Fusion cage for restoring and fixing skull flap

Abstract

The utility model discloses a fusion cage for reducing and fixing a skull flap. The fusion cage comprises a flap fixing body and a fusion body, the bone flap fixing body comprises a fixing plate, a protruding clamping table is arranged on one side of the fixing plate, the fixing plate and the clamping table are connected to form a T-shaped structure, and a plurality of nail placing holes are formed in the fixing plate. The fusion body is arranged on the side, provided with the clamping table, of the bone flap fixing body in a staggered mode, a clamping groove matched with the clamping table in shape is formed in the fusion body, the clamping table is embedded into the clamping groove and fixedly clamped with the clamping groove, and a plurality of bone grafting holes are formed in the fusion body. According to the fusion cage for reducing and fixing the skull flap, not only can the skull flap be reduced and fixed, but also the purposes of filling gaps left by drill holes and milling cutters, manually biting and removing missing parts caused by bone substances and promoting skull fusion can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fusion devices, and particularly relates to a fusion device for replacing and fixing a cranial bone flap. Background Art

[0002] In neurosurgical craniotomy, in order to facilitate intraoperative exposure, it is often necessary to use a main drill, a milling cutter and a burr to open the bone flap to expose the surgical space before performing operations related to the skull and intracranial. The artificially opened bone flap, as a part of the whole skull, plays an indispensable role in maintaining the stability of intracranial pressure, protecting the brain tissue and maintaining the appearance. Therefore, after completing a surgical operation involving the replacement of the opened skull, doctors usually use a skull fixation device to replace the bone flap in situ and reshape the integrity of the skull.

[0003] At present, porous titanium alloy snowflake pieces are the most commonly used and common skull fixation devices in clinical practice. Since the process of using a milling cutter and a main drill to open the skull and expose the surgical space requires active grinding or biting off of some bone mass to expand the surgical area, different degrees of bone mass loss will be caused. After retaining the bone flap for fixation, there will be bone loss caused by the holes at the main drill hole positions, the gaps opened by the milling cutter in the bone flap, and the voids generated by grinding the bone mass between the bone flap and the skull. The width of these bone defect parts depends on the size of the main drill bit (9mm, 13mm), the width of the milling cutter (2 - 4mm), and the size of the surgical field exposure. Most of the gaps in the milling cutter bone flap can gradually heal in the later stage, but most of the parts opened by the main drill and artificially bitten off cannot be fused due to the too wide gap. In some patients, a certain degree of cerebrospinal fluid pulsation may occur at these positions after the operation, increasing the psychological burden and overall aesthetics of the patient, and losing the protective function of this part of the skull. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the above background art, and provide a fusion device for replacing and fixing a cranial bone flap, which can not only realize the replacement and fixation of the bone flap, but also realize the purpose of filling the holes, the gaps left by the milling cutter, the missing parts caused by artificially biting off the bone mass and promoting bone fusion.

[0005] To achieve the above purpose, a fusion device for replacing and fixing a cranial bone flap provided by the utility model includes a bone flap fixing body and a fusion body; the bone flap fixing body includes a fixing plate, a convex clamping platform is arranged on one side of the fixing plate, the fixing plate and the clamping platform are connected to form a T-shaped structure, and a plurality of nail holes are opened on the fixing plate;

[0006] The fusion body is arranged on one side of the bone flap fixing body with a clamping platform in a staggered manner. A clamping groove matching the shape of the clamping platform is arranged on the fusion body, and the clamping platform is embedded in the clamping groove and clamped and fixed thereto. A plurality of bone grafting holes are formed in the fusion body.

[0007] Further, the clamping platform has a frustum of a pyramid structure. The top surface of the clamping platform is fixedly connected to the fixing plate. The bottom surface of the clamping platform extends downward and is embedded in the clamping groove to be clamped tightly. The size of the clamping platform gradually increases from the top surface to the bottom surface.

[0008] Further, the fusion body includes a top end surface, a bottom end surface, and side surfaces on both sides. The clamping groove is arranged on the top end surface of the fusion body and extends towards the middle to match the shape of the clamping platform.

[0009] Further, a plurality of bendable grooves are arranged on the side surfaces on both sides of the fusion body.

[0010] Further, the side surfaces on both sides of the fusion body have a serrated or corrugated structure.

[0011] Further, extension bodies are further arranged at both ends of the fusion body, and a plurality of bone grafting through holes are arranged on the extension bodies.

[0012] Further, the extension body includes a top wall, a bottom wall, and side walls on both sides. A plurality of bendable concave grooves are arranged on the side walls on both sides of the extension body.

[0013] Further, the side walls on both sides of the extension body have a serrated or corrugated structure.

[0014] Still further, the extension body and the fusion body are of an integrally formed structure.

[0015] Even further, the bone flap fixing body and the fusion body are components made of PEEK material.

[0016] Compared with the prior art, the present utility model has the following advantages:

[0017] Firstly, the fusion device of the present utility model can not only realize the reduction and fixation of the bone flap. Besides having the basic functions of traditional titanium alloy snowflake pieces, it can also achieve the ultimate goals of filling the gaps left by drilling and milling cutters, filling the missing parts caused by artificial bone biting, and promoting bone fusion.

[0018] Second, the fusion device of the present utility model uses a non-metallic PEEK (polyetheretherketone) material as the raw material of the fusion device. As a material with excellent properties such as high temperature resistance, self-lubrication, easy processing, and high mechanical strength, the PEEK material has very high safety and is widely used in medical fields such as skull repair and vertebral body fusion. It has the characteristics of good plasticity, high strength, promoting bone growth, and good biocompatibility. The PEEK material has high mechanical strength. When replacing and fixing the skull bone flap, its mechanical properties are not weaker than those of titanium alloy snowflakes. As a non-metallic material, it can greatly reduce the artifacts generated by metal interference during postoperative MRI or CT examinations of patients.

[0019] Third, the fusion body of the fusion device of the present utility model can be stacked according to surgical needs to adjust the thickness of the fusion body. The length of the fusion body can also be adjusted by increasing or decreasing the length of the extension body to increase or decrease the nail insertion points, so as to meet the replacement and fixation of the bone flap in different situations. For example, during the operation, if more bone mass needs to be removed due to the need to remove lesions and the bone defect gap is relatively wide, it can be satisfied by increasing the thickness of the fusion structure. It has the characteristics of good plasticity, high strength, promoting bone growth, and good biocompatibility, and has been widely used in skull repair and vertebral body fusion.

[0020] Fourth, the fusion device of the present utility model can effectively fill bone defects, restore the integrity of the skull to the greatest extent, and better promote the bony fusion of the bone flap and the skull. For example, in surgeries in the posterior cranial fossa area, due to the limited operation of the milling cutter and the complexity of the structure, it is often necessary to grind away a large part of the bone mass to meet the requirements of the surgical field, and the probability of cerebrospinal fluid leakage after surgery is also relatively high. After this fusion device effectively fills the bone defect area, it can provide an attachment point for the healing of muscles and fibrous tissues, and increase the tissue adherence and the support for wound healing.

[0021] Fifth, the traditional snowflake bone flap plate is fixed on the outer side of the skull, and occasionally a small part of the bone flap may shift. The combination of the bone flap fixing body and the fusion body designed in the present utility model and the serrated pattern on the side of the fusion body can effectively increase the friction with the skull part. The fusion body increases the "anchoring" points of the bone flap by being stuck in the gap, greatly reducing the potential bone flap dislocation and effectively fixing the bone flap.

[0022] Sixth, the fusion device of the present utility model is designed with a downward protruding part of the fusion body below the bone flap fixing body to fill the bone defect at the drilling site, effectively avoiding the situation where the scalp drilling position pulsates with cerebrospinal fluid after surgery, and maximizing the guarantee of the integrity and aesthetics of the skull. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a fusion device for replacing and fixing a skull bone flap;

[0024] Figure 2Schematic diagram of another perspective sectional view of a fusion device for replacing and fixing a cranial bone flap;

[0025] Figure 3 Schematic diagram of the structure of the bone flap fixing body;

[0026] Figure 4 Schematic diagram of the structure of the fusion body;

[0027] Figure 5 Schematic diagram of the structure of the extension body;

[0028] Figure 6 Schematic diagram of artificially separating a bone flap to expose the surgical field during a conventional craniotomy in neurosurgery;

[0029] Figure 7 Schematic diagram of the structure of a fusion device for replacing and fixing a cranial bone flap after fixation;

[0030] In the figure: bone flap fixing body 1, fixing plate 101, clamping platform 102, screw placement holes 103, fusion body 2, card slot 201, bone grafting holes 202, top end face 203, bottom end face 204, side face 205, groove 206, extension body 3, bone grafting through holes 301, top wall 302, bottom wall 303, side wall 304, concave groove 305, free bone flap 4, bone holes 401, skull 5, drill hole 6, dura mater 7. Detailed implementation mode

[0031] The following will describe in detail the implementation of the present utility model in combination with implementation cases, but they do not constitute a limitation to the present utility model and are only for illustration purposes. At the same time, the advantages of the present utility model will become clearer and easier to understand.

[0032] As Figure 1 and Figure 2 shown, a fusion device for replacing and fixing a cranial bone flap includes a bone flap fixing body 1 and a fusion body 2. The bone flap fixing body 1 and the fusion body 2 are components made of PEEK material (polyetheretherketone). The PEEK material has high mechanical strength, and its mechanical properties are strong when replacing and fixing the cranial bone flap; as a non-metallic material, it can greatly reduce the artifacts generated by metal interference during the postoperative MRI or CT examination of the patient.

[0033] As Figure 3 shown, the bone flap fixing body 1 includes a fixing plate 101. A raised clamping platform 102 is provided on one side of the fixing plate 101. The fixing plate 101 and the clamping platform 102 are connected to form a T-shaped structure, and a plurality of screw placement holes 103 are provided on the fixing plate 101.

[0034] As Figure 4As shown in the figure, the fusion body 2 is arranged on one side of the bone flap fixing body 1 with a clamping platform 102 in an alternating manner. A clamping groove 201 matching the shape of the clamping platform 102 is arranged on the fusion body 2. The clamping platform 102 is embedded in the clamping groove 201 and clamped and fixed with it. A plurality of bone grafting holes 202 are formed on the fusion body 2. The clamping platform 102 has a frustum of a pyramid structure. The top surface of the clamping platform 102 is fixedly connected to the fixing plate 101. The bottom surface of the clamping platform 102 extends downward and is embedded in the clamping groove 201 to be clamped tightly. The size of the clamping platform 102 gradually increases from the top surface to the bottom surface. The fusion body 2 and the bone flap fixing body 1 can be clamped and fixed without moving through the interference fit between the clamping platform 102 and the clamping groove 201. In addition, the fusion body 2 and the bone flap fixing body 1 can also adopt an integrally formed structure. The fusion body 2 includes a top end surface 203, a bottom end surface 204, and side surfaces 205 on both sides. The clamping groove 201 is arranged on the top end surface 203 of the fusion body 2 and extends toward the middle to match the shape of the clamping platform 102. A plurality of bendable grooves 206 are arranged on the side surfaces 205 on both sides of the fusion body 2. The side surfaces 205 on both sides of the fusion body 2 have a serrated or corrugated structure. The serrated or corrugated structure can effectively increase the friction with the cranial part. The fusion body increases the "anchoring" points of the bone flap by being stuck in the gap, greatly reducing the potential displacement of the bone flap and effectively fixing the bone flap.

[0035] As Figure 5 shown, extension bodies 3 are further arranged at both ends of the fusion body 2. A plurality of bone grafting through holes 301 are arranged on the extension bodies 3. The extension body 3 includes a top wall 302, a bottom wall 303, and side walls 304 on both sides. A plurality of bendable concave grooves 305 are arranged on the side walls 304 on both sides of the extension body 3. The side walls 304 on both sides of the extension body 3 have a serrated or corrugated structure. The extension body 3 and the fusion body 2 are of an integrally formed structure. According to the actual situation, the length can be adjusted by adding extension bodies at both ends of the fusion body, or the angle can be adjusted by bending the concave groove part with an external force.

[0036] As Figure 6 and Figure 7 shown, in the craniotomy for replacing the skull bone flap, by using the fusion device of the present utility model, not only can the bone flap be fixed and replaced in situ, but also the gaps left by the drill and the milling cutter and the missing parts caused by artificially biting off the bone mass can be filled, achieving the ultimate goal of promoting bone fusion. The fusion device of the present utility model can effectively fill the bone defect, restore the integrity of the skull to the greatest extent, and better promote the bone fusion between the bone flap and the skull. For example, in the operation of the posterior cranial fossa area, due to the limited operation of the milling cutter and the complexity of the structure, a large part of the bone mass often needs to be ground to meet the requirements of the surgical field, and the probability of cerebrospinal fluid leakage after the operation is also relatively high. After this fusion device effectively fills the bone defect area, it can provide an attachment point for the healing of muscles and fibrous tissues, increasing tissue adherence and the support for wound healing.

[0037] The above are only the specific embodiments of the present utility model. It should be noted that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. The rest not described in detail is the prior art.

Claims

1. A fusion device for returning and fixing a skull bone flap, characterized in that: It comprises a bone flap fixing body (1) and a fusion body (2); the bone flap fixing body (1) comprises a fixing plate (101), one side of the fixing plate (101) is provided with a raised clamping platform (102), the fixing plate (101) and the clamping platform (102) are connected to form a T-shaped structure, and a plurality of nail placement holes (103) are opened on the fixing plate (101); The fusion body (2) is arranged on a side of the bone flap fixing body (1) having a clamping platform (102) and is arranged in an interlaced manner therewith; the fusion body (2) is provided with a clamping groove (201) matching the shape of the clamping platform (102); the clamping platform (102) is embedded in the clamping groove (201) and is clamped and fixed thereto; and the fusion body (2) is provided with a plurality of bone grafting holes (202).

2. The fusion device for returning and fixing a skull bone flap according to claim 1, characterized in that: The card platform (102) is in a quadrangular pyramid structure; the top surface of the card platform (102) is fixedly connected to the fixed plate (101); the bottom surface of the card platform (102) extends downward and is embedded in the card slot (201) for clamping; and the size of the card platform (102) gradually increases from the top surface to the bottom surface.

3. The fusion device for accommodating and fixing a skull bone flap according to claim 1 or 2, characterized in that: The fusion body (2) comprises a top end surface (203), a bottom end surface (204) and side surfaces (205) on both sides; the card slot (201) is arranged on the top end surface (203) of the fusion body (2) and extends toward the middle to match the shape of the card platform (102).

4. The fusion device for accommodating and fixing a skull bone flap according to claim 3, characterized in that: The side surfaces (205) on both sides of the fusion body (2) are provided with a plurality of grooves (206) that can be bent.

5. The fusion device for accommodating and fixing a skull bone flap according to claim 4, characterized in that: The side surfaces (205) on both sides of the fusion body (2) are in a sawtooth or corrugated structure.

6. The fusion device for accommodating and fixing a skull bone flap according to claim 1 or 2, characterized in that: Extension bodies (3) are also provided at both ends of the fusion body (2), and a plurality of bone grafting through holes (301) are provided on the extension body (3).

7. The fusion device for accommodating and fixing a skull bone flap according to claim 6, characterized in that: The extension body (3) comprises a top wall (302), a bottom wall (303) and side walls (304) on both sides. The side walls (304) on both sides of the extension body (3) are provided with a plurality of concave grooves (305) that can be bent.

8. The fusion device for accommodating and fixing a skull bone flap according to claim 7, characterized in that: The side walls (304) on both sides of the extension body (3) are in a sawtooth or corrugated structure.

9. The fusion device for accommodating and fixing a skull bone flap according to claim 8, characterized in that: The extension body (3) and the fusion body (2) are an integrally formed structure.

10. The fusion device for accommodating and fixing a skull bone flap according to claim 1 or 2, characterized in that: The bone flap fixing body (1) and the fusion body (2) are components made of PEEK material.

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