Orthognathic sectional osteotomy milling tool assembly

Abstract

The utility model discloses a kind of orthognathic block osteotomy milling cutter assemblies, comprising: stem, its proximal end and orthognathic surgery robot system's power output end detachably connected;Milling cutter, including central shaft support part and multiple milling portions, multiple the milling portion is set to the circumferential of the central shaft support part and evenly arranged;Wherein, multiple the milling portion between is provided with exclusion channel and timely discharge osteotomy bone, the maximum radius size of the milling cutter and target osteotomy width are coupled. Can simplify operation, reduce trauma and various surgical complications, greatly improve the operation effect.

Description

Technical Field

[0001] This utility model belongs to the field of bone suture distraction technology, and in particular relates to an orthognathic segmental osteotomy milling cutter assembly. Background Technology

[0002] In surgical procedures for bimaxillary protrusion, subapical osteotomy and retraction after extraction of teeth in both the maxilla and mandible is an effective treatment. This procedure is primarily for patients with bimaxillary protrusion, especially adults with severe symptoms. During the surgery, the anterior teeth of the maxilla and mandible (usually the first premolars) are first extracted to create the necessary space for osteotomy and retraction. Subsequently, a subapical osteotomy is performed in the anterior part of the maxilla and mandible, cutting the bone at the root of the teeth. After the osteotomy, the maxillary and mandibular bone segments are retracted to achieve the desired dentofacial relationship. Finally, a fixation device is used to stabilize the adjusted bone segments in their new positions to ensure the surgical outcome and promote bone healing. Maxillary anterior osteotomy typically involves extracting the first or second premolars of both maxillae during the procedure, then cutting the bone within the space, and finally retracting and fixing the cut bone. For the mandible, a subapical osteotomy of the anterior part of the mandible may be used, involving a subapical osteotomy of the anterior part of the mandible followed by appropriate retraction. The risks of bone removal during bimaxillary protrusion surgery mainly include bleeding, nerve damage, mandibular fracture, and uneven mandibular angle.

[0003] Currently, conventional surgical saws are typically used in this procedure, making bone removal extremely difficult. It's impossible to determine the amount of bone to remove, leading to repeated removals and increased bleeding. Controlling bone removal is challenging, potentially resulting in excessive removal, cutting into the roots of both teeth, causing root damage, nonunion, bone necrosis, or infection. Insufficient bone removal, on the other hand, can affect surgical outcomes, leading to postoperative malocclusion and, in severe cases, temporomandibular joint disorder. Furthermore, prolonged reverse bone removal at the mandibular root tip can cause excessive traction on the mandibular nerve, resulting in nerve damage, postoperative mandibular paralysis, and increased surgical risks. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a segmented osteotomy cutter assembly for orthognathic surgery, which simplifies the procedure, reduces trauma and various surgical complications, and significantly improves surgical outcomes.

[0005] The technical solution provided by this utility model is: a segmented osteotomy cutter assembly for orthognathic surgery, comprising: The proximal end of the rod is detachably connected to the power output end of the orthognathic surgery robot system. A milling cutter includes a central spindle support and multiple milling sections, wherein the multiple milling sections are disposed circumferentially and evenly arranged in the central spindle support; Among them, a discharge channel is provided between the multiple milling parts to discharge osteotomy fragments in a timely manner, and the maximum radius of the milling cutter is coupled to the target osteotomy width.

[0006] Preferably, the milling portion includes a first extension and a second extension, wherein the second extension of one of the milling portions forms the exclusion channel with the first extension of an adjacent milling portion.

[0007] Preferably, each of the milling parts has a plurality of guide grooves at one end near the first extension, and the guide grooves are connected to the discharge channel.

[0008] Preferably, the plurality of guide grooves are parallel to each other and perpendicular to the central shaft support portion, wherein the extension lines of the plurality of guide grooves of any one milling portion and the plurality of guide grooves of adjacent milling portions do not overlap in the lateral direction.

[0009] Preferably, the width of the guide groove is 2-3 mm.

[0010] Preferably, the distal end of the central support portion is provided with a tapered portion.

[0011] Preferably, the radial dimension of the proximal end of the first extension is greater than the radial dimension of the distal end, and the radial dimension of the proximal end of the first extension is coupled to the target osteotomy width.

[0012] Preferably, the radial dimension of the proximal end of the first extension is smaller than the radial dimension of the distal end, and the radial dimension of the distal end of the first extension is coupled to the target osteotomy width.

[0013] Preferably, the milling cutter includes two milling sections, which are arranged in a centrally symmetrical manner.

[0014] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art: The ability to select the appropriate model of orthognathic osteotomy cutter assembly based on pre-determined measurements simplifies surgery, reduces trauma and various surgical complications, and significantly improves surgical outcomes. In complex orthognathic surgeries, different patients have varying jaw deformities and osteotomy requirements. This precise dimensional matching ensures that each osteotomy operation reaches the predetermined accuracy range, avoiding overly wide or narrow cuts due to unsuitable tool sizes, thereby improving surgical precision. The proximal end of the lever 1 is detachably connected to the power output end of the orthognathic surgery robot system, ensuring stable power transmission from the robot system to the cutter. The robot system can precisely control the movement of the cutter according to a preset program and path, maintaining stable speed, direction, and force during osteotomy. This not only improves the accuracy of osteotomy but also effectively reduces errors and instabilities caused by manual operation, such as hand tremors, affecting osteotomy precision. Attached Figure Description

[0015] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a perspective view of one embodiment of the orthognathic segmental osteotomy milling cutter assembly of this utility model; Figure 2 This is a top view of an embodiment of the orthognathic segmental osteotomy milling cutter assembly of this utility model; Figure 3 This is a top view of an embodiment of the orthognathic segmental osteotomy milling cutter assembly of this utility model; Figure 4 This is a front view of another embodiment of the orthognathic segmental osteotomy milling cutter assembly of this utility model.

[0016] Explanation of reference numerals in the attached figures: 1-Bar section; 2-Milling cutter; 201-Central shaft support section; 2011-Taper section; 202-Milling section; 2021-First extension section; 2022-Second extension section; 2023-Guide groove; 3-Extraction channel. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0018] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0019] First Embodiment This embodiment provides a segmented osteotomy cutter assembly for orthognathic surgery, including: The proximal end of rod 1 is detachably connected to the power output end of the orthognathic surgery robot system. The milling cutter 2 includes a central support portion 201 and a plurality of milling portions 202, wherein the plurality of milling portions 202 are disposed circumferentially and evenly arranged in the central support portion 201; Among them, a discharge channel 3 is provided between the multiple milling sections 202 to discharge osteotomy fragments in a timely manner, and the maximum radius of the milling cutter 2 is coupled with the target osteotomy width.

[0020] The technical solution provided in this embodiment enables the selection of a suitable model of orthognathic segmental osteotomy milling cutter assembly based on a predetermined measurement, simplifying the surgery, reducing trauma and various surgical complications, and greatly improving surgical outcomes. In complex orthognathic surgeries, different patients have varying jawbone deformities and osteotomy requirements. This precise size matching ensures that each osteotomy operation reaches the predetermined accuracy range, avoiding overly wide or narrow osteotomies due to unsuitable tool sizes, thereby improving surgical precision. The proximal end of the rod 1 is detachably connected to the power output end of the orthognathic surgery robot system, ensuring stable power transmission from the robot system to the milling cutter 2. The robot system can precisely control the movement of the milling cutter 2 according to a preset program and path, enabling the milling cutter 2 to maintain stable speed, direction, and force during osteotomy. This not only improves the accuracy of osteotomy but also effectively reduces the impact of errors and instabilities caused by manual operation, such as hand tremors, on osteotomy precision.

[0021] Preferably, the milling portion 202 includes a first extension 2021 and a second extension 2022, wherein the second extension 2022 of the milling portion 202 forms the exclusion channel 3 with the first extension 2021 of the adjacent milling portion 202.

[0022] The milling section 202 includes a first extension 2021 and a second extension 2022, and the second extension 2022 of one milling section 202 forms an exclusion channel 3 with the first extension 2021 of the adjacent milling section 202. Compared with the traditional single-channel design, it can guide bone fragments out more effectively. The connection between adjacent extensions is tighter, avoiding blockage or residue of bone fragments during the removal process, ensuring that bone fragments can be smoothly removed from the surgical area. The channel is composed of specific extensions of adjacent milling sections 202, and its shape and orientation can be optimized according to the overall design of the milling cutter 2 and the needs of the surgery. During the osteotomy operation, bone fragments will naturally enter the exclusion channel 3 along the movement direction of the milling section 202. Due to the clear guidance of the channel, bone fragments will not scatter, making them easier to collect and process.

[0023] Preferably, each of the milling portions 202 bodies is provided with a plurality of guide grooves 2023 near one end of the first extension portion 2021, and the guide grooves 2023 are connected to the discharge channel 3.

[0024] Each milling section 202 body has multiple guide grooves 2023 near one end of the first extension 2021, and these guide grooves 2023 connect to the discharge channel 3. During the operation, when the milling cutter 2 performs osteotomy, the resulting bone fragments first enter the guide grooves 2023. The guide grooves 2023 act like tiny drainage channels, gathering bone fragments from various directions and guiding them orderly to the discharge channel 3. This design fully utilizes fluid dynamics principles, making it easier and faster for bone fragments to enter the discharge channel 3, preventing bone fragments from accumulating around the milling section 202. The presence of multiple guide grooves 2023 increases the drainage area, guiding bone fragments from different angles and positions. Compared to a design with a single or a few guide grooves 2023, multiple guide grooves 2023 can more comprehensively cover the area around the milling section 202, ensuring that bone fragments generated under different working conditions are effectively guided. Whether it's bone fragments that fly out during the high-speed rotation of the milling cutter 2 or bone fragments generated at a specific angle, they can all quickly reach the discharge channel 3 through the guide groove 2023.

[0025] Preferably, the plurality of guide grooves 2023 are parallel to each other and perpendicular to the central shaft support portion 201, wherein the extension lines of the plurality of guide grooves 2023 of any one milling portion 202 and the plurality of guide grooves 2023 of the adjacent milling portion 202 do not overlap in the lateral direction.

[0026] When multiple guide grooves 2023 are parallel to each other and perpendicular to the central support 201, and the extension lines of the guide grooves 2023 of adjacent milling sections 202 do not overlap in the lateral direction, bone fragments generated from different milling sections 202 will be discharged along their respective independent guide groove paths 2023. This avoids bone fragments from accumulating and mixing during discharge, preventing blockages or poor discharge. This design provides each milling section 202 with its own dedicated bone fragment discharge channel, much like setting up multiple "highways" for bone fragments, allowing them to leave the surgical area more orderly and smoothly. For example, in complex orthognathic surgery, when osteotomy of the maxilla and mandible is performed simultaneously, bone fragments generated from the maxilla will be discharged through their corresponding guide grooves 2023 without interfering with bone fragments from the mandible, ensuring the efficiency and orderliness of the entire bone fragment discharge process.

[0027] Preferably, the width of the guide groove 2023 is 2-3 mm. More preferably, it can be 2.5 mm.

[0028] Preferably, a tapered portion 2011 is provided at the distal end of the central axis support portion 201.

[0029] Setting the distal end of the central support 201 to be tapered is beneficial for intervention in the human body and reduces accidental damage to tissues.

[0030] Preferably, the radial dimension of the proximal end of the first extension 2021 is larger than the radial dimension of the distal end, and the radial dimension of the proximal end of the first extension 2021 is coupled with the target osteotomy width.

[0031] When the osteotomy cutter assembly is applied to the maxilla, a model with a radial dimension at the proximal end of the first extension 2021 that is larger than the radial dimension at the distal end is selected. This is because the human maxilla is thinner at deeper locations and thicker near the root.

[0032] Preferably, the radial dimension of the proximal end of the first extension 2021 is smaller than the radial dimension of the distal end, and the radial dimension of the distal end of the first extension 2021 is coupled with the target osteotomy width.

[0033] When the osteotomy cutter assembly is applied to the mandible, a model with a radial dimension at the proximal end of the first extension 2021 that is smaller than that at the distal end is selected. This is because the mandibular bone is thicker at deeper locations and thinner near the root.

[0034] Preferably, the milling cutter 2 includes two milling portions 202, which are arranged in a centrally symmetrical manner.

[0035] The two milling sections 202 are arranged symmetrically in a central manner, which facilitates operation and helps doctors to control the precision of the operation.

[0036] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific identification content executed by the system and device described above can be referred to the corresponding process in the foregoing method embodiments.

[0037] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A segmented osteotomy cutter assembly for orthognathic surgery, characterized in that, include: The proximal end of the rod is detachably connected to the power output end of the orthognathic surgery robot system. A milling cutter includes a central spindle support and multiple milling sections, wherein the multiple milling sections are disposed circumferentially and evenly arranged in the central spindle support; Among them, a discharge channel is provided between the multiple milling parts to discharge osteotomy fragments in a timely manner, and the maximum radius of the milling cutter is coupled to the target osteotomy width.

2. The orthognathic segmental osteotomy milling cutter assembly according to claim 1, characterized in that, The milling section includes a first extension and a second extension, wherein the second extension of one of the milling sections forms the exclusion channel with the first extension of an adjacent milling section.

3. The orthognathic segmental osteotomy milling cutter assembly according to claim 2, characterized in that, Each of the milling parts has a plurality of guide grooves at one end near the first extension, and the guide grooves are connected to the discharge channel.

4. The orthognathic segmental osteotomy milling cutter assembly according to claim 3, characterized in that, The plurality of guide grooves are parallel to each other and perpendicular to the central shaft support, wherein the extension lines of the plurality of guide grooves of any one milling part and the plurality of guide grooves of the adjacent milling part do not overlap in the lateral direction.

5. The orthognathic segmental osteotomy milling cutter assembly according to claim 3, characterized in that, The width of the guide groove is 2-3 mm.

6. The orthognathic segmental osteotomy milling cutter assembly according to claim 1, characterized in that, A tapered section is provided at the far end of the central axis support.

7. The orthognathic segmental osteotomy milling cutter assembly according to claim 2, characterized in that, The radial dimension of the proximal end of the first extension is greater than the radial dimension of the distal end, and the radial dimension of the proximal end of the first extension is coupled to the target osteotomy width.

8. The orthognathic segmental osteotomy milling cutter assembly according to claim 2, characterized in that, The radial dimension of the proximal end of the first extension is smaller than the radial dimension of the distal end, and the radial dimension of the distal end of the first extension is coupled to the target osteotomy width.

9. The orthognathic segmental osteotomy milling cutter assembly according to claim 1, characterized in that, The milling cutter includes two milling sections, which are arranged symmetrically at the center.

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