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US5986169A
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Porous nickel-titanium alloy article
Assignee: TOMSK MEDICAL ENGINEERING CENTRE OF SHAPE MEMORY IMPLANT
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Filing: 1997-12-31
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Granted: 1999-11-16
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Expires: 2017-12-31
Abstract
Abstract A porous article of a nickel-titanium alloy, said article having a porosity of 8 to 90% and said porosity being defined by a network of interconnected passageways extending throughout said member, said network exhibiting a permeability of fluid material effective to permit complete migration of the fluid material throughout said network, said permeability being isotropic, and said member being elastically deformable; the porous article is useful as a biomedical implant and in other non-medical applications including the working element of cryogenic surgical instruments.
Inventors
- 👤 Victor Gjunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:16
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/1143; A; A61; A61L; A61L27/00; A61L27/02; A61L27/04; A61L27/06; A61L27/50; A61L27/56; B22F2999/00; Y; Y10; Y10S; Y10S623/00; Y10S623/924
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
108 words
A porous article having a porous sintered powder body based on a nickel-titanium alloy, said article having a porosity of 8 to 90% and said porosity being defined by a network of interconnected passageways extending throughout said sintered powdered body, said network exhibiting a permeability for fluid material effective to permit complete migration of the fluid material throughout said network, said permeability arising from capilliarity in said network and said network having a distribution of pores as follows: ______________________________________
Pore Size in Microns
Quantity
______________________________________
10.sup.-2 -10.sup.-1
1-15%
10.sup.1 -10 5-10%
10-100 10-20%
100-400 20-50%
400-1000 10-50%
above 1000 remainder to 100%,
______________________________________ said article being elastically deformable.
Claim 2
Dependent Claim
108 words
A porous article having a porous sintered powder body based on a nickel-titanium alloy, said article having a porosity of 8 to 90% and said porosity being defined by a network of interconnected passageways extending throughout said sintered powdered body, said network exhibiting a permeability for fluid material effective to permit complete migration of the fluid material throughout said network, said permeability arising from capilliarity in said network and said network having a distribution of pores as follows: ______________________________________
Pore Size in Microns
Quantity
______________________________________
10.sup.-2 -10.sup.-1
1-15%
10.sup.1 -10 5-10%
10-100 10-20%
100-400 20-50%
400-1000 10-50%
above 1000 remainder to 100%,
______________________________________ said article being elastically deformable.
Claim 3
Dependent Claim
14 words
A porous article according to claim 1, wherein said alloy is a biocompatible alloy.
Claim 4
Dependent Claim
34 words
A porous article according to claim 2, wherein said network is permeable to biological tissue in a biological fluid, and said network comprises pores of a size to permit growth of biological tissue therein.
Claim 5
Dependent Claim
14 words
A porous article according to claim 3, having a porosity of at least 40%.
Claim 6
Dependent Claim
15 words
A porous article according to claim 4, having a porosity of not more than 80%.
Claim 7
Dependent Claim
19 words
A porous article according to claim 5, having a coefficient of permeability of 2×10 --- to 2×10 -5 .
Claim 8
Dependent Claim
29 words
A porous article according to claim 1, wherein said alloy comprises 2 to 98%, by weight, titanium and 98 to 2%, by weight, nickel, to a total of 100%.
Claim 9
Dependent Claim
29 words
A porous article according to claim 6, wherein said alloy comprises 40 to 60%, by weight, titanium and 60 to 40%, by weight, nickel to a total of 100%.
Claim 10
Dependent Claim
14 words
A porous article according to claim 1, in the form of a biomedical implant.
Claim 11
Dependent Claim
14 words
A porous article according to claim 8, in the form of a biomedical implant.
Claim 12
Dependent Claim
12 words
A porous article according to claim 1, wherein said permeability is isotropic.
Claim 13
Dependent Claim
29 words
A porous article according to claim 1, wherein said alloy comprises 40 to 60%, by weight, titanium and 60 to 40%, by weight, nickel, to a total of 100%.
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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) | 2002-11-15 | 2003-05-17 | 2003-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-15 | 2007-05-17 | 2007-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-15 | 2011-05-17 | 2011-11-16 | $7700.00 | Window Closed / Lapsed |