A fusion door fixation device and spinal internal fixation system

Abstract

The present invention provides a fusion door fixation device and spinal internal fixation system, comprising a fixation plate body and an optional fusion plate; the fixation plate body comprises an upper fixation plate for fixing the upper lamina at the lamina door, a lamina door support plate for supporting, and a lower fixation plate for fixing the lower lamina at the lamina door, which are connected in sequence. The lower fixation plate is provided with a second fusion hole, in which a second fusion screw is provided. The second fusion screw passes through the vertebral body at the current level and is fixed to the vertebral body at the next level; the fusion plate is fixed to the vertebral body at the current level and is located on the opposite side of the lower fixation plate. The fusion plate is provided with a first fusion hole, in which a first fusion screw is provided. The first fusion screw passes through the vertebral body at the current level and is fixed to the vertebral body at the next level. The fusion screw is used to fix the lamina to the lamina at the next level, thereby achieving rigid fixation between the facet joints while maintaining stable support, providing favorable conditions for fusion between the vertebral bodies.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a fusion door fixation device and a spinal internal fixation system. Background Art

[0002] Fusion open-door titanium plates are often used for fixation to treat symptoms of cervical spinal stenosis or multi-segmental cervical spondylotic myelopathy. The advantage of fusion open-door titanium plate fixation is that a stable bridging structure can be formed between the lifted vertebral plate and the ipsilateral lateral mass through the fixation plate body, which can form a rigid support on the open-door side. After surgery, the spinal structure can be maintained in a fixed position during surgery, achieving immediate stability. Fusion open-door titanium plates can also improve the stability of the portal axis side, which is beneficial to bone healing on the portal axis side and prevents further loss of the physiological curvature of the cervical spine. However, after a large number of surgical practices, the existing fusion open-door titanium plate structure has the problems of poor fusion stability and insufficient fit to the vertebral arch plate. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a fusion door-opening fixation device and a spinal internal fixation system. The fusion door-opening fixation device and the spinal internal fixation system form a stable bridging structure between the lifted vertebral plate and the ipsilateral lateral mass, which can form a real rigid support on the door-opening side, maintain the consistency of the spinal structure position during and after surgery, achieve immediate stability, and effectively prevent the door from closing again or the door opening angle from decreasing after surgery; while maintaining stable support, rigid fixation between small joints is achieved, providing favorable conditions for intervertebral fusion.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A fusion door fixing device includes a fixing plate body and an optional fusion plate;

[0006] The fixation plate body includes an upper fixation plate for fixing the upper lamina at the lamina opening, a lamina opening support plate for supporting, and a lower fixation plate for fixing the lower lamina at the lamina opening, which are connected in sequence. The lower fixation plate is provided with a second fusion hole, in which a second fusion screw is provided. The second fusion screw passes through the vertebral body at the current level and is fixed to the vertebral body at the next level.

[0007] The fusion plate is fixed to the vertebral body at the same level and is located on the opposite side of the lower fixation plate with respect to the spinous process. The fusion plate is provided with a first fusion hole. A first fusion screw is provided in the first fusion hole. The first fusion screw passes through the vertebral body at the same level and is fixed to the vertebral body at the next level.

[0008] Furthermore, the fusion plate is provided with one or more first fusion holes.

[0009] Furthermore, the lower fixing plate is further provided with one or more second through holes, and second lamina screws for fixing the lower lamina at the lamina opening are provided in the second through holes.

[0010] Furthermore, the lower fixation plate is provided with one or more second fusion holes near the next vertebral body, and the center lines of the second fusion holes are inclined 50°-80° relative to the vertical line or the lower fixation plate is bent 20°-40°.

[0011] Preferably, the plurality of second fusion holes are arranged side by side laterally.

[0012] Furthermore, the upper fixing plate is provided with one or more first through holes, and first lamina screws for fixing the upper lamina at the lamina opening are provided in the first through holes.

[0013] Furthermore, the lower end surfaces of the screw heads of the first lamina screw and the second lamina screw are both spherical structures, and the first through hole and the second through hole are both spherical groove structures that match the spherical structures;

[0014] And / or, both the first through hole and the second through hole are countersunk holes without internal threads.

[0015] Furthermore, a second support leg is provided on the inner side of the connection between the vertebral plate door support plate and the lower fixing plate, and the angle between the second support leg and the lower fixing plate is a right angle or an obtuse angle, preferably 90°-120°.

[0016] Furthermore, the lamina door support plate is an arc-shaped plate; preferably, the lamina door support plate includes a vertical arc-shaped plate and a horizontal arc-shaped plate, and the upper fixing plate, the vertical arc-shaped plate, the horizontal arc-shaped plate and the lower fixing plate are connected in sequence;

[0017] A first support leg is provided on the inner side of the connection between the upper fixing plate and the vertical curved plate, and the upper fixing plate, the vertical curved plate and the first support leg form a slot for accommodating the open end of the upper vertebral plate at the vertebral plate opening;

[0018] A second support leg is provided inside the connection between the transverse arc plate and the lower fixed plate, and the connection end between the transverse arc plate and the vertical arc plate is higher than the connection end between the transverse arc plate and the lower fixed plate.

[0019] Furthermore, the upper fixing plate, the vertical curved plate, the horizontal curved plate and the lower fixing plate are made of titanium alloy or pure titanium.

[0020] Preferably, the thickness of the upper fixing plate, the vertical curved plate, the transverse curved plate and the lower fixing plate are independently 0.4-1.0 mm.

[0021] Preferably, the radius of the transverse arc-shaped plate is 5-13.5 mm.

[0022] Preferably, the vertical arc plate is in the shape of an elliptical arc that bulges downward toward the fixed plate side.

[0023] Preferably, the radius of the vertical curved plate is 2.5-5 mm.

[0024] Preferably, the transverse length of the first support leg is 0.5-2.0 mm.

[0025] Preferably, the vertical arc plate and the transverse arc plate are tangentially connected, and / or the height difference between the first support leg and the lower fixed plate is 3-7 mm, and / or more than two transverse steps are provided on the inner side of the slot.

[0026] The present invention also provides a spinal internal fixation system, which includes at least two fusion open-door fixation devices as described above.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The fusion door-opening fixation device provided by the present invention uses fusion screws to achieve fixation between the vertebral body at the current level and the vertebral body at the next level. A fusion plate can be optionally used to further enhance fusion fixation, and can form a stable bridge structure between the lifted vertebral plate and the ipsilateral lateral mass. It can form a real rigid support on the door-opening side, maintain the consistency of the spinal structure position during and after surgery, achieve immediate stability, and effectively prevent re-closing of the door or reduction of the door-opening angle after surgery. While maintaining stable support, it achieves rigid fixation between the facet joints (the facet joints formed between the vertebral body at the current level and the vertebral body at the next level), providing favorable conditions for fusion and adhesion therebetween. The device is suitable for the treatment of symptoms of cervical spinal stenosis or multi-segmental cervical spondylotic myelopathy, and is particularly suitable for fixation of the C6 and C7 segments of the spine.

[0029] The fusion door fixing device provided by the present invention has a second support leg supporting position at a certain angle to the lower fixing plate, which can better match the cut-off door side vertebral plate section and provide a more secure support.

[0030] The fusion door fixation device provided by the present invention has an upper fixation plate and / or a lower fixation plate that adopts a double-row spherical groove structure that matches the spherical structure at the lower end of the screw head of the lamina screw, so that the fixation plate body can be more stably fixed to the lamina, forming a low-profile connection and reducing irritation of surrounding tissues.

[0031] The fusion door fixing device provided by the present invention has a vertical curved plate provided between the upper fixing plate and the first support leg. By providing vertical curved plates of different heights, it can be adapted to different cervical vertebrae segments of different populations. At the same time, the vertical curved plate adopts an arc-shaped structure, which can effectively reduce stress concentration and lower postoperative risks while reducing the space occupied by the vertebral plate.

[0032] The transverse arc plate provided in the fusion door fixing device provided by the present invention can form a smooth arc transition connection with the cervical vertebra after being fixed, and is slightly convex upward, thereby increasing the area of the spinal canal door while ensuring the door strength;

[0033] The fusion door opening fixing device provided by the present invention is easy to shape, can be set in various specifications, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of a fused door fixing plate provided in Example 1 of the present invention;

[0035] Figure 2 Schematic diagram of the structure of the spherical groove provided in Example 1 of the present invention;

[0036] Figure 3 is a schematic structural diagram of a double-hole fusion plate provided in Example 1 of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of the fusion door fixing plate provided in Example 1 of the present invention;

[0038] Figure 5 This is a schematic structural diagram of a fused door fixing plate provided in Example 2 of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure of the fusion door fixing plate provided in Example 2 of the present invention;

[0040] Figure 7 This is a schematic structural diagram of a fused door fixing plate provided in Example 3 of the present invention;

[0041] Figure 8 for Figure 7 Schematic diagram of the improved structure of the inner side of the slot formed by the upper middle fixing plate, the vertical curved plate and the first supporting leg;

[0042] Figure 9 This is a schematic diagram of the usage structure of the fused door opening fixing plate provided in Example 3 of the present invention.

[0043] in:

[0044] 1. Fixing plate body;

[0045] 11. Upper fixation plate; 111. Spherical groove; 112. First lamina screw; 113. First through hole; 12. Vertical curved plate; 13. Horizontal curved plate; 14. Lower fixation plate; 141. Second fusion screw; 142. Second lamina screw; 143. Second through hole; 144. Second fusion hole; 15. First support leg; 16. Second support leg; 17. Slot; 171. Step;

[0046] 2. Fusion plate; 21. First fusion screw; 22. First fusion hole;

[0047] 3. Upper lamina on the door opening side;

[0048] 4. Lower vertebral plate on the door opening side;

[0049] 5. The next vertebral body;

[0050] 6. Vertebrae at this level;

[0051] 7. Spinous process;

[0052] H is the distance between the first support leg and the lower fixed plate;

[0053] α is the angle between the second support leg and the lower fixing plate. DETAILED DESCRIPTION

[0054] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0055] In the description of the present invention, it should be understood that the terms "center", "vertical", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0056] In the description of the present invention, the inner side refers to the position where the fixation plate body is close to or contacts the upper vertebral plate or the lower vertebral plate on the side of the vertebral plate opening.

[0057] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0058] The present invention provides a fusion door fixing device, comprising a fixing plate body and an optional fusion plate;

[0059] The fixation plate body includes an upper fixation plate for fixing the upper lamina at the lamina opening, a lamina opening support plate for supporting, and a lower fixation plate for fixing the lower lamina at the lamina opening, which are connected in sequence. The lower fixation plate is provided with a second fusion hole, in which a second fusion screw is provided. The second fusion screw passes through the vertebral body at the current level and is fixed to the vertebral body at the next level.

[0060] The fusion plate is fixed to the vertebral body at the same level and is located on the opposite side of the lower fixation plate with respect to the spinous process. The fusion plate is provided with a first fusion hole. A first fusion screw is provided in the first fusion hole. The first fusion screw passes through the vertebral body at the same level and is fixed to the vertebral body at the next level.

[0061] The fusion open-door fixation device can be used to treat symptoms of cervical spinal stenosis or multi-segmental cervical spondylotic myelopathy. In the treatment of the above-mentioned diseases, fixation is targeted at the C6 and C7 segments because C6 and C7 are the vertebrae that transition from the cervical spine to the thoracic spine. Their morphological characteristics are significantly different from those of C3-C5. The lateral masses of C6 and C7 are relatively thinner and longer. The use of lateral mass screws for fixation in this segment has poor stability, especially in patients with osteoporosis. Neck flexion movement can easily loosen and pull out the tail screws of the lateral mass nail plate. The fusion open-door fixation device is particularly suitable for fixation of the C6 and C7 segments of the spine.

[0062] The main feature of the fusion door-opening fixation device is that it can form a stable bridging structure between the lifted vertebral plate and the ipsilateral lateral mass, and can form a real rigid support on the door-opening side, maintaining the consistency of the spinal structure position during and after the operation, achieving immediate stability, and effectively preventing the door from closing again or reducing the door opening angle after surgery; while maintaining stable support, it achieves rigid fixation between small joints, providing favorable conditions for fusion between them.

[0063] The fusion plate and the lower fixation plate in the fusion open-door fixation device can be respectively placed at the vertebral arch plates on both sides of the spinous process. Preferably, the first fusion screw and the second fusion screw independently fix the same side of the current level vertebral body and the next level vertebral body.

[0064] The fusion plate can be used in conjunction with the fixing plate body as needed to achieve the purpose of further fusion. The fusion plate is provided with one or more first fusion holes, preferably two first fusion holes arranged side by side.

[0065] Furthermore, the lower fixation plate is also provided with one or more second through holes, and a second lamina screw is provided in the second through hole for fixing the lower lamina at the lamina opening. The number of second through holes provided on the lower fixation plate can be 1, 2 or 3, etc., and the number of second through holes can be determined according to the bone condition of the fixed position.

[0066] The lower fixation plate is provided with one or more second fusion holes near the next vertebral body, such as 2, 3 or 4 second fusion holes. The number of second fusion holes can be selected according to the fixation needs, and generally 1 or 2 can be provided side by side horizontally. In order to ensure that the lower fixation plate fits the vertebral plate and can be fixed to the next vertebral arch plate after being fixed by the second fusion screw, the centerline of the second fusion hole is tilted 50°-80° relative to the vertical line (i.e., the first fusion hole is tilted), such as 55°, 60°, 65°, 70°, 72° or 78°, or the lower fixation plate is bent 20°-40° (such as the plate body between the second through hole and the second fusion hole is bent by sheet metal bending, etc.), such as 22°, 25°, 28°, 30°, 35° or 37°. The lower fixation plate provided with the second through hole and the second fusion hole can be an anatomical plate, a corner plate or a bent plate.

[0067] Furthermore, the upper fixation plate is provided with one or more first through holes, wherein first lamina screws for fixing the upper lamina at the lamina opening are provided in the first through holes. The number of the first through holes can be 1, 2, or 3, etc., and the number of the first through holes can be determined according to the bone condition of the fixation position.

[0068] In actual production, the fixing plate body with different numbers of first through holes, second through holes or second fusion holes can be processed, and a more appropriate fixing plate body can be selected according to needs during use.

[0069] Furthermore, in order to achieve a firm fixation of the fixation plate body and the bone by the first lamina screw and the second lamina screw, so that the plate body is more stably fixed to the lamina, the lower end surfaces of the screw heads of the first lamina screw and the second lamina screw are both spherical structures, and the first through hole and the second through hole are both spherical groove structures that match the spherical structures;

[0070] And / or, the first through hole and the second through hole are both countersunk holes without internal threads, and fixation is completed with the vertebral body by the vertebral lamina screws, which can further reduce stress concentration; the first through hole and the second through hole are both countersunk holes, so that the heads of the first vertebral lamina screws and the second vertebral lamina screws do not protrude from the upper surfaces of the two fixation plates when embedded in the two fixation plates, and will not cause compression and irritation to the human tissue above the two fixation plates.

[0071] Furthermore, in order to increase the area of the vertebral plate opening while ensuring the strength of the fixing plate body, the vertebral plate opening support plate is an arc-shaped plate; in addition, in order to better cooperate with the lower vertebral plate at the vertebral plate opening and provide stronger support, a second support foot is provided on the inner side of the connection between the vertebral plate opening support plate and the lower fixing plate, and the angle between the second support foot and the lower fixing plate is a right angle or an obtuse angle, preferably 90°-120°, such as 95°, 100°, 110° or 115°, etc.

[0072] Furthermore, the lamina door support plate includes a vertical arc plate and a horizontal arc plate, and the upper fixing plate, the vertical arc plate, the horizontal arc plate and the lower fixing plate are connected in sequence;

[0073] A first support leg is provided on the inner side of the connection between the upper fixing plate and the vertical curved plate, and the upper fixing plate, the vertical curved plate and the first support leg form a slot for accommodating the open end of the upper vertebral plate at the vertebral plate opening;

[0074] A second support leg is provided inside the connection between the transverse arc plate and the lower fixed plate, and the connection end between the transverse arc plate and the vertical arc plate is higher than the connection end between the transverse arc plate and the lower fixed plate.

[0075] The vertical curved plate can be selected in different heights according to different cervical segments of different populations, and its height is between 4-8mm, such as 5mm, 6mm or 7mm; the vertical curved plate is an elliptical arc with a convex downward fixed plate side; the radius of the vertical curved plate is 2.5-5mm, such as 2.8mm, 3.5mm, 4.0 mm, 4.2mm or 4.7mm; the setting of the vertical curved plate can reduce the space occupied by the vertebral plate while effectively reducing stress concentration and reducing postoperative risks.

[0076] The radius of the transverse arc plate is 5-13.5 mm, such as 5.6 mm, 6.8 mm, 7.5 mm, 8.0 mm, 9.0 mm, 10.2 mm or 12.5 mm. Its gentle arc design and slight upward bulge increase the area of the spinal canal opening while ensuring the strength of the titanium plate for the opening.

[0077] The shape and structure of the fixed plate body are not limited to the above structure. It can be a door opening fixed plate of any structure, such as the fixed plate body includes an upper fixed plate, an arc-shaped plate and a lower fixed plate, and a first support leg is provided at the middle of the arc-shaped plate or at the connection between the arc-shaped plate and the upper fixed plate, and a second support leg is provided at the connection between the arc-shaped plate and the lower fixed plate; or the fixed plate body includes an upper fixed plate, a straight plate and a lower fixed plate, and a first support leg is provided at the connection end of the upper fixed plate and the straight plate, etc.

[0078] Furthermore, in order to achieve better shaping during the operation, the upper fixation plate, vertical arc plate, horizontal arc plate and lower fixation plate are made of titanium alloy, and the thickness is independently 0.4-1.0 mm, such as 0.5 mm, 0.7 mm, 0.8 mm or 0.9 mm.

[0079] Preferably, the transverse length of the first support leg is 0.5-2.0 mm, such as 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm or 1.7 mm, etc. This length is relatively short and can be accurately stuck on the end surface of the upper vertebral plate to avoid accidental jamming of surrounding tissues during surgery.

[0080] Preferably, the vertical arc-shaped plate and the transverse arc-shaped plate are tangentially connected, in which case the strength of the fixing plate body is optimal.

[0081] Preferably, the height difference H between the first support leg and the lower fixing plate is 3-7 mm, such as 4 mm, 5 mm, 6 mm or 6.5 mm, so as to expand the application range of the posterior cervical vertebrae opening plate, be applicable to different cervical vertebrae segments of different populations, be more suitable for physiological and anatomical structures, and increase the area of the spinal canal opening;

[0082] Preferably, two or more transverse steps are provided on the inner side of the slot to prevent the upper vertebral plate on the vertebral plate door opening side from shaking in the slot.

[0083] The present invention also provides a spinal internal fixation system, which includes at least two fusion open-door fixation devices as described above, such as 2, 3 or 4 fusion open-door fixation devices.

[0084] The method for using the fusion door opening fixing device includes:

[0085] First, cut open one side of the spinal vertebral lamina, and optionally cut a "V"-shaped groove on the opposite side to facilitate the expansion of the lamina to form an "open door"; then place the upper fixation plate of the fixation plate body on the upper lamina on the incision side, so that the first support leg supports the upper lamina and place the lower fixation plate on the lower lamina on the incision side, so that the second support leg supports the lower lamina, then implant the second fusion screw in the second fusion hole, and finally screw the first lamina screw and the second lamina screw into the first through hole of the upper fixation plate and the second through hole of the lower fixation plate respectively; optionally, implant a fusion plate on the opposite side of the fixed position of the lower fixation plate, and implant the first fusion screw in the first fusion hole to complete the installation.

[0086] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0087] Example 1

[0088] like Figure 1-3 As shown, this embodiment provides a fusion door fixing device, comprising a fixed plate body 1, which is a monolithic structure. The fixed plate body 1 comprises an upper fixed plate 11, a vertical curved plate 12, a transverse curved plate 13, and a lower fixed plate 14, which are sequentially connected. A first support leg 15 is provided at the connection between the vertical curved plate 12 and the transverse curved plate 13, and a second support leg 16 is provided at the connection between the transverse curved plate 13 and the lower fixed plate 14. The vertical curved plate 12 can have different height specifications between 4 and 8 mm.

[0089] The fixing plate body 1 can be made of pure titanium or titanium alloy, and the thickness is between 0.4-1.0 mm.

[0090] The lower fixation plate 14 is provided with a second fusion screw 141 , which passes through the vertebral lamina of the current vertebral body 6 and is fixed to the vertebral lamina of the next vertebral body 5 .

[0091] The screw hole on the lower fixing plate 14 for installing the second fusion screw 141 is vertically inclined by 50°-80°, thereby achieving an angle tilt of the second fusion screw 141 and achieving the purpose of fixing the facet joint.

[0092] The lower fixing plate 14 can be a straight plate, a bent plate or a corner plate, and those skilled in the art can design it according to actual needs.

[0093] The lower fixation plate 14 also has a second through hole 143 for connecting to the vertebral lamina. A second lamina screw 142 is disposed in the second through hole 143. The second lamina screw 142 is disposed on the side of the second fusion screw 141 away from the lamina of the next vertebral body 5. The lower fixation plate 14 can be provided with one, two, or three second lamina screws 142. Multiple second lamina screws 142 can be arranged side by side, either approximately horizontally or vertically. To prevent interference between the second lamina screws 142 and the second fusion screws 141, the multiple second lamina screws 142 are preferably arranged approximately vertically. In this embodiment, the lower fixation plate 14 is provided with one second lamina screw 142.

[0094] The vertical arc plate 12 is in the shape of an elliptical arc that protrudes toward the lower fixed plate 14 , and the radius of the vertical arc plate is 2.5-5 mm.

[0095] The transverse length of the first support leg 15 is 0.5-2.0 mm; the height difference H between the first support leg 15 and the lower fixing plate 14 is 3-7 mm.

[0096] The transverse arc-shaped plate 13 is in an upwardly convex arc shape, and the radius of the transverse arc-shaped plate 13 is 5-13.5 mm, and the curvature is designed to be relatively gentle.

[0097] An included angle α between the second support leg 16 and the lower fixing plate 14 is 90°-120°.

[0098] The upper fixation plate 11 is provided with a double row of spherical grooves 111 for receiving first lamina screws 112. The spherical grooves 111 cooperate with the spherical structure at the lower end of the screw head of the first lamina screw 112. Optionally, the structure for receiving the second lamina screw 142 on the lower fixation plate 14 can be the same as the mounting structure for receiving the first lamina screw 112 on the upper fixation plate 11.

[0099] The method of using the fusion door fixing plate of this embodiment is as follows: Figure 4 As shown:

[0100] The upper fixation plate 11 uses the first lamina screw 112 to fix the upper lamina 3 on the door opening side, and the lower fixation plate 14 uses the second lamina screw 142 to fix the lower lamina 4 on the door opening side. The lower fixation plate 14 uses the second fusion screw 141 to pass through the lamina of the current level vertebral body 6 and fix it to the lamina of the next level vertebral body 5 to complete the installation.

[0101] Example 2

[0102] like Figure 5 As shown, this embodiment provides a fusion door fixing plate, comprising a fixing plate body 1, which is a monolithic structure. The fixing plate body 1 comprises an upper fixing plate 11, a vertical curved plate 12, a transverse curved plate 13, and a lower fixing plate 14, which are sequentially connected. A first support leg 15 is provided at the connection between the vertical curved plate 12 and the transverse curved plate 13, and a second support leg 16 is provided at the connection between the transverse curved plate 13 and the lower fixing plate 14. The vertical curved plate 12 has different height specifications ranging from 4 to 8 mm.

[0103] The fixing plate body 1 can be made of titanium alloy or pure titanium, and the thickness is between 0.4-1.0 mm.

[0104] The lower fixation plate 14 is provided with a second fusion screw 141 , which passes through the vertebral lamina of the current vertebral body 6 and is fixed to the vertebral lamina of the next vertebral body 5 .

[0105] The lower fixation plate 14 on which the second fusion screw 141 is installed is bent 20°-40° (the plate body between the second through hole and the second fusion hole is bent 20°-40°), thereby achieving an angle tilt of the second fusion screw 141 and achieving the purpose of fixing it with the next level of vertebral arch plate.

[0106] The lower fixation plate 14 is also provided with a second lamina screw 142 for connecting the vertebral lamina. The second lamina screw 142 is located on the side of the second fusion screw 141 away from the lamina of the next vertebral body 5. The lower fixation plate 14 can be provided with one, two, or three second lamina screws 142. Multiple second lamina screws 142 can be arranged side by side, either approximately horizontally or vertically. To prevent interference between the second lamina screws 142 and the second fusion screws 141, the multiple second lamina screws 142 are preferably arranged approximately vertically. In this embodiment, the lower fixation plate 14 is provided with two second lamina screws 142, which are arranged approximately vertically side by side.

[0107] The vertical arc plate 12 is in the shape of an elliptical arc that protrudes toward the lower fixed plate 14 , and the radius of the vertical arc plate is 2.5-5 mm.

[0108] The transverse length of the first support leg 15 is 0.5-2.0 mm; the height difference H between the first support leg 15 and the lower fixing plate 14 is 3-7 mm.

[0109] The upper fixing plate, the vertical arc plate and the first support leg form a slot 17 for accommodating the upper vertebral plate on the door opening side.

[0110] The transverse arc-shaped plate 13 is in an upwardly convex arc shape, and the radius of the transverse arc-shaped plate 13 is 5-13.5 mm, and the curvature is designed to be relatively gentle.

[0111] An included angle α between the second support leg 16 and the lower fixing plate 14 is 90°-120°.

[0112] The upper fixation plate 11 is provided with a double row of spherical grooves 111 for receiving first lamina screws 112. The spherical grooves 111 cooperate with the spherical structure at the lower end of the screw head of the first lamina screw 112. Optionally, the structure for receiving the first lamina screw 112 on the lower fixation plate 14 can be the same as the structure for receiving the first lamina screw 112 on the upper fixation plate 11.

[0113] The method of using the fusion door fixing plate of this embodiment is as follows: Figure 6 As shown:

[0114] The upper fixation plate 11 uses the first lamina screw 112 to fix the upper lamina 3 on the door opening side, and the lower fixation plate 14 uses the second lamina screw 142 to fix the lower lamina 4 on the door opening side. The lower fixation plate 14 uses the second fusion screw 141 to pass through the lamina of the current level vertebral body 6 and fix it to the lamina of the next level vertebral body 5 to complete the installation.

[0115] The fusion door opening fixing plate of this embodiment can be used in conjunction with the fusion door opening fixing plate of Example 1.

[0116] Example 3

[0117] like Figure 7 and Figure 8 As shown, this embodiment provides a fusion door fixing device, including a fixing plate body 1 and a fusion plate 2. The fixing plate body 1 is an integral structure and can be used with the fusion plate 2 on the opposite side for fusion reinforcement. The fusion plate 2 can be a double-hole fusion plate, which is provided with two first fusion holes 22 arranged side by side. The first fusion holes 22 are used in conjunction with the first fusion screws 21. The fixing plate body 1 includes an upper fixing plate 11, a vertical curved plate 12, a horizontal curved plate 13 and a lower fixing plate 14 connected in sequence. The first support leg 15 is provided at the connection between the vertical curved plate 12 and the horizontal curved plate 13, and the second support leg 16 is provided at the connection between the horizontal curved plate 13 and the lower fixing plate 14. The different height specifications of the vertical curved plate 12 are between 4-8 mm.

[0118] The fixing plate body 1 can be made of titanium alloy or pure titanium, and the thickness is between 0.4-1.0 mm.

[0119] The lower fixation plate 14 is provided with a second fusion screw 141 , which passes through the vertebral lamina of the current vertebral body 6 and is fixed to the vertebral lamina of the next vertebral body 5 .

[0120] The lower fixation plate 14 is provided with a plurality of second fusion screws 141 mounted side by side. The center lines of the second through holes 143 for mounting the second fusion screws 141 are vertically inclined at 50°-80°. Two, three, or four second fusion screws 141 may be mounted side by side on the lower fixation plate 14, thereby achieving an angled angle for the second fusion screws 141 and securing the lower vertebral body 5 to the superior vertebral plate. Alternatively, the plurality of second fusion screws 141 may be arranged approximately side by side in a transverse direction, allowing each of the plurality of second fusion screws 141 to pass through the vertebral lamina and be secured to the vertebral lamina of the inferior vertebral body 5. In this embodiment, the lower fixation plate 14 preferably has two second fusion screws 141 mounted approximately side by side in a transverse direction.

[0121] The lower fixation plate 14 is also provided with a first lamina screw 112 for connecting the vertebral lamina. The first lamina screw 112 is located on the side of the second fusion screw 141 away from the lamina of the next vertebral body 5. The lower fixation plate 14 can be provided with one, two, or three second lamina screws 142. Multiple second lamina screws 142 can be arranged side by side, either approximately horizontally or vertically. To prevent interference between the second lamina screws 142 and the second fusion screws 141, the multiple second lamina screws 142 are preferably arranged approximately vertically. In this embodiment, the lower fixation plate 14 is provided with two second lamina screws 142, which are arranged approximately vertically side by side.

[0122] The vertical arc plate 12 is in the shape of an elliptical arc that protrudes toward the lower fixed plate 14 , and the radius of the vertical arc plate 12 is 2.5-5 mm.

[0123] The transverse length of the first support leg 15 is 0.5-2.0 mm; the height difference H between the first support leg 15 and the lower fixing plate 14 is 3-7 mm.

[0124] The upper fixing plate 14, the vertical curved plate 12 and the first leg 15 form a slot 17. The inner side of the slot 17 (that is, the inner side of the vertical curved plate 12) may be provided with two or more horizontal steps 171 ( Figure 8 ), which can better prevent the open end of the vertebral plate 3 on the door opening side from shaking vertically in the slot 17.

[0125] The transverse arc-shaped plate 13 is in an upwardly convex arc shape, and the radius of the transverse arc-shaped plate 13 is 5-13.5 mm, and the curvature is designed to be relatively gentle.

[0126] An included angle α between the second support leg 16 and the lower fixing plate 14 is 90°-120°.

[0127] The upper fixation plate 11 is provided with a double row of spherical grooves 111 for receiving first lamina screws 112. The spherical grooves 111 cooperate with the spherical structure at the lower end of the screw head of the first lamina screw 112. Optionally, the structure for receiving the second lamina screw 142 on the lower fixation plate 14 can be the same as the mounting structure for receiving the first lamina screw 112 on the upper fixation plate 11.

[0128] The method of using the fusion door fixing plate of this embodiment is as follows: Figure 9 As shown:

[0129] The upper fixation plate 11 uses the first vertebral plate screw 112 to fix the upper vertebral plate 3 on the door opening side, and the lower fixation plate 14 uses the second vertebral plate screw 142 to fix the lower vertebral plate 4 on the door opening side. The lower fixation plate 14 uses the second fusion screw 141 to pass through the vertebral arch lamina of the current level vertebra and fix it to the vertebral arch lamina 5 of the next level vertebra; the fusion plate 2 is implanted on the opposite side of the fixed position of the lower fixation plate 14, and the first fusion screw 21 is implanted in the first fusion hole 22. The first fusion screw passes through the vertebral arch lamina of the current level vertebra and is fixed to the vertebral arch lamina of the next level vertebra to complete the installation.

[0130] Example 4

[0131] A spinal fixation system, such as Figure 9 As shown, it includes 3 fusion door opening fixing devices described in Example 3.

[0132] In summary, the fusion door-opening fixation device provided by the present invention uses fusion screws to achieve fixation of the vertebral body at the current level and the vertebral body at the next level. A fusion plate can be optionally used to further enhance fusion fixation, and can form a stable bridge structure between the lifted vertebral plate and the ipsilateral lateral mass. It can form a real rigid support on the door-opening side, maintain the consistency of the spinal structure position during and after the operation, achieve immediate stability, and effectively prevent the door from closing again or reducing the door opening angle after the operation; while maintaining stable support, it achieves rigid fixation between small joints, providing favorable conditions for fusion and adhesion therebetween; it is suitable for the treatment of cervical spinal stenosis symptoms or multi-segmental cervical spondylotic myelopathy, and is particularly suitable for fixation of the C6 and C7 segments of the spine;

[0133] The second support leg forms a certain angle with the lower fixed plate, which can better match the cut-off vertebral plate section on the door opening side, providing a more secure support.

[0134] The upper and / or lower fixation plates adopt a double-row spherical groove structure that matches the spherical structure of the lower end of the screw head of the lamina screw, which can make the fixation plate body more stably fixed to the lamina, form a low-profile connection, and reduce irritation of surrounding tissues;

[0135] A vertical curved plate is provided between the upper fixation plate and the first support leg. By setting vertical curved plates of different heights, it can be adapted to different cervical segments of different people. At the same time, the vertical curved plate adopts an arc structure, which can effectively reduce stress concentration and lower postoperative risks while reducing the space occupied by the vertebral plate.

[0136] The fusion door fixing device is equipped with a transverse arc plate, which forms a smooth arc transition link after being fixed with the cervical vertebra and is slightly convex upwards. Under the premise of ensuring the door opening strength, the area of the spinal canal door is increased;

[0137] The integrated door opening fixture is easy to shape and can be set in various specifications, with a wide range of applications.

[0138] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A fusion door fixing device, characterized by: Includes a fixation plate body and an optional fusion plate; The fixation plate body includes an upper fixation plate for fixing the upper lamina at the lamina opening, a lamina opening support plate for supporting, and a lower fixation plate for fixing the lower lamina at the lamina opening, which are connected in sequence. The lower fixation plate is provided with a second fusion hole, in which a second fusion screw is provided. The second fusion screw passes through the vertebral body at the current level and is fixed to the vertebral body at the next level. The fusion plate is fixed to the vertebral body at the same level and is located on the opposite side of the lower fixation plate. The fusion plate is provided with a first fusion hole. A first fusion screw is provided in the first fusion hole. The first fusion screw passes through the vertebral body at the same level and is fixed to the vertebral body at the next level. The fusion plate is provided with one or more first fusion holes; The vertebral plate door support plate is an arc-shaped plate; The lamina door support plate includes a vertical arc plate and a horizontal arc plate, and the upper fixing plate, the vertical arc plate, the horizontal arc plate and the lower fixing plate are connected in sequence; A first support leg is provided on the inner side of the connection between the upper fixing plate and the vertical curved plate, and the upper fixing plate, the vertical curved plate and the first support leg form a slot for accommodating the open end of the upper vertebral plate at the vertebral plate opening; A second support leg is provided on the inner side of the connection between the transverse arc plate and the lower fixed plate, and the connection end between the transverse arc plate and the vertical arc plate is higher than the connection end between the transverse arc plate and the lower fixed plate; The included angle between the second support leg and the lower fixing plate is a right angle or an obtuse angle.

2. The fusion door fixing device according to claim 1, characterized in that: The lower fixing plate is further provided with one or more second through holes, and second lamina screws for fixing the lower lamina at the lamina opening are provided in the second through holes.

3. The fusion door fixing device according to claim 2, characterized in that: The lower fixation plate is provided with one or more second fusion holes near the next vertebral body, and the center lines of the second fusion holes are inclined 50°-80° relative to the vertical line or the lower fixation plate is bent 20°-40°.

4. The fusion door fixing device according to claim 3, characterized in that: The plurality of second fusion holes are arranged side by side in a transverse direction.

5. The fusion door fixing device according to any one of claims 2 to 4, characterized in that: The upper fixing plate is provided with one or more first through holes, and first lamina screws for fixing the upper lamina at the lamina opening are provided in the first through holes.

6. The fusion door fixing device according to claim 5, characterized in that: The lower end surfaces of the screw heads of the first lamina screw and the second lamina screw are both spherical structures, and the first through hole and the second through hole are both spherical groove structures that match the spherical structures; And / or, both the first through hole and the second through hole are countersunk holes without internal threads.

7. The fusion door fixing device according to claim 1, characterized in that: The included angle between the second support leg and the lower fixed plate is 90°-120°.

8. The fusion door fixing device according to claim 1, characterized in that: The upper fixing plate, the vertical curved plate, the horizontal curved plate and the lower fixing plate are made of titanium alloy or pure titanium.

9. The fusion door fixing device according to claim 1, characterized in that: The thickness of the upper fixing plate, the vertical curved plate, the horizontal curved plate and the lower fixing plate are independently 0.4-1.0 mm.

10. The fusion door fixing device according to claim 1, characterized in that: The radius of the transverse arc plate is 5-13.5 mm.

11. The fusion door fixing device according to claim 1, characterized in that: The vertical arc plate is in the shape of an elliptical arc that bulges downward toward the fixed plate side.

12. The fusion door fixing device according to claim 1, characterized in that: The radius of the vertical curved plate is 2.5-5 mm.

13. The fusion door fixing device according to claim 1, characterized in that: The transverse length of the first support leg is 0.5-2.0 mm.

14. The fusion door fixing device according to claim 1, characterized in that: The vertical arc plate and the horizontal arc plate are tangentially connected, and / or the height difference between the first support leg and the lower fixed plate is 3-7 mm, and / or more than two horizontal steps are provided on the inner side of the slot.

15. A spinal internal fixation system comprising the fusion open-door fixation device according to any one of claims 1 to 14.

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