Manufacturing of ultrasonic array therapy transducers

1. In the manufacturing of diagnostic ultrasonic transducers, in order to improve the sensitivity of the probe detection signal, the resolution of the imaging .As well as better fixing the probe array, engineers will design solid-state acoustic matching components for the probe, such as matching layer and backing layer. But for therapeutic probes, we are more concerned with the electroacoustic energy of the probe.it is conversion efficiency. Therefore, its packaging method is different from the diagnostic probe. For example, The purpose of backing layer of the treatment probe is to form large impedance difference with the piezo ceramic , so that the sound energy emitted by the array element along the backing surface can be maximized.The degree is transmitted into the tissue in the opposite direction, thereby achieving the design goal of the maximum acoustic energy emission efficiency of the therapeutic probe.

The commonly used backing layer is air, which is also the process used in this article.?As the research group, the first graduate student in the development direction of HIFU piezo ceramic therapeutic probes will inevitably face a shortage.Problems with the experience of manufacturing probe technology. Therefore, in this manufacturing, we have adopted a rough type of probe.Manufacturing route to create a multi-array element at a lower cost and faster speed in a limited time.It is the spherical crown high intensity focused ultrasound treatment probe. The specific route is to temporarily ignore acoustic matching and electrical matching.More attention is paid for the precise fixing of the array, and the basic probe packaging issues such as lead methods. Then how do wemanufacture of HIFU therapeutic probes can be completed quickly.

This chapter mainly introduces the manufacturing process of Hifu piezoelectric sensor crystal probes, including the selection and processing of piezo ceramic sheets.It is modeling, design, material selection, process fabrication, and probe assembly of HIFU probe package structures,array material selection and low cost processing.The HIFU hemisphere focusing piezoelectric is used as a power type ultrasonic generator.To have a high electromechanical cohesion coefficient, low node and mechanical loss. Usually the treatment of the ceramic sheet material used for PZT4 or PZT5. The piezoelectric material is used in the manufacturing of the probe is PZT4. PZT4 samples are shown in the piezoelectric parameters, geometric parameters, prices and other information can be found in the table.