ASSEMBLED VERTEBRAL BODY

Abstract

The invention relates to an assembled vertebral body used in a cervical reconstruction operation, comprising: an upper connecting element, an artificial vertebral body element and a lower connecting element, wherein the upper connecting element is disposed at an upper part of the artificial vertebral body element, the lower connecting element is disposed at an lower part of the artificial vertebral body element, and wherein the artificial vertebral body element is assembled with the upper connecting element and the lower connecting element, respectively. The invention has the advantages that the artificial vertebral body element is customized in accordance with the characteristics of patients and printed in 3D, and the length of the artificial vertebral body element can be precisely adjusted to adapt to the patient. Since the lower connecting element is standard part, the upper connecting element is standard part or non-standard part, and the artificial vertebral body element is non-standard part, in comparison to the traditional 3D printing which needs to be printed integrally, the adjustable assembled artificial vertebral body can reduce 3D printing materials and reduce the cost of 3D printing, thus reducing medical costs for the patient. The shape of the nested parts of the elements is a non-circular shape, which can resist rotation, so that no relative movement occurs among the three elements of the artificial vertebral body.

Claims

1. An assembled vertebral body used in a cervical reconstruction operation, comprising: an upper connecting element, an artificial vertebral body element and a lower connecting element, wherein the upper connecting element is disposed at an upper part of the artificial vertebral body element, the lower connecting element is disposed at an lower part of the artificial vertebral body element, and wherein the artificial vertebral body element is assembled with the upper connecting element and the lower connecting element, respectively.

2. The assembled vertebral body of claim 1, wherein the artificial vertebral body element is nestedly connected with the upper connecting element and the lower connecting element, respectively.

3. The assembled vertebral body of claim 2, wherein the upper connecting element comprises a first nesting part disposed at a lower part of the upper connecting element; the lower connecting element comprises a second nesting part disposed at an upper part of the lower connecting element; and the artificial vertebral body element comprises a third nesting part disposed at the upper part of the artificial vertebral body element, and a fourth nesting part disposed at the lower part of the artificial vertebral body element; and wherein the first nesting part is nestedly connected with the third nesting part, and the second nesting part is nestedly connected with the fourth nesting part.

4. The assembled vertebral body of claim 3, wherein the first nesting part and the second nesting part are protruding blocks, the third nesting part and the fourth nesting part are recessed grooves; or the first nesting part and the fourth nesting part are protruding insert blocks, and the second nesting part and the third nesting part are recessed grooves; or the first nesting part and the fourth nesting part are recessed grooves, and the second nesting part and the third nesting part are protruding blocks; or the first nesting part and the second nesting part are recessed grooves, and the third nesting part and the fourth nesting part are protruding blocks.

5. The assembled vertebral body of claim 3, wherein the nested connection is an anti-axial rotation nested connection.

6. The assembled vertebral body of claim 5, wherein the first nesting part, the second nesting part, the third nesting part and the fourth nesting part have a non-circular shape.

7. The assembled vertebral body of claim 6, wherein the non-circular shape is an ellipse or a rounded rectangle.

8. The assembled vertebral body of claim 3, wherein the upper connecting member further comprises a coupling plate and a fixing plate, and wherein the fixing plate is disposed at an upper part of the coupling plate, and the first nesting part is disposed at a lower part of the coupling plate.

9. The assembled vertebral body of claim 8, wherein the fixing plate is T-shaped.

10. The assembled vertebral body of claim 9, wherein two fixing wings, bent inward at a certain angle, are provided at a left and a right side of the fixing plate, respectively.

11. The assembled vertebral body of claim 10, wherein the fixing plate comprises nail holes symmetrically disposed throughout the fixed wings on both sides of the fixing plate.

12. The assembled vertebral body of claim 11, wherein the nail holes penetrate upwardly from an outer side of the fixed wing to an inner side of the fixed wing at an angle with respect to a horizontal plane.

13. The assembled vertebral body of claim 8, wherein the fixing plate is straight line-shaped.

14. The assembled vertebral body of claim 13, wherein the fixing plate comprises nail holes symmetrically disposed throughout a left side and a right side of the fixing plate.

15. The assembled vertebral body of claim 11, wherein the upper connecting element comprises a locking device disposed around the nail hole.

16. The assembled vertebral body of claim 15, wherein the locking device comprises a locking slot disposed on one side of the nail hole and a locking screw disposed within the locking slot.

17. The assembled vertebral body of claim 8, wherein the lower connecting element further comprises a coupling plate and a fixing plate, and wherein the fixing plate is disposed at the lower part of the coupling plate, and the second nesting part is disposed at the upper part of the coupling plate.

18. The assembled vertebral body of claim 17, wherein the fixing plate is straight line-shaped.

19. The assembled vertebral body of claim 18, wherein the fixing plate comprises nail holes symmetrically disposed throughout the left side and the right side of the fixing plate.

20. The assembled vertebral body of claim 19, wherein the lower connecting element comprises a locking device disposed around the nail hole.

21. The assembled vertebral body of claim 20, wherein the locking device comprises a locking slot disposed on one side of the nail hole and a locking screw disposed within the locking slot.

22. The assembled vertebral body of claim 3, wherein the upper connecting element further comprises a transverse portion, and the first nesting part is disposed at a lower part of the transverse portion.

23. The assembled vertebral body of claim 22, wherein the transverse portion comprises nail holes symmetrically disposed on a left and a right side of a front end surface of the transverse portion, and the nail holes penetrate the front end surface of the transverse portion and an upper end surface of the transverse portion.

24. The assembled vertebral body of claim 23, wherein the transverse portion is straight line-shaped; or the transverse portion is V-shaped or has a shape of a semi-concave sphere, and a left and a right end of the transverse portion project upwards; or the transverse portion is inverted V-shaped or has the shape of a semi-convex sphere, and the left and the right end of the transverse portion project downwards; or the transverse portion is W-shaped, and the left end, the right end and a central portion of the transverse portion project upwards.

25. The assembled vertebral body of claim 22, wherein the lower connecting element further comprises a transition portion and a mating portion, wherein the mating portion is disposed at a lower portion of the transition portion, and the second nesting part is disposed at an upper portion of the transition portion.

26. The assembled vertebral body of claim 25, wherein the mating portion comprises nail holes penetrating a front end surface and a rear end surface of the mating portion.

27. The assembled vertebral body of claim 26, wherein the nail holes are symmetrically and horizontally arranged; or the nail holes are symmetrically and vertically arranged; or the nail holes symmetrically arranged in a triangle.

28. The assembled vertebral body of claim 1, wherein an upper surface of the upper connecting element and/or a lower surface of the lower connecting element are/is provided with a small-tooth structure.

29. The assembled vertebral body of claim 1, wherein the upper connecting element and/or the artificial vertebral body element and/or the lower connecting element is a hollow structure or a solid structure.

30. The assembled vertebral body of claim 29, wherein the hollow structure is a bone graft channel.

31. The assembled vertebral body of claim 1, wherein the upper surface of the upper connecting element and/or the lower surface of the lower connecting element are/is provided with a biological hydroxyapatite coating.

32. The assembled vertebral body of claim 1, wherein a surface of the upper connecting element and/or a surface of the artificial vertebral body element and/or a surface of the lower connecting element is a polished structure.

33. The assembled vertebral body of claim 1, wherein a spongy microporous structure is distributed on the surface of the upper connecting element and/or on the surface of the artificial vertebral body element and/or on the surface of the lower connecting element.

34. The assembled vertebral body of claim 1, wherein a front end surface and/or a rear end surface of the upper connecting element is a polished structure, and the rest of surfaces are distributed with the spongy microporous structure; and/or the front end surface and/or the rear end surface of the artificial vertebral body element is the polished structure, and the rest of the surfaces are distributed with the spongy microporous structure; and/or the front end surface and/or the rear end surface of the lower connecting element is the polished structure, and the rest of the surfaces are distributed with the spongy microporous structure.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0079] The accompanying drawings, together with the specification, illustrate exemplary embodiments of the present disclosure, and, together with the description, serve to explain the principles of the present invention.

[0080] FIG. 1A is a front view of the upper connecting element of a first preferred embodiment of the present invention;

[0081] FIG. 1B is a rear view of the upper connecting element;

[0082] FIG. 1C is a top view of the upper connecting element;

[0083] FIG. 1D is a bottom view of the upper connecting element;

[0084] FIG. 1E is a side view of the upper connecting element;

[0085] FIG. 1F is a perspective view of the upper connecting element.

[0086] FIG. 2A is a front view of the artificial vertebral body element of the first preferred embodiment of the present invention;

[0087] FIG. 2B is a top view (bottom view) of the artificial vertebral body element;

[0088] FIG. 2C is a perspective view of the artificial vertebral body element.

[0089] FIG. 3A is a front view of the lower connecting element of the first preferred embodiment of the present invention;

[0090] FIG. 3B is a rear view of the lower connecting element;

[0091] FIG. 3C is a top view of the lower connecting element;

[0092] FIG. 3D is a bottom view of the lower connecting element;

[0093] FIG. 3E is a side view of the lower connecting element; and

[0094] FIG. 3F is a perspective view of the lower connecting element.

[0095] FIG. 4A is a schematic view of a first alternative embodiment of the upper connecting element of the first preferred embodiment of the present invention;

[0096] FIG. 4B is a schematic view of a second alternative embodiment of the upper connecting element;

[0097] FIG. 4C is a schematic view of a third alternative embodiment of the upper connecting element.

[0098] FIG. 5A is a perspective view of a first alternative embodiment of the artificial vertebral body element of the first preferred embodiment of the present invention observed from the top;

[0099] FIG. 5B is a perspective view of the first alternative embodiment of the artificial vertebral body element observed from the bottom;

[0100] FIG. 5C is a perspective view of a second alternative embodiment of the artificial vertebral body element observed from the top;

[0101] FIG. 5D is a perspective view of the second alternative embodiment of the artificial vertebral body element observed from the bottom;

[0102] FIG. 5E is a perspective view of a third alternative embodiment of the artificial vertebral body element of the first preferred embodiment observed from the top;

[0103] FIG. 5F is a perspective view of the third alternative embodiment of the artificial vertebral body element observed from the bottom;

[0104] FIG. 5G is a perspective view of a fourth alternative embodiment of the artificial vertebral body element observed from the top;

[0105] FIG. 5H is a perspective view of the fourth alternative from the top;

[0106] FIG. 6A is a schematic view of a first alternative embodiment of the lower connecting element of the first preferred embodiment of the present invention;

[0107] FIG. 6B is a schematic view of a second alternative embodiment of the lower connecting element;

[0108] FIG. 6C is a schematic embodiment of the lower connecting element.

[0109] FIG. 7A is a schematic view of an assembly process in sequence of the first preferred embodiment of the present invention.

[0110] FIG. 7B is a schematic view of an assembly process in sequence of the first preferred embodiment of the present invention.

[0111] FIG. 7C is a schematic view of an assembly process in sequence of the first preferred embodiment of the present invention.

[0112] FIG. 8A is a front view of the upper connecting element of a second preferred embodiment of the present invention;

[0113] FIG. 8B is a rear view of the upper connecting element;

[0114] FIG. 8C is a side view of the upper connecting element;

[0115] FIG. 8D is a perspective view of the upper connecting element.

[0116] FIG. 9A is a front view of the lower connecting element of a second preferred embodiment of the present invention;

[0117] FIG. 9B is a rear view of the lower connecting element;

[0118] FIG. 9C is a perspective view of the lower connecting element.

[0119] FIG. 10A is a schematic view of an assembly process in sequence of a second preferred embodiment of the present invention.

[0120] FIG. 10B is a schematic view of an assembly process in sequence of a second preferred embodiment of the present invention.

[0121] FIG. 10C is a schematic view of an assembly process in sequence of a second preferred embodiment of the present invention.

[0122] FIG. 11A is a front view of the upper connecting element of a third preferred embodiment of the present invention;

[0123] FIG. 11B is a rear view of the upper connecting element;

[0124] FIG. 11C is a top view of the upper connecting element;

[0125] FIG. 11D is a bottom view of the upper connecting element;

[0126] FIG. 11E is a side view of the upper connecting element; and

[0127] FIG. 11F is a perspective view of the upper connecting element.

[0128] FIG. 12A is a schematic view of a first alternative embodiment of the upper connecting element of the third preferred embodiment of the present invention;

[0129] FIG. 12B is a schematic view of a second alternative embodiment of the upper connecting element;

[0130] FIG. 12C is a schematic view of a third alternative embodiment of the upper connecting element.

[0131] FIG. 13A is a schematic view of an assembly process in sequence of a third preferred embodiment of the present invention.

[0132] FIG. 13B is a schematic view of an assembly process in sequence of a third preferred embodiment of the present invention.

[0133] FIG. 13C is a schematic view of an assembly process in sequence of a third preferred embodiment of the present invention.

[0134] FIG. 14A is a front view of the upper connecting element of a fourth preferred embodiment of the present invention;

[0135] FIG. 14B is a rear view of the upper connecting element;

[0136] FIG. 14C is a perspective view of the upper connecting element.

[0137] FIG. 15A is a schematic view of an assembly process in sequence of a fourth preferred embodiment of the present invention.

[0138] FIG. 15B is a schematic view of an assembly process in sequence of a fourth preferred embodiment of the present invention.

[0139] FIG. 15C is a schematic view of an assembly process in sequence of a fourth preferred embodiment of the present invention.

[0140] FIG. 16A is a front view of the upper connecting element of a fifth preferred embodiment of the present invention;

[0141] FIG. 16B is a rear view of the upper connecting element;

[0142] FIG. 16C is a top view of the upper connecting element;

[0143] FIG. 16D is a bottom view of the upper connecting element;

[0144] FIG. 16E is a side view of the upper connecting element; and

[0145] FIG. 16F is a perspective view of the upper connecting element.

[0146] FIG. 17A is a front view of the artificial vertebral body element of the fifth preferred embodiment of the present invention;

[0147] FIG. 17B is a top view (bottom view) of the artificial vertebral body element;

[0148] FIG. 17C is a perspective view of the artificial vertebral body element.

[0149] FIG. 18A is a front view of the lower connecting element of the fifth preferred embodiment of the present invention;

[0150] FIG. 18B is a rear view of the lower connecting element;

[0151] FIG. 18C is a top view of the lower connecting element;

[0152] FIG. 18D is a bottom view of the lower connecting element;

[0153] FIG. 18E is a side view of the lower connecting element; and

[0154] FIG. 18F is a perspective view of the lower connecting element.

[0155] FIG. 19A is a schematic view of a first alternative embodiment of the upper connecting element of the fifth preferred embodiment of the present invention;

[0156] FIG. 19B is a schematic view of a second alternative embodiment of the upper connecting element;

[0157] FIG. 19C is a schematic view of a third alternative embodiment of the upper connecting element;

[0158] FIG. 19D is a schematic view of a fourth alternative embodiment of the upper connecting element.

[0159] FIG. 20A is a perspective view of a first alternative embodiment of the artificial vertebral body element of the fifth preferred embodiment of the present invention observed from the top;

[0160] FIG. 20B is a perspective view of the first alternative embodiment of the artificial vertebral body element observed from the bottom;

[0161] FIG. 20C is a perspective view of a second alternative embodiment of the artificial vertebral body element observed from the top;

[0162] FIG. 20D is a perspective view of the second alternative embodiment of the artificial vertebral body element observed from the bottom;

[0163] FIG. 20E is a perspective view of a third alternative embodiment of the artificial vertebral body element of the first preferred embodiment observed from the top;

[0164] FIG. 20F is a perspective view of the third alternative embodiment of the artificial vertebral body element observed from the bottom.

[0165] FIG. 21A is a schematic view of a first alternative embodiment of the lower connecting element of the fifth preferred embodiment of the present invention;

[0166] FIG. 21B is a schematic view of a second alternative embodiment of the lower connecting element of the fifth preferred embodiment of the present invention;

[0167] FIG. 21C is a schematic view of a third alternative embodiment of the lower connecting element of the fifth preferred embodiment of the present invention;

[0168] FIG. 21D is a schematic view of a fourth alternative embodiment of the lower connecting element of the fifth preferred embodiment of the present invention;

[0169] FIG. 21E is a schematic view of a fifth alternative embodiment of the lower connecting element of the fifth preferred embodiment of the present invention;

[0170] FIG. 21F is a schematic view of a sixth alternative embodiment of the lower connecting element of the fifth preferred embodiment of the present invention.

[0171] FIG. 22A is a schematic view of an assembly process in sequence of the fifth preferred embodiment of the present invention.

[0172] FIG. 22B is a schematic view of an assembly process in sequence of the fifth preferred embodiment of the present invention.

[0173] FIG. 22C is a schematic view of an assembly process in sequence of the fifth preferred embodiment of the present invention.

LIST OF REFERENCE NUMERALS

[0174] upper connecting element 1, artificial vertebral body element 2, lower connecting element 3, coupling plate 11, fixing plate 12, first nesting part 13, fixed wing 14, nail hole 15, bone graft channel 16, locking slot 17, locking screw 18, transverse portion 19, third nesting part 21, fourth nesting part 22, bone graft channel 23, coupling plate 31, fixing plate 32, second nesting part 33, nail hole 34, bone graft channel 35, locking slot 36, locking screw 37, transition portion 38; mating portion 39.

DETAILED DESCRIPTION

[0175] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals refer to like elements throughout.

[0176] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms a, an and the are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms comprises and/or comprising, or includes and/or including or has and/or having when used herein, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.

[0177] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0178] As used herein, around, about or approximately shall generally mean within 20 percent, preferably within 10 percent, and more preferably within 5 percent of a given value or range. Numerical quantities given herein are approximate, meaning that the term around, about or approximately can be inferred if not expressly stated.

[0179] As used herein, the term plurality means a number greater than one.

[0180] Hereinafter, certain exemplary embodiments according to the present disclosure will be described with reference to the accompanying drawings.

[0181] An assembled vertebral body of the present invention, used in a vertebral body reconstruction operation, comprising: an upper connecting element, an artificial vertebral body element and a lower connecting element, wherein the upper connecting element is detachably disposed at an upper part of the artificial vertebral body element, the lower connecting element is detachably disposed at an lower part of the artificial vertebral body element.

[0182] When the artificial vertebral body element is assembled with the upper connecting element and the lower connecting element, respectively, these elements can be assembled by a plurality of assembling methods, such as by bolting and nesting.

[0183] In the present invention, the preferred assembling method is a nested connection.

[0184] In order to facilitate the assembly of the upper connecting element, the artificial vertebral body element and the lower connecting element, each element comprises a part for nesting.

[0185] The upper connecting element comprises a first nesting part disposed at a lower part of the upper connecting element.

[0186] The lower connecting element comprises a second nesting part disposed at an upper part of the lower connecting element.

[0187] The artificial vertebral body element comprises a third nesting part disposed at the upper part of the artificial vertebral body element, and a fourth nesting part disposed at the lower part of the artificial vertebral body element.

[0188] When the artificial vertebral body element is assembled with the upper connecting element and the lower connecting element, respectively, the first nesting part of the upper connecting element is nestedly connected with the third nesting part of the artificial vertebral body element, and the second nesting part of the lower connecting element is nestedly connected with the fourth nesting part of the artificial vertebral body element.

[0189] There are two nesting parts nestedly connected within each other, one of which is a protruding nesting part and the other is a recessed nesting part.

[0190] Accordingly, the following four methods of nested connections can be obtained:

[0191] 1. The first nesting part of the upper connecting element is a protruding block, the second nesting part of the lower connecting element is the protruding block, and the third nesting part and the fourth nesting part of the artificial vertebral body element are recessed grooves.

[0192] 2. The first nesting part of the upper connecting element is a recessed groove, the second nesting part of the lower connecting element is a recessed groove, and the third nesting part and the fourth nesting part of the artificial vertebral body element are protruding blocks.

[0193] 3. The first nesting part of the upper connecting element is a protruding block, the second nesting part of the lower connecting element is a recessed groove, and the third nesting part of the artificial vertebral body element is a recessed groove, and the fourth nesting part of the artificial vertebral body element is a protruding block.

[0194] 4. The first nesting part of the upper connecting element is a recessed groove, the second nesting part of the lower connecting element is a protruding block, and the third nesting part of the artificial vertebral body element is a protruding block, and the fourth nesting part of the artificial vertebral body element is a recessed groove.

[0195] It is convenient to switch among 4 nested connections through the above different nesting methods, for example, it is possible to switch the method from 1 to 3 or 4, and from 2 to 3 or 4, and vice versa, which greatly improves the versatility of the parts.

[0196] In the vertebral body reconstruction operation, in order to prevent axial rotation of the vertebral body after the operation, the shape of the nesting parts of each element is a non-circular shape, and the non-circular shape can effectively prevent the axial rotation of each element.

[0197] After being tested and optimized, in the present invention, the shape of each nesting part is an ellipse or a rounded rectangle. The above two shapes can reduce the complexity of making vertebral bodies and facilitate rapid and large-scale production.

[0198] The present invention will be described in detail with reference to the following embodiments.

Embodiment 1

[0199] In a preferred embodiment of the present invention, an assembled vertebral body comprises an upper connecting element 1, an artificial vertebral body element 2 and a lower connecting element 3.

[0200] As shown in FIG. 1A-1F, FIG. 1A is a front view of the upper connecting element 1; FIG. 1B is a rear view of the upper connecting element 1; FIG. 1C is a top view of the upper connecting element 1; FIG. 1D is a bottom view of the upper connecting element 1; FIG. 1E is a side view of the upper connecting element 1; and FIG. 1F is a perspective view of the upper connecting element 1. The upper connecting element 1 comprises a coupling plate 11, a fixing plate 12, and a first nesting part 13, wherein the fixing plate 12 is disposed at an upper part of the coupling to plate 11, and the first nesting part 13 is disposed at a lower part of the coupling plate 11.

[0201] The coupling plate 11 has an elliptical shape, and an upper surface thereof is coated with a layer of biological hydroxyapatite coating using a plasma oxidation technique and is distributed with a small-tooth structure

[0202] The coupling plate 11 may be a hollow structure or a solid structure.

[0203] In this embodiment, the coupling plate 11 is a hollow structure. The hollow structure is a bone graft channel 16, and the bone graft channel is disposed in a middle of the coupling plate 11, such that bones coming into contact with the coupling plate may grow into the bone graft channel 16.

[0204] The fixing plate 12 is arranged on one side of an upper surface of the coupling plate 11. The fixing plate 12 is T-shaped. As shown in FIG. 1A, the upper connecting element 1 is I-shaped. As shown in FIG. 1E, the upper connecting element 1 is ]-shaped.

[0205] Two fixed wings 14, bent inward at a certain angle, are provided at a left and a right side of the fixing plate 12, respectively. Nail holes 15 are symmetrically disposed throughout a left and a right side of the fixing wings 14, and the nail holes 15 penetrate upwardly through the fixed wings 14 from an outer side of the fixing plate 12 to an inner side of the fixing plate 12 at an angle with respect to a horizontal plane.

[0206] The fixed wings 14 bend inward at an angle of 00-90, more preferably of 30-60, more preferably of 40-50, and most preferably of 45.

[0207] The angle between each of the nail holes 15 and the horizontal plane ranges from 0 to 90, preferably from 10 to 60, more preferably from 20 to 50, more preferably from 30 to 40.

[0208] The first nesting part 13, which is in the shape of an ellipse, is a recesses groove.

[0209] As shown in FIG. 2A-2C, FIG. 2A is a front view of the artificial vertebral body element 2; FIG. 2B is a top view (bottom view) of the artificial vertebral body element 2; FIG. 2C is a perspective view of the artificial vertebral body element 2. The artificial vertebral body element 2 comprises a third nesting part 21 and a fourth nesting part 22, and both the third nesting part 21 and the fourth nesting part 22 are protruding blocks. The artificial vertebral body element 2 is cross-shaped.

[0210] The artificial vertebral body element 2 is in the shape of an ellipse, and the third nesting part 21 and the fourth nesting part 22 are also in the shape of an ellipse.

[0211] The artificial vertebral body element 2 may be a hollow structure or a solid structure.

[0212] In this embodiment, the artificial vertebral body element 2 is a hollow structure. The hollow structure is a bone graft channel 23, and the bone graft channel 23 is disposed in a middle of the artificial vertebral body element 2.

[0213] As shown in FIG. 3A-3F, FIG. 3A is a front view of the lower connecting element 3; FIG. 3B is a rear view of the lower connecting element 3; FIG. 3C is a top view of the lower connecting element 3; FIG. 3D is a bottom view of the lower connecting element 3; FIG. 3E is a side view of the lower connecting element 3; and FIG. 3F is a perspective view of the lower connecting element 3. The lower connecting element 3 comprises a coupling plate 31, a fixing plate 32, and a second nesting part 33, wherein the fixing plate 32 is disposed at a lower part of the coupling plate 31, and the second nesting part 33 is disposed at an upper part of the coupling plate 31.

[0214] The coupling plate 31 has an elliptical shape, and a lower surface thereof is coated with a layer of biological hydroxyapatite coating using a plasma oxidation technique and is distributed with a small-tooth structure

[0215] The coupling plate 31 may be a hollow structure or a solid structure.

[0216] In this embodiment, the coupling plate 31 is a hollow structure. The hollow structure is a bone graft channel 35, and the bone graft channel 35 is disposed in a middle of the coupling plate 31, such that bones coming into contact with the coupling plate may grow into the bone graft channel 35.

[0217] The fixing plate 32 is arranged on one side of a lower surface of the coupling plate 31. The fixing plate 31 is straight line-shaped. As shown in FIG. 3A, the lower connecting element 1 is -shaped. As shown in FIG. 3E, the lower connecting element 1 is L-shaped.

[0218] Two nail holes 34 are symmetrically and horizontally disposed at the left and right side of the fixing plate 32.

[0219] The upper connecting element 1 and the lower connecting element 3 are standard part, and the artificial vertebral body element 2 is a non-standard part. The term standard part means that the upper connecting element 1 and the lower connecting element 3 can be mass-produced and need not to be redesigned according to patient's health condition. The term non-standard part means that the artificial vertebral body element 2 needs to be designed according to the patient's health condition and made by 3D printing. Specifically, the length of the artificial vertebral body element 2 needs to be designed.

[0220] In this embodiment, the upper connecting element 1, the artificial vertebral body element 2 and the lower connecting element 3 are not limited to the above-mentioned embodiments.

[0221] The upper connecting element 1 of the present embodiment has following various embodiments:

[0222] Embodiment 1, as shown in FIG. 4A, the first nesting part 13 of the upper connecting element 1 is a protruding block, and the first nesting to part 13 is elliptical;

[0223] Embodiment 2, as shown in FIG. 4B, the first nesting part 13 of the upper connecting element 1 is a recessed groove, and the first nesting part 13 has a rounded rectangle shape;

[0224] Embodiment 3, as shown in FIG. 4C, the first nesting part 13 of the upper connecting element 1 is a protruding block, and the first nesting part 13 has a rounded rectangle shape. In addition, the coupling plate 11 is a solid structure without the bone graft channel 16.

[0225] The artificial vertebral body element 2 of the present embodiment has following various embodiments:

[0226] Embodiment 1, as shown in FIG. 5A-5B, FIG. 5A is a perspective view of the artificial vertebral body element 2 observed from the top; FIG. 5B is a perspective view of the artificial vertebral body element 2 observed from the bottom. Both the third nesting part 21 and the fourth nesting part 22 are recessed grooves. The artificial vertebral body element 2 is H-shaped, and both the third nesting part 21 and the fourth nesting part 22 are elliptic;

[0227] Embodiment 2, as shown in FIG. 5C-5D, FIG. 5C is a perspective view of the artificial vertebral body element 2 observed from the top; FIG. 5D is a perspective view of the artificial vertebral body element 2 observed from the bottom. The third nesting part 21 of the artificial vertebral body element 2 is a protruding block, and the fourth nesting part 22 of artificial vertebral body element 2 is a recessed groove. Both the third nesting part 21 and the fourth nesting part 22 are elliptic;

[0228] Embodiment 3, as shown in FIG. 5E-5F, FIG. 5E is a perspective view of the artificial vertebral body element 2 observed from the top; FIG. 5F is a perspective view of the artificial vertebral body element 2 observed from the bottom. Both the third nesting part 21 and the fourth nesting part 22 of the artificial vertebral body element 2 are protruding blocks. The artificial vertebral body element 2 is cross-shaped, and both the third nesting part 21 and the fourth nesting part 22 have a rounded rectangle shape;

[0229] Embodiment 4, as shown in FIG. 5G-5H, FIG. 5G is a perspective view of the artificial vertebral body element 2 observed from the top; FIG. 5H is a perspective view of the artificial vertebral body element 2 observed from the bottom. Both the third nesting part 21 and the fourth nesting part 22 of the artificial vertebral body element 2 are recessed grooves. The artificial vertebral body element 2 is H-shaped, and both the third nesting part 21 and the fourth nesting part 22 have a rounded rectangle shape. In addition, the artificial vertebral body element 2 is a solid structure without the bone graft channel 23.

[0230] The lower connecting element 3 of the present embodiment has following various embodiments:

[0231] Embodiment 1, as shown in FIG. 6A, the second nesting part 33 of the lower connecting element 3 is a protruding block, and the second nesting part 33 is elliptical;

[0232] Embodiment 2, as shown in FIG. 6B, the second nesting part 33 of the lower connecting element 3 is a recesses groove, and the second nesting part 33 has a rounded rectangle shape;

[0233] Embodiment 3, as shown in FIG. 6C, the second nesting part 33 of the lower connecting element 3 is a protruding block, and the second nesting part 33 has a rounded rectangle shape. In addition, the coupling plate 31 is a solid structure without the bone graft channel 35.

[0234] As shown in FIG. 7A-7C, the assembly process of the assembled vertebral body in this embodiment is as follows: a corresponding artificial vertebral body element 2 is designed according to the second cervical vertebrae structure of the patient and made by 3D printing; the artificial vertebral body made by 3D printing is assembled with the upper connecting element 1 and the lower connecting element 3, respectively; the assembled vertebral body is implanted into the operation site of the patient, and the upper connecting element 1 and the lower connecting element 3 are respectively fixed to the adjacent vertebral body by screws, finally, the vertebral body implantation is completed. Since the upper connecting element 1 has inwardly bent fixed wings, the upper connecting element 1 is capable of wrapping the vertebral body connected thereto; the upper surface of the coupling plate of the upper connecting element 1 and the lower surface of the coupling plate of the lower connecting element 3 are both provided with a small-tooth structure and can be attached to the adjacent vertebral bodies; the upper surface of the coupling plate of the upper connecting element 1 and the lower surface of the lower connecting element 3 are coated with a biological hydroxyapatite coating, so that the upper connecting element 1 and the lower connecting element 3 are respectively fused with the adjacent vertebral bodies; since the middle portion of the upper connecting element 1, of the artificial vertebral body element 2 and of the lower connecting element 3 are all provided with bone graft channels, bone to be grafted can be inserted therein, which facilitates the bone to be grown into the adjacent vertebral bodies.

Embodiment 2

[0235] In a preferred embodiment of the present invention, an assembled vertebral body comprises an upper connecting element 1, an artificial vertebral body element 2 and a lower connecting element 3.

[0236] In this embodiment, the artificial vertebral body element 2 is the same as the artificial vertebral body element 2 of Embodiment 1, and the upper connecting element 1 is different from the upper connecting element 1 of Embodiment 1, and the lower connecting element 3 is different from the lower connecting element 3 of Embodiment 1.

[0237] The difference between the upper connecting element 1 of the present embodiment and the upper connecting element 1 of Embodiment 1 is that the fixing plate of the upper connecting element 1 of this embodiment further comprises a locking device.

[0238] The difference between the lower connecting element 3 of the present embodiment and the lower connecting element 3 of Embodiment 1 is that the fixing plate of the lower connecting element 3 of this embodiment further comprises a locking device.

[0239] As shown in FIG. 8A-8D, FIG. 8A is a front view of the upper connecting element 1; FIG. 8B is a rear view of the upper connecting element 1; and FIG. 8C is a side view of the upper connecting element 1; and FIG. 8D is a perspective view of the upper connecting element 1. The locking device is disposed outside the fixed wing 14 and is disposed around the nail hole 15, and the locking device comprises a locking slot 17 and a locking screw 18, wherein the locking slot 17 does not penetrate the fixed wing 14. The locking screw 18 is in the shape of an arch, and the arch consists of a subtense and a corresponding arc, and the angle of the arc is greater than 270 and less than 360. In an unlocked state, the distance between the subtense edge of the locking screw 18 and a center of the nail hole 15 is less than the distance between the arc edge of the locking screw 18 and the center of the nail hole 15; in a locked state, the distance between the subtense edge of the locking screw 18 and the center of the nail hole 15 is greater than the distance between the arc edge of the locking screw 18 and the center of the nail hole 15.

[0240] As shown in FIG. 9A-9C, FIG. 9A is a front view of the lower connecting element 3; FIG. 9B is a rear view of the lower connecting element 3; and FIG. 9C is a perspective view of the lower connecting element 3. The locking device is disposed outside the fixing plate 32 and is disposed around the nail hole 34, and the locking device comprises a locking slot 36 and a locking screw 37, wherein the locking slot 37 does not penetrate the fixing plate 32. The locking screw 37 is in the shape of an arch, and the arch consists of a subtense and a corresponding arc, and the angle of the arc is greater than 270 and less than 360. In an unlocked state, the distance between the subtense edge of the locking screw 37 and a center of the nail hole 34 is less than the distance between the arc edge of the locking screw 37 and the center of the nail hole 34; in a locked state, the distance between the subtense edge of the locking screw 37 and the center of the nail hole 34 is greater than the distance between the arc edge of the locking screw 37 and the center of the nail hole 34.

[0241] As shown in FIG. 10A-10C, the assembly process of the assembled vertebral body in this embodiment are as follows: a corresponding artificial vertebral body element 2 is designed according to the second cervical vertebrae structure of the patient and made by 3D printing; the artificial vertebral body 2 made by 3D printing is assembled to with the upper connecting element 1 and the lower connecting element 3, respectively; the assembled vertebral body is implanted into the operation site of the patient, and the upper connecting element 1 and the lower connecting element 3 are respectively fixed to the adjacent vertebral body by screws; then, the locking screw 18 of the upper connecting element 1 is rotated by 180, and the locking screw 37 of the lower connecting element 3 is rotated by 180, and lock the screw in the corresponding nail hole; finally, the vertebral body implantation is completed. Since the upper connecting element 1 has inwardly bent fixed wings, the upper connecting element 1 is capable of wrapping the vertebral body connected thereto; the upper surface of the coupling plate of the upper connecting element 1 and the lower surface of the coupling plate of the lower connecting element 3 are both provided with a small-tooth structure and can be attached to the adjacent vertebral bodies; the upper surface of the coupling plate of the upper connecting element 1 and the lower surface of the lower connecting element 3 are coated with a biological hydroxyapatite coating, so that the upper connecting element 1 and the lower connecting element 3 are respectively fused with the adjacent vertebral bodies; since the middle portion of the upper connecting element 1, of the artificial vertebral body element 2 and of the lower connecting element 3 are all provided with bone graft channels, bone to be grafted can be inserted therein, which facilitates the bone to be grown into the adjacent vertebral bodies; by arranging the locking device around the nail hole, implanted screws will not easily fall off, thereby improving the stability.

Embodiment 3

[0242] In a preferred embodiment of the present invention, an assembled vertebral body comprises an upper connecting element 1, an artificial vertebral body element 2 and a lower connecting element 3.

[0243] In this embodiment, the artificial vertebral body element 2 is the same as the artificial vertebral body element 2 of Embodiment 1, the lower connecting element 3 is the same as the lower connecting element 3 of Embodiment 1, and the upper connecting element 1 is different from the upper connecting element 1 of Embodiment 1.

[0244] The difference between the upper connecting element 1 of the present embodiment and the upper connecting element 1 of Embodiment 1 is that the fixing plate 12 of the upper connecting element 1 of this embodiment is straight line-shaped, and the upper connecting element 1 of the present embodiment does not have the inwardly bent fixed wing 14.

[0245] As shown in FIG. 11A-11F, FIG. 11A is a front view of the upper connecting element 1; FIG. 11B is a rear view of the upper connecting element 1; FIG. 11C is a top view of the upper connecting element 1; FIG. 11D is a bottom view of the upper connecting element 1; FIG. 11E is a side view of the upper connecting element 1; and FIG. 11F is a perspective view of the upper connecting element 1. The upper connecting element 1 comprises a coupling plate 11, a fixing plate 12, and a first nesting part 13, wherein the fixing plate 12 is disposed at the upper part of the coupling plate 11, and the first nesting part 13 is disposed at the lower part of the coupling plate 11.

[0246] The coupling plate 11 has an elliptical shape, and an upper surface thereof is coated with a layer of biological hydroxyapatite coating using a plasma oxidation technique and is distributed with a small-tooth structure.

[0247] The coupling plate 11 may be a hollow structure or a solid structure.

[0248] In this embodiment, the coupling plate 11 is the hollow structure. The hollow structure is a bone graft channel 16, and the bone graft channel is disposed in a middle portion of the coupling plate 11, such that bones coming into contact with the coupling plate may grow into the bone graft channel 16.

[0249] The fixing plate 12 is arranged on one side of an upper surface of the coupling plate 11. The fixing plate 12 is straight line-shaped. As shown in FIG. 11A, the upper connecting element 1 is -shaped. As shown in FIG. 11E, the upper connecting element 1 is L-shaped.

[0250] Two through nail holes 15 are symmetrically and horizontally disposed on a left and a right side of the fixing plate 12.

[0251] The upper connecting element 1 of the present embodiment has following various embodiments:

[0252] Embodiment 1, as shown in FIG. 12A, the first nesting part 13 of the upper connecting element 1 is a protruding block, and the first nesting part 13 is elliptical;

[0253] Embodiment 2, as shown in FIG. 12B, the first nesting part 13 of the upper connecting element 1 is a recessed groove, and the first nesting part 13 has a rounded rectangle shape;

[0254] Embodiment 3, as shown in FIG. 12C, the first nesting part 13 of the upper connecting element 1 is a protruding block, and the first nesting part 13 has a rounded rectangle shape. In addition, the coupling plate 11 is a solid structure without the bone graft channel 16.

[0255] As shown in FIG. 13A-13C, the assembly process of the assembled vertebral body in this embodiment are as follows: a corresponding artificial vertebral body element 2 is designed according to the second cervical vertebrae structure of the patient and made by 3D printing; the artificial vertebral body 2 made by 3D printing is assembled with the upper connecting element 1 and the lower connecting element 3, respectively; the assembled vertebral body is implanted into the operation site of the patient, and the upper connecting element 1 and the lower connecting element 3 are respectively fixed to the adjacent vertebral body by screws, finally, the vertebral body implantation is completed. The upper surface of the coupling plate of the upper connecting element 1 and the lower surface of the coupling plate of the lower connecting element 3 are both provided with a small-tooth structure and can be attached to the adjacent vertebral bodies; the upper surface of the coupling plate of the upper connecting element 1 and the lower surface of the lower connecting element 3 are coated with a biological hydroxyapatite coating, so that the upper connecting element 1 and the lower connecting element 3 are respectively fused with the adjacent vertebral bodies; since the middle portion of the upper connecting element 1, of the artificial vertebral body element 2 and of the lower connecting element 3 are all provided with bone graft channels, bone to be grafted can be inserted therein, which facilitates the bone to be grown into the adjacent vertebral bodies.

Embodiment 4

[0256] In a preferred embodiment of the present invention, an assembled vertebral body comprises an upper connecting element 1, an artificial vertebral body element 2 and a lower connecting element 3.

[0257] In this embodiment, the artificial vertebral body element 2 is the same as the artificial vertebral body element 2 of Embodiment 2, the lower connecting element 3 is the same as the lower connecting element 3 of Embodiment 2, and the upper connecting element 1 is different from the upper connecting element 1 of Embodiment 2.

[0258] The difference between the upper connecting element 1 of the present embodiment and the upper connecting element 1 of Embodiment 3 is that the fixing plate 12 of the upper connecting element 1 of this embodiment is straight line-shaped, and the upper connecting element 1 of the present embodiment does not have the inwardly bent fixed wing 14.

[0259] As shown in FIG. 14A-14C, FIG. 14A is a front view of the upper connecting element 1; FIG. 14B is a rear view of the upper connecting element 1; FIG. 14C is a perspective view of the upper connecting element 1. The upper connecting element 1 comprises a coupling plate 11, a fixing plate 12, and a first nesting part 13, wherein the fixing plate 12 is disposed at the upper part of the coupling plate 11, and the first nesting part 13 is disposed at the lower part of the coupling plate 11.

[0260] The coupling plate 11 has an elliptical shape, and an upper surface thereof is coated with a layer of biological hydroxyapatite coating using a plasma oxidation technique and is distributed with a small-tooth structure.

[0261] The coupling plate 11 may be a hollow structure or a solid structure.

[0262] In this embodiment, the coupling plate 11 is the hollow structure. The hollow structure is a bone graft channel 16, and the bone graft channel is disposed in a middle portion of the coupling plate 11, such that bones coming into contact with the coupling plate may grow into the bone graft channel 16.

[0263] The fixing plate 12 is arranged on one side of an upper surface of the coupling plate 11. The fixing plate 12 is straight line-shaped. As shown in FIG. 11A, the upper connecting element 1 is -shaped. As shown in FIG. 11E, the upper connecting element 1 is L-shaped.

[0264] Two nail holes 15 are symmetrically and horizontally disposed on a left and a right side of the fixing plate 12.

[0265] As shown in FIG. 15A-15C, the assembly process of the assembled vertebral body in this embodiment are as follows: a corresponding artificial vertebral body element 2 is designed according to the second cervical vertebrae structure of the patient and made by 3D printing; the artificial vertebral body 2 made by 3D printing is assembled with the upper connecting element 1 and the lower connecting element 3, respectively; the assembled vertebral body is implanted into the operation site of the patient, and the upper connecting element 1 and the lower connecting element 3 are respectively fixed to the adjacent vertebral body by screws; then, the locking screw 18 of the upper connecting element 1 is rotated by 180, and the locking screw 37 of the lower connecting element 3 is rotated by 180, and lock the screw in the corresponding nail hole; finally, the vertebral body implantation is completed. Since the upper connecting element 1 has inwardly bent fixed wings, the upper connecting element 1 is capable of wrapping the vertebral body connected thereto; the upper surface of the coupling plate of the upper connecting element 1 and the lower surface of the coupling plate of the lower connecting element 3 are both provided with a small-tooth structure and can be attached to the adjacent vertebral bodies; the upper surface of the coupling plate of the upper connecting element 1 and the lower surface of the lower connecting element 3 are coated with a biological hydroxyapatite coating, so that the upper connecting element 1 and the lower connecting element 3 are respectively fused with the adjacent vertebral bodies; since the middle portion of the upper connecting element 1, of the artificial vertebral body element 2 and of the lower connecting element 3 are all provided with bone graft channels, bone to be grafted can be inserted therein, which facilitates the bone to grown into the adjacent vertebral bodies; by arranging the locking device around the nail hole, implanted screws will not easily fall off, thereby improving the stability.

Embodiment 5

[0266] In a preferred embodiment of the present invention, an assembled vertebral body comprises an upper connecting element 1, an artificial vertebral body element 2 and a lower connecting element 3.

[0267] As shown in FIG. 16A-16F, FIG. 16A is a front view of the upper connecting element 1; FIG. 16B is a rear view of the upper connecting element 1; FIG. 16C is a top view of the upper connecting element 1; FIG. 16D is a bottom view of the upper connecting element 1; FIG. 16E is a side view of the upper connecting element 1; and FIG. 16F is a perspective view of the upper connecting element 1. The upper connecting element 1 comprises a transverse portion 19 and a first nesting part 13, wherein the first nesting part 13 is disposed at a lower part of the transverse portion 19.

[0268] The transverse portion 19 comprises two nail holes 15 symmetrically disposed on a left and a right side of a front end surface of the transverse portion 19, and the nail holes 15 penetrate the front end surface of the transverse portion 19 and an upper end surface of the transverse portion 19.

[0269] The transverse portion 19 is V-shaped or has a shape of a semi-concave sphere, and a left and a right end of the transverse portion 19 project upwards, and the assembled vertebral body is Y-shaped.

[0270] A front end surface and/or a rear end surface of the transverse portion 19 is a polished structure, and the rest of surfaces are distributed with the spongy microporous structure.

[0271] The front surface of the transverse portion 19 is a matte surface.

[0272] The transverse portion 19 may be a hollow structure or a solid structure.

[0273] In this embodiment, the transverse portion 19 is a hollow structure. The hollow structure is a bone graft channel 16, and the bone graft channel 16 is disposed in a middle portion of the transverse portion 19, that is, penetrating through the upper end surface and the lower end surface of the transverse portion 19.

[0274] The first nesting part 13 is a protruding block, and the first nesting part 13 is elliptical.

[0275] As shown in FIG. 17A-17C, FIG. 17A is a front view of the artificial vertebral body element 2; FIG. 17B is a top view (bottom view) of the artificial vertebral body element 2; and FIG. 17C is a perspective view of the artificial vertebral body element 2. The artificial vertebral body element 2 comprises a third nesting part 21 and a fourth nesting part 22, wherein both the third nesting part 21 and the fourth nesting part 22 are recessed grooves, and the artificial vertebral body element 2 is H-shaped.

[0276] The artificial vertebral body element 2 may be a hollow structure or a solid structure.

[0277] In this embodiment, the artificial vertebral body element 2 is a hollow structure. The hollow structure is a bone graft channel 23, and the bone graft channel 23 is disposed in a middle portion of the artificial vertebral body element 2, that is, penetrating through the upper end surface and the lower end surface of the artificial vertebral body element 2.

[0278] A front end surface and/or a rear end surface of the artificial vertebral body element 2 is a polished structure, and the rest of surfaces are distributed with the spongy microporous structure.

[0279] The third nesting part 21 and the fourth nesting part 22 are elliptic.

[0280] As shown in FIG. 18A-18F, FIG. 18A is a front view of the lower connecting element 3; FIG. 18B is a rear view of the lower connecting element 3; FIG. 18C is a top view of the lower connecting element 3; FIG. 18D is a bottom view of the lower connecting element 3; FIG. 18E is a side view of the lower connecting element 3; and FIG. 18F is a perspective view of the lower connecting element 3. The lower connecting element 3 comprises a transition portion 38, a mating portion 39 and a second nesting part 33, wherein, the second nesting part 33 is disposed at an upper portion of the transition portion 38, and the mating portion 33 is disposed at a lower portion of the transition portion 38.

[0281] The mating portion 39 is provided on the outside of the lower portion of the transition portion 38 and transits smoothly.

[0282] The mating portion 39 comprises nail holes 34 symmetrically and horizontally arranged at a front end surface of the mating portion 39 and penetrating the front end surface and a rear end surface of the mating portion 39.

[0283] A front end surface and/or a rear end surface of the transition portion 38 is a polished structure, and the rest of surfaces are distributed with the spongy microporous structure.

[0284] The lower surface of the transition portion 38 is a matte surface.

[0285] The transition portion 38 may be a hollow structure or a solid structure.

[0286] In this embodiment, the transition portion 38 is the hollow structure. The hollow structure is a bone graft channel 35, and the bone graft channel 35 is disposed in a middle portion of the transition portion 38, that is, penetrating through the upper end surface and the lower end surface of the transition portion 38.

[0287] The second nesting part 33 is a protruding block, and the second nesting part 13 is elliptical.

[0288] A size of the transition portion 38 is equal to the size of the artificial vertebral body element 2.

[0289] A length of the mating portion 39 is equal to the length of 1 to 2 cervical spines, preferably the length of one cervical spine.

[0290] A width of the mating portion 39 is greater than the width of the transition portion 38.

[0291] The width of the transition portion 38 is from 10 mm to 16 mm, and the width of the mating portion 39 is from 12 mm to 22 mm.

[0292] The upper connecting element 1, the artificial vertebral body element 2 and the lower connecting element 3 are all made of a titanium alloy material.

[0293] The lower connecting element 3 is a standard part, while the upper connecting element 1 and the artificial vertebral body element 2 are non-standard parts. The term standard part means that lower connecting element 3 can be mass-produced and need not to be redesigned according to patient's health condition. The term non-standard part means that the upper connecting element 1 and the artificial vertebral body element 2 need to be designed according to the patient's health condition and made by 3D printing. Specifically, the length of the artificial vertebral body element 2 needs to be designed.

[0294] In this embodiment, the upper connecting element 1, the artificial vertebral body element 2 and the lower connecting element 3 of the present embodiment have other embodiments.

[0295] The upper connecting element 1 of the present embodiment has following various embodiments:

[0296] Embodiment 1, as shown in FIG. 19A, the first nesting part 13 of the upper connecting element 1 is a recessed groove, and the first nesting part 13 is elliptical;

[0297] Embodiment 2, as shown in FIG. 19B, the transverse portion 19 of the upper connecting element 1 is straight line-shaped, all the surfaces of the transverse portion 19 are polished structures, and the transverse portion 19 is a solid structure. The first nesting part 13 is a protruding block, and the first nesting part 13 is elliptic, and the assembled vertebral body is T-shaped;

[0298] Embodiment 3, as shown in FIG. 19C, the transverse portion 19 of the upper connecting element 1 is inversed V-shaped or has a shape of a semi-convex sphere, and two ends of the transverse portion 19 project downwards. In addition, the surfaces of the transverse portion 19 are distributed with the spongy microporous structure. The first nesting part 13 is a protruding block, and the assembled vertebral body is t-shaped;

[0299] Embodiment 4, as shown in FIG. 19D, the transverse portion of the upper connecting element 1 is W-shaped. The left end, the right end and a central portion of the transverse portion 19 project upward, and the surfaces of the transverse portion 19 are distributed with the spongy microporous structure. The first nesting part 13 is a protruding block.

[0300] The artificial vertebral body element 2 of the present embodiment has following various embodiments:

[0301] Embodiment 1, as shown in FIG. 20A-20B, FIG. 20A is a perspective view of the artificial vertebral body element 2 observed from the top; FIG. 20B is a perspective view of the artificial vertebral body element 2 observed from the bottom. Both the third nesting part 21 and the fourth nesting part 22 of the artificial vertebral body element 2 are protruding blocks; the artificial vertebral body element 2 is cross-shaped, and both the third nesting part 21 and the fourth nesting part 22 are elliptic; a front end surface and/or a rear end surface of the artificial vertebral body element 2 is a polished structure, and the rest of surfaces are distributed with the spongy microporous structure;

[0302] Embodiment 2, as shown in FIG. 20C-20D, FIG. 20C is a perspective view of the artificial vertebral body element 2 observed from the top; FIG. 20D is a perspective view of the artificial vertebral body element 2 observed from the bottom. Both the third nesting part 21 and the fourth nesting part 22 of the artificial vertebral body element 2 are recessed grooves; the artificial vertebral body element 2 is H-shaped, and both the third nesting part 21 and the fourth nesting part 22 are elliptic; and the surfaces of the artificial vertebral body element 2 are distributed with the spongy microporous structure;

[0303] Embodiment 3, as shown in FIG. 20E-20F, FIG. 20E is a perspective view of the artificial vertebral body element 2 observed from the top; FIG. 20F is a perspective view of the artificial vertebral body element 2 observed from the bottom. Both the third nesting part 21 and the fourth nesting part 22 of the artificial vertebral body element 2 are recessed grooves; the artificial vertebral body element 2 is H-shaped, and both the third nesting part 21 and the fourth nesting part 22 are elliptic; and all the surfaces of the artificial vertebral body element 2 are polished structures.

[0304] The lower connecting element 3 of the present embodiment has following various embodiments:

[0305] Embodiment 1, as shown in FIG. 21A, the second nesting part 33 of the lower connecting element 3 is a recessed groove, and the second nesting part 33 is elliptical;

[0306] Embodiment 2, as shown in FIG. 21B, the second nesting part 33 of the lower connecting element 3 is a protruding block, and the second nesting part 33 is elliptical. All the surfaces of the transition portion 38 of the lower connecting element 3 are polished structures;

[0307] Embodiment 3, as shown in FIG. 21C, the second nesting part 33 of the lower connecting element 3 is a protruding block, and the second nesting part 33 is elliptical. The surfaces of the transition portion 38 of the lower connecting element 3 are distributed with the spongy microporous structure;

[0308] Embodiment 4, as shown in FIG. 21D, the second nesting part 33 of the lower connecting element 3 is a protruding block, the second nesting part 33 is elliptical, and all the surfaces of the transition portion 38 of the lower connecting member 3 are polished structures. The nail hole 34 is symmetrically and vertically disposed on the front end surface of the mating portion 39, and the nail hole 34 penetrates the front end surface of the mating portion 39 and the rear end surface of the mating portion 39;

[0309] Embodiment 5, as shown in FIG. 21E, the second nesting part 33 of the lower connecting element 3 is a protruding block, the second nesting part 33 is elliptical, and all the surfaces of the transition portion 38 of the lower connecting element 3 are polished structures. The nail hole 34 is disposed on the front end surface of the mating portion 39 in an inverted triangle shape, and the nail hole 34 penetrates the front end surface of the mating portion 39 and the rear end surface of the mating portion 39;

[0310] Embodiment 6, as shown in FIG. 21F, the second nesting part 33 of the lower connecting element 3 is a protruding block, the second nesting part 33 is elliptical, and all the surfaces of the transition portion 38 of the lower connecting element 3 are polished structures. The mating portion 39 is arranged inside the lower portion of the transition portion 38. The front end surface of the connection portion between the mating portion 39 and the transition portion 38 is a flat surface.

[0311] As shown in FIG. 22A-22C, the assembly process of the assembled vertebral body in this embodiment are as follows: a corresponding upper connecting element 1 and an artificial vertebral body element 2 are designed according to the second cervical vertebrae structure of the patient and made by 3D printing; the artificial vertebral body 2 made by 3D printing is assembled with the upper connecting element 1 and the lower connecting element 3, respectively; the assembled vertebral body is implanted into the operation site of the patient, and the upper connecting element 1 and the lower connecting element 3 are respectively fixed to the adjacent vertebral body by screws, finally, the vertebral body implantation is completed. By using the oblique upward nail hole 15, the assembled vertebral body can be directly set below the atlas, and implements a bearing-type fixing instead of the traditional encircling fixing, so that the upper end of the transverse portion 19 is in contact with the bottom of the atlas, increasing the contact area between the transverse portion 19 of the atlas and the anterior arch of the atlas or the skull base to form an effective support, which is conducive to bone ingrowth; the transverse portion 19 is fixed by means of a bearing, and screws are positioned on the massa lateralis atlantis or condylus occipitalis from an area below the upper contact area to the area above the two sides, such that the prosthesis can perform occipito-cervical reconstruction after the atlantoaxial resection. The mating portion 39 adopts a cross-fixation system using vertebral body screws and end plate screws, thereby having a good pull-out resistance and anti-rotation ability.

[0312] The above descriptions are only the preferred embodiments of the invention, not thus limiting the embodiments and scope of the invention. Those skilled in the art should be able to realize that the schemes obtained from the content of specification and drawings of the invention are within the scope of the invention.