Patent US5464440A successfully refreshed from Google Patents.
US5464440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous implant with two sets of pores
Assignee: LuCoCer AB
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Filing: 1992-11-13
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Granted: 1995-11-07
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Expires: 2012-11-13
Abstract
Abstract The present invention relates to an implant made of a porous non-toxic material having a total open porosity exceeding 5% by volume but not exceeding 80% by volume within at least one portion of the implant, which is characterized in that: communicating micropores, having a size of less than or equal to 10 μm, make up not more than 10% of the total pore volume in said at least one portion of the implant; and at least 5% of at least one section of the surface on the implant is covered by substantially evenly distributed pores having a pore size exceeding 50 μm.
Inventors
- 👤 Thomas Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:17
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61L; A61L27/00; A61L27/50; A61L27/56; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30011; A61F2250/00; A61F2250/0014; A61F2250/0023
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
151 words
An implant made of a porous non-toxic material having an outer surface, said porous non-toxic material having a total open porosity exceeding 5% by volume but not exceeding 80% by volume within at least one portion of the implant; said at least one portion having communicating micropores with a size not larger than 10 μm but greater than 0 μm and making up not more than 10% but greater than 0% of the total pore volume in said at least one portion of the implant; at least 5% of at least one section of said surface of the implant being covered by substantially evenly distributed pores having a pore size exceeding 50 μm, said pores existing only in a surface layer of the implant; said micropores together with said pores existing only in said surface layer being completely or partially filled with a substance having a desirable medical or biological function.
Claim 2
Dependent Claim
151 words
An implant made of a porous non-toxic material having an outer surface, said porous non-toxic material having a total open porosity exceeding 5% by volume but not exceeding 80% by volume within at least one portion of the implant; said at least one portion having communicating micropores with a size not larger than 10 μm but greater than 0 μm and making up not more than 10% but greater than 0% of the total pore volume in said at least one portion of the implant; at least 5% of at least one section of said surface of the implant being covered by substantially evenly distributed pores having a pore size exceeding 50 μm, said pores existing only in a surface layer of the implant; said micropores together with said pores existing only in said surface layer being completely or partially filled with a substance having a desirable medical or biological function.
Claim 3
Dependent Claim
16 words
An implant according to claim 1, wherein said micropores have a size less than 5 μm.
Claim 4
Dependent Claim
17 words
An implant according to claim 2, wherein the size of said micropores is less than 2 μm.
Claim 5
Dependent Claim
21 words
An implant according to claim 1, wherein said communicating micropores make up not more than 5% of said total pore volume.
Claim 6
Dependent Claim
32 words
An implant according to claim 1, wherein the surface within said at least one section of the implant is covered by pores having a diameter size in the range of 50-500 μm.
Claim 7
Dependent Claim
29 words
An implant according to claim 1, wherein in a main portion of said at least one section, said pores have a diameter size within the range of 75-400 μm.
Claim 8
Dependent Claim
29 words
An implant according to claim 1, wherein in a main portion of said at least one section, said pores have a diameter size within the range of 100-300 μm.
Claim 9
Dependent Claim
29 words
An implant according to claim 1, wherein in a main portion of said at least one section, said pores have a diameter size within the range of 150-250 μm.
Claim 10
Dependent Claim
16 words
An implant according to claim 1, wherein said surface layer has a thickness of 3 mm.
Claim 11
Dependent Claim
16 words
An implant according to claim 1, wherein said surface layer has a thickness of 2 mm.
Claim 12
Dependent Claim
16 words
An implant according to claim 1, wherein said surface layer has a thickness of 0.3 mm.
Claim 13
Dependent Claim
36 words
An implant according to claim 1, wherein said at least one portion of the implant is made of a material selected from the group consisting of calcium phosphate materials, titanium, cobalt-chromium-alloys, stainless steel, ceramics and polymers.
Claim 14
Dependent Claim
12 words
An implant according to claim 12, wherein said ceramic is silicon nitride.
Claim 15
Dependent Claim
21 words
An implant according to claim 1, wherein said substance having a desirable medical or biological function is a bone ingrowth-promoting agent.
Claim 16
Dependent Claim
31 words
An implant according to claim 14, wherein said bone ingrowth promoting agent is selected from the group consisting of insulin-like growth factor, platelet-derived growth factor, bone-morphogenetic protein, and transforming growth factor.
Claim 17
Dependent Claim
19 words
An implant according to claim 1, wherein said substance having a desirable medical or biological function is an antibiotic.
Claim 18
Dependent Claim
24 words
An implant according to claim 1, wherein said substance having a desirable medical or biological function is a calcium phosphate compound or a fluoride.
Claim 19
Dependent Claim
19 words
An implant according to claim 1, wherein said substance having a desirable medical or biological function is hyaluronic acid.
Claim 20
Dependent Claim
25 words
An implant according to claim 1, wherein said substance having a desirable medical or biological function is in a hydrogel, or in a polymer carrier.
Claim 21
Dependent Claim
33 words
An implant according to claim 1, wherein said substance having a desirable medical or biological function is differentially deposited in different zones in order to control bone growth rate and bone tissue quality.
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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) | 1998-11-06 | 1999-05-08 | 1999-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-06 | 2003-05-08 | 2003-11-07 | $3760.00 | Window Closed / Lapsed |
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