Titanium mesh positioning system for oral and maxillofacial bone defect repair surgery based on dynamic navigation
By using a dynamic navigation system to prepare pre-made holes during the fixation of the titanium mesh scaffold through pre-operative planning and real-time navigation, the precise alignment and fixation of the titanium mesh can be achieved. This solves the problems of low fixation accuracy and high cost in existing technologies, and improves surgical efficiency and precision.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SICHUAN UNIV
- Filing Date
- 2026-05-25
- Publication Date
- 2026-07-10
AI Technical Summary
Existing technologies for titanium mesh fixation have low fixation accuracy and rely on the doctor's experience. Solid guide plate solutions have fitting errors, high costs, and are greatly affected by the intraoperative environment, making it difficult to achieve high-precision and flexible titanium mesh fixation.
A titanium mesh placement system based on dynamic navigation was adopted for oral and maxillofacial bone defect repair surgery. The system constructs a three-dimensional model of the titanium mesh and plans the fixation hole parameters through the preoperative planning module. Combined with the dynamic navigation module, the system tracks the surgical execution module in real time, prepares pre-made holes, and uses fixation devices to fix the titanium mesh to the bone surface to achieve precise alignment.
It significantly improves the fixation accuracy and repeatability of titanium mesh, reduces reliance on surgeon experience, minimizes repeated fitting and secondary drilling, improves surgical efficiency, and provides an objective means of accuracy assessment.
Smart Images
Figure CN122350877A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical devices and navigation technology, specifically to a titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation. Background Technology
[0002] In maxillofacial bone defect repair surgery, implantable mesh scaffolds (such as titanium mesh) are commonly used to create a stable osteogenic space. Currently, there are two main methods for placing and fixing titanium mesh. The first is manual manipulation, which relies entirely on the surgeon's clinical experience and skills to place the titanium mesh scaffold and implant fixators. However, in actual surgery, due to the complexity of human anatomy and individual differences, manual manipulation makes it difficult to guarantee accurate positioning and stable fixation of the titanium mesh, especially in high-precision surgeries such as bone defect repair. The second method uses pre-fabricated solid guides for assistance, such as compression retainer-type titanium mesh placement guides or 3D-printed pinhole guides. While these types of surgical guides can improve precision to some extent, they have several drawbacks: First, the design and manufacturing of these guides are time-consuming and costly; second, during surgery, the guides need to fit closely to the patient's bone surface or dentition, but due to the obstruction and interference of soft tissue and blood, as well as the unevenness of the bone surface itself, it is difficult to achieve an ideal fit, and any fit error will directly translate into the final fixation error; finally, the size of solid surgical guides limits the surgical field of view and the operating space for instruments.
[0003] Therefore, existing technologies have problems such as low fixation accuracy of titanium mesh stents, reliance on doctors' experience, and fit errors, high cost, and great interference from the intraoperative environment in solid guide plate solutions. There is an urgent need for a fixation method that does not require a solid guide plate, is more flexible, and can guarantee high precision. Summary of the Invention
[0004] To address the shortcomings of the prior art, this invention provides a titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation, which improves the fixation accuracy and repeatability of the titanium mesh.
[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows: A titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation includes a preoperative planning module, a dynamic navigation module, a surgical execution module, a titanium mesh, and fixation components; The preoperative planning module is used to construct a three-dimensional model of the titanium mesh based on the patient's medical imaging data; and to plan at least two parameters for fixing holes for fixing the titanium mesh on the three-dimensional model of the titanium mesh, wherein the fixing hole parameters include at least three-dimensional spatial coordinates, implantation axis and drilling depth; The dynamic navigation module is communicatively connected to the preoperative planning module, and is used to receive the fixed hole parameters sent by the preoperative planning module, and to track the position, angle and depth of the surgical execution module in real time during the operation, and to provide feedback on the deviation of the surgical execution module from the planning target. The surgical execution module is used to prepare pre-made holes on the patient's bone surface according to the fixation hole parameters planned by the preoperative planning module, under the guidance of the dynamic navigation module. The titanium mesh is identical to the three-dimensional model of the titanium mesh constructed by the preoperative planning module, and it has fixing holes that correspond one-to-one with the pre-made holes; the fixing member is used to pass through the fixing holes of the titanium mesh and the pre-made holes on the bone surface to fix the titanium mesh to the patient's bone surface.
[0006] As a preferred technical solution, the preoperative planning module is also used to design an ideal bone increment profile for repairing bone defects, and generate a matching personalized titanium mesh 3D model based on the ideal bone increment profile.
[0007] As a preferred technical solution, the fixing hole includes at least one positioning hole and several auxiliary holes. The positioning hole is used for initial anchoring of the titanium mesh, and the auxiliary holes are used for subsequent fixing to prevent the bracket from shifting.
[0008] As a preferred technical solution, the dynamic navigation module includes a tracking and positioning system, a calibration plate, and a reference device rigidly connected to the patient. The surgical execution module is equipped with positioning marks. The tracking and positioning system tracks the patient's head position in real time through the reference device rigidly connected to the patient, and tracks the real-time position and posture of the surgical execution module through the positioning marks on the surgical execution module, and registers the two with the preoperatively loaded planning data.
[0009] As a preferred technical solution, the system also includes a postoperative verification module, which includes a positioning component that is detachably connected to the titanium mesh. The dynamic navigation module is further used to track the positioning component and record the final actual placement position of the titanium mesh as intraoperative data. The postoperative verification module is used to acquire postoperative image data of the patient and compare the postoperative image data with the preoperative planning model using point cloud analysis to quantitatively evaluate the final placement deviation of the titanium mesh.
[0010] As a preferred technical solution, the medical imaging data includes the patient's CBCT imaging data and intraoral scan data.
[0011] As a preferred technical solution, the surgical execution module is a drilling handpiece.
[0012] As a preferred technical solution, the pre-made hole is one of a shallow guide hole, a through hole, or a graded enlargement hole structure.
[0013] As a preferred technical solution, the titanium mesh scaffold is one of the following: a pre-formed mesh before surgery, a mesh for intraoperative fine-tuning, or a personalized 3D printed mesh.
[0014] As a preferred technical solution, the fixation element is a self-tapping titanium screw or a micro bone screw.
[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention relates to a dynamic navigation-based intraoperative titanium mesh placement system for oral and maxillofacial bone defect repair. The system utilizes a preoperative planning module to construct a three-dimensional model of the titanium mesh based on the patient's medical imaging data and pre-sets the parameters of the fixation holes. Guided by the dynamic navigation module, the surgical execution module drills pre-drilled holes according to the pre-set parameters, ensuring that the pre-drilled holes match the parameters of the pre-set fixation holes. Precise alignment of the titanium mesh installation is achieved by matching the fixation holes on the titanium mesh with the pre-drilled holes on the bone surface, and locking is performed using a fixation device. This significantly improves the fixation accuracy and repeatability of the titanium mesh.
[0016] The titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation of the present invention can reduce the dependence on the surgeon's experience through quantitative and visualized dynamic spatial guidance. While ensuring accuracy, it can reduce repeated trial fitting and secondary drilling, form a replicable standardized process, and improve surgical efficiency.
[0017] The titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation of the present invention quantifies the placement accuracy through a postoperative verification module, providing reliable data support for objective evaluation of surgical quality, improvement of doctors' skills and continuous improvement of technical procedures, and solving the problem of traditional methods lacking objective and quantitative accuracy assessment means. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 It is an alveolar ridge bone defect model reconstructed based on the patient's CBCT data and an ideal bone increment profile designed; Figure 2 It is a three-dimensional schematic diagram of the planned fixing holes; Figure 3 This is a schematic diagram of the cross-section of the planned fixing hole; Figure 4 This is a sagittal plane schematic diagram of the planned fixing hole; Figure 5This is a schematic diagram of the coronal plane of the planned fixed hole. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0021] A titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation includes a preoperative planning module, a dynamic navigation module, a surgical execution module, a titanium mesh, and fixation components.
[0022] The preoperative planning module is used to construct a three-dimensional model of the titanium mesh based on the patient's medical imaging data; and to plan at least two parameters for fixing holes for fixing the titanium mesh on the three-dimensional model of the titanium mesh, wherein the fixing hole parameters include at least three-dimensional spatial coordinates, implantation axis and drilling depth; The dynamic navigation module is communicatively connected to the preoperative planning module, and is used to receive the fixed hole parameters sent by the preoperative planning module, and to track the position, angle and depth of the surgical execution module in real time during the operation, and to provide feedback on the deviation of the surgical execution module from the planning target. The surgical execution module is used to prepare pre-made holes on the patient's bone surface according to the fixation hole parameters planned by the preoperative planning module, under the guidance of the dynamic navigation module. The titanium mesh is identical to the three-dimensional model of the titanium mesh constructed by the preoperative planning module, and it has fixing holes that correspond one-to-one with the pre-made holes; the fixing member is used to pass through the fixing holes of the titanium mesh and the pre-made holes on the bone surface to fix the titanium mesh to the patient's bone surface.
[0023] Furthermore, the preoperative planning module first reconstructs a model of the alveolar ridge defect based on the patient's medical imaging data (such as...). Figure 1 (As shown in the middle left figure), then design the ideal bone augmentation profile for repairing bone defects (such as...). Figure 1 As shown in the right figure (middle), the ideal bone increment profile is derived by reversing the position of the target prosthesis; and a matching personalized titanium mesh 3D model is generated based on the ideal bone increment profile. The medical imaging data includes the patient's CBCT (cone-beam CT) image data and intraoral scan data. Among the fixation hole parameters, such as... Figures 2-5 As shown, the three-dimensional spatial coordinates determine the precise landing point of the fixation hole on the bone surface, the implantation axis defines the correct direction for the fixator to enter the bone tissue to obtain good retention force and avoid important anatomical structures, and the drilling depth controls the depth of the hole to prevent excessive drilling and damage to nerves, blood vessels, and other tissues. Preferably, the fixation hole includes at least one positioning hole and several auxiliary holes. The positioning hole is used for initial anchoring of the titanium mesh, and the auxiliary holes are used for subsequent fixation to prevent the support from shifting. When locking the fixator, the fixator at the positioning hole is locked first, and then the fixators at the remaining auxiliary hole positions are locked in a diagonally alternating order to achieve fixation of the titanium mesh and equalize the fixation stress.
[0024] The dynamic navigation module includes a tracking and positioning system, a calibration plate, and a reference device rigidly connected to the patient. The surgical execution module is equipped with positioning markers. The tracking and positioning system tracks the patient's head position in real time through the reference device rigidly connected to the patient, and tracks the real-time position and orientation of the surgical execution module through the positioning markers on the surgical execution module, registering both with pre-loaded planning data. Preferably, the surgical execution module is a drill handpiece.
[0025] Preferably, the pre-fabricated hole can be one of a shallow guide hole, a through hole, or a graded enlargement structure. The titanium mesh support is one of a pre-formed mesh before surgery, a mesh for intraoperative fine-tuning, or a personalized 3D-printed mesh. The fixation element is a self-tapping titanium screw, a micro bone screw, or an equivalent bone fixation element.
[0026] Furthermore, it also includes a postoperative verification module, which includes a positioning component that is detachably connected to the titanium mesh; the dynamic navigation module is also used to track the positioning component and record the final actual placement position of the titanium mesh as intraoperative data; the postoperative verification module is used to acquire the patient's postoperative image data and compare the postoperative image data with the preoperative planning model using point cloud analysis to quantitatively evaluate the final placement deviation of the titanium mesh.
[0027] The method for fixing titanium mesh using the aforementioned dynamic navigation-based titanium mesh placement system in oral and maxillofacial bone defect repair surgery includes: S1: Collect CBCT and intraoral scan data, establish an alveolar ridge bone defect model, and design an ideal bone increment profile for repairing the bone defect. The ideal bone increment profile is obtained by back-calculation based on the position of the target restoration. S2: Generate a matching personalized three-dimensional model of titanium mesh based on the ideal bone increment contour; plan at least two parameters for fixing holes for fixing the titanium mesh on the three-dimensional model of titanium mesh, wherein the fixing hole parameters include at least three-dimensional spatial coordinates, implantation axis and drilling depth; S3: The dynamic navigation module completes patient registration and surgical execution module calibration; S4: The surgical execution module is guided by the dynamic navigation module to prepare pre-made holes on the patient's bone surface corresponding to the fixation holes; preferably, the positioning holes are prepared first, and then the auxiliary holes are prepared. S5: According to the position of the pre-made holes, place the titanium mesh and align the fixing holes on the titanium mesh with the pre-made holes one by one; S6: Implant the fasteners (e.g., titanium nails) in a preset order and lock them one by one; the preset order is: priority for positioning holes, followed by diagonal alternation. S7: Verify edge adhesion and stability; S8: The final actual placement position of the titanium mesh is recorded by the postoperative verification module as intraoperative data, and the postoperative image data of the patient is imported into the three-dimensional processing software to reconstruct the actual postoperative model. The actual postoperative model is compared with the preoperative planning model by point cloud to quantitatively evaluate the final placement deviation of the titanium mesh.
[0028] Preoperatively, a model of the alveolar ridge bone defect was reconstructed by acquiring the patient's CBCT and intraoral scan data. Based on the restoration goals, a personalized pre-formed titanium mesh 3D model was designed, and the positions of at least two fixation holes were planned.
[0029] After the surgery begins, intraoperative registration and calibration are performed first. The reference device is fixed to the patient's zygomatic arch area using a fixation device. The position of the reference device is continuously monitored by the tracking and positioning system. The surgical execution module to be used for positioning is calibrated using a calibration plate. After the patient registration is completed, the virtual model in the dynamic navigation system achieves a precise spatial correspondence with the real patient.
[0030] The doctor holds the pre-marked surgical execution module and, guided by the display of the dynamic navigation system, moves the surgical execution module to the planned position of the positioning hole. Based on the real-time feedback of position, angle, and depth deviations on the display screen, the doctor fine-tunes the surgical execution module until all deviation values are within the allowable range. Then, the doctor starts drilling until the preset depth is reached, and drills all the pre-made holes in sequence.
[0031] The pre-formed titanium mesh is placed in the surgical area, aligning its corresponding fixation holes with the prepared pre-drilled holes. Due to the precise hole positioning, the alignment process is very rapid. The first fixation piece is inserted into the positioning hole, completing the initial anchoring of the titanium mesh. The remaining fixation pieces are then inserted into the auxiliary holes in a diagonally alternating sequence and tightened one by one.
[0032] After the surgery, intraoperative data recording the final fixation position of the titanium mesh was exported. Postoperative CBCT scans were taken for the patient, and the image data was imported into 3D processing software to reconstruct the actual postoperative model. The postoperative actual model was compared with the preoperative planned model using point cloud analysis to quantitatively assess the final placement deviation of the titanium mesh, thus forming a complete technical loop.
[0033] In this invention, the positions of the pre-drilled holes are precisely prepared based on the hole positions on the titanium mesh model, enabling rapid and accurate alignment. After alignment, the titanium mesh is fixed to the bone surface by passing a fastener (such as a titanium nail) through the aligned fixing hole and the pre-drilled hole. This "holes first, mesh later" process utilizes precise physical holes as positioning references, fundamentally ensuring the final positioning accuracy of the titanium mesh and solving the problems of repeated trial fittings, position adjustments, and hole mismatch caused by bracket deformation in traditional methods.
[0034] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.
Claims
1. A titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation, characterized in that: Includes preoperative planning module, dynamic navigation module, surgical execution module, titanium mesh and fixation components; The preoperative planning module is used to construct a three-dimensional model of the titanium mesh based on the patient's medical imaging data; and to plan at least two parameters for fixing holes for fixing the titanium mesh on the three-dimensional model of the titanium mesh, wherein the fixing hole parameters include at least three-dimensional spatial coordinates, implantation axis and drilling depth; The dynamic navigation module is communicatively connected to the preoperative planning module, and is used to receive the fixed hole parameters sent by the preoperative planning module, and to track the position, angle and depth of the surgical execution module in real time during the operation, and to provide feedback on the deviation of the surgical execution module from the planning target. The surgical execution module is used to prepare pre-made holes on the patient's bone surface according to the fixation hole parameters planned by the preoperative planning module, under the guidance of the dynamic navigation module. The titanium mesh is identical to the three-dimensional model of the titanium mesh constructed by the preoperative planning module, and it has fixing holes that correspond one-to-one with the pre-made holes; the fixing member is used to pass through the fixing holes of the titanium mesh and the pre-made holes on the bone surface to fix the titanium mesh to the patient's bone surface.
2. The titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation according to claim 1, characterized in that: The preoperative planning module is also used to design an ideal bone augmentation profile for repairing bone defects and generate a matching personalized titanium mesh 3D model based on the ideal bone augmentation profile.
3. The titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation according to claim 1 or 2, characterized in that: The fixing hole includes at least one positioning hole and several auxiliary holes. The positioning hole is used for initial anchoring of the titanium mesh, and the auxiliary holes are used for subsequent fixing to prevent the bracket from shifting.
4. The titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation according to claim 1, characterized in that: The dynamic navigation module includes a tracking and positioning system, a calibration plate, and a reference device rigidly connected to the patient. The surgical execution module is equipped with positioning markers. The tracking and positioning system tracks the patient's head position in real time through the reference device rigidly connected to the patient, and tracks the real-time position and posture of the surgical execution module through the positioning markers on the surgical execution module, and registers the two with the pre-operatively loaded planning data.
5. The titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation according to claim 4, characterized in that: It also includes a postoperative verification module, which includes a positioning component that is detachably connected to the titanium mesh; the dynamic navigation module is also used to track the positioning component and record the final actual placement position of the titanium mesh as intraoperative data; the postoperative verification module is used to acquire the patient's postoperative imaging data and compare the postoperative imaging data with the preoperative planning model using point cloud analysis to quantitatively evaluate the final placement deviation of the titanium mesh.
6. The titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation according to claim 1, characterized in that: The medical imaging data includes the patient's CBCT imaging data and intraoral scan data.
7. The titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation according to claim 1, characterized in that: The surgical execution module is a drilling handpiece.
8. The titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation according to claim 1, characterized in that: The pre-drilled hole is one of the following: shallow guide hole, through hole, or graded enlargement hole structure.
9. The titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation according to claim 1, characterized in that: The titanium mesh scaffold is one of the following: a pre-formed mesh before surgery, a mesh that is finely adjusted during surgery, or a personalized 3D printed mesh.
10. The titanium mesh placement system for oral and maxillofacial bone defect repair surgery based on dynamic navigation according to claim 1, characterized in that: The fastener is a self-tapping titanium screw or a micro bone screw.