US5876457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinal implant
Assignee: Individual
•
Filing: 1997-05-20
•
Granted: 1999-03-02
•
Expires: 2017-05-20
Abstract
Abstract A spinal implant including a hollow, generally tubular shell having an exterior lateral surface, a leading end, and a trailing end. The shell has a helical thread projecting from its exterior surface. The thread includes a plurality of pillars. Each pillar has a height of 100-4500 microns and a lateral dimension at the widest point of 100-4500 microns. The exterior surface has a plurality of holes therethrough to permit bone growth therethrough. The spinal implant may alternatively have a plurality of pillars projecting from its exterior surface in a regular, non-helical array.
Inventors
- 👤 George J. Picha
- 👤 Jeffrey A. Goldstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:17
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61F2/4455; A61F2/446; A61F2/30767; A61F2/30771; A61F2/442; A61F2/28; A61F2002/2817; A61F2002/2835; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30125; A61F2002/30126; A61F2002/30138; A61F2002/30153; A61F2002/30154; A61F2002/30199; A61F2002/30224; A61F2002/30228; A61F2002/30235; A61F2002/30316; A61F2002/30535; A61F2002/30593; A61F2002/30772; A61F2002/30784; A61F2002/30787; A61F2002/3085; A61F2002/30858; A61F2002/30868; A61F2002/30869; A61F2002/30871; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0008; A61F2230/0017; A61F2230/0019; A61F2230/0021; A61F2230/0063; A61F2230/0069; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00389; A61F2310/00592; A61F2310/00796; Y; Y10; Y10S; Y10S606/00; Y10S606/907; Y10S606/909
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A spinal implant comprising a hollow, generally tubular shell having an exterior surface, a first end, and a second end, said shell having a helical thread projecting from said exterior surface, said thread comprising a plurality of pillars, each pillar having a height of between about 100-4500 microns and a dimension in a direction perpendicular to the height of between about 100-4500 microns, so as to facilitate bone ingrowth and mechanical anchoring of said spinal implant and to discourage formation of a fibrous capsule around said spinal implant, said exterior surface having a plurality of holes therethrough to permit bone growth therethrough.
Claim 2
Dependent Claim
102 words
A spinal implant comprising a hollow, generally tubular shell having an exterior surface, a first end, and a second end, said shell having a helical thread projecting from said exterior surface, said thread comprising a plurality of pillars, each pillar having a height of between about 100-4500 microns and a dimension in a direction perpendicular to the height of between about 100-4500 microns, so as to facilitate bone ingrowth and mechanical anchoring of said spinal implant and to discourage formation of a fibrous capsule around said spinal implant, said exterior surface having a plurality of holes therethrough to permit bone growth therethrough.
Claim 3
Dependent Claim
25 words
A spinal implant according to claim 1, a plurality of said pillars having a side surface which is undercut at an undercut angle of 5°-30°.
Claim 4
Dependent Claim
43 words
A spinal implant according to claim 1, said thread comprising a plurality of pairs of pillars, each pair of pillars being two pillars which are side-by-side, each pair defining a line which is laterally oriented with respect to the direction of the thread.
Claim 5
Dependent Claim
14 words
A spinal implant according to claim 1, each pillar being substantially without sharp edges.
Claim 6
Dependent Claim
25 words
A spinal implant according to claim 1, said helical thread defining a helical valley between said turns, a plurality of pillars projecting from said valley.
Claim 7
Dependent Claim
28 words
A spinal implant according to claim 1, a hole through said shell being provided between a pair of said pillars which are adjacent one another in said thread.
Claim 8
Dependent Claim
31 words
A spinal implant according to claim 1, said helical thread defining a helical valley between turns of said thread, a plurality of holes being provided in said valley through said shell.
Claim 9
Dependent Claim
15 words
A spinal implant according to claim 1, said implant being coated with bone inductive agent.
Claim 10
Dependent Claim
17 words
A spinal implant according to claim 1, wherein each of said pillars has an outer planar surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-01 | 2002-08-31 | 2003-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-01 | 2006-08-31 | 2007-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-01 | 2010-08-31 | 2011-03-02 | $7700.00 | Window Closed / Lapsed |