Lumbar spine fixation apparatus and method
First Claim
1. A spinal fixation apparatus comprising:
- a rod;
a plurality of pedicle screws, each pedicle screw comprising an anchor head with a top at one end and a screw shaft extending from the other end of said anchor head, said screw shaft having a predetermined length sufficient to pass through a pedicle of a vertebra and into threaded engagement with a vertebral body of the vertebra, said anchor head comprising a bolt head external profile and a throughbore passing transversely through an axis of said anchor head, said anchor head having a coaxial, blind bore in said top, said pedicle screw including an anchor body configured to be telescopically received in said blind bore, said anchor body having a transverse hole therethrough, said hole being configured to be placed in registry with said throughbore to allow said rod to be passed through said anchor head, said anchor body including a threaded boss and a nut threadedly engaged to said threaded boss and operable to force said anchor body upwardly relative to said anchor head thereby clamping said rod to said anchor head; and
a first pedicle screw configured to be embedded in a first vertebra and a second pedicle screw configured to be embedded in a second vertebra with said rod clamped by said first pedicle screw and said second pedicle screw, said rod being configured to rigidly orient the first vertebra to the second vertebra.
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Accused Products
Abstract
A spinal fixation apparatus and method wherein various elements are mounted to the vertebra and the sacrum of a spine and are selectively interconnected to achieve a predetermined fixation and/or correction of a particular spinal condition. The apparatus includes pedicle screws, bone screws, sacral rods, sublaminar hooks, spinous process hooks, longitudinal rods, lateral rods, universal interlinks, rod clamps, and pedicle screw anchors, all of which can be readily interconnected into a predetermined construct as a spinal fixation apparatus. A burr guide apparatus is provided to prepare the access site for a pedicle screw and a sacral screw guide is used to accurately align the pilot holes for the sacral screws.
1192 Citations
27 Claims
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1. A spinal fixation apparatus comprising:
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a rod; a plurality of pedicle screws, each pedicle screw comprising an anchor head with a top at one end and a screw shaft extending from the other end of said anchor head, said screw shaft having a predetermined length sufficient to pass through a pedicle of a vertebra and into threaded engagement with a vertebral body of the vertebra, said anchor head comprising a bolt head external profile and a throughbore passing transversely through an axis of said anchor head, said anchor head having a coaxial, blind bore in said top, said pedicle screw including an anchor body configured to be telescopically received in said blind bore, said anchor body having a transverse hole therethrough, said hole being configured to be placed in registry with said throughbore to allow said rod to be passed through said anchor head, said anchor body including a threaded boss and a nut threadedly engaged to said threaded boss and operable to force said anchor body upwardly relative to said anchor head thereby clamping said rod to said anchor head; and a first pedicle screw configured to be embedded in a first vertebra and a second pedicle screw configured to be embedded in a second vertebra with said rod clamped by said first pedicle screw and said second pedicle screw, said rod being configured to rigidly orient the first vertebra to the second vertebra. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A spinal fixation apparatus kit comprising:
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a pedicle screw comprising an anchor head and a distal screw extending from said anchor head, said distal screw having a predetermined length, said predetermined length being sufficient to pass through the pedicle of a vertebra into the vertebral body of the vertebra, said anchor head comprising a blind bore coaxial with said screw and a transverse, rod-receiving hole passing through said anchor head and said blind bore on a diameter of said blind bore, an anchor body telescopically received in said blind bore, said anchor body comprising a transverse throughbore in adjustable alignment with said hole in said anchor head, said anchor body including a threaded bolt coaxial with said screw and a nut threadedly mounted to said threaded bolt, said nut being operable to be tightened against said anchor head thereby pulling said throughbore of said anchor body out of alignment with said hole in said anchor head thereby securely clamping a rod to said anchor head, said pedicle screw further comprising a tapered shoulder between said anchor head and said screw, said tapered shoulder outwardly compressing bone of the vertebra thereby reducing micromotion between said anchor head portion of said pedicle screw and the vertebra, said anchor head comprising an external profile of a bolt head; a universal interlink comprising a pair of clamps, each of said clamps comprising a body with upper and lower faces oriented in parallel and a throughbore through said faces, a side extension having an outwardly opening, transverse slot, said transverse slot terminating inwardly in a transverse throughbore through said side extension, said transverse throughbore telescopically receiving a rod in a slid fit relationship, said clamp being mountable in a face-to-face relationship with a bolt passing through said throughbore, tightening said bolt causing said transverse slots to become more narrow thereby constricting said transverse throughbores while simultaneously interlocking said pair of clamps; a sacral rod comprising a mounting body having an axis and a fixation rod extending coaxially from one end of said mounting body, said mounting body comprising at least one mounting hole comprising a countersink and a threaded hole in the bottom of said countersink, said mounting hole having an axis that is angularly offset from said mounting body axis; a sacral screw for securing said sacral rod to a sacrum comprising a screw and a bolt head with a threaded shoulder between said screw and said bolt head, said threaded shoulder threadedly engaging said threaded hole in said mounting body with said bolt head being received in said countersink; and a rod, said rod having the same diameter as said fixation rod, said rod being conformable and selectively engageable by said universal interlink and pedicle screw, said rod being adaptable to being selectively used as a lateral rod and a longitudinal rod for said spinal fixation apparatus. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for providing fixation to a spine comprising the steps of:
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obtaining a pedicle screw, said pedicle screw comprising a screw shaft and an anchor head mounted to said screw shaft, said anchor head including a blind bore coaxial with said screw shaft and an anchor body telescopically received in said blind bore, said anchor body including a threaded boss and a nut threadedly engageable to said threaded boss, said anchor head and said anchor body including a throughbore oriented transversely through said anchor head and said anchor body, said throughbore receiving a rod with said nut causing said anchor body to clamp said rod to said anchor head; mounting at least two of said pedicle screws selectively to vertebrae and the sacrum of the spine; affixing a rod to the spine by interconnecting said pedicle screws with said rod by passing a portion of said rod into said throughbore; and clamping said rod to said pedicle screws by tightening said nut on said threaded boss on each of said pedicle screws. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification