Two piece spinal jack incorporating varying mechanical and fluidic lift mechanisms for establishing a desired spacing between succeeding vertebrae
An insert for establishing a desired spacing between a pair of succeeding vertebrae and having a body including an extending end for supporting a location associated with a first selected lumbar vertebrae. An opposite extending end supports a spaced apart and opposing location associated with a second successively positioned lumbar vertebrae. Upon pre-positioning the body in an open space established between the vertebrae, an actuating input causes the first extending end to displace outwardly relative to the second end and into contacting support with the vertebrae.
1. An expandable spinal jack adapted for insertion between succeeding spinal vertebrae, comprising:
assembleable upper and lower portions, each portion exhibiting a concave exterior configured for seating against an opposing location of an articular process associated with first and second successive vertebrae;
an annular projection integrally formed with and downwardly extending from an underside of said upper portion, said annular projection being received in seating fashion within an annular aligning sleeve extending upwardly from said lower portion;
a plurality of coil springs seating within the annular aligning sleeve, said coil springs influencing an underside of said annular projection in an upward direction; and
an adjustment mechanism established within an enclosed interior surrounded by said annular aligning sleeve and projection, said adjustment mechanism including a first component extending downwardly from said upper portion and a second component extending upwardly from said lower component in length adjustable engagement with said first component,
wherein said first component includes at least one stem, said stem including seating portions integrally formed on an underside of said stem, said second component including a rotatable step ring having stem engagement locations formed in a stepped pattern, wherein rotation of said step ring causes upward reseating of said stem in order to define a range of separation distances between said upper and lower portions.
2. An expandable spinal jack adapted for insertion between succeeding spinal vertebrae, comprising:
assembleable upper and lower portions, each portion exhibiting a concave exterior configured for seating against an opposing location of an articular process associated with first and second successive vertebrae, said upper and lower portions further having opposing stem portions;
a flexible and supporting membrane encircling a perimeter of said upper and lower portions, said membrane and said upper and lower portions collectively defining an enclosed interior, said membrane including an upper edge secured along a side extending perimeter of said upper portion and a lower edge secured along a side extending perimeter of said lower portion; and
a pair of opposing wedge blocks supported within said enclosed interior, each of said wedge blocks exhibiting angled surfaces which mate with angled surfaces on said opposing stem portions, said membrane permitting manipulation of said wedge block in an laterally displacing fashion against said stem portions in order to separate said upper and lower portions in height adjusting fashion, said membrane flexing in response to outward displacement between the upper and lower portions.
3. An expandable spinal jack adapted for insertion between succeeding spinal vertebrae, comprising:
assembleable upper and lower portions, each portion exhibiting a concave exterior configured for seating against an opposing location of an articular process associated with first and second successive vertebrae, said upper and lower portions further having opposing stem portions;
a flexible and supporting membrane encircling a perimeter of said upper and lower portions, said membrane and said upper and lower portions collectively defining an enclosed interior, said membrane including an upper edge secured along a side extending perimeter of said upper portion and a lower edge secured along a side extending perimeter of said lower portion;
a wedge block supported within said enclosed interior, said wedge block exhibiting angled surfaces which mate with angled surfaces on said opposing stem portions; and
an end stop defined at a side wall location of said lower portion within said enclosed interior, said end stop defining a maximum lateral displacement of said wedge block,
said membrane permitting manipulation of said wedge block in a laterally displacing fashion against said stem portions in order to separate said upper and lower portions in height adjusting fashion, said membrane flexing in response to outward displacement between the upper and lower portions.