Surgical guide system for stabilization of the spine
First Claim
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1. A system for determining screw length and screw trajectory of a screw for insertion into a vertebral body, comprising:
- an anatomic guide instrument adapted to be placed against the vertebral body where the screw is to be inserted, the guide instrument having a shaft with a three-prong assembly formed at a distal end thereof, the assembly comprising a first prong, second prong, and third prong, the third prong including a holding block;
a cannulated obturator insertable through the holding block, the obturator having a window and markings indicative of optimal screw length; and
a cannula for placement over the cannulated obturator;
wherein the obturator and cannula together are effective to indicate screw length.
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Abstract
A system of instruments and a method for using these instruments for effective spinal stabilization using cannulated bone screws is described. In particular, the system and method provides accurate and efficient measurement of the appropriate screw length to be inserted in a patient with a lower spine injury. The system and method further enables accurate orientation or placement of the cannulated bone screws from outside the patient'"'"'s body. The present method describes a surgical technique for the placement of cannulated bone screw for translaminar facet, transfacet, and general orthopedic applications.
285 Citations
26 Claims
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1. A system for determining screw length and screw trajectory of a screw for insertion into a vertebral body, comprising:
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an anatomic guide instrument adapted to be placed against the vertebral body where the screw is to be inserted, the guide instrument having a shaft with a three-prong assembly formed at a distal end thereof, the assembly comprising a first prong, second prong, and third prong, the third prong including a holding block;
a cannulated obturator insertable through the holding block, the obturator having a window and markings indicative of optimal screw length; and
a cannula for placement over the cannulated obturator;
wherein the obturator and cannula together are effective to indicate screw length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An anatomic guide instrument for determining screw length and screw trajectory of a screw for insertion into a vertebral body, comprising:
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a handle connected to a shaft with a three-prong assembly formed at a distal end thereof, the assembly comprising a first prong, second prong, and third prong including a holding block, the shaft being angularly adjustable with respect to the three-prong assembly;
wherein the first and second prongs are adapted to be placed against the vertebral body where the screw is to be inserted, while the third prong is adapted to define the trajectory of the screw. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A method for determining screw length and screw trajectory of a screw for insertion into a vertebral body, comprising:
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providing an anatomic guide instrument adapted to be placed against the vertebral body where the screw is to be inserted, the guide instrument having a handle with a three-prong assembly formed at a distal end thereof, the assembly comprising a first prong, second prong, and third prong, the third prong including a holding block;
placing the anatomic guide instrument through the first incision and against the vertebral body such that the first prong and second prong contact an aspect of the vertebral body;
inserting a cannulated obturator through the holding block, the obturator having a window and markings indicative of optimal screw length;
placing a cannula having a proximal end and a distal end over the cannulated obturator; and
determining the optimal screw length by reading where the distal end of the cannula aligns with the markings of the cannulated obturator. - View Dependent Claims (23, 24, 25, 26)
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Specification