US4778469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming tissue ingrowth surface on surgical implants
Assignee: Howmedica Osteonics Corp
•
Filing: 1986-11-04
•
Granted: 1988-10-18
•
Expires: 2006-11-04
Abstract
Abstract A method of producing a site for tissue ingrowth on a surgical implant (20) by embedding a space occupier (10) possessing a desired pattern (14) in the surface (24) of the implant (20) at the desired location (22) for ingrowth and then solubilizing the embedded space occupier (10) to leave the pattern (14) on the implant surface (24). Preferably, the implant (20) is fabricated from a composite comprising a semi-crystalline thermoplastic resin such as polyetheretherketone or polyphenylene sulfide, and the space occupier (10) is an acid-soluble metal plate machined to produce the desired pattern (14) and removed by aqueous acid solution.
Inventors
- 👤 Ruey Y. Lin
- 👤 Casper F. Stark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:12
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30771; B; B29; B29C; B29C33/00; B29C33/44; B29C33/52; B29C37/00; B29C37/0053; A61F2/3094; A61F2/30965; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30065; A61F2002/30084; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30795; A61F2002/30807; A61F2002/30808; A61F2002/3082; A61F2002/30823; A61F2002/30836; A61F2/30942; A61F2002/30957; A61F2210/00; A61F2210/0071; A61F2250/00; A61F2250/0014; A61F2250/0026; B29K; B29K2071/00; B29K2081/00; B29K2081/04; B29K2995/00; B29K2995/0037; B29K2995/0072; B29K2995/0074; Y; Y10; Y10S; Y10S623/00; Y10S623/915; Y10S623/919
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
A method of producing a site for tissue ingrowth on a surgical implant, which comprises the steps of: embedding a space occupier possessing a desired pattern for tissue ingrowth directly into the surface of the implant by pressing the space occupier directly into the implant surface at a selected portion of the implant where tissue growth is desired; and solubilizing the embedded space occupier with an agent non-reactive toward the implant to remove the space occupier and leave the desired pattern of sufficient depth in the implant surface to accept tissue ingrowth.
Claim 2
Independent Claim
92 words
A method of producing a site for tissue ingrowth on a surgical implant, which comprises the steps of: embedding a space occupier possessing a desired pattern for tissue ingrowth directly into the surface of the implant by pressing the space occupier directly into the implant surface at a selected portion of the implant where tissue growth is desired; and solubilizing the embedded space occupier with an agent non-reactive toward the implant to remove the space occupier and leave the desired pattern of sufficient depth in the implant surface to accept tissue ingrowth.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein the space occupier is in the form of an acid-soluble metal plate with a surface containing the desired pattern, and the solubilizing agent is an aqueous acid solution.
Claim 4
Dependent Claim
13 words
The method of claim 2 wherein the plate surface is a machined surface.
Claim 5
Dependent Claim
15 words
The method of claim 2 wherein the metal plate is fabricated from aluminum or zinc.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the space occupier is in the form of particulate water-soluble inorganic salt, and the solubilizing agent is water.
Claim 7
Dependent Claim
36 words
The method of claim 1 wherein the implant surface at the selected portion is fabricated of a material which penetrates into undercuts in the space occupier more readily than that of the bulk of the implant.
Claim 8
Dependent Claim
20 words
The method of claim 6 wherein the material is in the form of a sheet which fuses with the implant.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein the implant is fabricated from a composite comprising a thermoplastic resin.
Claim 10
Dependent Claim
11 words
The method of claim 8 wherein the thermoplastic resin is semi-crystalline.
Claim 11
Dependent Claim
15 words
The method of claim 9 wherein the thermoplastic resin is a polyetheretherketone or polyphenylene sulfide.
Claim 12
Dependent Claim
12 words
The method of claim 1 wherein the implant is a joint prosthesis.
Claim 13
Dependent Claim
13 words
The method of claim 11 wherein the joint prosthesis is a hip stem.
Claim 14
Dependent Claim
14 words
A surgical implant having tissue ingrowth surface produced by the method of claim 1.
References Cited (Backward Citations)
US4439391A
Cited
US4473421A
Cited
US4644942A
Cited
GB2142830A
Cited
US4613393A
Cited
US4657544A
Cited
US4656094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |