US5258034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Femoral prosthesis
Assignee: Individual
•
Filing: 1991-10-11
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Granted: 1993-11-02
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Expires: 2011-10-11
Abstract
Abstract The present invention provides a prosthesis having a stem and upper body part. The upper body part is coated in a material to promote the ingrowth of bone therein and the lower portion of the stem is coated by a material which will be absorbed during the time taken for the prosthesis to be held in place by ingrowth of bone onto the upper body part.
Inventors
- 👤 Ronald J. Furlong
- 👤 Johannes F. Osborn, deceased
- 👤 executor by Gerda Ossenkopp
- 👤 executor by Eva-Maria Berg
- 👤 executor by Helga Schonekas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:44
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/50; A61L27/58; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30734; A61F2/30767; A61F2/32; A61F2/36; A61F2/3662; A61F2/3676; A61L27/28; A61L27/34; A61F2/367; A61F2/46; A61F2/4603; A61F2/4607; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30032; A61F2002/3006; A61F2002/30062; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30113; A61F2002/30138; A61F2002/30143; A61F2002/30199; A61F2002/30224; A61F2002/30738; A61F2/30771; A61F2002/30795; A61F2002/30797; A61F2002/30813; A61F2/30907; A61F2002/30919; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2002/365; A61F2210/00; A61F2210/0004; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0006; A61F2230/0017; A61F2230/0063; A61F2230/0069; A61F2250/00; A61F2250/0014; A61F2250/003; A61F2250/0031; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00023; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
A femoral prosthesis having an upper body part and a stem, the upper body part and the stem having a first bone ingrowth promoting coating which is formed from a material which will promote ingrowth of bone onto said upper body part and said stem, said stem having an upper stem portion adjacent to said upper body part and a lower stem portion, only said lower stem portion having a second coating which is formed from a bioabsorbable material which will be absorbed during the time taken for the prosthesis to be held in place by ingrowth of bone onto said upper stem portion and said upper body part wherein said second coating delays the ingrowth of bone around the lower stem portion until the second coating is substantially absorbed.
Claim 2
Dependent Claim
130 words
A femoral prosthesis having an upper body part and a stem, the upper body part and the stem having a first bone ingrowth promoting coating which is formed from a material which will promote ingrowth of bone onto said upper body part and said stem, said stem having an upper stem portion adjacent to said upper body part and a lower stem portion, only said lower stem portion having a second coating which is formed from a bioabsorbable material which will be absorbed during the time taken for the prosthesis to be held in place by ingrowth of bone onto said upper stem portion and said upper body part wherein said second coating delays the ingrowth of bone around the lower stem portion until the second coating is substantially absorbed.
Claim 3
Dependent Claim
27 words
A femoral prosthesis according to claim 1, wherein the second coating formed from a bioabsorbable material has an absorption rate of up to three months after implantation.
Claim 4
Dependent Claim
20 words
A femoral prosthesis according to claim 1, wherein the second coating is a homopolymer or copolymer of lactide and glycolide.
Claim 5
Dependent Claim
22 words
A femoral prosthesis according to claim 3, wherein the second coating is an 85:15 copolymer of lactide and glycolide: poly(DL lactide-co-glycolide) 85:15.
Claim 6
Dependent Claim
23 words
A femoral prosthesis according to claim 1, wherein the second coating is in the form of a sleeve around the lower stem portion.
Claim 7
Dependent Claim
23 words
A femoral prosthesis according to claim 1, wherein the second coating is in the form of a sheath covering the lower stem portion.
Claim 8
Dependent Claim
23 words
A femoral prosthesis according to claim 5, wherein the sleeve is preformed from a sheet of said material which forms said second coating.
Claim 9
Dependent Claim
23 words
A femoral prosthesis according to claim 6, wherein the sheath is preformed from a sheet of said material which forms said second coating.
Claim 10
Independent Claim
130 words
A method of anchoring a femoral prosthesis having a stem and an upper body part in a desired orientation with the stem and the upper body part inside a suitably prepared tubular cavity, said stem having an upper stem portion adjacent said upper body part and a lower stem portion, and said stem and said upper body part having a first bone ingrowth promoting coating of a material which promotes the ingrowth of bone, said method comprising: providing only the lower stem portion with a second coating formed from a material which is absorbed thereby delaying the ingrowth of bone around the lower stem portion during a period of time taken for ingrowth of bone onto the upper stem portion and onto the upper body part to anchor the prosthesis.
Claim 11
Independent Claim
130 words
A method of anchoring a femoral prosthesis having a stem and an upper body part in a desired orientation with the stem and the upper body part inside a suitably prepared tubular cavity, said stem having an upper stem portion adjacent said upper body part and a lower stem portion, and said stem and said upper body part having a first bone ingrowth promoting coating of a material which promotes the ingrowth of bone, said method comprising: providing only the lower stem portion with a second coating formed from a material which is absorbed thereby delaying the ingrowth of bone around the lower stem portion during a period of time taken for ingrowth of bone onto the upper stem portion and onto the upper body part to anchor the prosthesis.
Claim 12
Dependent Claim
22 words
A method according to claim 9 wherein the second coating is in the form of a sleeve around the lower stem portion.
References Cited (Backward Citations)
US4280233A
Cited
US4495664A
Cited
US4636214B1
Cited
US4636214A
Cited
US4539981A
Cited
US4990161A
Cited
US4713076A
Cited
EP0169001A2
Cited
US5084050A
Cited
JPS61213047A
Cited
US5181928A
Cited
US5176712A
Cited
US5062854A
Cited
US5035713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 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 |