| 摘要 |
The present invention expands a spinal (3) canal by drilling a cylindrical passage (7) in each pedicle (2) of a vertebra (1), making a circumferential pedicle cut (osteotomy) (11) through each pedicle (2) from within the passage (7), separating each pedicle cut (11) by inserting an implant (16) into the passage (7) which distracts the pedicle cut (11) to expand the spinal canal (3), and securing each pedicle cut (11), allowing the vertebra (1) to heal with the spinal canal (3) expanded. The implant (16) includes an outer sleeve (17), an inner bolt (18), and expandable flanges (21). The outer sleeve (17) includes an upper portion (19) and a lower portion (20), with the expandable flanges (21) connected to the lower portion (20) and housed within the upper portion (19). Rotation of the inner bolt (18) causes the upper and lower portions (19, 20) of the outer sleeve (17) to separate, causing the pedicle cut (11) to widen and the expandable flanges (21) to radially extend into and stabilize the widened pedicle cut (11) to effectuate expansion of the spinal canal (3). |
