Hybrid bone fixation element and methods of using the same
First Claim
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1. A hybrid bone fixation element for engaging a patient'"'"'s bone including a cortical outer portion surrounding an inner cancellous portion;
- the hybrid bone fixation element comprising;
a threaded proximal cortical bone contacting portion for threadably engaging the cortical outer portion of a patient'"'"'s bone, the threaded proximal cortical bone contacting portion having a cannulated bore formed therein; and
a non-threaded expandable distal cancellous bone contacting portion for engaging the inner cancellous portion, the non-threaded expandable distal cancellous bone contacting portion including a plurality of closed periphery holes;
wherein the threaded proximal cortical bone contacting portion comprises an externally threaded shaft having a radial diameter, the threaded shaft coupled to the non-threaded expandable distal cancellous bone contacting portion along a longitudinal axis, the non-threaded expandable distal cancellous bone contacting portion has a first unexpanded radial diameter in a first unexpanded state substantially equal to or less than the radial diameter of the externally threaded shaft, and the non-threaded expandable distal cancellous bone contacting portion has a second expanded radial diameter in a second expanded state at least twice the radial diameter of the externally threaded shaft; and
an elongated head portion integral with the externally threaded shaft along the longitudinal axis, the head portion comprising a drive surface.
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Abstract
The present invention is directed to a hybrid bone fixation element including a threaded proximal cortical bone contacting portion for threadably engaging the cortical portion of a human bone and a non-threaded expandable distal cancellous portion for engaging the cancellous portion of the human bone. The hybrid bone fixation element can be used, for example, as a pedicle screw, a bone screw or in any other type of bone fixation application.
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Citations
16 Claims
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1. A hybrid bone fixation element for engaging a patient'"'"'s bone including a cortical outer portion surrounding an inner cancellous portion;
- the hybrid bone fixation element comprising;
a threaded proximal cortical bone contacting portion for threadably engaging the cortical outer portion of a patient'"'"'s bone, the threaded proximal cortical bone contacting portion having a cannulated bore formed therein; and a non-threaded expandable distal cancellous bone contacting portion for engaging the inner cancellous portion, the non-threaded expandable distal cancellous bone contacting portion including a plurality of closed periphery holes; wherein the threaded proximal cortical bone contacting portion comprises an externally threaded shaft having a radial diameter, the threaded shaft coupled to the non-threaded expandable distal cancellous bone contacting portion along a longitudinal axis, the non-threaded expandable distal cancellous bone contacting portion has a first unexpanded radial diameter in a first unexpanded state substantially equal to or less than the radial diameter of the externally threaded shaft, and the non-threaded expandable distal cancellous bone contacting portion has a second expanded radial diameter in a second expanded state at least twice the radial diameter of the externally threaded shaft; and an elongated head portion integral with the externally threaded shaft along the longitudinal axis, the head portion comprising a drive surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- the hybrid bone fixation element comprising;
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10. A hybrid bone fixation element for engaging a bone having a longitudinal axis comprising:
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an enlarged head having a drive surface; at least one externally threaded shaft portion having a diameter, a proximal end and a distal end; and an expandable stent coupled to the externally threaded shaft portion, the expandable stent having a first unexpanded diameter substantially equal to or less than the diameter of the externally threaded shaft, and a second expanded diameter at least twice the diameter of the externally threaded shaft; wherein the expandable stent includes a plurality of closed periphery holes; and wherein the expandable stent is coupled to the distal end of the externally threaded shaft portion and the enlarged head is coupled to the proximal end of the externally threaded shaft portion, wherein the externally threaded shaft comprises a cannulated bore formed therein. - View Dependent Claims (11, 12, 13, 14)
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15. A hybrid bone fixation device for engaging bone having a longitudinal axis comprising:
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an enlarged head having a proximal end, a distal end and a drive surface, the enlarged head having a bore formed therethrough from the proximal end to the distal end; a shaft having a proximal end, a distal end and a continuous outer surface between the proximal and distal ends defining a cross-section, the outer surface having an external thread, the proximal end of the shaft coupled integrally as a monolith with the distal end of the enlarged head along the longitudinal axis, the shaft having a cannulation formed thereon in communication with the bore of the head and extending from the proximal end to the distal end of the shaft; and an expandable stent having a proximal end, a distal end and a first cross-section in the unexpanded state that is substantially equal to the cross-section of the shaft and an expanded state having a second cross-section that is different than the first cross-section, the proximal end of the expandable stent coupled to the distal end of the shaft along the longitudinal axis; wherein the expandable stent includes a plurality of closed periphery holes. - View Dependent Claims (16)
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Specification