Systems and methods for manipulating and/or installing a pedicle screw
View Patent ↗A spinal screw assembly adapted to be secured to a vertebrae for providing securement across at least two vertebrae. The assembly includes a pedicle screw having a substantially spherical head portion, a threaded shaft portion, and an engagement surface in the head portion for driving said screw into the vertebrae, and a body member comprising a tower portion having an open top, a break-away section for manipulation of the screw upon implantation into the vertebrae, a base body at a proximal region of the body member and a break zone which acts as a transition between the base body and the tower portion. A resealably securable setscrew within the body member secures and fully contains the rod within said assembly. The break-away section remains completely outside a wound and is removed or broken off once the screw has been fully assembled inside the vertebrae.
1. A system for compression and distraction of vertebrae, comprising:
a first screw assembly including a first pedicle screw configured to attach to a first vertebra and a first body member;
a second screw assembly including a second pedicle screw configured to attach to a second vertebra and a second body member; and
a fixation rod disposed within the first body member and the second body member that includes a first engagement portion on a first end and a second engagement portion on a second end; and
a compressor including a body shaft and a lever entirely disposed on an outer surface of the body shaft, the body shaft extending along an axis and having a pair of shoulders, the lever having a first elongated portion and a second elongated portion angled with respect to the first elongated portion so as to form an elbow, wherein the elbow is disposed between the pair of shoulders, the lever rotatably attached to the body shaft, the body shaft configured to couple with the first screw assembly and the lever configured to engage the fixation rod at a location between the body shaft and the first engagement portion.
2. The system of claim 1 , wherein the lever is configured to apply a load on the first engagement portion to pull the fixation rod through the first screw assembly while the second engagement portion engages the second screw assembly to decrease a distance between the first vertebra and the second vertebra.
3. The system of claim 1 , wherein the lever includes a portion having a first length disposed at an angle relative to a second length of the body shaft to provide leverage.
4. The system of claim 1 , wherein at least one of the first and second body members includes a tower portion with parallel slots extending to a proximal open top.
5. The system of claim 4 , further comprising a break zone configured to separate the tower portion from a base portion of the at least one of the first and second body members.
6. The system of claim 5 , wherein each of the tower portion, the base portion, and the break zone includes threads to allow a setscrew to traverse a length of the tower portion, past the break zone, and into the base portion.
7. The system of claim 1 , wherein at least one of the first and second engagement portions includes one of a depression, an opening, a nib, a protrusion, a clip, a snap ring, a washer, and a flared end.
8. The system of claim 7 , wherein the flared end comprises at least a portion of the perimeter of the fixation rod.
9. The system of claim 7 , wherein at least one of the nib, the protrusion, and the flared end is integrally formed with the rod.
10. The system of claim 7 , wherein at least one of the clip, the snap ring, and the washer is be received by a groove machined into the fixation rod.