Anchorage nail implantation positioning device based on image guidance and positioning method thereof

Abstract

The invention discloses an anchorage nail implantation positioning device based on image guidance and a positioning method thereof.The device is composed of a flexible support body and a plurality of ray visible metal mark points, the device is fixed to the tooth surface of a patient through a fixing mechanism, the relation between a dot matrix and a tooth root can be clearly recognized in CBCT scanning, and a doctor judges the optimal entrance point and angle of an anchorage nail according to the relation; in addition, the structure is simple, the installation is rapid, and cross interference is avoided during preoperative and intraoperative operations; the mark dot matrix is free of artifact interference, clear in development and convenient for image navigation; 3D printing customization can be carried out according to the anatomical structure of a patient, and industrial implementation is achieved; the device is low in cost and can be repeatedly designed for different clinical scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of orthodontic treatment, and in particular to an anchorage nail implantation positioning device and a positioning method thereof based on image guidance. Background Art

[0002] In modern orthodontic treatment, anchorage pins are widely used to provide stable support force to assist tooth movement and correction. However, the current method of anchorage pin implantation mostly relies on the doctor's subjective judgment and experience for "blind insertion". It is difficult to accurately control the safe distance between the nail entry point and the adjacent tooth root or bone plate, which can easily cause accidental injury to the tooth root or penetration of the cortical bone, causing complications such as postoperative pain, inflammation and even implant failure.

[0003] CBCT (cone beam computed tomography) is a three-dimensional imaging technology that can clearly present the tooth root and surrounding bone structure. In theory, it can be used for preoperative path planning. However, in actual application, the confirmation of the anchorage pin implantation position generally adopts an L-shaped metal wire fixed to the tooth surface through structures such as brackets. This positioning method has the following technical problems: First, the L-shaped metal wire is large in size and will produce artifacts during scanning and imaging, making it impossible to accurately locate the implantation position of the anchorage pin; second, due to the lack of stable and identifiable intraoral positioning reference points, CBCT images are difficult to correspond to actual oral operations, thereby limiting its navigation function in clinical implantation. Therefore, to address the above problems, an image-guided anchorage pin implantation positioning device and positioning method thereof are proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide an image-guided anchorage nail implantation positioning device and a positioning method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] As an optional solution of the image-guided anchorage nail implantation positioning device and positioning method thereof described in the present invention, wherein: an image-guided anchorage nail implantation positioning device and positioning method thereof comprises teeth, a fixing mechanism and a bracket structure;

[0007] One side of the bracket structure made of flexible biocompatible material is inserted into the fixing mechanism, and the fixing mechanism is fixed to the tooth surface by an adhesive.

[0008] CBCT, as a three-dimensional imaging technology, can clearly present the tooth roots and surrounding bone structures. In theory, it can be used for preoperative path planning. However, in actual applications, the confirmation of the implantation position of the anchorage nail is generally achieved by fixing an L-shaped metal wire on the tooth surface through structures such as brackets. This positioning method has the following technical problems: First, the L-shaped metal wire is large in size and will produce artifacts during scanning and imaging, making it impossible to accurately locate the implantation position of the anchorage nail. Second, due to the lack of stable and identifiable intraoral positioning reference points, CBCT images are difficult to correspond to actual oral operations, which limits its navigation role in clinical implantation. By cooperating with the set fixing mechanism and bracket structure, accurate spatial judgment of the tooth root and the nail entry point in the CBCT image can be achieved, greatly improving the safety and accuracy of implantation. In addition, the structure is simple, the installation is quick, and there is no cross-interference in preoperative and intraoperative operations. The marking dot array has no artifact interference, the development is clear, and it is convenient for image navigation. It can be customized by 3D printing according to the patient's anatomical structure and has industrial feasibility. The device has low cost and can be repeatedly designed for different clinical scenarios.

[0009] As an optional solution of the image-guided anchorage nail implantation positioning device and positioning method described in the present invention, the fixing mechanism includes an adhesive portion in close contact with the adhesive, and the other side of the adhesive portion is fixedly connected to a laterally arranged fixing tube, and the surface of the fixing tube is also spirally connected to a fixing screw.

[0010] As an optional solution of the image-guided anchorage nail implantation positioning device and positioning method thereof described in the present invention, the fixing tube is hollow.

[0011] As an optional solution of the image-guided anchorage nail implantation positioning device and positioning method described in the present invention, the bonding part is arranged in a concave-convex shape on the side facing the tooth, and is used to cooperate with the adhesive to stably bond to the tooth surface.

[0012] When installing the fixing mechanism, the recommended placement area is the buccal area of ​​the upper / mandibular posterior teeth, such as the second premolar to second molar position. When the bracket structure is inserted into the fixing tube, by rotating the fixing screw, one end of the fixing screw can contact and squeeze the bracket structure inserted into the fixing tube, thereby further fixing the direct structure and avoiding loosening after scanning and affecting positioning.

[0013] As an optional solution of the image-guided anchorage nail implantation positioning device and positioning method described in the present invention, the support structure includes a support body made of a flexible biocompatible material, which is used to fit the tooth surface, and the bottom of the support body is fixedly connected to a connecting portion for connecting to a fixing mechanism;

[0014] The surface of the bracket body is provided with a plurality of evenly distributed ray-identifiable marking points.

[0015] As an optional solution of the image-guided anchorage nail implantation positioning device and positioning method thereof described in the present invention, the stent body is arranged in a "cross" shape.

[0016] As an optional solution of the image-guided anchorage nail implantation positioning device and positioning method thereof described in the present invention, the marking points are lead points made of lead blocks, and the distance between two adjacent marking points is 1 mm.

[0017] As an optional solution of the image-guided anchorage nail implantation positioning device and positioning method thereof described in the present invention, the bracket body is customized by 3D printing to adapt to the patient's oral structure.

[0018] During CBCT scanning, complete three-dimensional image data including the tooth root and positioning dot array is obtained. Since the lead dots are small in size, the imaging is accurate, the marking dot array is free of artifact interference, the development is clear, and image navigation is convenient.

[0019] As an optional solution of the image-guided anchorage nail implantation positioning device and positioning method thereof described in the present invention, the following steps are included:

[0020] Step 1: Fix the fixing mechanism on the corresponding tooth surface, and fix the bracket structure inside the fixing mechanism, so that the bracket structure fits the patient's gums;

[0021] Step 2: Perform CBCT scanning to obtain complete three-dimensional image data including the tooth root and positioning dot array;

[0022] Step 3: Analyze the relative position of the markers in the image and the tooth root. The doctor analyzes the positional relationship between the metal markers in the image and the tooth root and bone plate to analyze the entry point and implantation path of the anchor pin.

[0023] Step 4: During the operation, precise anchorage pin implantation is performed based on the correspondence between the actual tooth surface and the marking points.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention achieves accurate spatial judgment of tooth roots and nail insertion points in CBCT images, greatly improving implant safety and accuracy;

[0026] Simple structure, quick installation, no cross interference during preoperative and intraoperative operations;

[0027] The marking dot matrix has no artifact interference, the imaging is clear, and it is convenient for image navigation;

[0028] It can be customized by 3D printing according to the patient's anatomical structure and has industrial feasibility;

[0029] The device is low-cost and can be redesigned for different clinical scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a schematic diagram of the overall structure of an image-guided anchorage nail implantation positioning device and its positioning method;

[0031] Figure 2 It is a structural schematic diagram of an image-guided anchorage nail implantation positioning device and its positioning method, a fixing mechanism, and a support structure;

[0032] Figure 3 This is a diagram showing the spatial relationship between the metal marker points of the positioning device and the tooth root in the CBCT image.

[0033] In the figure: 1. tooth; 2. fixing mechanism; 201. bonding part; 202. fixing cylinder; 203. fixing screw; 3. bracket structure; 301. connecting part; 302. bracket body; 303. marking point. DETAILED DESCRIPTION

[0034] Example 1: Please refer to Figure 1-3 , the present invention provides a technical solution:

[0035] An image-guided anchorage nail implantation positioning device and positioning method thereof, comprising a tooth 1, a fixing mechanism 2, and a support structure 3;

[0036] One side of the support structure 3 made of flexible biocompatible material is inserted into the interior of the fixing mechanism 2, and the fixing mechanism 2 is fixed to the surface of the tooth 1 by an adhesive.

[0037] The following steps are included:

[0038] Step 1: Fix the fixing mechanism 2 on the surface of the corresponding tooth 1, and fix the bracket structure 3 inside the fixing mechanism 2, so that the bracket structure 3 fits the patient's gums;

[0039] Step 2: Perform CBCT scanning to obtain complete three-dimensional image data including the tooth root and positioning dot array;

[0040] Step 3: Analyze the relative position of the markers in the image and the tooth root. The doctor analyzes the positional relationship between the metal markers in the image and the tooth root and bone plate to analyze the entry point and implantation path of the anchor pin.

[0041] Step 4: During the operation, precise anchorage pin implantation is performed based on the correspondence between the actual tooth surface and the marking points.

[0042] CBCT cone beam computed tomography is a three-dimensional imaging technology that can clearly show the tooth root and surrounding bone structure. In theory, it can be used for preoperative path planning. However, in actual application, the position of anchorage pin implantation is generally confirmed by using an L-shaped metal wire fixed to the tooth surface through a bracket or other structure. This positioning method has the following technical problems: First, the L-shaped metal wire is large in size and will produce artifacts during scanning imaging (such as Figure 3 ), it is impossible to accurately locate the implantation position of the anchorage nail. Secondly, due to the lack of stable and identifiable intraoral positioning reference points, CBCT images are difficult to correspond to actual oral operations, which limits its navigation role in clinical implantation. By cooperating with the set fixing mechanism 2 and the bracket structure 3, accurate spatial judgment of the tooth root and the nail entry point in the CBCT image can be achieved, greatly improving the safety and accuracy of implantation; and the structure is simple, the installation is quick, and there is no cross-interference in preoperative and intraoperative operations; the marking dot array has no artifact interference, the development is clear, and it is convenient for image navigation; it can be 3D printed and customized according to the patient's anatomical structure, and has industrial feasibility; the device has low cost and can be repeatedly designed for different clinical scenarios.

[0043] Example 2: This example is an improvement on Example 1. Figure 1 and Figure 2 Specifically, the fixing mechanism 2 includes a bonding portion 201 in close contact with the adhesive, and a laterally arranged fixing cylinder 202 is fixedly connected to the other side of the bonding portion 201, and a fixing screw 203 is also spirally connected to the surface of the fixing cylinder 202.

[0044] The fixing tube 202 is hollow.

[0045] The bonding portion 201 is arranged in a concave-convex shape on the side facing the tooth 1 , and is used to cooperate with the adhesive to stably bond to the surface of the tooth 1 .

[0046] When installing the fixing mechanism 2, it is recommended to place it in the buccal area of ​​the upper / mandibular posterior teeth, such as the second premolar to second molar position. When the support structure 3 is inserted into the fixing cylinder 202, by rotating the fixing screw 203, one end of the fixing screw 203 can contact and squeeze the support structure 3 inserted into the fixing cylinder 202, thereby further fixing the support structure 3 and preventing it from loosening after scanning and affecting positioning.

[0047] The side of the bonding portion 201 facing the tooth 1 is concave-convex for full contact with the adhesive to ensure bonding quality. The fixing tube 202 is hollow for easy insertion of the bracket mechanism 3 therein.

[0048] Example 3: This example is an improvement on Example 2. Figure 1 and Figure 2Specifically, the support structure 3 includes a support body 302 made of a flexible biocompatible material for fitting the tooth surface, and the bottom of the support body 302 is also fixedly connected to a connecting portion 301 for connecting to the fixing mechanism 2;

[0049] The surface of the bracket body 302 is provided with a plurality of evenly distributed ray-identifiable marking points 303 .

[0050] The bracket body 302 is arranged in a cross shape.

[0051] The marking points 303 are lead points made of lead blocks, and the distance between two adjacent marking points 303 is 1 mm.

[0052] The bracket body 302 is customized using 3D printing to fit the patient's oral structure.

[0053] During CBCT scanning, complete three-dimensional image data including tooth roots and positioning dot arrays are obtained. Due to the small size of the lead dots, the imaging is accurate, the marking dot array has no artifact interference, the imaging is clear, and image navigation is convenient;

[0054] The bracket body 302 is customized by 3D printing and manufactured according to the patient's actual oral condition to ensure the quality of subsequent scanning imaging. In addition, multiple marking points 303 can be made of imaging materials such as lead points or gold marks, which can be clearly visualized in CBCT without obvious artifacts, and are used to provide a spatial positioning coordinate reference. The implantation of the anchorage nail can be accurately positioned by the position of the lead points, and the distal or mesial position can be selected and targeted adjustments can be made according to the actual situation.

[0055] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method of the present invention and its core ideas. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. An image-guided anchorage nail implantation positioning device, characterized by: It comprises a tooth (1), a fixing mechanism (2) and a support structure (3); One side of a support structure (3) made of a flexible biocompatible material is inserted into the interior of the fixing mechanism (2), and the fixing mechanism (2) is fixed to the surface of the tooth (1) by means of an adhesive.

2. The image-guided anchorage nail implantation positioning device according to claim 1, characterized in that: The fixing mechanism (2) comprises a bonding portion (201) in close contact with the adhesive, the other side of the bonding portion (201) being fixedly connected to a transversely arranged fixing cylinder (202), and a fixing screw (203) being spirally connected to the surface of the fixing cylinder (202).

3. The image-guided anchorage nail implantation positioning device according to claim 2, characterized in that: The fixing cylinder (202) is hollow.

4. The image-guided anchorage nail implantation positioning device according to claim 2, characterized in that: The bonding portion (201) is arranged in a concave-convex shape on the side facing the tooth (1), and is used to cooperate with the adhesive to stably bond to the surface of the tooth (1).

5. The image-guided anchorage nail implantation positioning device according to claim 1, characterized in that: The support structure (3) includes a support body (302) made of a flexible biocompatible material, which is used to fit the tooth surface. The bottom of the support body (302) is also fixedly connected to a connecting portion (301) for connecting to the fixing mechanism (2); The surface of the bracket body (302) is provided with a plurality of evenly distributed ray-identifiable marking points (303).

6. The image-guided anchorage nail implantation positioning device according to claim 5, characterized in that: The support body (302) is arranged in a cross shape.

7. The image-guided anchorage nail implantation positioning device according to claim 5, characterized in that: The marking points (303) are lead points made of lead blocks, and the distance between two adjacent marking points (303) is 1 mm.

8. The image-guided anchorage nail implantation positioning device according to claim 5, characterized in that: The bracket body (302) is customized using 3D printing to fit the patient's oral structure.

9. The positioning method of the image-guided anchorage nail implantation positioning device according to claim 1, characterized in that: The following steps are included: Step 1: fix the fixing mechanism (2) on the surface of the corresponding tooth (1), and fix the bracket structure (3) inside the fixing mechanism (2), so that the bracket structure (3) fits the patient's gums; Step 2: Perform CBCT scanning to obtain complete three-dimensional image data including the tooth root and positioning dot array; Step 3: Analyze the relative position of the markers in the image and the tooth root. The doctor analyzes the positional relationship between the metal markers in the image and the tooth root and bone plate to analyze the entry point and implantation path of the anchor pin. Step 4: During the operation, precise anchorage pin implantation is performed based on the correspondence between the actual tooth surface and the marking points.

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