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US 9,433,454 B2Granted
Variable angle screws, plates and systems
AssigneeAMEI Technologies Inc.
InventorsJohn Paolino, John Lovell, Guy F. Birkenmeier
Life of this patent
Estimating the term…
Abstract
The present disclosure relates, according to some embodiments, to orthopedic implantable device technology, and more specifically to variable angle implantable devices, systems, and methods.
Claims27
A variable angle orthopedic screw, the screw comprising:
- a threaded shank having an upper end and a tip;
- and
- a head fixed to the upper end of the shank, the head comprising:
- a generally cylindrical core of radius (rcore) and with a longitudinal axis,
- a single continuous thread encircling the core, the apex of which comprises a thread that defines an outer periphery of radius (rhead), wherein the radius (rhead) peak varies along the length of the thread;
- and
- a thread trough,
- wherein the thread has a plurality of indentations and a plurality of thread peaks, wherein the peaks and indentations are spaced apart at regular intervals along the length of the thread, each indentation having a radius (rhead-indent), wherein rcore<rhead-indent<rhead,
- wherein the thread has a minimum radius (rhead-min), wherein rcore<rhead-min, and
- wherein the variable angle screw is operable to engage a threaded hole of an orthopedic plate at a first angle aligned with the central hole axis and at least one other angle.
7 more elements
A variable angle orthopedic screw, the screw comprising:
- a threaded shank;
- and
- a head fixed to the shank, the head comprising at least one thread spanning at least one turn around the circumference of the head, the apex of which comprises a thread peak that defines a thread height that varies along the length of the thread, each head thread turn comprising:
- a first region having a maximum thread height (hmax1),
- a second region having a maximum thread height (hmax2),
- a third region having a minimum thread height (hmin3) positioned between the first region and the second region, wherein hmax1>hmin3, hmax2>hmin3, and hmin3>0 for each turn independently,
- a fourth region having a maximum thread height (hmax4), and
- a fifth region having a minimum thread height (hmin5) positioned between the second region and the fourth region, wherein hmax2>hmin5, hmax4>hmin5, and hmin5>0 for each turn independently;
- wherein the third regions of each turn are aligned in a column parallel or substantially parallel with the longitudinal axis of the screw;
- and
- wherein the fifth regions of each turn are aligned in a column parallel or substantially parallel with the longitudinal axis of the screw.
8 more elements
A variable angle orthopedic screw, the screw comprising:
- a variable angle head comprising at least one thread spanning at least a first turn and a second turn around the circumference of the head, wherein the apex of the thread comprises a thread peak that defines a thread height that varies along the length of the thread,
- wherein the first turn comprises:
- a first region having a maximum thread height (hmax1-1),
- a second region having a maximum thread height (hmax1-2), and
- a third region having a minimum thread height (hmin1-3) positioned between the first region and the second region, wherein hmax1-1>hmin1-3, hmax1-2>hmin1-3, and hmin1-3>0,
- wherein the second turn comprises:
- a first region having a maximum thread height (hmax2-1),
- a second region having a maximum thread height (hmax2-2), and
- a third region having a minimum thread height (hmin2-3) positioned between the first region and the second region, wherein hmax2-1>hmin2-3, hmax2-2>hmin2-3, and hmin2-3>0,
- wherein the third region of the first turn and the third region of the second turn are aligned in a column parallel or substantially parallel with the longitudinal axis of the head.
7 more elements
Dependencies are inferred from the claim text.