US4878916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic cupule
Assignee: Individual
•
Filing: 1989-01-19
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Granted: 1989-11-07
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Expires: 2009-01-19
Abstract
Abstract Prosthetic cupule comprising: a metallic support cupule (6), a friction cupule in plastic material (20), of which the external shape corresponds to the internal shape of the support cupule, characterized in that: the support cupule (6) is provided in its center with an opening (14); the external shape of the friction cupule (20) comprises respectively a first cylindrical portion (22), joining up with a truncated portion (23), which is itself joined with a flat portion (25) provided in its center with a cylindrical central lug (24); and in that the internal face (21) of the friction cupule (6) is semi-spherical.
Inventors
- 👤 Jean-Luc Rhenter
- 👤 Jean Collomb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:01
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/34; A61F2/36; A61F2/3609; B; B23; B23P; B23P11/00; B23P11/02; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61F2002/30001; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30339; A61F2002/30345; A61F2002/30354; A61F2002/30433; A61F2002/30535; A61F2002/30604; A61F2/30767; A61F2/30771; A61F2002/30795; A61F2002/30797; A61F2002/3082; A61F2002/30827; A61F2002/3085; A61F2002/30858; A61F2002/3412; A61F2002/3414; A61F2002/3611; A61F2002/3625; A61F2002/365; A61F2002/3652; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2220/0041; A61F2250/00; A61F2250/0014; A61F2250/0026; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
174 words
A prosthesis cupule, comprising: a metallic support cupule for fixing to a bone, and a friction cupule of plastic material having an internal surface in the form of a concave approximate semi-sphere to fit over a spherical head of a pin, an axis of said semi-spherical surface being normal to the central plane defining the extent of the approximately semi-spherical surface, and an external surface comprising at least one surface parallel to said axis, the coefficient of expansion of the plastic material constituting the friction cupule is at 20° C. sufficiently greater than that of the metal constituting the support cupule, so that the expanded friction cupule is compressed and tightly held within the support cupule at body temperature, that is at about 37° C., said metallic support cupule having an internal cavity for receiving the external face of the friction cupule; and wherein at body temperature, said friction cupule expands and is compressed against said internal cavity and tightly held therein, thereby providing the sole engagement between said friction and metallic support cupules.
Claim 2
Dependent Claim
174 words
A prosthesis cupule, comprising: a metallic support cupule for fixing to a bone, and a friction cupule of plastic material having an internal surface in the form of a concave approximate semi-sphere to fit over a spherical head of a pin, an axis of said semi-spherical surface being normal to the central plane defining the extent of the approximately semi-spherical surface, and an external surface comprising at least one surface parallel to said axis, the coefficient of expansion of the plastic material constituting the friction cupule is at 20° C. sufficiently greater than that of the metal constituting the support cupule, so that the expanded friction cupule is compressed and tightly held within the support cupule at body temperature, that is at about 37° C., said metallic support cupule having an internal cavity for receiving the external face of the friction cupule; and wherein at body temperature, said friction cupule expands and is compressed against said internal cavity and tightly held therein, thereby providing the sole engagement between said friction and metallic support cupules.
Claim 3
Dependent Claim
67 words
A prosthesis cupule according to claim 1, wherein the friction cupule comprises a central lug portion adapted to fit in a traversing cylindrical portion provided in said metallic support, said axis of the semispherical surface of said friction cupule normal to the central plane defining the extent of the approximately semi-spherical surface passing through said lug, said lug having at least one surface parallel to said axis.
Claim 4
Dependent Claim
24 words
A prosthesis cupule according to claim 1, wherein the support cupule is titanium or titanium alloy and the friction cupule is high density polyethylene.
Claim 5
Dependent Claim
38 words
A prosthesis cupule according to claim 1, wherein the coefficient of expansion of the plastic material to the friction cupule is, at 20° C., at least twenty times higher than that of the metal of the support cupule.
Claim 6
Dependent Claim
33 words
A friction cupule according to claim 1, wherein the friction cupule is compressed by the support cupule in an amount in the range of about 0.005 to about 0.07 mm at body temperature.
Claim 7
Independent Claim
235 words
A method of interconnecting a friction cupule and metallic support cupule to form a prosthesis cupule, comprising: providing a friction cupule of plastic material having an internal surface in the form of a concave approximate semi-sphere to fit over a spherical head of a pin, an axis of said semi-spherical surface being normal to the central plane defining the extent of the approximately semi-spherical surface, and an external surface comprising at least one surface parallel to said axis; a metallic support cupule, for fixing to a bone, said metallic cupule having an internal cavity for receiving the external face of the friction cupule, an internal shape of the cavity of the metallic support cupule being exactly complementary to the shape of the external face of the friction cupule at 0° C. so that said uncompressed friction cupule is freely rotatable within the metallic cupule, the coefficient of expansion of the plastic material constituting the friction cupule being, at 20° C., greater than that of the metal constituting the support cupule; and fitting the friction cupule with the metallic support cupule by cooling the friction cupule to a temperature such that the friction cupule is slidably received in the metallic support cupule, and allowing the temperature of the friction cupule to increase such that the friction cupule is securely held in the support cupule, thereby providing the sole engagement between said friction and metallic support cupules.
Claim 8
Independent Claim
235 words
A method of interconnecting a friction cupule and metallic support cupule to form a prosthesis cupule, comprising: providing a friction cupule of plastic material having an internal surface in the form of a concave approximate semi-sphere to fit over a spherical head of a pin, an axis of said semi-spherical surface being normal to the central plane defining the extent of the approximately semi-spherical surface, and an external surface comprising at least one surface parallel to said axis; a metallic support cupule, for fixing to a bone, said metallic cupule having an internal cavity for receiving the external face of the friction cupule, an internal shape of the cavity of the metallic support cupule being exactly complementary to the shape of the external face of the friction cupule at 0° C. so that said uncompressed friction cupule is freely rotatable within the metallic cupule, the coefficient of expansion of the plastic material constituting the friction cupule being, at 20° C., greater than that of the metal constituting the support cupule; and fitting the friction cupule with the metallic support cupule by cooling the friction cupule to a temperature such that the friction cupule is slidably received in the metallic support cupule, and allowing the temperature of the friction cupule to increase such that the friction cupule is securely held in the support cupule, thereby providing the sole engagement between said friction and metallic support cupules.
Claim 9
Dependent Claim
22 words
The method of claim 6, wherein the support cupule is titanium or titanium alloy and the friction cupule is high density polyethylene.
Claim 10
Dependent Claim
26 words
The method of claim 6, wherein the friction cupule is compressed an amount in the range of about 0.005 to about 0.07 mm at body temperature.
Claim 11
Dependent Claim
36 words
The method of claim 6, wherein the coefficient of expansion of the plastic material of the friction cupule is, at 20° C., at least twenty times higher than that of the metal of the support cupule.
References Cited (Backward Citations)
FR2297030A1
Cited
FR2493139A1
Cited
EP0091315A1
Cited
EP0139356A1
Cited
US4715860A
Cited
US4695282A
Cited
US4704127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |