US5236458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bioreactive material for a prosthesis or composite implants
Assignee: FBFC International SA
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Filing: 1992-08-24
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Granted: 1993-08-17
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Expires: 2012-08-24
Abstract
Abstract A sintered, shaped long-life dental implant or osseous prosthesis adapted for implantation into a human or animal body with chemical bonding to bone tissue. The implant or prosthesis is the result of sintering of a shaped mass of bioglass particles at or above a temperature softening the bioglass particles to form a bioreactive material having a composition comprising, by weight, 5-14% Na 2 O, 0-12% P 2 O 5 , 49-57% SiO 2 , and balance, no more than 33% CaO+CaF 2 , with the bioreactive material containing 0.5-7% CaF 2 . The implant or prosthesis has limited reactivity with bone tissue and a coefficient of expansion less than 10 -5 K -1 from 0° to 100° C.
Inventors
- 👤 Paul Ducheyne
- 👤 Louis Van Hove
- 👤 Evert Schepers
- 👤 Raymond Kempenners
- 👤 Marcel De Clercq, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:32
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/12; A61L27/10; A61L27/40; A61L27/42; C; C03; C03C; C03C10/00; C03C10/0009; C03C10/16; C03C14/00; C03C14/002; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112; C03C4/00; C03C4/0007; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; A61L2430/00; A61L2430/02; C03C2214/00; C03C2214/02; C03C2214/08; C03C2214/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
116 words
A sintered, shaped long-life dental implant or osseous prosthesis configured to be implanted into a human or animal body with chemical bonding to bone tissue, said implant or prosthesis resulting from sintering of a shaped mass of bioglass particles at or above a temperature softening the bioglass particles, to form a bioreactive material having a composition comprising, by weight: ______________________________________
5-14% Na.sub.2 O;
0-12% P.sub.2 O.sub.5 ;
49-57% SiO.sub.2 ;
______________________________________ balance, less than or equal to 33% CaO+CaF 2 , said bioreactive material containing 0.5-7% CaF 2 ; and said implant or prosthesis having limited reactivity with bone tissue and a coefficient of expansion less than 10 -5 K -1 from 0° to 100° C.
Claim 2
Dependent Claim
116 words
A sintered, shaped long-life dental implant or osseous prosthesis configured to be implanted into a human or animal body with chemical bonding to bone tissue, said implant or prosthesis resulting from sintering of a shaped mass of bioglass particles at or above a temperature softening the bioglass particles, to form a bioreactive material having a composition comprising, by weight: ______________________________________
5-14% Na.sub.2 O;
0-12% P.sub.2 O.sub.5 ;
49-57% SiO.sub.2 ;
______________________________________ balance, less than or equal to 33% CaO+CaF 2 , said bioreactive material containing 0.5-7% CaF 2 ; and said implant or prosthesis having limited reactivity with bone tissue and a coefficient of expansion less than 10 -5 K -1 from 0° to 100° C.
Claim 3
Dependent Claim
13 words
An implant or prosthesis according to claim 1, additionally comprising a structural material.
Claim 4
Dependent Claim
23 words
The implant or prosthesis of claim 2, which is a reinforced composite, wherein said sintered particles and said structural material are intimately bonded.
Claim 5
Dependent Claim
38 words
The composite of claim 2, which is a plated composite, wherein said bioreactive material covers said structural material, the structural material being selected from the group consisting of a solid piece, a hollow piece and a filled piece.
Claim 6
Dependent Claim
30 words
The implant or prosthesis of claim 2, 3, or 4, wherein the structural material is selected from the group consisting of ceramic fibres, metallic fibres, carbides, borides, nitrides and monocrystals.
Claim 7
Dependent Claim
28 words
The composite of claim 2 or 3, wherein the structural material is selected form the group consisting of grains and fibres, and is dispersed in the bioreactive material.
Claim 8
Dependent Claim
28 words
The implant or prosthesis of claim 2 or 3, wherein the structural material is a porous skeleton, the pore volume of which is occupied by the sintered particles.
Claim 9
Dependent Claim
29 words
The implant or prosthesis of claim 7, wherein the skeleton has a pore volume of from 15 to 90% of the total volume, before occupation by the sintered particles.
Claim 10
Dependent Claim
23 words
The composite of claim 7, wherein the porous skeleton is selected from the group consisting of a fibrous preform and a sintered material.
Claim 11
Dependent Claim
19 words
The implant or prosthesis of claim 8, wherein the skeleton has a pore volume of from 30 to 70%.
Claim 12
Dependent Claim
22 words
The composite of claim 3 or 4, wherein the structural material is selected from the group consisting of Ti and Ti alloys.
Claim 13
Dependent Claim
25 words
The composite of claim 3 or 4, wherein the structural material is selected from the group consisting of Ta, Nb, Ta alloys and Nb alloys.
Claim 14
Dependent Claim
20 words
The implant or prosthesis of claim 2, 3, or 4 in the shape of a human or animal bone prostheses.
Claim 15
Dependent Claim
23 words
An implant or prosthesis according to claim 1, wherein the shaped mass of bioglass particles is sintered at a temperature of 500°-850° C.
Claim 16
Dependent Claim
60 words
The implant or prosthesis of claim 1, said bioreactive materials comprises to 12% of Na 2 O, 4 to 8% of P 2 O 5 , 50 to 54% of SiC 2 , the balance being less than or equal to 33% of a mixture of CaC and CaF 2 and containing from 0.5 to 5% of CaF 2 .
Claim 17
Dependent Claim
24 words
The implant or prosthesis of claim 1, wherein said bioreactive material comprises crystallized glass in which the final crystallization rate is at least 40%.
Claim 18
Dependent Claim
16 words
The implant or prosthesis of claim 16, wherein the final crystallization rate is greater than 80%.
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) | 1996-08-16 | 1997-02-15 | 1997-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-16 | 2001-02-15 | 2001-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-16 | 2005-02-15 | 2005-08-17 | $7700.00 | Window Closed / Lapsed |