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Adjustable magnetic devices and methods of using same

  • US 10,016,220 B2
  • Filed: 10/31/2012
  • Issued: 07/10/2018
  • Est. Priority Date: 11/01/2011
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a first pedicle screw having a shank and a head;

    a second pedicle screw having a housing and a shank with a spherical head, the spherical head disposed within the housing;

    a rod coupled to the head of the first pedicle screw and extending from the first pedicle screw to the second pedicle screw;

    wherein the rod is configured to be received within the housing of the second pedicle and directly contact the spherical head of the shank;

    anda magnetic actuator, including;

    a threaded magnetic element disposed within an inner threaded surface of the housing of the second pedicle screw;

    the threaded magnetic element rotationally coupled to a bushing configured to frictionally engage a surface of the rod; and

    an external adjustment device configured to generate a rotating magnetic field;

    wherein the threaded magnetic element is configured to rotate in response to the rotating magnetic field generated by the external adjustment device, and wherein rotation of the threaded magnetic element in a first direction frictionally engages the rod between the spherical head and the bushing to substantially fix the rod with respect to the housing, and wherein rotation of the threaded magnetic element in a second direction disengages the rod from the spherical head and the bushing.

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