Patent US5876457A successfully refreshed from Google Patents.
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 10:59
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.
References Cited (Backward Citations)
US4017571A
Cited
US4272855A
Cited
US4385405A
Cited
US4608052A
Cited
US4673409A
Cited
US4828563A
Cited
US4846834A
Cited
US4834757A
Cited
US4772287A
Cited
US4904260A
Cited
US4955907A
Cited
US4865603A
Cited
US5015247A
Cited
US5593409A
Cited
US5484437A
Cited
US5505732A
Cited
US5522899A
Cited
US4961740A
Cited
US4961740B1
Cited
US5026373A
Cited
US5062845A
Cited
US5015255A
Cited
US5445639A
Cited
US5489308A
Cited
US5458638A
Cited
US5306308A
Cited
US5055104A
Cited
US5059193A
Cited
US5236453A
Cited
US5158571A
Cited
US5306307A
Cited
US5180381A
Cited
US5207709A
Cited
US5263953A
Cited
US5306309A
Cited
US5545164A
Cited
US5496318A
Cited
US5489307A
Cited
US5330473A
Cited
US5683463A
Cited
US5514180A
Cited
US5658337A
Cited
USD377096S
Cited
USD377095S
Cited
US5545166A
Cited
US5702391A
Cited
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 |