Adjustable bone fusion implant and method

• US 20030130739A1
• Filed: 03/05/2003
• Published: 07/10/2003
• Est. Priority Date: 10/17/2001
• Status: Active Grant

• Current Assignee: IMDS LLC
• Original Assignee: Medicinelodge, Inc (Nelso Antolotti)
• Inventors: Fallin, T. Wade, Gerbec, Daniel E., Faciszewski, Tom
• Granted Patent: US 6,852,129 B2
• Time in Patent Office: Days
• US Class Current: 623/17.15
• CPC Class Codes: A61B 2017/0256 for the spine
• CPC Class Codes: A61F 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2/4601 for introducing bone substitute, for implanting bone graft implants or for compacting them in the bone cavity
• CPC Class Codes: A61F 2/4603 for insertion or extraction of endoprosthetic joints or of accessories thereof
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2/4637 for connecting or disconnecting two parts of a prosthesis
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30266 wedge-shaped parallelepipeds
• CPC Class Codes: A61F 2002/30487 Circumferential cooperating grooves and beads on cooperating lateral surfaces of a mainly longitudinal connection
• CPC Class Codes: A61F 2002/3052 unrestrained in only one direction, e.g. moving unidirectionally
• CPC Class Codes: A61F 2002/30522 releasable, e.g. using a releasable ratchet
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30556 for adjusting thickness
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30774 internally-threaded
• CPC Class Codes: A61F 2002/30777 Oblong apertures
• CPC Class Codes: A61F 2002/30784 Plurality of holes
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30789 perpendicular with respect to each other
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30892 : parallel
• CPC Class Codes: A61F 2002/30975 : made of two halves
• CPC Class Codes: A61F 2002/4622 : having the shape of a forceps or a clamp
• CPC Class Codes: A61F 2002/4627 : with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2002/4628 : with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping
• CPC Class Codes: A61F 2002/4629 : connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2002/4635 : using minimally invasive surgery
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0082 : parallelepipedal
• CPC Class Codes: A61F 2250/0009 : for adjusting thickness

Abstract

An adjustable bone fusion implant includes a housing having a top surface, a bottom surface, and a pair of spaced apart expandable sidewalls extending therebetween. The top surface, bottom surface, and pair of expandable sidewalls at least partially bound a compartment therebetween. A discrete reinforcing member has a predetermined shape. The reinforcing member is selectively positioned within or outside of the compartment such that a compressive force applied on the top surface and bottom surface of the housing is transferred through the reinforcing member.

Claims

1. An adjustable bone fusion implant comprising:

a first plate having an interior face and an opposing exterior face;

a second plate having an interior face and an opposing exterior face;

means for connecting the first plate to the second plate such that the first plate and the second plate can be selectively manually separated and such that the first plate and the second plate are mechanically stopped from collapsing toward each other once separated; and

a discrete reinforcing member of a predetermined shape selectively positioned between the first plate and the second plate.

2. An adjustable bone fusion implant as recited in claim 1, wherein the discrete reinforcing member is removably slid between the first plate and the second plate.

3. An adjustable bone fusion implant as recited in claim 1, wherein the reinforcing member is positioned between the first plate and the second plate such that the reinforcing member biases directly against the first plate and the second plate when a compressive force is applied on the first plate and the second plate.

4. An adjustable bone fusion implant as recited in claim 1, wherein the means for connecting comprises:

a pair of spaced apart first support members projecting from the first plate, at least one of the first support members having a plurality of teeth projecting therefrom; and

a pair of spaced apart second support members projecting from the second plate, at least one of the second support members having at least one hole or one tooth formed thereon, at least one of the plurality of teeth of the first support member being disposed within the hole or against the tooth of the second support member.

5. An adjustable bone fusion implant as recited in claim 1, wherein the exterior face of the first plate is angled relative to the exterior face of the second plate so as to form a wedged shape configuration.

6. An adjustable bone fusion implant as recited in claim 1, further comprising:

an attachment wall projecting from the first plate or the second plate toward the other of the first plate or the second plate; and

means formed on the attachment wall for removably connecting an insertion tool to the attachment wall.

7. An adjustable bone fusion implant as recited in claim 1, further comprising at least one grafting port extending through at least the first plate or the second plate.

8. An adjustable bone fusion implant as recited in claim 1, wherein the reinforcing member comprises a block having a front face and an opposing back face with a passageway extending therebetween.

9. An adjustable bone fusion implant as recited in claim 1, wherein the reinforcing member comprises a pair of spaced apart walls with a substantially open channel longitudinally extending therebetween.

10. An adjustable bone fusion implant as recited in claim 1, wherein a compartment is at least partially bounded between the first plate and the second plate, the reinforcing member being at least partially disposed within the compartment.

11. An adjustable bone fusion implant as recited in claim 1, wherein the reinforcing member has a substantially U-shaped configuration.

12. An adjustable bone fusion implant comprising:

a housing comprising a top surface, a bottom surface and a pair of spaced apart expandable sidewalls extending therebetween, the top surface, bottom surface, and pair of expandable sidewalls at least partially bounding a compartment therebetween; and

a discrete reinforcing member having a predetermined shape, the reinforcing member being selectively positioned within the compartment of the housing such that a compressive force applied on the top surface and bottom surface of the housing is transferred through the reinforcing member.

13. An adjustable bone fusion implant as recited in claim 12, wherein the reinforcing member is removably positioned within the compartment of the housing.

14. An adjustable bone fusion implant as recited in claim 12, wherein the reinforcing member is slid within the compartment of the housing without rotation.

15. An adjustable bone fusion implant as recited in claim 12, wherein the reinforcing member comprises a block having a front face and an opposing back face with a passageway extending therebetween.

16. An adjustable bone fusion implant as recited in claim 12, wherein the reinforcing member comprises a pair of spaced apart walls with a substantially open channel longitudinally extending therebetween.

17. An adjustable bone fusion implant as recited in claim 12, wherein the reinforcing member is comprised of plastic, metal, or bone.

18. An adjustable bone fusion implant as recited in claim 12, wherein the expandable sidewalls comprise:

a pair of spaced apart first support members each having a plurality of teeth projecting therefrom; and

a pair of spaced apart second support members each having at least one hole or at least one tooth formed thereon, at least one of the plurality of teeth of each of the first support members being disposed within the at least one hole or against the at least one tooth of each second support member.

19. An adjustable bone fusion implant as recited in claim 12, wherein the top surface of the housing is angled relative to the bottom surface of the housing so that the housing has a substantially wedged shaped configuration.

20. An adjustable bone fusion implant comprising:

a housing comprising a top plate, a bottom plate, and a pair of spaced apart expandable sidewalls extending therebetween, the top plate and the bottom plate at least partially bounding a compartment therebetween; and

a discrete reinforcing member having a predetermined shape, the reinforcing member being selectively positioned between the top plate and the bottom plate such that a compressive force applied on the top plate and bottom plate of the housing is transferred through the reinforcing member along at least substantially the entire length of the reinforcing member.

21. An adjustable bone fusion implant as recited in claim 20, wherein the reinforcing member extends along the expandable sidewalls outside of the chamber.

22. An adjustable bone fusion implant as recited in claim 20, wherein the reinforcing member is disposed within the chamber.

23. An adjustable bone fusion implant as recited in claim 20, wherein the reinforcing member is disposed within the chamber and directly biased against the top plate and the bottom plate when the compressive force is applied to the top plate and the bottom plate.

24. An adjustable bone fusion implant as recited in claim 20, wherein the reinforcing member comprises a pair of spaced apart walls with a substantially open channel longitudinally extending therebetween.

25. An adjustable bone fusion implant as recited in claim 20, wherein at least one of the expandable sidewalls comprises:

a first support member having a plurality of teeth projecting therefrom; and

a second support member having at least one hole or at least one tooth formed thereon, at least one of the plurality of teeth of the first support member being disposed within the at least one hole or against the at least one tooth of the second support member.

26. An adjustable bone fusion implant comprising:

a housing comprising a top plate, a bottom plate, and a pair of spaced apart expandable sidewalls extending therebetween, the top plate and the bottom plate at least partially bounding a compartment therebetween, the housing having a first end with a first height and an opposing second end with a second height, the second height being greater that the first height; and

a discrete reinforcing member having a predetermined shape, the reinforcing member being selectively positioned between the top plate and the bottom.

27. An adjustable bone fusion implant as recited in claim 26, wherein the housing has a substantially wedge shaped configuration.

28. An adjustable bone fusion implant as recited in claim 26, wherein the housing has a substantially wedge shaped configuration when the sidewalls are fully collapsed and when the sidewalls are fully expanded.

29. An adjustable bone fusion implant as recited in claim 26, wherein the reinforcing member is disposed within the chamber and directly biased against the top plate and the bottom plate when a compressive force is applied to the top plate and the bottom plate.

30. An adjustable bone fusion implant as recited in claim 26, wherein the reinforcing member comprises a pair of spaced apart walls with a substantially open channel longitudinally extending therebetween.

31. An adjustable bone fusion implant as recited in claim 26, wherein at least one of the expandable sidewalls comprises:

a first support member having a plurality of teeth projecting therefrom; and

a second support member having at least one hole or at least one tooth formed thereon, at least one of the plurality of teeth of the first support member being disposed within the at least one hole or against the at least one tooth of the second support member.

32. An adjustable bone fusion implant kit comprising:

a housing comprising a top plate, a bottom plate, and a pair of spaced apart expandable sidewalls extending therebetween, the top plate and the bottom plate at least partially bounding a compartment therebetween, the expandable sidewalls being selectively expandable so that the housing is correspondingly expandable between a plurality of sizes; and

a plurality of discrete reinforcing members, each reinforcing member having a different size corresponding to one of the plurality of sizes of the housing, each of the reinforcing members being configured to be selectively inserted between the top plate and the bottom plate of the housing when the housing is adjusted to the size of the corresponding reinforcing member.

33. An adjustable bone fusion implant kit as recited in claim 32, wherein the reinforcing members are configured to be disposed within the compartment of the housing.

34. An adjustable bone fusion implant kit as recited in claim 32, wherein the reinforcing members are configured to extend along at least one of the expandable sidewalls of the housing outside of the chamber.

35. An adjustable bone fusion implant kit as recited in claim 32, wherein at least one of the reinforcing members comprises a pair of spaced apart walls with a substantially open channel longitudinally extending therebetween.

36. An adjustable bone fusion implant kit as recited in claim 32, wherein at least one of the expandable sidewalls comprises:

a first support member having a plurality of teeth projecting therefrom; and

a second support member having at least one hole or at least one tooth formed thereon, at least one of the plurality of teeth of the first support member being disposed within the at least one hole or against the at least one tooth of the second support member.