Bone screw
First Claim
Patent Images
1. A bone screw, comprising:
- a head for receiving a screw driving device; and
a shaft having a length and extending from said head, said shaft including a first series of helical threads having a first diameter and a first pitch, and a second series of helical threads interleaved with said first series of helical threads and having a second diameter and a second pitch;
wherein said second diameter is substantially different than said first diameter and at least one of said first and second pitches changes along the length of said shaft.
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Abstract
A bone screw having a head with a socket for receiving a screw driving device and a shaft extending from the head. The shaft includes respective alternating first and second helical threads running substantially parallel with each other along the shaft. Additionally, the second series of helical threads exhibits a diameter substantially different than the first series of helical threads. In accordance with this aspect of the invention, the thread pattern of the bone screw exhibits a hi-low thread configuration. In addition, the bone screw may comprise a plurality of series of helical threads, each exhibiting different diameters from the others.
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Citations
17 Claims
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1. A bone screw, comprising:
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a head for receiving a screw driving device; and a shaft having a length and extending from said head, said shaft including a first series of helical threads having a first diameter and a first pitch, and a second series of helical threads interleaved with said first series of helical threads and having a second diameter and a second pitch; wherein said second diameter is substantially different than said first diameter and at least one of said first and second pitches changes along the length of said shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A bone screw, comprising:
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a head for receiving a screw driving device; and a shaft having a length and extending from said head, said shaft including at least two series of interleaved helical threads, each of said series of helical threads having a pitch and having a substantially different diameter than each other of said series of helical threads; wherein at least one of said series of helical threads changes pitch along the length of said shaft.
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17. A bone screw, comprising:
A shaft having a first end, a second end, and a length therebetween, said first end of said shaft being configured to accept a driving device and said second end of said shaft including a first series of helical threads having a first diameter and a first pitch, and at least one second series of helical threads having a second diameter and a second pitch, wherein said second diameter is substantially different than said first diameter and at least one of said first and second pitches changes along the length of said shaft, and wherein said at least one second series of helical threads extend at least part of the way from said first end of said shaft to said second end of said shaft.
Specification