Bionic dislocation-proof artificial lumbar vertebrae and disc complex

Abstract

The bionic dislocation-proof artificial lumbar vertebrae and disc complex comprises vertebral body components, intervertebral disc components and screws; the vertebral body components comprise an oval column; the intervertebral disc components comprise L-shaped arc plates and composite pads, the L-shaped arc plates comprise bottom plates, lateral plate and the raised column; end of the raised column is the ball shell with two raised arc; the composite pad is connected to the groove on the oval column; the ball shell and the composite ball form the ball and socket joint. The present invention replaces the removed vertebrae and adjacent discs and maintains the rotation, flexion and extension and buffer function, which ensures the stability and mobility of the lumbar spine after surgery. The present invention better resembles the normal physiology.

Claims

1. A bionic dislocation-proof artificial lumbar vertebrae and disc complex, comprising: vertebral body components and intervertebral disc components on two ends of the vertebral body components; wherein the intervertebral disc components comprise L-shaped arc plates (3) and composite pads (4), the L-shaped arc plates (3) comprise bottom plates (18) and lateral plate (10) which match endplates and sides of the lumbar vertebras respectively; wherein the lateral plate (10) are on the bottom plates (18); the bottom plates (18) are connected to the composite pads (4) by ball and socket joints; wherein the vertebral body components comprises oval columns (1); there are grooves (2) on two ends of the oval columns (1); the two composite pads are embedded in the grooves (2) on corresponding ends of the oval columns (1) respectively.

2. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 1, wherein an edge of each of the bottom plates (18) comprises an open ellipse two ends of which are smoothly transit to an M-shaped curve; wherein the open ellipse is symmetrically along a minor axis of a corresponding ellipse; each of the lateral plate (10) is on the open ellipse at the edge of each of the bottom plates (18); each of the lateral plate (10) tilts inwardly and form an angle of 70-80 degree with a corresponding bottom plate (18); there are screw holes (11) on each of the lateral plate (10).

3. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 2, wherein there are an oval top and conic teeth (6) on the bottom plates (18); the oval top (5), the conic teeth (6) and one of the lateral plate (10) are on a same side of the corresponding bottom plate (18); a center of the oval top (5) is coincide with a center of the corresponding bottom plate (18); a height of the oval top (5) diminishes from a center to an edge; the conic teeth (6) are distributed along an ellipse edge of the oval top at intervals on the corresponding bottom plate (18).

4. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 2, wherein there are two screw holes (11) which are on different horizontal planes.

5. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 1, wherein each of the composite pads (4) comprises a lower oval column (13) embedded in a corresponding groove (2) on an end of the oval column (1), an upper oval column (12) on an opening of the groove (2), which is connected to the lower oval column (13), and a composite ball acts as an articular head of the ball and socket joint; wherein an arc groove (14) with a round opening is on the upper oval column (12); the arc groove (14) extends to the lower oval column (13); the composite ball is in the arc groove (14); there is a gap between the composite ball and the upper oval column (12); there is a ball shell in the gap to match with the composite ball as an articular nest; the ball shell is connected to a raised column (7) on each of the bottom plates (18).

6. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 5, wherein there are two raised arcs (8) on an opening edge of the ball shell; the two raised arcs (8) are opposite to each other; two notches (16) are on a wall of the arc groove (14); the two notches (16) are opposite to each other; a distance between exterior walls of the two raised arcs (8) is not bigger than a distance between the two notches (16) and bigger than a diameter of the round opening of the arc groove (14).

7. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 6, wherein the two raised arc (8) are symmetrical along a sagittal plane; the two notches (16) are symmetrical along a coronal plane.

8. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 5, wherein the raised column (7) comprises a bigger column (20) which is connected to the bottom plate (18) and a smaller column (21) which is connected the bigger column (20); the ball shell is connected to the smaller column(21); a centre line of the bigger column (20) coincides with a centre line of the smaller column (21); an edge of the bigger column (20) and the smaller column (21) contact area is rounded; a top of the composite ball is higher than the upper oval column (12); an outer edge of the upper oval column (12) and a corresponding side of the bottom plate (18) is rounded; an inner edge of the upper oval column (12) is a tapered enlargement.

9. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 1, wherein there are a certain number of round grooves randomly distributed on the oval column (1); two rectangle through grooves (25) are crossed on a center of the oval column (1); the two rectangle through grooves (25) travel along a sagittal plane and a coronal plane respectively.

10. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 1, wherein the oval column (1), the L-shaped arc plate (3) and the composite pad (4) are integrated into one body; the oval column (1) and the L-shaped arc plate (3) adopt medical titanium alloy; the composite pad (4) adopts UHMWPE (ultra-high molecular weight polyethylene) or PEEK (polyetheretherketone); hydroxylapatite coating is applied on a contact area of the L-shaped arc plate (3) and bones and a flank of the oval column (1).

11. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 1, wherein there is an arc concave A (28) on a side of the oval column (1) which goes through the oval column (1) along an axial direction; there is an arc concave B (29) on a side of a lower oval column (13) which goes through the lower oval column along an axial direction; the arc concave A (28) and the arc concave B (29) are in a same shape.

12. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 1, wherein there is a limit groove (30) on a side of a lower oval column (13) of each of the composite pads (4); a sawtooth structure A (31) is on an internal wall of the limit groove (30); the limit groove (30) is symmetrical along a mid-sagittal plane of the lower oval column (13) and passes through the arc groove (14); a limit composite pad (32) is inside the limit groove (30); a first side of the limit composite pad (32) matches a composite ball (15); a second side of the limit composite pad (32) matches an exterior wall of each of the composite pads (4); a sawtooth structure B (33) is on a side of the limit composite pad (32); the sawtooth structure B (33) matches the sawtooth structure A (31); the limit groove (30) acts with the limit composite pad (32) to form a limit component.

13. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 12, wherein a size of the limit groove (30) and the limit composite pad (32) is adjustable.

14. The bionic dislocation-proof artificial lumbar vertebrae and disc complex, as recited in claim 12, wherein the limit composite pad (32) adopts medical UHMWPE or PEEK.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG. 1 is a front view of the present invention;

[0032] FIG. 2 is a rear view of the present invention;

[0033] FIG. 3 is a side view of the present invention;

[0034] FIG. 4 is a top view of the present invention;

[0035] FIG. 5 is a bottom view of the present invention;

[0036] FIG. 6 is a profile along a coronal plane;

[0037] FIG. 7 is a profile along a sagittal plane;

[0038] FIG. 8 is an isometric view of an L-shaped arc plate;

[0039] FIG. 9 is an isometric view of a composite pad;

[0040] FIG. 10 is an isometric view of vertebral body components;

[0041] FIG. 11 is a Schematic diagram shows parameters of the L-shaped arc plate;

[0042] FIG. 12 is a Schematic diagram shows parameters of the composite pad;

[0043] FIG. 13 is a perspective view of an implant of a bionic dislocation-proof artificial lumbar vertebrae and disc complex;

[0044] FIG. 14 is an isometric view of the vertebral body components in another embodiment;

[0045] FIG. 15 is an isometric view of the composite pad in another embodiment;

[0046] FIG. 16 is a top view of a limit composite pad;

[0047] FIG. 17 is a cross-section of a ball and socket joint;

[0048] Element number: 1. oval column; 2. groove; 3. L-shaped arc plate; 4. composite pad; 5. oval top; 6. conic teeth; 7. raised column; 8. raised arc; 9. ball shell; 10. lateral plate; 11. screw hole; 12. upper oval column; 13. lower oval column; 14. arc groove; 15. the composite ball; 16. notch; 17. top edge of upper oval column; 18. bottom plate; 19. bottom plate back edge; 20. bigger column; 21. smaller column; 22. edge of bigger column and smaller column contact area; 23. arc groove opening; 24. small round groove; 25. rectangle through groove; 26. column groove; 27. screw; 28. arc concave A; 29. arc concave B; 30. limit groove; 31. sawtooth structure A; 32. limit composite pad; 33. sawtooth structure B.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0049] Referring to the drawings, according to a preferred embodiment of the present invention is illustrated in detail.

[0050] Referring to FIG. 1 to FIG. 10 and FIG. 14 to FIG. 17, the bionic dislocation-proof artificial lumbar vertebrae and disc complex comprises lumbar vertebrae components, intervertebral disc components and screws 27; wherein the vertebral body components comprise an oval column 1 with grooves 2 on top and bottom ends; there is an arc concave 28 which passes through the oval column 1 along the axis; small round grooves 24 are randomly distributed on the side of the oval column; two rectangle through grooves 25 are in the middle of oval column 1; the two rectangle grooves travel along the a sagittal plane and coronal plane respectively; the small round groove promotes the surrounding tissue attachment; the two rectangle through grooves 25 are able to contain implanted bones; two column grooves 26 is set symmetrically on top and bottom ends of the opening of the rectangle through groove along the coronal plane, which are convenient for the surgeon to hold the complex while surgery; the intervertebral disc components comprise L-shaped arc plates 3 which are connected to the adjacent vertebral body and composite pads 4 which are connected to the vertebral body components, the L-shaped arc plates 3 comprise bottom plates 18, lateral plate 10 and raised column 7; the bottom plate 18 is in a super-oval shape; a bottom plate back edge 19 is rounded; an oval top 5 and conic sawteeth 6 are set on a contact area of the bottom plate and an adjacent endplates; a center of the oval top 5 coincides with a center of the bottom plate 18; a height of the oval top diminishes from the center to the edge; the conic sawteeth 6 are evenly distributed along the oval edge on the bottom plate 18 at intervals; the raised column 7 is on the oval center of a relative area of the bottom plate 18 and the composite pad 4; the raised column 7 comprises a bigger column 20 which is near the bottom plate 18 and a smaller column 21 which is away from the bottom plate 18; a centre line of the bigger column 20 and the smaller column 21 are coincided; the edge of the contact area of the bigger column and the smaller column 22 is rounded; the end of the smaller column 21 comprises a ball shell 9 with two raised arcs 8; the raised arcs are distributed symmetrically on two sides of the ball shell along a sagittal plane; the cross section of the lateral plate 10 is a quarter of an oval; the lateral plate 10 is on the left front edge of the bottom plate 18 and gradually tilts inward; two screw holes 11 which are not at the same level are set on the lateral plate 10; the L-shaped arc plate 3 is firmly fixed on the sides of the adjacent vertebras by screws 27; the composite pad 4 comprises upper and lower oval column; there is an arc groove 14 around the centre line of the upper column 12; an arc concave B 29 passes through the lower oval column along an axis; the shape of an arc concave A 28 on a side of the oval column 1 is same as the arc concave B 29; a limit groove 30 is on the side of the lower column 13; sawtooth structure A 31 is on an internal wall of the limit groove 30; the limit groove 30 is symmetrically distributed along a mid-sagittal plane of the lower column 13 and passes through arc groove 14; a limit composite pad 32 is in the limit groove; a first side of the composite pad 32 matches the composite ball 15; a second side of the composite pad 32 matches an exterior wall of the composite pad; the sawtooth structure B 33 is on a side of the limit composite pad 32; the sawtooth structure B 33 matches the sawtooth structure A 31 on the internal wall of the limit groove 30 to prevent the limit component from loose and dislocation; the limit groove 30 matches the limit composite pad 32 to form the limit component; a size of the limit groove 30 and the limit composite pad 32 is adjustable; the rotation range of the ball and socket joint along the axis is adjusted the size of the limit groove 30 and the limit composite pad 32, wherein the rotation range of the ball and socket joint is 0-90; the inner wall of the arc groove 14 is an the composite ball structure; two notches 16 are on the front and back of the outer wall of the arc groove 14; the two notches 16 are symmetrically distributed on the outer wall of the arc groove 14 along the coronal plane; the top of the the composite ball 15 on the inner wall of the arc groove 14 is higher than the upper oval column 12; the opening of the arc groove 14 is a tampered enlargement which ensures flexion and extension while limit excessive motion; an outer diameter of the opening of the arc groove 14 is smaller than the distance between an exterior wall of the two raised arcs 8 on the sub-hemisphere ball shell; the distance between the notches 16 is same as the distance between the exterior wall of the two raised arcs 8; the two raised arcs 8 is able to be set in the arc groove 14; the raised arcs are rotated away from the notches to embed the limit composite pad 32 in the lower column 13 by the limit groove 30, which prevents the dislocation of the ball shell 9 from the arc groove 14 and limit the rotation range of the ball and socket joint; The stability of the ball and socket joint is guaranteed and the facet joint and surrounding soft tissue injuries caused by excessive rotation are avoided; the lower oval column 13 of the composite pad 4 is in the groove 2 on the oval column 1, which effectively prevents the dislocation of the composite pad 4 from the groove; the top edge of the upper oval column 17 is rounded; the ball shell 9 matches the composite ball 15 to form the ball and socket joint which ensures the rotation, lateral bending, flexion and extension function after the surgery; the screws 27 is in screw holes; the lower oval column of the composite pad is connected to the groove 2 of the vertebral body components which ensures the stability of the bionic artificial lumbar vertebrae and disc complex.

[0051] Referring to FIG. 6 and FIG. 7, the arc groove 14 is the space for placing the ball shell 9.

[0052] The vertebral body components, the L-shaped arc plate 3 and the screws 27 adopt medical titanium alloy and are integrated into one body. The hydroxylapatite coating is applied on the contact area (such as the top of the bottom plate and the internal surface of the lateral plate) between the L-shaped arc plate 3 and the cortical bone and the sides of the vertebral body components, which ensure the stability after the surgery. The composite pad 4 adopts UHMWPE (ultra-high molecular weight polyethylene) or PEEK (polyetheretherketone) and is integrated into one body. The limit composite pad 32 also adopts UHMWPE or PEEK. The inner and outer wall of the arc groove 14 and the inner and outer wall of ball shell 9 are polished, which effectively reduce friction on the contact area.

[0053] Referring to the FIG. 10, the height of the oval column 1 is 26 mm; the semi-major axis of the oval is 23 mm; the semi-minor axis is 15 mm; the depth of the grooves on two end of the oval column 1 is 10 mm; the semi-major axis of the groove is 21 mm; the semi-minor axis of the groove is 13 mm; the opening of the two rectangle through groove 25 on the side of the oval column 1 is 3 mm*15 mm; the depth of the small round grooves 24 which are distributed randomly on the oval column 1 is 1 mm; the radius of the small round grooves 24 is 1 mm; the depth of column groove 26 is 1.5 mm; the radius of the column groove 26 is 1.5 mm.

[0054] Referring to the FIG. 8 and the FIG. 11, the thickness of the bottom plate 18 of the L-shaped arc plate 3 is about 2 mm; the bottom plate 18 is in a super-oval shape with an arc of 225; the semi-major axis of the oval is 23 mm; the semi-minor axis of the oval is 18 mm; the bottom plate back edge is rounded with a radius of 5 mm; the height of the center of the oval top 5 on the bottom plate 18 is 2 mm; the height of the oval top 5 diminishes from the center to the edge; the semi-major axis of the oval top 5 is 15 mm; the semi-minor axis of the oval top 5 is 10 mm; the center of the oval top 5 coincides with the center of the bottom plate 18; the height of the conic teeth 6 on the bottom plate is 0.5 mm; the radius of the bottom of the conic teeth 6 is 0.25 mm (part of the conic teeth are illustrated in the drawings); the thickness of the lateral plate 10 on the L-shaped arc plate is about 2 mm; the cross-section of the lateral plate 10 is a quarter of an oval; the height of the lateral plate 10 is 12 mm; the lateral plate 10 tilt inwardly and form an angle of 70-80 degree with a corresponding bottom plate 18; the radius of the screw hole 11 is 2 mm; the height of the raised column 7 is 5 mm; the height of the bigger column 20 is H1=2 mm; the height of the smaller column 21 is H2=3 mm; the radius of the bigger column is 10 mm; the radius of the smaller column is 7 mm; the edge of the contact area of the bigger column and smaller column is rounded with a radius of 1 mm; the thickness of the ball shell at the end of the smaller column is about 2 mm; the internal radius of the ball shell is 8.1 mm; the distance between the plane of the opening of the ball shell and the top of the ball shell is D1=5.1 mm; the distance between the bottom plane of the two raised arcs 8 and opening plane of the ball shell is D2=3 mm; the width of each of the raised arcs 8 is W1=6.8 mm.

[0055] Referring to the FIG. 9 and the FIG. 12, the height of the upper oval column 12 on the composite pad 4 is 3 mm; the height of the lower oval column 13 is H3=10 mm; the semi-major axis of the upper oval column 12 is 23 mm; the semi-minor axis of the upper oval column 12 is 15 mm; the semi-major axis of the lower oval column 13 is 21 mm; the semi-minor axis of the lower oval column 13 is 13 mm; the top edge of the upper oval column is rounded with a radius of 2 mm; the width of the arc groove 14 is 2.0 mm; the depth of the arc groove 14 is H4=9 mm; the diameter of the composite ball is 1=16 mm; the top of the composite ball is higher than the upper oval column 12 by a distance of D3=2 mm; the opening of the arc groove is a tapered enlargement with a taper height of 3 mm; the opening and the end of the upper oval column form an angle of 75 degree (); the depth of each of the notches 16 on the front and back of the arc groove is H5=5.3 mm; the width of each of the notches 16 is 7 mm.

[0056] The thickness of the hydroxylapatite coating is 20 m.

[0057] The parameters are adjustable according to the size of the lumbar vertebrae of the patients.

[0058] Referring to the FIG. 13, the bionic dislocation-proof artificial lumbar vertebrae disc complex is assembled in the following way, wherein the lower oval column 13 of the composite pad 4 is placed in the groove 2 of the oval column 1; the ball shell 9, the raised arc 8 and the arc groove 14 form the dislocation-proof ball and socket joint; the contact areas of the ball and socket joint are highly polished to reduce the friction and abrasion while the joint motions; the L-shaped arc plate 3 is fixed on the adjacent vertebras by the screws 27 and the screw holes 11; the shape of the bottom plate 18 of the L-shaped arc is similar to the endplates; the oval top 15 matches the concave of the endplates; the conic teeth 6 further fix the bottom plate 18 on the adjacent endplates; the lateral plate 10 expands the contact area with the adjacent vertebra, effectively reduces the stress concentration and guarantee the bearing function of the lumbar vertebrae; the rectangle through grooves 25 are on the oval column 1 and the small round grooves 24 are randomly distributed on the oval column 1, which promotes the surrounding tissue attachment and growth; the long-term stability of the spine after the surgery is thus ensured. The dislocation-proof ball and socket joint guarantees the stability of the intervertebral disc after the implant, prevents the dislocation of the prothesis and limits the rotation range of the prothesis along the axis. The rotation, lateral bending, flexion and extension function of the lumbar spine are maintained, which better resembles the normal physiology.

[0059] The bionic dislocation-proof artificial lumbar vertebrae and disc complex disclosed comprises a vertebral body components, intervertebral disc components and screws 27; wherein the vertebral body components comprise an oval column 1 with grooves 2 on top and bottom ends; small round grooves 24 are randomly distributed on and two rectangle through grooves 25 are in the oval column 1; the intervertebral disc components comprise L-shaped arc plates 3 which are connected to the adjacent lumbar vertebra and composite pads 4 which are connected to the vertebral body components, the L-shaped arc plates 3 comprise bottom plates 18, lateral plate 10 and raised column 7; an oval top 5 and conic sawteeth 6 are on the bottom plate; two screw holes 11 which are on different planes are set on the lateral plate 10; the end of the raised column 7 is a ball shell 9 with two raised arcs 8; each of the composite pads 4 comprises upper and lower oval column; the lower oval column 13 is in the groove of the oval column 1; an arc groove 14 is around the centre line of the upper column 12; the inner side of the arc groove 14 is the composite ball 15; the ball shell and the composite ball on the upper oval column form the ball and socket joint; the joint surface is polished and the contact area with bone is hydroxylapatite coated. The present invention replaces the removed vertebrae and adjacent discs and maintains the rotation, flexion and extension and buffer function, which ensures the stability and mobility of the spine after surgery. The present invention better resembles the normal physiology.