| http://www.w3.org/ns/prov#value | - The ultrasonic transducer 96 is coated with an appropriate insulating material, as for example a hydrogel, which in addition to isolating the same from the tip 86 also serves to provide a good impedance match between the transducer 96 and the medium in which the catheter 81 is disposed, as for example in blood.
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