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...http://www.google.es/patents/US7473224?utm_source=gb-gplus-sharePatente US7473224 - Deployable ultrasound medical transducers
