Device for the adjustable fixing of spinal osteosynthesis rods

Patent 5176680 Issued on January 5, 1993. Estimated Expiration Date:

February 8, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

External fixation device
Patent #: 4483334
Issued on: 11/20/1984
Inventor: Murray

Apparatus for external fixation of bone fractures
Patent #: 4502473
Issued on: 03/05/1985
Inventor: Harris , et al.

Open backed pedicle screw
Patent #: 4887596
Issued on: 12/19/1989
Inventor: Sherman

Pedicle screw
Patent #: 4946458
Issued on: 08/07/1990
Inventor: Harms, et al.

Clamp and system for internal fixation
Patent #: 5047029
Issued on: 09/10/1991
Inventor: Aebi, et al.

Vertebral implant for osteosynthesis device Patent #: 5067955
Issued on: 11/26/1991
Inventor: Cotrel

Inventors

Application

No. 652101 filed on 02/08/1991

US Classes:

606/61, Spinal positioner or stabilizer606/60, Internal fixation means606/73Threaded fastener element

Examiners

Primary: Apley, Richard J.
Assistant: Dvorak, Linda C. M.

Attorney, Agent or Firm

Roylance, Abrams, Berdo & Goodman

Foreign Patent References

0408489 EP 01/13/1991
3722590 DD 12/13/1988
9101691 WO 02/13/1991

International Class

A61F 002/00

Foreign Application Priority Data

1990-02-08 FR

Abstract

The present invention concerns a device for fixing osteosynthesis rods to pedicular screws (1), the device being of the type including a diapason-shaped head (4) defining two branches (4a, 4b) collectively receiving a rod (6) to be fixed, the head being locked in its housing (5) by a locking screw (7), wherein it further includes, threaded on the rod (6) and inserted between the locking screw (7) and the bottom of the housing (5), a split ring (9) whose opposing external faces (10) directed towards the locking screw (7) and said bottom are convex and received in complementary concave surfaces (11, 12) provided on the extremity of the locking screw (7) and the bottom of the receiving housing (5) of the rod (6), the ring (9), prior to locking of the screw (7), allowing for a certain angular clearance of the rod (6) with respect to the axis of the screw (1).