End cap and connector for a spinal implant

• US 8,986,383 B2
• Filed: 08/30/2011
• Issued: 03/24/2015
• Est. Priority Date: 03/24/2005
• Status: Active Grant

• Current Assignee: K2M, Inc (Stryker Corporation)
• Original Assignee: Igip LLC
• Inventors: Castro, Frank
• Primary Examiner(s): Robert, Eduardo C
• Assistant Examiner(s): BRAY, STUART SAMUEL
• Application Number:
  US13/199,418
• Publication Number:
  US 20120004730A1
• Time in Patent Office: 1,302 Days
• Field of Search: 623 1711- 1716
• US Class Current: 623/17.11
• CPC Class Codes: A61F 2/30744 End caps, e.g. for closing an endoprosthetic cavity
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2002/30032 differing in absorbability or resorbability, i.e. in absorption or resorption time
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/30158 trapezoidal
• CPC Class Codes: A61F 2002/30261 parallelepipedal
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/30481 using a locking clip
• CPC Class Codes: A61F 2002/30578 having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2210/0004 bioabsorbable
• 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 2230/0026 trapezoidal
• CPC Class Codes: A61F 2230/0082 parallelepipedal
• CPC Class Codes: A61F 2250/003 differing in adsorbability or resorbability, i.e. in adsorption or resorption time
• 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

Abstract

The present invention is a spinal implant that can be inserted into a surgically created cavity of one or more regions of the mammalian spine. Among other things, the biocompatible implant and end cap or biocompatible implant, connector and end cap combinations can assist with the restoration of the normal anatomic spinal alignment and spinal stability.

Claims

1. A combination capable of insertion about a surgically created cavity proximate to one or more vertebrae;

said combination comprising;

a) a biocompatible cage comprising

a length having a longitudinal axis, a trapezoidal aperture spanning said length and two sides converging toward each other as said sides extend from anterior to posterior ends of said biocompatible cage said biocompatible cage; and

b) an end cap comprising;

i) a border comprising four sides;

ii) a plate extending in said lengthwise direction parallel said longitudinal axis away from said biocompatible cage and comprising at least one opening for receiving a fastener; and

iii) a pair of opposed generally flat docking slides docking with said trapezoidal aperture of said biocompatible cage.

2. The combination of claim 1 wherein:

a) said biocompatible cage further comprises a plurality of spikes extending outwardly from said first end perimeter in said lengthwise direction; and

b) said border of said end cap further comprises a first plurality of bores capable of aligning with some or all of said plurality of spikes.

3. The combination of claim 2 further comprising:

a connector, capable of receiving said docking slides and positioned between said biocompatible cage and said end cap;

said connector comprising;

a) a first leg comprising;

i) a plurality of apertures capable of aligning with some of said plurality of spikes; and

ii) a plurality of pins capable of aligning with some of said plurality of bores; and

b) a second leg comprising;

i) a plurality of apertures capable of aligning with some of said plurality of spikes; and

ii) a plurality of pins capable of aligning with some of said plurality of bores.

4. The combination of claim 3, wherein said connector comprises an anterior section joining a first end of said first leg and a first end of said second leg, wherein said anterior section shares a margin facing said biocompatible cage with said legs and includes an opposing margin extending further away from said biocompatible cage than said pluralities of pins, and wherein said anterior section is anterior to said plate.

5. A combination capable of insertion about a surgically created cavity proximate to one or more vertebrae;

said combination comprising;

a) a biocompatible cage comprising

a length having a longitudinal axis

and a trapezoidal aperture spanning said length; and

b) an end cap comprising;

i) a trapezoidal border; and

ii) a plate extending in said lengthwise direction parallel said longitudinal axis away from said biocompatible cage and comprising at least one opening for receiving a fastener; and

iii) opposed docking slides adapted to dock with said aperture of said biocompatible cage.

6. The combination of claim 5 wherein:

a) said biocompatible cage further comprises a plurality of spikes extending outwardly from said first end perimeter in said lengthwise direction; and

b) said border of said end cap further comprises a first plurality of bores aligning with some or all of said plurality of spikes.

7. The combination of claim 6 further comprising:

a connector, capable of receiving said docking slides and positioned between said biocompatible cage and said end cap;

said connector comprising;

a) a first leg comprising;

i) a plurality of apertures capable of aligning with some of said plurality of spikes; and

ii) a plurality of pins capable of aligning with some of said plurality of bores; and

b) a second leg comprising;

i) a plurality of apertures capable of aligning with some of said plurality of spikes; and

ii) a plurality of pins capable of aligning with some of said plurality of bores.

8. The combination of claim 7, wherein said connector comprises an anterior section joining a first end of said first leg and a first end of said second leg, wherein said anterior section shares a margin facing said biocompatible cage with said legs and includes an opposing margin extending further away from said biocompatible cage than said pluralities of pins, and wherein said anterior section is anterior to said plate.

9. An end cap for a biocompatible spinal implant;

said end cap comprising;

a) a border abutting a longitudinally positioned outermost brace of said biocompatible implant, wherein said outermost brace comprises an aperture;

b) a plate comprising at least one opening for receiving a fastener;

said plate positioned about an edge of said border and extending outward from said biocompatible spinal implant in a lengthwise direction parallel a longitudinal axis of said biocompatible implant; and

c) a pair of opposed generally flat docking slides adapted to slidably engage inward sides of said longitudinally positioned outermost brace;

wherein one of said pair of docking slides is wider than a second docking slide;

wherein surfaces of said docking slides are without configurations preventing sliding removal of said docking slides from said biocompatible spinal implant; and

wherein each said docking slide comprises a first surface engaging said outermost brace, a second corresponding surface opposite said first surface and a thickness between said first and said second surfaces.

10. The invention of claim 9, wherein an implant facing side of said border comprises a plurality of bores capable of engaging all or some spikes extending in said lengthwise direction from said brace.

11. The invention of claim 10, wherein said pair of opposed docking slides is configured to engage parallel inward sides of said longitudinally positioned outermost brace.

12. The invention of claim 10, wherein said pair of opposed docking slides is configured to engage converging inward sides of said longitudinally positioned outermost brace.

13. A combination capable of insertion about a surgically created cavity proximate to one or more vertebrae;

said combination comprising;

a) a biocompatible spinal implant comprising a longitudinally positioned outermost brace, wherein said outermost brace comprises a centralized aperture; and

b) an end cap comprising;

i) a border adapted to abut said longitudinally positioned outermost brace;

ii) a plate comprising at least one opening for receiving a fastener;

said plate positioned about an edge of said border and extending outward from said biocompatible spinal implant in a lengthwise direction parallel a longitudinal axis of said biocompatible implant; and

iii) a pair of opposed docking slides adapted to engage inward sides, defined by said centralized aperture, of said longitudinally positioned outermost brace;

wherein one of said pair of docking slides is wider than a second docking slide;

wherein surfaces of said docking slides are without configurations preventing sliding removal of said docking slides from said centralized aperture and only said fastener prevents sliding removal of said docking slides from said centralized aperture; and

wherein each said docking slide comprises a first planar surface engaging one of said inward sides and a thickness between a second surface and said first planar surface.

14. The combination of claim 13 further comprising a connector sandwiched between said end cap and said biocompatible spinal implant.

15. A combination capable of insertion about a surgically created cavity proximate to one or more vertebrae;

said combination comprising;

a) a spinal cage comprising a lengthwise end, wherein said lengthwise end comprises an aperture; and

b) an end cap comprising;

i) a border adapted to abut said lengthwise end of said spinal cage;

ii) a plate comprising at least one opening adapted to receive a screw;

said plate positioned about an edge of said border and extending outward from said spinal cage in a direction parallel a longitudinal axis of said spinal cage; and

iii) a pair of opposed docking slides adapted to slidably engage inward sides of said lengthwise end of said spinal cage;

wherein only said screw prevents unrestricted removal of said docking slides from said spinal cage, via said aperture; and

wherein each said docking slide comprises a first surface engaging one of said inward sides and a thickness between a second surface and said first planar surface.

16. The of claim 15 further comprising a connector sandwiched between said end cap and said spinal cage.

17. A combination capable of insertion about a surgically created cavity proximate to one or more vertebrae;

said combination comprising;

a) a spinal cage comprising a lengthwise end, wherein said lengthwise end comprises an aperture; and

b) an end cap comprising;

i) a border adapted to abut said lengthwise end of said spinal cage;

ii) a plate comprising at least one opening adapted to receive a fastener;

said plate positioned about an edge of said border and extending outward from said spinal cage in a direction parallel a longitudinal axis of said spinal cage; and

iii) a pair of opposed docking slides adapted to slidably engage, via said aperture, inward sides of said lengthwise end of said spinal cage;

wherein surfaces of said docking slides are without configurations preventing sliding removal of said docking slides from said aperture, and wherein each said docking slide comprises a first planar surface engaging one of said inward sides.

18. The end cap and spinal cage of claim 17 further comprising a connector sandwiched between said combination.