Lower jaw sagittal splitting osteotomy positioning guide plate

Abstract

The invention discloses a lower jaw sagittal splitting osteotomy positioning guide plate. Comprising a lower supporting type positioning guide plate, a middle occlusion positioning plate and an upper supporting type positioning guide plate which are sequentially connected through connecting rods, wherein the lower supporting type positioning guide plate is manufactured according to the outer side form of a lower jaw body part; the middle occlusion positioning plate is manufactured according to first molars and first premolars of a patient; the upper supporting type positioning guide plate is manufactured according to the outer side form of a lower jaw ramus; the upper supporting type positioning guide plate extends towards the inner side of the mandibular branch to form a mandibular branch inner side horizontal osteotomy guide rod set according to the position of a small tongue of the mandibular branch, and the lower end of the lower supporting type positioning guide plate is provided with a lower edge supporting type positioning guide plate manufactured according to the shape of the lower edge of the mandibular branch. The lower supporting type positioning guide plate is provided with a vertical osteotomy guide groove which is designed and manufactured according to an operation. According to the guide plate, the osteotomy and reduction process in the sagittal split operation of the lower jaw is more accurate through accurate design and positioning, inferior alveolar nerves can be effectively protected, the postoperative stability is improved, compared with the prior art, the safety, accuracy and efficiency of the operation are remarkably improved, risks in the operation are reduced, and the operation cost is reduced. The important clinical application value is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of oral medical devices, and particularly relates to a positioning guide plate for sagittal split osteotomy of the mandible. Background Art

[0002] The sagittal split osteotomy of the mandible is a surgical procedure commonly used to correct the relative position abnormality of the mandible. When performing the sagittal split osteotomy of the mandible, it is crucial to avoid damaging the inferior alveolar nerve and vascular bundle. However, the traditional surgical method relies on the experience of surgeons, making it difficult to accurately locate, and there is a lack of effective auxiliary tools to ensure the accuracy of the osteotomy line. Especially in the area of the lingula of the mandible near the osteotomy line, it is easy to accidentally injure the neurovascular structure due to limited vision during the operation. In addition, when refixing the ascending ramus part of the mandible containing the condylar process and the body part of the mandible containing the mandibular dentition, whether the condylar process is in a reasonable position extremely depends on the experience of the physician. If the position of the condylar process deviates beyond its physiological adaptability after the operation, it may lead to problems such as recurrence / joint absorption or pain after the operation. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a positioning guide plate for sagittal split osteotomy of the mandible to solve the deficiencies in the prior art.

[0004] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0005] Provide a positioning guide plate for sagittal split osteotomy of the mandible, which includes a lower support type positioning guide plate made according to the outer shape of the mandibular body, a middle occlusal positioning plate made according to the patient's first molar and first premolar, and an upper support type positioning guide plate made according to the outer shape of the ascending ramus of the mandible, which are sequentially connected by a connecting rod. The upper support type positioning guide plate extends towards the inner side of the mandibular ramus to form a horizontal osteotomy guide rod of the inner side of the mandibular ramus set according to the position of the lingula of the mandible. The lower end of the lower support type positioning guide plate is provided with a lower edge support type positioning guide plate made according to the shape of the lower edge of the mandible, and the lower support type positioning guide plate is provided with a vertical osteotomy guiding groove made according to the surgical design.

[0006] As the positioning guide plate for sagittal split osteotomy of the mandible, the lower support type positioning guide plate is further provided with a bone removal guiding groove made according to the surgical design.

[0007] As the positioning guide plate for sagittal split osteotomy of the mandible, the front side of the vertical osteotomy guiding groove is provided with a distal positioning guide plate nail hole made according to the surgical design, and the rear side of the bone removal guiding groove is provided with a proximal positioning guide plate nail hole made according to the surgical design.

[0008] As the positioning guide plate for sagittal split osteotomy of the mandible, the inner side of the mandibular ramus is provided with a horizontal osteotomy line of the inner side of the mandibular ramus set according to the position of the lingula of the mandible.

[0009] As described in the mandibular sagittal split osteotomy positioning guide plate, on one side of the inner horizontal osteotomy guiding rod of the mandibular ramus facing the oral cavity, there is a protection plate on the inner side of the mandibular ramus.

[0010] The beneficial effects of the technical solution of the present invention are as follows:

[0011] 1. Precise avoidance of the nerve canal (protecting the surrounding soft tissues): Through the guide plate design, the precise positions of the lingula mandibulae and the inferior alveolar nerve can be simulated before the operation. The osteotomy line is designed to be above the lingula mandibulae, and the markings on the guide plate ensure the precise position of the horizontal osteotomy line, avoiding accidental injury to the inferior alveolar nerve or its vascular bundle during the operation; on one side of the guiding rod facing the oral cavity, there is a protection plate on the inner side of the mandibular ramus. When performing osteotomy, there is no need for additional instruments to protect the soft tissues on the inner side of the ascending ramus, avoiding excessive dissection of the soft tissues on the inner side of the ascending ramus and blind exposure of the lingula mandibulae in traditional surgeries, thereby reducing soft tissue injury.

[0012] 2. Precise bone removal and reduction: When performing bone removal operations, the design of the guide plate can accurately mark the bone removal area and perform personalized bone removal design according to the patient's anatomical structure; during the operation, the fixation nail channels of the guide plate are designed according to the postoperative titanium plate fixation nail holes designed in the surgical plan. Through the precise design of the nail channels, when using the corresponding titanium plate for fixation, the problem of inaccurate reduction caused by the variability of the condylar process position is avoided, improving the accuracy of the operation.

[0013] 3. Adaptation and stability of the positioning holes: The multiple fixations of the fixation nail channels designed in the guide plate and the occlusal positioning plate ensure more stable fixation of the guide plate, avoiding the problem of inaccurate osteotomy caused by the loosening of the guide plate during the operation, and improving the accuracy of the operation; the designed fixation nail channels coincide with the nail holes designed for titanium plate fixation, without the need to add additional nail holes, avoiding additional damage to the patient. Description of the Drawings

[0014] To further illustrate the above-mentioned objects, structural features, and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0015] Figure 1 Schematic diagram of the installation of the first preferred embodiment of the present invention;

[0016] Figure 2 Schematic diagram of the installation of another preferred embodiment of the present invention;

[0017] Figure 3 Schematic diagram of the titanium plate fixation setting using the positioning nail holes in the preferred embodiment of the present invention;

[0018] In the figure: 1, connecting rod; 2, lower support type positioning guide plate; 3, middle occlusion positioning plate; 4, upper support type positioning guide plate; 5, inner horizontal osteotomy guiding rod of mandibular ramus; 6, lower edge support type positioning guide plate; 7, vertical osteotomy guiding groove; 8, bone removal guiding groove; 9, distal positioning guide plate nail hole; 10, proximal positioning guide plate nail hole; 11, inner horizontal osteotomy line of mandibular ramus; 12, inner protection plate of mandibular ramus. Detailed implementation mode

[0019] The terms "invention" and "the present invention" as used in this specification are intended in a broad sense to refer to all the subject matter of this specification and any of the following patent claims. Statements containing these terms should not be construed as limiting the subject matter described herein or the meaning or scope of any of the following patent claims. In addition, this specification does not attempt to describe or limit the subject matter covered by any of the claims of any specific component, paragraph, statement, or drawing of this application. The subject matter should be understood with reference to the entire specification, all the drawings, and any of the following claims. The present invention may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the language and terms used herein are for illustrative purposes and should not be considered limiting.

[0020] Details of the present invention will now be discussed with reference to the drawings of the present invention, which are illustrated by way of example only. In the drawings, like features or components may be labeled with the same reference numerals.

[0021] The use of "comprising", "having", "including" and their variants herein means including the items listed hereinafter, their equivalents and additional items. Although directions such as above, below, upward, downward, backward, bottom, top, front, back, etc. may be referred to in the description of the drawings, for convenience, they are referred to with respect to the drawings. These directions are not intended to be literally accepted or limiting in any form of the present invention. In addition, terms such as "first", "second", "third", etc. are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0022] See Figure 1 、 Figure 2As shown, in a preferred embodiment, the sagittal split osteotomy positioning guide plate of the present invention for the mandible includes a lower support type positioning guide plate 2 made according to the outer shape of the mandibular body, a middle occlusal positioning plate 3 made according to the patient's first molar and first premolar, and an upper support type positioning guide plate 4 made according to the outer shape of the mandibular ramus, which are sequentially connected by a connecting rod 1. After the upper support type positioning guide plate 4 extends towards the inner side of the mandibular ramus, a horizontal osteotomy guiding rod 5 for the inner side of the mandibular ramus set according to the position of the lingula of the mandible is formed. The lower end of the lower support type positioning guide plate 2 is provided with a lower edge support type positioning guide plate 6 made according to the shape of the lower edge of the mandible, and a vertical osteotomy guiding groove 7 made according to the surgical design is provided on the lower support type positioning guide plate 2. This positioning guide plate includes the precise positioning and marking functions for the lingula area of the mandible, avoiding damage to the inferior alveolar nerve during the operation.

[0023] In an embodiment where bone removal is required, a bone removal guiding groove 8 made according to the surgical design is further provided on the lower support type positioning guide plate 2. Generally, the bone removal guiding groove 8 is parallel to the vertical osteotomy guiding groove 7. It can be understood that the bone removal action is basically to remove the bone obstruction existing in the retraction. In the case where the mandible itself protrudes forward, there is no need to set the bone removal guiding groove 8.

[0024] See Figure 1 and Figure 3 As shown, a distal end positioning guide plate hole 9 made according to the surgical design is provided on the front side of the vertical osteotomy guiding groove 7, and a proximal end positioning guide plate hole 10 made according to the surgical design is provided on the rear side of the bone removal guiding groove 8. Here, the front and rear directions are defined with the nasal end of the human face as the front and the back of the head as the back. After the osteotomy and bone removal processes are completed, the guide plate can provide the positioning holes for the titanium plate, facilitating the subsequent fixation of the titanium plate and ensuring the stability of the mandible. Preferably, the thickness of the lower support type positioning guide plate 2 is 3 mm or 4 mm or 5 mm or 6 mm or 7 mm, the aperture of the nail hole is 3 mm or 4 mm or 5 mm or 6 mm or 7 mm, and the height of the guide plate is approximately at the three - quarters position of the overall height of the mandibular body.

[0025] A horizontal osteotomy line 11 for the inner side of the mandibular ramus set according to the position of the lingula of the mandible is provided on the inner side of the mandibular ramus. The osteotomy line is set above the lingula of the mandible to avoid damaging the inferior alveolar nerve. By accurately marking the horizontal osteotomy line through the guide plate, it is ensured that the osteotomy line is always within the safe area (i.e., avoiding the lingula area of the mandible and the nerve bundle area). Preferably, the vertical height of the horizontal osteotomy guiding rod 5 for the inner side of the mandibular ramus is 2 mm or 3 mm or 4 mm or 5 mm and the thickness is 2 mm or 3 mm or 4 mm or 5 mm.

[0026] A mandibular ramus inner side protection plate 12 is provided on the side of the horizontal osteotomy guiding rod 5 for the inner side of the mandibular ramus facing the oral cavity. The setting of the protection plate makes it unnecessary to additionally place a protection instrument between the osteotomy line and the inner soft tissue, avoiding the damage caused by excessive muscle stripping and reducing the operation time increased by placing the instrument.

[0027] Preparation method:

[0028] 1. Data acquisition and modeling: Reconstruct the three-dimensional model of the patient's mandible from the oral CBCT image data, match it with the lower dental arch model, determine the positions of the osteotomy line, bone removal line, titanium plate fixing holes, etc., and perform personalized design according to the patient's oral CT image or three-dimensional model;

[0029] 2. Personalized design: Based on the integrated three-dimensional model, use professional CAD software to design the shape and size of the guide plate to ensure that each part precisely matches the patient's anatomical structure;

[0030] 3. Guide plate manufacturing: Produce the guide plate through 3D printing technology, using biocompatible materials to ensure the stability and durability of the guide plate during the operation.

[0031] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all the equivalent replacements and obvious changes made by using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A mandibular sagittal split osteotomy positioning guide, characterized in that: It includes a lower supporting positioning guide plate made according to the outer morphology of the mandibular body, a middle occlusal positioning plate made according to the patient's first molar and first premolar, and an upper supporting positioning guide plate made according to the outer morphology of the mandibular ascending ramus, which are connected in sequence by connecting rods. The upper supporting positioning guide plate extends toward the inner side of the mandibular ramus to form a horizontal osteotomy guide rod on the inner side of the mandibular ramus set according to the position of the lingula. The lower end of the lower supporting positioning guide plate is provided with a lower edge supporting positioning guide plate made according to the morphology of the lower edge of the mandible, and the lower supporting positioning guide plate is provided with a vertical osteotomy guide groove made according to the surgical design.

2. The mandibular sagittal split osteotomy positioning guide according to claim 1, characterized in that: The lower supporting positioning guide plate is also provided with a bone removal guide groove made according to the surgical design.

3. The mandibular sagittal split osteotomy positioning guide according to claim 2, characterized in that: A distal end positioning guide plate nail hole made according to the surgical design is provided on the front side of the vertical osteotomy guide groove, and a proximal end positioning guide plate nail hole made according to the surgical design is provided on the rear side of the bone removal guide groove.

4. The mandibular sagittal split osteotomy positioning guide according to claim 1, characterized in that: A mandibular ramus medial horizontal section line is provided on the mandibular ramus medial side, which is set according to the position of the uvula.

5. The mandibular sagittal split osteotomy positioning guide according to claim 1, characterized in that: A mandibular ramus medial protection plate is provided on the side of the mandibular ramus medial horizontal osteotomy guide rod facing the inside of the oral cavity.

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