Flexible variable frequency ultrasonic therapeutic probe based on thermoacoustic effect of carbon nanotube film

A flexible variable frequency ultrasonic therapeutic probe based on thermoacoustic effect of a carbon nanotube film, wherein the flexible variable frequency ultrasonic therapeutic probe comprises an ultrasonic sound production element, and a heat dissipation layer and an acoustic matching layer respectively located on two sides of the ultrasonic sound production element;

• the ultrasonic sound production element includes a carbon nanotube film and conductive metal electrodes respectively located on two ends of the carbon nanotube film, wherein each metal electrode is connected with a wire, the wire is used for connecting an external device or power supply, one wire is used as an signal input end, and the other wire is used as a signal output end;
• the heat dissipation layer and the acoustic matching layer are respectively arranged on two sides of the carbon nanotube film, and the acoustic matching layer is fitted to a surface of a subject, with the acoustic impedance of the acoustic matching layer set between that of the ultrasonic sound production element and of the subject;
• and a signal is input into the sound production element though the signal input end and output by the signal output end, and when the signal flows through the carbon nanotube film, a surface of the carbon nanotube film rapidly produces a temperature change, which causes the surrounding environmental media to expand and contract and to excite ultrasonic waves with wide bandwidth;
• the carbon nanotube film includes carbon nanotubes arranged in a first direction, and the first direction of the carbon nanotubes is parallel to a second direction along which the surface of the carbon nanotube film is extended;
• the metal electrodes are respectively connected to two ends of the carbon nanotube film in the first direction, and the carbon nanotube film is tensioned after being connected with the metal electrodes.