An absorbable plate shaping and fixation device for assisting sagittal split ramus osteotomy

Abstract

The present invention discloses an absorbable plate shaping and fixing device for assisting sagittal split ramus osteotomy, which relates to the technical field of auxiliary equipment for sagittal split ramus osteotomy. The device includes a shaping frame and a fixing frame, and the shaping frame and the fixing frame are connected by a connecting piece. A plurality of nail holes are provided on both the shaping frame and the fixing frame. The fixing frame in the present invention can play a role in temporarily stabilizing the free bone block, and at the same time, the shaping frame can also assist the absorbable plate to perform rapid and accurate shaping.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary devices for sagittal split osteotomy of the mandibular ramus, and particularly to a device for shaping and fixing an absorbable plate after auxiliary sagittal split of the mandibular ramus. Background Art

[0002] For the corrective surgery of underbite in oral orthognathic surgery, the previous internal fixation method basically used a titanium alloy metal plate for fixation. This metal plate has good repeatable bending property and high strength, and is used for internal fixation of the bone fragments at the bone fracture ends after splitting the mandibular ramus bone to assist the healing of the bone fracture ends. However, since the titanium alloy plate needs to be removed by a second operation after titanium metal fixation, a domestic absorbable craniofacial fixation plate system has gradually emerged on the market.

[0003] The existing absorbable plate has basically the same shape as the titanium alloy plate. However, when the occlusal relationship is not satisfactory during the surgical fixation, the doctor needs to repeatedly adjust the position and shape of the external fixation device. Since the absorbable plate cannot be bent multiple times, it cannot be directly used in the sagittal split osteotomy of the mandibular ramus. In addition, after the nail holes of the absorbable nails are implanted and removed multiple times, the inner diameter of the nail holes will expand, resulting in insecure fixation of the absorbable nails. Therefore, an auxiliary fixation device is needed to enable the doctor to observe the intraoperative occlusal state without bending the absorbable plate and drilling the absorbable nails in advance. And the shaping frame of this device is detachable, and the detachable shaping frame can be taken out of the body to assist in bending the absorbable plate, and it will not affect the fixation of the free bone block.

[0004] Therefore, there is an urgent need in the art for a device for shaping and fixing an absorbable plate after auxiliary sagittal split of the mandibular ramus to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for shaping and fixing an absorbable plate after auxiliary sagittal split of the mandibular ramus to solve the problems existing in the above prior art. The fixed frame is used to maintain the fixed state of the free bone block, and the shaping frame can be used to quickly and accurately shape the absorbable plate.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The present invention discloses a device for shaping and fixing an absorbable plate after auxiliary sagittal split of the mandibular ramus, which is characterized in that: it includes a shaping frame and a fixed frame, the shaping frame and the fixed frame are connected by a connecting member, and a plurality of nail holes are provided on both the shaping frame and the fixed frame;

[0008] The materials of the shaping frame, the fixed frame and the connecting member are all metal materials;

[0009] The fixing frame and the shaping frame are fixed to the bone surface by tapping screws; the tapping screws are stainless steel nails or titanium nails;

[0010] The shaping frame is of a straight structure, and four nail holes are provided at intervals on the shaping frame;

[0011] The fixing frame is of a straight structure, and one nail hole is provided at each end of the fixing frame. The fixing frame and the shaping frame are connected by two of the connecting pieces, and the two ends of the fixing frame are bent away from the shaping frame; alternatively, the fixing frame is of a hook-shaped structure, and three nail holes are provided on the fixing frame. The shaping frame is arranged in the middle of the fixing frame, and both sides of the shaping frame are connected to both sides of the fixing frame by one of the connecting pieces; alternatively, the fixing frame is of a U-shaped structure, and three nail holes are provided on the fixing frame. The shaping frame is arranged in the middle of the fixing frame, and both sides of the shaping frame are connected to both sides of the fixing frame by one of the connecting pieces.

[0012] The present invention has achieved the following technical effects compared with the prior art:

[0013] Based on clinical practical applications, since the stable effect of the fixing frame can ensure the stability of temporary fixation, allowing the doctor to freely observe the facial appearance during temporary fixation. And because the absorbable plate shaping and fixing device for assisting sagittal split of the mandibular ramus after has good bendability, the position can be adjusted repeatedly to fix the bone block until satisfactory. The detachable form of the shaping frame can keep the proximal and distal bone blocks of the mandibular ramus in an appropriate position, and the absorbable plate can be bent into the required shape outside, and then fixed on the bone block at one time after bending. By guiding the fixation of the absorbable plate through the absorbable plate shaping and fixing device for assisting sagittal split of the mandibular ramus after, the generation of secondary surgery after using titanium metal fixation can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic structural diagram of the absorbable plate shaping and fixing device for assisting sagittal split of the mandibular ramus after in Embodiment 1;

[0016] Figure 2 It is a schematic structural diagram of the absorbable plate shaping and fixing device for assisting sagittal split of the mandibular ramus after in Embodiment 2;

[0017] Figure 3 Schematic diagram of the structure of the absorbable plate shaping and fixing device for assisting sagittal split ramus osteotomy in Example 3;

[0018] Figure 4 The fixed frame in the fixed state in Step 2 of the method for shaping and fixing the absorbable plate after assisting sagittal split ramus osteotomy in Example 4;

[0019] Figure 5 Front view of the removed shaping frame in Step 2 of the method for shaping and fixing the absorbable plate after assisting sagittal split ramus osteotomy in Example 3;

[0020] Figure 6 Side view of the removed shaping frame in Step 2 of the method for shaping and fixing the absorbable plate after assisting sagittal split ramus osteotomy in Example 3;

[0021] Figure 7 Schematic diagram of Step 3 in the method for shaping and fixing the absorbable plate after assisting sagittal split ramus osteotomy in Example 3;

[0022] Figure 8 Schematic diagram of Step 4 in the method for shaping and fixing the absorbable plate after assisting sagittal split ramus osteotomy in Example 3;

[0023] In the figure: 1 - shaping frame; 2 - fixed frame; 3 - connecting piece. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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] The purpose of the present invention is to provide a device for shaping and fixing an absorbable plate after assisting sagittal split ramus osteotomy to solve the problems existing in the above-mentioned prior art. A fixed frame is used to maintain the fixed state of the free bone block, and a shaping frame can be used to quickly and accurately shape the absorbable plate.

[0026] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0027] Example 1

[0028] As Figure 1As shown in the figure, the present invention provides an absorbable plate shaping and fixing device for assisting sagittal split ramus osteotomy, which includes a shaping frame 1 and a fixing frame 2. The shaping frame 1 and the fixing frame 2 are connected by a connecting member 3. A number of integrally arranged nail holes are provided on both the shaping frame 1 and the fixing frame 2. It should be noted that one, multiple (two or more) or all of the nail holes on the fixing frame 2 can be set as oval or elongated holes, the purpose of which is to facilitate the adjustment of the position between the two bone blocks.

[0029] The materials of the shaping frame 1, the fixing frame 2 and the connecting member 3 are all metal materials, specifically including but not limited to stainless steel. Among them, the shaping frame 1 and the fixing frame 2 can be bent and deformed to a certain extent, and the nail holes on the shaping frame 1 and the fixing frame 2 are integrally formed. The connecting member 3 is cut to minimize its diameter to form a structure that can be broken by an external force. In actual application, a common surgical forceps can easily cut it.

[0030] The fixing frame 2 and the shaping frame 1 are fixed to the bone surface by tapping screws. The function of the tapping screws is not only to fix the fixing frame 2 and the shaping frame 1, but also to tap on the bone surface to form screw holes, which is convenient for the subsequent installation of absorbable screws.

[0031] Further, the tapping screws include but are not limited to existing stainless steel nails or titanium nails.

[0032] The shaping frame 1 is of a straight structure, and four nail holes are provided on the shaping frame 1 at intervals.

[0033] As Figure 1 shown in the figure, the fixing frame 2 is of a straight structure, and a nail hole is provided at each end of the fixing frame 2. This form of fixing frame 2 is suitable for the case where absorbable screws are easy to insert. The fixing frame 2 and the shaping frame 1 are connected by two connecting members 3. The fixing frame 2 and the shaping frame 1 can be arranged parallel to each other (as Figure 1 shown). Or, the two ends of the fixing frame 2 are bent away from the shaping frame 1, and such a setting can better adapt to the anatomical shape of the anterior margin of the ramus.

[0034] In actual use, first attach the absorbable plate shaping and fixing device for assisting sagittal split ramus osteotomy to the bone surface and bend it to a certain extent. Then use screws to fix the fixing frame 2 and remove the shaping frame 1. Overlap the shaped shaping frame 1 with the absorbable plate and place it in hot water, and assist the shaping of the absorbable plate through the shape of the shaping frame 1. Fix the shaped absorbable plate to the position of the original shaping frame 1 on the bone surface with absorbable nails. After successfully fixing the absorbable plate and removing the screw tails on the fixing frame 2, remove the fixing frame 2, and the auxiliary fixing is completed.

[0035] Example Two

[0036] As Figure 2 shown, this embodiment provides an absorbable plate shaping and fixing device for assisting sagittal split ramus osteotomy. The technical features in this embodiment are basically the same as those disclosed in Example One, and the differences are as follows:

[0037] In this embodiment, the fixing frame 2 is a hook-shaped structure, specifically including a long side and a short side, and the same ends of the long side and the short side are connected by an arc edge. There are three screw holes on the fixing frame 2, one of which is arranged at the free end of the long side, and the other two screw holes are respectively at a corresponding position on the long side and the opposite side. The shaping frame 1 is arranged in the middle of the fixing frame 2 (that is, between the long side and the short side), and both sides of the shaping frame 1 are respectively connected to both sides of the fixing frame 2 through a connecting piece 3.

[0038] Example Three

[0039] As Figure 3 shown, this embodiment provides an absorbable plate shaping and fixing device for assisting sagittal split ramus osteotomy. The technical features in this embodiment are basically the same as those disclosed in Example One, and the differences are as follows:

[0040] In this embodiment, the fixing frame 2 is a U-shaped structure. There are three screw holes on the fixing frame 2, one screw hole is respectively arranged at each of the two free ends of the U-shaped structure, and one screw hole is also arranged on one of the sides. The shaping frame 1 is arranged in the middle of the fixing frame 2 (that is, between the two sides), and both sides of the shaping frame 1 are respectively connected to both sides of the fixing frame 2 through a connecting piece 3.

[0041] Example Four

[0042] As Figures 4 - 8 shown, this embodiment provides a method for shaping and fixing an absorbable plate for assisting sagittal split ramus osteotomy. Based on the absorbable plate shaping and fixing device for assisting sagittal split ramus osteotomy in Examples One to Three, it includes the following steps:

[0043] Step One: Select an absorbable plate shaping and fixing device for assisting sagittal split ramus osteotomy with a suitable shape. Any one of Examples One to Three can be selected. This embodiment takes Example Three as an example for illustration.

[0044] Step Two: Bend the absorbable plate shaping and fixing device for assisting sagittal split ramus osteotomy and make it fit the bone surface. Fix the fixing frame 2 and the shaping frame 1 on the bone surface through tapping screws. During the fixing process, the tapping screws can tap threads on the bone surface to form corresponding screw holes, and observe the occlusion state. Figure 3The left screw hole therein is an oval hole or a long strip hole. When installing the tapping screw, the tapping screw on the left oval or long strip hole can be loosened first, while the two tapping screws on the right can be directly tightened. Since the left tapping screw is not tightened with the corresponding oval or long strip hole, the bone surface on the left can displace a small distance, thereby adjusting the positional relationship between the two bone surfaces. When the positional relationship between the two bone surfaces reaches the expected position, then tighten the left tapping screw. Then use a surgical forceps to cut off the connecting member 3 and then remove the shaping frame 1.

[0045] Step three: Overlap the shaping frame 1 and the absorbable plate and place them together in hot water to shape the absorbable plate.

[0046] Step four: Fix the absorbable plate at the original corresponding screw holes of the shaping frame 1 through absorbable screws. The advantage of this setting is that there is no need to re-tap when installing the absorbable plate. After fixing the absorbable plate, remove the tail end of the absorbable screw, and then remove the fixing frame 2.

[0047] In this embodiment, the hot water temperature in step three is 70°C - 85°C. At a temperature of 70°C - 85°C, the absorbable plate is shaped with the shaping frame 1 as a template. Further, the materials of both the absorbable plate and the absorbable screws are left-handed polylactic acid, and there is no need for a second operation to remove them later.

[0048] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A device for shaping and fixing an absorbable plate after sagittal splitting of the mandibular ramus, characterized in that: It includes a shaping frame and a fixing frame, wherein the shaping frame and the fixing frame are connected via a connecting piece, and a plurality of nail holes are provided on the shaping frame and the fixing frame; The shaping frame, the fixing frame and the connecting piece are all made of metal; The fixing frame and the shaping frame are fixed to the bone surface by tapping screws; the tapping screws are stainless steel nails or titanium nails; the screw holes originally corresponding to the shaping frame are used to fix the absorbable plate by absorbable screws, and no re-tapping is required when installing the absorbable plate; The shaping frame is a straight-line structure, and four nail holes are arranged at intervals on the shaping frame; The fixed frame is a straight-line structure, with a nail hole provided at each end of the fixed frame, the fixed frame and the shaping frame are connected by two connecting pieces, and the two ends of the fixed frame are bent in the direction away from the shaping frame; or, the fixed frame is a hook-shaped structure, with three nail holes provided on the fixed frame, the shaping frame is arranged in the middle of the fixed frame, and the two sides of the shaping frame are connected to the two sides of the fixed frame by one of the connecting pieces respectively; or, the fixed frame is a U-shaped structure, with three nail holes provided on the fixed frame, the shaping frame is arranged in the middle of the fixed frame, and the two sides of the shaping frame are connected to the two sides of the fixed frame by one of the connecting pieces respectively.

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