Adjustable magnetic devices and methods of using same
First Claim
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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Accused Products
Abstract
A system includes a first pedicle screw, a second pedicle screw, and an adjustable rod having an outer housing coupled to one of the first pedicle screw and the second pedicle screw, the outer housing having a threaded shaft secured to one end thereof extending along an interior portion thereof. The system further includes a hollow magnetic assembly disposed within the outer housing and having a magnetic element disposed therein, the hollow magnetic assembly having an internal threaded surface engaged with the threaded shaft, the magnetic assembly being coupled to the other of the first pedicle screw and the second pedicle screw, wherein the hollow magnetic assembly rotates in response to an externally applied magnetic field to thereby lengthen or shorten the distance between the first pedicle screw and the second pedicle screw.
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Citations
17 Claims
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1. A system comprising:
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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;and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification