US4058856A
Expired / Lapsed
US
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Joint endoprosthesis
Assignee: Sulzer AG
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Filing: 1976-10-12
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Granted: 1977-11-22
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Expires: 1996-10-12
Abstract
Abstract The metal male joint part has a taper which is less than that of the cavity of the oxide ceramic female joint part. In addition, the surface of the male part has a resistance to deformation which is less than that of the core of the male part. The cone angle β of the female cavity and the cone angle α of the male joint part are in the relation: tan β/2 - 0.001 ≦ tan α/2 ≦ tan β/2 - 0.005.
Inventors
- 👤 Erhard Doerre
- 👤 Manfred Semlitsch
- 👤 Otto Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:48
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; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30349; A61F2002/30476; A61F2002/30485; A61F2002/30535; A61F2002/30593; A61F2/30767; A61F2/30771; A61F2002/3082; A61F2002/30827; A61F2002/3611; A61F2002/365; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2250/00; A61F2250/0014; A61F2250/0018; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00179; A61F2310/00185
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
4 words
A joint endoprosthesis comprising
Claim 2
Dependent Claim
4 words
A joint endoprosthesis comprising
Claim 3
Dependent Claim
79 words
a female joint part of oxide ceramic material having a cone-shaped cavity, said cavity having a taper of from 1:20 to 1:10; and a male joint part of metal material secured in said female joint part in self-locking relation, said male joint part having a core and a surface layer about said core disposed on a taper smaller than said taper of said cavity and having a resistance to deformation less than the resistance to deformation of said core.
Claim 4
Dependent Claim
79 words
a female joint part of oxide ceramic material having a cone-shaped cavity, said cavity having a taper of from 1:20 to 1:10; and a male joint part of metal material secured in said female joint part in self-locking relation, said male joint part having a core and a surface layer about said core disposed on a taper smaller than said taper of said cavity and having a resistance to deformation less than the resistance to deformation of said core.
Claim 5
Dependent Claim
35 words
A joint endoprosthesis as set forth in claim 1 wherein said surface layer is of decreasing thickness in a direction axially away from an end of said male joint part within said female joint part.
Claim 6
Dependent Claim
29 words
A joint endoprosthesis as set forth in claim 2 wherein said surface layer decreases in thickness at an angle at least equal to the cone angle of said cavity.
Claim 7
Dependent Claim
31 words
A joint endoprosthesis as set forth in claim 1 wherein said cavity of said female joint part has a surface of an arithmetic mean roughness value between 0.5 and 3 microns.
Claim 8
Dependent Claim
35 words
A joint endoprosthesis as set forth in claim 4 wherein said cavity surface has a plurality of corrugated grooves therein of a corrugation length between 1 and 3 millimeters and a depth of 0.02 millimeters.
Claim 9
Dependent Claim
39 words
A joint endoprosthesis as set forth in claim 1 wherein said cavity has a cone angle (β) and said male joint part has a cone angle (α) and wherein tan β/2 - 0.001 ≦ tan α/2 ≦tanβ/2 - 0.005.
Claim 10
Dependent Claim
76 words
A joint endoprosthesis as set forth in claim 1 wherein said cavity has a cone angle (β) and said male joint part has a cone angle (α) and wherein said surface layer is of decreasing thickness in a direction axially away from an end of said male joint part within said female joint part at an angle γ at least equal to the cone angle of said cavity and wherein β ≦ γ ≦ 1.15 β.
Claim 11
Dependent Claim
63 words
A joint endoprosthesis as set forth in claim 1 wherein said surface layer includes grooves in the form of a screwthread and circumferentially extending projections alternately between said grooves, said grooves being of decreasing depth in a direction axially away from an end of said male joint part within said female joint part and said projections being of increasing width in said direction.
Claim 12
Dependent Claim
18 words
A joint endoprosthesis as set forth in claim 1 wherein said male joint part has a hollow core.
Claim 13
Dependent Claim
74 words
A joint endoprosthesis comprising a female joint part of oxide ceramic material having a cone shaped cavity; and a male joint part of metal material secured in said female joint part in self-locking relation, said male joint part having a core and a surface layer about said core disposed on a taper smaller than said taper of said cavity and having a resistance to deformation less than the resistance to deformation of said core.
Claim 14
Dependent Claim
74 words
A joint endoprosthesis comprising a female joint part of oxide ceramic material having a cone shaped cavity; and a male joint part of metal material secured in said female joint part in self-locking relation, said male joint part having a core and a surface layer about said core disposed on a taper smaller than said taper of said cavity and having a resistance to deformation less than the resistance to deformation of said core.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |