US5360448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous-coated bone screw for securing prosthesis
Assignee: Individual
•
Filing: 1993-01-19
•
Granted: 1994-11-01
•
Expires: 2013-01-19
Abstract
Abstract Bone screws are disclosed with and without heads and with the screw shaft provided with axially adjacent longitudinally extending regions, one or more of which have bone ingrowth porous surfaces and alternate with regions having threaded surfaces. The headed embodiments have a region with a threaded surface nearest the head.
Inventors
- 👤 Jeffrey J. Thramann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:20
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/08; A61F2/0811; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8625; A61B17/863; A61B17/866; A61L; A61L31/00; A61L31/02; A61L31/022; A61L31/08; A61L31/082; A61L31/088; A61L31/14; A61L31/146; A61F2/30; A61F2/32; A61F2/36; A61F2002/0847; A61F2002/0858; A61F2002/087; A61F2002/0876; A61F2002/0888; A61F2/34; A61F2002/3401; A61F2002/3429; A61F2250/00; A61F2250/0014; A61F2250/0051; Y; Y10; Y10S; Y10S411/00; Y10S411/90; Y10S606/00; Y10S606/907; Y10S606/908
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A bone screw comprising: a shaft of circular cross section having a driving end provided with a tool engaging means, and an opposite leading end; said shaft from said driving end to said leading end being divided into a plurality of adjacent coaxially aligned longitudinal regions, at least two of said regions that are not contiguous having an external bone ingrowth porous circumferentially continuous surface free from threads along their respective lengths, and at least one of said regions located between said two porous surface regions having an externally threaded non-porous surface throughout its length.
Claim 2
Dependent Claim
95 words
A bone screw comprising: a shaft of circular cross section having a driving end provided with a tool engaging means, and an opposite leading end; said shaft from said driving end to said leading end being divided into a plurality of adjacent coaxially aligned longitudinal regions, at least two of said regions that are not contiguous having an external bone ingrowth porous circumferentially continuous surface free from threads along their respective lengths, and at least one of said regions located between said two porous surface regions having an externally threaded non-porous surface throughout its length.
Claim 3
Dependent Claim
53 words
A bone screw as claimed in claim 1, having a circular head portion integral with said driving end of said shaft, said head portion having a larger diameter than the outer diameter of said region on said shaft closest to said head portion, and wherein said head portion includes said tool engaging means.
Claim 4
Dependent Claim
57 words
A bone screw as claimed in claim 1, wherein said two porous surface regions have different diameters with the region of larger diameter being located nearer said driving end of the shaft than the region of smaller diameter, and said region with a threaded surface has a smaller crest diameter than said larger diameter porous surface region.
Claim 5
Dependent Claim
35 words
A bone screw as claimed in claim 1, wherein said porous surface region that is nearer said leading end of said shaft has a smaller diameter than the crest diameter of said threaded surface region.
Claim 6
Dependent Claim
13 words
A bone screw as claimed in claim 1, composed of a biocompatible material.
Claim 7
Dependent Claim
27 words
A bone screw as claimed in claim 1, composed of a material selected from the group consisting of stainless steel, cobalt-chromium, titanium, alloys thereof, and composite materials.
Claim 8
Dependent Claim
32 words
A bone screw as claimed in claim 1, wherein said bone ingrowth porous surface is provided by a material selected from the group consisting of spherical powders, fiber structures, and plasma-sprayed coatings.
References Cited (Backward Citations)
US471179A
Cited
GB840759A
Cited
DE1961531A1
Cited
US3852045A
Cited
US3905777A
Cited
DE2628443A1
Cited
US4052754A
Cited
US4177524A
Cited
US4259072A
Cited
US4599085A
Cited
EP0176711A1
Cited
US5084050A
Cited
US4632100A
Cited
US4883491A
Cited
FR2610512A1
Cited
GB2220571A
Cited
US5019079A
Cited
US5152795A
Cited
EP0475358A1
Cited
US5098434A
Cited
US5094618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-31 | 1998-05-02 | 1998-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-31 | 2002-05-02 | 2002-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-31 | 2006-05-02 | 2006-11-01 | $7700.00 | Window Closed / Lapsed |