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Contact focusing type medical piezoelectric ultrasonic transducer and preparation method

A piezoelectric ultrasonic and transducer technology, applied in the direction of fluid using vibration, etc., can solve the problem that the bandwidth and sensitivity of the transducer are not optimal, the performance of the final product is difficult to effectively control, and the manufacturing process of the transducer is unstable. and other problems, to achieve the effect of improving picture quality, lateral resolution improvement, and good vibration characteristics

Active Publication Date: 2020-04-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, the acoustic impedance of the traditional transducer matching layer can only be adjusted between 2-7MRayl, which is still far from the theoretical value of 9.3MRayl, resulting in the bandwidth and sensitivity of the transducer not reaching the optimal level
On the other hand, the manufacturing process of traditional transducers is unstable, and it is difficult to effectively control the performance of the final product, which causes inconvenience to the mass production of traditional transducers

Method used

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  • Contact focusing type medical piezoelectric ultrasonic transducer and preparation method
  • Contact focusing type medical piezoelectric ultrasonic transducer and preparation method
  • Contact focusing type medical piezoelectric ultrasonic transducer and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] see figure 1 , a contact focused medical piezoelectric ultrasonic transducer, comprising: a housing 7, a second matching layer 2, and a backing block 5, a piezoelectric layer 3, first matching layer 1;

[0043] The first matching layer 1 is a magnesium alloy layer, the second matching layer 2 is a concave acoustic lens of epoxy resin, the thickness of the first matching layer 1 and the second matching layer 2 are both a quarter of the working wavelength of the transducer, The upper surface and the lower surface of the piezoelectric layer 3 are provided with electrodes 4, the backing block 5 is fixed on the upper surface of the piezoelectric layer 3, the first matching layer 1 is fixed on the lower surface of the piezoelectric layer 3 and is electrically connected thereto, the first The matching layer 1 is also electrically connected to the housing 7 , and the second matching layer 2 is fixed on the lower surface of the first matching layer 1 .

[0044] Wherein, the ma...

Embodiment 2

[0058] see figure 1 , the present embodiment provides a contact-focused medical piezoelectric ultrasonic transducer preparation method based on embodiment 1, comprising the following steps:

[0059] S1: Using piezoelectric ceramics as the piezoelectric layer 3, and forming electrodes 4 on the upper and lower surfaces of the piezoelectric layer 3 by being treated with silver;

[0060] S2: using a magnesium alloy as the first matching layer 1, and fixing the upper surface of the first matching layer 1 to the lower surface of the piezoelectric layer 3;

[0061] S3: Configure and stir according to the proportioning material of the backing block 5. After curing, cut the cured backing block 5 into the required size and fix it on the upper surface of the piezoelectric layer 3, wherein the backing block The proportioning material of 5 is the proportioning material of resin: tungsten powder: glass ball=1:4:0.5;

[0062] S4: Put the fixed backing block 5, the piezoelectric layer 3 and...

Embodiment 3

[0077] see figure 1 , This embodiment provides a 10 MHz single-element focused ultrasonic transducer based on Embodiment 1 with an AZ31B magnesium alloy as the first matching layer. The device adopts the structure required by any one of Embodiment 1. In this embodiment, the piezoelectric layer 3 is made of PZT-5h ceramics with a diameter of 2.3 mm and a thickness of 0.2 mm. The diameter of the first matching layer magnesium alloy AZ31B is 2.3mm, the thickness is 160μm, and the size of the backing block 5 is 2.3*2.3mm 2 , the thickness is 2mm, and the center thickness of the thinnest part of the second matching layer Epo-Tek301 concave acoustic lens is 65μm. It is calculated that the radius of curvature of this embodiment is 3 mm, and the value of the focal length f is 6.9 mm. The resonance frequency measured by the impedance analyzer is 9.23MHz, the anti-resonance frequency is 11.52MHz, and the effective electromechanical coupling coefficient K is calculated eff is 0.59. D...

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Abstract

The invention discloses a contact focusing type medical piezoelectric ultrasonic transducer which is characterized by comprising a shell, a second matching layer, a backing block, a piezoelectric layer and a first matching layer, and the backing block, the piezoelectric layer and the first matching layer are sequentially arranged in the shell from top to bottom. The first matching layer is a magnesium alloy layer, the second matching layer is a concave acoustic lens made of epoxy resin, and the thickness of the first matching layer and the thickness of the second matching layer are one fourthof the working wavelength of the transducer. The upper surface of the second matching layer is connected with the lower surface of the first matching layer, the upper surface of the first matching layer is connected with the lower surface of the piezoelectric layer, and the upper surface of the piezoelectric layer is connected with the lower surface of the backing block. The bandwidth range of theprepared 5MHz-10MHz focused ultrasonic transducer is 60%-75%, the sensitivity range of the prepared 5MHz-10MHz focused ultrasonic transducer is -10.5 dB to -12.2 dB, and meanwhile, the prepared 5MHz-10MHz focused ultrasonic transducer has relatively large bandwidth and relatively high sensitivity, so that the resolution of an ultrasonic image is improved, and the image distortion is reduced.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic transducers, in particular to a contact-type focused medical piezoelectric ultrasonic transducer and a preparation method. Background technique [0002] In the field of medical imaging, ultrasound has become one of the most widely used medical diagnostic imaging methods, second only to traditional X-rays. The performance and quality of the ultrasonic transducer directly affect the performance of the whole machine. In order to obtain a clear and deep ultrasonic image under short pulse excitation, the transducer must have a wide frequency bandwidth and high sensitivity. Transducers have strict design requirements, so the performance and quality of ultrasonic transducers are very important. [0003] In the prior art, the acoustic impedance of the matching layer of the traditional transducer can only be adjusted between 2-7MRayl, which is still far from the theoretical value of 9.3MRayl, resulting...

Claims

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Application Information

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IPC IPC(8): B06B1/06B06B3/00
CPCB06B1/0655B06B3/00B06B2201/55B06B2201/76
Inventor 陶婧雅郭菲菲王锋华靳丽董杰
Owner SHANGHAI JIAO TONG UNIV
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