<qa>  How many patients have Tantalum beads implanted?Tantalum has been used for more than 50 years and is a very biocompatible material. Tantalum beads for RSA have been used especially in Sweden in several clinical studies for more than 20 years. More than 20.000 beads have been implanted in more than 2.000 patients and no side effects from Tantalum beads have been observed. 