Fixation system with multidirectional stabilization pegs
First Claim
Patent Images
1. A fracture fixation system, comprising:
- a) a substantially rigid plate having a plurality of peg holes adapted to individually receive fixation pegs therein, said peg holes having an upper portion and a lower portion, said upper portion having a first internal thread, and said lower portion having a radius of curvature;
b) a plurality of pegs each having a head and a shaft, said shaft sized to be received through said peg holes, and said head having a lower surface with substantially a same radius of curvature as said lower portion of said peg holes; and
c) a plurality of set screws each having a body including a second thread rotationally engageable with said first thread, and a proximal rotational engagement means for permitting a rotational force to be applied to said set screw, wherein when said pegs are provided into respective peg holes, each said peg may be positioned at a plurality of angles relative to an axis normal to a lower surface of a portion of said plate surrounding a respective peg hole, and once so positioned, respective set screws when threaded into said upper portions of said peg holes fix said pegs at their respective angles.
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Abstract
A fixation system includes a plate intended to be positioned against a bone, a plurality of bone screws for securing the plate along an non-fractured portion of the bone, and a plurality of bone pegs which extend from the plate and into bone fragments of the fracture to provide a supporting framework. The pegs can be oriented at various angles relative to an axis normal to the lower surface of the plate. For each peg, once the peg has been appropriately positioned within the peg hole, a set screw is threaded into the peg hole and tightened, thereby securing the peg in the selected orientation.
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Citations
37 Claims
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1. A fracture fixation system, comprising:
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a) a substantially rigid plate having a plurality of peg holes adapted to individually receive fixation pegs therein, said peg holes having an upper portion and a lower portion, said upper portion having a first internal thread, and said lower portion having a radius of curvature;
b) a plurality of pegs each having a head and a shaft, said shaft sized to be received through said peg holes, and said head having a lower surface with substantially a same radius of curvature as said lower portion of said peg holes; and
c) a plurality of set screws each having a body including a second thread rotationally engageable with said first thread, and a proximal rotational engagement means for permitting a rotational force to be applied to said set screw, wherein when said pegs are provided into respective peg holes, each said peg may be positioned at a plurality of angles relative to an axis normal to a lower surface of a portion of said plate surrounding a respective peg hole, and once so positioned, respective set screws when threaded into said upper portions of said peg holes fix said pegs at their respective angles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11-17. -17. (canceled)
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18. A fracture fixation system, comprising:
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a) a substantially rigid plate defining a plurality of peg holes adapted to individually receive fixation pegs therein, said peg holes having a portion provided with a first internal thread;
b) a plurality of pegs each having a head portion and a shaft portion, said shaft portion sized to be received through said peg holes, and said head portion defining a ball portion with a first substantially spherical radius of curvature; and
c) a plurality of set screws each having a body including a second thread rotationally engageable with said first thread, a proximal rotational engagement means for permitting a rotational force to be applied to said set screw, and a socket having said first substantially spherical radius of curvature such that each said set screw and its respective peg are adapted to articulate relative to each other by movement of said ball portion within said socket, and for each said set screw said socket portion of said set screw captures said ball portion of one of said pegs, wherein when said pegs are provided into respective peg holes, each said peg may be positioned at a plurality of angles relative to an axis normal to a lower surface of said plate, and once so positioned, respective set screws when threaded into said upper portions of said peg holes fix said pegs at their respective angles. - View Dependent Claims (20, 28)
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19. (canceled)
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21-27. -27. (canceled)
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29-35. -35. (canceled)
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36. A fracture fixation system, comprising:
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a) a substantially rigid plate defining a plurality of peg holes adapted to individually receive fixation pegs therein, said peg holes having a portion provided with a first internal thread;
b) a plurality of pegs each having a head portion and a shaft portion, said shaft portion sized to be received through said peg holes, and said head portion defining a ball portion with a first substantially spherical radius of curvature and having a plurality of nubs spaced about said ball portion; and
c) a plurality of set screws each having a body including a second thread rotationally engageable with said first thread, a proximal rotational engagement means for permitting a rotational force to be applied to said set screw, and a socket having said first substantially spherical radius of curvature such that each said set screw and its respective peg are adapted to articulate relative to each other by movement of said ball portion within said socket, and for each said set screw said socket portion of said set screw captures said ball portion of one of said pegs, said socket portion of each said set screw defines a plurality of slots, wherein when said ball portion is positioned in said socket portion and said ball portion is articulated within said socket, said nubs are moved within said slots wherein when said pegs are provided into respective peg holes, each said peg may be positioned at a plurality of angles relative to an axis normal to a lower surface of said plate, and once so positioned, respective set screws when threaded into said upper portions of said peg holes fix said pegs at their respective angles. - View Dependent Claims (37)
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Specification