Positioning guide plate for mandible defect reconstruction surgery

Abstract

The utility model relates to the technical field of medical equipment, and discloses a positioning guide plate for a mandible defect reconstruction operation, which comprises a mandible reconstruction guide plate, an occlusion guide plate and a connecting rod, the lower jaw reconstruction guide plate comprises a repair section matched with a transplanted bone in a defective lower jaw bone area, a first fixing section and a second fixing section, the first fixing section and the second fixing section are connected to the two ends of the repair section respectively, the first fixing section extends to cover the rear edge of a lower jaw ramus, and a positioning groove matched with teeth in an occlusion mode is formed in the occlusion guide plate. The upper end of the connecting rod is detachably connected with the occlusion guide plate, and the lower end of the connecting rod is detachably connected with the lower jaw reconstruction guide plate. The occlusal guide plate and the mandibular reconstruction guide plate are connected through the connecting rod, accurate positioning is guaranteed, the risk that the connecting rod is broken is avoided, and accurate and synchronous reduction and reconstruction of the occlusal relation, the mandibular appearance and the condylar process position in an operation can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a positioning guide plate used in mandibular defect reconstruction surgery. Background Art

[0002] Various diseases occurring in the oral and maxillofacial region, such as oral cancer involving the mandible, osteoradionecrosis of the mandible, drug-related osteonecrosis of the mandible, and giant ameloblastoma of the mandible, require segmental resection of the mandible to ensure the complete removal of the expanded lesion during surgery. At present, vascularized free bone flaps, including free fibula flaps and free iliac flaps, are still the most commonly used methods to repair and reconstruct defects after segmental resection of the mandible. The main goal of mandibular reconstruction is to obtain satisfactory morphology and function. Studies have shown that changes in the position of the posterior condyle of the mandibular bone after reconstruction of the defect with free bone flaps will eventually lead to dysfunction of the temporomandibular joint and cause varying degrees of disorder in the occlusal relationship. Inaccurate restoration of the occlusal relationship during surgery will in turn affect the position and function of the condyle. Therefore, in addition to obtaining the precise size, length, and contour of the free bone flap used, this type of surgery also requires accurate intraoperative placement of the free bone flap, the position of the remaining condyle on the affected side, and the occlusal relationship of the remaining teeth.

[0003] The traditional intraoperative positioning guide mainly focuses on the symmetry of the mandibular contour on the affected side after bone flap transplantation. The positioning of the remaining condyle on the affected side cannot be correlated with the occlusal relationship, that is, the consistency of the occlusal relationship, condylar position and jaw morphology cannot be achieved, which can easily cause inaccurate occlusal relationship and / or condylar position deviation in patients after surgery. Utility Model Content

[0004] The utility model aims to provide a positioning guide plate for mandibular defect reconstruction surgery, which ensures accurate positioning and avoids the risk of connecting rod breakage, and can ensure accurate and synchronous reduction and reconstruction of occlusal relationship, mandibular shape and condylar position during surgery.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a positioning guide for mandibular defect reconstruction surgery, including a mandibular reconstruction guide, an occlusal guide and a connecting rod, the inner side of the mandibular reconstruction guide is in contact with the bone surface of the outer edge of the mandible, the mandibular reconstruction guide includes a repair section that cooperates with the transplanted bone in the defective mandibular area and a first fixed section and a second fixed section respectively connected to the two ends of the repair section, the first fixed section extends to cover the posterior edge of the mandibular ascending ramus, the occlusal guide is provided with a positioning groove that cooperates with the tooth occlusion, the upper end of the connecting rod is detachably connected to the occlusal guide, and the lower end of the connecting rod is detachably connected to the mandibular reconstruction guide.

[0006] As a preferred solution of the utility model, the front end face of the occlusal guide plate is provided with a first connecting protrusion, the front end face of the second fixing section is provided with a second connecting protrusion, the upper end of the connecting rod is provided with a first connecting groove that is buckled with the first connecting protrusion, and the lower end of the connecting rod is provided with a second connecting groove that is buckled with the second connecting protrusion.

[0007] As a preferred solution of the present invention, the second fixing section extends to cover the mandibular bone at least at three tooth positions on the healthy side.

[0008] As a preferred solution of the present invention, the second connecting protrusion is located at the mandible at the first tooth position on the healthy side of the repair section in the second fixing section.

[0009] As a preferred solution of the present invention, the repair segment covers at least one half of the area of ​​the transplanted bone in the defective mandibular region.

[0010] As a preferred solution of the utility model, the upper surface and the lower surface of the occlusal guide are both provided with positioning grooves whose shapes match the maxillary dentition and the mandibular dentition on the healthy side.

[0011] As a preferred solution of the present invention, both the first fixing section and the second fixing section are provided with fixing nail holes.

[0012] As a preferred solution of the present utility model, the mandibular reconstruction guide, the occlusal guide and the connecting rod are all formed by 3D printing.

[0013] As a preferred solution of the present utility model, the thickness of the mandibular reconstruction guide plate is 2.9 mm to 3.1 mm.

[0014] As a preferred solution of the present invention, the thickness of the occlusal guide plate is 3 mm to 5 mm.

[0015] Compared with the prior art, the positioning guide plate for mandibular defect reconstruction surgery in the embodiment of the utility model has the following beneficial effects:

[0016] The utility model can accurately locate the position of the condyle at the same time by extending the first fixing section to cover and fix the posterior edge of the mandibular ascending ramus, and the occlusal guide can restore the occlusal relationship of the patient's remaining dentition, and the connecting rod can detachably connect the occlusal guide and the mandibular reconstruction guide, and after the mandibular reconstruction guide and the occlusal guide are accurately positioned respectively, the mandibular reconstruction guide and the occlusal guide can be connected by using the connecting rod, thereby realizing the integrated positioning of the occlusion, the jaw morphology and the condyle position, avoiding the situation that the connecting rod breaks during the use and positioning of the integrated molding structure, ensuring that the positioning guide can stably fit the mandible, thereby ensuring the accurate reduction and reconstruction of the occlusal relationship, the mandibular shape and the condyle position during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings of the embodiment will be briefly introduced below.

[0018] Figure 1 This is a front view of a positioning guide plate for mandibular defect reconstruction surgery provided by the utility model;

[0019] Figure 2 It is a top view of a positioning guide plate for mandibular defect reconstruction surgery provided by the utility model;

[0020] Figure 3 It is a side view of a positioning guide plate for mandibular defect reconstruction surgery provided by the utility model;

[0021] Figure 4 It is a structural schematic diagram of the mandibular reconstruction guide plate and the occlusal guide plate provided by the utility model;

[0022] In the figure, the mandibular reconstruction guide plate 1; the repair section 11; the first fixing section 12; the second fixing section 13; the second connecting protrusion 14; the fixing nail hole 15; the occlusal guide plate 2; the first connecting protrusion 21; the positioning groove 22; the connecting rod 3; and the mandibular reconstruction plate 4. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0025] like Figure 1 to Figure 4As shown, a positioning guide for mandibular defect reconstruction surgery according to a preferred embodiment of the utility model comprises a mandibular reconstruction guide 1, an occlusal guide 2 and a connecting rod 3, wherein the inner side of the mandibular reconstruction guide 1 is in contact with the outer edge bone surface of the mandibular bone, and the mandibular reconstruction guide 1 comprises a repair segment 11 that cooperates with the transplanted bone in the defective mandibular bone area, and a first fixing segment 12 and a first fixing segment 12 that are respectively connected to both ends of the repair segment 11, wherein the first fixing segment 12 extends to cover the mandibular ascending ramus. The posterior edge of the condylar neck of the patient's affected side is formed so that the first fixing section 12 is individually matched with the bone surface of the posterior edge of the condylar neck of the patient. The first fixing section 12 of the mandibular reconstruction guide 1 is the distal section of the mandibular reconstruction guide 1, and the second fixing section 13 of the mandibular reconstruction guide 1 is the proximal section of the mandibular reconstruction guide 1. The occlusal guide 2 is provided with a positioning groove 22 that cooperates with the tooth occlusion. The upper end of the connecting rod 3 is detachably connected to the occlusal guide 2, and the lower end of the connecting rod 3 is detachably connected to the mandibular reconstruction guide 1. Specifically, the CT data of the patient's mandibular and bone tissue flap donor area are obtained before the operation, the patient's mandibular and bone tissue flap are measured respectively, the upper and lower jaw dentition scanning data are integrated with the upper and lower jaw CT data, the bony structure data of the mandibular and bone flap are obtained, and the mandibular reconstruction guide 1, the occlusal guide 2 and the connecting rod 3 are designed using Mimics 20.0 software.

[0026] The utility model extends the first fixing section 12 to cover and fix the posterior edge of the mandibular ramus, can accurately locate the position of the condyle at the same time, and the occlusal guide 2 can restore the occlusal relationship of the patient's remaining dentition, the connecting rod 3 can detachably connect the occlusal guide 2 and the mandibular reconstruction guide 1, can accurately position the mandibular reconstruction guide 1 and the occlusal guide 2 respectively, and then use the connecting rod 3 to connect the mandibular reconstruction guide 1 and the occlusal guide 2, so as to realize the integrated positioning of the occlusion, jaw morphology and condyle position, avoid the connection rod 3 from breaking during the use and positioning of the integrated molding structure, ensure that the positioning guide can stably fit the mandible, thereby ensuring the accurate reduction and reconstruction of the occlusal relationship, mandibular shape and condyle position during the operation.

[0027] Specifically, Figure 2-3 As shown, Figure 2-3 There is no prepared patient bone tissue flap (transplanted bone), the front end face of the occlusal guide 2 is provided with a first connecting protrusion 21, the front end face of the second fixing section 13 is provided with a second connecting protrusion 14, the upper end of the connecting rod 3 is provided with a first connecting groove that is buckled with the first connecting protrusion 21, the lower end of the connecting rod 3 is provided with a second connecting groove that is buckled with the second connecting protrusion 14, the connecting groove and the connecting protrusion are tightly and accurately connected and have a certain retaining friction force, so that the connecting rod 3 is accurately connected and fixed to the occlusal guide 2 and the second fixing section 13 respectively, and the occlusal guide 2 and the second fixing section 13 of the mandibular reconstruction guide 1 have a common positioning path to ensure accurate reduction and reconstruction.

[0028] Exemplarily, the second fixing section 13 extends to cover at least three tooth positions of the healthy side of the mandible, and the second fixing section 13 surrounds at least one-half of the lower edge of the mandible, effectively fitting with the remaining bone surface of the lower edge of the mandible on the healthy side of the patient. The second fixing section 13 is more stably and reliably connected to the mandible, ensuring accurate reduction and reconstruction of the mandibular shape during surgery.

[0029] Exemplarily, the second connecting protrusion 14 is located at the mandible at the first tooth position on the healthy side of the second fixing section 13 adjacent to the repair section 11 , so as to improve the connection stability between the connecting rod 3 and the second fixing section 13 of the mandibular reconstruction guide plate 1 .

[0030] Specifically, the repair segment 11 covers at least one-half of the area of ​​the transplanted bone in the defective mandibular region, and the repair segment 11 is individually matched with the prepared patient bone tissue flap (transplanted bone) to restore the bone surface of the lower edge of the mandibular bone.

[0031] Exemplarily, the upper and lower surfaces of the occlusal guide 2 are provided with positioning grooves 22 whose shapes match the remaining healthy maxillary dentition and the remaining healthy mandibular dentition, and the thickness of the occlusal guide 2 is 3mm to 5mm, so that the upper and lower surfaces of the occlusal guide 2 are tightly fitted with the upper and lower mandibular dentition respectively, so that the occlusal guide 2 can better restore the occlusal relationship of the patient's remaining dentition.

[0032] Exemplarily, the first fixing segment 12 and the second fixing segment 13 are each provided with at least two fixing nail holes 15, the first fixing segment 12 is connected and fixed to the mandibular ascending ramus on the affected side by screws passing through the fixing nail holes 15, and the second fixing segment 13 is connected and fixed to the mandibular bone on the remaining healthy side by screws passing through the fixing nail holes 15, the fixing nail holes 15 are arranged in a single row, and the diameter of the fixing nail holes 15 ranges from 1.5 mm to 2.0 mm.

[0033] Specifically, the mandibular reconstruction guide plate 1, the occlusal guide plate 2 and the connecting rod 3 are all formed by 3D printing, and the mandibular reconstruction guide plate 1, the occlusal guide plate 2 and the connecting rod 3 are integrally formed by 3D printing using a photosensitive resin material. Figure 1 and Figure 4 As shown, the mandibular reconstruction guide plate 1 cannot guarantee the accuracy of resetting due to the strength limitation of the photosensitive resin material, and a titanium metal plate is installed on the mandibular bone surface of the patient to fix it. The mandibular reconstruction plate 4 is a titanium metal strip with a curved shape matching the curved shape of the mandibular bone of the patient, and has mounting holes on the surface. Figure 1 The dotted line portion in the figure is the transplanted bone, and the mandibular reconstruction plate 4 is installed and fixed to the surface of the patient's mandibular bone to serve as a mechanical support for mandibular reconstruction and reduction.

[0034] Furthermore, the thickness of the mandibular reconstruction guide plate 1 is 2.9 mm to 3.1 mm, and the thickness value varies according to the bone characteristics of the remaining jaw body and the ascending ramus of the affected side of the patient to completely fit the bone surface. Furthermore, the thickness of the connecting rod 3 ranges from 4.9 mm to 5.1 mm.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A positioning guide for mandibular defect reconstruction surgery, characterized in that: It includes a mandibular reconstruction guide, an occlusal guide and a connecting rod, the inner side of the mandibular reconstruction guide is in contact with the bone surface of the outer edge of the mandible, the mandibular reconstruction guide includes a repair section that cooperates with the transplanted bone in the defective mandibular area, and a first fixed section and a second fixed section respectively connected to the two ends of the repair section, the first fixed section extends to cover the posterior edge of the mandibular ramus, the occlusal guide is provided with a positioning groove that cooperates with the tooth occlusion, the upper end of the connecting rod is detachably connected to the occlusal guide, and the lower end of the connecting rod is detachably connected to the mandibular reconstruction guide.

2. The positioning guide for mandibular defect reconstruction surgery according to claim 1, characterized in that: The front end face of the occlusal guide plate is provided with a first connecting protrusion, the front end face of the second fixing section is provided with a second connecting protrusion, the upper end of the connecting rod is provided with a first connecting groove that is buckled with the first connecting protrusion, and the lower end of the connecting rod is provided with a second connecting groove that is buckled with the second connecting protrusion.

3. The positioning guide for mandibular defect reconstruction surgery according to claim 2, characterized in that: The second fixing section extends to cover at least three tooth positions of the mandibular bone on the healthy side.

4. The positioning guide plate for mandibular defect reconstruction surgery according to claim 3, characterized in that: The second connecting protrusion is located on the mandible at the first tooth position on the healthy side of the second fixing section, adjacent to the repair section.

5. The positioning guide plate for mandibular defect reconstruction surgery according to claim 1, characterized in that: The repair segment covers at least one half of the area of ​​the transplanted bone in the defective mandibular region.

6. The positioning guide plate for mandibular defect reconstruction surgery according to claim 1, characterized in that: The upper surface and the lower surface of the occlusal guide plate are both provided with positioning grooves whose shapes match the maxillary dentition and the mandibular dentition on the healthy side.

7. The positioning guide plate for mandibular defect reconstruction surgery according to claim 1, characterized in that: The first fixing section and the second fixing section are both provided with fixing nail holes.

8. The positioning guide plate for mandibular defect reconstruction surgery according to claim 1, characterized in that: The mandibular reconstruction guide, the occlusal guide and the connecting rod are all formed by 3D printing.

9. The positioning guide plate for mandibular defect reconstruction surgery according to claim 1, characterized in that: The thickness of the mandibular reconstruction guide plate is 2.9 mm to 3.1 mm.

10. The positioning guide plate for mandibular defect reconstruction surgery according to claim 1, characterized in that: The thickness of the occlusal guide is 3 mm to 5 mm.

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