Self-tapping resorbable two-piece bone screw
First Claim
Patent Images
1. An orthopedic screw for introduction into a bone tunnel, comprising:
- a first section having a first end forming a tip of said screw, said first section extending from said first end to an intermediate point along the length of said screw, said first section including external threads along at least a portion of the length thereof, and said first section being made from a first material having a hardness such that said first section is self-threading when said first section is screwed into the bone tunnel; and
a second section coupled to said first section and extending from said intermediate point to a second end of said screw distal to said tip, said second section being formed from a bioabsorbable material which is different than said first material and said second section including external threads along at least a portion of the length thereof.
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Abstract
An orthopedic interference screw has a hard, self-threading front section and a bioabsorbable rear section. The two sections are conjoined and threaded such that the hard front section cuts threads into the bone and the softer rear section follows the threads into the bone. Preferably, the screw has an axial bore for matingly receiving a turning tool such as a hex wrench.
414 Citations
22 Claims
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1. An orthopedic screw for introduction into a bone tunnel, comprising:
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a first section having a first end forming a tip of said screw, said first section extending from said first end to an intermediate point along the length of said screw, said first section including external threads along at least a portion of the length thereof, and said first section being made from a first material having a hardness such that said first section is self-threading when said first section is screwed into the bone tunnel; and
a second section coupled to said first section and extending from said intermediate point to a second end of said screw distal to said tip, said second section being formed from a bioabsorbable material which is different than said first material and said second section including external threads along at least a portion of the length thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A two-piece interference screw, comprising:
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a front section made from biocompatible material with a strength and hardness equivalent to that of bone; and
a rear section made from a bioabsorbable polymer and coupled to said front section. - View Dependent Claims (21)
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22. A method for securing a bone plug in a bone hole using a two-piece interference screw, comprises the steps of:
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providing a front screw section composed of biocompatible material having strength and hardness at least equivalent to that of bone;
providing a rear screw section composed of bioabsorbable polymer;
coupling the front screw section to the rear screw section thereby forming the interference screw;
placing a tip of the interference screw into the bone hole;
turning the interference screw while simultaneously urging the interference screw into the bone hole;
cutting threads into the bone hole with the front screw section; and
permitting the rear screw section to thread into the threads cut by the front screw section.
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Specification