Ultrasonic energy application with inflatable lens

摘要

An ultrasonic emitter, comprising:
an active element having an exterior surface facing in a radially outward direction and an interior surface facing in a radially inward direction, the active element being operative to generate ultrasonic vibrations in response to an electrical potential applied between electrodes of the active element;
an internal structure, the internal structure being spaced apart from the interior surface of the active element so as to define a space, wherein the space is configured to receive a liquid, when in use; and
the internal structure forming a reflective interface where, when in use, at least some of the emitted ultrasonic vibrations are reflected and directed into a medium coupled to the exterior surface of the active element.