Dual-frequency confocal ultrasonic transducer

Abstract

The invention discloses a dual-frequency confocal ultrasonic transducer, which is suitable for the fields of biological tissue characterization, tissue engineering mechanical performance regulation, ultrasonic non-destructive testing and the like. The dual-frequency confocal ultrasonic transducer specifically comprises piezoelectric elements, a back lining layer having a concave cylindrical surface, radio frequency bases and an outer shell, and is specifically characterized in that the dual-frequency confocal ultrasonic transducer has three independent piezoelectric elements and the corresponding radio frequency bases, the piezoelectric element is a piezoelectric film made of a piezoelectric macromolecule polymer, the upper surface of the piezoelectric film is covered with a positive electrode, the lower surface of the piezoelectric film is covered with a negative electrode, the piezoelectric film is closely attached to the concave cylindrical surface of the back lining layer, the positive electrode of the piezoelectric film is connected to the positive electrode of the corresponding radio frequency base through an electrode leading wire, and the positive electrode of the piezoelectric film is connected to the negative electrode of the corresponding radio frequency base through an electrode leading wire. According to the present invention, with the dual-frequency confocal ultrasonic transducer, ultrasonic waves with two different frequencies can be generated, such that the mechanical properties of the biological tissue can be evaluated, and the anisotropy of the material can be analyzed.

Description

technical field [0001] The invention relates to an ultrasonic transducer, in particular to a dual-frequency confocal ultrasonic transducer. The invention is applicable to the fields of biological tissue characterization, tissue engineering mechanical property regulation, ultrasonic non-destructive testing and the like. Background technique [0002] As a biophysical form, low-intensity ultrasound can produce thermal effects and unique cavitation effects in addition to mechanical effects. The energy in the ultrasound can generate alternating compression waves in the propagation medium, which increases the movement of molecules, resulting in increased vibration and collision of molecules, resulting in thermal effects. Because some enzymes are sensitive to small changes in temperature, the slight thermal effect produced by low-intensity ultrasound can still affect the activity of some enzymes. As an alternating pressure wave, ultrasound can create stable cavities and transmit ...

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Problems solved by technology

However, the contact force and deformation during the detection process will cause damage and withering of the chondrocytes on the contact surface.

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