US4604097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bioabsorbable glass fibers for use in the reinforcement of bioabsorbable polymers for bone fixation devices and artificial ligaments
Assignee: University of Dayton
•
Filing: 1985-02-19
•
Granted: 1986-08-05
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Expires: 2005-02-19
Abstract
Abstract A spun or drawn glass fiber for use in the area of medical implants, and particularly as a reinforcement for bioabsorbable polymeric orthopaedic and dental implants. The glass fiber is bioabsorbable and has sufficient tensile strength and elasticity to be used as a reinforcement. It is made up of 5-50% calcium oxide (CaO), 50-95% phosphorous pentoxide (P2O5), 0-5% calcium fluoride (CaF2), 0-5% water (H2O), and 0-10% XO wherein X is either a single magnesium, zinc or strontium ion or two sodium, potassium, lithium, or aluminum ions and when X is aluminum the O represents three oxygen ions.
Inventors
- 👤 George A. Graves, Jr.
- 👤 Binod Kumar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:48
CPC Classifications
C; C03; C03C; C03C13/00; A; A61; A61C; A61C8/00; A61C8/0012; A61F; A61F2/00; A61F2/02; A61F2/08; A61F2/28; A61F2/30; A61F2/3094; A61F2/30965; A61L; A61L27/00; A61L27/02; A61L27/12; A61L27/40; A61L27/44; A61L27/46; A61L27/50; A61L27/58; C03C4/00; C03C4/0007; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30062; A61F2210/00; A61F2210/0004; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; C03C2213/00; C03C2213/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
29 words
A spun or drawn glass fiber, which is bioabsorbable and useful in the area of medical implants, comprising calcium oxide (CaO) and phosphrous pentoxide (P 2 O 5 ).
Claim 2
Dependent Claim
29 words
A spun or drawn glass fiber, which is bioabsorbable and useful in the area of medical implants, comprising calcium oxide (CaO) and phosphrous pentoxide (P 2 O 5 ).
Claim 3
Dependent Claim
18 words
The glass fiber of claim 1 wherein said fiber has a diameter in the range of 1-100 microns.
Claim 4
Dependent Claim
18 words
The glass fiber of claim 2 wherein said fiber has a diameter in the range of 5-25 microns.
Claim 5
Dependent Claim
61 words
The glass fiber of claim 2 wherein said glass fiber comprises by weight: ______________________________________
CaO 5-50%
P.sub.2 O.sub.5
50-95%
CaF.sub.2
0-5%
H.sub.2 O
0-5%
XO 0-10%
______________________________________ wherein X is selected from the group consisting of a single magnesium, zinc or strontium ion and two sodium, potassium, lithium or aluminum ions, and when X is aluminum O is three oxygen ions.
Claim 6
Dependent Claim
38 words
The glass fiber of claim 4 wherein said calcium oxide (CaO) is present by weight in the amount of 15-25% and said phosphorous pentoxide (P 2 O 5 ) is present by weight in the amount of 65-90%.
Claim 7
Dependent Claim
22 words
The glass fiber of claim 4 wherein said calcium fluoride (CaF 2 ) is present by weight in the amount of 0.1-4%.
Claim 8
Dependent Claim
21 words
The glass fiber of claim 4 wherein said water (H 2 O) is present by weight in the amount of 0.1-4%.
Claim 9
Dependent Claim
16 words
The glass fiber of claim 1 wherein the Ca:P atomic ratio is about 0.25 to 0.33.
Claim 10
Dependent Claim
71 words
A reinforcement for a bioabsorbable polymeric orthopaedic or dental implant comprising a drawn or spun glass fiber made up of by weight of: ______________________________________
CaO 5-50%
P.sub.2 O.sub.5
50-95%
CaF.sub.2
0-5%
H.sub.2 O
0-5%
XO 0-10%
______________________________________ wherein X is selected from the group consisting of a single magnesium, zinc or strontium ion and two sodium, potassium, lithium or aluminum ions, and when X is aluminum O is three oxygen ions.
Claim 11
Dependent Claim
71 words
A reinforcement for a bioabsorbable polymeric orthopaedic or dental implant comprising a drawn or spun glass fiber made up of by weight of: ______________________________________
CaO 5-50%
P.sub.2 O.sub.5
50-95%
CaF.sub.2
0-5%
H.sub.2 O
0-5%
XO 0-10%
______________________________________ wherein X is selected from the group consisting of a single magnesium, zinc or strontium ion and two sodium, potassium, lithium or aluminum ions, and when X is aluminum O is three oxygen ions.
Claim 12
Dependent Claim
19 words
The reinforcement of claim 9 wherein said fiber has a diameter in the range of 5 to 25 microns.
Claim 13
Dependent Claim
19 words
The reinforcement of claim 10 wherein said fiber has a diameter in the range of 8 to 15 microns.
Claim 14
Dependent Claim
28 words
The reinforcement of claim 11 wherein said fiber has a tensile strength of 30,000 to 200,000 psi and a Young's modulus of 2×10 6 to 7×10 6 psi.
Claim 15
Dependent Claim
23 words
The reinforcement of claim 12 wherein said glass fiber comprises by weight: ______________________________________
CaO 15-25%,
P.sub.2 O.sub.5
65-90%, and
H.sub.2 O 0.1-4%.
______________________________________
Claim 16
Dependent Claim
14 words
The reinforcement of claim 9 wherein the Ca:P atomic ratio is 0.25 to 0.33.
Claim 17
Dependent Claim
22 words
The glass fiber of claim 1 wherein said fiber has a melt viscosity of 1000 to 10,000 poise at its drawing temperature.
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) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |