Spinal fusion implant having deployable bone engaging projections, instrumentation, and methods for use thereof
OwnerGary K. Michelsoninventor
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Abstract
An interbody spinal fusion implant for implantation at least in part within and across the generally restored height of a disc space between two adjacent vertebral bodies of a human spine having an external housing and a substantially hollow internal rotatable member having bone engaging projections that are deployable through the housing to penetrably engage the adjacent vertebral bodies.
Claims219
An interbody spinal fusion implant for implantation at least in part within and across the generally restored height of a disc space between two adjacent vertebral bodies of a human spine, said spinal implant comprising:
- a housing having a leading end for insertion first into the disc space, a trailing end opposite said leading end, a longitudinal axis between said leading end and said trailing end of said housing, an upper surface adapted to contact one of the adjacent vertebral bodies, a lower surface opposite said upper surface adapted to contact another one of the adjacent vertebral bodies, and a hollow interior configured to hold bone growth promoting material therein, said upper and lower surfaces each having at least one opening therein in communication with said hollow interior and with each other to permit for the growth of bone from adjacent vertebral body to adjacent vertebral body through said housing;
- and
- a substantially hollow internal rotatable member configured to be at least in part within said hollow interior of said housing, said rotatable member having a leading end, a trailing end, a longitudinal axis between said leading end and said trailing end of said rotatable member, a top, a bottom, and an open interior between said top and said bottom, each of said top and said bottom of said rotatable member including at least one bone engaging projection adapted to penetrably engage the bone of the adjacent vertebral bodies by rotating said bone engaging projection about the longitudinal axis of said rotatable member, said top and said bottom including at least one aperture therein in communication with said open interior of said rotatable member and with each other to permit for the growth of bone from vertebral body to vertebral body therethrough, said rotatable member being adapted to rotate at least in part within said hollow interior of said housing between a retracted position and a deployed position, said bone engaging projections extending through said upper and lower surfaces of said housing so as to penetrably engage the bone of the adjacent vertebral bodies when in the deployed position.
A method for inserting an interbody spinal fusion implant at least in part within and across the generally restored height of a disc space between two adjacent vertebral bodies of a human spine, the method comprising the steps of:
- providing the spinal implant having a housing with a longitudinal axis, upper and lower surfaces and a hollow interior with a substantially hollow rotatable member therein having an open interior, openings in communication with the open interior, and bone engaging projections moveable between a retracted position where the bone engaging projections are retracted within the housing and a deployed position where the bone engaging projections extend beyond the upper and lower surfaces of the housing to penetrably engage the adjacent vertebral bodies;
- preparing an implantation space to receive the spinal implant;
- inserting the spinal implant into the implantation space in a linear direction along the longitudinal axis of the implant;
- and
- rotating the rotatable member of the spinal implant from the retracted position to the deployed position to deploy the bone engaging projections to penetrably engage both adjacent vertebral bodies.
The method of claim 8790, wherein the implant provided in said providing step has a height equal to its width.
An apparatus for inserting into a disc space between two adjacent vertebral bodies of the human spine a spinal implant having a housing with a leading end, an opposite trailing end, and a rotatable member therein for deploying bone engaging projections, said apparatus comprising:
- an outer shaft having a leading end and a trailing end, said leading end of said outer shaft being configured to cooperatively engage the trailing end of the housing of the spinal implant;
- a handle at said trailing end of said outer shaft;
- and
- an inner shaft configured to rotate within said outer shaft, said inner shaft having a leading end and a trailing end, said leading end of said inner shaft being configured to cooperatively engage the rotatable member of the implant, said inner shaft rotating the rotatable member with rotation of said inner shaft.
An interbody spinal fusion implant for implantation at least in part within and across the generally restored height of a disc space between two adjacent vertebral bodies of a human spine, said spinal implant comprising:
- a housing having a leading end for insertion first into the disc space, a trailing end opposite said leading end, a longitudinal axis between said leading end and said trailing end of said housing, an upper surface adapted to contact one of the adjacent vertebral bodies, a lower surface opposite said upper surface adapted to contact another one of the adjacent vertebral bodies, and a hollow interior configured to hold bone growth promoting material therein, said upper and lower surfaces each having at least one opening therein in communication with said hollow interior and with each other to permit for the growth of bone from adjacent vertebral body to adjacent vertebral body through said housing;
- and
- at least two internal rotatable members configured to be at least in part within said hollow interior of said housing, said rotatable members each having a leading end, a trailing end, and a longitudinal axis between said leading end and said trailing end of said rotatable member, the longitudinal axis of each of said at least two internal rotatable members being spaced from one another, each of said rotatable members including at least one bone engaging projection adapted to penetrably engage the bone of the adjacent vertebral bodies by rotating said bone engaging projection about the longitudinal axis of each of said rotatable members, respectively, each of said rotatable members being adapted to rotate within said hollow interior of said housing between a retracted position and a deployed position, said bone engaging projections extending through at least one of said upper and lower surfaces of said housing so as to penetrably engage the bone of the adjacent vertebral bodies when in the deployed position.
The implant of claim 181, wherein said upper portion of said bone engaging projection has a decreased distance from said housing proximate said trailing edge when said bone engaging projections are in the deployed position.
An interbody spinal fusion implant for implantation at least in part within and across the generally restored height of a disc space between two adjacent vertebral bodies of a human spine, said spinal implant comprising:
- a housing having a leading end for insertion first into the disc space, a trailing end opposite said leading end, a longitudinal axis between said leading end and said trailing end of said housing, an upper surface adapted to contact one of the adjacent vertebral bodies, a lower surface adapted to contact another one of the adjacent vertebral bodies, and a hollow interior configured to hold bone growth promoting material therein, said upper and lower surfaces each having at least one opening therein in communication with said hollow interior and with each other to permit for the growth of bone from adjacent vertebral body to adjacent vertebral body through said housing;
- and
- an internal rotatable member configured to be at least in part within said hollow interior of said housing, said rotatable member having a leading end, a trailing end, a longitudinal axis between said leading end and said trailing end of said rotatable member, a top, and a bottom, each of said top and said bottom of said rotatable member including a plurality of bone engaging projections spaced apart from one another along the longitudinal axis of said rotatable member, each of said top and said bottom of said rotatable member including at least one aperture therein to permit for the growth of bone from vertebral body to vertebral body through said rotatable member, said bone engaging projections adapted to penetrably engage the bone of the adjacent vertebral bodies by rotating said bone engaging projections about the longitudinal axis of said rotatable member, said rotatable member being adapted to rotate within said hollow interior of said housing between a retracted position and a deployed position, said bone engaging projections extending through said upper and lower surfaces of said housing so as to penetrably engage the bone of the adjacent vertebral bodies when in the deployed position.
Dependencies are inferred from the claim text.