US4957819A
Expired / Lapsed
US
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Frameless and coreless porous endosseous implant
Assignee: HARUYUKI KAWAHARA 28 TOKO-CHO 1-CHOME MORIGUCHI-SHI OSAKA JAPAN
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Filing: 1989-05-30
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Granted: 1990-09-18
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Expires: 2009-05-30
Abstract
Abstract A frameless and coreless porous endosseous implant comprising a porous sintered metal layer (2) having a range of relatively large pores and porous sintered metal layers having a range of relatively small pores and laminated into one body by sintering integrally with the layer on either side thereof, or a porous singered metal layer having a range of relatively small pores and porous sintered metal layers having a range of relatively large pores and laminated into one body by sintering integrally with the layer on either side thereof, whereby the three layers each permit the ingrowth and penetration out of two or more kinds out of fibrous tissue, osteoid tissue and bone tissue in the pores thereof.
Inventors
- 👤 Haruyuki Kawahara
- 👤 Seiichi Tsukamoto
- 👤 Yutaka Nomura
- 👤 Katsumi Tanaka
- 👤 Yasuyuki Ashiura
- 👤 Motonobu Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:21
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/50; A61L27/56; A61C; A61C8/00; A61C8/0012; A61F; A61F2/00; A61F2/02; A61F2/28; A61F2/30; A61F2/30767; A61F2/32; A61F2/36; A61F2/3662; A61L27/02; A61L27/04; A61C8/0018; A61C8/0037; A61C2008/0046; A61C8/0039; A61F2/3094; A61F2002/30968; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12021; Y10T428/12028; Y10T428/12042; Y10T428/12153; Y10T428/12458
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
A frameless and coreless porous endosseous implant comprising a porous sintered metal layer (2) having a range of relatively large pores and porous sintered metal layers (1) and (1) each having a range of relatively small pores and laminated into one body by sintering integrally with the layer (2) of relatively large pores on either side thereof, whereby said three layers (1), (2), and (1) each permit the ingrowth and penetration of two or more kinds of tissue selected from the group consisting of fibrous tissue, osteoid tissue and bone tissue in the pores thereof, said large pores having a mean size range of of 50-200 μm.
Claim 2
Dependent Claim
107 words
A frameless and coreless porous endosseous implant comprising a porous sintered metal layer (2) having a range of relatively large pores and porous sintered metal layers (1) and (1) each having a range of relatively small pores and laminated into one body by sintering integrally with the layer (2) of relatively large pores on either side thereof, whereby said three layers (1), (2), and (1) each permit the ingrowth and penetration of two or more kinds of tissue selected from the group consisting of fibrous tissue, osteoid tissue and bone tissue in the pores thereof, said large pores having a mean size range of of 50-200 μm.
Claim 3
Dependent Claim
103 words
A frameless and coreless porous endosseous implant comprising a porous sintered metal layer (1) having a range of relatively small pores and porous sintered metal layers (2) and (2) each having a range of relatively large pores and laminated into one body by sintering integrally with the layer (1) on either side thereof, whereby said three layers (2), (1), and (2) each permit the ingrowth and penetration of two or more kinds of tissues selected from the group consisting of fibrous tissue, osteoid tissue and bone tissue in the pores thereof, said large pores having a mean size range of of 50-200 μm.
Claim 4
Dependent Claim
103 words
A frameless and coreless porous endosseous implant comprising a porous sintered metal layer (1) having a range of relatively small pores and porous sintered metal layers (2) and (2) each having a range of relatively large pores and laminated into one body by sintering integrally with the layer (1) on either side thereof, whereby said three layers (2), (1), and (2) each permit the ingrowth and penetration of two or more kinds of tissues selected from the group consisting of fibrous tissue, osteoid tissue and bone tissue in the pores thereof, said large pores having a mean size range of of 50-200 μm.
Claim 5
Dependent Claim
47 words
An endosseous implant according to claim 1 or 2 wherein the range of the porous sintered metal layer (1) having a range of relatively small pores is 50 μm or less on an average and the porosity of the layer is 30% or more on an average.
Claim 6
Dependent Claim
30 words
An endosseous implant according to claim 1 wherein coarse tubular channels 3 passing transversely through the respective thickness of the implant are formed in a desired range of distribution thereover.
Claim 7
Dependent Claim
23 words
An endosseous implant according to claim 4 wherein said tubular channels 3 are in the range of 200 to 1000 μm in diameter.
Claim 8
Dependent Claim
36 words
An endosseous implant according to claim 4 or 5 wherein said tubular channels (3) are formed by a method selected from the group consisting of electrobeam method, laser beam method, electrospark method and mechanical drilling method.
References Cited (Backward Citations)
US2267918A
Cited
US2464517A
Cited
US3808606A
Cited
US3905777A
Cited
US4017911A
Cited
US4374669A
Cited
US4073999A
Cited
US4156943A
Cited
US4309488A
Cited
US4357393A
Cited
US4599085A
Cited
US4644942A
Cited
US4447209A
Cited
US4671768A
Cited
US4723913A
Cited
US4855101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |