US5980574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial socket, screw for fixing artificial socket and artificial hip joint
Assignee: Pentax Corp
•
Filing: 1997-12-30
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Granted: 1999-11-09
•
Expires: 2017-12-30
Abstract
Abstract An artificial socket comprising a composite body of a calcium phosphate compound and an in vivo-absorptive polymeric material. The artificial socket is embedded and secured in the pelvis side of the artificial hip joint. The socket has a configuration of a semi-spherical shell body, and the thickness thereof is thinner than that of a conventional artificial socket and the inner diameter thereof is substantially the same as that of a real socket in a human bone. An artificial hip joint using the artificial socket and a fixing screw suitable for the fixation of the socket in the pelvis are also disclosed.
Inventors
- 👤 Tunenori Takei
- 👤 Hajime Yamada
- 👤 Satoshi Ojima
- 👤 Masanori Nakasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:05
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/34; A61F2/36; A61F2/3662; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30062; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30784; A61F2002/30787; A61F2/30907; A61F2002/30909; A61F2002/3401; A61F2002/3412; A61F2002/348; A61F2002/3482; A61F2/3609; A61F2002/3611; A61F2002/365; A61F2210/00; A61F2210/0004; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00029; A61F2310/00179; A61F2310/00185; A61F2310/00203; A61F2310/00293
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
33 words
An artificial socket comprising a composite of calcium phosphate compound and in vivo-absorptive polymeric material, said composite being structured and arranged in a form including a hollow portion configured to receive a caput.
Claim 2
Dependent Claim
33 words
An artificial socket comprising a composite of calcium phosphate compound and in vivo-absorptive polymeric material, said composite being structured and arranged in a form including a hollow portion configured to receive a caput.
Claim 3
Dependent Claim
15 words
The artificial socket according to claim 1, wherein said form comprises a semi-spherical shell body.
Claim 4
Dependent Claim
44 words
The artificial socket according to claim 2, wherein said in vivo-absorptive material is at least one member selected from the group consisting of polylactic acid, polyglycolic acid, a mixture of polylactic acid and polyglycolic acid, and a copolymer of lactic acid and glycolic acid.
Claim 5
Dependent Claim
32 words
The artificial socket according to claim 3, wherein said calcium phosphate compound is at least one member selected from the group consisting of hydroxyapatite, fluoroapatite, tricalcium phosphate, tetracalcium phosphate and calcium hydrogenphosphate.
Claim 6
Dependent Claim
31 words
The artificial socket according to claim 4, wherein said in vivo-absorptive polymeric material is contained in an amount of about 5% to 80% by volume based on said calcium phosphate material.
Claim 7
Dependent Claim
33 words
The artificial socket according to claim 4, wherein said semi-spherical shell body has an inner diameter of about 35 mm to 50 mm and a thickness of about 0.5 mm to 7.5 mm.
Claim 8
Dependent Claim
33 words
The artificial socket according to claim 5, wherein said semi-spherical shell body has an inner diameter of about 35 mm to 50 mm and a thickness of about 0.5 mm to 7.5 mm.
Claim 9
Dependent Claim
23 words
The artificial socket according to claim 2, wherein said semi-spherical shell body includes at least one bore insertion through-hole for a fixing screw.
Claim 10
Dependent Claim
21 words
The artificial socket according to claim 8, wherein said semi-spherical shell body includes a mesh structure with a plurality of openings.
Claim 11
Dependent Claim
30 words
The artificial socket according to claim 9, further including a tubular body protruding from an outer surface of said semi-spherical shell body, said tubular body communicating with said insertion through-hole.
Claim 12
Dependent Claim
26 words
The artificial socket according to claim 10, wherein said semi-spherical shell body and said tubular body both have a meshed structure with a plurality of openings.
Claim 13
Dependent Claim
30 words
The artificial socket according to claim 8, further including a tubular body protruding from an outer surface of said semi-spherical shell body, said tubular body communicating with said insertion through-hole.
Claim 14
Dependent Claim
26 words
The artificial socket according to claim 12, wherein said semi-spherical shell body and said tubular body both have a meshed structure with a plurality of openings.
Claim 15
Dependent Claim
33 words
The artificial socket according to claim 3, wherein said semi-spherical shell body has an inner diameter of about 35 mm to 50 mm and a thickness of about 0.5 mm to 7.5 mm.
Claim 16
Dependent Claim
44 words
The artificial socket according to claim 1, wherein said in vivo-absorptive material is at least one member selected from the group consisting of polylactic acid, polyglycolic acid, a mixture of polylactic acid and polyglycolic acid, and a copolymer of lactic acid and glycolic acid.
Claim 17
Dependent Claim
32 words
The artificial socket according to claim 15, wherein said calcium phosphate compound is at least one member selected from the group consisting of hydroxyapatite, fluoroapatite, tricalcium phosphate, tetracalcium phosphate and calcium hydrogenphosphate.
Claim 18
Dependent Claim
31 words
The artificial socket according to claim 16, wherein said in vivo-absorptive polymeric material is contained in an amount of about 5% to 80% by volume based on said calcium phosphate material.
Claim 19
Dependent Claim
32 words
The artificial socket according to claim 1, wherein said calcium phosphate compound is at least one member selected from the group consisting of hydroxyapatite, fluoroapatite, tricalcium phosphate, tetracalcium phosphate and calcium hydrogenphosphate.
Claim 20
Dependent Claim
31 words
The artificial socket according to claim 1, wherein said in vivo-absorptive polymeric material is contained in an amount of about 5% to 80% by volume based on said calcium phosphate material.
Claim 21
Dependent Claim
32 words
The artificial socket according to claim 1, wherein said hollow portion has an inner diameter of about 35 mm to 50 mm and a thickness of about 0.5 mm to 7.5 mm.
Claim 22
Dependent Claim
29 words
In combination, an artificial socket as recited in claim 1, and a fixing screw, said fixing screw comprising a composite of calcium phosphate compound and in vivo-absorptive polymeric material.
Claim 23
Dependent Claim
86 words
A artificial hip joint, comprising: an artificial socket to be embedded and secured in a pelvis; a stem which is to be embedded and secured in an upper end of the femur, said stem including a tip portion including an artificial caput capable of being freely rotatably fitted in said artificial socket; and said artificial socket comprising a composite of calcium phosphate compound and in vivo-absorptive polymeric material, said composite being structured and arranged in a form including a hollow portion configured to receive said caput.
Claim 24
Dependent Claim
86 words
A artificial hip joint, comprising: an artificial socket to be embedded and secured in a pelvis; a stem which is to be embedded and secured in an upper end of the femur, said stem including a tip portion including an artificial caput capable of being freely rotatably fitted in said artificial socket; and said artificial socket comprising a composite of calcium phosphate compound and in vivo-absorptive polymeric material, said composite being structured and arranged in a form including a hollow portion configured to receive said caput.
Claim 25
Dependent Claim
16 words
The artificial hip joint according to claim 22, wherein said form comprises a semi-spherical shell body.
Claim 26
Dependent Claim
37 words
The artificial hip joint according to claim 23, wherein an inner diameter of said semi-spherical shell body and an outer diameter of said artificial caput each is in a range of about 35 mm to 50 mm.
Claim 27
Dependent Claim
23 words
The artificial hip joint according to claim 24, wherein said semi-spherical shell body has a thickness of about 0.5 mm to 7.5 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) | 2002-11-08 | 2003-05-10 | 2003-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-08 | 2007-05-10 | 2007-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-08 | 2011-05-10 | 2011-11-09 | $7700.00 | Window Closed / Lapsed |