Patent ID: 9402669
Filing Date: 2016-08-02
CPC Classification: A61B,A61L,B22F

Claim Text:
1. A method for producing a medical implant, such as a bone screw, a bone nail, a bone pin, a plate, or a suture anchor for attaching soft tissues, such as tendons, muscles and ligaments, to a bone, or in the form of an endoprosthesis or at least a part thereof, from a magnesium alloy comprising a magnesium content of at least 80% by weight, a rare earth metal content from 2.5 to 5% by weight, an yttrium content from 1.5 to 5% by weight, a zirconium content from 0.1 to 2.5% by weight by weight, a zinc content from 0.01 to 0.8% by weight and unavoidable impurities, wherein the total content of possible impurities is less than 1% by weight and the aluminium content is smaller than 0.5% by weight, and the remainder contains magnesium up to 100% by weight, comprising the following steps: a) melting the alloy components at 700 to 900° C. and then mixing them thoroughly to obtain a magnesium alloy, and pouring the magnesium alloy into moulds at a temperature of 700 to 900° C., b) melting the magnesium alloy to obtain an alloy melt, c) atomising the alloy melt at a temperature from 775 to 850° C. and under a pressure from 17 to 23 bar in a protective gas atmosphere, and at the same time cooling the atomised alloy melt to below its solidification point to obtain an alloy powder, d) shaping the alloy powder by compaction under cold istostatic conditions for obtain an alloy green body with at least 100 bar, e) extruding the alloy green body to obtain a magnesium alloy moulded part, wherein the alloy green body is heated to a temperature from 300 to 400° C. before extrusion, and f) producing the medical implant from the magnesium alloy moulded part.