Personalized guide plate and positioning method for maxillofacial nerve three-dimensional navigation

Abstract

The application provides a personalized guide plate and positioning method for maxillofacial nerve three-dimensional navigation, which comprises a fixed part and a navigation part, the fixed part and the navigation part are designed by patient maxillofacial three-dimensional imaging data and 3D integrally printed; the navigation part is provided with a navigation positioning channel corresponding to the patient maxillofacial nerve. The fixed part and the navigation part are integrally printed based on the patient maxillofacial three-dimensional imaging data, so that the fixed part has high compatibility with the patient's maxillary / dental arch form, and the navigation part also has high compatibility with the patient's face, and the setting accuracy of the navigation positioning channel is also higher, so that when the fixed part is placed between the patient's maxillary dental arch and mandibular dental arch and occluded, compared with the conventional simple facial soft tissue fixation method, the navigation positioning channel on the navigation part of the application is more accurate and reliable.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a personalized guide plate and positioning method for three-dimensional navigation of the maxillofacial nerve. Background Technology

[0002] Clinical procedures in oral and maxillofacial surgery, such as nerve block anesthesia and radiofrequency ablation, often involve the localization of maxillofacial nerves. Accurate three-dimensional navigation using personalized guides is crucial for nerve anesthesia / radiofrequency ablation in oral and maxillofacial surgery.

[0003] Currently reported three-dimensional guides for maxillofacial nerve localization are mainly customized based on imaging data of the soft and hard tissues of the maxillofacial region. During use, they are simply fixed to soft tissues such as the external auditory canal, nose, and forehead skin. Because facial soft tissues have a certain degree of elasticity and deformation characteristics, conventional personalized maxillofacial nerve guides are prone to shifting in angle and direction during fixed-point manipulation, leading to problems such as inaccurate navigation and positioning. Summary of the Invention

[0004] To address the issue of inaccurate navigation and positioning of existing maxillofacial nerve guides due to the limitations of facial soft tissue characteristics, this application provides a personalized guide and positioning method for three-dimensional navigation of the maxillofacial nerve.

[0005] Firstly, this application provides a personalized guide for three-dimensional navigation of the maxillofacial nerves, employing the following technical solution:

[0006] A personalized guide plate for three-dimensional navigation of the maxillofacial nerve includes a fixation part and a navigation part, wherein the fixation part and the navigation part are designed and 3D printed in one piece based on the patient's three-dimensional maxillofacial imaging data;

[0007] The navigation unit is equipped with a navigation and positioning channel corresponding to the patient's maxillofacial nerve.

[0008] Furthermore, the fixing part is configured as an occlusal plate structure that conforms to the morphology of the patient's maxillary / mandibular dentition, and the navigation part extends naturally from the fixing part.

[0009] Furthermore, the navigation unit is also provided with auxiliary fixation points at the zygomatic bone and zygomatic arch, brow bone and brow arch, frontal bone, alveolar bone, mandibular ramus, and mandibular chin where there is less soft tissue on the face. The auxiliary fixation points and the fixation unit are combined to form a multi-point fixed fixation based on the two-point / three-point fixation principle.

[0010] Furthermore, when the fixation is based on the maxillary dentition, in surgeries involving extraoral access of the maxillary nerve via the foramen rotundum, extraoral access of the mandibular nerve via the foramen ovale, and extraoral access of the supraorbital / inferior orbital nerve via the supraorbital / inferior orbital foramen, the auxiliary fixation point corresponds to the patient's zygomatic arch and brow bone / brow arch.

[0011] In procedures involving the infraorbital nerve via the intraoral approach through the infraorbital foramen, the auxiliary fixation point corresponds to the patient's maxillary alveolar bone.

[0012] Furthermore, when the fixation is based on the mandibular dentition, in surgeries involving the intraoral approach to the inferior alveolar nerve via the mandibular foramen, the auxiliary fixation point corresponds to the ascending ramus of the patient's mandible;

[0013] In surgeries involving the extraoral approach to the mental nerve via the mental foramen, the auxiliary fixation points correspond to the chin of the patient's mandible;

[0014] In surgeries involving the mental nerve via the intraoral approach through the mental foramen, the auxiliary fixation point corresponds to the patient's mandibular alveolar bone.

[0015] Furthermore, the navigation unit is equipped with different navigation positioning channels corresponding to one or more maxillofacial nerves such as the maxillary nerve, mandibular nerve, inferior alveolar nerve, mental nerve, supraorbital nerve, and infraorbital nerve.

[0016] Furthermore, the navigation unit is equipped with multiple navigation and positioning channels at different angles for the same maxillofacial nerve.

[0017] Furthermore, the three-dimensional maxillofacial imaging data includes both soft and hard tissue data of the patient's maxillofacial region;

[0018] The soft tissue data includes the morphology of the patient's facial skin, upper and lower lips, gingival mucosa, buccal mucosa, and tongue;

[0019] The hard tissue data includes the morphology of the patient's maxillary / mandibular dentition, maxillary / mandibular bones, zygomatic bone and zygomatic arch, brow bone and brow arch, frontal bone, as well as the morphology and location of the foramen rotundum, foramen ovale, mandibular foramen, mental foramen, supraorbital foramen, and infraorbital foramen.

[0020] Secondly, this application provides a localization method for three-dimensional navigation of the maxillofacial nerve, based on the aforementioned personalized guide plate for three-dimensional navigation of the maxillofacial nerve, comprising the following steps:

[0021] S1. Design and print the fixation unit and the navigation unit based on the patient's maxillofacial three-dimensional imaging data, and perform sterilization operations on the fixation unit and the navigation unit, as well as disinfection operations on the patient's face and oral cavity;

[0022] S2. The navigation unit is placed against the patient's face, and the patient bites the fixing unit between the maxillary and mandibular dentition to fix the fixing unit;

[0023] S3. Based on the patient's maxillofacial three-dimensional imaging data, set the needle insertion depth for nerve anesthesia / radiofrequency treatment, insert the anesthesia injector / radiofrequency needle into the navigation and positioning channel at the set needle insertion depth, and perform subsequent nerve injection anesthesia / radiofrequency treatment operations;

[0024] S4. After the operation is completed, gradually withdraw the anesthesia syringe / radiofrequency needle from the navigation and positioning channel, remove the fixation part and the navigation part, and press the needle insertion point on the patient's face with a sterile cotton ball for 5-10 minutes.

[0025] Furthermore, in addition to fixing based on the maxillary / mandibular dentition, the fixation unit also performs multi-point fixation based on the two-point / three-point fixation principle at the zygomatic bone and zygomatic arch, brow bone and brow arch, frontal bone and alveolar bone where there is less soft tissue in the face, in order to solve the situation where the fixation effect is poor when the distal end of the navigation unit is far from the fixation unit.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. By printing and manufacturing the fixation and navigation parts in an integrated manner based on the patient's three-dimensional maxillofacial imaging data, the fixation part has a high degree of conformity with the patient's maxillary / mandibular dentition morphology, and the navigation part also has a high degree of conformity with the patient's face. The setting accuracy of the navigation positioning channel is also higher. Therefore, when the fixation part is placed between the patient's maxillary and mandibular dentition and occluded, compared with the conventional simple facial soft tissue fixation method, the navigation positioning channel on the navigation part of this application is more accurate and reliable in positioning.

[0028] 2. By setting up multiple navigation and positioning channels on the navigation unit, including multiple maxillofacial nerves such as the maxillary nerve, mandibular nerve, inferior alveolar nerve, mental nerve, supraorbital nerve, and infraorbital nerve, and with different navigation angles, clinicians have more choices and the system is more practical.

[0029] 3. By setting corresponding auxiliary fixation points on the navigation plate in different surgeries and fitting them to the corresponding hard tissues of the patient's face, the guide plate composed of the fixation part and the navigation part can be fixed at multiple points. This can further solve the problem of poor overall fixation effect caused by the distance between the distal end of the navigation part and the fixation part. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1This is a schematic diagram of the navigation and positioning guide plate for the extraoral maxillary nerve method via the circular orifice according to an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the navigation and positioning guide plate for the extraoral mandibular nerve transforamina oval method according to an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the navigation and positioning guide plate for the intraoral method of inferior alveolar nerve via the mandibular foramen according to an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the navigation and positioning guide plate for the extraoral mental nerve method via the mental foramen according to an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the navigation and positioning guide plate for the intraoral method of the mental nerve via the mental foramen according to an embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the navigation and positioning guide plate for the supraorbital / inferior orbital nerve extraoral method via the supraorbital / inferior orbital foramen according to an embodiment of this application;

[0037] Figure 7 This is a schematic diagram of the navigation and positioning guide plate for the intraoral method of the infraorbital nerve via the infraorbital foramen, according to an embodiment of this application.

[0038] Figure label:

[0039] 1. Fixing part;

[0040] 2. Navigation Department; 21. Navigation and Positioning Channel. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0042] Example 1:

[0043] Reference Figure 1 and Figure 2 This application discloses a personalized guide plate for three-dimensional navigation of the maxillofacial nerve, which includes a fixation part 1 and a navigation part 2. The fixation part 1 and the navigation part 2 are designed and 3D printed from the patient's maxillofacial three-dimensional imaging data.

[0044] The navigation unit 2 is equipped with a navigation positioning channel 21 corresponding to the patient's maxillofacial nerve.

[0045] The fixing part 1 is configured as an occlusal plate structure that conforms to the morphology of the patient's maxillary / mandibular dentition, and the navigation part 2 extends naturally from the fixing part 1.

[0046] Furthermore, the three-dimensional imaging data of the maxillofacial region includes both soft and hard tissue data of the patient's maxillofacial region;

[0047] Soft tissue data includes the morphology of the patient's facial skin, upper and lower lips, gingival mucosa, buccal mucosa, and tongue;

[0048] Hard tissue data include the morphology of the patient's maxillary / mandibular dentition, maxilla / mandible, zygomatic bone and zygomatic arch, brow bone and brow arch, frontal bone, as well as the morphology and location of the foramen rotundum, foramen ovale, mandibular foramen, mental foramen, supraorbital foramen, and infraorbital foramen.

[0049] Therefore, by printing the fixation part 1 and navigation part 2 in an integrated manner based on the patient's three-dimensional maxillofacial imaging data, the fixation part 1 has a high degree of conformity with the patient's maxillary / mandibular dentition morphology, and the navigation part 2 also has a high degree of conformity with the patient's face. The setting accuracy of the navigation positioning channel 21 is also higher. Thus, when the fixation part 1 is placed between the patient's maxillary and mandibular dentition and occluded, compared with the conventional simple facial soft tissue fixation method, the positioning of the navigation positioning channel 21 on the navigation part 2 of this application is more accurate and reliable.

[0050] In addition, to further enhance the diversity of procedures performed.

[0051] In one embodiment, the navigation unit 2 is provided with different navigation positioning channels 21 corresponding to one or more maxillofacial nerves such as the maxillary nerve, mandibular nerve, inferior alveolar nerve, mental nerve, supraorbital nerve, and infraorbital nerve.

[0052] In another embodiment, refer to Figure 1 and Figure 2 The navigation unit 2 is equipped with multiple navigation and positioning channels 21 at different angles for the same maxillofacial nerve.

[0053] In this way, by setting up multiple navigation positioning channels 21 on the navigation unit 2, including multiple maxillofacial nerves such as the maxillary nerve, mandibular nerve, inferior alveolar nerve, mental nerve, supraorbital nerve, and infraorbital nerve, and with different navigation angles, clinicians have more choices and the system is more practical.

[0054] Furthermore, in order to further improve the fixing stability of the guide plate of this application.

[0055] The navigation unit 2 is also equipped with auxiliary fixation points at the zygomatic bone and zygomatic arch, brow bone and brow arch, frontal bone, alveolar bone, mandibular ramus, and mandibular chin where there is less soft tissue on the face. The auxiliary fixation points are combined with the fixation unit 1 to form a multi-point fixation based on the two-point / three-point fixation principle.

[0056] Specifically, when the fixation unit 1 is based on the maxillary dentition, in surgeries involving the extraoral method of the maxillary nerve through the foramen rotundum, the extraoral method of the mandibular nerve through the foramen ovale, and the extraoral method of the supraorbital / inferior orbital nerve through the supraorbital / inferior orbital foramen, the auxiliary fixation points correspond to the zygomatic arch of the patient's zygomatic bone and the brow bone and brow arch.

[0057] In intraoral procedures involving the infraorbital nerve via the infraorbital foramen, the auxiliary fixation points correspond to the patient's maxillary alveolar bone.

[0058] When the fixation unit 1 is based on the mandibular dentition, in surgeries involving the intraoral approach to the mandibular foramen involving the inferior alveolar nerve, the auxiliary fixation point corresponds to the ascending ramus of the patient's mandible;

[0059] In surgeries involving the mental nerve via the extraoral approach through the mental foramen, the auxiliary fixation points correspond to the chin of the patient's mandible;

[0060] In intraoral transmental procedures involving the mental nerve, the auxiliary fixation point corresponds to the patient's mandibular alveolar bone.

[0061] Therefore, by setting corresponding auxiliary fixation points on the navigation plate and fitting them to the corresponding hard tissues of the patient's face during different surgeries, the guide plate composed of fixation part 1 and navigation part 2 can be fixed at multiple points, which can further solve the problem of poor overall fixation effect caused by the distance between the distal end of navigation part 2 and fixation part 1.

[0062] This application also discloses a positioning method for three-dimensional navigation of the maxillofacial nerve, based on the aforementioned personalized guide plate for three-dimensional navigation of the maxillofacial nerve, and employing the following technical solution:

[0063] A localization method for three-dimensional navigation of the maxillofacial nerve includes the following steps:

[0064] S1. Design and print the fixation unit 1 and navigation unit 2 based on the patient's three-dimensional maxillofacial imaging data, and perform sterilization operations on the fixation unit 1 and navigation unit 2 as well as disinfection operations on the patient's face and oral cavity;

[0065] S2. Place the navigation part 2 against the patient's face and have the patient bite down on the fixation part 1 between the maxillary and mandibular dentition to fix the fixation part 1;

[0066] S3. Set the needle depth for nerve anesthesia / radiofrequency treatment based on the patient's maxillofacial three-dimensional imaging data, insert the anesthesia syringe / radiofrequency needle into the navigation positioning channel 21 at the set needle depth, and perform subsequent nerve injection anesthesia / radiofrequency treatment operations.

[0067] S4. After the operation is completed, gradually withdraw the anesthesia syringe / radiofrequency needle from the navigation and positioning channel 21, remove the fixation part 1 and the navigation part 2, and press the needle insertion point on the patient's face with a sterile cotton ball for 5-10 minutes.

[0068] In step S2, in addition to fixing based on the maxillary / mandibular dentition, the fixing part 1 also performs multi-point fixation based on the two-point / three-point fixation principle at the zygomatic arch, brow bone, frontal bone, and alveolar bone where there is less soft tissue in the face, in order to solve the problem that the fixation effect is not good when the distance between the distal end of the navigation part 2 and the fixing part 1 is too far.

[0069] The implementation principle of a personalized guide plate for three-dimensional navigation of the maxillofacial nerve in this application embodiment is as follows:

[0070] By integrating and printing the fixation part 1 and navigation part 2 based on the patient's maxillofacial three-dimensional imaging data, the fixation part 1 has a high degree of conformity with the patient's maxillary / mandibular dentition morphology, and the navigation part 2 also has a high degree of conformity with the patient's face. The setting accuracy of the navigation positioning channel 21 is also higher. Therefore, when the fixation part 1 is placed between the patient's maxillary and mandibular dentition and occluded, compared with the conventional simple facial soft tissue fixation method, the positioning of the navigation positioning channel 21 on the navigation part 2 of this application is more accurate and reliable.

[0071] By setting up multiple navigation positioning channels 21 on the navigation unit 2, including multiple maxillofacial nerves such as the maxillary nerve, mandibular nerve, inferior alveolar nerve, mental nerve, supraorbital nerve, and infraorbital nerve, and with different navigation angles, clinicians have more choices and the system is more practical.

[0072] By setting corresponding auxiliary fixation points on the navigation plate in different surgeries and fitting them to the corresponding hard tissues of the patient's face, the guide plate composed of fixation part 1 and navigation part 2 can be fixed at multiple points. This can further solve the problem of poor overall fixation effect caused by the distance between the distal end of navigation part 2 and fixation part 1.

[0073] Example 2:

[0074] This application discloses a positioning method for three-dimensional navigation of the maxillofacial nerve, mainly targeting the needs of maxillary nerve anesthesia / radiofrequency treatment.

[0075] Specifically, a navigation and positioning guide for the maxillary nerve via the foramen rotundum via extraoral route is designed and printed based on the patient's three-dimensional maxillofacial imaging data, such as... Figure 1 As shown, a navigation and positioning channel 21 is provided that extends from the sigmoid notch to the round hole, or from the zygomatic bone to the round hole, or a navigation and positioning channel 21 is provided in two directions.

[0076] Then, the navigation positioning guide is sterilized, and the patient's face and mouth are disinfected. The navigation positioning guide is then fixed based on the patient's maxillary dentition, zygomatic arch, and brow bone / brow arch using a three-point fixation principle. The distance from the surface of the navigation positioning channel 21 to the circular hole is calculated based on the patient's three-dimensional maxillofacial imaging data, and the needle insertion depth for nerve anesthesia / radiofrequency treatment is set. The anesthesia syringe / radiofrequency needle is inserted into the navigation positioning channel 21 outside the mouth, passing through the skin to the set depth to reach the circular hole. Subsequent nerve injection anesthesia / radiofrequency treatment is then performed. After the procedure, the anesthesia syringe / radiofrequency needle is gradually withdrawn from the navigation positioning channel 21, and the navigation positioning guide is removed. A sterile cotton ball is applied to the insertion point for 5-10 minutes.

[0077] Example 3:

[0078] This application discloses a positioning method for three-dimensional navigation of the maxillofacial nerve, mainly targeting the needs of mandibular nerve anesthesia / radiofrequency treatment. First, a navigation positioning guide for the mandibular nerve via the extraoral method through the foramen ovale is designed and printed based on the patient's three-dimensional maxillofacial imaging data. Figure 2 As shown, a navigation and positioning channel 21 is set from the sigmoid notch to the foramen ovale, or from the zygomatic bone to the foramen ovale, or both directions of navigation and positioning channels 21 are set simultaneously.

[0079] Then, the navigation positioning guide is sterilized, and the patient's face and mouth are disinfected. The navigation positioning guide is then fixed based on the patient's maxillary dentition, zygomatic arch, and brow bone / brow arch using a three-point fixation principle. The needle insertion depth for nerve anesthesia / radiofrequency treatment is set based on the distance from the navigation channel surface to the foramen ovale calculated from imaging data. The anesthesia syringe / radiofrequency needle is inserted into the navigation positioning channel 21 outside the mouth, passing through the skin to the set depth to reach the foramen ovale. Subsequent nerve injection anesthesia / radiofrequency treatment is then performed. After the procedure, the anesthesia syringe / radiofrequency needle is gradually withdrawn from the navigation positioning channel 21, and the navigation positioning guide is removed. A sterile cotton ball is applied to the insertion point for 5-10 minutes.

[0080] Example 4:

[0081] This application discloses a positioning method for three-dimensional navigation of the maxillofacial nerve, mainly targeting the needs of anesthesia / radiofrequency treatment of the inferior alveolar nerve. First, a navigation positioning guide for the inferior alveolar nerve via the mandibular foramen is designed and printed based on the patient's three-dimensional maxillofacial imaging data. Figure 3 As shown, a navigation and positioning channel 21 is set from the opposite corner of the mouth to the mandibular foramen.

[0082] Then, the navigation positioning guide is sterilized, and the patient's face and oral cavity are disinfected. The navigation positioning guide is then positioned and fixed based on the patient's mandibular dentition and mandibular ramus. The needle insertion depth for nerve anesthesia / radiofrequency ablation is set based on the distance from the navigation channel surface to the mandibular foramen calculated from imaging data. With the patient's mouth open, the anesthesia syringe / radiofrequency needle is inserted into the navigation positioning channel 21 along its entrance, passing through the buccal mucosa to the set depth to reach the mandibular foramen. Subsequent nerve injection anesthesia / radiofrequency ablation is then performed. After the procedure, the anesthesia syringe / radiofrequency needle is gradually withdrawn from the navigation positioning channel 21, and the navigation positioning guide is removed. A sterile cotton ball is applied to the insertion point for 5-10 minutes.

[0083] Example 5:

[0084] This application discloses a positioning method for three-dimensional navigation of the maxillofacial nerve, mainly targeting the needs of mental nerve anesthesia / radiofrequency ablation. First, a navigation and positioning guide for the mental nerve via the mental foramen is designed and printed based on the patient's three-dimensional maxillofacial imaging data. Figure 4 As shown, a navigation and positioning channel 21 is provided from the front side, through the lower lip, to the chin hole.

[0085] Then, the navigation positioning guide is sterilized, and the patient's face and mouth are disinfected. The navigation positioning guide is then positioned and fixed based on the patient's mandibular dentition and chin. The needle insertion depth for nerve anesthesia / radiofrequency ablation is set based on the distance from the navigation channel surface to the mental foramen calculated from imaging data. The anesthesia syringe / radiofrequency needle is inserted into the navigation positioning channel 21 outside the mouth, passing through the lower lip soft tissue to the set depth to reach the mental foramen. Subsequent nerve injection anesthesia / radiofrequency ablation is then performed. After the procedure, the anesthesia syringe / radiofrequency needle is gradually withdrawn from the navigation positioning channel 21, and the navigation positioning guide is removed. A sterile cotton ball is applied to the insertion point for 5-10 minutes.

[0086] Example 6:

[0087] This application discloses a positioning method for three-dimensional navigation of the maxillofacial nerve, mainly targeting the needs of mental nerve anesthesia / radiofrequency ablation. First, a navigation and positioning guide for the mental nerve via the mental foramen is designed and printed based on the patient's three-dimensional maxillofacial imaging data. Figure 5 As shown, a navigation and positioning channel 21 is provided from the front side without passing through the lower lip to the chin hole.

[0088] Then, the navigation positioning guide is sterilized and the patient's face is disinfected. The navigation positioning guide is then positioned and fixed based on the patient's mandibular dentition and alveolar bone. The needle insertion depth for nerve anesthesia / radiofrequency treatment is set based on the distance from the navigation channel surface to the mental foramen calculated from imaging data. The soft tissue of the patient's lower lip is opened, and then the anesthesia syringe / radiofrequency needle is inserted into the navigation positioning channel 21 through the gingival mucosa to the set depth, reaching the mental foramen. Subsequent nerve injection anesthesia / radiofrequency treatment is then performed. After the procedure, the anesthesia syringe / radiofrequency needle is gradually withdrawn from the navigation positioning channel 21, and the navigation positioning guide is removed. A sterile cotton ball is applied to the insertion point for 5-10 minutes.

[0089] Example 7:

[0090] This application discloses a positioning method for three-dimensional navigation of the maxillofacial nerves, mainly targeting the needs of supraorbital / inferior nerve anesthesia / radiofrequency ablation. First, a navigation positioning guide for the supraorbital / inferior nerve via the supraorbital / inferior foramen is designed and printed based on the patient's maxillofacial three-dimensional imaging data. Figure 6 As shown, a navigation and positioning channel 21 is provided that extends from the front to the supraorbital foramen, and another navigation and positioning channel 21 extends from the anterior medial inferior to the infraorbital foramen.

[0091] Then, the navigation positioning guide is sterilized, and the patient's face and mouth are disinfected. The navigation positioning guide is then fixed based on the patient's maxillary dentition, zygomatic bone and zygomatic arch, and brow bone and brow arch using a three-point fixation principle. The needle insertion depth for nerve anesthesia / radiofrequency ablation is set based on the distance from the navigation channel surface to the supraorbital / inferior foramen calculated from imaging data. The anesthesia syringe / radiofrequency needle is inserted into the navigation positioning channel 21 through the entrance, passing through the periorbital skin to the set needle insertion depth to reach the supraorbital / inferior foramen. Subsequent nerve injection anesthesia / radiofrequency ablation is then performed. After the procedure, the anesthesia syringe / radiofrequency needle is gradually withdrawn from the navigation positioning channel 21, and the navigation positioning guide is removed. A sterile cotton ball is applied to the needle insertion point for 5-10 minutes.

[0092] Example 8:

[0093] This application discloses a positioning method for three-dimensional navigation of the maxillofacial nerve, mainly targeting the needs of infraorbital nerve anesthesia / radiofrequency ablation. First, a navigation positioning guide for the infraorbital nerve via the infraorbital foramen is designed and printed based on the patient's three-dimensional maxillofacial imaging data. Figure 7 As shown, a navigation and positioning channel 21 is provided, extending from the anteromedial inferior part of the mouth to the infraorbital foramen.

[0094] Then, the navigation positioning guide is sterilized, and the patient's face and oral cavity are disinfected. The navigation positioning guide is then fixed based on the patient's maxillary dentition and maxillary alveolar bone. The needle insertion depth for nerve anesthesia / radiofrequency treatment is set according to the distance from the surface of the navigation channel to the infraorbital foramen calculated from the imaging data. After the patient's upper lip is opened, the anesthesia syringe / radiofrequency needle is inserted into the navigation positioning channel 21 along the entrance of the navigation positioning channel 21 inside the mouth, passing through the gingival mucosa to the set needle insertion depth to reach the infraorbital foramen. Subsequent nerve injection anesthesia / radiofrequency treatment is then performed. After the operation is completed, the anesthesia syringe / radiofrequency needle is gradually withdrawn from the navigation positioning channel 21, and the navigation positioning guide is removed. A sterile cotton ball is pressed on the needle insertion point for 5-10 minutes.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A personalized guide plate for three-dimensional navigation of the maxillofacial nerve, characterized in that, It includes a fixation unit and a navigation unit, which are designed and 3D printed in one piece based on the patient's maxillofacial three-dimensional imaging data; The navigation unit is equipped with a navigation positioning channel corresponding to the patient's maxillofacial nerve. The navigation unit is also provided with auxiliary fixation points at the zygomatic bone and zygomatic arch, brow bone and brow arch, frontal bone, alveolar bone, mandibular ramus, and mandibular chin where there is less soft tissue on the face. The auxiliary fixation points and the fixation unit are combined to form a multi-point fixed fixation based on the two-point / three-point fixation principle. The three-dimensional imaging data of the maxillofacial region includes soft tissue data and hard tissue data of the patient's maxillofacial region; The soft tissue data includes the morphology of the patient's facial skin, upper and lower lips, gingival mucosa, buccal mucosa, and tongue; The hard tissue data includes the morphology of the patient's maxillary / mandibular dentition, maxillary / mandibular bones, zygomatic bone and zygomatic arch, brow bone and brow arch, frontal bone, as well as the morphology and location of the foramen rotundum, foramen ovale, mandibular foramen, mental foramen, supraorbital foramen, and infraorbital foramen. The fixing part is configured as an occlusal plate structure that conforms to the morphology of the patient's maxillary / mandibular dentition, and the navigation part extends naturally from the fixing part; The navigation unit is equipped with multiple navigation and positioning channels at different angles for the same maxillofacial nerve.

2. The personalized guide plate for three-dimensional navigation of the maxillofacial nerve according to claim 1, characterized in that, When the fixation is based on the maxillary dentition, in surgeries involving extraoral access of the maxillary nerve via the foramen rotundum, extraoral access of the mandibular nerve via the foramen ovale, and extraoral access of the supraorbital / inferior orbital nerve via the supraorbital / inferior orbital foramen, the auxiliary fixation points correspond to the patient's zygomatic arch and brow bone / brow arch. In procedures involving the infraorbital nerve via the intraoral approach through the infraorbital foramen, the auxiliary fixation point corresponds to the patient's maxillary alveolar bone.

3. The personalized guide plate for three-dimensional navigation of the maxillofacial nerve according to claim 1, characterized in that, When the fixation is based on the mandibular dentition, in surgeries involving the intraoral approach to the mandibular foramen involving the inferior alveolar nerve, the auxiliary fixation point corresponds to the ascending ramus of the patient's mandible; In surgeries involving the extraoral approach to the mental nerve via the mental foramen, the auxiliary fixation points correspond to the chin of the patient's mandible; In surgeries involving the mental nerve via the intraoral approach through the mental foramen, the auxiliary fixation point corresponds to the patient's mandibular alveolar bone.

4. The personalized guide plate for three-dimensional navigation of the maxillofacial nerve according to claim 1, characterized in that, The navigation unit is equipped with different navigation positioning channels corresponding to one or more maxillofacial nerves among the patient's maxillary nerve, mandibular nerve, inferior alveolar nerve, mental nerve, supraorbital nerve, and infraorbital nerve.

5. A localization method for three-dimensional navigation of the maxillofacial nerve, based on a personalized guide for three-dimensional navigation of the maxillofacial nerve as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Design and print the fixation unit and the navigation unit based on the patient's maxillofacial three-dimensional imaging data, and perform sterilization operation; S2. The navigation unit is placed against the patient's face, and the patient bites the fixing unit between the maxillary and mandibular dentition to fix the fixing unit; S3. Neural positioning is achieved using the navigation positioning channel on the navigation unit; S4. After the operation is completed, remove the instrument and the personalized guide plate.

6. The localization method for three-dimensional navigation of the maxillofacial nerve according to claim 5, characterized in that, In step S2, in addition to fixing based on the maxillary / mandibular dentition, the fixing part also sets auxiliary fixing points based on the two-point / three-point fixing principle at the zygomatic arch, brow bone, frontal bone, and alveolar bone where there is less soft tissue in the face, in order to solve the situation where the fixing effect is poor due to the distance between the distal end of the navigation part and the fixing part.

Images