# US 9,867,711 B2 · Vertebral body spacer

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- Number: US 9,867,711 B2
- Document ID: US9867711B2
- Status: Granted
- Kind: B2
- Application number: 13/884,424
- Filed: 2011-11-09
- Published: 2013-10-17
- Granted: 2018-01-16
- Earliest claimed: 2010-11-10
- Assignees: Mitsubishi Materials Corporation
- Applicants: Toshio Matsumoto; Yuzo Daigo; Shinichi Ohmori; Komei Kato
- Inventors: Toshio Matsumoto; Yuzo Daigo; Shinichi Ohmori; Komei Kato
- Web page: https://patentgrep.com/patent/US9867711B2

## CPC

- A61F 2/442: {Intervertebral or spinal discs, e.g. resilient (non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455)}
- A61F 2/30771: {applied in original prostheses, e.g. holes or grooves}
- A61F 2/4465: {having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine}
- A61F 2/447: {substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section}
- A61F 2002/2817: {Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]}
- A61F 2002/2835: {Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material}
- A61F 2002/30011: {differing in porosity}
- A61F 2002/30433: {using additional screws, bolts, dowels, rivets or washers e.g. connecting screws}
- A61F 2002/30471: {connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type}
- A61F 2002/30593: {hollow}
- A61F 2002/30616: {Sets comprising a plurality of prosthetic parts of different sizes or orientations}
- A61F 2002/30624: {Hinged joint, e.g. with transverse axle restricting the movement}
- A61F 2002/30784: {Plurality of holes}
- A61F 2002/30841: {Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes}
- A61F 2002/3092: {having an open-celled or open-pored structure}
- A61F 2002/30971: {Laminates, i.e. layered products}
- A61F 2002/448: {comprising multiple adjacent spinal implants within the same intervertebral space or within the same vertebra, e.g. comprising two adjacent spinal implants}
- A61F 2310/00023: Titanium or titanium-based alloys, e.g. Ti-Ni alloys
- A61F 2310/00029: Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
- A61F 2310/00089: Zirconium or Zr-based alloys
- A61F 2310/00095: Niobium or Nb-based alloys
- A61F 2310/00131: Tantalum or Ta-based alloys
- 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

A vertebral body spacer of the present invention is used by being inserted between a vertebral body and a vertebral body (intervertebral space). The vertebral body spacer has a block body constituted of titanium or a titanium alloy as a main component thereof, and provided with a pair of contact surfaces to be made contact with the vertebral body and the vertebral body. The block body includes a frame-shaped dense part and a porous part provided inside the dense part, and a porosity of at least a surface of the porous part is larger than a porosity of the dense part. According to the present invention, it is possible to maintain an appropriate size between the vertebral bodies (intervertebral space).

## Claims

### Claim 1

A vertebral body spacer to be used by being inserted between vertebral bodies, comprising;
a pair of block bodies, each block body having a pair of contact surfaces configured to contact the vertebral bodies, and
a connecting portion rotatably connecting the pair of block bodies to each other,
wherein the block body includes a frame-shaped dense part having a porosity of 10 to 40% and a porous part provided inside the dense part, and a porosity of at least a surface of the porous part is larger than a porosity of the dense part, wherein the porous part and the dense part of each block body are constituted of titanium or a titanium alloy as a main component thereof,
wherein the dense part includes a first frame portion configured to contact one of the vertebral bodies and a second frame portion configured to contact the other of the vertebral bodies,
wherein one surface of the pair of contact surfaces is constituted from the first frame portion of the dense part and the porous part, and the other surface of the pair of contact surfaces is constituted from the second frame portion of the dense part and the porous part, and
wherein each surface of the pair of contact surfaces constitutes a flat surface.

### Claim 2 (depends on 1)

The vertebral body spacer as claimed in claim 1, wherein the dense part and the porous part are integrally formed.

### Claim 3 (depends on 1)

The vertebral body spacer as claimed in claim 1, wherein the porous part has a plurality of corner portions, and the dense part is provided along the plurality of corner portions of the porous part.

### Claim 4 (depends on 1)

The vertebral body spacer as claimed in claim 1, wherein the block body is constituted from a polyhedral body defined by a plurality of surfaces including the pair of contact surfaces, and each of the plurality of surfaces constitutes a flat surface.

### Claim 5 (depends on 1)

The vertebral body spacer as claimed in claim 1, wherein a whole of the porous part is constituted from a porous body.

### Claim 6 (depends on 1)

The vertebral body spacer as claimed in claim 1, wherein an osteoinductive factor is carried on the porous part.

### Claim 7 (depends on 1)

The vertebral body spacer as claimed in claim 1, wherein the dense part includes at least one connecting portion connecting the first frame portion and the second frame portion to each other, and wherein the connecting portion serves as a supporting post.

### Claim 8 (depends on 1)

The vertebral body spacer as claimed in claim 1, wherein the block body is constituted from a polyhedral body defined by a plurality of surfaces having the pair of contact surfaces, a first surface connecting the pair of contact surfaces at a front end of the block body and a second surface connecting the pair of contact surfaces at a back end of the block body, and
wherein the first surface and the second surface constitute a flat surface.