US5035713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical implants incorporating re-entrant material
Assignee: ORTHOPAEDIC RESEARCH INSTITUTE Inc A CORP OF KS
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Filing: 1990-02-12
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Granted: 1991-07-30
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Expires: 2010-02-12
Abstract
Abstract The use of re-entrant foam material as implants is disclosed. The re-entrant foam material may comprise the entire implant or other material may be used as a substrate with either a portion of the implant made of re-entrant material or a coating of re-entrant material may be applied or bonded to the substrate.
Inventors
- 👤 Elizabeth A. Friis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:26
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/16; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61L27/02; A61L27/04; A61L27/18; A61L27/50; A61L27/56; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2/3672; A61F2/3676; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30014; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30153; A61F2/30771; A61F2002/3082; A61F2/3609; A61F2002/3611; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2230/0019; A61F2250/00; A61F2250/0014; A61F2250/0018
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
135 words
An orthopaedic device to be surgically implanted in living tissue to become functionally attached to said tissue, said device comprising: a relatively rigid, load bearing body having a surface presenting a substrate; a layer of re-entrant structure on said substrate in disposition for ingrowth of said tissue into the re-entrant structure for attaching the layer to the tissue, said re-entrant structure comprising an open-cell material having a negative Poisson's ratio in at least one direction and under at least one mode of deformation and having a plurality of interconnected, spaced apart ribs defining a plurality of cells, the ribs being partially buckled and at least some of said buckled ribs protruding inwardly of the cells; and means fixedly securing the re-entrant structure layer to said substrate to effect attachment of the body to the tissue.
Claim 2
Dependent Claim
135 words
An orthopaedic device to be surgically implanted in living tissue to become functionally attached to said tissue, said device comprising: a relatively rigid, load bearing body having a surface presenting a substrate; a layer of re-entrant structure on said substrate in disposition for ingrowth of said tissue into the re-entrant structure for attaching the layer to the tissue, said re-entrant structure comprising an open-cell material having a negative Poisson's ratio in at least one direction and under at least one mode of deformation and having a plurality of interconnected, spaced apart ribs defining a plurality of cells, the ribs being partially buckled and at least some of said buckled ribs protruding inwardly of the cells; and means fixedly securing the re-entrant structure layer to said substrate to effect attachment of the body to the tissue.
Claim 3
Dependent Claim
24 words
A device as set forth in claim 1, wherein the average size of the cells of said re-entrant material is less than 100 microns.
Claim 4
Dependent Claim
28 words
A device as set forth in claim 1, wherein the average size of the cells of said re-entrant material range from about 150 microns to about 1000 microns.
Claim 5
Dependent Claim
34 words
A device as set forth in claim 1, wherein the re-entrant material is a transformed foam made of material selected from the group consisting of stainless steel, titanium alloys, elemental titanium and chromium-cobalt alloys.
Claim 6
Dependent Claim
34 words
A device as set forth in claim 1, wherein the re-entrant material is a transformed foam made of material selected from the group consisting of polyethylene, polyethylene teraphthalate, polypropylene, polysulfone, polylactic acid, and polydioxanome.
Claim 7
Dependent Claim
27 words
A device as set forth in claim 1, wherein the re-entrant material is a transformed foam made of polymer material which is biologically compatable with human tissue.
Claim 8
Dependent Claim
24 words
A device as set forth in claim 1, wherein the density of said re-entrant material is greater proximal said substrate than proximal said tissue.
Claim 9
Dependent Claim
21 words
A device as set forth in claim 1, wherein the re-entrant material is formed from the same material as the substrate.
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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) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |