US 2014/0277554 A1Published application

Hammertoe Implant with Enhanced Gripping Surfaces

AssigneeArrowhead Medical Device Technologies, LLC

InventorsScott R. Roman, Thomas J. Twardzik

Life of this patent

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Abstract

An intramedullary fixation device used in bone fixation and stabilization on a patient includes a longitudinally extending rigid body, a distal head disposed at a distal end of the body and sized for insertion into an intramedullary canal of a phalanx of the patient, the distal head having a central core portion and a plurality of extending distal wings radially projecting from the central core portion. A proximal head at a proximal end of the body is sized for insertion into an intramedullary canal of a phalanx of the patient. It has a central core portion and a plurality of proximal wings extending radially outwardly from the central core portion.

Claims28

Dependent claims

An intramedullary fixation device used in bone fixation and stabilization, comprising:

an arrowhead-shaped distal head comprising a distal end having a distal tip, the distal head having first, second, third, and fourth outwardly facing side surfaces forming a pyramidal shape, the first and third side surfaces being opposed from each other and forming a first angle, and the second and fourth side surfaces being opposed from each other and forming a second angle, the second angle being different than the first angle, each of the first and third side surfaces having a proximally projecting edge forming a tip of a barb, the barbs being configured to engage tissue and inhibit rotational movement and inhibit axial movement of the distal head in a proximal direction, the distal head having a first dimensional width measured between proximally projecting edges of the first and third side surfaces;
an arrowhead-shaped proximal head comprising a proximal end having a proximal tip, the proximal head having fifth, sixth, seventh, and eighth outwardly facing side surfaces, the fifth and seventh side surfaces being opposed from each other and forming a third angle, and the sixth and eighth side surfaces being opposed from each other and forming a fourth angle, the third angle being different than the fourth angle, each of the fifth and seventh side surfaces having a distally projecting edge, the proximal head comprising a trailing edge surface intersecting the distally projecting edge of the fifth and seventh side surfaces, the trailing edge surface extending in a direction substantially perpendicular to a longitudinal direction of the proximal head and intersecting with a neck region, the proximal head having a second dimensional width measured between distally projecting edges of the fifth and seventh side surfaces, the second dimensional width being within the range of about 1.3-1.5 times the first dimensional width;
and
a rigid body extending between and connecting the distal head and the proximal head, the rigid body having a neck region joined to the trailing edge surface of the proximal head in a manner that the trailing edge surface is perpendicular to a longitudinal axis of the body, the body having a rigidity sufficient to withstand bending loading applied by the phalanges.

1 more element

An intramedullary fixation device used in bone fixation and stabilization on a patient, comprising:

a longitudinally extending rigid body having a rigidity sufficient to withstand bending loading applied by the phalanges, the rigid body having a longitudinal axis extending through at a least a portion of the body;
a distal head disposed at a distal end of the body and sized for insertion into an intramedullary canal of a phalanx of the patient, the distal head having a central core portion and a plurality of extending distal wings radially projecting from the central core portion,
each distal wing comprising an outer surface portion having an outer perimeter surface portion and a curved leading surface portion, the curved leading surface portion curving from the outer perimeter surface portion and smoothly intersecting at the central core portion of the distal head, each wing of the distal head also comprising a proximally facing trailing surface portion substantially perpendicular to the longitudinal axis of the rigid body, the distal head having a first maximum diameter defined by the outer perimeter surface portion of the distal wings and a first wing length;
and
a proximal head at a proximal end of the body and sized for insertion into an intramedullary canal of a phalanx of the patient, the proximal head having central core portion and a plurality of proximal wings extending radially outwardly from the central core portion,
each proximal wing comprising an outer surface portion having an outer perimeter surface portion and a curved leading surface portion, the curved leading surface portion curving from the outer perimeter surface portion and smoothly intersecting at the central core portion of the proximal head, each proximal wing also comprising a distally facing trailing surface portion substantially perpendicular to the longitudinal axis of the rigid body, the proximal head having a second maximum diameter defined by the outer perimeter surface portion of the distal wings and a second wing length, wherein the first maximum diameter of the distal wings is less than the second maximum diameter of the proximal wings, and wherein first wing length of the distal wings is greater than the second wing length of the proximal wings.

3 more elements

An intramedullary fixation device used in bone fixation and stabilization on a patient, comprising:

a longitudinally extending rigid body having a rigidity sufficient to withstand bending loading applied by the phalanges, the rigid body having a longitudinal axis extending through at a least a portion of the body;
a distal head disposed at a distal end of the body and sized for insertion into an intramedullary canal of a phalanx of the patient, the distal head having a central core portion and a plurality of extending distal wings radially projecting from the central core portion, the central core portion having an outer surface smoothly intersecting with the adjacent distal wings and including a leading nub,
each distal wing comprising an outer surface portion having an outer perimeter surface portion and a curved leading surface portion, the curved leading surface portion curving from the outer perimeter surface portion and smoothly intersecting at the central core portion of the distal head, each wing of the distal head also comprising a proximally facing trailing surface portion substantially perpendicular to the longitudinal axis of the rigid body, the distal head having a first maximum diameter defined by the outer perimeter surface portion of the distal wings and a first wing length;
and
a proximal head at a proximal end of the body and sized for insertion into an intramedullary canal of a phalanx of the patient, the proximal head having central core portion and a plurality of proximal wings extending radially outwardly from the central core portion, the central core portion having an outer surface smoothly intersecting with the adjacent distal wings and including a leading nub,
each proximal wing comprising an outer surface portion having an outer perimeter surface portion and a curved leading surface portion, the curved leading surface portion curving from the outer perimeter surface portion and smoothly intersecting at the central core portion of the proximal head, each proximal wing also comprising a distally facing trailing surface portion substantially perpendicular to the longitudinal axis of the rigid body, the proximal head having a second maximum diameter defined by the outer perimeter surface portion of the distal wings and a second wing length, wherein the first maximum diameter of the distal wings is less than the second maximum diameter of the proximal wings, and wherein first wing length of the distal wings is greater than the second wing length of the proximal wings, wherein the device has an overall length, and the proximal and distal heads form not more than about 25% of the overall length.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/206,171Filed 12 Mar 2014
Priority: 13 Mar 2013
Published: 18 Sep 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

A61B 17/7291
Intramedullary devices, e.g. pins or nails: for small bones, e.g. in the foot, ankle, hand or wrist
A61B 17/7233
Intramedullary devices, e.g. pins or nails: with special means of locking the nail to the bone
A61B 17/7283
Intramedullary devices, e.g. pins or nails: with special cross-section of the nail
A61F 2/4225
For wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes: for feet, e.g. toes

Family

Application61/780,360Us provisional application · filed 13 Mar 2013
US 9,452,002 B2Related patent
US 2014/0277554 A1This patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

An intramedullary fixation device used in bone fixation and stabilization, comprising:

an arrowhead-shaped distal head comprising a distal end having a distal tip, the distal head having first, second, third, and fourth outwardly facing side surfaces forming a pyramidal shape, the first and third side surfaces being opposed from each other and forming a first angle, and the second and fourth side surfaces being opposed from each other and forming a second angle, the second angle being different than the first angle, each of the first and third side surfaces having a proximally projecting edge forming a tip of a barb, the barbs being configured to engage tissue and inhibit rotational movement and inhibit axial movement of the distal head in a proximal direction, the distal head having a first dimensional width measured between proximally projecting edges of the first and third side surfaces;
an arrowhead-shaped proximal head comprising a proximal end having a proximal tip, the proximal head having fifth, sixth, seventh, and eighth outwardly facing side surfaces, the fifth and seventh side surfaces being opposed from each other and forming a third angle, and the sixth and eighth side surfaces being opposed from each other and forming a fourth angle, the third angle being different than the fourth angle, each of the fifth and seventh side surfaces having a distally projecting edge, the proximal head comprising a trailing edge surface intersecting the distally projecting edge of the fifth and seventh side surfaces, the trailing edge surface extending in a direction substantially perpendicular to a longitudinal direction of the proximal head and intersecting with a neck region, the proximal head having a second dimensional width measured between distally projecting edges of the fifth and seventh side surfaces, the second dimensional width being within the range of about 1.3-1.5 times the first dimensional width;
and
a rigid body extending between and connecting the distal head and the proximal head, the rigid body having a neck region joined to the trailing edge surface of the proximal head in a manner that the trailing edge surface is perpendicular to a longitudinal axis of the body, the body having a rigidity sufficient to withstand bending loading applied by the phalanges.

1 more element

Facts

Application

14/206,171Filed 12 Mar 2014

Priority

13 Mar 2013

Published

18 Sep 2014

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

A61B 17/7291
Intramedullary devices, e.g. pins or nails: for small bones, e.g. in the foot, ankle, hand or wrist
A61B 17/7233
Intramedullary devices, e.g. pins or nails: with special means of locking the nail to the bone
A61B 17/7283
Intramedullary devices, e.g. pins or nails: with special cross-section of the nail
A61F 2/4225
For wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes: for feet, e.g. toes