Abstract: A transverse connector is provided that is useful for adding rigidity to a spinal fixation system employing a pair of generally parallel spine rods. The transverse connector includes a body portion with a longitudinal aperture for receiving a shaft of an adjusting arm such that the adjusting arm can slide into and out of the longitudinal aperture. The body and adjusting arm, while being in sliding engagement for adjustment of the length of the transverse connector, are secured to one another by a set screw threaded into a threaded aperture provided on the body portion. The threaded aperture is generally perpendicular to the longitudinal aperture so that the tip of the set screw will form an interference fit against the shaft of the adjusting arm. Each of the body and adjusting arm includes a clamping assembly consisting of a pair of clamp halves which cooperate to grip one of the spine rods. Each pair of clamp halves fastens to a different one of the spine rods.
Abstract: The present invention relates to a low-profile screw-clamp assembly for use in spinal support fixation systems. The low-profile spinal fixation system comprises an anchor screw, a clamping assembly mounted on the anchor screw and a sleeve nut for attaching the clamping assembly to the anchor screw. The sleeve nut is substantially recessed into the clamping assembly, when the anchor screw and clamps are assembled. The present invention also relates to a locking mechanism, and method for making such a locking mechanism for locking the sleeve nut in place once assembled which comprises a crimp placed in a wall which forms the recess in the clamping assembly.
Abstract: A bone fusion mass constrainer is useful for promoting fusion between a pair of adjacent vertebrae. The bone fusion mass constrainer includes a generally cylindrical cage assembly having an internal cavity with open top and bottom surfaces. The cage portion is intended to be positioned in contact with the cancellous bone of the adjacent vertebrae. A pair of horizontal platforms extend out from the cage assembly and provide support for the vertebrae by contacting the harder cortical bone of the endplates of the vertebrae. Bone graft is inserted into the cavity where it contacts the cancellous bone of the adjacent vertebrae and promotes fusion between the two vertebrae. An end cap is provided over the proximal opening of the cage assembly to prevent migration of bone graft out from the cage.
Abstract: A cervical spine fixation system is described. The fixation system comprises a bone screw for implanting in the cervical vertebrae of the spine and for accommodating a clamping assembly. The clamping assembly comprises a rod receiving aperture which is angularly oriented a predetermined amount from perpendicular with respect to a longitudinal axis of the bone screw.
Abstract: The present invention relates to a spinal fixation system. The system comprises a screw for pivotally attaching a bolt to a vertebrae to be treated. A pivot block is threaded onto the bolt to move the pivot block up and down the bolt. A rod is secured at each of its ends to vertebrae on either side of the vertebrae to be treated and a clamp block is attached to the rod and the pivot block to thereby allow the pivot block to push, pull or rotate the vertebrae to be treated.
Abstract: A connector for cross bracing a first spine rod and a second spine rod. The connector comprises a cross brace, upper saddles and connectors for connecting the upper saddles and cross brace to the first and second spine rods to thereby cross brace the first and second spine rods. Lower saddles are integrally formed at opposite ends of the cross brace to mate with the upper saddles in gripping the spine rods.
Abstract: The present invention relates to a low-profile screw-clamp assembly for use in spinal support fixation systems. The low-profile spinal fixation system has an anchor screw, a clamping assembly mounted on the anchor screw and a sleeve nut for attaching the clamping assembly to the anchor screw. The sleeve nut is substantially recessed into the clamping assembly, when the anchor screw and clamps are assembled. The present invention also relates to a locking mechanism, and method for making such a locking mechanism for locking the sleeve nut in place once assembled where a crimp is placed in a wall which forms the recess in the clamping assembly.
Abstract: A spinal fixation device and method for the stabilization of the spine after surgical procedures such as those related to degenerative disc diseases are described. The device comprises a spacer, which is placed between adjacent vertebrae when installed and a locking mechanism attached to the spacer. The locking mechanism attaches the device to the spinous processes of adjacent vertebrae of the spine in a manner which is non-invasive with respect to the vertebrae to which it is attached.
August 18, 1993
Date of Patent:
March 5, 1996
Advanced Spine Fixation Systems, Inc.
Robert S. Howland, Richard M. Salib, Kenneth Pettine
Abstract: A spinal fixation device for immobilizing a portion of a spine includes at least one spine rod and a plurality of bone screws that are threaded into an appropriate number of vertebrae and each of which includes a threaded end protruding from the vertebra. Clamps are used to fasten a spine rod to the bone screws. Each clamp includes a body portion with a first aperture for receiving the protruding threaded end of a bone screw. The clamp is fastened to the threaded end of the bone screw with a nut. A second aperture receives the spine rod and includes a plurality of longitudinal teeth that cooperate with a serrated spine rod to provide a secure grip between the two and to prevent rotation of the spine rod with respect to the clamp. A threaded aperture communicates with the second aperture and receives a set screw for locking the rod within the second aperture.
Abstract: A spinal fixation system. The spinal fixation system has a set of screw clamp assemblies adapted for attachment of a rod. The spinal fixation system comprises anchor screws and clamps. The anchor screws include a shoulder width "y" that varies within the anchor screws in the set to seat a clamp at a desired distance above the plane of the spine into which the anchor screws are implanted. The clamps include an arm length "x" that varies within the clamps in the set to attach the rod at a desired distance from the clamp seat site and apertures for receiving the rod within the clamps, wherein the apertures are set at an angle "a" from a plane perpendicular to the long axis of the anchor screw when a clamp is seated on the anchor screw that varies within the clamps in the set.
Abstract: A branch connector is useful for connecting a pair of spine rods in a spinal fixation system. The branch connector includes an upper saddle, a lower saddle and a bolt for clamping the saddles together. The upper and lower saddles mate to define a pair of openings for receiving the spine rods. The bolt includes a threaded shaft that extends through a first aperture defined by the upper saddle and threads into a second aperture defined by the lower saddle. By tightening the bolt, the saddles are drawn together to securely grip the spine rods. The openings can be arranged in different configurations to perform different functions. A branch connector with parallel openings forms a branch clamp for connecting two spine rods in series. A pair of branch connectors arranged as transverse clamps with perpendicular openings can be combined with a transverse rod to form a cross brace assembly for bridging a pair of generally parallel spine rods.