5D bionic minimally invasive adjustable maxillary and mandibular protrusion retraction device

Abstract

The application discloses a 5D bionic minimally invasive adjustable maxillary and mandibular protrusion retraction device, which comprises a screw rod force applying unit, a screw arch retractor connecting unit, a rigid connecting support unit, a posterior tooth fixing unit and a anchorage nail. The screw rod force applying unit comprises an adjusting screw rod, first connecting seats are connected to both ends of the adjusting screw rod, an extension arm is arranged between the two first connecting seats, an adjusting piece with an adjusting hole is arranged on the adjusting screw rod in a threaded mode, and the extension arm is synchronously retracted by rotating the adjusting screw rod to strengthen the posterior tooth anchorage. The anchorage nail is implanted into the cortical bone of the jaw through the rigid connecting support unit. Another scheme of the application comprises a bilateral adjustable force applying screw rod assembly, a rigid connecting support assembly, a posterior tooth fixing assembly and a buccal side implant anchorage assembly. The application realizes the overall synchronous retraction of the anterior jaw bone, alveolar bone and anterior teeth through a rigid force transmission path, and has the advantages of minimally invasive, stable anchorage and controllable force system.

Description

Technical Field

[0001] This invention belongs to the field of oral medical device technology, and in particular relates to a 5D bionic minimally invasive adjustable mandibular protrusion retraction device. Background Technology

[0002] Adult maxillary and mandibular protrusion is one of the most common skeletal malocclusions in clinical practice. It is mainly characterized by excessive development of the maxillary basal bone or mandibular alveolar bone, sagittal skeletal imbalance, and is often accompanied by labial inclination of the anterior teeth, increased lateral convexity, and abnormal occlusion. For moderate to severe skeletal protrusion, the mainstream clinical approach is orthognathic surgery (such as Le Fort I osteotomy or BSSO) to achieve overall jaw retraction and occlusal reconstruction. For mild to moderate cases or those who cannot tolerate surgery, simple orthodontic camouflage treatment is used, which involves extracting premolars and relying on strong anchorage devices such as micro-implant anchorage, Nance arches, and extraoral arches to provide space for anterior tooth retraction.

[0003] However, existing orthodontic techniques have many shortcomings. Orthognathic surgery is highly invasive, risky, and has a long recovery period, limiting its clinical applicability. Conventional orthodontics can only achieve compensatory tooth movement and cannot effectively remodel the jawbone, resulting in limited effectiveness in correcting moderate to severe skeletal protrusion. The anchorage system lacks stability, easily leading to anchorage loss such as molar retraction and excessive consumption of extraction spaces. The anchorage reserve of the mandibular posterior teeth is even worse, and micro-implants are prone to loosening and falling out. The treatment process is lengthy, with bimaxillary orthodontic treatment typically requiring 2.5 to 3 years. The risk of complications such as root resorption and bone fenestration continues to accumulate with the extension of treatment. In addition, existing orthodontic force systems are singular and lack root control precision. When retracting anterior teeth, non-ideal movements such as crown lingual tilting and root labial displacement are prone to occur. In patients with skeletal protrusion, the alveolar bone on the labial and buccal sides is thin, and poor movement can easily induce bone fenestration, bone dehiscence, and gingival recession. To solve the above problems, a 5D bionic minimally invasive adjustable maxillary and mandibular protrusion retraction device is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a 5D bionic minimally invasive adjustable mandibular protrusion retraction device to solve the problem.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention is a 5D bionic minimally invasive adjustable mandibular protrusion retraction device, including a spiral rod force application unit for outputting bony retraction force; The spiral arch retraction connector unit is used to enhance the overall support stiffness of the posterior teeth; A rigid connection bracket unit is connected to the front end of the helical rod force application unit; The posterior tooth retention unit is connected to the spiral arch retraction device connection unit; An anchorage screw, after passing through the rigid connection scaffold unit, is implanted into the cortical bone of the jawbone to provide bony anchorage for the rigid connection scaffold unit; By adjusting the helical rod force application unit, the rigid connection support unit is driven to move the anterior jawbone, alveolar bone and anterior teeth as a whole backward and inward.

[0006] Preferably, the screw rod force application unit includes an adjusting screw, first connecting seats respectively connected to both ends of the adjusting screw, and a telescopic arm between the two first connecting seats. The adjusting screw is also threaded with an adjusting member on its circumferential side, and the adjusting member has several adjusting holes on its circumferential side. By inserting a tool into the adjusting hole and rotating the adjusting screw, the telescopic arms on both sides are driven to retract synchronously to enhance the overall support stiffness of the posterior tooth.

[0007] Preferably, there are four anchorage screws, which are symmetrically distributed in a rectangular shape on the palatal part of the maxilla or the lingual side of the mandible; the rigid connection bracket unit has an installation hole, through which the anchorage screw is inserted into the cortical bone of the jawbone.

[0008] Preferably, a dual-sided adjustable force-applying screw assembly is used to output bony adduction force; A rigid connection bracket assembly is connected to the front end of the dual-sided adjustable force-applying screw assembly; The posterior tooth retention assembly is connected to the rear end of the bilaterally adjustable force-applying screw assembly; A buccal implant anchorage component is implanted within the buccal cortex to provide bony anchorage for the rigid connection scaffold assembly; By adjusting the dual-sided adjustable force-applying screw assembly, the rigid connection bracket assembly is driven to move the anterior jawbone, alveolar bone, and anterior teeth as a whole backward and inward.

[0009] Preferably, the buccal implant anchorage assembly includes four anchorage screws, which are symmetrically distributed in a rectangular shape in the buccal cortical bone region between the second premolar and the first molar on both sides.

[0010] Preferably, the dual-sided adjustable force-applying screw assembly includes two adjustable screw rods, one on the left and one on the right, which are symmetrically arranged on the cheek side.

[0011] Preferably, each of the adjustable screw rods is provided with a second connecting seat at both the front and rear ends. The second connecting seat at the front end is connected to the rigid connecting bracket assembly, and the second connecting seat at the rear end is connected to the posterior tooth retention assembly.

[0012] Preferably, the second connecting seat and the adjustable screw rod, the second connecting seat and the rigid connecting bracket assembly, and the second connecting seat and the posterior tooth retention assembly are all threaded connections.

[0013] Preferably, the anchorage nail is a miniature pure titanium implant anchorage nail.

[0014] Preferably, both the screw rod force application unit and the double-sided adjustable force application screw assembly are made of medical-grade stainless steel.

[0015] The present invention has the following beneficial effects: 1. This invention achieves minimally invasive correction of maxillary and mandibular skeletal protrusion, significantly expanding the clinical application scope of skeletal correction. Specifically, it involves setting up miniature implant anchorage screws and implanting them into the mandibular cortical bone as skeletal anchorage. Combined with surgical-assisted cortical bone release to induce local bone remodeling, it replaces the traditional orthognathic surgery with large-scale osteotomy. Only minimally invasive implantation is required to achieve overall mandibular retraction. The surgery is less invasive, the postoperative recovery is faster, and the treatment cost is lower. It can be used for mild, moderate, and severe cases of maxillary and mandibular skeletal protrusion, and is especially suitable for complex cases with weak alveolar bone, poor tooth root conditions, and inability to tolerate traditional strong anchorage orthodontics and orthognathic surgery. 2. This invention achieves stable anchorage and precise force control throughout the entire orthodontic process, significantly reducing the risk of complications such as root resorption and bone fenestration. Specifically, it forms a closed rectangular skeletal anchorage frame by rigidly connecting a rigid framework with four rectangular anchorage screws. This, combined with a helical rod force application unit or a bilaterally adjustable force application screw assembly, outputs a constant and controllable skeletal retraction force. This overcomes the shortcomings of traditional archwires, which have large fluctuations and rapid attenuation of elastic force. The orthodontic reaction force is rigidly supported by the anchorage screws and the jawbone throughout the entire process, thus avoiding anchorage loss problems such as posterior tooth anterior movement and abnormal consumption of extraction spaces. At the same time, the rigid framework constrains the movement trajectory of the anterior teeth, ensuring that the crown and root move synchronously and parallelly, avoiding non-ideal movements such as excessive lingual tipping of the crown and labial displacement of the root. This achieves micron-level precise displacement control and constant force output, significantly improving orthodontic safety and long-term prognosis. 3. This invention achieves synchronous and overall retraction of the anterior jawbone, alveolar bone, and anterior teeth, fundamentally correcting skeletal protrusion deformity and reducing the risk of relapse. Specifically, it connects the posterior tooth retention unit and the rigid support frame through a spiral rod force application unit or a bilaterally adjustable force application screw assembly, constructing a direct rigid force transmission path from the posterior tooth retention fulcrum to the force application screw, rigid support frame, and jawbone base. In conjunction with the spiral arch retraction device connecting unit, the bilateral telescopic arms actively contract to strengthen the overall anchorage stiffness of the posterior teeth, allowing the corrective force to be directly targeted to the jawbone base, driving the anterior jawbone, alveolar bone, and anterior teeth to retract synchronously backward and inward. This changes the traditional dental compensation mode of moving teeth first and then bones, achieving pure skeletal correction with priority to bone remodeling and synchronous movement of tooth roots with the bone. The skeletal structure has strong stability, and the risk of deformity relapse is greatly reduced after the correction is completed.

[0016] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the overall structure of the 5D biomimetic adjustable maxillary and mandibular protrusion retraction device provided in Scheme 1 of the present invention. Figure 2 for Figure 1 A schematic diagram of the screw rod force application unit in the diagram; Figure 3 A schematic diagram of the overall structure of the 5D biomimetic adjustable maxillary and mandibular protrusion retraction device provided in Scheme 2 of the present invention. Figure 4 This is a schematic diagram of the distribution of palatal implant anchorage screws provided in Solution 1 of the present invention. Figure 5 for Figure 3 A schematic diagram of the structure of the double-sided adjustable force-applying screw assembly; Figure 6 This is a schematic diagram of the structure of the anchorage nail of the present invention.

[0019] The components represented by each number in the attached diagram are listed below: 1. Screw rod force application unit; 2. Screw arch retraction device connection unit; 3. Rigid connection support unit; 4. Posterior tooth retention unit; 5. Mounting hole; 6. Telescopic arm; 7. Adjusting screw; 8. Adjusting hole; 9. First connecting seat; 10. Bilaterally adjustable force application screw assembly; 11. Posterior tooth retention assembly; 12. Buccal implant anchorage assembly; 13. Rigid connection support assembly; 14. Anchorage screw; 15. Second connecting seat; 16. Adjustable screw rod. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "upper," "middle," "outer," "inner," etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0022] Example 1: This embodiment provides a 5D bionic minimally invasive adjustable maxillary and mandibular protrusion retraction device. This device is mainly suitable for the correction of maxillary or mandibular skeletal protrusion, especially for cases in which anchorage screws are implanted on the palatal side of the maxilla or the lingual side of the mandible.

[0023] Please refer to Figure 1 , Figure 2 and Figure 4 The device mainly includes a spiral rod force application unit 1, a spiral arch retraction device connection unit 2, a rigid connection support unit 3, a posterior tooth retention unit 4, and an anchorage screw 14. The spiral rod force application unit 1 is used to output skeletal retraction force and is the core force source of the device. The spiral arch retraction device connection unit 2 is located between the bilateral posterior tooth retention units 4 to enhance the overall anchorage stiffness of the posterior teeth. The rigid connection support unit 3 is fixedly connected to the front end of the spiral rod force application unit 1, serving as the anterior transmission fulcrum of the orthodontic force. The posterior tooth retention unit 4 is fixed to the crowns of the patient's bilateral posterior teeth, serving as the posterior retention basis of the orthodontic force. The anchorage screw 14 passes through the mounting hole 5 opened on the rigid connection support unit 3 and is implanted into the cortical bone of the patient's jawbone, providing stable and reliable skeletal anchorage for the rigid connection support unit 3. In use, clinicians can adjust the output of a controllable bony retraction force by adjusting the screw rod force application unit 1. This retraction force is transmitted to the rigid connection support unit 3 via the screw rod force application unit 1, and the rigid connection support unit 3 directly drives the anterior part of the jawbone, alveolar bone and anterior teeth to retract backward and inward.

[0024] In the above structure, the helical rod force-applying unit 1 not only serves as a force source, but its structure also functions as an active reinforcement of posterior tooth anchorage. For details, please refer to... Figure 6The screw-operated force unit 1 includes an adjusting screw 7, which is laterally positioned on the palatal or lingual side. Each end of the adjusting screw 7 is threadedly connected to a first connecting seat 9, which is fixedly connected to two telescopic arms 6 on both sides. The ends of the telescopic arms 6 are connected to the posterior tooth retention unit 4. An adjusting element, which can be an adjusting nut, is threaded onto the circumferential surface of the adjusting screw 7. Several adjusting holes 8 are spaced circumferentially on the circumferential surface of the adjusting element. During clinical force application, the doctor inserts a special tool (such as a torque wrench or torque needle) into the adjusting hole 8 and rotates the adjusting element. The adjusting element drives the adjusting screw 7 to rotate. Because the threads at both ends of the adjusting screw 7 are opposite (one end is a left-hand thread and the other end is a right-hand thread), the rotation of the adjusting screw 7 causes the two first connecting seats 9 to move in opposite directions along the axial direction of the adjusting screw 7, thereby driving the two telescopic arms 6 to retract synchronously inward. When the bilateral telescopic arms 6 retract inward, they apply an inward tightening force to the bilateral posterior tooth retention units 4, causing the crowns of the posterior teeth to come closer together, thereby actively strengthening the overall anchorage stiffness of the posterior teeth. This active arch retraction mechanism can effectively counteract the reverse force generated during anterior tooth retraction, fundamentally eliminating common anchorage loss problems in traditional orthodontics, such as posterior tooth abduction, forward movement, tilting, and abnormal consumption of extraction spaces, ensuring the integrity of the anterior tooth retraction space. In addition, the adjusting screw 7 adopts a precision thread structure, allowing the dentist to precisely control the angle and number of rotations each time according to the patient's bone remodeling rate and tolerance, achieving quantitative output of orthodontic force.

[0025] Please refer to Figure 1 and Figure 2 The rigid connection framework unit 3 includes anterior and posterior rigid connection frameworks, both integrally molded from medical-grade stainless steel. The surface is smooth and rounded, without sharp corners or burrs, effectively preventing friction and pressure damage to the oral mucosa during long-term intraoral wear. The anterior rigid connection framework spans both sides of the anterior anchorage screws and is rigidly locked to the front end of the screw force application unit 1 via the first connecting seat 9. Serving as the front-end load-bearing and core transmission fulcrum for skeletal retraction forces, it precisely defines the movement trajectory of the anterior teeth, ensuring synchronous parallel movement of the crown and root, and mechanistically avoiding excessive lingual tilting of the crown and labial displacement of the root. The posterior rigid connection framework spans both sides of the posterior anchorage screws, significantly improving the overall framework rigidity, dispersing localized stress concentration, and reducing the risk of anchorage screw loosening, micro-displacement, and localized overload on the root. The anterior and posterior rigid connection frameworks are rigidly fixed to each anchorage screw via screws, and work in conjunction with the posterior tooth retention unit 4 and the spiral rod force application unit 1 to form an integrated rigid anchorage force transmission system. This rigid force transmission system eliminates the problems of force attenuation, tooth tilting and movement, and root displacement caused by the elastic deformation of traditional archwires, ensuring that the orthodontic force can be efficiently and stably transmitted to the target bone segment throughout the entire process.

[0026] Please refer to Figure 1The posterior tooth retention unit 4 includes bilaterally symmetrically arranged individualized cast metal retention bands. The inner wall of the retention band perfectly conforms to the anatomical shape of the patient's molar crown, precisely adapting to the crown's convexity, high points, and proximal relationships. The retention bands are tightly bonded to the crown using dental resin adhesive, ensuring a tight fit and sufficient retention force, capable of withstanding orthodontic reverse forces for a long time without the risk of loosening, falling off, or shifting. An extension connecting arm is integrally formed on the inner center of each retention band. This extension connecting arm is integrally cast, rigid, seamless, and without stress weak points, extending horizontally towards the anterior aspect of the jawbone. Its surface has standardized precision threaded holes for detachable and precise fixed connection with the rear end of the screw rod force application unit 1 or the telescopic arm 6. In this embodiment, the retention band can adopt a double-sided full-coverage structure on both the buccal and lingual sides to significantly increase the contact area between the band and the crown, and evenly distribute the orthodontic reverse force. For patients with molar defects, short crowns, or poor retention conditions, a custom-made full crown can also be used as a retention solution to achieve full circumferential retention by completely covering the tooth with the crown, thus completely eliminating the risk of the device falling off.

[0027] Please refer to Figure 1 and Figure 4 Four anchorage screws (14 in total) are arranged in a rectangular, symmetrical pattern on the palatal region of the maxilla or the lingual region of the mandible, within a sufficiently cortical bone area. Two anterior anchorage screws are placed in the cortical bone area of ​​the bilateral canines, and two posterior anchorage screws are placed in the cortical bone area of ​​the bilateral molars. This symmetrical arrangement of the anterior and posterior anchorage screws forms a stable rectangular three-dimensional skeletal anchorage framework, providing a stable anchorage basis for the overall translation of the anterior segment of the maxilla or mandible and for parallel movement of the tooth roots. The anchorage screws (14 in total) are miniature pure titanium implant anchorage screws, with a standard diameter of 1.5 mm and a length of 10 mm. Specific dimensions can be individually adjusted based on the patient's preoperative CBCT findings of bone thickness, bone density, cortical bone integrity, and tooth root spacing. Four anchorage screws 14 are inserted into the jawbone cortex after passing through the corresponding mounting holes 5 on the rigid connection bracket unit 3. The position and diameter of the mounting holes 5 are adapted to the implantation site and diameter of the anchorage screws 14 to ensure accurate positioning and reliable locking between the bracket and the anchorage screws.

[0028] To enhance the adaptability of this embodiment to individual differences, the rigid screw assembly in the screw rod force application unit 1 can be flexibly replaced with elastic or semi-elastic force source components such as a pull-ring elastic traction device, a medical silicone core rubber band, or a precision spring assembly, depending on the patient's specific jawbone condition and subjective tolerance level. During replacement, the aforementioned alternative components are uniformly compatible with the original fixation interface and threaded connection specifications, requiring no modifications to other components of the device. In clinical operation, doctors can dynamically switch between rigid force transmission and elastic buffer modes based on CBCT bone mineral density changes, mucosal health index, and the patient's VAS pain score obtained every 4-6 weeks during follow-up visits. This significantly improves treatment comfort and reduces the incidence of soft tissue complications while maintaining the complete closed loop of the main malocclusion pathway.

[0029] Working principle: Preoperative preparation and site localization: The patient underwent a comprehensive oral CBCT scan to accurately measure the thickness of the palatal or lingual cortical bone, bone density, bone distribution, and interdental distance. Based on the anatomical features of the jawbone, the implantation sites of the four anchorage screws were accurately selected and marked. The implantation sites must strictly avoid the palatal suture, the areas where nerves and blood vessels run, and the root projection areas.

[0030] Minimally invasive implantation of anchorage screws: After routine disinfection and draping of the surgical area, local infiltration anesthesia is administered. Four anchorage screws (14) are minimally invasively implanted at the pre-marked safety sites, forming a rectangular, symmetrically distributed bony anchorage framework. Postoperatively, the screws are left undisturbed for 4–6 weeks to allow for full bony integration between the anchorage screws (14) and the jawbone cortex. A follow-up CBCT scan confirms that the anchorage screws (14) are not loose or displaced before proceeding to the next step.

[0031] Device Assembly: The bilateral retention bands of the posterior tooth retention unit 4 are bonded and fixed to the crowns of the patient's bilateral molars. After the adhesive has completely cured, the spiral arch retraction device connection unit 2 is installed, and the bilateral telescopic arms 6 are fixedly connected to the extension connecting arms of the bilateral posterior tooth retention units 4. Then, the rigid connection support unit 3 is aligned and installed on the top abutments of the four anchorage screws 14, and rigidly locked with fixing screws. Finally, the spiral rod force application unit 1 is assembled, and the first connecting seats 9 at both ends of the adjusting screw 7 are connected to the bilateral telescopic arms 6, completing the standardized installation of the entire device.

[0032] Postoperative force adjustment: One week after the device is fully assembled and locked, and after the patient's oral mucosa has fully adapted to the device and there are no adverse reactions such as mucosal pressure damage, the first force adjustment is performed. The doctor inserts a special tool into the adjustment hole 8 and rotates the adjustment screw 7 to drive the bilateral telescopic arms 6 to retract synchronously, applying an initial light force. A standardized follow-up cycle of 4 to 6 weeks is set throughout the treatment. During each follow-up visit, the adjustment screw 7 is rotated synchronously and symmetrically to uniformly and progressively output bony retraction force, precisely controlling the amount of anterior jawbone retraction displacement. The clinically standardized bony retraction range is 2 to 5 mm.

[0033] Bony maintenance and device removal: When clinical examination confirms complete correction of the patient's bony protrusion deformity, restoration of facial harmony, and CBCT confirms completion of jawbone remodeling, force adjustment is discontinued. The entire rigid device is retained as a skeletal retainer and worn for 12–18 months. After the skeletal maintenance period ends and the jawbone morphology and occlusal relationship are confirmed to be completely stable, the components are disassembled sequentially in the order of "dynamic force application components first, then static retention components." Finally, the four anchorage screws are removed minimally invasively. The removal incision for implanted anchorage screws is small, requires no sutures, and heals quickly on its own.

[0034] Example 2: This embodiment provides a 5D bionic minimally invasive adjustable mandibular protrusion retraction device, which is mainly suitable for the correction of mandibular bony protrusion, especially for cases in which a mandibular buccal anchorage screw is implanted.

[0035] Please refer to Figure 3 The device mainly includes a bilaterally adjustable force-applying screw assembly 10, a rigid connection framework assembly 13, a posterior tooth retention assembly 11, and a buccal implant anchorage assembly 12. The bilaterally adjustable force-applying screw assembly 10 is used to output bony retraction force; the rigid connection framework assembly 13 is fixedly connected to the front end of the bilaterally adjustable force-applying screw assembly 10; the posterior tooth retention assembly 11 is fixedly connected to the rear end of the bilaterally adjustable force-applying screw assembly 10; the buccal implant anchorage assembly 12 is implanted in the buccal cortex of the mandible, providing bony anchorage for the rigid connection framework assembly 13. In use, by adjusting the controllable bony retraction force output by the bilaterally adjustable force-applying screw assembly 10, the rigid connection framework assembly 13 drives the anterior portion of the jawbone, alveolar bone, and anterior teeth to retract posteriorly and inwardly.

[0036] The main difference between this embodiment and Embodiment 1 is that the implantation site of the anchorage screw is changed from the palatal or lingual side to the buccal side, and the spiral retractor connecting unit is omitted. Because the mandibular buccal cortex is dense and the interdental spaces are small, this embodiment concentrates the anchorage screws in the dense buccal cortical bone region between the bilateral second premolars and first molars. This region has the largest interdental spaces, the highest cortical bone density, and no inferior alveolar nerve trunk, making it the optimal implantation site for the mandibular buccal anchorage screws. This perfectly matches the anatomical characteristics of the densely distributed mandibular tooth roots and high bone hardness, effectively avoiding root puncture, compression, and stress damage.

[0037] Specifically, please refer to Figure 3 , Figure 4 and Figure 6The buccal implant anchorage assembly 12 includes four anchorage screws 14, which are symmetrically distributed in a rectangular pattern in the buccal cortical bone region between the second premolar and the first molar on both sides. Two screws are located on each side, near the buccal root bifurcation area of ​​the second premolar and the first molar, respectively. This symmetrical rectangular distribution of the four anchorage screws 14 significantly improves the overall stiffness of the anchorage frame compared to traditional single-point and double-point anchorage structures. Through mechanical function balance, it completely offsets the reverse torque generated by anterior tooth retraction, ensuring that all orthodontic reaction forces are borne by the anchorage screws 14 and the jawbone base, completely separating them from the traditional force-bearing system of posterior tooth roots and crowns. The anchorage screws 14 are also miniature pure titanium implant anchorage screws, with a diameter of 1.5 mm and a length of 10 mm, and can be individually adjusted according to the patient's CBCT test results.

[0038] Please refer to Figure 3 The rigid connection framework assembly 13 is integrally cast from medical-grade stainless steel, with a smooth, rounded surface free of sharp corners and burrs, effectively preventing friction and pressure damage to the buccal oral mucosa. The rigid connection framework assembly 13 is rigidly locked to the four buccal anchorage screws 14, forming a closed rectangular rigid frame. Utilizing the mechanical dispersion principle of the anchorage screw frame, the locally concentrated orthodontic stress is evenly distributed throughout the entire skeletal anchorage system, significantly reducing the risk of micro-displacement of a single anchorage screw, cortical bone stress damage, and localized root overload. As the core force transmission point in the anterior part, the rigid connection framework assembly 13 precisely defines the movement trajectory of the anterior jawbone, crown, and root. Through rigid constraints, it controls the movement ratio of the crown and root, avoiding the non-ideal movement patterns of rapid crown tilting and delayed root displacement in traditional orthodontic treatments. It maintains the parallelism of the anterior tooth roots throughout the process, achieving synchronous coordination of bone remodeling, root movement, and crown displacement. Please refer to Figure 3 and Figure 5The dual-sided adjustable force-applying screw assembly 10 includes two adjustable screw rods 16, symmetrically arranged on the buccal side and extending from back to front along the mandibular dental arch. Each adjustable screw rod 16 has a second connecting seat 15 at both its front and rear ends, which are connected to the end of the adjustable screw rod 16 via precision threads. Specifically, the front second connecting seat 15 is threadedly fixed to the rigid connection support assembly 13, and the rear second connecting seat 15 is threadedly fixed to the posterior tooth retention assembly 11. The adjustable screw rods 16 are made of high-precision medical-grade stainless steel, exhibiting extremely high rigidity, no deformation, and no force decay, achieving a precise contraction of 0.2 mm per rotation. Through precision thread scale adjustment, the screw contraction displacement and orthodontic force value can be quantitatively controlled, achieving micron-level precise force application and strictly matching the mandibular bone remodeling rate and the safe threshold for tooth root movement. The dual-sided adjustable screw rod 16 allows for synchronous and symmetrical adjustment throughout the entire process, ensuring that the force, displacement, and torque on both sides are completely equal. This avoids problems such as jawbone deviation, crown displacement, and asymmetrical root offset caused by uneven force, and ensures that the mandibular anterior bone segment, tooth root, and crown always maintain parallel movement.

[0039] The posterior tooth retention assembly 11 is the core retention and mechanical support structure at the rear end of the device, symmetrically arranged in the bilateral mandibular posterior tooth region. The posterior tooth retention assembly 11 includes bilaterally symmetrically arranged individualized cast metal retention bands. The inner wall of the retention bands perfectly conforms to the anatomical shape of the molar crown and is tightly bonded to the crown using dental resin adhesive. Each retention band has a rigid extension connecting arm integrally molded on its buccal side. The entire assembly is cast seamlessly without stress-prone areas, extending horizontally forward and featuring standardized threaded connection points for fixed connection to the second connecting seat 15 at the rear end of the adjustable screw rod 16. Relying on surface-wrapping retention, the retention bands evenly distribute the orthodontic reverse force across the entire molar crown, avoiding localized stress concentration on the crown and single-point overload on the root. This allows for long-term continuous resistance to skeletal retraction reverse orthodontic forces without the risk of loosening or dislodgement.

[0040] Similar to Embodiment 1, the rigid screw in the bilaterally adjustable force-applying screw assembly 10 of this embodiment can also be flexibly replaced with elastic or semi-elastic force source components such as a pull-ring type elastic traction device, a medical silicone core rubber band, or a precision spring assembly, depending on the patient's specific condition. The pull-ring type elastic traction device is suitable for patients who require directional bias torque control and have small jawbone displacement but significant angular deviation; the rubber band continuous light force traction device is suitable for patients with low bone density, thin cortical bone, and who require long-term low-intensity stimulation to activate bone remodeling; the precision spring type progressive loading device is suitable for patients with thick cortical bone, high initial resistance, and who require gradually increasing force values ​​as bone remodeling progresses. All of the above-mentioned alternative components are compatible with the original fixation interface and threaded connection specifications.

[0041] Working principle: Preoperative preparation and site localization: The patient underwent a comprehensive oral CBCT scan to accurately measure the thickness of the buccal cortex, bone density, and interdental distance of the mandibular buccal bone, and the buccal cortex region between the second premolar and the first molar on both sides was determined as the anchorage screw implantation site.

[0042] Minimally invasive implantation of anchorage screws: After routine disinfection and draping of the surgical area, local infiltration anesthesia was administered. Four anchorage screws (14) were minimally invasively implanted in the buccal cortical bone region between the second premolars and first molars on both sides, arranged in a rectangular symmetrical pattern. Postoperatively, the screws were left to rest for 4–6 weeks to allow for full osseointegration with the mandibular cortex.

[0043] Device assembly: The bilateral retention bands of the posterior tooth retention component 11 are bonded and fixed to the crowns of the patient's bilateral mandibular molars. After the adhesive has completely cured, the rigid connection support component 13 is aligned and installed on the top abutments of the four anchorage screws 14, and rigidly locked in place with fixing screws. Subsequently, the bilateral adjustable force-applying screw components 10 are assembled. The second connecting seat 15 at the rear end of each adjustable screw 16 is threaded and locked to the extension connecting arm of the posterior tooth retention component 11, and the second connecting seat 15 at the front end is threaded and locked to the rigid connection support component 13, thus constructing a complete anterior-posterior force transmission path.

[0044] Postoperative force adjustment: One week after the device is fully assembled and locked, and after the patient's oral mucosa has fully adapted to the device, the first force adjustment is performed. The doctor performs synchronous and symmetrical fine-tuning of the bilateral adjustable spiral rods 16, applying an initial light force. A standardized follow-up visit cycle of 4-6 weeks is set throughout the treatment. At each follow-up visit, the bilateral adjustable spiral rods 16 are rotated synchronously and symmetrically to precisely control the amount of anterior jawbone retraction displacement. The clinically standardized bony retraction range is 2-5 mm.

[0045] Bony maintenance and device removal: When clinical examination confirms that the patient's mandibular prognathism has been completely corrected, facial profile has been restored to harmony, and CBCT confirms that the basal remodeling of the jawbone has been completed, the force adjustment is stopped. The entire rigid device is retained as a skeletal maintainer and worn for 12–18 months. After that, the components are removed one by one, and finally, the four anchorage screws are removed minimally invasively.

[0046] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A 5D bionic minimally invasive adjustable mandibular protrusion retraction device, characterized in that: Includes a helical rod force application unit (1) for outputting bony adduction force; Spiral arch retractor connection unit (2) is used to enhance the overall support stiffness of the posterior teeth; The rigid connection support unit (3) is connected to the front end of the screw rod force application unit (1); The posterior tooth retention unit (4) is connected to the spiral arch retraction device connection unit (2); An anchorage nail (14) is inserted into the cortical bone of the jawbone after passing through the rigid connection frame unit (3) to provide bony anchorage for the rigid connection frame unit (3); By adjusting the helical rod force application unit (1), the rigid connection support unit (3) is driven to move the anterior jawbone, alveolar bone and anterior teeth as a whole backward and inward.

2. The 5D bionic minimally invasive adjustable mandibular protrusion retraction device according to claim 1, characterized in that: The screw rod force application unit (1) includes an adjusting screw (7) and first connecting seats (9) respectively connected to both ends of the adjusting screw (7). A telescopic arm (6) is also provided between the two first connecting seats (9). An adjusting component is also threaded on the circumferential side of the adjusting screw (7). Several adjusting holes (8) are opened on the circumferential side of the adjusting component. By inserting a tool into the adjusting hole (8) and rotating the adjusting screw (7), the telescopic arms (6) on both sides are driven to retract synchronously to enhance the overall support stiffness of the posterior tooth.

3. The 5D bionic minimally invasive adjustable mandibular protrusion retraction device according to claim 1, characterized in that: The anchorage screw (14) is provided in four pieces, and the four anchorage screws (14) are symmetrically distributed in a rectangular shape on the palatal part of the maxilla or the lingual side of the mandible; the rigid connection bracket unit (3) is provided with an installation hole (5), and the anchorage screw (14) is inserted into the cortical bone of the jawbone after passing through the installation hole (5).

4. A 5D biomimetic adjustable mandibular protrusion retraction device, characterized in that, include: A dual-sided adjustable force-applying screw assembly (10) is used to output bony adduction force; The rigid connection bracket assembly (13) is connected to the front end of the dual-sided adjustable force-applying screw assembly (10); The posterior tooth retention assembly (11) is connected to the rear end of the bilateral adjustable force-applying screw assembly (10); A buccal implant anchorage assembly (12) is implanted in the buccal cortex to provide bony anchorage for the rigid connection scaffold assembly (13); By adjusting the dual-sided adjustable force-applying screw assembly (10), the rigid connection bracket assembly (13) is driven to move the anterior jawbone, alveolar bone and anterior teeth as a whole backward and inward.

5. The 5D bionic minimally invasive adjustable mandibular protrusion retraction device according to claim 4, characterized in that: The buccal implant anchorage assembly (12) includes four anchorage screws (14), which are symmetrically distributed in a rectangular shape in the buccal cortical bone region between the second premolar and the first molar on both sides.

6. The 5D bionic minimally invasive adjustable mandibular protrusion retraction device according to claim 4, characterized in that: The dual-sided adjustable force-applying screw assembly (10) includes two adjustable screw rods (16) on the left and right sides, and the two adjustable screw rods (16) are symmetrically arranged on the cheek side.

7. A 5D bionic minimally invasive adjustable mandibular protrusion retraction device according to claim 6, characterized in that: Each of the adjustable screw rods (16) has a second connecting seat (15) at both the front and rear ends. The second connecting seat (15) at the front end is connected to the rigid connecting bracket assembly (13), and the second connecting seat (15) at the rear end is connected to the posterior tooth retention assembly (11).

8. The 5D biomimetic adjustable maxillary and mandibular protrusion retraction device according to claim 7, characterized in that: The second connecting seat (15) and the adjustable screw rod (16), the second connecting seat (15) and the rigid connecting bracket assembly (13), and the second connecting seat (15) and the posterior tooth retention assembly (11) are all threaded connections.

9. The 5D biomimetic adjustable maxillary and mandibular protrusion retraction device according to claim 1, characterized in that: The anchorage nail (14) is a miniature pure titanium implant anchorage nail.

10. The 5D biomimetic adjustable maxillary and mandibular protrusion retraction device according to claim 1, characterized in that: Both the screw force application unit (1) and the double-sided adjustable force application screw assembly (10) are made of medical stainless steel.

Images