An ultrasound medical system includes a tube and resiliently flexible
fingers. The tube has a distal end insertable into a patient and has a
lumen with a distal opening. The fingers are extendable out of the distal
opening of the lumen creating a deployed state and are at-least-partially
retractable into the distal opening of the lumen creating a stowed state.
Each finger includes an ultrasound transducer, wherein the distance
between the transducers of adjacent fingers is greater in the deployed
state than in the stowed state. In one example, at least one of the
transducers is an ultrasound imaging transducer, an ultrasound
medical-treatment transducer, or an ultrasound imaging and
medical-treatment transducer.