Patent US5246530A successfully refreshed from Google Patents.
US5246530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing porous metal surface
Assignee: Trigon Inc
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Filing: 1992-02-28
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Granted: 1993-09-21
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Expires: 2012-02-28
Abstract
Abstract A porous surface is selectively formed on a workpiece such as a medical implant by pulsing a laser device in a controlled manner to produce a plurality of small, spaced-apart cavities of uniform or variable depth. The porous surface provides a mechanical grip with bone cement as well as a medium for bone and tissue ingrowth.
Inventors
- 👤 Clifford M. Bugle
- 👤 Alfred L. Donlevy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:44
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/08; B23K26/0823; A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30771; B23K26/36; B23K26/38; B23K26/382; B23K26/384; B23K26/389; B23K26/40; A61F2/3094; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2/38; A61F2/3859; A61F2/389; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30011; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30795; A61F2002/30803; A61F2002/30807; A61F2002/30808; A61F2002/30838; A61F2002/30925; A61F2002/3097; A61F2/34; A61F2002/3401; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2/46; A61F2002/4631; A61F2250/00; A61F2250/0014; A61F2250/0023; A61F2250/0026; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00029; A61F2310/00389; A61F2310/00592; A61F2310/00856; A61F2310/00862; B23K2101/00; B23K2101/34; B23K2101/35; B23K2103/00; B23K2103/08; B23K2103/14; B23K2103/18; B23K2103/26; B23K2103/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
61 words
A process for forming a porous surface on a metal implant device comprising the steps of: (a) providing a laser apparatus for generating a pulsed laser beam; (b) coating said metal implant device with a release agent; (c) activating said laser apparatus to form said porous surface; and (d) removing said release agent and accumulated metal platter from said implant device.
Claim 2
Dependent Claim
61 words
A process for forming a porous surface on a metal implant device comprising the steps of: (a) providing a laser apparatus for generating a pulsed laser beam; (b) coating said metal implant device with a release agent; (c) activating said laser apparatus to form said porous surface; and (d) removing said release agent and accumulated metal platter from said implant device.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein the release agent comprises a refractory material selected from the group consisting of yttria, alumina, boron nitride, magnesia, titanium oxide and graphite.
Claim 4
Dependent Claim
36 words
The process of claim 1 wherein the release agent comprises a slurry containing boron nitride which is applied to said implant device in a coating having a thickness of between about 0.002 to about 0.003 inch.
Claim 5
Dependent Claim
82 words
A process for forming a porous surface on a metal implant device comprising the steps of: (a) providing a laser apparatus for generating a laser beam; (b) coating said metal implant device with a chemical maskant; (c) drilling a plurality of cavities in the metal implant device with said laser beam; (d) submerging said drilled device in an etching bath and etching said drilled cavities to selectively remove metal therefrom; and (e) cleaning said etched device to remove said chemical maskant therefrom.
Claim 6
Dependent Claim
82 words
A process for forming a porous surface on a metal implant device comprising the steps of: (a) providing a laser apparatus for generating a laser beam; (b) coating said metal implant device with a chemical maskant; (c) drilling a plurality of cavities in the metal implant device with said laser beam; (d) submerging said drilled device in an etching bath and etching said drilled cavities to selectively remove metal therefrom; and (e) cleaning said etched device to remove said chemical maskant therefrom.
Claim 7
Dependent Claim
22 words
The process of claim 4 wherein the etching step is one selected from the group consisting of chemical etching and electrolytic etching.
Claim 8
Dependent Claim
103 words
A process for forming a porous surface on a metal implant device comprising the steps of: (a) providing a laser apparatus for generating a pulsed laser beam; (b) coating said metal implant with a layer of a chemical maskant; (c) coating said layer of chemical maskant agent with a release agent; (d) pulsing said laser to drill a plurality of cavities in said coated metal implant device; (e) submerging said drilled and coated implant device in an etching bath and etching said drilled cavities to selectively remove metal therefrom; and (f) cleaning said etched implant device to remove said chemical maskant coating therefrom.
Claim 9
Dependent Claim
103 words
A process for forming a porous surface on a metal implant device comprising the steps of: (a) providing a laser apparatus for generating a pulsed laser beam; (b) coating said metal implant with a layer of a chemical maskant; (c) coating said layer of chemical maskant agent with a release agent; (d) pulsing said laser to drill a plurality of cavities in said coated metal implant device; (e) submerging said drilled and coated implant device in an etching bath and etching said drilled cavities to selectively remove metal therefrom; and (f) cleaning said etched implant device to remove said chemical maskant coating therefrom.
Claim 10
Dependent Claim
22 words
The process of claim 6 wherein the etching step is one selected from the group consisting of chemical etching and electrolytic etching.
Claim 11
Dependent Claim
24 words
The process of claim 6 including the step of applying a coating of bone growth stimulant to said porous surface after said cleaning step.
Claim 12
Dependent Claim
20 words
The process of claim 8 wherein said bone growth stimulant comprises a plasma sprayed coating of hydroxylapatite and tricalcium phosphate.
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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) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |