Vertebral prosthesis

Abstract

The present invention provides a vertebral prosthesis, comprising: a first vertebral body, a second vertebral body and a first gas spring; the first gas spring is arranged between the first vertebral body and the second vertebral body, so that the distance between the first vertebral body and the second vertebral body can be adjusted. The technical solution of the present invention effectively solves the problem of poor fit between the vertebral prosthesis and the adjacent vertebral body in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of artificial prostheses, and in particular to a vertebral prosthesis. Background Art

[0002] The human spine is composed of 33 vertebrae (7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 9 sacrum and coccyx) connected by ligaments, joints and intervertebral discs. The spine is the axial skeleton of the human body and the pillar of the body. It has the functions of weight bearing, shock absorption, protection and movement.

[0003] Due to trauma, infection, tumors and other reasons, spinal vertebrae will have defects. When the defects are severe, surgical resection is a common means of treatment. After the vertebra is removed, vertebral reconstruction is required to maintain spinal stability. There are various vertebral reconstruction techniques. In the early stage, artificial bone grafting and titanium mesh reconstruction were mostly used. Traditional methods require long bed rest after surgery, and are prone to complications of internal fixation failure such as sinking and displacement in the long term, and even require secondary revision surgery. The emergence of artificial vertebrae has solved this problem well. The arc design at both ends can fit with the spine, instantly stabilize the spine, reduce the probability of long-term internal fixation failure, and reduce the patient's bed rest time after surgery. It can get up early and improve the patient's quality of life. With the rise of 3D printing technology, 3D printed artificial vertebrae have also been used in clinical practice, giving full play to the precise construction concept of 3D printing. The personalized and customized design is more in line with human mechanics and physiological structure, and can meet the individual needs of patients.

[0004] However, the conventional artificial vertebral endplate surface is regular, while the anatomical morphology of the spinal endplate is often irregular, and there will be more or less gaps after installation. When designing a customized vertebral prosthesis, the endplate surface refers to the patient's imaging information, but during surgery, due to pressure, distraction and other surgical operations, the angle of the endplate surface may change, and the attachment of the vertebral prosthesis will not be completely ideal. Summary of the invention

[0005] The main purpose of the present invention is to provide a vertebral prosthesis to solve the problem of poor fit between the vertebral prosthesis and the adjacent vertebrae in the prior art.

[0006] To achieve the above object, the present invention provides a vertebral prosthesis, comprising: a first vertebral body, a second vertebral body and a first gas spring; the first gas spring is arranged between the first vertebral body and the second vertebral body so that the distance between the first vertebral body and the second vertebral body can be adjusted.

[0007] Furthermore, there are a plurality of first gas springs, and the first gas springs are arranged at intervals.

[0008] Furthermore, the cylinder of the first gas spring is fixedly connected to the second vertebral body, and the piston rod of the first gas spring is fixedly connected to the first vertebral body.

[0009] Furthermore, the first vertebra is provided with a first cylinder mounting hole, and the cylinder of the first gas spring is installed in the first cylinder mounting hole with interference fit. The second vertebra is provided with a first piston rod mounting hole, and the piston rod of the first gas spring is installed in the first piston rod mounting hole with interference fit.

[0010] Furthermore, a first porous structure is provided on a surface of the first vertebral body away from the second vertebral body.

[0011] Furthermore, the pore diameter of the first porous structure is between 400 μm and 1200 μm.

[0012] Furthermore, the vertebral prosthesis also includes a third vertebra and a second gas spring, the second gas spring is arranged between the second vertebra and the third vertebra, and the third vertebra is arranged on a side of the second vertebra away from the first vertebra.

[0013] Further, the first gas spring and the second gas spring are arranged correspondingly.

[0014] Furthermore, the cylinder of the second gas spring is fixedly connected to the second vertebral body, and the piston rod of the second gas spring is fixedly connected to the third vertebral body.

[0015] Furthermore, a second porous structure is provided on a surface of the third vertebral body on a side away from the first vertebral body.

[0016] Furthermore, the pore diameter of the second porous structure is between 400 μm and 1200 μm.

[0017] Furthermore, the first vertebra, the second vertebra and the third vertebra are all manufactured by 3D printing technology.

[0018] By applying the technical solution of the present invention, the distance between the first vertebra and the second vertebra of the vertebral prosthesis can be adjusted. When the vertebral prosthesis is in use, the first gas spring is in a compressed state, and then the first gas spring is extended to gradually increase the distance between the first vertebra and the second vertebra, so that the vertebral prosthesis fits tightly with the adjacent vertebra, and the vertebral prosthesis is more stable. The technical solution of the present invention effectively solves the problem of unsatisfactory fit between the vertebral prosthesis and the adjacent vertebra in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 It shows a schematic diagram of the three-dimensional structure of an embodiment of a vertebral prosthesis according to the present invention when it is extended;

[0021] Figure 2 Shows Figure 1 A schematic front view of a vertebral prosthesis;

[0022] Figure 3 Shows Figure 1 A schematic top view of a vertebral prosthesis; and

[0023] Figure 4 Shows Figure 1 Schematic diagram of the structure of a vertebral prosthesis when it is contracted.

[0024] The above drawings include the following reference numerals:

[0025] 10. First vertebra; 20. Second vertebra; 30. First gas spring; 40. Third vertebra; 50. Second gas spring. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for clarity, the thickness of the layers and regions is enlarged, and the same reference numerals are used to represent the same devices, so their description will be omitted.

[0030] like Figures 1 to 4 As shown, the vertebral prosthesis of this embodiment includes: a first vertebral body 10, a second vertebral body 20 and a first gas spring 30. The first gas spring 30 is arranged between the first vertebral body 10 and the second vertebral body 20 so that the distance between the first vertebral body 10 and the second vertebral body 20 can be adjusted.

[0031] By applying the technical solution of this embodiment, the distance between the first vertebral body 10 and the second vertebral body 20 of the vertebral prosthesis can be adjusted. When the vertebral prosthesis is in use, the first gas spring 30 is in a compressed state, and then the first gas spring 30 is stretched to gradually increase the distance between the first vertebral body 10 and the second vertebral body 20, so that the vertebral prosthesis fits closely with the adjacent vertebral body, and the vertebral prosthesis is more stable. The technical solution of this embodiment effectively solves the problem of unsatisfactory fit between the vertebral prosthesis and the adjacent vertebral body in the prior art.

[0032] It should be noted that the cross section of the first vertebral body 10 is an arc shape that matches the adjacent vertebral body, and the first gas spring 30 has a self-locking function.

[0033] like Figure 1 As shown, in the technical solution of this embodiment, there are multiple first gas springs 30, and the first gas springs 30 are arranged at intervals. The first gas springs 30 are multiple structures, so that the angle of the first vertebral body 10 can be adjusted according to the height of each first gas spring 30.

[0034] like Figure 1 As shown, in the technical solution of this embodiment, the cylinder of the first gas spring 30 is fixedly connected to the second vertebral body 20, and the piston rod of the first gas spring 30 is fixedly connected to the first vertebral body 10. The above structure makes the vertebral prosthesis not easy to dislocate and has a longer service life.

[0035] like Figure 1As shown, in the technical solution of this embodiment, the second vertebral body 20 is provided with a first cylinder mounting hole, and the cylinder of the first gas spring 30 is installed in the first cylinder mounting hole with an interference fit, and the first vertebral body 10 is provided with a first piston rod mounting hole, and the piston rod of the first gas spring 30 is installed in the first piston rod mounting hole with an interference fit. The above structure has low processing cost and is easy to install. In order to make the structure more stable, a fixing pin is also provided between the cylinder of the first gas spring 30 and the first cylinder mounting hole for fixing, and the first piston rod mounting hole and the piston rod of the first gas spring 30 are also fixed by a pin, and the above structure makes the structure of the vertebral prosthesis more stable.

[0036] like Figure 1 As shown, in the technical solution of this embodiment, the surface of the first vertebral body 10 away from the second vertebral body 20 is provided with a first porous structure. The setting of the first porous structure is conducive to the creeping growth of bone cells, so that the bone fusion of the joint surface of the postoperative vertebral prosthesis and the physiological bone structure can achieve long-term stability. Specifically, the pore diameter of the first porous structure is between 400μm and 1200μm. The above-mentioned pores are more conducive to the growth of bone cells, and more specifically, the pore diameter is 800μm.

[0037] like Figure 1 As shown, in the technical solution of this embodiment, the vertebral prosthesis further includes a third vertebral body 40 and a second gas spring 50, the second gas spring 50 is arranged between the second vertebral body 20 and the third vertebral body 40, and the third vertebral body 40 is arranged on the side of the second vertebral body 20 away from the first vertebral body 10. The arrangement of the third vertebral body 40 and the second gas spring 50 ensures that the vertebral prosthesis can have a longer extension or shortening distance on the one hand, and makes the structure of the vertebral prosthesis more solid on the other hand.

[0038] like Figure 1 As shown, in the technical solution of this embodiment, the first gas spring 30 and the second gas spring 50 are arranged correspondingly. This makes the forces on the first vertebral body 10, the second vertebral body 20 and the third vertebral body 40 relatively balanced. Specifically, there are multiple first gas springs 30, and the second gas springs 50 are arranged in a plurality corresponding to the multiple first gas springs 30.

[0039] like Figure 1 As shown, in the technical solution of this embodiment, the cylinder of the second gas spring 50 is fixedly connected to the second vertebral body 20, and the piston rod of the second gas spring 50 is fixedly connected to the third vertebral body 40. The above structure makes the vertebral prosthesis not easy to dislocate and has a longer service life.

[0040] like Figure 1As shown, in the technical solution of this embodiment, the second vertebral body 20 is provided with a second cylinder hole, and the cylinder of the second gas spring 50 is installed in the second cylinder mounting hole with interference fit, and the third vertebral body 40 is provided with a second piston rod mounting hole, and the piston rod of the second gas spring 50 is installed in the second piston rod mounting hole with interference fit. The above structure has low processing cost and is easy to install. In order to make the structure more stable, a fixing pin is also provided between the cylinder of the second gas spring 50 and the second cylinder hole for fixing, and the second piston rod mounting hole and the piston rod of the second gas spring 50 are also fixed by the pin, and the above structure makes the structure of the vertebral prosthesis more stable.

[0041] like Figure 1 As shown, in the technical solution of this embodiment, a second porous structure is provided on the surface of the third vertebral body 40 away from the first vertebral body 10. The setting of the second porous structure is conducive to the creeping growth of bone cells, so that the bone fusion of the joint surface of the postoperative vertebral prosthesis and the physiological bone structure can achieve long-term stability. Specifically, the pore diameter of the second porous structure is between 400μm and 1200μm. The above-mentioned pores are more conducive to the growth of bone cells, and more specifically, the pore diameter is 800μm.

[0042] like Figure 1 As shown, in the technical solution of this embodiment, the first vertebra 10, the second vertebra 20 and the third vertebra 40 are all manufactured by 3D printing technology. The manufacturing precision of 3D printing technology is relatively high. Specifically, the surface of the first vertebra 10 away from the second vertebra 20 is a non-convex-concave structure, and the first vertebra 10 is adapted to the adjacent vertebra by adjusting the different heights of the multiple first gas springs 30. The surface of the third vertebra 40 away from the second vertebra 20 is a non-convex-concave structure, and the third vertebra 40 is adapted to the adjacent vertebra by adjusting the different heights of the multiple second gas springs 50. Specifically, the cross-section of the third vertebra 40 is an arc that is adapted to the adjacent vertebra, and the second gas spring 50 has a self-locking function.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vertebral prosthesis, characterized in that: include: A first vertebral body (10), a second vertebral body (20) and a first gas spring (30); The first gas spring (30) is arranged between the first vertebral body (10) and the second vertebral body (20), so that the distance between the first vertebral body (10) and the second vertebral body (20) can be adjusted; There are a plurality of first gas springs (30), the first gas springs (30) are arranged at intervals, the cylinder of the first gas spring (30) is fixedly connected to the second vertebra (20), the piston rod of the first gas spring (30) is fixedly connected to the first vertebra (10), and the first vertebra (10) is adapted to an adjacent vertebra by adjusting the different heights of the plurality of first gas springs (30); The vertebral prosthesis further comprises a third vertebral body (40) and a second gas spring (50), wherein the second gas spring (50) is arranged between the second vertebral body (20) and the third vertebral body (40), the third vertebral body (40) is arranged on a side of the second vertebral body (20) away from the first vertebral body (10), and the first gas spring (30) and the second gas spring (50) are arranged correspondingly; The cylinder of the second gas spring (50) is fixedly connected to the second vertebra (20), and the piston rod of the second gas spring (50) is fixedly connected to the third vertebra (40), and the third vertebra (40) is adapted to an adjacent vertebra by adjusting the different heights of a plurality of the second gas springs (50).

2. The vertebral prosthesis according to claim 1, characterized in that: The first vertebral body (10) is provided with a first cylinder mounting hole, and the cylinder of the first gas spring (30) is installed in the first cylinder mounting hole with an interference fit; the second vertebral body (20) is provided with a first piston rod mounting hole, and the piston rod of the first gas spring (30) is installed in the first piston rod mounting hole with an interference fit.

3. The vertebral prosthesis according to claim 1, characterized in that: A first porous structure is provided on a surface of the first vertebral body (10) away from the second vertebral body (20).

4. The vertebral prosthesis according to claim 3, characterized in that: The pore diameter of the first porous structure is between 400 μm and 1200 μm.

5. The vertebral prosthesis according to claim 1, characterized in that: A second porous structure is provided on the surface of the third vertebral body (40) on a side away from the first vertebral body (10).

6. The vertebral prosthesis according to claim 5, characterized in that: The pore diameter of the second porous structure is between 400 μm and 1200 μm.

7. The vertebral prosthesis according to claim 1, characterized in that: The first vertebral body (10), the second vertebral body (20) and the third vertebral body (40) are all manufactured using a 3D printing process.

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