A mandibular body osteotomy protection device

Abstract

The present invention discloses a mandibular body osteotomy protection device. A set of devices includes two sets of osteotomy protection devices, namely, a proximal one and a distal one, both of which are irregular structures. Each of the two sets of osteotomy protection devices includes an inner baffle, an outer fixing rod, and a sliding screw assembly. The horizontal parts of the inner baffle and the outer fixing rod are located below the lower edge of the mandible, and their lengths are slightly smaller than the thickness of the mandibular body. The inner baffle includes a stress-bearing part corresponding to the fixing rod, a concave part within the osteotomy line area, a planar extension part, and a horizontal part of the inner baffle. The outer fixing rod includes a vertical part of the outer fixing rod, a lining on the bone contact surface of the outer fixing rod, and a horizontal part of the outer fixing rod. Through the design of this device, during the osteotomy process, it can effectively protect the soft tissues inside the mandible and avoid iatrogenic injuries caused by mandibular osteotomy or trimming instruments such as saw blades, drills, and osteotomes.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an osteotomy protection device for the mandibular body. Background Art

[0002] Partial mandibular defects caused by tumors, trauma, and inflammation are important clinical problems in the field of oral and maxillofacial surgery. With the increasing maturity of microsurgery and digital surgery techniques, autogenous free bone grafting and vascularized autogenous bone grafting have become important means for treating mandibular defects clinically. Whether it is traditional mandibular reconstruction surgery or computer-assisted digital mandibular reconstruction surgery, osteotomy during the operation is one of the most critical steps of such surgeries. The most frequently involved osteotomy area of the mandible clinically is the mandibular body. However, due to the special anatomical shape of the mandible, soft tissues such as muscles, blood vessels, and nerves on its inner side are extremely vulnerable to damage by instruments such as saw blades, drills, and bone chisels during osteotomy, thereby causing complications, prolonging the treatment cycle, and increasing the pain of patients.

[0003] Currently, there is no dedicated protection device for mandibular osteotomy clinically. Surgeons usually use surgical instruments such as tongue depressors and brain retractors for substitution, and even do not take protection measures during osteotomy. Using substitute instruments not only does not conform to the operation requirements in terms of shape, but also lacks measures for positioning and fixation, and requires the coordination and cooperation of assistants. Therefore, dangerous situations such as instrument position deviation and slippage often occur during the operation, affecting the surgical operation; while not taking protection measures is extremely likely to result in insufficient osteotomy depth and difficulty in detachment, or excessive osteotomy depth and damage to the inner soft tissues, increasing surgical trauma. Therefore, it is urgent to optimize and improve the existing technology and provide an osteotomy protection device for the mandibular body to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an osteotomy protection device for the mandibular body, which, while conforming to the basic anatomical shape of the mandibular body and combining the surrounding tissue conditions, can not only be accurately positioned but also be well fixed in the osteotomy area, effectively protect the inner tissue of the osteotomy area, and does not interfere with the osteotomy operation of the surgeon.

[0005] To achieve the above object, the present invention provides the following technical solution: A mandibular body osteotomy protection device. A set of devices includes two sets of osteotomy protection devices, namely the mesial and distal ones, both of which are irregular structures. Both sets of osteotomy protection devices include an inner baffle, an outer fixing rod, and a sliding screw assembly. The horizontal parts of the inner baffle and the outer fixing rod are located below the lower edge of the mandible, and their lengths are slightly smaller than the thickness of the mandibular body. The inner baffle includes a stress-bearing part corresponding to the fixing rod, a concave part within the osteotomy line area, a planar extension part, and a horizontal part of the inner baffle. The outer fixing rod includes a vertical part of the outer fixing rod, a lining on the bone contact surface of the outer fixing rod, and a horizontal part of the outer fixing rod. The horizontal part of the inner baffle is inserted into the hollow slideway of the horizontal part of the outer fixing rod, forming a nested structure. The horizontal part of the inner baffle is connected to the horizontal part of the outer fixing rod through the sliding screw assembly and can be locked to adjust the width of the horizontal part according to the thickness of the mandible. The outer fixing rod is located at the healthy side end of the osteotomy line and is made of metal. The height of the vertical part of the outer fixing rod is lower than the stress-bearing part corresponding to the fixing rod. To increase the friction and avoid damaging the healthy side mandibular bone wall, the lining on the bone contact surface of the outer fixing rod is made of hard rubber material. According to the basic shape of the cross-section of the mandibular body, the vertical parts of the inner baffle and the outer fixing rod are designed to be inwardly converging from the bottom to the top;

[0006] The sliding screw assembly includes a screw, a connecting pipe, a gasket, and a nut. The connecting pipe is fixedly installed inside the horizontal part of the inner baffle. The top and bottom of the connecting pipe are both open structures. A screw is arranged above the connecting pipe. A gasket is arranged at the bottom of the horizontal part of the outer fixing rod and corresponding to the position of the connecting pipe. A nut that cooperates with the screw is arranged below the gasket.

[0007] Preferably, the inner baffle is designed as a partial L shape on the healthy side.

[0008] Preferably, the outer fixing rod is designed as an overall L shape.

[0009] Preferably, the inner baffle is made of all-metal material, and its height is greater than the height of the mandibular body.

[0010] Preferably, the height of the planar extension part is lower than the height of the concave part within the osteotomy line area, showing an arc-shaped decline.

[0011] Preferably, the vertical part of the outer fixing rod is designed with a hollow structure.

[0012] Preferably, the inward convergence angle of the inner baffle is 3°, and the inward convergence angle of the outer fixing rod is about 5°.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. Through the design of this device, the soft tissues inside the mandible can be effectively protected during osteotomy, avoiding iatrogenic injuries caused by mandibular osteotomy or trimming instruments such as saw blades, drills, and osteotomes.

[0015] 2. Since this device can be stably positioned in the osteotomy area of the mandibular body, the operator can complete the osteotomy operation independently without the cooperation of an assistant, reducing the difficulty of the osteotomy operation.

[0016] 3. This device is applicable to both traditional mandibular body osteotomy and mandibular body osteotomy assisted by a 3D printed osteotomy guide plate.

[0017] 4. The operation is simple and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of the front view of the present invention;

[0019] Figure 2 is a structural schematic diagram of two sets of osteotomy protection devices, the proximal and distal ones, of the present invention;

[0020] Figure 3 is a three-dimensional structural schematic diagram of the side view of the present invention;

[0021] Figure 4 is an outer assembly schematic diagram of the present invention;

[0022] Figure 5 is an inner assembly schematic diagram of the present invention.

[0023] In the figure: 1 inner baffle, 11 corresponding stressed part of the fixing rod, 12 concave part within the osteotomy line area, 13 planar extension part, horizontal part of the inner baffle, 2 outer fixing rod, 21 vertical part of the outer fixing rod, 22 lining on the bone contact surface of the outer fixing rod, 23 horizontal part of the outer fixing rod, 3 sliding screw assembly, 31 screw, 32 communication pipe, 33 gasket, 34 nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Please refer to Figures 1-5, A mandibular body osteotomy protection device. A set of devices includes two sets of osteotomy protection devices, namely the mesial and distal ones, both of which are irregular structures. Each set of osteotomy protection devices includes an inner baffle 1, an outer fixing rod 2, and a sliding screw assembly 3. The horizontal parts of the inner baffle 1 and the outer fixing rod 2 are located below the lower border of the mandible, and their lengths are slightly less than the thickness of the mandibular body. The inner baffle 1 is designed as a partial L-shape on the healthy side, and the outer fixing rod 2 is designed as an overall L-shape. The inner baffle 1 is made of all-metal material, and its height is greater than the height of the mandibular body. The inner baffle 1 includes a force-bearing part 11 corresponding to the fixing rod, an in concave part 12 within the osteotomy line area, a planar extension part 13, and a horizontal part of the inner baffle. The outer fixing rod 2 includes a vertical part 21 of the outer fixing rod, an inner lining 22 of the bone contact surface of the outer fixing rod, and a horizontal part 23 of the outer fixing rod. The horizontal part of the inner baffle is inserted into the hollow slideway of the horizontal part 23 of the outer fixing rod, forming a nested structure. The horizontal part of the inner baffle and the horizontal part 23 of the outer fixing rod are connected and lockable through the sliding screw assembly 3 to adjust the width of the horizontal part according to the thickness of the mandible. The height of the planar extension part 13 is lower than the height of the in concave part 12 within the osteotomy line area, showing an arc-shaped decline. The outer fixing rod 2 is located at the healthy side end of the osteotomy line, made of metal. The vertical part 21 of the outer fixing rod is designed with a hollow structure, and the height of the vertical part 21 of the outer fixing rod is lower than the force-bearing part 11 corresponding to the fixing rod. To increase the friction and avoid damaging the healthy side of the mandibular bone wall, the inner lining 22 of the bone contact surface of the outer fixing rod is made of hard rubber material. According to the basic shape of the cross-section of the mandibular body, the vertical parts of the inner baffle 1 and the outer fixing rod 2 are designed to be inwardly converging from the bottom to the top. The inward convergence angle of the inner baffle 1 is 3°, and the inward convergence angle of the outer fixing rod 2 is approximately 5°.

[0026] The sliding screw assembly 3 includes a screw 31, a connecting pipe 32, a gasket 33, and a nut 34. The connecting pipe 32 is fixedly installed inside the horizontal part of the inner baffle. Both the top and bottom of the connecting pipe 32 are open structures. The screw 31 is arranged above the connecting pipe 32. A gasket 33 is arranged at the bottom of the horizontal part 23 of the outer fixing rod and corresponding to the position of the connecting pipe 32. A nut 34 that cooperates with the screw 31 is arranged below the gasket 33.

[0027] Working principle:

[0028] When performing traditional mandibular osteotomy, expose the lateral surface of the mandible and the lower border of the mandible in the osteotomy area, separate the soft tissues and gingiva on the inner side of the diseased mandible. After confirming the position of the osteotomy line, select the corresponding mesial or distal osteotomy protection device, and then perform vertical positioning. Insert the inner baffle 1 closely against the inner bone wall of the mandible from bottom to top until the upper end of the inner baffle 1 exposes the free gingival margin in the mouth, and there is a gap between the horizontal part of the device and the lower border of the mandible. After vertical positioning, perform horizontal position adjustment so that the osteotomy line is located in the concave part 12 of the osteotomy line area, ensuring that the osteotomy saw blade can penetrate the entire thickness of the mandible. Then, adjust the position of the outer fixing rod 2 so that the inner lining 22 of the bone contact surface of the outer fixing rod closely adheres to the healthy bone cortex of the mandible. After pressing, lock the screw 31 below the device, thereby fixing the whole device to the body of the mandible.

[0029] When performing computer-aided digital mandibular osteotomy surgery, expose the lateral surface of the mandible and the lower border of the mandible in the osteotomy area, separate the soft tissues and gingiva on the inner side of the diseased mandible, install the osteotomy guide plate according to the preoperative design and fix it with screws, and select the corresponding mesial or distal osteotomy protection device according to the position of the osteotomy line; then perform vertical positioning. Insert the inner baffle 1 closely against the inner bone wall of the mandible from bottom to top until the upper end of the inner baffle 1 exposes the free gingival margin in the mouth, and there is contact or a certain gap between the horizontal part of the device and the osteotomy guide plate. After vertical positioning, perform horizontal position adjustment so that the concave part 12 in the osteotomy line area corresponds to the osteotomy line position on the osteotomy guide plate, ensuring that the osteotomy saw blade can penetrate the entire thickness of the mandible. Then, adjust the position of the outer fixing rod 2 so that the inner lining 22 of the bone contact surface of the outer fixing rod closely adheres to the surface of the osteotomy guide plate. After pressing, lock the screw 31 below the device, thereby fixing the whole device to the body of the mandible.

[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mandibular body osteotomy protection device. A set of devices includes two sets of osteotomy protection devices, namely a mesial set and a distal set, both of which are irregular structures. Each of the two sets of osteotomy protection devices includes a medial baffle (1), a lateral fixing rod (2), and a sliding screw assembly (3), and is characterized in that: The horizontal part of the inner baffle (1) and the horizontal part of the outer fixing rod (2) are located below the lower edge of the mandible, and their lengths are slightly less than the thickness of the mandibular body. The inner baffle (1) includes the corresponding stressed part (11) of the fixing rod, the concave part (12) in the osteotomy line area, the plane extension part (13) and the horizontal part of the inner baffle. The outer fixing rod (2) includes the vertical part (21) of the outer fixing rod, the lining (22) on the bone contact surface of the outer fixing rod and the horizontal part (23) of the outer fixing rod. The horizontal part of the inner baffle is inserted into the hollow slideway of the horizontal part (23) of the outer fixing rod, forming a nested structure. The horizontal part of the inner baffle and the horizontal part (23) of the outer fixing rod are connected and lockable through a sliding screw assembly (3) to adjust the width of the horizontal part according to the thickness of the mandible. The outer fixing rod (2) is located at the healthy side end of the osteotomy line and is made of metal. The height of the vertical part (21) of the outer fixing rod is lower than that of the corresponding stressed part (11) of the fixing rod. To increase the friction and avoid damaging the healthy side mandibular bone wall, the lining (22) on the bone contact surface of the outer fixing rod is made of hard rubber material. According to the basic shape of the cross-section of the mandibular body, the vertical parts of the inner baffle (1) and the outer fixing rod (2) are designed to be inwardly converging from the bottom to the top; The sliding screw assembly (3) includes a screw (31), a connecting pipe (32), a gasket (33) and a nut (34). The connecting pipe (32) is fixedly installed inside the horizontal part of the inner baffle. The top and bottom of the connecting pipe (32) are open structures. The screw (31) is arranged above the connecting pipe (32). A gasket (33) is arranged at the bottom of the horizontal part (23) of the outer fixing rod and corresponding to the position of the connecting pipe (32). The nut (34) used in cooperation with the screw (31) is arranged below the gasket (33).

2. The mandibular body osteotomy protection device according to claim 1, characterized in that: The inner baffle (1) is designed as a partial L shape on the healthy side.

3. The mandibular body osteotomy protection device according to claim 2, characterized in that: The outer fixing rod (2) is designed as an overall L shape.

4. The mandibular body osteotomy protection device according to claim 3, characterized in that: The inner baffle (1) is made of all-metal material, and its height is greater than the height of the mandibular body.

5. The mandibular body osteotomy protection device according to claim 4, wherein: The height of the plane extension part (13) is lower than that of the concave part (12) in the osteotomy line area, showing an arc-shaped decline.

6. The mandibular body osteotomy protection device according to claim 5, wherein: The vertical part (21) of the outer fixing rod is designed with a hollow structure.

7. The mandibular body osteotomy protection device according to claim 6, wherein: The inward convergence angle of the inner baffle (1) is 3°, and the inward convergence angle of the outer fixing rod (2) is about 5°.

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