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US 2014/0277180 A1Published application
Variable angle screws, plates and systems
AssigneeAMEI Technologies Inc.
InventorsJohn Paolino, John Lovell, Guy F. Birkenmeier
Life of this patent
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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.
Claims83
A variable angle orthopedic plate, the plate comprising:
- an upper surface;
- a bone facing surface;
- at least one variable angle through hole between the upper surface and the bone facing surface, the hole having a generally cylindrical shape with a central hole axis and comprising a single continuous thread, the apex of which defines a central hole aperture of radius (raperture), and a thread trough defining a total hole radius of (rhole),
- wherein the thread has at least one indentation along its length, each indentation having a radius (rindent), wherein raperture<rindent<rhole, and
- wherein the variable angle hole is operable to engage a threaded head of an orthopedic fastener at a first angle aligned with the central hole axis and at least one other angle.
2 more elements
A variable angle orthopedic plate, the plate comprising:
- a variable angle through hole comprising at least one thread spanning at least one turn around the circumference of the hole, each turn comprising:
- a first region having a maximum thread height (hmax1),
- a second region having a maximum thread height (hmax2), and
- 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,
- wherein the third regions of each turn are aligned in a column parallel or substantially parallel with the central hole axis.
2 more elements
A variable angle orthopedic plate, the plate comprising:
- a variable angle through hole comprising at least one thread spanning at least a first turn around the circumference of the hole, the first turn comprising:
- 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.
1 more element
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 defines an outer periphery of radius (rhead);
- and
- a thread trough,
- wherein the thread has at least one indentation along its length, each indentation having a radius (rhead-indent), wherein rcore<rhead-indent<rhead, 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.
6 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, each head thread turn comprising:
- a first region having a maximum thread height (hmax1),
- a second region having a maximum thread height (hmax2), and
- 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,
- wherein the third regions of each turn are aligned in a column parallel or substantially parallel with the longitudinal axis of the screw.
4 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 around the circumference of the head, the first turn comprising:
- 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.
1 more element
A variable angle orthopedic system, the system comprising:
- (a) an orthopedic plate selected from the group consisting of:
- (1) a fixed angle plate comprising:
- an upper surface;
- a bone facing surface;
- and
- one or more through holes between the upper surface and the bone facing surface, each hole having a generally cylindrical shape with a central hole axis and comprising a single continuous thread, the apex of which defines a central hole aperture of constant radius (rhole-aperture-constant), and a thread trough defining a constant total hole radius of (rhole-constant);
- and
- (2) a variable angle plate comprising:
- an upper surface;
- a bone facing surface;
- and
- at least one variable angle through hole between the upper surface and the bone facing surface, the hole having a generally cylindrical shape with a central hole axis and comprising a single continuous thread, the apex of which defines a central hole aperture of radius (rhole-aperture), and a thread trough defining a total hole radius of (rhole), wherein the thread has at least one indentation along its length, each indentation having a radius (rhole-indent), wherein raperture<rhole-indent<rhole;
- and
- (a) an orthopedic plate selected from the group consisting of:
- (b) at least one orthopedic screw selected from the group consisting of:
- (1) a fixed angle screw comprising:
- a threaded shank;
- and
- a head fixed to the shank, the head comprising:
- a generally cylindrical core of constant radius (rhead-core-constant) and with a longitudinal axis,
- a single continuous thread encircling the core, the apex of which defines an outer periphery of constant radius (rhead-constant);
- and
- a thread trough;
- and
- (2) a variable angle screw comprising:
- a threaded shank;
- and
- a head fixed to the shank, the head comprising:
- a generally cylindrical core of radius (rhead-core) and with a longitudinal axis,
- a single continuous thread encircling the core, the apex of which defines an outer periphery of radius (rhead);
- and
- a thread trough, wherein the thread has at least one indentation along its length, each indentation having a radius (rhead-indent), wherein rcore<rhead-indent<rhead,
- wherein the system comprises at least one variable angle device selected from the group consisting of the variable angle plate and the variable angle screw.
30 more elements
A variable angle orthopedic system, the system comprising:
- at least one fixed angle fastener defining a longitudinal axis and comprising a threaded head, and a threaded shank fixed to the head;
- and
- an orthopedic plate comprising:
- at least one through hole defining a central hole axis;
- and
- at least one means for receiving the head of the fixed angle fastener in the at least one hole at a 0° angle between the central hole axis and the longitudinal axis and at least one other angle α.
3 more elements
A variable angle orthopedic system, the system comprising:
- a fixed angle plate comprising one or more holes, each hole defining a central hole axis and comprising at least one thread;
- and
- a variable angle fastener defining a longitudinal axis and comprising:
- a threaded head;
- a threaded shank fixed to the head;
- and
- a means for inserting the head in the at least one hole at a 0° angle between the central hole axis and the longitudinal axis and at least one other angle α.
4 more elements
A method of making a variable angle orthopedic plate, the method comprising:
- providing a plate comprising an upper surface and a bone facing surface;
- forming a through hole having a generally cylindrical shape between the upper surface and the bone facing surface;
- forming at least one thread encircling the circumference of the hole at least once, the thread apex defining a central hole aperture of radius (raperture);
- forming at least one trough encircling the circumference of the hole at least once, the thread trough defining a total hole radius of (rhole);
- and
- forming at least one indentation in each of the at least one thread, each indentation having a radius (rindent), wherein raperture<rindent<rhole.
3 more elements
A method of making a variable angle orthopedic fastener, the method comprising:
- providing a generally cylindrical fastener blank defining a longitudinal axis and comprising a proximal end and a distal end;
- forming at least one head thread and trough encircling the circumference of the proximal end of the fastener blank at least once, the apex of each head thread defining an outer periphery of radius (rhead) and the trough of each thread defining a head core of radius (rcore);
- forming at least one indentation in each of the at least one threads, each indentation having a radius (rhead-indent), wherein rcore<rhead-indent<rhead.
Dependencies are inferred from the claim text.