Artificial hip joint

Abstract

An artificial hip joint having an acetabulum prosthesis for the cotyloid cavity defining a socket and including a head having a plurality of blades extending outwardly away from the socket for engaging the prepared wall of the cotyloid cavity and having at least one insert removably connected to the head to form the socket. A prosthesis of the head of the femur is movably interconnected with the acetabulum prosthesis and includes a pin to be driven into the bone-marrow channel of the femur, a curved neck integral with the pin, and a hip ball positioned on the neck, movably located within the socket and in movable contact with the removable insert. Means are provided in operative relationship with the femur head prosthesis for preventing rotation of the femur head prosthesis with respect to the femur.

What is claimed is: 
     
       1. An artificial hip joint, comprising: an acetabulum prosthesis of the cotyloid cavity defining an aperture having screw threads on the inner surface thereof and a plurality of blades extending outwardly away from said aperture for engaging the prepared wall of the cotyloid cavity;   at least one insert having an outer threaded surface and an inner bearing surface inserted into said aperture and threadedly connected by means of said threads to said acetabulum prosthesis to form a socket, the outer surface of said at least one insert engaging and being supported by the inner surface of said aperture; and   a prosthesis of the head of the femur movably interconnected with said acetabulum prosthesis and including a pin to be driven into the bone-marrow channel of the femur, a .[.curved.]. neck integral with the pin, and a hip ball positioned on the neck, movably located within said socket and in movable contact with said insert, said socket enveloping more than one-half of the hip ball to prevent withdrawal of the hip ball from the socket, said artificial hip joint composed of surgical grade materials suitable for implantation into the body.   
     
     
       2. An artificial hip joint as in claim 1 wherein said insert is comprised of plastic. 
     
     
       3. An artificial hip joint as in claim 1 wherein said acetabulum prosthesis includes two of said inserts. 
     
     
       4. An artificial hip joint as in claim 1 wherein said insert is comprised of ultra high molecular weight polyethylene. 
     
     
       5. An artificial hip joint as in claim 4 wherein said hip ball is comprised of titanium or a titanium alloy. 
     
     
       6. An artificial hip joint as in claim 1 wherein said insert is comprised of cobalt alloy ASTM F75-67. 
     
     
       7. An artificial hip joint as in claim 1 wherein said hip ball is comprised of cobalt alloy. 
     
     
       8. An artificial hip joint as in claim 1 wherein all of said acetabulum prosthesis but the insert and all of the prosthesis of the head of the femur but the hip ball are comprised of titanium or a titanium alloy. 
     
     
       9. An artificial hip joint as in claim 8 wherein the titanium alloy is ASTM F136-70. 
     
     
       10. An artificial hip joint as in claim 8 wherein the titanium is ASTM F67-66. 
     
     
       11. An artificial hip joint as in claim 1 wherein said insert includes an integral threaded ring portion for threadedly engaging grooves in said acetabulum prosthesis. 
     
     
       12. An artificial hip joint as in claim 11 wherein said insert further defines notches adjacent said threaded ring for enabling said insert to be screwed into position with said ring threadedly engaging said grooves. 
     
     
       13. An artificial hip joint as in claim 1 wherein said insert is formed as one unitary piece. 
     
     
       14. An artificial hip joint comprising: an acetabulum prosthesis of the cotyloid cavity defining an aperture having screw threads on the inner surface thereof;   at least one insert having an outer threaded surface and an inner bearing surface inserted into said aperture and threadedly connected by means of said threads to said acetabulum prosthesis to form a socket, the outer surface of said at least one inert engaging and being supported by the inner surface of said aperture; and   a prosthesis of the head of the femur movably interconnected with said acetabulum prosthesis and including a pin to be driven into the bone-marrow channel of the femur, a .[.curved.]. neck integral with the pin, and a hip ball positioned on the neck, movably located within said socket and in movable contact with said insert, said socket enveloping more than one-half of the hip ball to prevent withdrawal of the hip ball from the socket, said artificial hip joint composed of surgical grade materials suitable for implantation into the body.   
     
     
       15. An artificial hip joint as in claim 14 wherein said insert includes an integral threaded ring portion for threadedly engaging said acetabulum prosthesis threads. 
     
     
       16. An artificial hip joint as in claim 15 wherein said insert further defines notches adjacent to said threaded ring for enabling said insert to be screwed into position with said ring threadedly engaging said threads. 
     
     
       17. An artificial hip joint as in claim 14 wherein said insert socket defines more than a hemisphere. 
     
     
       18. An artificial hip joint as in claim 14 wherein said insert is formed as one unitary piece. 
     
     
       19. An artificial hip joint as in claim 18 wherein said insert is comprised of plastic. 
     
     
       20. An artificial hip joint as in claim 19 wherein said plastic is ultra high molecular weight polyethylene. 
     
     
       21. An artificial hip joint as in claim 14 wherein said insert is formed as two pieces. 
     
     
       22. An artificial hip joint as in claim 21 wherein said insert is comprised of cobalt alloy. 
     
     
       23. An artificial hip joint as in claim 22 wherein said cobalt alloy is ASTM F75-67. 
     
     
       24. An artificial hip joint as in claim 14 further including means in operative relationship with said femur head prosthesis for preventing rotation of the femur head prosthesis with respect to the femur.