US4898186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Osteosynthetic pin
Assignee: Gunze Ltd
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Filing: 1987-09-11
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Granted: 1990-02-06
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Expires: 2007-09-11
Abstract
Abstract PCT No. PCT/JP87/00673 Sec. 371 Date Apr. 29, 1988 Sec. 102(e) Date Apr. 29, 1988 PCT Filed Sep. 11, 1987 PCT Pub. No. WO88/01849 PCT Pub. Date Mar. 24, 1988.An osteosynthetic pin characterized in that the pin is formed substantially of a poly-L-lactic acid having a molecular weight of at least about 70,000, and is formed by axially drawing about 2 to about 10 times at an elevated temperature of about 70 DEG to about 120 DEG C.
Inventors
- 👤 Yoshito Ikada
- 👤 Hyu H. Suong
- 👤 Yoshihiko Shimizu
- 👤 Satoshi Watanabe
- 👤 Tatsuo Nakamura
- 👤 Masakazu Suzuki
- 👤 Takeshi Shimamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:31
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61L; A61L31/00; A61L31/04; A61L31/06; A61B2017/00004; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2002/30001; A61F2002/30108; A61F2002/30199; A61F2002/30205; A61F2002/30207; A61F2230/00; A61F2230/0063; A61F2230/0067; Y; Y10; Y10S; Y10S623/00; Y10S623/909; Y10S623/911
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
41 words
An osteosynthetic pin obtained by shaping a poly-L-lactic acid having a molecular weight of at least about 70,000 and axially drawing the shaped body about 2 to about 10 times at an elevated temperature of about 70° to about 120° C.
Claim 2
Dependent Claim
41 words
An osteosynthetic pin obtained by shaping a poly-L-lactic acid having a molecular weight of at least about 70,000 and axially drawing the shaped body about 2 to about 10 times at an elevated temperature of about 70° to about 120° C.
Claim 3
Dependent Claim
21 words
An osteosynthetic pin as defined in claim 1 wherein the poly-L-lactic acid has a molecular weight of at least about 100,000.
Claim 4
Dependent Claim
27 words
An osteosynthetic pin as defined in claim 1 wherein the poly-L-lactic acid contains about 1 to about 15 wt % of hydroxyapatite admixed with the poly-L-lactic acid.
Claim 5
Dependent Claim
25 words
An osteosynthetic pin as defined in claim 3 wherein the content of hydroxyapatite is in the range of about 5 to about 10 wt %.
Claim 6
Dependent Claim
19 words
An osteosynthetic pin as defined in claim 1 or 3 further comprising a bore extending axially through the pin.
Claim 7
Dependent Claim
44 words
A process for preparing an osteosynthetic pin, omprising: shaping a poly-L-lactic acid having a molecular weight of at least about 70,000 and axially drawing the shaped body about 2 to about 10 times at an elevated temperature of about 70° to about 20° C.
Claim 8
Dependent Claim
44 words
A process for preparing an osteosynthetic pin, omprising: shaping a poly-L-lactic acid having a molecular weight of at least about 70,000 and axially drawing the shaped body about 2 to about 10 times at an elevated temperature of about 70° to about 20° C.
References Cited (Backward Citations)
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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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |