Percutaneous technique and implant for expanding the spinal...

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/70 (2006.01) A61B 17/14 (2006.01) A61B 17/16 (2006.01) A61B 17/22 (2006.01)

Patent

CA 2479743

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).

La présente invention permet de dilater un canal vertébral (3) par le forage d'un passage (7) cylindrique dans chaque pédicule (2) d'une vertèbre (1), par une découpe de pédicule périphérique (ostéotomie) (11) à travers chaque pédicule (2) à partie de l'intérieur du passage (7), par la séparation de chaque découpe (11) de pédicule par l'introduction d'un implant (16) dans le passage (7), ce qui sépare la découpe (11) de pédicule de manière à dilater le canal vertébral (3) et, par la fixation de chaque découpe (11) de pédicule, ce qui permet de guérir la vertèbre (1) dont le canal vertébral (3) est dilaté. L'implant (16) comprend une gaine (17) externe, une tige interne (18) et des collerettes extensibles (21) destinées à s'étendre radialement à l'intérieur et à stabiliser la découpe (11) de pédicule élargie destinée à dilater le canal vertébral (3).

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