US6632503B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biodegradable and bioabsorbable implant material and method for adjusting shape thereof
Assignee: Teijin Medical Technologies Co Ltd
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Filing: 1999-09-14
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Granted: 2003-10-14
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Expires: 2019-09-14
Abstract
Abstract This invention provides a biodegradable and bioabsorbable implant material having a high mechanical strength wherein its shape after deformation within ordinary temperature range can be fixed and maintained so that its shape can be easily adjusted at the site of operation, and it has substantially no anisotropy in view of strength so that it does not cause whitening, breakage and sharp decrease in strength when its bending deformation is repeated in any direction and it has toughness. Particularly, it provides an implant material which comprises a biodegradable and bioabsorbable crystalline polymer that has a crystallinity of 5% or more, can effect deformation such as bending or twisting within ordinary temperature range and has a shape-keeping ability to fix and maintain the shape after deformation as such, wherein molecular chains, domains of molecular chain assembly or crystals of the polymer are oriented along a large number of reference axes having different axial directions, or clusters having these reference axes having different orientation are assembled in a large number.
Inventors
- 👤 Yasuo Shikinami
- 👤 Masaki Okuno
- 👤 Hiroshi Morii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:00
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/003; A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/80; A61B17/8085; B29C43/02; B29C43/16; B29K; B29K2995/00; B29K2995/0037; B29K2995/0041; B29K2995/005; B29K2995/0087; B29L; B29L2031/00; B29L2031/753; B29L2031/7532; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A biodegradable and bioabsorbable implant material which comprises a biodegradable and bioabsorbable crystalline polymer capable of effecting deformation within ordinary temperature range and having a shape-keeping ability to fix and maintain the shape after deformation as such, wherein molecular chains, domains of molecular chain assembly or crystals of the biodegradable and bioabsorbable polymer are multi-axially oriented along three-dimensionally oriented reference axes having different axial directions, or clusters having these reference axes having different orientation are assembled.
Claim 2
Dependent Claim
76 words
A biodegradable and bioabsorbable implant material which comprises a biodegradable and bioabsorbable crystalline polymer capable of effecting deformation within ordinary temperature range and having a shape-keeping ability to fix and maintain the shape after deformation as such, wherein molecular chains, domains of molecular chain assembly or crystals of the biodegradable and bioabsorbable polymer are multi-axially oriented along three-dimensionally oriented reference axes having different axial directions, or clusters having these reference axes having different orientation are assembled.
Claim 3
Dependent Claim
44 words
The biodegradable and bioabsorbable implant material according to claim 1 , wherein it is obtained by forging a billet comprising a biodegradable and bioabsorbable crystalline polymer at a low temperature and then forging the same at a low temperature by changing its mechanical direction.
Claim 4
Dependent Claim
23 words
The biodegradable and bioabsorbable implant material according to claim 1 , wherein the biodegradable and bioabsorbable crystalline polymer is a crystalline polylactic acid.
Claim 5
Dependent Claim
20 words
The biodegradable and bioabsorbable implant material according to claim 1 , wherein it is formed into a flat heteromorphic shape.
Claim 6
Dependent Claim
19 words
The biodegradable and bioabsorbable implant material according to claim 1 , wherein it is formed into a cylindrical shape.
Claim 7
Dependent Claim
18 words
The biodegradable and bioabsorbable implant material according to claim 1 , wherein it further comprises a bioceramics powder.
Claim 8
Dependent Claim
40 words
The biodegradable and bioabsorbable implant material according to claim 1 , wherein the state of orientation of molecular chains, domains of molecular chain assembly or crystals of the biodegradable and bioabsorbable polymer partially changes by the deformation within ordinary temperature.
Claim 9
Independent Claim
42 words
A method for adjusting shape of a biodegradable and bioabsorbable implant material, which comprises effecting bending deformation and/or torsional deformation of the biodegradable and bioabsorbable implant material as set forth in any one of claims 1 to 7 within ordinary temperature range.
Claim 10
Dependent Claim
35 words
The biodegradable and bioabsorbable implant material according to claim 4 , wherein the flat heteromorphic shape is a sheet, a plate, a plate having screw-inserting hole(s), a washer, a button, a mesh or a ribbon.
Claim 11
Dependent Claim
25 words
The biodegradable and bioabsorbable implant material according to claim 5 , wherein the cylindrical shape is a wire, a cable, a rod or a pin.
References Cited (Backward Citations)
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) | 2006-10-13 | 2007-04-14 | 2007-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-10-13 | 2011-04-14 | 2011-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-10-13 | 2015-04-14 | 2015-10-14 | $7700.00 | Window Closed / Lapsed |