US5531794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic device providing an environment for the promotion and formation of new bone
Assignee: Pentax Corp
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Filing: 1994-09-13
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Granted: 1996-07-02
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Expires: 2014-09-13
Abstract
Abstract A ceramic device providing an environment for the promotion and formation of new bone. The ceramic device is made of a sinter of calcium phosphate compound, containing a plurality of perfect spherical pores whose diameter ranges from 10-450 μm to provide a suitable environment for the formation of new bone. A plurality of micro pores is included whose diameter ranges from 0.01-0.5 μm which surrounds the perfect spherical pores to interconnect the perfect spherical pores with an outer surface of the ceramic device with the micro pores interconnecting with each other.
Inventors
- 👤 Shigehide Takagi
- 👤 Kuniomi Ito
- 👤 Tsuneo Hidaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:42
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/28; A61L; A61L27/00; A61L27/02; A61L27/12; A61L27/50; A61L27/56; A61F2/30; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30011; A61F2002/30108; A61F2002/30199; A61F2002/30224; A61F2002/30261; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30784; A61F2002/30785; A61F2/3094; A61F2002/30968; A61F2230/00; A61F2230/0063; A61F2230/0069; A61F2230/0082; A61F2250/00; A61F2250/0014; A61F2250/0023; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A ceramic device providing an environment for promotion and formation of new bone, wherein said ceramic device is made of a sinter of calcium phosphate compound, containing a plurality of perfect spherical pores whose diameters are in a ranger of 10-450 μm to provide said environment for formation of a new bone, and a plurality of micro pores whose diameters are in a range 0.01-0.5 μm, which surround said perfect spherical pores to connect said perfect spherical pores with an outer surface of said ceramic device, wherein said micro pores interconnect with each other.
Claim 2
Dependent Claim
94 words
A ceramic device providing an environment for promotion and formation of new bone, wherein said ceramic device is made of a sinter of calcium phosphate compound, containing a plurality of perfect spherical pores whose diameters are in a ranger of 10-450 μm to provide said environment for formation of a new bone, and a plurality of micro pores whose diameters are in a range 0.01-0.5 μm, which surround said perfect spherical pores to connect said perfect spherical pores with an outer surface of said ceramic device, wherein said micro pores interconnect with each other.
Claim 3
Dependent Claim
34 words
A ceramic device according to claim 1, wherein said ceramic device further comprises: at least one pair of opposed surfaces; and at least one tubular passage of 0.6-1.2 mm diameter connecting said opposed surfaces.
Claim 4
Dependent Claim
42 words
A ceramic device according to claim 2, wherein a plurality of said tubular passages are provided so as to be spaced at a distance of 3-5 mm between each other in a cross section normal to a direction of said tubular passages.
Claim 5
Dependent Claim
58 words
A ceramic device according to claim 2, wherein said ceramic device is in a form of a rectangular shaped column, and wherein a first of said at least one tubular passage is provided at a center of said rectangular shaped column, and other said tubular passages are arranged around said center tubular passage in a hexagonally symmetrical manner.
Claim 6
Dependent Claim
52 words
A ceramic device according to claim 3, wherein said tubular passages include at least one central passage located at a center of a circle within said cross section normal to said direction of said tubular passages, and a plurality of peripheral passages located equidistantly from one another and from said central passage.
Claim 7
Dependent Claim
27 words
A ceramic device according to claim 5, wherein a diameter of said circle is substantially 1 cm, and said equi-distance is in a range of 3-5 mm.
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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) | 1999-07-02 | 2000-01-01 | 2000-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-02 | 2004-01-01 | 2004-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-02 | 2008-01-01 | 2008-07-02 | $7700.00 | Window Closed / Lapsed |