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US5236457A
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Method of making an implant having a metallic porous surface
Assignee: Zimmer Technology Inc
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Filing: 1992-02-27
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Granted: 1993-08-17
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Expires: 2012-02-27
Abstract
Abstract An implant comprises a plastic body and a metallic, porous surface securely fixed to the body. The implant is made by first producing a porous mold insert having a porous metal structure and a soluble filler material filling a portion of its pores. The mold insert is then placed in a mold and plastic is injected into the mold and the exposed pores of the insert to form the implant body and securely attach the body and insert. The implant is then contacted by a solvent which dissolves the filler material to expose that portion of the insert which had been filled.
Inventors
- 👤 Thirumal Devanathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:28
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/68; B29C70/681; B29C70/683; A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30907; A61L; A61L27/00; A61L27/28; A61L27/30; A61L27/306; B29C45/00; B29C45/14; B29C45/14311; B29C45/14778; B29C45/14795; B29C70/74; B29C70/745; A61F2/3094; A61F2/32; A61F2/36; A61F2/3662; A61F2/3676; A61F2/30942; A61F2002/30957; A61F2002/30975; A61F2/3609; A61F2002/3625; B29C2045/14803; B29L; B29L2031/00; B29L2031/753; B29L2031/7532; Y; Y10; Y10S; Y10S623/00; Y10S623/901; Y10S623/92; Y10S623/923
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
56 words
A method for producing an implant having a body and a porous surface, comprising the steps of: forming a porous insert by introducing an amorphous polymer into some of the pores of a porous material; positioning the porous insert in a mold; injecting a semi-crystalline polymer into the mold; dissolving the amorphous polymer in a solvent.
Claim 2
Independent Claim
56 words
A method for producing an implant having a body and a porous surface, comprising the steps of: forming a porous insert by introducing an amorphous polymer into some of the pores of a porous material; positioning the porous insert in a mold; injecting a semi-crystalline polymer into the mold; dissolving the amorphous polymer in a solvent.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the amorphous polymer is selected from the group consisting of polysulfone, polyethersulfone, polycarbonate, and polymethylmethacrylate.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein the semi-crystalline polymer is selected from the group consisting of polyetheretherketone, polyaryletherketone, and polyphenylinesulfide.
Claim 5
Dependent Claim
22 words
the method of claim 1 wherein the solvent is selected from the group consisting of methylene chloride, methyl ethyl ketone, and acetone.
Claim 6
Dependent Claim
21 words
The method of claim 1 wherein the porous material is heated while the filler material is pressed into the porous material.
Claim 7
Independent Claim
71 words
A method for producing an implant comprising the steps of: filling partially some of the pores of a porous material with a filler material to form an insert; molding a body adjacent the insert so that the body material interdigitates with some of the pores not filled by the filler material; and exposing some of the pores in the porous material by removal of filler material after the body is molded.
Claim 8
Independent Claim
71 words
A method for producing an implant comprising the steps of: filling partially some of the pores of a porous material with a filler material to form an insert; molding a body adjacent the insert so that the body material interdigitates with some of the pores not filled by the filler material; and exposing some of the pores in the porous material by removal of filler material after the body is molded.
Claim 9
Independent Claim
64 words
A method of producing an implant having a body, the method comprising the steps of: providing a porous material; introducing a filler material into some of the pores of the porous material; and forming at least a portion of the body of the implant adjacent the porous material so that the portion interdigitates with some of the pores not filled by the filler material.
Claim 10
Independent Claim
64 words
A method of producing an implant having a body, the method comprising the steps of: providing a porous material; introducing a filler material into some of the pores of the porous material; and forming at least a portion of the body of the implant adjacent the porous material so that the portion interdigitates with some of the pores not filled by the filler material.
Claim 11
Dependent Claim
32 words
The method of claim 7 further comprising the step of exposing some of the pores in the porous material by removal of some of the filler material after the body is formed.
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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) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |