| http://www.w3.org/ns/prov#value | - A device for examining a hollow organ, such as the heart, said device comprising a catheter having an axis and adapted to be placed inside the follow organ and including at an end, at least four circumferentially arranged, equidistantly distributed elements, each of which is adapted for the transmission and the reception of ultrasonic waves in successive transmission-reception periods, each of sai
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