Preparation process of two-dimensional annular phased array ultrasonic transducer

Abstract

The invention discloses a preparation process of a two-dimensional annular phased array ultrasonic transducer. Firstly, an annular array is cut and divided using a 1-3 type piezoelectric composite material; electrodes are cut and divided only by cutting through the electrodes, and crosstalk interference among array elements can be effectively reduced without cutting through piezoelectric ceramics; the conversion efficiency of the transducer is greatly improved due to the simple vibration mode of the 1-3 composite material; then, a matching layer is further added to the front end of a radiation surface of the annular array, so that the emission sensitivity of the transducer is improved; and a backing is added to the rear end of the annular array to further suppress the influence of crosstalk interference on a focused sound field. The ultrasonic transducer is a center opening type two-dimensional annular phased array ultrasonic transducer, a B-mode ultrasound installation position is reserved, and B-mode ultrasound diagnosis, planning, dosage, safety monitoring and the like can be achieved; and moreover, the axial dynamic deflection of a focus can be realized, and the treatment precision and the treatment efficiency of focused ultrasound are improved.

Description

technical field [0001] The invention relates to a preparation process of a two-dimensional annular phased array ultrasonic transducer, which belongs to the technical field of medical devices. Background technique [0002] High-intensity focused ultrasound (HIFU) technology originated in the 1940s. With the development of high-precision imaging and positioning technology, this technology has shown its superiority in many aspects compared with traditional surgery, and has great clinical application value. . Because of its thermal effect, cavitation effect and biological effect on the body, high-intensity focused ultrasound can position the focus on the target tissue in the body, and the ultrasonic energy will be quickly and accurately concentrated on the focal area, so that the diseased tissue in the target area can be instantly degenerated to achieve the purpose of treatment . During the treatment process, the skin burn rate is extremely small, basically does not damage nor...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a two-dimensional annular phased array ultrasonic transducer preparation process, which is mainly used to solve the difficulty of precision control caused by the fixed focus of the existing single element transducer and the huge structure; The focus deflection range of the array transducer is small, the energy of the side lobe after deflection is large, and the energy of the axial submaximum point is high, which will cause damage to the non-treatment area during use and affect the practical application of the phased array.

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