Bone screw

Patent 5443467 Issued on August 22, 1995. Estimated Expiration Date:

February 18, 2014. 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 fracture immobilization splint
Patent #: 4299212
Issued on: 11/10/1981
Inventor: Goudfrooy

Device for the adjustable fixing of spinal osteosynthesis rods
Patent #: 5176680
Issued on: 01/05/1993
Inventor: Vignaud, et al.

5190543

Implant for an osteosynthesis device, in particular for spinal column correction
Patent #: 5261912
Issued on: 11/16/1993
Inventor: Frigg

Lumbar spine fixation apparatus and method Patent #: 5306275
Issued on: 04/26/1994
Inventor: Bryan

Inventors

Application

No. 198949 filed on 02/18/1994

US Classes:

606/65, Femoral screw606/54, External fixation means606/72, Orthopedic fastener606/73Threaded fastener element

Examiners

Primary: Aschenbrenner, Peter A.

Attorney, Agent or Firm

Brown; Donald

Foreign Patent References

0443892A1 EP. 08/13/1991
0465158A2 EP. 01/13/1992
3923966A1 DE. 02/13/1991
WO01115 WO 02/13/1991

International Class

A61F 005/04

Abstract

A bone screw comprises a receiver member (5) and a screw member (1) having a threaded portion (2) and a head (3) having a spherical segment-shaped portion. The receiver member (5) comprises an internal thread (10) for allowing a relative adjustment of receiver member and screw member and the connection of the receiver member with a round rod. A pressure means (12) acts onto the head (3) and the rod (16) is placed on top of the pressure means. The arrangement is locked by means of a rod locking nut (13) and a lock nut (14) is screwed onto an external thread (11).