Spinal implant and cutting tool preparation accessory for mounting the implant
AssigneeSDGI Holdings, Inc.
InventorsMingyan Liu, Daniel Chopin, Hans-Jorg Meisel
Life of this patent
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Abstract
This invention relates to a spinal implant for promoting fusion of adjacent vertebrae and restoration of normal disc height. The spinal implant includes an upper and lower surface adapted to engage cancellous bone tissue in the vertebral bodies. The spinal implant also includes at least two opposing bearing surfaces adapted to bear against cortical bone tissue in the endplates of adjacent vertebrae. This invention also provides an instrumentation to prepare the intervertebral space to receive the spinal implant and techniques for treating patents in need of corrective spinal surgery.
Claims28
An implant for insertion between a first vertebra and a second vertebra, the first vertebra having a first cortical bone endplate and the second vertebra having a second cortical bone endplate, wherein the implant comprises:
- a first terminal part defining a first bearing surface substantially planar and adapted to bear against the first cortical bone endplate and an opposite second bearing surface substantially planar and adapted to bear against the second cortical bone endplate;
- a second terminal part opposite said first terminal part, said second terminal part defining a third bearing surface adapted to bear against the first cortical bone endplate and a fourth bearing surface adapted to bear against the second cortical bone endplate;
- and
- an elongated body including a central portion extending from said first terminal part to said second terminal part, said body defining a longitudinal axis and having an upper bearing surface and a lower bearing surface, wherein the upper bearing surface and the second lower bearing surface are arcuate along the longitudinal axis.
An implant for insertion between a first vertebra and a second vertebra, the first vertebra having a generally vertically extending first peripheral wall and a first cortical bone endplate and the second vertebra having a having a generally vertically extending second peripheral wall and a second cortical bone endplate, wherein the implant comprises:
- a first terminal part defining a first bearing surface adapted to bear against a portion of the cortical bone endplate proximate to the first peripheral wall and an opposite second bearing surface adapted to bear against a portion of the second cortical bone endplate proximate to the second peripheral wall,
- an elongated body including a central part extending from said first terminal part, said central part defining a longitudinal axis and having an upper bearing surface and a lower bearing surface wherein the upper bearing surface and the lower bearing surface are arcuate along the longitudinal axis,
- a second terminal part opposite said first terminal part and having an insertion face extending from the first upper bearing surface to the second lower bearing surface wherein said insertion face is provided to ease insertion of the implant between the first vertebra and second vertebra.
A tool for insertion between a first vertebra with a cortical bone endplate and a second vertebra with a second cortical bone endplate, wherein the tool comprises:
- a proximal handle connected to an elongated shaft configured to rotate about a longitudinal axis of the tool;
- an outer sleeve adjacent to the handle and the shaft extending though the conduit and configured to rotate relative thereto;
- a cutting portion fixed to the shaft to rotate therewith, the cutting portion including a pair of generally parallel opposing surfaces, each surface having a first arcuate cutting edge and an opposite second arcuate cutting edge;
- and
- a non-cutting portion fixed to the cutting portion and distal to the handle, wherein the non-cutting portion is configured to align said cutting portion between the cortical bone endplate of the first vertebra and the cortical bone endplate of the second vertebra.
A method of treating a patent having a spinal deformative, wherein said patient includes a first vertebra and a second vertebra, the first vertebra having a generally vertically extending first peripheral wall and a first cortical bone endplate and the second vertebra having a having a generally vertically extending second peripheral wall and a second cortical bone endplate, said method comprising:
- selecting a spinal implant having an elongated body extending from said first terminal part and said second terminal part, said body defining a longitudinal axis and having an upper surface and a lower surface wherein the first upper surface and the second lower surface are arcuate along the longitudinal axis and wherein said implant includes a first bearing surface adapted to bear against a portion of the first cortical bone endplate proximate to the first peripheral wall and an opposite second bearing surface adapted to bear against the second cortical bone endplate proximate to the second peripheral wall;
- and
- surgically implanting the implant between the first vertebra and the second vertebra.
Dependencies are inferred from the claim text.