Artificial joint, particularly an artificial hip joint

The joint socket (1) has a concave spherical surface (A) with centre (Ms), while the head (2) has a convex spherical surface (B) with centre (Mk), and is symmetrical in relation to a clamping axis (D) extending in the direction of a neck in the stem (27) of the artificial hip-joint. The surfaces (A,...

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Bibliographische Detailangaben
1. Verfasser:	MANFRED SEMLITSCH
Format:	Patent
Sprache:	eng
Schlagworte:	BANDAGES, DRESSINGS OR ABSORBENT PADS DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS DRESSING OR CONDITIONING OF ABRADING SURFACES FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION GRINDING HUMAN NECESSITIES HYGIENE MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING MEDICAL OR VETERINARY SCIENCE ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PERFORMING OPERATIONS POLISHING PROSTHESES TRANSPORTING TREATMENT OR PROTECTION OF EYES OR EARS
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Beschreibung
Zusammenfassung:	The joint socket (1) has a concave spherical surface (A) with centre (Ms), while the head (2) has a convex spherical surface (B) with centre (Mk), and is symmetrical in relation to a clamping axis (D) extending in the direction of a neck in the stem (27) of the artificial hip-joint. The surfaces (A,B) have mean radii (R,r), the difference between which is 35 microns. The manufacturing tolerance for surface (A) over an angle between 90 and 180 degrees is less than plus or minus 7.5 microns, while that for surface (B) over more than 140 degrees is less than plus or minus 2 microns. Outside this surface the head is stepped to form a surface (C) of smaller radius from the centre (Mk). Roughness of the surfaces (A,B) is less than 0.08 microns.