US5522904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite femoral implant having increased neck strength
Assignee: Biomet Manufacturing LLC
•
Filing: 1993-10-13
•
Granted: 1996-06-04
•
Expires: 2013-10-13
Abstract
Abstract A femoral implant for a hip prosthesis includes a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle theta to the longitudinal direction. The implant includes a plurality of layers of fibers in a matrix, wherein the fibers are substantially unidirectional in each respective layer. The implant is made from a stack of layers of the matrix so that the direction of fibers is unbalanced. At least 50% of the fibers are oriented in the theta direction and the remainder of said fibers are oriented in directions other than the theta angle.
Inventors
- 👤 James M. Moran
- 👤 Richard A. Salzstein
- 👤 Isaac M. Daniel
- 👤 Douglas S. Cairns
- 👤 Daniel B. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:15
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/40; A61L27/44; A61L27/443; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/3094; A61F2/30965; A61F2/32; A61F2/36; A61F2/3609; B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/20; B29C70/202; A61F2/3662; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30009; A61F2002/30014; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2/30942; A61F2002/30952; A61F2002/30957; A61F2002/3611; A61F2002/3625; A61F2002/365; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2250/00; A61F2250/0014; A61F2250/0018; A61F2250/0028; B29C2793/00; B29C2793/009; B29L; B29L2031/00; B29L2031/753; B29L2031/7532
Claims Analysis
Total Claims: 63
Claim 1
Independent Claim
86 words
A femoral implant for a hip prosthesis comprising: a shaft oriented in a longitudinal direction; a neck extending from said shaft at an acute angle θ to the longitudinal direction; said implant comprises a plurality of layers of fibers in a matrix, wherein said fibers are substantially unidirectional in each respective layer; wherein at least 50% of said fibers of the implant are oriented in the θ direction and the remainder of said fibers of the implant are oriented in directions other than the θ angle.
Claim 2
Dependent Claim
86 words
A femoral implant for a hip prosthesis comprising: a shaft oriented in a longitudinal direction; a neck extending from said shaft at an acute angle θ to the longitudinal direction; said implant comprises a plurality of layers of fibers in a matrix, wherein said fibers are substantially unidirectional in each respective layer; wherein at least 50% of said fibers of the implant are oriented in the θ direction and the remainder of said fibers of the implant are oriented in directions other than the θ angle.
Claim 3
Dependent Claim
21 words
The implant according to claim 1, wherein about 50 to about 60% of said fibers are oriented in the θ direction.
Claim 4
Dependent Claim
21 words
The implant according to claim 1, wherein about 40 to about 50% of said fibers are oriented in the longitudinal direction.
Claim 5
Dependent Claim
14 words
The implant according to claim 1, wherein said acute angle θ is about 25°-55°.
Claim 6
Dependent Claim
13 words
The implant according to claim 1, wherein said matrix comprises a biocompatible matrix.
Claim 7
Dependent Claim
13 words
The implant according to claim 1, wherein said matrix comprises a polymeric matrix.
Claim 8
Dependent Claim
36 words
The implant according to claim 1, wherein said matrix is selected from the group consisting of polysulfone, polyethersulphone, polyarylsulfone, polyphenylene sulfide, polycarbonates, aromatic polyamides, aromatic polyamideimides, thermoplastic polyimides, polyaryletherketones, polyetheretherketones, polyarylethernitriles, aromatic polyhydroxyethers, and mixtures thereof.
Claim 9
Dependent Claim
24 words
The implant according to claim 1, wherein said matrix is selected from the group consisting of ceramics, metals, carbon, epoxies, acrylics, and mixtures thereof.
Claim 10
Dependent Claim
12 words
The implant according to claim 1, wherein said matrix comprises polysulfone resin.
Claim 11
Dependent Claim
11 words
The implant according to claim 1, wherein said fibers comprise carbon.
Claim 12
Dependent Claim
13 words
The implant according to claim 1, wherein said fibers comprise a ceramic material.
Claim 13
Dependent Claim
11 words
The implant according to claim 1, wherein said fibers comprise boron.
Claim 14
Dependent Claim
11 words
The implant according to claim 1, wherein said fibers comprise metal.
Claim 15
Dependent Claim
12 words
The implant according to claim 1, wherein said fibers comprise a polymer.
Claim 16
Dependent Claim
12 words
The implant according to claim 1, wherein said fibers comprise aramid fibers.
Claim 17
Dependent Claim
11 words
The implant according to claim 1, wherein said fibers comprise fiberglass.
Claim 18
Dependent Claim
18 words
The implant according to claim 1, wherein said remainder of said fibers are oriented in the longitudinal direction.
Claim 19
Dependent Claim
15 words
The implant according to claim 1, wherein the number of layers is at least 100.
Claim 20
Dependent Claim
14 words
The implant according to claim 1, wherein the number of layers is about 100-300.
Claim 21
Dependent Claim
19 words
The implant according to claim 1, wherein the compressive strength of the neck is at least about 80 ksi.
Claim 22
Dependent Claim
42 words
The implant according to claim 1, wherein said acute angle θ is about 25°-55°, said layers are flat, said matrix comprises a biocompatible matrix, and said fibers are selected from the group consisting of carbon, ceramic, boron, metal, aramid and fiberglass fibers.
Claim 23
Dependent Claim
37 words
The implant according to claim 1, wherein said acute angle θ is about 35°-45°, said layers are flat, said matrix comprises a biocompatible polymeric matrix, said fibers comprise carbon and the number of layers is about 100-300.
Claim 24
Dependent Claim
21 words
A femoral implant as in claim 1 wherein the remainder of the fibers are oriented within ±10° from the longitudinal direction.
Claim 25
Dependent Claim
14 words
The implant according to claim 1, wherein said acute angle θ is about 35°-45°.
Claim 26
Dependent Claim
14 words
The implant according to claim 24, wherein said acute angle θ is about 40°.
Claim 27
Dependent Claim
82 words
A femoral implant for a hip prosthesis comprising: a shaft oriented in a longitudinal-direction and a neck extending from said shaft at an acute angle θ to the longitudinal direction; wherein said implant comprises a plurality of layers of fibers in a matrix, wherein said fibers are substantially unidirectional in each respective layer; and wherein more of said fibers of the implant are oriented in the θ direction than are fibers of the implant oriented in directions other than the θ angle.
Claim 28
Dependent Claim
82 words
A femoral implant for a hip prosthesis comprising: a shaft oriented in a longitudinal-direction and a neck extending from said shaft at an acute angle θ to the longitudinal direction; wherein said implant comprises a plurality of layers of fibers in a matrix, wherein said fibers are substantially unidirectional in each respective layer; and wherein more of said fibers of the implant are oriented in the θ direction than are fibers of the implant oriented in directions other than the θ angle.
Claim 29
Dependent Claim
22 words
The implant according to claim 26, wherein more of said fibers are oriented in the θ direction than in the longitudinal direction.
Claim 30
Dependent Claim
42 words
The implant according to claim 26, wherein said acute angle θ is about 25°-55°, said layers are flat, said matrix comprises a biocompatible matrix, and said fibers are selected from the group consisting of carbon, ceramic, boron, metal, aramid and fiberglass fibers.
Claim 31
Dependent Claim
37 words
The implant according to claim 26, wherein said acute angle θ is about 35°-45°, said layers are flat, said matrix comprises a biocompatible polymeric matrix, said fibers comprise carbon and the number of layers is about 100-300.
Claim 32
Dependent Claim
77 words
A femoral implant for a hip prosthesis comprising: a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to the longitudinal direction; wherein said implant comprises a plurality of layers of fibers in a matrix, wherein said fibers are substantially unidirectional in each respective layer; and wherein more of said layers contain fibers oriented in the θ direction than said layers contain fibers oriented in the shaft direction.
Claim 33
Dependent Claim
77 words
A femoral implant for a hip prosthesis comprising: a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to the longitudinal direction; wherein said implant comprises a plurality of layers of fibers in a matrix, wherein said fibers are substantially unidirectional in each respective layer; and wherein more of said layers contain fibers oriented in the θ direction than said layers contain fibers oriented in the shaft direction.
Claim 34
Dependent Claim
42 words
The implant according to claim 30, wherein said acute angle θ is about 25°-55°, said layers are flat, said matrix comprises a biocompatible matrix, and said fibers are selected from the group consisting of carbon, ceramic, boron, metal, aramid and fiberglass fibers.
Claim 35
Dependent Claim
37 words
The implant according to claim 30, wherein said acute angle θ is about 35°-45°, said layers are flat, said matrix comprises a biocompatible polymeric matrix, said fibers comprise carbon and the number of layers is about 100-300.
Claim 36
Independent Claim
113 words
A method of making a femoral implant for a hip prosthesis having a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to said longitudinal direction comprising the steps of: forming a plurality of individual layers of substantially unidirectional fibers in a matrix; stacking said layers such that at least 50% of said fibers of the implant are oriented at said angle θ and the remainder are oriented in directions other than the θ angle; heating the stacked layers under pressure to melt said matrix; cooling said matrix to form a composite block; and machining said stacked layers into the form of the implant.
Claim 37
Independent Claim
113 words
A method of making a femoral implant for a hip prosthesis having a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to said longitudinal direction comprising the steps of: forming a plurality of individual layers of substantially unidirectional fibers in a matrix; stacking said layers such that at least 50% of said fibers of the implant are oriented at said angle θ and the remainder are oriented in directions other than the θ angle; heating the stacked layers under pressure to melt said matrix; cooling said matrix to form a composite block; and machining said stacked layers into the form of the implant.
Claim 38
Dependent Claim
42 words
The method according to claim 33, wherein said acute angle θ is about 25°-55°, said layers are flat, said matrix comprises a biocompatible matrix, and said fibers are selected from the group consisting of carbon, ceramic, boron, metal, aramid and fiberglass fibers.
Claim 39
Dependent Claim
37 words
The method according to claim 33, wherein said acute angle θ is about 35°-45°, said layers are flat, said matrix comprises a biocompatible polymeric matrix, said fibers comprise carbon and the number of layers is about 100-300.
Claim 40
Independent Claim
89 words
A method of performing hip-joint replacement surgery comprising implanting a femoral implant comprising a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to the longitudinal direction; wherein said implant comprises a plurality of layers of fibers in a matrix wherein said fibers are unidirectional in each respective layer; and wherein at least 50% of said layers have fibers oriented in the θ direction and the remainder of said layers have fibers oriented in directions other than the θ angle.
Claim 41
Independent Claim
89 words
A method of performing hip-joint replacement surgery comprising implanting a femoral implant comprising a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to the longitudinal direction; wherein said implant comprises a plurality of layers of fibers in a matrix wherein said fibers are unidirectional in each respective layer; and wherein at least 50% of said layers have fibers oriented in the θ direction and the remainder of said layers have fibers oriented in directions other than the θ angle.
Claim 42
Dependent Claim
42 words
The method according to claim 36, wherein said acute angle θ is about 25°-55°, said layers are flat, said matrix comprises a biocompatible matrix, and said fibers are selected from the group consisting of carbon, ceramic, boron, metal, aramid and fiberglass fibers.
Claim 43
Dependent Claim
37 words
The method according to claim 36, wherein said acute angle θ is about 35°-45°, said layers are flat, said matrix comprises a biocompatible polymeric matrix, said fibers comprise carbon and the number of layers is about 100-300.
Claim 44
Dependent Claim
85 words
A femoral implant for a hip prosthesis comprising a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to the longitudinal direction; wherein said implant comprises a plurality of layers of fibers in a matrix, and said fibers are substantially unidirectional in each respective layer; and wherein at least 50% of the layers have fibers oriented in the θ direction and the remainder of the layers have fibers oriented in directions other than the θ angle.
Claim 45
Dependent Claim
85 words
A femoral implant for a hip prosthesis comprising a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to the longitudinal direction; wherein said implant comprises a plurality of layers of fibers in a matrix, and said fibers are substantially unidirectional in each respective layer; and wherein at least 50% of the layers have fibers oriented in the θ direction and the remainder of the layers have fibers oriented in directions other than the θ angle.
Claim 46
Dependent Claim
35 words
A femoral implant for a hip prosthesis as claimed in claim 39 wherein the implant is made from a stack of layers of fibers and matrix so that the direction of the fibers is unbalanced.
Claim 47
Dependent Claim
30 words
A femoral implant as in claim 39 wherein more of the fibers may he oriented in the θ direction than are fibers oriented in directions other that the θ angle.
Claim 48
Dependent Claim
50 words
A femoral implant as in claim 39 wherein at least as much of the fibers are oriented in the θ direction as are fibers oriented in the shaft direction, the number of fibers oriented in the θ direction being different than the number of fibers oriented in the shaft direction.
Claim 49
Dependent Claim
43 words
A femoral implant according to claim 39, wherein said acute angle θ is about 25°-55°, said layers are flat, said matrix comprises a biocompatible matrix, and said fibers are selected from the group consisting of carbon, ceramic, boron, metal, aramid and fiberglass fibers.
Claim 50
Dependent Claim
38 words
A femoral implant according to claim 39, wherein said acute angle θ is about 35°-45°, said layers are flat, said matrix comprises a biocompatible polymeric matrix, said fibers comprise carbon and the number of layers is about 100-300.
Claim 51
Dependent Claim
21 words
A femoral implant as in claim 39 wherein the remainder of the fibers are oriented within ±10° from the longitudinal direction.
Claim 52
Dependent Claim
43 words
A femoral implant according to claim 45, wherein said acute angle θ is about 25°-55°, said layers are flat, said matrix comprises a biocompatible matrix, and said fibers are selected from the group consisting of carbon, ceramic, boron, metal, aramid and fiberglass fibers.
Claim 53
Dependent Claim
38 words
A femoral implant according to claim 45, wherein said acute angle θ is about 35°-45°, said layers are flat, said matrix comprises a biocompatible polymeric matrix, said fibers comprise carbon and the number of layers is about 100-300.
Claim 54
Independent Claim
114 words
A method of making a femoral implant for hip prosthesis having a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to said longitudinal direction comprising the steps of: forming a plurality of individual layers of substantially unidirectional fibers in a matrix; stacking the layers such that at least 50% of the layers have fibers oriented in the θ direction and the remainder of the layers have fibers oriented in directions other than the θ angle; heating the stacked layers under pressure to melt said matrix; cooling said matrix to form a composite block; and machining said stacked layers into the form of the implant.
Claim 55
Independent Claim
114 words
A method of making a femoral implant for hip prosthesis having a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to said longitudinal direction comprising the steps of: forming a plurality of individual layers of substantially unidirectional fibers in a matrix; stacking the layers such that at least 50% of the layers have fibers oriented in the θ direction and the remainder of the layers have fibers oriented in directions other than the θ angle; heating the stacked layers under pressure to melt said matrix; cooling said matrix to form a composite block; and machining said stacked layers into the form of the implant.
Claim 56
Dependent Claim
27 words
A method of making a femoral implant for hip prosthesis as claimed in claim 48 wherein said heating step is carried out prior to said maching step.
Claim 57
Dependent Claim
41 words
A method of making a femoral implant for hip prosthesis as claimed in claim 48 comprising sequentially said machining the stacked layers into the form of the implant and then said heating the stacked layers under pressure to melt said matrix.
Claim 58
Dependent Claim
42 words
The method according to claim 48, wherein said layers are flat, said acute angle θ is about 25°-55°, said matrix comprises a biocompatible matrix, and said fibers are selected from the group consisting of carbon, ceramic, boron, metal, aramid and fiberglass fibers.
Claim 59
Dependent Claim
37 words
The method according to claim 48, wherein said acute angle θ is about 35°-45°, said layers are flat, said matrix comprises a biocompatible polymeric matrix, said fibers comprise carbon and the number of layers is about 100-300.
Claim 60
Dependent Claim
42 words
The method according to claim 48, wherein said acute angle θ is about 25°-55°, said layers are flat, said matrix comprises a biocompatible matrix, and said fibers are selected from the group consisting of carbon, ceramic, boron, metal, aramid and fiberglass fibers.
Claim 61
Dependent Claim
37 words
The method according to claim 48, wherein said acute angle θ is about 35°-45°, said layers are flat, said matrix comprises a biocompatible polymeric matrix, said fibers comprise carbon and the number of layers is about 100-300.
Claim 62
Independent Claim
89 words
A method of performing hip-joint replacement surgery comprising implanting a femoral implant comprising a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to the longitudinal direction; wherein said implant comprises a plurality of layers of fibers in a matrix and said fibers are unidirectional in each respective layer; and wherein at least 50% of said layers have fibers oriented in the θ direction and the remainder of said layers have fibers oriented in directions other than the θ angle.
Claim 63
Independent Claim
89 words
A method of performing hip-joint replacement surgery comprising implanting a femoral implant comprising a shaft oriented in a longitudinal direction and a neck extending from said shaft at an acute angle θ to the longitudinal direction; wherein said implant comprises a plurality of layers of fibers in a matrix and said fibers are unidirectional in each respective layer; and wherein at least 50% of said layers have fibers oriented in the θ direction and the remainder of said layers have fibers oriented in directions other than the θ angle.
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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) | 1999-06-04 | 1999-12-04 | 2000-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-04 | 2003-12-04 | 2004-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-04 | 2007-12-04 | 2008-06-04 | $7700.00 | Window Closed / Lapsed |