Patent ID: 7771372

Claim:
A catheter system for delivering ultrasonic energy to a treatment site within a body lumen, the catheter system comprising: a tubular body having a proximal end and a distal end; and an inner core configured for insertion into the tubular body, the inner core comprising: a first ultrasound radiating member axially separated from a separate and distinct second ultrasound radiating member by an intermediate flexible joint region, the first ultrasound radiating member positioned proximal to the second ultrasound radiating member, each ultrasound radiating member comprising a distal and proximal flat sides that extend generally perpendicular to a longitudinal axis of the tubular body and inner core, the distal and proximal flat sides of the ultrasound radiating member each including an electrode, an electrically conductive portion configured to allow a voltage difference to be applied to the electrodes of the first and second ultrasound radiating members, and a high acoustic impedance member, which is not one of the ultrasound radiating members, positioned proximal to the proximal flat side of the first ultrasound radiating member.