Patent US4227265A successfully refreshed from Google Patents.
US4227265A
Expired / Lapsed
US
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Bone implant with plastic insert between elements of different mechanical properties
Assignee: Sulzer AG
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Filing: 1978-05-23
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Granted: 1980-10-14
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Expires: 1998-05-23
Abstract
Abstract The bone implant is made from elements which have different mechanical properties and which are maintained out of contact from each other by means of a plastic member. The plastic member is disposed in and fills a gap formed by the implant elements. In addition, the plastic member has thin-walled extensions which are engaged in narrowing sections at the outer boundaries of the gap. These extensions guard against any creep in the plastics member under the forces imposed on the plastics member during stressing of the bone implant.
Inventors
- 👤 Otto Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:56
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3609; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30014; A61F2002/30016; A61F2002/30037; A61F2002/3006; A61F2002/30107; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30354; A61F2002/30433; A61F2002/30474; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/3079; A61F2002/3611; A61F2002/3621; A61F2002/365; A61F2210/00; A61F2210/0009; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2220/0041; A61F2250/00; A61F2250/0014; A61F2250/0018; A61F2250/0019; A61F2250/0026; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00161; A61F2310/00179; F; F16; F16B; F16B2200/00; F16B2200/10; F16B2200/20; F16B2200/205
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
128 words
A bone implant construction comprising a pair of elements of different mechanical properties disposed in relative movable relation, said elements being disposed to transfer loading forces therebetween and to define a shaped predetermined gap therebetween with an abrupt transition to a narrowing section at at least one end of said gap, said section extending at least substantially in the direction of said loading forces; and a resiliently distortable removable plastic member confined in said gap to maintain said elements out of contact with each other, said plastic member having a cylindrical portion to surround one element and a narrowed thin-walled extension coaxial with said cylindrical portion and engaged in said narrowing section to inhibit cold plastic creep of said cylindrical portion from said gap at said one end.
Claim 2
Dependent Claim
128 words
A bone implant construction comprising a pair of elements of different mechanical properties disposed in relative movable relation, said elements being disposed to transfer loading forces therebetween and to define a shaped predetermined gap therebetween with an abrupt transition to a narrowing section at at least one end of said gap, said section extending at least substantially in the direction of said loading forces; and a resiliently distortable removable plastic member confined in said gap to maintain said elements out of contact with each other, said plastic member having a cylindrical portion to surround one element and a narrowed thin-walled extension coaxial with said cylindrical portion and engaged in said narrowing section to inhibit cold plastic creep of said cylindrical portion from said gap at said one end.
Claim 3
Dependent Claim
33 words
A bone implant construction as set forth in claim 1 wherein said elements are disposed to impart a shear force on said plastic member and extend in the plane of said shear force.
Claim 4
Dependent Claim
39 words
A bone implant construction as set forth in claim 1 wherein at least one of said elements has a shoulder directed into said gap in abutment with said plastic member to abruptly narrow said gap at said narrowing section.
Claim 5
Dependent Claim
40 words
A bone implant construction as set forth in claim 1 wherein said elements and said plastic member are sized relative to each other to permit said thin-walled extension to resiliently distort in the direction of said narrowing section under load.
Claim 6
Dependent Claim
31 words
A bone implant construction as set forth in claim 1 wherein one of said elements is made of a bioceramic material and the other of said elements is made of metal.
Claim 7
Dependent Claim
103 words
A bone construction comprising a first element having a stem; a second element having a cavity receiving said stem of said first element in relative movable relation, said second element being spaced from said first element to define a predetermined cup-shaped gap therebetween with a narrowing section at an end of said gap; and a resilient cup-shaped plastic member removably disposed in said gap between said elements to maintain said elements out of contact with each other, said plastic member having a circular cylindrical portion in said gap and a narrowed thin-walled extension coaxial with said cylindrical portion engaged in said narrowing section.
Claim 8
Dependent Claim
103 words
A bone construction comprising a first element having a stem; a second element having a cavity receiving said stem of said first element in relative movable relation, said second element being spaced from said first element to define a predetermined cup-shaped gap therebetween with a narrowing section at an end of said gap; and a resilient cup-shaped plastic member removably disposed in said gap between said elements to maintain said elements out of contact with each other, said plastic member having a circular cylindrical portion in said gap and a narrowed thin-walled extension coaxial with said cylindrical portion engaged in said narrowing section.
Claim 9
Dependent Claim
35 words
A bone implant construction as set forth in claim 6 wherein said stem has a circumferential shoulder projecting outwardly into said gap to abut said plastic member and narrow said gap at said narrowing section.
Claim 10
Dependent Claim
26 words
A bone implant construction as set forth in claim 6 wherein said stem is made of metal and said second element is made of bioceramic material.
Claim 11
Dependent Claim
106 words
A bone implant construction comprising a first element; a second element having a cavity receiving said first element in relative movable relation, said second element being spaced from said first element to define a predetermined annular gap therebetween with a narrowing section at opposite ends of said gap; and an annular resilient plastic member removably disposed in said gap between said elements to maintain said elements out of contact with each other, said plastic member having a circular cylindrical portion to surround said first element and a narrowed thin-walled extension coaxial with and at each end of said cylindrical portion engaged in a respective narrowing section.
Claim 12
Dependent Claim
106 words
A bone implant construction comprising a first element; a second element having a cavity receiving said first element in relative movable relation, said second element being spaced from said first element to define a predetermined annular gap therebetween with a narrowing section at opposite ends of said gap; and an annular resilient plastic member removably disposed in said gap between said elements to maintain said elements out of contact with each other, said plastic member having a circular cylindrical portion to surround said first element and a narrowed thin-walled extension coaxial with and at each end of said cylindrical portion engaged in a respective narrowing section.
Claim 13
Dependent Claim
65 words
A bone implant construction as set forth in claim 9 wherein said first element has a circumferential shoulder projecting outwardly into said gap to abut said plastic member and narrow said gap at one of said narrowing sections and said second element has a circumferential shoulder projecting inwardly into said gap to abut said plastic member and narrow said gap at the opposite narrowing section.
Claim 14
Dependent Claim
30 words
A bone implant construction as set forth in claim 10 wherein one of said elements is made of metal and the other of said elements is made of bioceramic material.
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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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |