Spinal interbody fusion cage with adjustable modulus of elasticity

Abstract

The utility model discloses the spinal interbody fusion cage of adjustable elastic modulus relates to the orthopedics equipment field, including roof and bottom plate, the roof corresponds with bottom plate, the bottom plate upside fixedly connected with installation component, the roof is installed with a plurality of high elastic modulus pad and low elastic modulus pad through installation component between bottom plate, the installation component includes the locating plate of vertical fixed connection in the bottom plate upside, is established in a plurality of vertical locating slot on the locating plate. Advantageous effects lie in: through the quantity of adjusting high elastic modulus pad and low elastic modulus pad can adjust the elastic modulus of this fusion ware, increase the quantity of high elastic modulus pad, reduce the quantity of low elastic modulus pad, can increase the elastic modulus of this fusion ware, if reduce the quantity of high elastic modulus pad, increase the quantity of low elastic modulus pad, can reduce the elastic modulus of this fusion ware, make this fusion ware can satisfy different patient demand.

Description

Technical Field

[0001] This utility model relates to the field of orthopedic equipment technology, specifically to a spinal interbody fusion device with adjustable elastic modulus. Background Technology

[0002] Spinal fusion devices are crucial implants in spinal surgery, primarily used to treat various spinal diseases such as herniated discs, spinal degeneration, and spinal fractures. Their core function is to be implanted into the diseased intervertebral space, undertaking the crucial task of restoring the height of the intervertebral space and allowing the narrowed space due to disease to return to its proper height.

[0003] In the application of spinal fusion devices, elastic modulus is a key parameter. Human bones have a certain elastic modulus, and when a spinal fusion device is implanted, the degree to which the elastic modulus of the fusion device matches that of the human bone is crucial. If the elastic modulus of the fusion device is much higher than that of the bone, such as with traditional titanium alloy fusion devices, it will bear excessive loads under stress, resulting in reduced stress on the bone, creating a stress shielding effect, and consequently causing problems such as bone resorption and bone atrophy.

[0004] Existing interbody fusion cages have several shortcomings. Firstly, traditional metal interbody fusion cages, such as those made of titanium alloy, while possessing high strength and good biocompatibility, have an elastic modulus far exceeding that of human bone, making them prone to stress shielding. This reduces the stress on the bone, leading to bone resorption and atrophy, affecting natural bone healing, and increasing the risk of complications such as cage subsidence and loosening. Secondly, different patients have varying bone conditions, disease severity, and individual differences; interbody fusion cages with a single elastic modulus cannot meet the needs of all patients, making personalized treatment difficult. Utility Model Content

[0005] The purpose of this invention is to provide a spinal interbody fusion device with adjustable elastic modulus to solve the above problems, as detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The adjustable elastic modulus spinal interbody fusion device provided by this utility model includes a top plate and a bottom plate, the top plate and the bottom plate are corresponding, an installation component is fixedly connected to the upper side of the bottom plate, and a plurality of high elastic modulus pads and low elastic modulus pads are installed between the top plate and the bottom plate through the installation component.

[0008] The installation assembly includes a positioning plate that is vertically fixed to the upper side of the base plate. The positioning plate has several vertical positioning grooves. Both the high elastic modulus pad and the low elastic modulus pad have slots that are adapted to the positioning plate. Several clips that are adapted to the positioning groove are distributed on both sides of the slot, and the clips are fitted with the positioning groove with a clearance.

[0009] A high-elasticity modulus pad is fixedly connected to the bottom of the top plate.

[0010] The elastic modulus of the spinal interbody fusion device described above can be adjusted by changing the number of high elastic modulus pads and low elastic modulus pads. Increasing the number of high elastic modulus pads and decreasing the number of low elastic modulus pads can increase the elastic modulus of the device. Conversely, decreasing the number of high elastic modulus pads and increasing the number of low elastic modulus pads can decrease the elastic modulus of the device.

[0011] High-modulus and low-modulus pads are mounted between the top and bottom plates via mounting components, allowing for easy adjustment of the number of high-modulus and low-modulus pads.

[0012] Preferably, the top plate and the bottom plate are fixedly connected to the side opposite to the spine with connecting blocks, and the connecting blocks are inclined with screw holes, and the screw holes on the upper and lower sides pass through the top plate and the bottom plate respectively.

[0013] Preferably, both the top plate and the bottom plate are provided with a bioactive coating.

[0014] Preferably, the high-elasticity modulus pad and the low-elasticity modulus pad are arranged in parallel layers.

[0015] Preferably, the high elastic modulus pad includes a first fixing plate and a second fixing plate. Several support structures are fixedly connected between the first fixing plate and the second fixing plate. Both the first fixing plate and the second fixing plate are provided with slots, and the slots are clearance-fitted with the positioning plate. Fixing strips are fixedly connected to both sides of the slots of the second fixing plate. Several clips are fixedly connected to the opposite sides of the two fixing strips, and the surface of the clips is curved.

[0016] Preferably, a telescopic gap is left between the fixing strip and the fixing plate, and a telescopic gap is left between the positioning plate and the top plate.

[0017] Preferably, the corresponding positions of the fixing plate one, fixing plate two, top plate and bottom plate are provided with hollow openings for placing bone tissue.

[0018] Preferably, the support structure is spring-shaped, and the high elastic modulus pad and the low elastic modulus pad have the same structure, with the elastic modulus of the support structure of the high elastic modulus pad being greater than that of the support structure of the low elastic modulus pad.

[0019] The beneficial effects are:

[0020] 1. The elastic modulus of the fusion device can be adjusted by changing the number of high elastic modulus pads and low elastic modulus pads. Increasing the number of high elastic modulus pads and decreasing the number of low elastic modulus pads can increase the elastic modulus of the fusion device. Conversely, decreasing the number of high elastic modulus pads and increasing the number of low elastic modulus pads can decrease the elastic modulus of the fusion device, thus enabling the fusion device to meet the needs of different patients.

[0021] 2. The high-elasticity modulus pad and the low-elasticity modulus pad are installed between the top plate and the bottom plate by the mounting assembly, which makes it easy to adjust the number of high-elasticity modulus pads and low-elasticity modulus pads. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0024] Figure 2 This is a front view structural diagram of the present invention;

[0025] Figure 3 This is a schematic diagram of the exploded structure of the high elastic modulus pad of this utility model;

[0026] Figure 4 This is a schematic diagram of the three-dimensional cross-sectional structure of the positioning plate of this utility model.

[0027] The annotations in the attached figures are explained as follows:

[0028] 1. Top plate; 2. Bottom plate; 3. Connecting block; 4. Screw hole; 5. High elastic modulus pad; 6. Low elastic modulus pad; 7. Mounting component; 8. Cutout; 9. Fixing plate one; 10. Slot; 11. Fixing plate two; 12. Support structure; 13. Fixing strip; 14. Clip head; 15. Positioning plate; 16. Positioning groove. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] See Figures 1-4 As shown, this utility model provides an adjustable elastic modulus spinal interbody fusion device, including a top plate 1 and a bottom plate 2, the top plate 1 and the bottom plate 2 are corresponding, the bottom plate 2 is fixedly connected to the upper side of the bottom plate 2, and a plurality of high elastic modulus pads 5 and low elastic modulus pads 6 are installed between the top plate 1 and the bottom plate 2 through the installation component 7.

[0031] The mounting assembly 7 includes a positioning plate 15 that is vertically fixed to the upper side of the base plate 2. The positioning plate 15 has several vertical positioning grooves 16. The high elastic modulus pad 5 and the low elastic modulus pad 6 both have slots 10 that are adapted to the positioning plate 15. Several clips 14 that are adapted to the positioning grooves 16 are distributed on both sides of the slots 10, and the clips 14 are in clearance fit with the positioning grooves 16.

[0032] A high-elasticity modulus pad 5 is fixedly connected to the bottom of the top plate 1.

[0033] As an optional implementation, the top plate 1 and the bottom plate 2 are both fixedly connected to the side opposite to the spine with connecting blocks 3, and the connecting blocks 3 are inclinedly provided with screw holes 4, and the screw holes 4 on the upper and lower sides respectively penetrate the top plate 1 and the bottom plate 2.

[0034] Insert the screw into screw hole 4, pass the screw through the vertebra, and the fusion device can be fixed between the two vertebrae by the screw hole 4 and the screw.

[0035] Both the top plate 1 and the bottom plate 2 are coated with a bioactive coating, which is beneficial for the fusion device to integrate with the human body.

[0036] The high elastic modulus pad 5 and the low elastic modulus pad 6 are parallel to each other and stacked. The high elastic modulus pad 5 and the low elastic modulus pad 6 together constitute the support capacity of the fusion device.

[0037] The high elastic modulus pad 5 includes a first fixing plate 9 and a second fixing plate 11. Several support structures 12 are fixedly connected between the first fixing plate 9 and the second fixing plate 11. The first fixing plate 9 and the second fixing plate 11 are both provided with slots 10, and the slots 10 are clearance-fitted with the positioning plate 15. Fixing strips 13 are fixedly connected to both sides of the slots 10 of the second fixing plate 11. Several clips 14 are fixedly connected to the opposite surfaces of the two fixing strips 13, and the surface of the clips 14 is arc-shaped.

[0038] The curved design of the clip 14 makes it easier to snap into the positioning groove 16. The clip 14 and the groove 10 cooperate, and the groove 10 and the positioning plate 15 cooperate to achieve stable installation of the high elastic modulus pad 5 and the low elastic modulus pad 6.

[0039] There is a telescopic gap between the fixing strip 13 and the fixing plate 9, and a telescopic gap between the positioning plate 15 and the top plate 1. This telescopic gap is the necessary telescopic space for the fusion device.

[0040] Hollow openings 8 are provided at corresponding positions of fixation plate 1 9, fixation plate 2 11, top plate 1 and bottom plate 2 for placing bone tissue. The bone tissue comes from the patient himself, and the fusion device can be better fused with the vertebrae through the bone tissue.

[0041] The support structure 12 is spring-shaped. The high elastic modulus pad 5 and the low elastic modulus pad 6 have the same structure. The support structure 12 of the high elastic modulus pad 5 has a greater elastic modulus than the support structure 12 of the low elastic modulus pad 6.

[0042] The support structure 12 of the high-elasticity modulus pad 5 can be made of titanium alloy, while the support structure 12 of the low-elasticity modulus pad 6 can be made of soft materials such as modified PEEK. Furthermore, during manufacturing, based on the patient's preoperative bone elasticity modulus measurements, 3D printing technology is used to precisely control the thickness and number of the high-elasticity modulus pad 5 and the low-elasticity modulus pad 6. For example, for patients with low bone elasticity modulus, increasing the number of high-elasticity modulus pads 5 and decreasing the number of low-elasticity modulus pads 6 can increase the elasticity modulus of the fusion device; conversely, decreasing the number of high-elasticity modulus pads 5 and increasing the number of low-elasticity modulus pads 6 can decrease the elasticity modulus of the fusion device.

[0043] Using the above structure, the elastic modulus of the fusion unit can be adjusted by changing the number of high elastic modulus pads 5 and low elastic modulus pads 6. Increasing the number of high elastic modulus pads 5 and decreasing the number of low elastic modulus pads 6 can increase the elastic modulus of the fusion unit. Conversely, decreasing the number of high elastic modulus pads 5 and increasing the number of low elastic modulus pads 6 can decrease the elastic modulus of the fusion unit.

[0044] The high-elasticity modulus pad 5 and the low-elasticity modulus pad 6 are mounted between the top plate 1 and the bottom plate 2 via the mounting assembly 7, thereby facilitating the adjustment of the number of the high-elasticity modulus pad 5 and the low-elasticity modulus pad 6.

[0045] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An adjustable elastic modulus spinal interbody fusion device, characterized in that: It includes a top plate (1) and a bottom plate (2), the top plate (1) and the bottom plate (2) are corresponding, and an installation component (7) is fixedly connected to the upper side of the bottom plate (2). Several high elastic modulus pads (5) and low elastic modulus pads (6) are installed between the top plate (1) and the bottom plate (2) through the installation component (7). The mounting assembly (7) includes a positioning plate (15) that is vertically fixed to the upper side of the base plate (2). The positioning plate (15) has several vertical positioning grooves (16). The high elastic modulus pad (5) and the low elastic modulus pad (6) both have slots (10) that are adapted to the positioning plate (15). Several clips (14) that are adapted to the positioning grooves (16) are distributed on both sides of the slots (10), and the clips (14) and the positioning grooves (16) are fitted with a clearance. A high elastic modulus pad (5) is fixedly connected to the bottom of the top plate (1).

2. The spinal interbody fusion device with adjustable elastic modulus according to claim 1, characterized in that: The top plate (1) and the bottom plate (2) are both fixedly connected to the side opposite to the spine with connecting blocks (3), and the connecting blocks (3) are inclinedly provided with screw holes (4), and the screw holes (4) on the upper and lower sides respectively penetrate the top plate (1) and the bottom plate (2).

3. The spinal interbody fusion device with adjustable elastic modulus according to claim 1, characterized in that: Both the top plate (1) and the bottom plate (2) are provided with a bioactive coating.

4. The spinal interbody fusion device with adjustable elastic modulus according to claim 1, characterized in that: The high elastic modulus pad (5) and the low elastic modulus pad (6) are parallel to each other and stacked in layers.

5. The spinal interbody fusion device with adjustable elastic modulus according to claim 4, characterized in that: The high elastic modulus pad (5) includes a first fixing plate (9) and a second fixing plate (11). Several support structures (12) are fixedly connected between the first fixing plate (9) and the second fixing plate (11). The first fixing plate (9) and the second fixing plate (11) are both provided with slots (10), and the slots (10) are clearance-fitted with the positioning plate (15). Fixing strips (13) are fixedly connected to both sides of the slots (10) of the second fixing plate (11). Several clips (14) are fixedly connected to the opposite sides of the two fixing strips (13), and the surface of the clips (14) is arc-shaped.

6. The spinal interbody fusion device with adjustable elastic modulus according to claim 5, characterized in that: There is a telescopic gap between the fixing strip (13) and the fixing plate (9), and there is a telescopic gap between the positioning plate (15) and the top plate (1).

7. The spinal interbody fusion device with adjustable elastic modulus according to claim 5, characterized in that: The corresponding positions of the fixing plate 1 (9), fixing plate 2 (11), top plate (1) and bottom plate (2) are all provided with hollow openings (8) for placing bone tissue.

8. The spinal interbody fusion device with adjustable elastic modulus according to claim 5, characterized in that: The support structure (12) is spring-shaped. The high elastic modulus pad (5) and the low elastic modulus pad (6) have the same structure. The support structure (12) of the high elastic modulus pad (5) has a greater elastic modulus than the support structure (12) of the low elastic modulus pad (6).

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