Multi-directionally adjustable maxillofacial region retractor for treating Kruzone syndrome

Abstract

The invention provides a multidirectional adjustable maxillofacial region tractor for treating Kruzone syndrome, which comprises an external fixing bracket, a skull fixing screw, a traction bracket assembly and a traction steel wire, and is characterized in that the external fixing bracket is fixedly connected to a craniofacial bone of a patient through the skull fixing screw; the external fixing support comprises a support frame capable of adjusting the left-right width and the front-back length according to the craniofacial anatomical features of a patient, and an adjustable connecting piece connected with the traction support assembly and capable of adjusting the left-right width and the front-back length at the front portion of the support frame and adjusting the overall height of the traction support assembly. The traction support assembly comprises a traction support connecting rod and a multidirectional traction adjusting assembly connected with the traction support connecting rod, the traction support connecting rod is vertically connected to the adjustable connecting piece, and the multidirectional traction adjusting assembly is connected with a traction steel wire. The method is high in adaptation flexibility, and clinical diversified requirements can be better met.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, more specifically, to the field of craniomaxillofacial surgical traction treatment equipment, and particularly relates to a multi-directionally adjustable maxillofacial traction device for treating Crouzon syndrome. Background Art

[0002] Craniofacial dysplasia syndromes are complex conditions involving underdevelopment of the skull and facial bones, typically requiring structural intervention and morphological correction with external fixators and traction devices. With the interdisciplinary development of medical engineering and orthopedics, adjustable maxillofacial devices are increasingly being used in the treatment of various craniofacial deformities, including Crouzon syndrome, to assist in spatial reconstruction of the affected area.

[0003] Existing external traction devices for the craniofacial region are mostly based on frame structures, combining external fixation with bone traction to transmit tissue tension. Some devices can adjust the traction force and structural positioning through component connections. However, due to the inherent simplification and standardization of the structural design, these existing devices still have significant shortcomings in terms of adjustment range, adjustment direction, connection method, and degree of matching with individual facial structures. They often rely on precise preoperative positioning, making real-time adjustment during surgery inconvenient.

[0004] Traditional devices struggle to achieve rapid adaptation and multi-dimensional fine-tuning, especially when faced with anatomical differences between patients. Adjustment is often limited to a single direction or a coarse level, making it difficult to meet the higher demands for operational flexibility, traction stability, and spatial precision in clinical practice. Therefore, developing an external traction device that can better adapt to the craniofacial characteristics of different patients and provide multi-dimensional fine-tuning capabilities is a key issue that needs to be addressed in current technology. Summary of the Invention

[0005] The present application provides a multi-directionally adjustable maxillofacial traction device for treating Crouzon syndrome, which is used to solve the problems in the prior art of difficulty in flexibly adapting to the craniofacial structures of different patients and limited adjustment dimensions.

[0006] The present application provides a multi-directionally adjustable maxillofacial traction device for treating Crouzon syndrome, comprising an external fixator, a skull fixation screw, a traction support assembly and a traction wire, wherein the external fixator is used to be fixedly connected to the patient's craniofacial bones through the skull fixation screw, the external fixator comprises a support frame that can adapt to the patient's craniofacial anatomical features to adjust the left and right width and front and back length, and an adjustable connector connected to the traction support assembly that can be adjusted left and right at the front of the support frame and adjust the overall height of the traction support assembly; the traction support assembly comprises a traction support connecting rod and a multi-directional traction adjustment assembly connected to the traction support connecting rod, the traction support connecting rod is vertically connected to the adjustable connector, the multi-directional traction adjustment assembly is connected to the traction wire, and is used to perform spatial multi-dimensional adjustment of the traction direction and traction point position of the traction wire, and the multi-directional traction adjustment assembly has an H-shaped layout and multi-axis adjustable screw slider mechanism.

[0007] In an optional embodiment, the support frame includes two bilaterally symmetrically arranged semi-annular support bodies, two fixed bases, a transverse adjustment screw and a guide connecting plate; The two semi-circular support bodies are respectively arranged on the left and right sides of the patient's craniofacial bones and are connected between the front parts of the two by the lateral adjustment screw. The left and right ends of the rod body of the lateral adjustment screw are respectively provided with positive and negative thread structures and are connected with the two semi-circular support bodies in a threaded matching manner. The lateral adjustment screw can drive the two semi-circular support bodies to move in opposite directions when rotating to achieve left and right spacing width adjustment of the two support frames. The front positions of the two semi-circular support bodies are also respectively provided with fixing screws that can limit the rotation of the lateral adjustment screws. The sides of the two semi-circular support bodies are provided with operating holes for the rotation operation of the lateral adjustment screws. The two fixed bases are respectively slidably arranged below the rear parts of the two semi-circular support bodies and can adjust the fixed position along the front and rear directions of the semi-circular support bodies. A bearing is installed in the middle of the lateral adjustment screw and is connected to the guide connecting plate through the bearing. The guide connecting plate is slidably connected to the adjustable connecting piece which can be adjusted and fixed on the guide connecting plate.

[0008] In an optional embodiment, a connecting hole is provided at an upper position on one side of the rear end of the fixing base, and an adjustment screw is threadedly connected to the connecting hole. The front end of the fixing base extends to the interior of the rear end of the semi-circular bracket body and is threadedly connected together. The adjustment screw can adjust the front and rear position of the fixing base at the rear of the semi-circular bracket body when rotated. The fixing base is also provided with a plurality of through holes for connecting to the skull fixing screws.

[0009] In an optional embodiment, the adjustable connection member includes a slider, a first locking screw and a second locking screw; The rear position of the slider is provided with the first locking screw connected to the guide connecting plate for fixing the position of the slider after the slider is adjusted left and right. The front position of the slider is vertically provided with a vertical through hole for passing the traction bracket connecting rod. The front position of the slider is also provided with the second locking screw for fixing the position of the traction bracket connecting rod after the height of the slider is adjusted.

[0010] In an optional embodiment, the guide connecting plate includes a connecting block for mounting the bearing and a support plate integrally connected to the connecting block, the support plate is arranged above the connecting block and the lower bottom surfaces at both ends are in contact with the upper surfaces of the two semi-circular bracket bodies; a locking groove for connecting the first locking screw is provided at the rear position of the upper surface of the support plate, and two runway-shaped through-holes arranged symmetrically on the left and right are also provided on the upper surface of the support plate to expose the fixing screws.

[0011] In an optional embodiment, the support frame further includes two guide rods, the two guide rods are connected to the guide connecting plate, and the two ends of the two guide rods are movably provided in the front end portions of the two semi-annular support bodies.

[0012] In an optional embodiment, the multi-directional traction adjustment assembly includes a first traction slider disposed on the traction bracket connecting rod, a transversely disposed traction cross bar, two second traction sliders symmetrically disposed on the left and right sides of the traction cross bar, traction screws respectively passed through the two second traction sliders, and a traction push block threadably pushed on each of the traction screws; The first traction slider is connected to the middle of the traction cross bar, and the first traction slider is connected to the traction bracket connecting rod. The traction cross bar can be slid left and right on the first traction slider and is locked and fixed at a set position by a transverse locking piece on the first traction slider. The first traction slider can slide up and down along the traction bracket connecting rod and is locked and fixed at a set position by a vertical locking piece on the first traction slider. The second traction slider can slide left and right along the traction cross bar and can rotate on the traction cross bar. The second traction slider is locked and fixed at a set position by a position locking piece on the second traction slider. The bottom ends of the two traction screw rods are respectively provided with steel wire connection holes for fixing the traction wires. The two traction screw rods are respectively vertically penetrated and arranged on the two second traction sliders and can rotate around their own axes to adjust the connection position of the traction screw rods on the second traction sliders. Each of the traction screw rods is threadedly connected to a traction propulsion block, and the traction propulsion block is located on the upper part of the second traction slider. The traction propulsion block can be locked and fixed after the traction screw rod is rotated to the set position.

[0013] In an optional embodiment, the number of the multi-directional traction adjustment components is at least 2, the front end of the traction bracket connecting rod is provided with a vertical reserved locking groove arranged vertically and capable of locking and fixing the first traction slider; the front end middle section of the traction cross bar is provided with a horizontal reserved locking groove arranged horizontally and capable of locking and fixing the first traction slider; the traction cross bar is provided with a reference scale line for horizontal position adjustment, and the horizontal locking piece, the vertical locking piece and the position locking piece are all hexagonal bolts.

[0014] In an optional embodiment, the traction wire is made of stainless steel or memory alloy material with a customized curved path to adapt to the patient's maxillofacial contour; the external fixator is made of anodized aluminum alloy material; the traction bracket connecting rod is made of carbon fiber composite material, and the skull fixation screw is made of medical titanium alloy.

[0015] In an optional embodiment, the lower end of the fixed base is an arc-shaped structure.

[0016] Compared with the prior art, this application has the following beneficial effects: 1. The present application provides a multi-directionally adjustable maxillofacial traction device for treating Crouzon syndrome. The maxillofacial traction device introduces an external fixator with spatial adjustment capabilities in its structural design. The external fixator is installed on the surface of the patient's craniofacial bones through skull fixation screws and can be used as the basic positioning unit of the entire traction structure. The external fixator is provided with a support frame that can be adjusted to the left and right width and front and back length to adapt to the patient's craniofacial anatomical features. By adjusting the front and back length and left and right width of the support frame, a pre-positioning operation that fits the individual facial morphology can be achieved. This flexible adjustment of the length and width of the support frame can be targeted according to the craniofacial contours of different patients. Compared with traditional fixation devices, this type of structure helps to quickly complete size matching before surgery or during use, thereby reducing the discomfort caused by the inconsistency between the fixation site and the patient's anatomical differences, and enhancing the accuracy of the initial installation and individual adaptability. By adjusting the frame structure of the bracket, fine-tuning can be performed according to the actual shape of the facial bones during the adjustment process, which helps to reduce discomfort or looseness caused by size mismatch, thereby improving the fit between the device and the patient's face, and making the external fixator have a certain degree of adaptability to better meet diverse clinical needs.

[0017] 2. The present application provides an adjustable connector located at the front of the support frame, and connects it to the traction support assembly. The adjustable connector has the function of adjusting itself in the horizontal direction and adjusting the traction support connecting rod in the vertical direction, and can guide the traction support connecting rod to move flexibly in the left and right and up and down directions. With the help of this two-dimensional adjustment structure, combined adjustment is achieved, and the force application range is expanded. The doctor can adjust the traction force application path based on the actual position of the lesion area and the treatment needs, so that the traction point can more accurately correspond to the required correction part of the face. In actual application, it helps to reduce the correction deviation caused by the deviation of the force angle, improve the flexibility and accuracy of traction positioning, thereby improving the overall device's responsiveness to changes in the force direction and enhancing the flexibility of the treatment strategy.

[0018] 3. The traction bracket assembly of the present application is provided with a vertically mounted traction bracket connecting rod and a multi-directional traction adjustment assembly connected thereto. The multi-directional traction adjustment assembly has an H-shaped screw slider mechanism with multi-axis adjustment, which supports fine displacement adjustment in multiple axes, so that the traction wire can be positioned and the traction path adjusted in multiple directions in space. This design structure allows physicians to flexibly adjust the traction angle and position in multiple axes according to the treatment stage or correction process, thereby improving the adaptability of the traction path, and can reduce the limitations of the traditional structure in which the force direction is single or the direction needs to be changed by replacing parts, so that the traction direction can be gradually corrected according to changes in the clinical process, thereby enhancing the continuity and adaptability of the treatment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 A schematic structural diagram of a multi-directionally adjustable maxillofacial retractor for treating Crouzon syndrome provided in one embodiment of the present application; Figure 2 A schematic diagram of another perspective of a multi-directionally adjustable maxillofacial retractor for treating Crouzon syndrome provided by an embodiment of the present application; Figure 3 A schematic diagram of another perspective of a multi-directionally adjustable maxillofacial retractor for treating Crouzon syndrome provided by an embodiment of the present application; Figure 4 A schematic structural diagram of an external fixation bracket provided in one embodiment of the present application; Figure 5 A schematic diagram illustrating the connection between a traction bracket connecting rod and a multi-directional traction adjustment assembly in a traction bracket assembly provided in one embodiment of the present application; Figure 6 for Figure 4 A partial enlarged view of point A in the middle.

[0021] Description of reference numerals: 100, external fixing bracket; 110, bracket frame; 120, adjustable connector; 121, slider; 1211, vertical through hole; 122, first locking screw; 123, second locking screw; 111, semi-circular bracket body; 1111, fixing screw; 112, fixing base; 1121, adjustment screw; 1122, through hole; 113, horizontal adjustment screw; 1131, bearing; 114, guide connecting plate; 1141, connecting block; 1 142. Support plate; 115. Guide rod; 200. Skull fixation screw; 300. Traction bracket assembly; 310. Traction bracket connecting rod; 320. Multi-directional traction adjustment assembly; 321. First traction slider; 3211. Horizontal locking member; 3212. Vertical locking member; 322. Traction cross bar; 323. Second traction slider; 3231. Position locking member; 324. Traction wire rod; 3241. Steel wire connection hole; 325. Traction push block. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of this application.

[0023] See also Figures 1-6 The embodiment of the present application provides a multi-directionally adjustable maxillofacial traction device for treating Crouzon syndrome, comprising an external fixator 100, a skull fixation screw 200, a traction support assembly 300 and a traction wire. The external fixator 100 is used to be fixedly connected to the patient's craniofacial bones through the skull fixation screw 200. The external fixator 100 includes a support frame 110 that can be adjusted to the left and right width and front and back length according to the patient's craniofacial anatomical features, and a support frame 110 connected to the traction support assembly 300 that can be adjusted left and right at the front of the support frame 110. The adjustable connector 120 is used to integrate and adjust the overall height of the traction bracket assembly 300; the traction bracket assembly 300 includes a traction bracket connecting rod 310 and a multi-directional traction adjustment assembly 320 connected to the traction bracket connecting rod 310. The traction bracket connecting rod 310 is vertically connected to the adjustable connector 120. The multi-directional traction adjustment assembly 320 is connected to a traction steel wire for spatial multi-dimensional adjustment of the traction direction and traction point position of the traction steel wire. The multi-directional traction adjustment assembly 320 has an H-shaped layout and multi-axis adjustable screw slider mechanism.

[0024] The maxillofacial distractor provided in this embodiment incorporates a spatially adjustable external fixator 100 in its structural design. Installed on the patient's craniofacial bone surface via skull screws 200, the external fixator 100 serves as the basic positioning unit for the entire distraction structure. The external fixator 100 includes a support frame 110 that can be adjusted in width and length to suit the patient's craniofacial anatomy. Adjusting the front-to-back length and width of the support frame 110 allows for pre-positioning to individual facial features. This flexible adjustment of the length and width of the support frame 110 allows for tailored fit to individual patient craniofacial contours. Compared to traditional fixation devices, this structure facilitates rapid size matching before surgery or during use, reducing discomfort caused by differences in fixation location and patient anatomy, and enhancing initial installation accuracy and individual adaptability. By adjusting the structure of the support frame 110, fine-tuning can be performed according to the actual shape of the facial bones during the adjustment process, which helps to reduce discomfort or looseness caused by size mismatch, thereby improving the fit between the device and the patient's face, and making the external fixator 100 have a certain degree of adaptability to better meet diverse clinical needs.

[0025] Furthermore, in order to facilitate the adjustment of the traction force direction and the position of the traction point, the present embodiment provides an adjustable connector 120 located at the front of the support frame 110, and connects it to the traction support assembly 300. The adjustable connector 120 has the function of adjusting itself in the horizontal direction and adjusting the traction support connecting rod 310 in the vertical direction, and can guide the traction support connecting rod 310 to move flexibly in the left and right and up and down directions. With the help of this two-dimensional adjustment structure, combined adjustment is achieved, and the force application range is expanded. The doctor can adjust the traction force application path based on the actual location of the lesion area and the treatment needs, so that the traction point can more accurately correspond to the required facial correction part. In actual application, it helps to reduce the correction deviation caused by the deviation of the force angle, improve the flexibility and accuracy of traction positioning, thereby improving the overall device's responsiveness to changes in the force direction and enhancing the flexibility of the treatment strategy.

[0026] On this basis, a vertically mounted traction support connecting rod 310 and a multi-directional traction adjustment assembly 320 connected thereto are provided in the traction support assembly 300. The multi-directional traction adjustment assembly 320 has an H-shaped screw slider mechanism with multi-axis adjustment, which supports fine displacement adjustment in multiple axes, so that the traction wire can be positioned and the traction path adjusted in multiple directions in space. This design structure allows physicians to flexibly adjust the traction angle and position in multiple axes according to the treatment stage or correction process, thereby improving the adaptability of the traction path, reducing the limitations of traditional structures with a single force direction or the need to replace components to change direction, facilitating the gradual correction of the traction direction according to changes during the clinical process, and enhancing the continuity and adaptability of the treatment process.

[0027] In some embodiments, the support frame 110 includes two left-right symmetrically arranged semi-circular support bodies 111 , two fixed bases 112 , a lateral adjustment screw 113 and a guide connecting plate 114 .

[0028] Among them, the two semi-circular bracket bodies 111 are respectively arranged on the left and right sides of the patient's cranial facial bones, and are connected between the front parts of the two by a lateral adjustment screw 113. The left and right ends of the rod body of the lateral adjustment screw 113 are respectively provided with positive and negative thread structures and are connected with the two semi-circular bracket bodies 111 in a threaded matching manner. The lateral adjustment screw 113 can drive the two semi-circular bracket bodies 111 to move in opposite directions when rotating to achieve the left and right spacing width adjustment of the two bracket frames 110. The front positions of the two semi-circular bracket bodies 111 are also respectively provided with fixing screws 1111 that can limit the rotation of the lateral adjustment screw 113. The sides of the two semi-circular bracket bodies 111 are provided with operating holes for the rotation operation of the lateral adjustment screw 113. The two fixed bases 112 are respectively slidably arranged at the lower rear parts of the two semi-circular bracket bodies 111 and can adjust the fixed position along the front and rear directions of the semi-circular bracket bodies 111.

[0029] A bearing 1131 is installed in the middle of the lateral adjustment screw 113 and is connected to the guide connecting plate 114 through the bearing 1131. An adjustable connecting member 120 is slidably connected to the guide connecting plate 114 and can be adjusted and fixed on the guide connecting plate 114.

[0030] In the above embodiment, the stent frame 110 is arranged in a bilaterally symmetrical manner and is composed of two semi-circular stent bodies 111, which are respectively arranged on both sides of the patient's cranial face to form an enveloping annular support structure. This can effectively disperse the support load in actual use and reduce the structural offset phenomenon caused by unilateral force. The front parts of the two semi-circular stent bodies 111 are connected by a transverse adjustment screw 113. The setting of the positive and negative threads enables the semi-circular stent bodies 111 on the left and right sides to move synchronously in opposite directions during the rotation of the transverse adjustment screw 113, thereby achieving synchronous adjustment of the spacing. In use, the spacing setting of the stent frame 110 can be quickly completed according to the width of the patient's head and face, which helps to improve the efficiency and accuracy of the initial positioning before surgery.

[0031] At the same time, the middle portion of the lateral adjustment screw 113 is supported for rotation by bearing 1131, the outer periphery of which is connected to the guide connecting plate 114, providing a stable rotation center for the adjustment process. The bearing structure reduces rotational resistance, which helps to reduce the manual force required for manual operation and improve the smoothness of the rotation process. The guide connecting plate 114 serves as a connecting platform, not only supporting the rotating components of the lateral adjustment screw 113, but also providing a positioning reference for the installation of the adjustable connector 120, thereby forming a structurally reliable force transmission path that connects the upper and lower parts.

[0032] In addition, the fixed base 112 is arranged below the rear of the corresponding semi-circular bracket body 111, and is given position adjustability in the front-to-back direction through sliding. This structural design enhances the adaptability of the traction device in the front-to-back direction, which is beneficial for coping with changes in the skull shape of different patients. In traditional fixed part structures, the rear part is mostly rigidly connected, and the traction point often deviates from the target area. In this embodiment, since the fixed base 112 can be adjusted front and back, the doctor can adjust the front and back position of the fixed base 112 according to the specific facial structure, thereby further correcting the traction path and traction angle, improving the accuracy of the subsequent traction wire layout, and thereby enhancing the overall individual fitting ability and operational flexibility of the device.

[0033] In some embodiments, a connection hole is provided at an upper position on one side of the rear end of the fixed base 112, and an adjustment screw 1121 is threadedly connected to the connection hole. The front end of the fixed base 112 extends to the interior of the rear end of the semi-circular bracket body 111 and is threadedly connected together. The adjustment screw 1121 can adjust the front and rear position of the fixed base 112 at the rear of the semi-circular bracket body 111 during rotation. The fixed base 112 is also provided with a plurality of through holes 1122 for connecting with the skull fixing screw 200.

[0034] In the above embodiment, the structural design of the fixed base 112 is further refined to give it the ability to be fine-tuned in the front-to-back direction. Specifically, a connecting hole is provided above the rear end of the fixed base 112, and cooperates with the adjustment screw 1121 to form a set of threaded adjustment mechanisms, and the front end area of ​​the fixed base 112 is connected to the interior of the corresponding semi-circular bracket body 111 by a threaded manner, forming a stable fit in structure. When the adjustment screw 1121 is rotated, the fixed base 112 can be finely displaced in the front-to-back direction relative to the semi-circular bracket body 111, thereby providing the operator with a more precise adjustment means. This adjustment function facilitates the fine correction of the installation position of the fixed base 112 according to the actual contour characteristics of the patient's craniofacial bones after the initial positioning is completed, which helps to improve the matching degree of the skull fixing screw 200 and the bone surface contact to a certain extent, reduce the impact of the installation angle deviation, and avoid abnormal stress concentration in local areas.

[0035] Furthermore, to further enhance flexibility in adapting to varying bone conditions, the fixation base 112 is provided with multiple through-holes 1122, providing the surgeon with multiple installation options during clinical practice. The surgeon can select the optimal screw installation hole location based on the patient's bone hardness and anatomical characteristics, thereby optimizing operational flexibility and achieving optimal fixation.

[0036] In some embodiments, the adjustable connection member 120 includes a slider 121 , a first locking screw 122 , and a second locking screw 123 .

[0037] Among them, a first locking screw 122 connected to the guide connecting plate 114 is provided at the rear position of the slider 121 for fixing the position after the slider 121 is adjusted left and right, and a vertical through hole 1211 for passing the traction bracket connecting rod 310 is vertically opened at the front position of the slider 121. A second locking screw 123 is also provided at the front position of the slider 121 for fixing the position of the traction bracket connecting rod 310 after the height of the slider 121 is adjusted.

[0038] The above embodiment further optimizes the structure of the adjustable connector 120 to enhance the flexibility and stability of the traction support connecting rod 310 in terms of positioning and adjustment. The slider 121 serves as the primary adjustment unit, with its rear portion connected to the guide connecting plate 114 via a first locking screw 122. After the slider 121 completes its left-right movement and adjustment, it can be locked in position promptly via this locking structure, thereby reducing slip errors caused by external force disturbances during surgery. A vertical through-hole 1211 is provided at the front of the slider 121 for inserting the traction support connecting rod 310, allowing it to slide freely in the vertical direction, facilitating adjustment of the traction point height.

[0039] At the same time, this embodiment cooperates with the second locking screw 123 set at the front of the slider 121, which can further fix the height position after the traction bracket connecting rod 310 is adjusted up and down, thereby enhancing the stability of the overall structure. This connection method adopts a design concept of separating left and right sliding and up and down sliding, which is conducive to the surgeon to perform step-by-step adjustment operations according to the different craniofacial features of the patient. The adjustment freedom brought by the sliding fit helps to improve the efficiency of clinical positioning. Overall, this structural combination provides a more flexible adjustment mechanism for the traction device, enhances the ability of the device to adapt to different individual differences, and can maintain a relatively stable traction state during both intraoperative and postoperative use.

[0040] In some embodiments, the guide connecting plate 114 includes a connecting block 1141 for installing the bearing 1131 and a support plate 1142 integrally connected to the connecting block 1141. The support plate 1142 is arranged above the connecting block 1141 and the lower bottom surfaces at both ends are in contact with the upper surfaces of the two semi-circular bracket bodies 111; a locking groove for connecting the first locking screw 122 is provided at the rear position of the upper surface of the support plate 1142, and two runway-shaped through-holes arranged symmetrically on the left and right are also provided on the upper surface of the support plate 1142 to expose the fixing screws 1111.

[0041] In this embodiment, the structure of the guide connecting plate 114 has been carefully optimized to improve the connection stability and adjustment convenience of the device. The guide connecting plate 114 is formed as a whole by a connecting block 1141 and a support plate 1142, wherein the connecting block 1141 is used to install a bearing 1131 to connect the lateral adjustment screw 113, thereby facilitating the smooth operation of the lateral adjustment screw 113 during rotation, reducing the resistance caused by friction, and enhancing the support capacity of the structure in the adjustment state. The support plate 1142 is arranged above the connecting block 1141, and the lower bottom surfaces at both ends are in contact with the upper surfaces of the two semi-circular bracket bodies 111, forming a stable upper support platform, which helps to improve the load-bearing efficiency of the connection part while maintaining the overall rigidity.

[0042] Furthermore, a locking groove is provided at the rear position of the support plate 1142 to provide a positioning interface for the first locking screw 122, and to enhance the locking reliability of the slider 121 in the horizontal direction through locking fit. In order to take into account the actual needs of clinical operations, two runway-shaped perforations are also provided on the upper surface of the support plate 1142, which are symmetrically arranged on the left and right, so as to reveal the position of the fixing screws 1111 below and to complete the necessary adjustments and observations without removing the guide connecting plate 114. This structural design that integrates load-bearing, guiding, locking fit and visual adjustment functions not only improves the coordination between components, but also brings more convenience to the positioning and adjustment operations during surgery. Overall, this structural layout helps to improve the control stability of the traction device during the adjustment process, and further enhances the adaptability of the device and the efficiency of clinical operations.

[0043] In some embodiments, the support frame 110 further includes two guide rods 115 , which are connected to the guide connecting plate 114 , and both ends of the two guide rods 115 are movably provided in the front end portions of the two semi-annular support bodies 111 .

[0044] In this embodiment, by adding two guide rods 115 to the support frame 110, the stability and fit precision of the lateral adjustment screw 113 during adjustment can be further improved. The two guide rods 115 penetrate the guide connecting plate 114 and are respectively located in the front end areas of the two semi-annular support bodies 111, thereby establishing a rigid guide path between the left and right semi-annular support bodies 111. This through-hole arrangement ensures that the support frame 110 is more stable during lateral adjustment at the structural level.

[0045] From a structural perspective, the provision of guide rod 115 provides a clearer trajectory for the guide connecting plate 114 during relative movement, mitigating the tendency for structural deflection and improving the ability to control straightness during adjustment, thus facilitating the maintenance of parallelism between the two semi-annular bracket bodies 111 on the left and right sides. In terms of functional coordination, this guide structure also serves as a reference guide, providing a clear spatial reference for the subsequent positioning and installation of the adjustable connector 120 and the traction bracket assembly 300, helping to improve the consistency of the overall assembly and maintain relatively stable repeatable positioning accuracy during multiple adjustment operations.

[0046] In some embodiments, the multi-directional traction adjustment assembly 320 includes a first traction slider 321 arranged on the traction bracket connecting rod 310, a transversely arranged traction cross bar 322, two second traction sliders 323 symmetrically arranged on the left and right sides of the traction cross bar 322, traction screw rods 324 respectively passed through the two second traction sliders 323, and a traction pushing block 325 that can be threadedly pushed on each traction screw rod 324.

[0047] Among them, a first traction slider 321 is connected to the middle of the traction cross bar 322, and the first traction slider 321 is connected to the traction bracket connecting rod 310. The traction cross bar 322 can slide left and right on the first traction slider 321 and be locked and fixed at a set position by the horizontal locking piece 3211 on the first traction slider 321. The first traction slider 321 can slide up and down along the traction bracket connecting rod 310 and be locked and fixed at a set position by the vertical locking piece 3212 on the first traction slider 321. The second traction slider 323 can slide left and right along the traction cross bar 322 and can rotate on the traction cross bar 322. The second traction slider 323 is locked and fixed at a set position by the position locking piece 3231 on the second traction slider 323.

[0048] The bottom ends of the two traction screw rods 324 are respectively provided with steel wire connection holes 3241 for fixing the traction wires. The two traction screw rods 324 are respectively vertically penetrated and arranged on the two second traction sliders 323 and can rotate around their own axes to adjust the connection position of the traction screw rods 324 on the second traction sliders 323. A traction propulsion block 325 is threadedly connected to each traction screw rod 324. The traction propulsion block 325 is located on the upper part of the second traction slider 323. The traction propulsion block 325 can be locked and fixed after the traction screw rod 324 is rotated to the set position.

[0049] In this embodiment, to achieve graded adjustment of the traction height and lateral direction, a first traction slider 321 is provided in the multi-directional traction adjustment assembly 320. This first traction slider 321 structurally serves two functions: on the one hand, it cooperates with the traction support connecting rod 310 to allow vertical movement up and down; on the other hand, it is provided with a traction crossbar 322, allowing the traction crossbar 322 to slide horizontally within it. Furthermore, through the cooperation of the vertical locking member 3212 and the transverse locking member 3211, the operator can position the traction structure at the target height and transverse position as needed, thereby improving adjustment accuracy. The combination of the first traction slider 321, the vertical locking member 3212, and the transverse locking member 3211 ensures a good control rhythm throughout the adjustment process, while enhancing the stability of repeated adjustments and making it easier to obtain a clear traction reference position during operation.

[0050] In order to improve the flexibility of setting the spacing and direction of the traction points, a second traction slider 323 is respectively installed at both ends of the traction cross bar 322. The second traction slider 323 can slide horizontally on the traction cross bar 322, and combined with the second traction slider 323 having the rotatable feature on the traction cross bar 322, this design allows the spacing between the left and right traction points to be flexibly set according to different facial anatomical conditions, and the spatial orientation of the traction wire rod 324 can be adjusted by rotating the second traction slider 323. Locking with the position locking member 3231 can achieve fine-tuning of the angle while maintaining the stability of the device, thereby enhancing the adaptability of the device in dealing with various types of craniofacial deformities. Structurally, this sliding and rotating method helps to expand the adjustment range of the traction force direction and is suitable for a wider range of clinical use scenarios.

[0051] In addition, a traction screw rod 324 is vertically arranged on each second traction slider 323, and a steel wire connection hole 3241 is provided at the bottom end of the traction screw rod 324 for installing and fixing the traction wire. The traction screw rod 324 drives the traction propulsion block 325 to move up and down along the spiral trajectory through rotation, thereby realizing micro-adjustment of the vertical position of the traction point. This structure utilizes the self-locking characteristics of the threaded transmission, and can finely control the traction depth through the rotation angle, so that the physician can gradually adjust the traction tension according to the lesion area during the treatment process. This method helps to reduce the discomfort caused to the patient by sudden stress changes, and is also conducive to fine-tuning the traction path according to the recovery progress at different stages of correction. Overall, the traction structure has a compact layout and clear adjustment logic, which is convenient for operation and control during and after surgery, and provides structural support for the realization of refined and multi-dimensional traction treatment.

[0052] In some embodiments, the number of multi-directional traction adjustment components 320 is at least 2, and the front end of the traction bracket connecting rod 310 is provided with a vertical reserved locking groove that is arranged vertically and can be used to lock and fix the first traction slider 321; the front end middle section of the traction cross bar 322 is provided with a horizontal reserved locking groove that is arranged horizontally and can be used to lock and fix the first traction slider 321; the traction cross bar 322 is provided with a reference scale line for horizontal position adjustment, and the horizontal locking piece 3211, the vertical locking piece 3212 and the position locking piece 3231 are all hexagonal bolts.

[0053] In the above embodiment, a vertical locking groove is provided at the front end of the traction support connecting rod 310, and a horizontal locking groove is provided in the middle section of the traction crossbar 322. These two structures provide a clear positioning reference for the vertical and horizontal movement of the first traction slider 321, allowing the operator to quickly determine the appropriate locking point during adjustment, helping to reduce errors caused by position offset and improving adjustment efficiency.

[0054] To further enhance intuitive adjustment, symmetrically arranged reference scale lines are added to the outer surface of the traction crossbar 322. This visual marking provides a quantitative basis for adjusting the left and right traction points, facilitating standardized management during clinical procedures. During surgery, the physician can directly make fine adjustments and comparisons by reading the scale positions, facilitating rapid correction of symmetrical traction and improving overall adjustment consistency.

[0055] Furthermore, to simplify the operation process, the locking components are uniformly constructed using hexagonal bolts, including multiple functional nodes: a horizontal locking member 3211, a vertical locking member 3212, and a position locking member 3231. This standardized design allows for uniform tooling, requiring only common screw tools to perform multiple locking operations. This approach not only lowers the barrier to entry but also provides greater convenience during intraoperative adjustments and postoperative maintenance.

[0056] In some embodiments, the traction wire is made of stainless steel or memory alloy with a customized curved path to adapt to the patient's maxillofacial contour; the external fixator 100 is made of anodized aluminum alloy; the traction bracket connecting rod 310 is made of carbon fiber composite material, and the skull fixation screw 200 is made of medical titanium alloy.

[0057] In this embodiment, the traction wire is made of stainless steel or memory alloy and has a pre-set, customizable curved path. This allows it to conform to the complex contours of the maxillofacial area while better distributing the traction force, thereby reducing localized stress concentration. This design helps reduce pressure on the skin and soft tissues, improving wearer tolerance.

[0058] Furthermore, the external fixator 100 is constructed entirely of anodized aluminum alloy, offering high structural rigidity and excellent corrosion resistance. This reduces the overall weight of the traction device, making it less burdensome for the patient. This helps maintain structural stability and surface cleanliness over extended periods of use, reducing the burden of routine maintenance. The traction support connecting rod 310 is constructed from a carbon fiber composite material, significantly lighter than metal while still possessing sufficient mechanical strength. This reduces the overall weight of the device and helps minimize sustained load on the patient's face, making prolonged traction therapy more feasible.

[0059] The skull fixation screws 200 used for positioning and fixation are made of medical titanium alloy, which has excellent biocompatibility and bone bonding ability. This can reduce inflammation and infection risks after surgery while improving the stability of fixation to bone tissue. This combination of materials and structures takes into account mechanical support, biosafety, and clinical use, balancing strength, lightweightness, and adaptability. Without increasing the complexity of the device, it helps to improve the wearing experience and stability during treatment.

[0060] In some embodiments, the lower end of the fixed base 112 is an arc-shaped structure.

[0061] In the structural design of the fixed base 112, this embodiment sets its lower end as an arc-shaped structure, which not only saves the use of materials and reduces the weight of the fixed base 112, but also the design of the lower end of the fixed base 112 as an arc-shaped structure helps it to better fit the curved contour of the patient's craniofacial area when worn. Although this structure does not directly contact the skin, since it is connected to the patient's skull through the skull fixing screw 200, the shape of its bottom surface will affect the fit of the auxiliary cushion layer between the skin and the degree of adaptability of the overall structure to the craniofacial shape. The design of the arc-shaped bottom can, to a certain extent, alleviate the stress concentration caused by local protrusions or angular structures, thereby reducing the risk of compression caused by the uneven pressure exerted by the base structure on the subcutaneous tissue.

[0062] The following is a process for using the multi-directionally adjustable maxillofacial retractor for treating Crouzon syndrome according to an embodiment of the present application: Before clinical use, the doctor first conducts preliminary debugging of the device based on the patient's craniofacial anatomy. During the preoperative preparation phase, the external fixator 100 is positioned in conjunction with the two semi-circular support bodies 111. The rotational adjustment function of the lateral adjustment screw 113 adjusts the spacing between the two semi-circular support bodies 111 to accommodate the head shape and width requirements of different patients. Subsequently, by adjusting the adjustment screw 1121, the front-to-back position of the fixed base 112 is matched, ensuring that the overall support frame 110 fits the patient's craniofacial area. After adjustment, the through-holes are selected in the appropriate locations, and the skull fixation screws 200 are used to securely attach the fixed base 112 to the skull surface, providing a support base for subsequent traction operations.

[0063] After completing the initial positioning of the device, the traction assembly adjustment phase begins. The doctor adjusts the slider 121 in the adjustable connector 120 to precisely fine-tune the traction support connecting rod 310 in the vertical and left-right directions. The slider 121 is fixed to the guide connecting plate 114 via a first locking screw 122. The front vertical perforation 1211 is provided for the traction support connecting rod 310 to pass through. After adjustment, it is locked with a second locking screw 123 to achieve precise spatial positioning. This operation phase, combined with patient imaging data, allows for personalized traction point setting, facilitating the stable execution of the subsequent traction path.

[0064] Next, the doctor connects the traction wire to the multi-directional traction adjustment assembly 320. The first traction slider 321 in the assembly is installed on the traction bracket connecting rod 310 and is positioned in height by the vertical locking piece 3212; the traction cross bar 322 is passed through the first traction slider 321 and can be locked by the cross locking piece 3211 after sliding horizontally. The second traction slider 323 is located at both ends of the traction cross bar 322, can slide horizontally and has a rotation adjustment function, and the position locking piece 3231 is used to fix the position after adjustment. The traction wire rod 324 vertically passes through the second traction slider 323, and a wire connection hole 3241 is provided at the bottom thereof for the installation of the traction wire. The upper end is threadedly engaged with the traction push block 325. Rotating the push block can realize the up and down displacement of the traction wire, thereby forming a tension-controlled traction structure.

[0065] Throughout the treatment cycle, the doctor can adjust the rotation angle of the traction propulsion block 325 based on the patient's recovery, thereby fine-tuning the position of the traction screw 324 and controlling the vertical traction depth of the traction points. If clinical adjustment of the traction angle or change in the spacing between traction points is necessary, the position locking member 3231 can be loosened and the direction and distribution of the traction screw 324 can be reset by moving or rotating the second traction slider 323. Furthermore, the reference scale lines on the traction crossbar 322 provide an intuitive displacement reference, improving the efficiency of adjusting the traction symmetry on both sides and facilitating precise adjustments based on the patient's condition.

[0066] After treatment is complete, each locking component is released and the traction wire is removed. Subsequently, the skull fixation screws 200 are removed, and the external fixator 100 and associated connection components are removed. Because the lower end of the fixed base 112 is curved, it conforms well to the craniofacial area, effectively dissipating localized pressure throughout the wear process and alleviating discomfort caused by prolonged wear. The lightweight design of the structural material, combined with the multi-axis adjustment structure, facilitates excellent clinical adaptability and treatment continuity, providing a stable, highly adjustable mechanical support platform for the corrective treatment of craniofacial deformities.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A multi-directionally adjustable maxillofacial traction device for treating Crouzon syndrome, characterized in that: The invention comprises an external fixator (100), a skull fixation screw (200), a traction support assembly (300) and a traction wire, wherein the external fixator (100) is used to be fixedly connected to the craniofacial bones of the patient through the skull fixation screw (200), and the external fixator (100) comprises a support frame (110) capable of adjusting the left and right width and the front and back length according to the anatomical features of the craniofacial area of ​​the patient, and a movable support connected to the traction support assembly (300) capable of adjusting the left and right width and the overall height of the traction support assembly (300) at the front of the support frame (110). The traction support assembly (300) comprises a traction support connecting rod (310) and a multi-directional traction adjustment assembly (320) connected to the traction support connecting rod (310), wherein the traction support connecting rod (310) is vertically connected to the adjustable connecting member (120), and the multi-directional traction adjustment assembly (320) is connected to the traction steel wire and is used for spatially multi-dimensionally adjusting the traction direction and traction point position of the traction steel wire, and the multi-directional traction adjustment assembly (320) has an H-shaped layout and a multi-axis adjustable screw slider mechanism.

2. The multi-directionally adjustable maxillofacial traction device for treating Crouzon syndrome according to claim 1, characterized in that: The support frame (110) comprises two semi-annular support bodies (111) symmetrically arranged on both sides, two fixed bases (112), a transverse adjustment screw (113) and a guide connecting plate (114); The two semi-circular support bodies (111) are respectively arranged on the left and right sides of the patient's cranial facial bones, and are connected between the front parts of the two through the transverse adjustment screw (113). The left and right ends of the rod body of the transverse adjustment screw (113) are respectively provided with positive and negative thread structures and are connected with the two semi-circular support bodies (111) in a threaded matching manner. The transverse adjustment screw (113) can drive the two semi-circular support bodies (111) to move in opposite directions when rotating, so as to achieve a left-right spacing width of the two support frames (110). The two semi-circular support bodies (111) are respectively provided with fixing screws (1111) capable of limiting the rotation of the lateral adjustment screw (113) at the front positions, and the two semi-circular support bodies (111) are respectively provided with operation holes for the lateral adjustment screw (113) to rotate. The two fixed bases (112) are respectively slidably provided at the rear lower parts of the two semi-circular support bodies (111) and can adjust the fixed position along the front and rear directions of the semi-circular support bodies (111); A bearing (1131) is installed in the middle of the lateral adjustment screw (113) and is connected to the guide connecting plate (114) via the bearing (1131). The guide connecting plate (114) is slidably connected to the adjustable connecting member (120) which can be adjusted and fixed on the guide connecting plate (114).

3. The multi-directionally adjustable maxillofacial traction device for treating Crouzon syndrome according to claim 2, characterized in that: A connection hole is provided at an upper position on one side of the rear end of the fixed base (112), and an adjustment screw (1121) is threadedly connected to the connection hole. The front end of the fixed base (112) extends to the inside of the rear end of the semi-circular bracket body (111) and is threadedly connected together. The adjustment screw (1121) can adjust the front and rear position of the fixed base (112) at the rear of the semi-circular bracket body (111) when rotating. The fixed base (112) is also provided with a plurality of through holes (1122) for connecting with the skull fixing screw (200).

4. The multi-directionally adjustable maxillofacial traction device for treating Crouzon syndrome according to claim 2 or 3, characterized in that: The adjustable connecting member (120) comprises a slider (121), a first locking screw (122) and a second locking screw (123); The rear portion of the slider (121) is provided with a first locking screw (122) connected to the guide connecting plate (114) for fixing the position of the slider (121) after the slider (121) is adjusted left and right. A vertical through hole (1211) for passing the traction bracket connecting rod (310) is vertically opened at the front portion of the slider (121). The front portion of the slider (121) is also provided with a second locking screw (123) for fixing the position of the traction bracket connecting rod (310) after the height of the slider (121) is adjusted.

5. The multi-directionally adjustable maxillofacial retractor for treating Crouzon syndrome according to claim 4, characterized in that: The guide connecting plate (114) includes a connecting block (1141) for mounting the bearing (1131) and a support plate (1142) integrally connected to the connecting block (1141), wherein the support plate (1142) is arranged above the connecting block (1141) and the lower bottom surfaces at both ends are in contact with the upper surfaces of the two semi-annular bracket bodies (111); a locking groove for connecting the first locking screw (122) is provided at the rear position of the upper surface of the support plate (1142), and two runway-shaped through-holes arranged symmetrically on the left and right are provided on the upper surface of the support plate (1142) to expose the fixing screw (1111).

6. The multi-directionally adjustable maxillofacial retractor for treating Crouzon syndrome according to claim 2 or 3, characterized in that: The support frame (110) further includes two guide rods (115), the two guide rods (115) are connected to the guide connecting plate (114), and the two ends of the two guide rods (115) are movably inserted into the front end portions of the two semi-annular support bodies (111).

7. The multi-directionally adjustable maxillofacial retractor for treating Crouzon syndrome according to claim 1, characterized in that: The multi-directional traction adjustment assembly (320) includes a first traction slider (321) arranged on the traction bracket connecting rod (310), a transversely arranged traction cross bar (322), two second traction sliders (323) symmetrically arranged on the left and right sides of the traction cross bar (322), traction screw rods (324) respectively passed through the two second traction sliders (323), and a traction pushing block (325) that can be threadedly pushed on each of the traction screw rods (324); The first traction slider (321) is connected to the middle of the traction cross bar (322), and the first traction slider (321) is connected to the traction bracket connecting rod (310). The traction cross bar (322) can be slid left and right on the first traction slider (321) and locked and fixed at a set position by a transverse locking piece (3211) on the first traction slider (321). The first traction slider (321) can slide up and down along the traction bracket connecting rod (310) and be locked and fixed at a set position by a vertical locking piece (3212) on the first traction slider (321). The second traction slider (323) can slide left and right along the traction cross bar (322) and can rotate on the traction cross bar (322). The second traction slider (323) is locked and fixed at a set position by a position locking piece (3231) on the second traction slider (323). The bottom ends of the two traction screw rods (324) are respectively provided with steel wire connection holes (3241) for fixing the connection of the traction steel wires. The two traction screw rods (324) are respectively vertically penetrated on the two second traction sliders (323) and can rotate around their own axes to adjust the connection position of the traction screw rods (324) on the second traction sliders (323). Each of the traction screw rods (324) is threadedly connected to a traction propulsion block (325). The traction propulsion block (325) is located on the upper part of the second traction slider (323). The traction propulsion block (325) can be locked and fixed after the traction screw rod (324) is rotated to the set position.

8. The multi-directionally adjustable maxillofacial retractor for treating Crouzon syndrome according to claim 7, characterized in that: The number of the multi-directional traction adjustment components (320) is at least two. The front end of the traction bracket connecting rod (310) is provided with a vertical reserved locking groove arranged vertically and capable of being locked and fixed by the first traction slider (321); the front middle section of the traction cross bar (322) is provided with a horizontal reserved locking groove arranged horizontally and capable of being locked and fixed by the first traction slider (321); the traction cross bar (322) is provided with a reference scale line for horizontal position adjustment, and the horizontal locking piece (3211), the vertical locking piece (3212) and the position locking piece (3231) are all hexagonal bolts.

9. The multi-directionally adjustable maxillofacial retractor for treating Crouzon syndrome according to claim 1, characterized in that: The traction wire is made of stainless steel or memory alloy with a customized curved path to adapt to the patient's maxillofacial contour; the external fixation bracket (100) is made of an anodized aluminum alloy; the traction bracket connecting rod (310) is made of carbon fiber composite material, and the skull fixation screw (200) is made of medical titanium alloy.

10. The multi-directionally adjustable maxillofacial retractor for treating Crouzon syndrome according to claim 2 or 3, characterized in that: The lower end of the fixed base (112) is an arc-shaped structure.

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