# US 2014/0194990 A1 · Adjustable complex of artificial cervical vertebra and intervertebral connector

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- Number: US 2014/0194990 A1
- Document ID: US20140194990A1
- Status: Published application
- Kind: A1
- Application number: 14/129,966
- Filed: 2011-06-29
- Published: 2014-07-10
- Earliest claimed: 2011-06-29
- Assignees: Xijing He
- Inventors: Xijing He; Jie Qin
- Web page: https://patentgrep.com/patent/US20140194990A1

## CPC

- A61F 2/4465: {having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine}
- A61F 2/3094: {Designing or manufacturing processes}
- A61F 2002/2835: {Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material}
- A61F 2002/30387: {Dovetail connection}
- A61F 2002/30392: {Rotation}
- A61F 2002/304: {with additional means for limiting said sliding}
- A61F 2002/30507: {using a threaded locking member, e.g. a locking screw or a set screw}
- A61F 2002/30576: {with extending fixation tabs}
- A61F 2002/30578: {having apertures, e.g. for receiving fixation screws}
- A61F 2002/30601: {telescopic}
- A61F 2002/30649: {Ball-and-socket joints}
- A61F 2002/30785: {parallel}
- A61F 2002/30841: {Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes}
- A61F 2310/00023: Titanium or titanium-based alloys, e.g. Ti-Ni alloys
- A61F 2310/00796: Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

An adjustable complex of an artificial cervical vertebra and an intervertebral connector includes: a vertebra body; and two end plates respectively connected to a top end and a bottom end of the vertebra body by spherical joint structures; wherein the vertebra body comprises: an upper vertebra body; and a lower vertebra body; wherein the upper vertebra body is axially connected to the lower vertebra body by a screw thread; a plurality of radial screw holes are correspondingly provided on side surfaces of the upper vertebra body and the lower vertebra body; a length-fixing screw is provided though the radial screw holes of the upper vertebra body and the lower vertebra body; wherein end plate fixing screws are respectively provided on the two end plates. The adjustable complex has a support function of an artificial vertebra and movability of an artificial intervertebral disc.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

An adjustable complex of an artificial cervical vertebra and an intervertebral connector, comprising:
a vertebra body; and
two end plates respectively connected to a top end and a bottom end of said vertebra body by spherical joint structures;
wherein said vertebra body comprises:
an upper vertebra body; and
a lower vertebra body;
wherein said upper vertebra body is axially connected to said lower vertebra body by a screw thread; a plurality of radial screw holes are correspondingly provided on side surfaces of said upper vertebra body and said lower vertebra body; a length-fixing screw is provided though said radial screw holes of said upper vertebra body and said lower vertebra body;
wherein end plate fixing screws are respectively provided on said two end plates.

### Claim 12 (depends on 11)

The adjustable complex, as recited in claim 11, wherein said spherical joint structure comprises:
a joint ball structure mounted on said end plate; and
an acetabulum structure corresponding to said joint ball structure and mounted on an end of said upper vertebra body or said lower vertebra body, wherein an inner space of said acetabulum structure has a cylindrical space at a center thereof and two hemispherical spaces intersecting said cylindrical space; said inner space of said acetabulum structure is big and an opening thereof is small for containing said joint ball structure.

### Claim 13 (depends on 12)

The adjustable complex, as recited in claim 12, wherein said end plate comprises:
a disc, wherein said joint ball structure is vertically mounted on an internal surface of said disc, two said end plate fixing screws are mounted on an external surface of said disc at an edge far away from said joint ball structure by two adjacent screw holes; a predetermined angel is provided between an axial direction of said end plate fixing screw and a plane of said disc.

### Claim 14 (depends on 13)

The adjustable complex, as recited in claim 13, wherein said external surface of said disc has a matting-like rough structure, and is coated by a biological hydroxyapatite layer.

### Claim 15 (depends on 14)

The adjustable complex, as recited in claim 14, wherein a thickness of said hydroxyapatite layer is 20 μm, a toothed structure with a size of 20 μm is provided on a rear portion of said external surface of said disc.

### Claim 16 (depends on 13)

The adjustable complex, as recited in claim 13, wherein said disc is thinner at which said end plate fixing screw is mounted on and thicker at which said joint ball structure is mounted on; said disc has a sliced surface when observed from a side, said sliced surface extends from a center line of said disc to a bottom front for forming said sliced surface with an angle of 10°, in such a manner that said end plate forms an inclined surface with an angle of 80° with adjacent said upper vertebra body and forms an inclined surface with an angle of 100° with adjacent said lower vertebra body.

### Claim 17 (depends on 14)

The adjustable complex, as recited in claim 14, wherein said disc is thinner at which said end plate fixing screw is mounted on and thicker at which said joint ball structure is mounted on; said disc has a sliced surface when observed from a side, said sliced surface extends from a center line of said disc to a bottom front for forming said sliced surface with an angle of 10°, in such a manner that said end plate forms an inclined surface with an angle of 80° with adjacent said upper vertebra body and forms an inclined surface with an angle of 100° with adjacent said lower vertebra body.

### Claim 18 (depends on 15)

The adjustable complex, as recited in claim 15, wherein said disc is thinner at which said end plate fixing screw is mounted on and thicker at which said joint ball structure is mounted on; said disc has a sliced surface when observed from a side, said sliced surface extends from a center line of said disc to a bottom front for forming said sliced surface with an angle of 10°, in such a manner that said end plate forms an inclined surface with an angle of 80° with adjacent said upper vertebra body and forms an inclined surface with an angle of 100° with adjacent said lower vertebra body.

### Claim 19 (depends on 11)

The adjustable complex, as recited in claim 11, wherein an external screw thread is provided on a down neck of said upper vertebra body, a barrel structure with an internal screw thread is provided on a top portion of said lower vertebra body; said down neck of said upper vertebra body is screwed into said internal screw thread of said lower vertebra body through said external screw thread; a plurality of radial screw through-holes are evenly distributed on said upper vertebra body and said lower vertebra body in an axial direction, said length-fixing screw is screwed into said radial screw through-holes for fixing a relative axial position of said upper vertebra body and said lower vertebra body.

### Claim 20 (depends on 11)

The adjustable complex, as recited in claim 11, wherein a minimum length of said adjustable complex is 23 mm, a maximum length thereof is 29 mm, an adjustable range is 6 mm.

### Claim 21 (depends on 19)

The adjustable complex, as recited in claim 19, wherein a minimum length of said adjustable complex is 23 mm, a maximum length thereof is 29 mm, an adjustable range is 6 mm.

### Claim 22 (depends on 11)

The adjustable complex, as recited in claim 11, wherein a 20 μm-thick biological hydroxyapatite layer treated by a plasma oxidation technology is coated on an external surface of said lower vertebra body.

### Claim 23 (depends on 19)

The adjustable complex, as recited in claim 19, wherein a 20 μm-thick biological hydroxyapatite layer treated by a plasma oxidation technology is coated on an external surface of said lower vertebra body.

### Claim 24 (depends on 11)

The adjustable complex, as recited in claim 11, wherein a front end of said end plate fixing screw is a pointed end, a rear end of said end plate fixing screw is a nut; a portion close to said nut is slightly thicker than a portion close to said pointed end.