Lower extremity fusion devices and methods

Patent metadata

Field	Value
Publication number	US-9603640-B2
Application number	US-201213982152-A
Country	US
Kind code	B2
Filing date	Jan 26, 2012
Priority date	Jan 26, 2011
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A fusion implant and fusion members for fusing target fusion bones of a lower extremity. The fusion implant including internally threaded apertures of a first thread lead, and fusion members including threading of the first thread lead and threading of a second thread lead that is less than the first thread lead. The fusion implant and a targeting instrument being configured to couple to one another in a predefined orientation. The predetermined orientation resulting in alignment of aspects of the fusion implant with aspects of the targeting instrument. The targeting instrument providing both distraction and compression to the joint between the target fusion bones. A guide instrument for preparing one of the target fusion bones for fusion thereof. A surgical method for applying compression to the joint between the target fusion bones to facilitate fusion thereof utilizing a fusion implant, fusion members, a targeting instrument and a guide instrument.

First claim

What is claimed is:

1. A fusion device for use with bones of a lower extremity, the fusion device including:
a fusion implant configured for implantation into a cavity in at least one bone, the fusion implant including:
a first end including an attachment mechanism configured to couple with an instrument in a predefined first orientation;
a second end substantially opposing the first end; and
a body extending longitudinally between the first end and the second end and defining a longitudinal axis, a first portion of the body adjacent the first end including exterior threading and a second portion of the body adjacent the second end including exterior threading, an intermediate portion of the body between the first portion and the second portion including a non-threaded exterior surface, the body further including at least two internally threaded apertures including a first thread lead extending laterally through the body, the at least two internally threaded apertures including a first threaded aperture proximate the first end and extending linearly from a first side surface to a second side surface of a medial portion and defining a first lateral axis, and a second threaded aperture proximate the second end and extending linearly from a third side surface to a fourth side surface of the medial portion and defining a second lateral axis, the first side surface and the third side surface being spaced about the longitudinal axis of the body; and

at least two longitudinally extending bone fusion members including a tip, a head and a body extending longitudinally between the tip and the head, the body including:
a first externally threaded portion adjacent the tip including the first thread lead and being otherwise configured to couple to the at least two threaded apertures of the body of the fusion implant; and
a second externally threaded portion adjacent the head including a second thread lead that is less than the first thread lead and an external taper extending from the head to a non-threaded portion, the non-threaded portion extending between the first and second externally threaded portions.

2. The fusion device of claim 1 , wherein the first side surface and the third side surface are spaced about the longitudinal axis of the body by at least about 10 degrees.

3. The fusion device of claim 1 , wherein the first internally threaded aperture is oriented such that the first lateral axis angles away from the first end as it extends from the first side surface to the second side surface.

4. The fusion device of claim 1 , wherein the second internally threaded aperture is oriented such that the second lateral axis angles toward the second end as it extends from the third side surface to the fourth side surface.

5. The fusion device of claim 4 , wherein the first internally threaded aperture is oriented such that the first lateral axis angles toward the first end as it extends from the first side surface to the second side surface.

6. The fusion device of claim 1 , wherein the at least two internally threaded apertures further include a third internally threaded aperture positioned between the second internally threaded aperture and the second end, the third internally threaded aperture extending linearly from a fifth side surface to a sixth side surface and at least partially through the second threaded portion and defining a third lateral axis.

7. The fusion device of claim 6 , wherein the fifth side surface is spaced between the first side surface and the third side surface about the longitudinal axis of the body.

8. The fusion device of claim 7 , wherein the angle between the first lateral axis of the first internally threaded aperture and the longitudinal axis of the body adjacent the first side surface and first end of the body is within the range of about 77 degrees to about 94 degrees, the angle between the second lateral axis of the second internally threaded aperture and the longitudinal axis of the body adjacent the third side surface and first end of the body is within the range of about 69 degrees to about 83 degrees, and the angle between the third lateral axis of the third internally threaded aperture and the longitudinal axis of the body adjacent the third side surface and first end of the body is within the range of about 55 degrees to about 69 degrees.

9. The fusion device of claim 1 , wherein the first threaded portion and the non-threaded portion of the at least two bone fusion members define a first outer diameter, and the second threaded portion of the at least two bone fusion members defines a second outer diameter adjacent the head that is greater than the first outer diameter.

Assignees

• Palmer Andrew K
• Brief Andrew Ariel
• Sibel Roman Adrian
• Palmer Kevin
• Heilala Matt Andrew
• Surma Gabriel
• Guzman Pamela C
• Pile Mary
• Nextremity Solutions Inc

Inventors

• Palmer Andrew K
• Brief Andrew Ariel
• Sibel Roman Adrian
• Palmer Kevin
• Heilala Matt Andrew
• Surma Gabriel
• Guzman Pamela C
• Pile Mary

Classifications

• A61F2/4225

  for feet, e.g. toes · CPC title

• A61B17/1739

  specially adapted for particular parts of the body · CPC title

• A61B17/8645

  Headless screws, e.g. ligament interference screws · CPC title

• A61F2/4202

  for ankles · CPC title

• A61F2002/30622

  Implant for fusing a joint or bone material · CPC title