Fusion stabilization chamber

• US 5,405,391 A
• Filed: 02/16/1993
• Issued: 04/11/1995
• Est. Priority Date: 02/16/1993
• Status: Expired due to Term

• Current Assignee: Fraser C. Hednerson, John W. Newman, Rebecca S. Henderson
• Original Assignee: Fraser C. Hednerson, John W. Newman, Rebecca S. Henderson
• Inventors: Newman, John W., Hednerson, Fraser C., Henderson, Rebecca S.
• Primary Examiner(s): Willse, David H.
• Application Number:
  US08/018,373
• Time in Patent Office: 784 Days
• Field of Search: 623/17, 623/16, 403/109, 606/61, 606/63, 606/72, 623/16
• US Class Current: 623/17.15
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• 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 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 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30158 trapezoidal
• CPC Class Codes: A61F 2002/30261 parallelepipedal
• CPC Class Codes: A61F 2002/3028 polyhedral different from parallelepipedal and pyramidal
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30373 with additional means for preventing said translation
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30576 with extending fixation tabs
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30601 telescopic
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30909 Nets
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/0041 : using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2230/0019 : rectangular
• CPC Class Codes: A61F 2230/0026 : trapezoidal
• CPC Class Codes: A61F 2230/0063 : Three-dimensional shapes
• CPC Class Codes: A61F 2230/0082 : parallelepipedal
• CPC Class Codes: Y10S 606/907 : Composed of particular material or coated
• CPC Class Codes: Y10T 403/32491 : Threaded

Abstract

A fusion stabilization chamber stabilizes the spine following removal of one or more vertebrae, and facilitates bone growth. The chamber includes two hollow members, preferably having slightly trapezoidal cross-sections, which slide relative to each other in a telescoping manner. The hollow members preferably have walls made of a metal mesh. Barrel vaults attached to the hollow members form guides for screws which can attach the chamber to the vertebrae adjacent the corpectomy site. Because of its adjustability, the chamber can fit a wide variety of corpectomy sites. One can fill the chamber with bone material, which can eventually fuse to the adjacent bone. A pair of stabilizing plates prevents the surgeon from pushing the chamber too far towards the spinal cord. The chamber eliminates the need to maintain a large and costly inventory of screws, and neurosurgeons can learn to use it quickly and easily.

Claims

1. A fusion stabilization chamber, comprising:

a) first and second hollow members, the first hollow member being slidable within the second hollow member,

b) both hollow members including at least one barrel vault for receiving a screw therein, at least one barrel vault of the first hollow member being mutually oblique to at least one barrel vault of the second hollow member, the hollow members being substantially filled with bone chips,

c) wherein each hollow member is defined by walls formed of a metal mesh, the mesh defining openings sufficiently large to allow the bone chips located within the hollow member to fuse with bone material located outside the hollow member.

2. The fusion stabilization chamber of claim 1, wherein each barrel vault includes a screw threaded therein.

3. The fusion stabilization chamber of claim 1, further comprising means for locking the two hollow members in a position such that the hollow members together define a predetermined volume.

4. The fusion stabilization chamber of claim 1, wherein each hollow member is attached to a stabilizing plate, the stabilizing plates lying in generally the same plane, each stabilizing plate extending longitudinally outward from the hollow member.

5. The fusion stabilization chamber of claim 4, wherein at least one stabilizing plate has a threaded hole, and a screw inserted through said threaded hole.

6. The fusion stabilization chamber of claim 5, wherein each barrel vault includes a screw threaded therein.

7. The fusion stabilization chamber of claim 1, wherein the hollow members have a slightly trapezoidal cross-section.

8. A fusion stabilization chamber, comprising:

a) first and second hollow members, the first hollow member being slidable within the second hollow member, the hollow members having a slightly trapezoidal cross-section, the hollow members being substantially filled with bone chips,

b) both hollow members including at least two threaded barrel vaults with screws threaded in the barrel vaults, the barrel vaults of the first hollow being oblique to the barrel vaults of the second hollow member,

c) the hollow members being formed generally of a metal mesh, and

d) means for locking the two hollow members in a position such that the hollow members together define a predetermined volume.

9. The fusion stabilization chamber of claim 8, wherein each hollow member is attached to a stabilizing plate, the stabilizing plates lying in generally the same plane, each stabilizing plate extending longitudinally outward from the hollow member.

10. The fusion stabilization chamber of claim 9, wherein the stabilizing plates have threaded holes, and wherein there are screws inserted through said threaded holes.

11. A fusion stabilization chamber, comprising:

a) first and second hollow members, the first member being movable with respect to the second member, both hollow members being substantially filled with bone chips, wherein substantially all of each hollow member is formed of a metal mesh, the mesh defining openings sufficiently large to allow the bone chips located within the hollow member to fuse with bone material located outside the hollow member, the fusion stabilization chamber also including means for fixing the first and second members in a desired position relative to each other, and

b) means, attached to the first and second members, for affixing said first and second members to vertebrae adjacent a corpectomy site.

12. A fusion stabilization chamber, comprising:

a) first and second hollow members, the first hollow member being slidable within the second hollow member, the hollow members both having longitudinal axes, the hollow members being curved along their longitudinal axes, wherein the fusion stabilization chamber has a curvature which corresponds to a curvature of a patient'"'"'s spine,

b) both hollow members including at least one barrel vault for receiving a screw therein, at least one barrel vault of the first hollow member being mutually oblique to at least one barrel vault of the second hollow member, the hollow members being substantially filled with bone chips,

c) wherein each hollow member is defined by walls formed of a metal mesh, the mesh defining openings sufficiently large to allow the bone chips located within the hollow member to fuse with bone material located outside the hollow member.

13. A fusion stabilization chamber, comprising:

a) first and second hollow members, the first member being movable with respect to the second member, both hollow members being substantially filled with bone chips, wherein substantially all of each hollow member is formed of a metal mesh, the mesh defining openings sufficiently large to allow the bone chips located within the hollow member to fuse with bone material located outside the hollow member, the fusion stabilization chamber also including means for fixing the first and second members in a desired position relative to each other, and

b) means, attached to the first and second members, for affixing said first and second members to vertebrae adjacent a corpectomy site,

wherein both hollow members have longitudinal axes, the hollow members being curved along their longitudinal axes, wherein the fusion stabilization chamber has a curvature which corresponds to a curvature of a patient'"'"'s spine.