Fusion cage for restoring and fixing vertebral plate in surgical operation
By designing a fusion device including laminar fixation and fusion, the problem of laminar fixation in spinal spinal surgery is solved, and the solid fixation and bone fusion of laminar plates are achieved to adapt to different forms of laminar plates.
Patent Information
- Application Number
- CN202421758020.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-07-24
AI Technical Summary
The prior art is difficult to effectively fix the laminar in spinal spinal surgery, resulting in postoperative spinal instability, and titanium alloy connecting sheets are difficult to adapt to the morphological differences of laminar plates in different segments.
A fusion device is designed, including a lumbar fixation body and a fusion body, which has an adjustable angle and multiple nail holes, and the fusion body can be stuck to the gap to add an "anchor" point, and PEEK material is used to improve biocompatibility and mechanical characteristics.
The firm fixation of the lamina is achieved, filling the gaps left by the bone knife or milling cutter, promoting bone fusion, reducing the artifacts of postoperative re-examination, and adapting to different forms of laminar plates.
Smart Images
Figure CN222968704U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fusion devices, and particularly relates to a fusion device for reducing and fixing laminae during surgical operations. Background Art
[0002] In spinal and spinal cord surgery, in order to facilitate intraoperative exposure, it is often necessary to use an ultrasonic bone scalpel or a milling cutter to cut both bilateral laminae before performing operations under the laminae (ligamentum flavum, intervertebral disc, dura mater, spinal cord, and spinal nerves). As a posterior column structure of the spine, the lamina plays a very important role in maintaining the stability of the spine. Therefore, after the operation under the lamina is completed, surgeons usually reduce and fix the lamina to reconstruct the integrity of the spine.
[0003] Currently, the reduction and fixation devices most commonly used clinically are titanium alloy two-hole or multi-hole connecting plates. Due to a certain amount of bone loss during the cutting process, there will be a certain gap between the fixed lamina and the remaining lamina of the spine. The width of this gap depends on the size of the tool used for cutting and the size of the surgical field exposure. The width of a single-sided gap is generally 2-3 mm. This gap is finally filled with proliferated fibrous tissue. The reduced lamina is equivalent to being free behind the spine and is difficult to form a bony fusion with the spine, thus affecting the postoperative stability of the spine. In addition, due to the relatively high hardness of the titanium alloy connecting plate, it is difficult to adapt to the morphological differences of laminae at different segments, and it is difficult to fit perfectly with the vertebrae after fixation. Summary 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 reducing and fixing laminae during surgical operations. This fusion device can not only play a fixing role through the lamina fixing body as a nail-setting point, but also increase the "anchoring" points of the lamina by clamping the fusion body in the gap to effectively fix the lamina.
[0005] To achieve the above purpose, a fusion device for reducing and fixing laminae during surgical operations provided by the utility model includes a lamina fixing body and a fusion body; the lamina fixing body includes a first fixing arm and a second fixing arm, and an included angle is formed by the connection of the first fixing arm and the second fixing arm, and the size of the included angle can be adjusted under the action of an external force; a plurality of nail-setting holes are arranged on both the first fixing arm and the second fixing arm; the fusion body is arranged below the lamina fixing body and is arranged staggeredly therewith, and a plurality of bone grafting holes are arranged on the fusion body.
[0006] Further, a first groove for bending is provided at the connection of the first fixing arm and the second fixing arm.
[0007] Further, a plurality of second grooves for bending are arranged on the first fixing arm; a plurality of third grooves for bending are arranged on the second fixing arm.
[0008] Further, the first groove, the second groove and the third groove extend transversely through the side walls on both sides of the lamina fixator.
[0009] Further, the fusion body includes a top end face, a bottom end face and side faces on both sides. The top end face of the fusion body is connected to the bottom of the lamina fixator, and the width of the fusion body gradually decreases from the top end face to the bottom end face.
[0010] Further, the side faces on both sides of the fusion body are in a serrated or corrugated structure.
[0011] Further, the bottom end face of the fusion body is in an arc-shaped structure.
[0012] Further, the fusion body and the lamina fixator are an integrally formed structure made of PEEK material.
[0013] Further, the diameter of the screw hole is 1.5 - 2.5 mm.
[0014] Further, the diameter of the bone grafting hole is 2.5 - 3.5 mm.
[0015] Compared with the prior art, the present utility model has the following advantages:
[0016] First, the fusion device of the present utility model can not only firmly fix the lamina, but also achieve the ultimate goal of filling the gaps left by bone knives or milling cutters and bone fusion. The fusion device of the present utility model uses a non-metallic PEEK material as the raw material of the fusion device. 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.
[0017] Second, the fusion device of the present utility model is composed of a fusion body and a lamina fixator that unfolds in a "V" shape. There are multiple grooves connecting between the fixing arms and inside the fixing arms, which can be used for the reduction and fixation of different-shaped laminae.
[0018] Third, the fusion device of the present utility model uses PEEK (polyetheretherketone) material, and its mechanical characteristics are equivalent to those of the titanium alloy connecting piece. Moreover, it can reduce the artifacts generated by the metal sheet during the postoperative magnetic resonance or CT reexamination of the patient. For patients who need radiotherapy after spinal canal malignant tumor surgery, the PEEK material can reduce the influence of metal materials on radiotherapy rays.
[0019] Fourth, there are 4 or more screw placement points designed on the fusion device of the present utility model, which is more firmly fixed than the traditional two-hole titanium alloy connection table.
[0020] Fifthly, there are three kinds of groove designs on the fusion device of the present utility model, which makes the fusion device easy to bend (0-60°). During the operation, pre-shaping can be carried out according to the shapes of the patient's lamina and spinous process, so that the lamina is closer to the physiological state after reduction.
[0021] Sixthly, the fusion device of the present utility model can adjust the thickness of the fusion structure according to the surgical needs, and the length of the fusion device can also be adjusted by reducing the nail-insertion points, so as to meet the requirements of lamina reduction and fixation in different situations. For example, for children with smaller lamina sizes, 1-2 nail-insertion points can be removed. Or, during the operation, due to the need to remove the diseased part, if more lamina bone is removed and the gap is wider, it can be satisfied by adjusting the depth of the implanted fusion body.
[0022] Seventhly, the existing two-hole connecting piece has weak fixation on the lamina and is prone to displacement. In addition to the nail-insertion points playing a fixing role, the fusion body of the fusion device of the present utility model increases the "anchoring" points of the lamina by being stuck in the gap, effectively fixing the lamina.
[0023] Eighthly, the fusion device of the present utility model can implant autologous or allogeneic bone to fill the bone defect caused by the operation, and better promote the bony fusion of the lamina and the spine. Description of the Drawings
[0024] Figure 1 It is a schematic structural diagram of a fusion device for reducing and fixing the lamina in surgical operations;
[0025] Figure 2 It is a schematic structural diagram of the lamina fixing body;
[0026] Figure 3 It is a schematic structural diagram of the fusion body;
[0027] Figure 4 It is a schematic side view structural diagram of a fusion device for reducing and fixing the lamina in surgical operations;
[0028] Figure 5 It is a schematic structural diagram of the lamina fixing body of a fusion device for reducing and fixing the lamina in surgical operations during fixation;
[0029] Figure 6 For Figure 5 It is a schematic structural diagram of the fusion body of the shown fusion device for reducing and fixing the lamina in surgical operations when being embedded into the gap;
[0030] In the figure: lamina fixing body 1, first fixing arm 101, second fixing arm 102, included angle 103, nail-insertion hole 104, first groove 105, second groove 106, third groove 107, fusion body 2, bone-implanting hole 201, top end face 202, bottom end face 203, side face 204. Detailed Embodiment
[0031] The implementation of the present utility model will be described in detail below in conjunction 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 through the description.
[0032] As Figure 1 shown, a fusion device for reducing and fixing laminae during surgical operations includes a lamina fixing body 1 and a fusion body 2. The fusion body 2 and the lamina fixing body 1 are an integrally formed structure made of PEEK material. Using PEEK material, its mechanical characteristics are equivalent to those of a titanium alloy connecting piece, and it can also reduce the artifacts generated by the metal sheet when the patient undergoes a postoperative magnetic resonance or CT examination. For patients who need radiotherapy after spinal canal malignant tumor surgery, the PEEK material can reduce the influence of the metal material on the radiotherapy rays.
[0033] As Figure 2 shown, the lamina fixing body 1 includes a first fixing arm 101 and a second fixing arm 102. The first fixing arm 101 and the second fixing arm 102 are connected to form an angle 103, and the size of the angle 103 can be adjusted under the action of an external force; a plurality of screw holes 104 are provided on both the first fixing arm 101 and the second fixing arm 102. In this embodiment, the number of screw holes 104 is 4, which is more firmly fixed than the traditional two-hole titanium alloy connecting table. The diameter of the screw hole 104 is 1.5 - 2.5 mm. The connection part of the first fixing arm 101 and the second fixing arm 102 has a first groove 105 that can be bent. A plurality of second grooves 106 that can be bent are provided on the first fixing arm 101; a plurality of third grooves 107 that can be bent are provided on the second fixing arm 102. The first groove 105, the second groove 106, and the third groove 107 extend horizontally through the side walls on both sides of the lamina fixing body 1. In this embodiment, there are three groove designs on the fusion device, so that the fusion device can be easily bent by 0 - 60°, and during the operation, it can be pre-shaped according to the shapes of the patient's laminae and spinous processes, making the laminae closer to the physiological state after reduction.
[0034] As Figure 3As shown in the figure, the fusion body 2 is arranged below the lamina fixation body 1 and staggered with it. A number of bone grafting holes 201 are provided on the fusion body 2, and the diameter of the bone grafting holes 201 is 2.5 - 3.5 mm. The fusion body 2 includes a top end face 202, a bottom end face 203, and side faces 204 on both sides. The bottom end face 203 of the fusion body 2 is in an arc-shaped structure. The top end face 202 of the fusion body 2 is connected to the bottom of the lamina fixation body 1. The width of the fusion body 2 gradually decreases from the top end face 202 to the bottom end face 203. The design of being wider at the top and narrower at the bottom can make the implantation process easier and adapt to surgeries for different people (with different lamina thicknesses and different implantation depths). The side faces 204 on both sides of the fusion body 2 are in a serrated or corrugated structure, and the surface is in a serrated or corrugated design. Such a design can prevent the fusion device from loosening, falling off, and shifting easily after implantation.
[0035] The fusion device of the present utility model can adjust the thickness of the fusion structure according to the surgical requirements, and the length of the fusion device can also be adjusted by reducing the number of screw placement points, so as to meet the requirements of lamina reduction and fixation in different situations. For example, for children with smaller lamina sizes, 1 - 2 screw placement points can be removed. Or, during the operation, due to the need to remove lesions, if a large amount of lamina bone is removed and the gap is wide, it can be met by adjusting the depth of the implanted fusion body. The traditional two-hole connecting piece has weak fixation to the lamina and is prone to displacement. In addition to the screw placement points playing a fixation role, the fusion device of the present utility model increases the "anchoring" points of the lamina by clamping the fusion body in the gap, effectively fixing the lamina, as Figures 4 - 6 shown. The fusion device of the present utility model can implant autologous or allogeneic bone to fill the bone defect caused by the surgery and better promote the bony fusion of the lamina and the spine.
[0036] The above is only the specific implementation manner of the present utility model. It should be noted that any changes or substitutions that can be easily thought of 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 reducing and fixing vertebral plates in surgical operations, characterized in that: The invention comprises a vertebral plate fixing body (1) and a fusion body (2); the vertebral plate fixing body (1) comprises a first fixing arm (101) and a second fixing arm (102); the first fixing arm (101) and the second fixing arm (102) are connected to form an angle (103); the angle (103) can be adjusted under the action of an external force; the first fixing arm (101) and the second fixing arm (102) are both provided with a plurality of screw holes (104); the fusion body (2) is arranged below the vertebral plate fixing body (1) and is arranged in an alternating manner therewith; the fusion body (2) is provided with a plurality of bone grafting holes (201).
2. The fusion device for reducing and fixing vertebral plates in surgical operations according to claim 1, characterized in that: A first groove (105) capable of being bent is provided at the connection between the first fixing arm (101) and the second fixing arm (102).
3. The fusion device for reducing and fixing vertebral plates in surgical operations according to claim 2, characterized in that: The first fixed arm (101) is provided with a plurality of second grooves (106) that can be bent; and the second fixed arm (102) is provided with a plurality of third grooves (107) that can be bent.
4. The fusion device for reducing and fixing vertebral plates in surgical operations according to claim 3, characterized in that: The first groove (105), the second groove (106) and the third groove (107) extend transversely through the side walls on both sides of the vertebral plate fixing body (1).
5. The fusion device for reducing and fixing vertebral plates in surgical operations according to any one of claims 1 to 4, characterized in that: The fusion body (2) comprises a top end surface (202), a bottom end surface (203) and side surfaces (204) on both sides; the top end surface (202) of the fusion body (2) is connected to the bottom of the vertebral plate fixation body (1); and the width of the fusion body (2) gradually decreases from the top end surface (202) to the bottom end surface (203).
6. The fusion device for reducing and fixing vertebral plates in surgical operations according to claim 5, characterized in that: The side surfaces (204) on both sides of the fusion body (2) are in a sawtooth or corrugated structure.
7. The fusion device for reducing and fixing vertebral plates in surgical operations according to claim 5, characterized in that: The bottom end surface (203) of the fusion body (2) is in an arc-shaped structure.
8. The fusion device for reducing and fixing vertebral plates in surgical operations according to any one of claims 1 to 4, characterized in that: The fusion body (2) and the vertebral plate fixing body (1) are an integrally formed structure made of PEEK material.
9. The fusion device for reducing and fixing vertebral plates in surgical operations according to any one of claims 1 to 4, characterized in that: The diameter of the nail placement hole (104) is 1.5-2.5 mm.
10. The fusion device for reducing and fixing vertebral plates in surgical operations according to any one of claims 1 to 4, characterized in that: The diameter of the bone graft hole (201) is 2.5-3.5 mm.