In a method of manufacturing an ultrasonic transducer array a plurality of
discrete transducer elements are formed on an initially flat flexible
substrate together with electrically conductive tracks, through which the
transducer elements will be energised in use, the flexible substrate with
the discrete transducer elements and conductive tracks mounted thereon
then being formed into a cylinder and mounted on the end of a catheter
tube, the substrate being radially outwardly of the transducer elements so
that it is in a position to act also as an acoustic matching layer between
the material of the transducer elements and the human tissues or blood
when in use.
