US5258030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous coated implants
Assignee: TRUSTEES OF UNIVERSITY OF PENNSYLVANIA A NON-PROFIT Corp OF
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Filing: 1991-07-08
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Granted: 1993-11-02
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Expires: 2011-07-08
Abstract
Abstract Orthopaedic implants exhibiting improved fatigue strength are disclosed. By forming a plurality of nodules on the surface of an implant and depositing a porous coating onto the surface of these nodules, the fatigue strength of implants such as those made from α+β titanium alloys, e.g., Ti-6Al-4V alloy is substantially improved. The present invention provides a novel geometry which substantially reduces the stress concentration factor created by the interfacial geometry of conventional porous coatings. Methods of manufacturing porous coated orthopaedic implants are also disclosed.
Inventors
- 👤 Debra Wolfarth
- 👤 Paul Ducheyne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:57
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30771; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2002/30001; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30769; A61F2250/00; A61F2250/0014; A61F2250/0026; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; Y; Y10; Y10S; Y10S623/00; Y10S623/92; Y10S623/923; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982; Y10T428/00; Y10T428/12; Y10T428/12479
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
85 words
An orthopaedic implant for promoting bone ingrowth having improved fatigue strength comprising: an implant substrate having at least one nodule formed thereon that extends upwardly from the substrate to define a distal surface; and a porous coating affixed only to the distal surface, wherein a radius (r) is defined between the substrate and the distal surface, and a contact area (CA) is defined between the nodule and the substrate, whereby the ratio between the radius and the contact area (r/CA) is greater than about 0.080.
Claim 2
Dependent Claim
85 words
An orthopaedic implant for promoting bone ingrowth having improved fatigue strength comprising: an implant substrate having at least one nodule formed thereon that extends upwardly from the substrate to define a distal surface; and a porous coating affixed only to the distal surface, wherein a radius (r) is defined between the substrate and the distal surface, and a contact area (CA) is defined between the nodule and the substrate, whereby the ratio between the radius and the contact area (r/CA) is greater than about 0.080.
Claim 3
Dependent Claim
34 words
The orthopedic implant of claim 1, further comprising a plurality of nodules wherein the nodules are comprised of a series of parallel ridges formed between a series of troughs that define a bottom surface.
Claim 4
Dependent Claim
53 words
The orthopaedic implant of claim 2 wherein the height of the ridges is greater than about 1.0 mm (0.040 inches) above the bottom surface, wherein a radius connecting the distal surface and the bottom surface has a radius of about 2.5 mm (0.100 inches) and a width of about 6.25 mm (0.250) inches).
Claim 5
Dependent Claim
16 words
The orthopaedic implant of claim 1, wherein the substrate is comprised of an α+β titanium alloy.
Claim 6
Dependent Claim
14 words
The orthopaedic implant of claim 1, wherein the substrate is comprised of Ti-6Al-4V alloy.
Claim 7
Dependent Claim
17 words
The orthopaedic implant of claim 1, wherein the porous coating is comprised of a plurality of particles.
Claim 8
Dependent Claim
18 words
The orthopaedic implant of claim 1, wherein the porous coating is comprised of a plurality of spherical beads.
Claim 9
Dependent Claim
46 words
The orthopaedic implant of claim 1, further comprising a plurality of nodules wherein the porous coating is comprised of a plurality of wires that extend discontinuously between nodules and do not form a bridge between the distal surfaces of a first nodule and a second nodule.
Claim 10
Dependent Claim
46 words
The orthopaedic implant of claim 1, further comprising a plurality of nodules wherein the porous coating is comprised of a plurality of fibers that extend discontinuously between nodules and do not form a bridge between the distal surfaces of a first nodule and a second nodule.
Claim 11
Dependent Claim
36 words
The orthopaedic implant of claim 1, wherein a ratio (r/CA) is defined between a (r) between the distal surface and the substrate and a contact area (CA) between the nodule and the substrate is about 0.4.
Claim 12
Dependent Claim
89 words
An orthopaedic implant for promoting bone ingrowth having improved fatigue strength comprising: an implant substrate having at least one ridge formed between two troughs defining a nodule that extends upwardly from the substrate, the troughs defining a bottom surface, and the nodule having a distal surface, wherein the distal surface extends upwardly to a height that is greater than about 1.0 mm (0.040 inches) above the bottom surface, the nodule having a width of about 6.25 mm (0.250 inches); and a porous coating affixed only to the distal surface.
Claim 13
Dependent Claim
89 words
An orthopaedic implant for promoting bone ingrowth having improved fatigue strength comprising: an implant substrate having at least one ridge formed between two troughs defining a nodule that extends upwardly from the substrate, the troughs defining a bottom surface, and the nodule having a distal surface, wherein the distal surface extends upwardly to a height that is greater than about 1.0 mm (0.040 inches) above the bottom surface, the nodule having a width of about 6.25 mm (0.250 inches); and a porous coating affixed only to the distal surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-01 | 1997-05-03 | 1997-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-01 | 2001-05-03 | 2001-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-01 | 2005-05-03 | 2005-11-02 | $7700.00 | Window Closed / Lapsed |