Artificial vertebral body

Abstract

The utility model discloses an artificial vertebral body which comprises a tube body, end caps are arranged at the two ends of the tube body respectively, and the radial size of each end cap is larger than the outer diameter of the tube body. The top face of the end cap is of an arc-shaped structure with the middle protruding and matched with a vertebral end plate, and an opening communicated with a pipe cavity of the pipe body is formed in the top face of the end cap. A plurality of grooves distributed at intervals are evenly formed in the area, surrounding the opening, of the end cap, and the grooves extend in the radial direction of the end cap. The tube body and the end caps are both structural parts made of medical nano-hydroxyapatite and polyamide 66 composite materials. According to the scheme, the problems that the postoperative curative effect of an existing artificial vertebral body is not easy to evaluate, and the existing artificial vertebral body sinks seriously after being implanted and easily shifts to influence the surgical effect can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical prostheses, in particular to an artificial vertebral body. Background Art

[0002] Artificial vertebrae are supports used to repair local defects caused by surgical resection of spinal lesions (such as tumors, trauma, infections, etc.); the supports currently used in clinical practice are mainly titanium mesh structures made of titanium metal. However, titanium alloys have stress shielding and artifacts, which can easily lead to problems such as difficulty in evaluating postoperative efficacy and severe sinking of the support body. In addition, they are prone to displacement, affecting the surgical effect. Utility Model Content

[0003] The utility model discloses an artificial vertebral body, which solves the problems of the current artificial vertebral body in that the postoperative efficacy is difficult to evaluate, the artificial vertebral body sinks severely after implantation, and the artificial vertebral body is easily displaced, which affects the surgical effect.

[0004] In order to solve the above problems, the present invention adopts the following technical solutions:

[0005] An artificial vertebral body comprises a tubular body, with end caps provided at both ends, wherein the radial dimension of the end caps is greater than the outer diameter of the tubular body; the top surface of the end caps is an arc-shaped structure with a central protrusion adapted to the vertebral endplate, and is provided with an opening communicating with the tubular lumen of the tubular body; the end caps are evenly provided with a plurality of grooves distributed at intervals in an area surrounding the opening, and the grooves extend in the radial direction of the end caps; the tubular body and the end caps are both structural components made of a composite material of medical nanohydroxyapatite and polyamide 66.

[0006] Optionally, a radial dimension of the opening is smaller than a radial dimension of the lumen, and the end cap surrounds the opening and is arranged in a mesh structure in an area corresponding to the lumen.

[0007] Optionally, the groove is located in the peripheral area of ​​the mesh structure; or, the groove extends from the peripheral area of ​​the mesh structure to the area of ​​the mesh structure; or, the groove is located in the area of ​​the mesh structure.

[0008] Optionally, the pore diameter of the mesh structure is 300-600 μm.

[0009] Optionally, the thickness of the tube body is 3-4 mm.

[0010] Optionally, the cross-sectional shape of the groove is an inverted trapezoidal structure that is wide at the top and narrow at the bottom, and the portion between two adjacent grooves is a triangular structure with the tip pointing upward.

[0011] Optionally, a portion between two adjacent grooves protrudes from the top surface of the end cap.

[0012] Optionally, the side wall of the tube body is provided with a through hole communicating with the tube cavity of the tube body; the through hole is an elliptical through hole, and the long axis of the elliptical through hole is parallel to the center line of the tube body.

[0013] Optionally, the through holes are arranged in four rows evenly distributed along the circumference of the tube body, and there are multiple through holes in each row, which are arranged at equal intervals along the length direction of the tube body.

[0014] Optionally, the inner side wall of the tube body is provided with ridges extending along the length direction of the tube body.

[0015] The technical solution adopted by the utility model can achieve the following beneficial effects:

[0016] The artificial vertebra disclosed in the present invention can increase the contact area between the artificial vertebra and the upper vertebral endplate and the lower vertebral endplate through the end cap structure with a central convex arc structure, and well ensure the fit of their contact support cooperation, thereby facilitating the uniform distribution of force on the artificial vertebra and avoiding the problem of sinking caused by excessive local force. In addition, the tube body and end cap made of medical nano-hydroxyapatite and polyamide 66 composite material have mechanical properties similar to those of PEEK (polyetheretherketone) material, and are similar to human bone tissue, which can enhance osteogenic activity and avoid the problems of stress shielding and artifacts existing in titanium alloy materials. At the same time, the end cap is also provided with multiple grooves evenly spaced around the opening, and the grooves extend radially along the radial direction of the end cap, so that the friction between the end cap and the vertebral endplate can be effectively increased by the grooves, and the friction direction of each groove is along the tangent direction of the end cap. Compared with circular protrusions or ridges or grooves arranged in the same direction, the rotation and displacement of the artificial vertebra can be better prevented, thereby improving the surgical effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part 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:

[0018] Figure 1 Schematic diagram of the structure of the artificial vertebra disclosed in the embodiment of the present utility model;

[0019] Figure 2 A side view of the artificial vertebral body disclosed in an embodiment of the present utility model;

[0020] Description of reference numerals:

[0021] 100-tube body, 110-through hole,

[0022] 200-end cap, 210-opening, 220-mesh, 230-groove. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will provide a clear and complete description of the technical solutions of the present invention in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0024] The technical solutions disclosed in various embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] Please refer to Figure 1 and Figure 2 As shown, an embodiment of the present invention discloses an artificial vertebral body, which includes a tube body 100, with end caps 200 provided at both ends of the tube body 100, and the radial size of the end caps 200 is larger than the outer diameter of the tube body 100; the top surface of the end cap 200 is an arc-shaped structure with a central bulge adapted to the vertebral end plate, and is provided with an opening 210 connected to the tubular cavity of the tube body 100; the area surrounding the opening 210 of the end cap 200 is evenly provided with a plurality of grooves 230 distributed at intervals, and the grooves 230 extend along the radial direction of the end cap 200; the tube body 100 and the end cap 200 are both structural components made of medical nano-hydroxyapatite and polyamide 66 composite materials.

[0026] Among them, the opening 210 structure of the end cap 200 makes it convenient for medical personnel to fill bone cement or bone into the tubular cavity of the tube body 100, and the end cap 200 structure with a middle bulge in an arc-shaped structure can not only increase the contact area between the artificial vertebral body and the upper vertebral end plate and the lower vertebral end plate, but also well ensure the fit of their contact support, which is beneficial to the uniform dispersion of force on the artificial vertebral body and avoids the problem of sinking due to excessive local force. In addition, the tube body 100 and end cap 200 made of medical nano-hydroxyapatite and polyamide 66 composite materials have mechanical properties similar to PEEK (polyetheretherketone) materials, and are similar to human bone tissue, which can enhance osteogenic activity and avoid problems such as stress shielding and artifacts existing in titanium alloy materials.

[0027] At the same time, the end cap 200 is also provided with a plurality of grooves 230 that are evenly distributed around the opening 210, and the grooves 230 extend along the radial direction of the end cap 200, that is, Figure 1The radial distribution shown can effectively increase the friction between the end cap 200 and the vertebral end plate through the groove 230, and make the friction direction of each groove 230 along the tangent direction of the end cap 200. Compared with circular protrusions or ridges or grooves 230 arranged in the same direction, the structure can better prevent the rotation and displacement of the artificial vertebra, thereby improving the surgical effect.

[0028] Preferably, if Figure 1 As shown, the radial dimension of the opening 210 of the end cap 200 is smaller than the radial dimension of the lumen, and the area of ​​the end cap 200 surrounding the opening 210 and corresponding to the lumen is set in a mesh 220 structure, which not only ensures the contact area between the end cap 200 and the vertebral end plate, but also is beneficial to the adhesion and growth of bone cells, promotes the bone integration of the implant material, and better improves the surgical effect; usually, the hole diameter of the mesh 220 structure is 300-600μm.

[0029] In the artificial vertebra disclosed in this embodiment, as a design scheme for the groove 230 and mesh 220 structure, the groove 230 can extend from the outer area of ​​the mesh 220 structure to the area of ​​the mesh 220 structure, or the groove 230 can be distributed in the inner circle area where the mesh 220 structure is located.

[0030] However, as a preferred solution, Figure 1 As shown, the mesh 220 structure is arranged around the periphery of the opening 210, and the groove 230 is arranged around the peripheral area of ​​the mesh 220 structure. Compared with the above technical solution, the problem of local collapse and sinking caused by the overlapping arrangement of the mesh 220 structure and the groove 230 structure affecting the structural strength of the end cap 200 can be avoided.

[0031] At the same time, as a specific embodiment of the groove 230, the cross-sectional shape of the groove 230 can be designed to be an inverted trapezoidal structure that is wide at the top and narrow at the bottom, and the portion between two adjacent grooves 230 is a triangular structure with the tip pointing upward, thereby better preventing rotational displacement of the artificial vertebral body; preferably, the portion between two adjacent grooves 230 protrudes from the top surface of the end cap 200, so that the protruding portion can slightly embed into the vertebral body it contacts, making the anti-rotational displacement effect more significant. Of course, as other embodiments, the groove 230 can also be designed to be other shapes such as square or triangle.

[0032] In the artificial vertebral body disclosed in this embodiment, Figure 1 and Figure 2As shown, the sidewall of the tube body 100 is provided with through holes 110 that communicate with the lumen of the tube body 100. The through holes 110 facilitate bone ingrowth and communication between the inside and outside of the tube body 100, thereby improving surgical outcomes. Specifically, the through holes 110 are arranged in four rows evenly distributed along the circumference of the tube body 100, with multiple through holes 110 in each row arranged at equal intervals along the length of the tube body 100. Of course, the number of rows of through holes 110 and the number of holes in each row can be adaptively increased or decreased based on clinical needs.

[0033] Among them, as a preferred design scheme for the through hole 110, the through hole 110 is an elliptical through hole 110, and the long axis of the elliptical through hole 110 is parallel to the center line of the tube body 100. Therefore, compared with a circular through hole or an elliptical through hole whose long axis is perpendicular to the center line of the tube body 100, the load-bearing effect of the tube body 100 in the length direction can be improved, thereby making the artificial vertebra have better support strength.

[0034] Generally, in order to ensure the structural strength of the tube body 100, the thickness of the tube body 100 is designed to be 3-4 mm; preferably, ridges extending along the length direction of the tube body 100 can be provided on the inner wall of the tube body 100, so as to not only serve as reinforcement ribs to improve the structural strength of the tube body 100 and increase its support strength, but also improve the interlocking effect between the tube body 100 and its internal bone, and better avoid rotational displacement; and, compared with the structure in which reinforcement ribs are provided on the outer wall of the tube body 100, the impact of the artificial vertebral body on the human environment after implantation can be reduced.

[0035] The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0036] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims of the present invention.

Claims

1. An artificial vertebral body, comprising a tubular body, characterized in that: End caps are respectively provided at both ends of the tube body, and the radial dimension of the end caps is greater than the outer diameter of the tube body; the top surface of the end cap is an arc-shaped structure with a central protrusion adapted to the vertebral end plate, and is provided with an opening connected to the tubular lumen of the tube body; the area of ​​the end cap surrounding the opening is evenly provided with multiple grooves distributed at intervals, and the grooves extend along the radial direction of the end cap; the tube body and the end caps are both structural components made of medical nano-hydroxyapatite and polyamide 66 composite materials.

2. The artificial vertebral body according to claim 1, characterized in that The radial dimension of the opening is smaller than the radial dimension of the lumen, and the area of ​​the end cap surrounding the opening and corresponding to the lumen is provided with a mesh structure.

3. The artificial vertebral body according to claim 2, characterized in that The groove is located in the peripheral area of ​​the mesh structure; or, the groove extends from the peripheral area of ​​the mesh structure to the area of ​​the mesh structure; or, the groove is located in the area of ​​the mesh structure.

4. The artificial vertebral body according to claim 3, characterized in that The pore diameter of the mesh structure is 300-600 μm.

5. The artificial vertebral body according to claim 3, characterized in that The thickness of the tube body is 3-4 mm.

6. The artificial vertebral body according to any one of claims 1 to 5, characterized in that The cross-sectional shape of the groove is an inverted trapezoidal structure that is wide at the top and narrow at the bottom, and the portion between two adjacent grooves is a triangular structure with the tip pointing upward.

7. The artificial vertebral body according to claim 6, characterized in that The portion between two adjacent grooves protrudes from the top surface of the end cap.

8. The artificial vertebral body according to any one of claims 1 to 5, characterized in that The side wall of the tube body is provided with a through hole communicating with the tube cavity of the tube body; the through hole is an elliptical through hole, and the long axis of the elliptical through hole is parallel to the center line of the tube body.

9. The artificial vertebral body according to claim 8, characterized in that The through holes are arranged in four rows evenly distributed along the circumference of the tube body, and there are multiple through holes in each row, which are arranged at equal intervals along the length direction of the tube body.

10. The artificial vertebral body according to any one of claims 1 to 5, characterized in that: The inner side wall of the tube body is provided with ridges extending along the length direction of the tube body.

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