Insert for a cotyloid implant cup for a joint prosthesis, cotyloid implant and joint prosthesis
An acetabular implant cup insert for a joint prosthesis, the insert being of the type having a metal shell ( 1 ) and a polymer lining ( 14 ) lining the inside space ( 4 ) of the shell ( 1 ), a receptacle ( 18 ) for a prosthetic head being formed in the lining ( 14 ), the shell presenting on its inside space ( 4 ) elements for preventing the lining ( 14 ) being extracted from the shell ( 1 ) and elements for preventing the lining ( 14 ) turning in the shell ( 1 ), the insert being characterized in that the elements for preventing the lining being extracted include a stud ( 11 ) disposed on the end wall ( 10 ) of the shell ( 1 ) and presenting at least one groove ( 12 ) or lip. An acetabular implant including a cup and an insert of the above type. A joint prosthesis of the type including an acetabular implant of the above type and a prosthetic head.
1. An acetabular implant cup insert for a joint prosthesis, the insert comprising:
a metal shell;
a polymer lining lining an inside space of said shell; and
a receptacle for a prosthetic head being formed in the lining, said shell presenting on said inside space of the shell means for preventing said lining being extracted from the shell and means for preventing the lining turning in the shell,
wherein said means for preventing the lining being extracted comprise a stud disposed on an end wall of a posterior portion of the inside space of the shell,
said stud having at least one groove or lip with which the lining interfits to lock the lining on the shell, and
said stud and said shell are of one piece and integrally formed.
2. The insert according to claim 1 , wherein said means for preventing extraction of said lining include at least one lip.
3. The insert according to claim 1 , wherein said means for preventing said lining being extracted include at least one groove.
4. The insert according to claim 1 , wherein said means for preventing the lining from turning comprise projections formed on the surface of the wall defining the inside space of the shell.
5. The insert according to claim 4 , wherein said projections are ribs extending over all or a fraction of the height of the inside space of the shell.
6. The insert according to claim 1 , wherein said means for preventing the lining from turning comprise depressions formed in the surface of the wall defining the inside space of the shell.
7. The insert according to claim 1 , wherein the anterior portion of said shell presents a conical shape.
8. The insert according to claim 1 , wherein the wall of the receptacle is covered in ceramic.
9. The insert according to claim 1 , wherein said lining is obtained by an operation of thermocompressing said polymer in said inside space of the shell, followed by a machining operation.
10. The insert according to claim 1 , wherein said lining is obtained by prior shaping, and wherein it is put into place by being impacted into the shell.
11. The insert according to claim 1 , wherein said stud is disposed centrally of the shell.
12. The insert according to claim 1 , wherein the insert is a polymer cast within the shell.
13. The insert according to claim 12 , wherein the polymer and the shell have interfitting portions permanently interlocking the cast polymer lining within the shell.
14. An acetabular implant cup insert for a joint prosthesis, the insert comprising:
a metal shell;
a polymer lining lining an inside space of said shell; and
a receptacle for a prosthetic head being formed in the lining, said shell presenting on the inside space of said shell means for preventing said lining being extracted from the shell and means for preventing the lining turning in the shell,
wherein said means for preventing the lining being extracted comprise a stud disposed on an end wall of a posterior portion of the inside space of the shell,
said stud having at least one groove or lip with which the lining interfits to lock the lining on the shell,
said means for preventing extraction of said lining includes at least one lip,
said means for preventing the lining from turning comprise projections formed on the surface of the wall defining the inside space of the shell, and
projections are formed on the lip.
15. An acetabular implant cup insert for a joint prosthesis, the insert comprising:
a metal shell;
a polymer lining lining an inside space of said shell,
a receptacle for a prosthetic head being formed in the lining, said shell presenting on the inside space of said shell means for preventing said lining being extracted from the shell and means for preventing the lining turning in the shell,
wherein said means for preventing the lining being extracted comprise a stud disposed on an end wall of the posterior portion of the inside space of the shell,
said stud having at least one groove or lip with which the lining interfits to lock the lining on the shell,
said means for preventing extraction of said lining includes at least one lip,
said means for preventing the lining from turning comprise depressions formed in the surface of the wall defining the inside space of the shell, and
depressions are formed in the lip.
16. An acetabular implant comprising a cup for being fastened in the pelvis or a shoulder blade of a patient, and an insert lining the inside of said cup in order to receive a prosthetic head, wherein the insert is according to claim 1 .
17. A joint prosthesis comprising an acetabular implant and a prosthetic head, wherein said implant is according to claim 2 .