is completed, thereby avoiding damage to the inferior alveolar nerve.

[0007] Furthermore, the osteotomy guide surface is a longitudinal surface that controls the depth of mandibular osteotomy, and the nerve protection guide surface is a transverse surface that intersects with the osteotomy guide surface. In this application, the nerve protection guide surface can guide the cutting depth of the osteotomy guide surface, avoiding excessive downward cutting and damage to the inferior alveolar nerve.

[0008] Furthermore, the bottom of the positioning part is provided with a fitting surface that can fit against the mandible. The upper edges of the osteotomy guide surface and the nerve protection guide surface are shared with the upper surface of the positioning part, and the lower edges are shared with the fitting surface. Moreover, the side edges of the osteotomy guide surface and the nerve protection guide surface are shared with each other.

[0009] Furthermore, the nerve protection guiding surface includes a first guiding surface and a second guiding surface, and the osteotomy guiding surface includes a third guiding surface and a fourth guiding surface, with the third guiding surface and the fourth guiding surface being disposed opposite to each other; the two sides of the third guiding surface and the fourth guiding surface are connected through the first guiding surface and the second guiding surface, respectively.

[0010] Furthermore, the positioning part is an arc-shaped structure that fits into the mandible, and both the upper and lower surfaces of the positioning part are arc-shaped surfaces, with the upper surface of the positioning part forming the fitting surface.

[0011] Furthermore, the upper surface of the positioning part is also provided with an indicator path for showing the course and location of the intraosseous nerve. The indicator path is the projection of the inferior alveolar nerve onto the upper surface of the positioning part. When the indicator path is reached, it can remind the operator to control the depth of cut and avoid damaging the inferior alveolar nerve.

[0012] Furthermore, the fixing part is provided with fixing holes for placing screws, which can indicate the screw placement position and facilitate the placement of screws on the mandible to fix the protective guide plate.

[0013] Furthermore, the fixing part is an arc-shaped strip structure that can be adapted to the shape of the human mandibular angle, thereby improving the stability of the protective guide plate.

[0014] Compared with existing technologies, the guide plate of this invention can accurately locate the bone removal position for the patient, reduce the difficulty of the operation, and achieve precise bone removal. At the same time, the bone removal and nerve protection guide plate can also use the nerve protection guiding surface to help the surgeon control the position of the inferior alveolar nerve, avoid damage to the inferior alveolar nerve during bone removal, and improve the safety of the operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure in which the bone removal and nerve protection guide plate fits into the mandible.

[0016] Figure 2 This is a schematic diagram of the front structure of the bone removal and nerve protection guide plate.

[0017] Figure 3 This is a schematic diagram of the back of the bone removal and nerve protection guide plate.

[0018] In the diagram, 1. Bone removal and nerve protection guide plate; 11. Fixation part; 111. Fixation hole; 12. Positioning part; 121. Positioning hole; 122. Osteotomy guide surface; 1221. Third guide surface; 1222. Fourth guide surface; 123. Nerve protection guide surface; 1231. First guide surface; 1232. Second guide surface; 124. Adhesion surface; 125. Indicator path; 2. Mandible. Detailed Implementation

[0019] 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 merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] To achieve the above objectives, the technical solution of this utility model is as follows:

[0021] See Figure 1-3 As shown, this embodiment provides a mandibular sagittal split osteotomy and nerve protection guide plate, including: a fixing part 11 for fixing to the mandible 2 and a positioning part 12 for positioning the osteotomy location. The fixing part 11 and the positioning part 12 are integrally formed. The positioning part 12 has a positioning hole 121. The side wall of the positioning hole 121 is provided with an osteotomy guide surface 122 and a nerve protection guide surface 123. The osteotomy guide surface 122 and the nerve protection guide surface 123 are connected by a common edge. In this application, after the positioning hole 121 positions the osteotomy location, the knife can be cut downward from the osteotomy guide surface 122. When the knife cuts to the nerve protection guide surface 123, the downward cutting stops; instead, the knife is cut horizontally along the nerve protection guide surface 123 to trim the bone on the upper side of the ramus and the lower edge of the mandible until the osteotomy is completed, thereby avoiding damage to the inferior alveolar nerve.

[0022] Furthermore, the osteotomy guide surface 122 is a longitudinal surface that controls the depth of osteotomy of the mandible 2, and the nerve protection guide surface 123 is a transverse surface that intersects with the osteotomy guide surface 122. During the operation, the cutting is made downward along the longitudinal surface. The nerve protection guide surface 123 can guide the cutting depth of the osteotomy guide surface 122. The cutting is stopped when the transverse surface is reached to avoid excessive downward cutting and damage to the inferior alveolar nerve.

[0023] Furthermore, the bottom of the positioning part 12 is provided with a fitting surface 124 that can conform to the mandible 2. The upper edges of the osteotomy guide surface 122 and the nerve protection guide surface 123 are shared with the upper surface of the positioning part 12, and the lower edges are shared with the fitting surface 124; and the side edges of the osteotomy guide surface 122 and the nerve protection guide surface 123 are shared with each other. The fitting surface 124 can conform to the outer side of the mandible 2, which facilitates the positioning of the osteotomy site.

[0024] Furthermore, the nerve protection guiding surface 123 includes a first guiding surface 1231 and a second guiding surface 1232, which are on the same horizontal plane; the osteotomy guiding surface 122 includes a third guiding surface 1221 and a fourth guiding surface 1222, which are longitudinal cutting surfaces arranged opposite to each other; the two sides of the third guiding surface 1221 and the fourth guiding surface 1222 are connected by the first guiding surface 1231 and the second guiding surface 1232, respectively.

[0025] Furthermore, the positioning part 12 is an arc-shaped structure that fits into the mandible 2. Both the upper and lower surfaces of the positioning part 12 are arc-shaped, and the upper surface of the positioning part 12 forms a fitting surface 124.

[0026] Furthermore, the upper surface of the positioning part 12 is also provided with an indicator path 125 for indicating the course and location of the intraosseous nerve. The indicator path 125 is the projection of the inferior alveolar nerve on the upper surface of the positioning part 12, and the positioning part 12 is a groove-shaped structure that passes through the positioning hole 121. When the indicator path 125 is cut, it can remind the operator to control the depth of cut to avoid damaging the inferior alveolar nerve.

[0027] Furthermore, the fixing part 11 is provided with fixing holes 111 for placing screws, which can indicate the screw placement position and facilitate the placement of screws on the mandible 2 to fix the protective guide plate.

[0028] Furthermore, the fixing part 11 is an arc-shaped strip structure that can be adapted to the shape of the human mandibular angle, thereby improving the stability of the protective guide plate fixation.

[0029] Furthermore, the bone removal and nerve protection guide plate 1 is made of titanium alloy, which is harder and less prone to deformation compared to conventional materials.

[0030] The method for manufacturing the guide plate in this embodiment is as follows:

[0031] 1. Obtain spiral CT data of the patient's mandible and export it in DICOM format;

[0032] 2. Import the spiral CT data of the patient's mandible into the 3D software mimic to segment and reconstruct the model of the patient's mandible and inferior alveolar nerve;

[0033] 3. Simulate the sagittal split mandibular bone procedure on the segmented and reconstructed mandibular bone model;

[0034] 4. Based on the simulated osteotomy line, design a bone removal and nerve protection guide plate that is compatible with the mandibular bone model;

[0035] 4. 3D printing to create metal bone removal and nerve protection guide plates.

[0036] Using the methods described above, a bone removal and nerve protection guide that matches the patient's mandible can be customized using CT image digital design and 3D printing technology. This allows for precise positioning of the bone removal location, reducing surgical difficulty and achieving accurate bone removal. At the same time, the bone removal and nerve protection guide can also use the nerve protection guide surface to help the surgeon control the position of the inferior alveolar nerve, avoiding damage to the inferior alveolar nerve during bone removal and improving the safety of the surgery.

[0037] The method of using the guide plate in this embodiment is as follows:

[0038] 1: The bone removal and nerve protection guide plate is positioned onto the patient's mandible based on the shape of the mandibular angle;

[0039] 2: Fix the bone removal and nerve protection guide plate to the patient's mandible using pins placed in the fixation holes;

[0040] 3: Use a saw to cut along the osteotomy guide surface. Stop osteotomy when you reach the nerve protection guide surface.

[0041] 4. Using surgical tools such as chisels, bone removal and reshaping are performed on the upper side of the ascending ramus and the lower edge of the mandible from the nerve-protected guiding surface.

[0042] The above methods enable precise osteotomy during surgery, avoiding damage to the inferior alveolar nerve during the osteotomy process.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A guide plate for bone removal and nerve protection in sagittal split mandibular osteotomy, characterized in that, include: A fixation part for fixing to the mandible and a positioning part for positioning the bone removal location are integrally formed; the positioning part is provided with a positioning hole, and the side wall of the positioning hole is provided with an osteotomy guide surface and a nerve protection guide surface, and the osteotomy guide surface and the nerve protection guide surface are connected by sharing the same edge.

2. The mandibular sagittal split osteotomy and nerve protection guide plate as described in claim 1, characterized in that, The osteotomy guide surface is a longitudinal surface that controls the depth of mandibular osteotomy, and the nerve protection guide surface is a transverse surface that intersects with the osteotomy guide surface.

3. The mandibular sagittal split osteotomy and nerve protection guide plate as described in claim 1, characterized in that, The bottom of the positioning part is provided with a fitting surface that can fit against the mandible. The upper edges of the osteotomy guide surface and the nerve protection guide surface are shared with the upper surface of the positioning part, and the lower edges are shared with the fitting surface. Furthermore, the side edges of the osteotomy guide surface and the nerve protection guide surface are shared with each other.

4. The mandibular sagittal split osteotomy and nerve protection guide plate as described in claim 1, characterized in that, The nerve protection guiding surface includes a first guiding surface and a second guiding surface, and the osteotomy guiding surface includes a third guiding surface and a fourth guiding surface, which are arranged opposite to each other; the two sides of the third guiding surface and the fourth guiding surface are connected by the first guiding surface and the second guiding surface, respectively.

5. The mandibular sagittal split osteotomy and nerve protection guide plate as described in claim 3, characterized in that, The positioning part is an arc-shaped structure that fits into the mandible. Both the upper and lower surfaces of the positioning part are arc-shaped, and the upper surface of the positioning part forms the fitting surface.

6. The mandibular sagittal split osteotomy and nerve protection guide plate as described in claim 1, characterized in that, The upper surface of the positioning part is also provided with an indicator path for showing the direction and location of intraosseous nerves.

7. The mandibular sagittal split osteotomy and nerve protection guide plate as described in claim 1, characterized in that, The fixing part is provided with fixing holes for placing nails.

8. The mandibular sagittal split osteotomy and nerve protection guide plate as described in claim 1, characterized in that, The fixing part is an arc-shaped strip structure that matches the shape of the human mandibular angle.

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