Variable angle screw for spinal implant system

Details Variable angle screw for spinal implant system Variable angle screw for spinal implant system

A - Human Necessities

61

B

A61B 17/70 (2006.01) A61B 17/84 (2006.01) A61B 17/86 (2006.01)

Patent

CA 2129749

A variable angle bone screw system (10) for use in a spinal implant system to connect a vertebral fixation element to a spinal rod extending adjacent the vertebral column in a patient. The system includes an eyebolt (26a) having a threaded stem (31), a washer (25) receivable over the stem (31) of the eyebolt (26a), a bone screw (20) including a yoked head (21) to permit top loading of the stem of the eyebolt, and a nut (26b) engaging the threaded stem of the eyebolt and cooperating with the eyebolt to clamp the bone screw and washer therebetween. The bone screw head and the washer include interdigitating locking means (24, 27) for restraining the pivoting of the screw about the axis of the eyebolt threaded stem but permitting interlocking in variable angular orientations.

Dispositif de vis osseuse à angularité variable (10) s'utilisant dans un système d'implant rachidien, afin de relier un élément de fixation vertébrale à une tige rachidienne s'étendant de façon contiguë à la colonne vertébrale d'un patient. Le dispositif comprnd un oeillet (26a) possédant une tige filetée (31), une rondelle (25) logeant au-dessus de ladite tige (31) de l'oeillet (26a), une vis osseuse (20) comprenant une tête à rebord (21) permettant le chargement par le haut de la tige de l'oeillet, ainsi qu'un écrou (26b) s'accouplant à la tige filetée de l'oeillet et coopérant avec celui-ci, de façon à insérer la vis osseuse et la rondelle. La tête de la vis et la rondelle comprennent des moyens de verrouillage à action réciproque (24, 27) servant à limiter le pivotement de la vis autour de l'axe de la tige filetée de l'oeillet mais autorisant un verrouillage réciproque selon des orientations angulaires variables.

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