A bone screw is disclosed. A head includes a driver-receiving element formed thereon. A shank having a proximal portion, which is integrally connected to the head, and a distal portion maintains a constant diameter from the proximal portion to the distal portion. Three helical threads extend around
A bone screw is disclosed. A head includes a driver-receiving element formed thereon. A shank having a proximal portion, which is integrally connected to the head, and a distal portion maintains a constant diameter from the proximal portion to the distal portion. Three helical threads extend around the shank from the proximal portion to the distal portion. The three helical threads are symmetrically and helically aligned and advance uniformly along the length of the shank for each revolution to define a thread depth that remains constant along the length of the shank. The three helical threads respectively include three leads, which are offset by approximately 120° from each another. A tip is integrally connected to the distal portion of the shank and the tip intersects with a flute to define a self-tapping point.
대표청구항▼
1. A bone screw comprising: a substantially spherical head having a hexagonal socket configured to accept a hex screwdriver;a lower hemisphere of the spherical head presenting a deformable face operable for deformation;a shank having a proximal portion and a distal portion with a constant diameter f
1. A bone screw comprising: a substantially spherical head having a hexagonal socket configured to accept a hex screwdriver;a lower hemisphere of the spherical head presenting a deformable face operable for deformation;a shank having a proximal portion and a distal portion with a constant diameter from the proximal portion to the distal portion, the proximal portion being integrally connected to the head; andthe shank consists of: first, second, and third helical threads extending around the shank from the proximal portion to the distal portion, the first, second, and third helical threads being symmetrically and helically aligned, the first, second, and third helical threads advancing uniformly along the length of the shank for each revolution to define a thread depth that remains constant along the length of the shank,the first, second, and third helical threads respectively including a first lead, a second lead, and a third lead, the first, second, and third helical leads being offset by approximately 120° from one another,the first, second, and third helical threads including a pitch angle of approximately 36°,the first, second, and third helical threads including an angle with the shank of approximately 96°,a tip integrally connected to the distal portion of the shank, the tip intersected with a flute to define a self-tapping point, andthe first, second, and third helical threads each comprise proximal and distal flanks that converge toward one another from a root to a crest thereof from the proximal portion to the tip at the distal portion. 2. The bone screw as recited in claim 1, wherein the first, second, and third helical threads comprise a pitch of 0.1 inches. 3. The bone screw as recited in claim 1, wherein the proximal and distal flanks converge toward one another at substantially the same rate. 4. A bone screw comprising: a substantially spherical head having a driver-receiving element formed thereon, the spherical head configured to be held in a tulip, the tulip including opposing first and second U- shaped receiving slots aligned along a transverse axis, the opposing first and second U-shaped receiving slots operable for receiving a rod;an upper hemisphere of the spherical head configured to accept a coupling collar in a snap fit engagement;a lower hemisphere of the spherical head presenting a deformable face operable for deformation with a rod;a shank having a proximal portion and a distal portion with a constant diameter from the proximal portion to the distal portion, the proximal portion being integrally connected to the head; andthe shank consists of: first, second, and third helical threads extending around the shank from the proximal portion to the distal portion, the first, second, and third helical threads being symmetrically and helically aligned, the first, second, and third helical threads advancing uniformly along the length of the shank for each revolution to define a thread depth that remains constant along the length of the shank,the first, second, and third helical threads respectively including a first lead, a second lead, and a third lead, the first, second, and third helical leads being offset by approximately 120° from one another,a tip integrally connected to the distal portion of the shank, the tip intersected with a flute to define a self-tapping point,the first, second, and third helical threads each comprise proximal and distal flanks that converge toward one another from a root to a crest thereof, from the proximal portion to the tip at the distal portion, andthe proximal and distal flanks converge toward one another at substantially the same rate. 5. The bone screw as recited in claim 4, wherein the first, second, and third helical threads comprise a pitch angle of approximately 36°. 6. The bone screw as recited in claim 4, wherein the first, second, and third helical threads comprise a pitch of 0.1 inches.
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이 특허에 인용된 특허 (7)
Serhan, Hassan A., Locking cap assembly for spinal fixation instrumentation.
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