HIP JOINT ENDOPROSTHESIS Russian patent published in 2007 - IPC A61F2/32 

FIELD: medicine; traumatic surgery; orthopedics.

SUBSTANCE: endoprosthesis has hollow, head, neck, leg, washer consisting of movable members, separated by gaps one from another; washer is disposed between surface of head and bottom of hollow. Endoprosthesis also has corrugated casing made of resilient material, which casing seals cavity of joint, which cavity is filled with lubricant. Members of washer are made in form of rings, which rings are put one onto another by their flat surfaces making contact one to another by means of surfaces being parallel to edge of hollow. External surfaces of rings are congruent to internal surface of hollow, internal surfaces are congruent to surface of head. Member of washer disposed between poles of head and of hollow is made in form of concave-convex menisci with spherical surfaces disposed concentrically. Top convex surface is congruent to internal surface of hollow and lower one, being concave in center, namely, head; flat edges of meniscus are conjugated with flat ends of ring-shaped member disposed lower. Gaps provide ability of making rocking shifts of members of washer between surfaces of head and of hollow, one relatively other, as well as rotational motions around their own axes. Members of washer and head are sustained in hollow by means if flange with fold, which flange is fixed at edge of hollow by means of air-proof washer. Corrugated casing is attached along end of fold and onto plug of neck. Cavity of casing, filled with lubricant is connected with cavity of joint, formed by capillary spaces, through openings in fold of flange.

EFFECT: improved results of cure; prolonged service life; optimization of bio-mechanical properties of endoprosthesis.

1 dwg