A radio communication scheme applicable to UMTS providing packet data services, such as multimedia broadcast and multicast services, to one or more users by modifying certain existing radio communication protocols while employing a new transport channel, andor by establishing new physical downlink shared channels. The blends comprise a bioresorbable copolymer and a further bioresorbable polymer. 05 to 5% of at least one silane for coating metals. Cutting blade sets are mounted on the shafts. The graphical interface displays for the user a visual record of the progress of the process from start to finish and guides the user so that so that individual lesions desired within a given level are all formed, and that a given level of lesions is not skipped. A secondary air supply system includes a supply section arranged to supply air to a portion of the exhaust path which is upstream with respect to the divergent section, using a negative pressure generated by the newly generated shock wave.