Patent ID: 6811568
Filing Date: 2004-11-02
Classification: A61F

Abstract:
An artificial joint comprising:a head (2) having a spherical convex surface at one end and a first fitting piece (3) with a quadrangular configuration in cross section at the other end; a socket (5) having a spherical concave surface (6) at one end and a second fitting piece (7) with a quadrangular configuration in cross section at the other end, said head (2) and said socket (5) being interconnected so that said spherical convex and concave surfaces slidably contacts with each other; a first stem (9) having at one end a first stem base portion (10) provided with a first fitting hole (12) having a quadrangular configuration in cross section and a first threaded hole (13) and at the other end a first pair of stem pieces (15) which extend from the first stem base portion (16) and are spaced substantially in parallel with each other, said first fitting piece (3) of said head (2) being engaged with said first fitting hole (12); a second stem (16) having at one end a second stem base portion (10) provided with a second fitting hole (12) having a quadrangular configuration in cross section and a second threaded hole (13) and at the other end a second pair of stem pieces (15) which extend from said second stem base portion (10) and are spaced substantially in parallel with each other, said second fitting piece (7) of said socket (5) being engaged with said second filling hole (12); a first locking screw (14) forcedly screwed into said first threaded hole (13) so as to expand said first pair of stem pieces (15) outwardly; and a second locking screw (14) forcedly screwed into said second threaded hole (13) so as to expand said second pair of stem pieces (15) outwardly, wherein said head (2) is provided with a first constriction member mounting structure, and said socket (5) is provided with a second constriction member mounting structure; a first constriction member, mounted to said first constriction member mounting structure, to constrict a first tendon sheath; and a second constriction member, mounted to said second constriction member mounting structure, to constrict a second tendon sheath.