The invention relates to a process for producing a medical implant from a titanium alloy, by investment－casting the titanium alloy in a casting mold which corresponds to the implant that is to be produced. The invention provides for using a β－titanium alloy, hot isostatic pressing, solution annealing, and then quenching. The invention also covers a corresponding medical implant which has been produced from a titanium alloy using the investment casting process. The titanium alloy is a β－titanium alloy and has a mean grain size of at least 0.3 mm. The invention allows economical production of objects from β－titanium alloys using the investment casting process. The invention thereby makes it possible to combine the advantageous properties of β－titanium alloys, in particular their excellent mechanical properties, with the advantages of producing objects by the precision casting process. The invention enables even implants of complex shapes, such as femurparts (1) of hip joint prostheses, which it has been impossible (economically) to produce by conventional forging processes, to be produced from a β－titanium alloy.本發明係關於一種鈦合金醫療植入物之製造方法，其在一與欲製造的植入物相符合之鑄塑模具中進行熔模鑄造該鈦合金。本發明使用β－鈦合金、進行熱等壓加壓、固溶退火、然後淬火。本發明亦涵蓋一種已使用熔模鑄造方法從鈦合金製造之相符合的醫療植入物。該鈦合金為一β－鈦合金且具有平均晶粒尺寸至少0.3毫米。本發明允許使用熔模鑄造方法從β－鈦合金經濟地製造出一物體。因此，本發明可結合β－鈦合金的優良性質(特別是優良的機械性質)與利用精確的鑄塑方法來製造物體之優點。本發明能夠甚至從β－鈦合金製造出一複雜形狀的植入物，諸如人工髋關節的股骨部份，此先前無法利用習知的鍛造方法來經濟地製造。
