Longitudinal connecting member with sleeved tensioned cords

Details Longitudinal connecting member with sleeved tensioned cords Longitudinal connecting member with sleeved tensioned cords

A - Human Necessities

61

B

A61B 17/70 (2006.01)

Patent

CA 2739997

A dynamic fixation medical implant having at least two bone anchors includes a longitudinal connecting member assembly having rigid sleeves for attachment to the bone anchors, at least one spacer engaging the bone anchors and the sleeves, and in some embodiments, an end elastic bumper. A flexible cord is initially slidingly received within the rigid sleeves, the spacer and the bumper. The spacer may include an optional inelastic inner liner, with at least one of the sleeves having an extension slid-ingly receivable within the liner. Some sleeves include apertures for receiving a closure top portion for locking the cord against the sleeve, or alternatively receiving a closure top that does not extend into the aperture, the slip or grip option provided by the aperture in each sleeve resulting in an overall connector with variable segmental stiffness.

L'invention porte sur un implant médical à fixation dynamique comportant au moins deux ancrages osseux, lequel implant comprend un ensemble élément longitudinal de liaison comprenant des gaines rigides pour une fixation aux ancrages osseux, au moins une entretoise en prise avec les ancrages osseux et les gaines et, dans certains modes de réalisation, une butée élastique d'extrémité. Un cordon souple est initialement reçu de manière coulissante à l'intérieur des gaines rigides, de l'entretoise et de la butée. L'entretoise peut comprendre facultativement un revêtement intérieur inélastique, au moins l'une des gaines comportant une extension pouvant être reçue de façon coulissante à l'intérieur du revêtement. Certaines gaines comprennent des ouvertures destinées à recevoir un élément d'extrémité supérieure de fermeture destiné à verrouiller le cordon vis-à-vis de la gaine, ou en variante recevoir une partie supérieure de fermeture ne s'étendant pas dans l'ouverture, l'option de coulissement ou de préhension fournie par l'ouverture dans chaque gaine conduisant à un connecteur global à rigidité segmentaire variable.

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