US5314492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite prosthesis
Assignee: Johnson and Johnson Professional Inc
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Filing: 1992-05-11
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Granted: 1994-05-24
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Expires: 2012-05-11
Abstract
Abstract A composite stem for a prosthesis, particularly a hip prosthesis, including a metal core and a fiber reinforced composite shell surrounding the core to provide modulus values that are similar to bone. The composite shell is preferably composed of braided fibers and a thermoplastic resin. The stiffness of the prosthesis can be varied along the length of the stem. The metal core contributing between 5 and 25 percent of the total flexural stiffness of the stem.
Inventors
- 👤 John V. Hamilton
- 👤 Salvatore Caldarise
- 👤 Debra J. Treacy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:39
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/68; B29C70/86; A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30907; A61F2/3094; A61F2/30965; A61L; A61L27/00; A61L27/40; A61L27/44; A61L27/443; B29C35/00; B29C35/02; B29C35/0272; A61F2/32; A61F2/36; A61F2/3662; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30009; A61F2002/30014; A61F2002/3006; A61F2002/30065; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30354; A61F2002/30357; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2002/365; A61F2002/3652; A61F2210/00; A61F2210/0071; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2250/00; A61F2250/0014; A61F2250/0018; A61F2250/0028; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00029; B29C2035/0211; B29L; B29L2031/00; B29L2031/753; B29L2031/7532; Y; Y10; Y10S; Y10S623/00; Y10S623/909; Y10S623/911; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49895; Y10T29/49897
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
105 words
A load bearing orthopaedic prosthesis comprising a stem having a distal end adapted to be inserted into a cavity formed in a bone and a proximal end opposed to the distal end; said stem comprising an inner metal core extending substantially the length of the stem from the proximal end to the distal end of the prosthesis; a composite shell comprising braided high strength fibers bonded with a thermoplastic resin surrounding said metal core along substantially the entire length thereof; said metal core contributing between 5 and 25% of the total flexural stiffness of the stem at any position along the length of the stem.
Claim 2
Dependent Claim
105 words
A load bearing orthopaedic prosthesis comprising a stem having a distal end adapted to be inserted into a cavity formed in a bone and a proximal end opposed to the distal end; said stem comprising an inner metal core extending substantially the length of the stem from the proximal end to the distal end of the prosthesis; a composite shell comprising braided high strength fibers bonded with a thermoplastic resin surrounding said metal core along substantially the entire length thereof; said metal core contributing between 5 and 25% of the total flexural stiffness of the stem at any position along the length of the stem.
Claim 3
Dependent Claim
122 words
A load bearing orthopaedic prosthesis comprising a stem having a distal end adapted to be inserted into a cavity formed in a bone and a proximal end opposed to the distal end; said stem comprising an inner metal core extending substantially the length of the stem from the proximal end to the distal end of the prosthesis; a composite shell comprising high strength fibers bonded with a thermoplastic resin surrounding said metal core along substantially the entire length thereof; said composite shell comprising between 40 and 75 weight percent fiber and 25 to 60 weight percent resin; said metal core contributing between 5 and 25% of the total flexural stiffness of the stem at any position along the length of the stem.
Claim 4
Dependent Claim
122 words
A load bearing orthopaedic prosthesis comprising a stem having a distal end adapted to be inserted into a cavity formed in a bone and a proximal end opposed to the distal end; said stem comprising an inner metal core extending substantially the length of the stem from the proximal end to the distal end of the prosthesis; a composite shell comprising high strength fibers bonded with a thermoplastic resin surrounding said metal core along substantially the entire length thereof; said composite shell comprising between 40 and 75 weight percent fiber and 25 to 60 weight percent resin; said metal core contributing between 5 and 25% of the total flexural stiffness of the stem at any position along the length of the stem.
Claim 5
Dependent Claim
12 words
The prosthesis of claim 1 in which the metal core is tapered.
Claim 6
Dependent Claim
14 words
The prosthesis of claim 1 in which the metal core is a Ti-6Al-4V alloy.
Claim 7
Dependent Claim
17 words
The prosthesis of claim 1 in which the composite shell comprises carbon fibers and a polyetheretherketone resin.
Claim 8
Dependent Claim
24 words
The prosthesis of claim 1 further comprising an insert located at the proximal end of the prosthesis between the core and the composite shell.
Claim 9
Dependent Claim
19 words
The prosthesis of claim 6 in which the insert is made of the same material as the braided shell.
Claim 10
Dependent Claim
19 words
The prosthesis of claim 6 in which the insert is made of the same material as the metal core.
Claim 11
Dependent Claim
29 words
The prosthesis of claim 2 in which the thickness of the composite shell is greater at the distal end of the stem than the proximal end of the stem.
Claim 12
Dependent Claim
35 words
The prosthesis of claim 2 in which the fibers in the composite shell are braided and are oriented at an angle of from 30 degrees to 75 degrees to the longitudinal axis of the stem.
Claim 13
Dependent Claim
28 words
The prosthesis of claim 1 in which the flexural stiffness of the stem varies from the proximal end of the item to the distal end of the stem.
Claim 14
Dependent Claim
120 words
A load bearing orthopaedic prosthesis comprising a stem having a distal end adapted to be inserted into a cavity formed in a bone and a proximal end opposed to the distal end; said stem comprising an inner metal core extending substantially the length of the stem from the proximal end to the distal end of the prosthesis; a composite braided shell comprising a high strength fiber bonded with a thermoplastic resin surrounding the metal core; an insert located at the proximal end of the prosthesis and disposed between the metal core and the composite shell; said metal core contributing between 5 and 25% of the total flexural stiffness of the stem at any position along the length of the stem.
Claim 15
Dependent Claim
120 words
A load bearing orthopaedic prosthesis comprising a stem having a distal end adapted to be inserted into a cavity formed in a bone and a proximal end opposed to the distal end; said stem comprising an inner metal core extending substantially the length of the stem from the proximal end to the distal end of the prosthesis; a composite braided shell comprising a high strength fiber bonded with a thermoplastic resin surrounding the metal core; an insert located at the proximal end of the prosthesis and disposed between the metal core and the composite shell; said metal core contributing between 5 and 25% of the total flexural stiffness of the stem at any position along the length of the stem.
Claim 16
Dependent Claim
19 words
The prosthesis of claim 12 in which the insert is made of the same material as the braided shell.
Claim 17
Dependent Claim
19 words
The prosthesis of claim 12 in which the insert is made of the same material as the metal core.
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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) | 1997-05-23 | 1997-11-22 | 1998-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-23 | 2001-11-22 | 2002-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-23 | 2005-11-22 | 2006-05-24 | $7700.00 | Window Closed / Lapsed |