SPINAL FACET COMPRESSION SCREW WITH VARIABLE PITCH THREAD ZONES AND BUTTRESS HEAD
First Claim
Patent Images
1. A surgical implant comprising:
- a screw element having a screw head, a first thread having a first thread pitch, a second thread having a second thread pitch and an intermediate portion coupling said first and second thread pitches, said first and second thread pitches being different; and
said screw head defining a tool attachment zone;
a buttressing head associated with said first thread and being dimensioned to be larger than a diameter of said first threads to provide external buttressing as said first and second threads compress a first bone and a second bone together.
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Abstract
A surgical implant comprising a screw element having a screw head, a first thread having a first thread pitch, a second thread having a second thread pitch and an intermediate portion coupling the first and second thread pitches with the first and second thread pitches being different. The implant has a buttressing head associated with the first thread, and it is dimensioned to be larger than a diameter of the first threads to provide external buttressing as the first and second threads compress a first bone and a second bone together.
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Citations
29 Claims
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1. A surgical implant comprising:
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a screw element having a screw head, a first thread having a first thread pitch, a second thread having a second thread pitch and an intermediate portion coupling said first and second thread pitches, said first and second thread pitches being different; and said screw head defining a tool attachment zone; a buttressing head associated with said first thread and being dimensioned to be larger than a diameter of said first threads to provide external buttressing as said first and second threads compress a first bone and a second bone together. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A surgical implant comprising:
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an elongated body having a first end and a second end; a screw head associated with said first end; a first thread having a first thread pitch associated with said first end, a second thread having a second thread pitch and an intermediate portion coupling said first and second thread pitches, said first and second thread pitches being different; and said screw head defining a tool attachment zone; a buttressing head situated between said first thread and said screw head;
said buttressing head being dimensioned to be larger than a diameter of said first threads to provide external buttressing to a first bone as said first and second threads compress a second bone against said first bone. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification