Distractable corpectomy device

• US 6,866,682 B1
• Filed: 09/02/1999
• Issued: 03/15/2005
• Est. Priority Date: 09/02/1999
• Status: Expired due to Term

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Stryker Spine
• Inventors: Harrington, Todd, Crozet, Yves, An, Howard
• Primary Examiner(s): Pellegrino, Brian E
• Application Number:
  US09/388,726
• Time in Patent Office: 2,021 Days
• Field of Search: 623/17.11, 623/17.15, 623/17.16, 623/20.25, 606/63, 606/105, 606/61, 248/188.4, 248/188.5, 248/125.8, 403/46, 411/282, 411/283, 411/324, 411/433, 411/437
• US Class Current: 623/17.15
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• 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 2002/30014 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2002/3011 Cross-sections or two-dimensional shapes
• CPC Class Codes: A61F 2002/30113 circular
• CPC Class Codes: A61F 2002/30116 partial circles, i.e. circular segments
• CPC Class Codes: A61F 2002/30154 square
• CPC Class Codes: A61F 2002/30156 triangular
• CPC Class Codes: A61F 2002/3023 wedge-shaped cylinders
• CPC Class Codes: A61F 2002/30487 Circumferential cooperating grooves and beads on cooperating lateral surfaces of a mainly longitudinal connection
• CPC Class Codes: A61F 2002/30492 using a locking pin
• CPC Class Codes: A61F 2002/30495 using a locking ring
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/3052 unrestrained in only one direction, e.g. moving unidirectionally
• CPC Class Codes: A61F 2002/30528 Means for limiting said movement
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30574 with an integral complete or partial collar or flange
• CPC Class Codes: A61F 2002/30601 telescopic
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30777 : Oblong apertures
• CPC Class Codes: A61F 2002/30785 : parallel
• CPC Class Codes: A61F 2002/30787 : inclined obliquely 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 2002/448 : comprising multiple adjacent spinal implants within the same intervertebral space or within the same vertebra, e.g. comprising two adjacent spinal implants
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0002 : Two-dimensional shapes, e.g. cross-sections
• CPC Class Codes: A61F 2230/0006 : circular
• CPC Class Codes: A61F 2230/0021 : square
• CPC Class Codes: A61F 2230/0023 : triangular
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2250/0018 : differing in elasticity, stiffness or compressibility
• 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 2310/00179 : Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00353 : Bone cement, e.g. polymethylmethacrylate or PMMA

Abstract

A corpectomy device has an inner member telescopingly disposed in an outer member so that the inner member is movable in an axial direction. The inner and outer members are hollow, defining a chamber, and include apertures in communication with the chamber. A locking clip engages the inner and outer members to fix the position of the inner member with respect to the outer member. The longitudinal dimension of the device is adjustable by distracting the inner member so that the inner member extends from the outer member and moving the locking clip from an unlocked position to a locked position.

Claims

1. A corpectomy device, comprising

a first member having a longitudinal axis and a second member,

the first member and the second member being engagable to spinal vertebrae, and

moveable with respect to one another in an axial directions;

and

a locking clip rotatably mounted on the first member and moveable between

a first unlocked position for allowing the first member and the second member to controllably move in the axial direction with respect to one another, and

a second locked position in which the locking clip prevents relative axial movement between the first and second member in a direction along said longitudinal axis.

2. The corpectomy device of claim 1, wherein said locking clip includes at least one depression and said second member includes at least one ridge engagable in said at least one depression for locking said first member and said second member in a relative position with respect to one another.

3. The corpectomy device of claim 1, wherein said locking clip and said second member include interengaging threads for locking said first member and said second member in a relative axial position with respect to one another.

4. The corpectomy device of claim 3 wherein said locking clip is rotatably mounted on said first member for rotation into and out of engagement with said threads.

5. The corpectomy device of claim 1, wherein said first member comprises a hollow member, said first member and said second member defining a chamber therebetween.

6. The corpectomy device of claim 5, wherein said second member is slidably and telescopingly received in a passageway of said first member for movement in said axial direction.

7. The corpectomy device of claim 6, wherein said first member and said second member have a common, longitudinal axis and said locking clip is translatably movable to said locked position in a direction transverse to said axis.

8. The corpectomy device of claim 6, wherein said locking clip includes a first bore and said first member includes a corresponding hole, said first bore and hole being engagable by a screw for locking the position of said locking clip in its locked position.

9. The corpectomy device of claim 6, wherein said first member and said second member include perforations for permitting ingrowth of bone, blood vessels and other tissue.

10. The corpectomy device of claim 1, wherein said first member comprises a hollow member having a longitudinal axis and perforations for permitting ingrowth of bone, blood vessels and other tissue, said second member moveable in an axial direction with respect to said first member and having perforations for permitting ingrowth of bone, blood vessels and other tissue, said second member defining a chamber with said first member for movement in said axial direction;

and said perforations include;

a) elongated perforations extending in the axial direction on one of said first member and said second member; and

b) substantially circular perforations on the other of said first member and said second member.

11. The corpectomy device of claim 6, wherein:

a) at least one of said first member and said second member include an aperture providing access to said chamber for packing said chamber with material encouraging the growth of bone, blood vessels and other tissue.

12. The corpectomy device of claim 6, wherein:

a) said second member and said first member have outer axial ends with outwardly extending flanges including teeth on a surface thereof for engaging bone.

13. The corpectomy device of claim 6, wherein said second member comprises an inner tubular member and said first member comprises an outer tubular member having a passage for engaging said inner tubular member, said inner tubular member being telescopingly disposed within said outer tubular member.

14. The corpectomy device of claim 13, wherein said inner tubular member has an outer surface including first surface portions and second surface portions.

15. The corpectomy device of claim 1 wherein said first member comprises a hollow, outer tubular member having a longitudinal axis and a passage,

said second member comprises an inner tubular member moveable in an axial direction with respect to said first member, said second member defining a chamber with said first member and being slidably and telescopingly received in said passage of said first member for movement in said axial direction;

and said outer tubular member including a wall having an inner surface defining said passage and an outer surface, said outer surface defining a circular cross-sectional shape.

16. A corpectomy device, comprising:

a) a first member comprising a hollow member having a longitudinal axis, a polygonal passage, and an outer axial end with an outwardly extending flange including teeth on a surface thereof for engaging bone;

b) a second member moveable in an axial direction with respect to said first member and having a polygonal cross-section and an outer axial end with an outwardly extending flange including teeth on a surface thereof for engaging bone, said second member defining a chamber with said first member and being slidably and telescopingly received in the polygonal passageway of said first member for movement in said axial direction; and

c) a locking clip engagable with said first member and said second member and moveable between a first unlocked position and a second locked position for locking said first member and said second member in a relative axial position with respect to one another;

said flanges being disposed at an acute angle with respect to said longitudinal axis.

17. A corpectomy device, comprising:

a) an inner member having a polygonal shape including corners;

b) an outer member having a polygonal passage sized and shaped so that said inner member is telescopingly and nonrotatably received in said outer member so that said inner member and said outer member have a longitudinal axis;

c) a movable locking clip having an inner surface defining an aperture including corners and locking portions, said locking clip being rotatably mounted on said outer member so that said locking clip is limited in axial movement on said outer member; and

d) mating surfaces on said locking portions of said locking clip and said corners of said inner member for interengagement to prevent axial movement between said locking clip and said inner member.

18. The corpectomy device of claim 17, wherein said mating surfaces comprise threads on said locking portions and said corners of said inner member.

19. The corpectomy device of claim 17, wherein said outer member includes a slot and said locking clip includes a pin mounted on said locking clip and extending through said slot for limiting the axial movement of said locking clip.

20. The corpectomy device of claim 19, wherein said pin extends through said slot to limit the rotational movement of said locking clip.

21. The corpectomy device of claim 17, wherein said outer member includes a hole and said locking clip includes a corresponding hole, said hole on said outer member and said hole on said locking clip being engagable with a set screw for fixing the relative position of said locking clip and said outer cylinder with respect to each other.

22. The corpectomy device of claim 17, wherein:

a) said inner member includes a radially extending first flange on an outer axial end of said inner member, said first flange including teeth on a surface of said first flange for engaging bone; and

b) said outer member includes a radially extending second flange on an outer axial end of said outer member, said second flange including teeth on a surface of said second flange for engaging bone.

23. The corpectomy device of claim 22, wherein said first flange and said second flange are disposed at an acute angle with respect to said longitudinal axis.