Phased focusing device

Abstract

The present invention relates to a phase controlled focusing device. It includes transmitter, said transmitter includes at least 10 vibration elements, every vibration element includes base, piezoelectric ceramic piece, frequency source, power device, power supply, phase shifter and frequency divider. The piezoelectric ceramic piece and frequency source are fixed on the base, said base is fixed on the transmitter, the power supply is respectively connected with the input ends of phase shifter and frequency divider, the output ends of phase shifter and frequency divider are respectively connected with input end of power device, the output end of said power device is connected with the frequency source. Besides, said invention also provides its working principle and its extensive application field.

Description

technical field

[0001] The invention relates to a phase control focusing device, in particular to a phase control focusing device with a spherical piezoelectric ceramic sheet. Background technique

[0002] At present, in HIFU (High Energy Focused Ultrasound) anti-cancer hyperthermia machines, the shape of the emitter in the phase control focusing device is usually concave or a combination of concave surfaces. Although the emitter of this shape is in the direction of emission, its focus is accurate, but In the direction perpendicular to the emission direction, its focusing range is narrow, the opening angle of the planar vibration element is about 11°, and it can only produce focus within the range of ±5° from the emission direction. In order to overcome this defect, many measures have been taken. Many improvements were made, for example to increase the focus range of the emitter. People let the transmitter rotate under the drive of the motor. Although it solves the problem ...

Images