Expandable orthopedic implant system and method

• US 8,425,611 B2
• Filed: 10/26/2010
• Issued: 04/23/2013
• Est. Priority Date: 10/26/2010
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: Dewey, Jonathan, Capote, Marco Dagoberto
• Primary Examiner(s): Hammond, Ellen C
• Assistant Examiner(s): MAHMUD, ATIYA S
• Application Number:
  US12/912,553
• Publication Number:
  US 20120101576A1
• Time in Patent Office: 910 Days
• Field of Search: 623/17.11, 623/17.12, 623/17.15, 623/17.16
• US Class Current: 623/17.16
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2/441 made of inflatable pockets or chambers filled with fluid, e.g. with hydrogel
• CPC Class Codes: A61F 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/484 Fluid means, i.e. hydraulic or pneumatic
• CPC Class Codes: A61F 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• 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 2002/30019 differing in mechanical expandability, e.g. in mechanical, self- or balloon expandability
• CPC Class Codes: A61F 2002/30056 differing in radiographic density
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30092 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30235 tubular, e.g. sleeves
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30581 having a pocket filled with fluid, e.g. liquid
• CPC Class Codes: A61F 2002/30583 filled with hardenable fluid, e.g. curable in-situ
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30601 telescopic
• CPC Class Codes: A61F 2002/3068 the pharmaceutical product being in a reservoir
• CPC Class Codes: A61F 2002/30784 Plurality of holes
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/449 : comprising multiple spinal implants located in different intervertebral spaces or in different vertebrae
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 : Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/0097 : Coating or prosthesis-covering structure made of pharmaceutical products, e.g. antibiotics
• CPC Class Codes: A61F 2310/00976 : Coating or prosthesis-covering structure made of proteins or of polypeptides, e.g. of bone morphogenic proteins BMP or of transforming growth factors TGF

Abstract

An orthopedic implant includes a first member that defines a longitudinal axis, a first wall and a second wall. The first wall defines at least a portion of a chamber. The second wall defines a first graft containment cavity. The chamber is separate from the first graft containment cavity. A second member defines a first wall disposed for sealed engagement with the first wall of the first member. The first wall of the second member defines at least a portion of the chamber. The second member is configured for movement along the longitudinal axis relative to the first member. Methods of use are disclosed.

Claims

1. An orthopedic implant comprising:

a first member defining a longitudinal axis, a first wall and a second wall, the first wall defining at least a portion of a chamber and the second wall defining a first axial face comprising an opening defining a first graft containment cavity, the second wall having a tubular configuration and further defining at least one lateral opening, the chamber being separate from the first graft containment cavity, wherein the first member defines a fluid receiving port configured to communicate with the chamber only, the first member includes a transverse wall separating the chamber and the first graft containment cavity, the transverse wall has a reservoir therein in communication with the chamber, and the implant comprises a lumen connecting the reservoir with the fluid receiving port; and

a second member defining a first wall having an outer surface configured to engage an inner surface of the first wall of the first member such that the first wall of the second member is disposed for sealed engagement with the first wall of the first member, the first wall of the second member defining at least a portion of the chamber, the second member being configured for movement along the longitudinal axis relative to the first member; and

a third member defining a first wall having an outer surface configured to engage an inner surface of the first wall of the second member such that the first wall of the third member is disposed for sealed engagement with the first wall of the second member, the first wall of the third member defining at least a portion of the chamber and a second axial face opposite the first axial face comprising an opening defining a second graft containment cavity, the chamber being separate from the second graft containment cavity, the third member being configured for movement along the longitudinal axis relative to the second member,

wherein the members are disposed in a telescopic arrangement such that the sealed engagement of the members facilitates expansion of the members under a fluid pressure in the chamber for movement between a first orientation and a second orientation such that the first member and the third member are disposed to engage adjacent bone surfaces.

2. The orthopedic implant of claim 1, wherein the first wall of the first member has a tubular configuration.

3. The orthopedic implant of claim 2, wherein the first tubular wall and the second tubular wall are concentric with the longitudinal axis.

4. The orthopedic implant of claim 1, wherein the first wall of the first member has a tubular configuration and the first wall of the second member has a tubular configuration, the first tubular wall of the first member and the first tubular wall of the second member being concentric with the longitudinal axis.

5. The orthopedic implant of claim 4, wherein the first wall of the third member has a tubular configuration, which is concentric with the longitudinal axis.

6. The orthopedic implant of claim 1, wherein the first wall of the third member further defines at least one lateral opening.

7. The orthopedic implant of claim 1, wherein the first wall of the third member further defines a transverse portion, which defines at least a portion of the chamber.

8. The orthopedic implant of claim 1, wherein the members each have a tubular configuration such that the first wall of the third member is configured for slidable disposal within the first wall of the second member, and the first wall of the second member is configured for slidable disposal within the first wall of the first member in the telescopic arrangement.

9. The orthopedic implant of claim 1, wherein in the first orientation the members are disposed in a nested configuration such that the second member and the third member are disposed within the first wall of the first member.

10. The orthopedic implant of claim 1, wherein the members are configured for expansion along the longitudinal axis only.

11. The orthopedic implant of claim 1, wherein the first wall of the first member includes an inner flange, the first wall of the second member includes an inner flange and an outer flange and the first wall of the third member includes an outer flange, such that in the second orientation the inner flange of the first member seals with the outer flange of the second member and the inner flange of the second member seals with the outer flange of the third member.

12. The orthopedic implant of claim 1, wherein the members each have a tubular configuration such that the first wall of the first member is configured for slidable disposal within the first wall of the second member and the first wall of the second member is configured for slidable disposal within the first wall of the third member in the telescopic arrangement.

13. The orthopedic implant of claim 1, further comprising a flexible layer disposed circumferentially about the first walls of the members to define the chamber.

14. The orthopedic implant of claim 13, wherein the flexible layer extends from a first end to a second end, the first end being connected to the first member and the second end being connected to the third member such that in the first orientation, the layer has a collapsed configuration and in the second orientation the layer is expanded along the longitudinal axis.

15. The orthopedic implant of claim 1, wherein the first walls of the members define an interior cavity disposed within a circumference of the chamber and separated from the chamber by the first walls of the members.

16. An orthopedic implant comprising:

a first member defining a longitudinal axis, a first wall and a second wall, the first wall defining at least a portion of a chamber and the second wall defining a first axial face comprising an opening defining a first graft containment cavity, the chamber being separate from the first graft containment cavity, wherein the first member defines a fluid receiving port configured to communicate with the chamber only, the first member includes a transverse wall separating the chamber and the first graft containment cavity, the transverse wall has a reservoir therein in communication with the chamber, and the implant comprises a lumen connecting the reservoir with the fluid receiving port;

a second member defining a first wall having an outer surface configured to engage an inner surface of the first wall of the first member such that the first wall of the second member is disposed for sealed engagement with the first wall of the first member, the first wall of the second member defining at least a portion of the chamber, the second member being configured for movement along the longitudinal axis relative to the first member; and

a third member defining a first wall having an outer surface configured to engage an inner surface of the first wall of the second member such that the first wall of the third member is disposed for sealed engagement with the first wall of the second member, the first wall of the third member defining at least a portion of the chamber and a second axial face opposite the first axial face comprising an opening defining a second graft containment cavity, the chamber being separate from the second graft containment cavity, the third member being configured for movement along the longitudinal axis relative to the second member; and

a flexible layer disposed circumferentially about the first wall of the members to define the chamber, the members and the flexible layer are expandable under a fluid pressure in the chamber for movement between a first orientation and a second orientation such that the first member and the third member are disposed to engage adjacent bone surfaces.

17. An orthopedic implant system comprising:

a first cylinder defining a longitudinal axis, a first tubular portion, a second tubular portion and a transverse wall therebetween, the first tubular portion defining at least a portion of a chamber and the second tubular portion including a plurality of openings and defining a first axial face comprising an opening defining a first graft containment cavity, the chamber being separate from the first graft containment cavity by the transverse wall, the first cylinder further defining a fluid receiving port configured to communicate with the chamber;

a second cylinder defining a first tubular portion having an outer surface configured to engage an inner surface of the first tubular portion of the first cylinder such that the first tubular portion of the second cylinder is disposed for sealed engagement with the first tubular portion of the first cylinder, the first tubular portion of the second cylinder defining at least a portion of the chamber, the second cylinder being configured for movement along the longitudinal axis relative to the first cylinder; and

a third cylinder defining a first tubular portion having an outer surface configured to engage an inner surface of the first tubular portion of the second cylinder such that the first tubular portion of the third cylinder is disposed for sealed engagement with the first tubular portion of the second cylinder, the first tubular portion of the third cylinder defining at least a portion of the chamber and including a plurality of openings and a second axial face opposite the first axial face, the second axial face comprising an opening defining a second graft containment cavity, the chamber being separate from the second graft containment cavity, the third cylinder being configured for movement along the longitudinal axis relative to the second cylinder; and

bone graft configured for disposal in the first graft containment cavity and/or the second graft containment cavity,

wherein the cylinders are concentric with the longitudinal axis and disposed in a telescopic arrangement such that the sealed engagement of the cylinders facilitates expansion of the cylinders under a fluid pressure in the chamber for movement between a first orientation such that the cylinders are disposed in a nested configuration and a second orientation such that the first cylinder and the third cylinder are disposed to engage adjacent bone surfaces.