Bone screw

Patent 5180382 Issued on January 19, 1993. Estimated Expiration Date:

December 17, 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

2382019

3915162

Bone screw
Patent #: 4175555
Issued on: 11/27/1979
Inventor: Herbert

External compression bone fixation device
Patent #: 4456005
Issued on: 06/26/1984
Inventor: Lichty

Compression bone screw
Patent #: 4463753
Issued on: 08/07/1984
Inventor: Gustilo

Helical mandibular implant
Patent #: 4468200
Issued on: 08/28/1984
Inventor: Munch

Cannulated fixation screw
Patent #: 4537185
Issued on: 08/27/1985
Inventor: Stednitz

Bone screw
Patent #: 4640271
Issued on: 02/03/1987
Inventor: Lower

Bone screw and method
Patent #: 4723541
Issued on: 02/09/1988
Inventor: Reese

Variable length fixation device
Patent #: 4940467
Issued on: 07/10/1990
Inventor: Tronzo

More ...

Inventors

Application

No. 808594 filed on 12/17/1991

US Classes:

606/65, Femoral screw606/72, Orthopedic fastener606/73Threaded fastener element

Examiners

Primary: Brown, Michael A.

Attorney, Agent or Firm

Davis Hoxie Faithfull & Hapgood

International Class

A61B 017/56

Foreign Application Priority Data

1990-12-19 DE

Abstract

A bone screw (1) has a screw head (2), a screw tip (11), and a shaft (5) with a thread (8,14). The threaded segment (6,7) of the shaft (5) has a head-end, essentially cylindrical first shaft section (6) with minor diameter d1 (16), and a tip-end second shaft segment (7) that is connected with the first shaft segment (6) and which has a smaller minor diameter d2 (17). The thread (8,14) in the two shaft segments (6,7) has the same pitch (10,12).