An information reproducing apparatus has a read device, is capable of reproducing sub picture information and is also capable of performing a highlight display of the sub picture information. An embolic device is retained within the delivery catheter by a mechanical interlocking mechanism which includes an engagement member attached to the distal end of the pusher member and extends through a retaining ring at the proximal end of the embolic device. First, the vibration characteristics of at least one valve assembly prior to operation may be measured.