Spinal Cross-connector

• US 9,247,964 B1
• Filed: 03/01/2012
• Issued: 02/02/2016
• Est. Priority Date: 03/01/2011
• Status: Active Grant

• Current Assignee: Nuvasive Incorporated
• Original Assignee: Nuasive Incorporated
• Inventors: Shoshtaev, Eugene
• Primary Examiner(s): Robert, Eduardo C
• Assistant Examiner(s): ECKMAN, MICHELLE CHRISTINE
• Application Number:
  US13/410,218
• Time in Patent Office: 1,433 Days
• Field of Search: 606246-279
• US Class Current: 1/1
• CPC Class Codes: A61B 17/70 Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
• CPC Class Codes: A61B 17/7032 Screws or hooks with U-shaped head or back through which longitudinal rods pass
• CPC Class Codes: A61B 17/7038 to a different extent in different directions, e.g. within one plane only
• CPC Class Codes: A61B 17/7049 Connectors, not bearing on the vertebrae, for linking longitudinal elements together A61B17/7055, A61B17/7053, A61B17/7019 take precedence
• CPC Class Codes: A61B 17/7052 of variable angle or length
• CPC Class Codes: A61B 17/7055 connected to sacrum, pelvis or skull
• CPC Class Codes: A61B 17/7083 Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements
• CPC Class Codes: A61B 17/7091 for applying, tightening or removing longitudinal element-to-bone anchor locking elements, e.g. caps, set screws, nuts or wedges
• CPC Class Codes: A61B 2017/00477 Coupling A61B2017/0046 takes precedence
• CPC Class Codes: A61B 2017/00862 elastic or resilient for sutures A61B2017/0618
• CPC Class Codes: A61B 2017/564 Methods for bone or joint treatment
• CPC Class Codes: A61B 2017/7073 with intervertebral connecting element crossing an imaginary spinal median surface

Abstract

A spinal cross-connector comprises an elongated member, a first connector and a second connector. The first connector and the second connector are configured to receive spinal rods and adaptable to directly attach with pedicle screws. The first connector includes a first collet head, a first clamp and a first locking means. The second connector includes a second collet head, a second clamp and a second locking mans. The first locking means is configured to tighten over a first collet head and engage with the first connector. Similarly, the second locking means is configured to tighten over a second collet head and engage with the second connector. The engagement of the first locking means with the first connector and the second locking means with the second connector locks the spinal cross-connector.

Claims

1. A spinal cross-connector for providing stability and rigidity to a plurality of bilateral spinal rods, comprising:

an elongated member having a first end and a second end, said first end surrounded by a first ball spring collar having a shelled spherical shape with axial surface slits and said second end surrounded by a second ball spring collar having a shelled spherical shape with axial surface slits;

a first connector configured to directly attach with a first pedicle screw, said first connector includes a first collet head configured to receive a first tulip head of the first pedicle screw and accommodate a first spinal rod residing within the first tulip head, a first clamp having a first spherical pocket to receive said first ball spring collar of said elongated member and permits adjustment of said elongated member relative to said first clamp, a first locking member tightened over said first collet head configured to engage with said first connector for locking said first clamp with said first end of said elongated member and locking said first connector with said first tulip; and

a second connector configured to directly attach with a second pedicle screw, said second connector includes a second collet head configured to receive a second tulip head of the second pedicle screw and a plurality of cutouts to accommodate a second spinal rod residing within the second tulip head, a second clamp having a second spherical pocket to receive said second ball spring collar of said elongated member and permits adjustment of said elongated member relative to said second clamp, a second locking member tightened over said second collet head configured to engage with said second connector for locking said second clamp with said second end of said elongated member and second connector with said second tulip, said engagement of said first locking member and said second locking member with said first connector and said second connector respectively locks said spinal cross-connector.

2. The spinal cross-connector of claim 1, wherein said first ball spring collar and said second ball spring collar attached on said elongated member allows rotational adjustment to said first and second connectors in an axial plane, said rotational adjustment provides stability to said spinal cross-connector when said first tulip is positioned deeper than said second tulip on a vertebra.

3. The spinal cross-connector of claim 1, wherein said elongated member is configured to translate through said first ball spring collar and said second ball spring collar to adjust to the distance between said first spinal rod and said second spinal rod.

4. The spinal cross-connector of claim 1, wherein said first ball spring collar and said second ball spring collar are configured to rotate in said first spherical pocket and said second spherical pocket respectively to allow an axial adjustment.

5. The spinal cross-connector of claim 1, wherein said first collet head includes a recess to receive said first tulip and a plurality of cutouts to accommodate said first spinal rod.

6. The spinal cross-connector of claim 1, wherein said second collet head includes a recess to receive said second tulip and a plurality of cutouts to accommodate said second spinal rod.

7. The spinal cross-connector of claim 1, wherein said elongated member translates through said first and second spherical pockets through a conical passage.

8. The spinal cross-connector of claim 7, wherein said conical passage is larger than the diameter of said elongated member.

9. The spinal cross-connector of claim 1, wherein locking of said spinal crossconnector provides stability to said first spinal rod and said second spinal rod.

10. The spinal cross-connector of claim 1, wherein locking of said spinal crossconnector firmly secures said first spinal rod and said second spinal rod on the vertebrae.

11. A spinal implant for providing stability and rigidity to a plurality of bilateral spinal rods, comprising:

a plurality of bone anchoring elements each having a tulip and a pedicle screw; and

a spinal cross-connector, said spinal cross-connector comprising;

an elongated member having a first end and a second end, said first end surrounded by a first ball spring collar having a shelled spherical shape with axial surface slits and said second end surrounded by a second ball spring collar having a shelled spherical shape with axial surface slits;

a first connector configured to directly attach with a first pedicle screw, said first connector includes a first collet head configured to receive a first tulip of the first pedicle screw and accommodate a first spinal rod residing within said first tulip, a first clamp having a first spherical pocket to receive said first ball spring collar of said elongated member and permits adjustment of said elongated member relative to said first clamp, a first locking member tightened over said first collet head engages with said first connector for locking said first clamp with said first end of said elongated member and said first connector with said first tulip; and

a second connector configured to directly attach with a second pedicle screw, said second connector includes a second collet head configured to receive a second tulip of the second pedicle screw and a plurality of cutouts to accommodate a second spinal rod residing within the second tulip, a second clamp having a second spherical pocket to receive said second ball spring collar of said elongated member and permits adjustment of said elongated member relative to said second clamp, a second locking member tightened over said second collet head configured to engage with said second connector for locking said second clamp with said second end of said elongated member and second connector with said second tulip, said engagement of said first locking member and said with second locking member with said first connector and said second connector respectively locks said spinal cross-connector.

12. The spinal implant of claim 11, wherein said first ball spring collar and said second ball spring collar attached on said elongated member allows rotational adjustment to said first and second connectors in an axial plane, said rotational adjustment provides stability to said spinal cross-connector when said first tulip is positioned deeper than said second tulip on a vertebra.

13. The spinal implant of claim 11, wherein said elongated member is configured to translate through said first ball spring collar and said second ball spring collar to adjust to the distance between said first spinal rod and said second spinal rod.

14. The spinal implant of claim 11, wherein said first ball spring collar and said second ball spring collar are configured to rotate in said first spherical pocket and said second spherical pocket respectively to allow an axial adjustment.

15. The spinal implant of claim of claim 11, wherein said first collet head includes a recess to receive said first tulip and a plurality of cutouts to accommodate said first spinal rod.

16. The spinal implant of claim of claim 11, wherein said second collet head includes a recess to receive said second tulip and a plurality of cutouts to accommodate said second spinal rod.

17. The spinal implant of claim 11, wherein said elongated member translates through said first and second spherical pockets through a conical passage.

18. The spinal implant of claim 17, wherein said conical passage is larger than the diameter of said elongated member.

19. The spinal implant of claim 11, wherein locking of said spinal cross-connector provides stability to said first spinal rod and said second spinal rod.

20. The spinal implant of claim 11, wherein locking of said spinal cross-connector firmly secures said first spinal rod and said second spinal rod on the vertebrae.