US5405389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered coatings for implantable prostheses
Assignee: Joint Medical Products Corp
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Filing: 1993-02-18
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Granted: 1995-04-11
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Expires: 2013-02-18
Abstract
Abstract A sintered coating (13) for an implantable prosthesis (10) is provided having 1) interstices into which tissue or bone can grow, and 2) increased surface roughness which provides enhanced initial press-fit fixation. In certain embodiments, the coating includes at least two sets of particles (46,48) having different mean diameters. The sizes and numbers of particles are chosen so as to produce a matrix of smaller particles (48) in which are embedded a lesser number of spaced-apart larger particles (46). The smaller particles (48) provide support for the larger particles (46), and the larger particles (46) stand proud of the smaller particles (48) to provide the enhanced surface roughness. In other embodiments, the coating includes both generally smaller spherically-shaped (SS) particles and generally larger non-spherically-shaped (NSS) particles, with the NSS particles providing enhanced surface roughness and the SS particles providing support for the NSS particles.
Inventors
- 👤 Robert L. Conta
- 👤 Alfred F. DeCarlo, Jr.
- 👤 Douglas G. Noiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:28
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/40; A61L27/42; A61L27/427; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61L27/02; A61L27/04; F; F16; F16B; F16B2/00; F16B2/005; A61F2/32; A61F2/34; A61F2002/30001; A61F2002/30108; A61F2002/30199; A61F2002/30242; A61F2002/30316; A61F2002/30317; A61F2002/30327; A61F2002/30769; A61F2/30771; A61F2002/30904; A61F2002/30929; A61F2/3094; A61F2002/30968; A61F2230/00; A61F2230/0063; A61F2230/0071; A61F2250/00; A61F2250/0014; A61F2250/0039; Y; Y10; Y10S; Y10S623/00; Y10S623/92
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A prosthesis for implantation in a body having an outer surface at least a portion of which has a sintered coating comprising a random mixture of at least two sets of metallic particles one of said at least two sets being composed of spherically-shaped particles and another of said at least two sets being composed of non-spherically-shaped particles, wherein: (a) the coating comprises less than two complete layers of particles; (b) there are sintered junctions between the spherically-shaped particles and the non-spherically-shape particles; and (c) the set composed of spherically-shaped particles has a smaller mean diameter than the mean diameter of the set composed of non-spherically-shaped particles.
Claim 2
Dependent Claim
107 words
A prosthesis for implantation in a body having an outer surface at least a portion of which has a sintered coating comprising a random mixture of at least two sets of metallic particles one of said at least two sets being composed of spherically-shaped particles and another of said at least two sets being composed of non-spherically-shaped particles, wherein: (a) the coating comprises less than two complete layers of particles; (b) there are sintered junctions between the spherically-shaped particles and the non-spherically-shape particles; and (c) the set composed of spherically-shaped particles has a smaller mean diameter than the mean diameter of the set composed of non-spherically-shaped particles.
Claim 3
Dependent Claim
19 words
The prosthesis of claim 1 wherein the portion of the outer surface which has the sintered coating is stepped.
Claim 4
Dependent Claim
15 words
The prosthesis of claim 1 wherein the coating comprises substantially a single layer of particles.
Claim 5
Dependent Claim
34 words
The prosthesis of claim 1 wherein the at least two sets of metallic particles have a size distribution which is at least bimodal such that the size distribution includes at least two discernible peaks.
Claim 6
Dependent Claim
43 words
The prosthesis of claim 4 wherein the diameters of the spherically-shaped particles are in the range from about 210 microns to about 250 microns and the diameters of the non-spherically-shaped particles are in the range from about 250 microns to about 600 microns.
Claim 7
Dependent Claim
27 words
The prosthesis of claim 1 wherein the ratio of the number of spherically-shaped particles to the number of non-spherically-shaped particles is between about 1:1 and about 20:1.
Claim 8
Dependent Claim
23 words
The prosthesis of claim 1 wherein the ratio of the number of spherically-shaped particles to the number of non-spherically-shaped particles is approximately 1:1.
Claim 9
Dependent Claim
38 words
The prosthesis of claim 1 wherein the coating is formed using a mixture of a volume of spherically-shaped particles and a volume of non-spherically-shaped particles, the volume of non-spherically-shaped particles being greater than the volume of spherically-shaped particles.
Claim 10
Dependent Claim
23 words
The prosthesis of claim 8 wherein the ratio of the volume of non-spherically-shaped particles to the volume of spherically-shaped particles is approximately 70:30.
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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) | 1998-04-10 | 1998-10-10 | 1999-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-10 | 2002-10-10 | 2003-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-10 | 2006-10-10 | 2007-04-11 | $7700.00 | Window Closed / Lapsed |