A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
A61F 2/44 (2006.01) A61B 17/16 (2006.01) A61F 2/30 (2006.01) A61F 2/46 (2006.01) A61B 17/88 (2006.01) A61F 2/00 (2006.01) A61F 2/28 (2006.01)
Patent
CA 2072992
A fusion cage (10) having an external thread (12) can be surgically inserted into a threaded bore extending laterally between the adjacent bony structures such as two vertebrae (94, 95) with the thread (12) penetrating into cancellous bone of each of the vertebrae (94, 95). The fusion cage (10) is easily screwed into place by hand without damage to the bony structures (94, 95). Cage (10) is then packed with a bone-growth-inducing substance such as cancellous bone. When a pair of such cages (10) are implanted between adjacent vertebrae (94, 95), patients have been able to sit without pain by the second or third day, much earlier than has been possible in prior spinal fusions except those involving steel plates and screws. Eventually, the ingrowth of bone through perforations (13) in the valley (14) of the thread (12) of the fusion cage (10) forms a permanent interconnection between the two bony structures (94, 95).
Dickhudt Eugene A.
Ray Charles D.
Gowling Lafleur Henderson Llp
Howmedica Osteonics Corp.
Surgical Dynamics Inc.
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