US4904257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous bone filler and process of producing the same
Assignee: Pentax Corp
•
Filing: 1988-07-06
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Granted: 1990-02-27
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Expires: 2008-07-06
Abstract
Abstract A fibrous bone filler having an excellent biocompatibility. The bone filler comprises fibers containing hydroxyl apatite. The hydroxyl apatite is "intact", that is, the hydroxyl apatite substantially retains its hydroxyl groups.
Inventors
- 👤 Shoichi Mori
- 👤 Shigeo Fujii
- 👤 Masao Yoshizawa
- 👤 Kenji Miyasaka
- 👤 Jyoichi Tabuchi
- 👤 Kazufumi Egawa
- 👤 Minoru Hirano
- 👤 Yoshikazu Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:07
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; A; A61; A61F; A61F2/00; A61F2/02; A61F2/28; A61L; A61L27/00; A61L27/02; A61L27/12; A61L27/40; A61L27/44; A61L27/46; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; A61L2430/00; A61L2430/02; Y; Y10; Y10T; Y10T428/00; Y10T428/249921
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
87 words
A method of filling a void in a bond which comprises filling the void with a fibrous bone filler comprising fibers containing intact hydroxyl apatite formed by solution spinning an aqueous suspension comprised of 5 to 70 percent by weight of hydroxyl apatite, 5 to 40 percent by weight of a water-soluble binder and 10 to 90 percent by weight of water, wherein said fibrous bone filler is immersed in an immersion liquid selected from the group consisting of water, physiological saline, chondroitin solution, and hyaluronic solution.
Claim 2
Independent Claim
87 words
A method of filling a void in a bond which comprises filling the void with a fibrous bone filler comprising fibers containing intact hydroxyl apatite formed by solution spinning an aqueous suspension comprised of 5 to 70 percent by weight of hydroxyl apatite, 5 to 40 percent by weight of a water-soluble binder and 10 to 90 percent by weight of water, wherein said fibrous bone filler is immersed in an immersion liquid selected from the group consisting of water, physiological saline, chondroitin solution, and hyaluronic solution.
Claim 3
Dependent Claim
20 words
The method of claim 1, wherein the content of the intact hydroxyl apatite in the fiber is at least 25%.
Claim 4
Dependent Claim
20 words
The method of claim 2, wherein the content of the intact hydroxyl apatite in the fiber is at least 50%.
Claim 5
Dependent Claim
14 words
The method of claim 3, wherein the fiber essentially consists of intact hydroxyl apatite.
Claim 6
Dependent Claim
22 words
The method of claim 1, wherein the bone filler is in the form of a non-woven fabric, cotton, absorbent cotton, or roving.
Claim 7
Dependent Claim
12 words
The method of claim 1, wherein the fiber contains a reinforcing material.
Claim 8
Dependent Claim
15 words
The method of claim 6, wherein the reinforcing material is Ca 3 PO 4 .
Claim 9
Dependent Claim
17 words
The method of claim 1, wherein the diameter of the fiber is about 1 to 30 μm.
Claim 10
Dependent Claim
17 words
The method of claim 8, wherein the diameter of the fiber is about 1 to 30 μm.
Claim 11
Dependent Claim
25 words
The method of claim 1, wherein said immersion liquid is in an amount of from 1 to 20% by weight of said fibrous bone filler.
Claim 12
Dependent Claim
25 words
The method of claim 1, wherein said immersion liquid is in an amount of from 5 to 10% by weight of said fibrous bone filler.
Claim 13
Dependent Claim
51 words
The method of claim 1, wherein said immersion liquid is selected from the group consisting of chondroitin solution and hyaluronic solution, and wherein said immersion liquid is a solution with water as a solvent and with a solute concentration of about from 1 to 20% by weight of said immersion liquid.
Claim 14
Dependent Claim
51 words
The method of claim 11, wherein said immersion liquid is selected from the group consisting of chondroitin solution and hyaluronic solution, and wherein said immersion liquid is a solution with water as a solvent and with a solute concentration of about from 1 to 20% by weight of said immersion liquid.
Claim 15
Dependent Claim
25 words
The method of claim 4, wherein said immersion liquid is in an amount of from 1 to 20% by weight of said fibrous bone filler.
Claim 16
Dependent Claim
25 words
The method of claim 7, wherein said immersion liquid is in an amount of from 1 to 20% by weight of said fibrous bone filler.
Claim 17
Dependent Claim
25 words
The method of claim 9, wherein said immersion liquid is in an amount of from 1 to 20% by weight of said fibrous bone filler.
Claim 18
Dependent Claim
26 words
The method of claim 1, wherein said water-soluble binder is selected from the group consisting of polyvinyl alcohol, carboxymethyl cellulose, hydroxylpropyl cellulose, collagen, pullulan and chitin.
Claim 19
Dependent Claim
11 words
The method of claim 17, wherein said water-soluble binder is pullulan.
Claim 20
Dependent Claim
40 words
The method of claim 1, wherein said aqueous suspension is comprised of 15 to 20 percent by weight of hydroxyl apatite, 20 to 25 percent by weight of a water-soluble binder and 60 to 65 percent by weight of water.
Claim 21
Dependent Claim
40 words
The method of claim 1, wherein said aqueous suspension is comprised of 15 to 30 percent by weight of hydroxyl apatite, 15 to 30 percent by weight of a water-soluble binder and 50 to 70 percent by weight of water.
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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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |