CN111330170A

CN111330170A - Focusing ultrasonic transducer

Info

Publication number: CN111330170A
Application number: CN201811548464.0A
Authority: CN
Inventors: 郑海荣; 刘新; 邹超; 孟德; 李永川; 黄继卿
Original assignee: Shenzhen Institute of Advanced Technology of CAS
Current assignee: Shenzhen Institute of Advanced Technology of CAS
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2020-06-26

Abstract

The invention belongs to the technical field of ultrasonic waves, and particularly relates to a focusing ultrasonic transducer, which comprises: an ultrasonic transmitter and a plurality of piezoelectric elements. The plurality of piezoelectric units are arranged side by side, arc centers of the plurality of piezoelectric units face the same direction, each piezoelectric unit is electrically connected with the ultrasonic transmitter, and the ultrasonic transmitter can independently control each piezoelectric unit to form a corresponding acoustic radiation force focusing focus. The ultrasonic transmitter in the focused ultrasonic transducer can realize the change of the focal position by exciting the piezoelectric unit at the corresponding position, and the position of the focal point can be changed without moving the focused ultrasonic transducer. The focused ultrasonic transducer does not need to be additionally provided with a power device, the volume and the weight of the focused ultrasonic transducer can be reduced, the focused ultrasonic transducer is convenient to use under the conditions of being held by hands, and meanwhile, the focused ultrasonic transducer does not need to move the position of the focused ultrasonic transducer, so that the ultrasonic conduction energy loss is avoided, and the use effect is not influenced.

Description

Focusing ultrasonic transducer

Technical Field

The invention belongs to the technical field of ultrasonic waves, and particularly relates to a focusing ultrasonic transducer.

Background

The focused ultrasound transducer in modern medical beauty industry is widely applied, the focused ultrasound transducer on the market is mostly in a spherical crown shape, the transduction can only be focused in a single point, when other parts need to be stimulated, the position of the transducer can only be moved to change the position of a focus, bubbles are easy to appear after the position of the transducer is frequently moved and coupled, the loss of ultrasonic conduction energy is caused, the moving precision is not guaranteed well, if the position needs to be accurately moved, power devices such as a motor and the like need to be added, the transducer is heavy and inconvenient to use, and the transducer is not flexible in handheld application.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a focused ultrasound transducer, which aims to solve the problems that the position of the focused ultrasound transducer needs to be moved mechanically if the focal position of the existing focused ultrasound transducer needs to be changed, the operation is inconvenient, and the ultrasonic conduction energy loss is easy to occur after the movement.

To solve the above technical problem, the present invention is achieved by a focused ultrasound transducer comprising: an ultrasonic transmitter and a plurality of piezoelectric elements;

the piezoelectric units are arc-shaped, are arranged side by side, have arc centers facing the same direction, and are respectively electrically connected with the ultrasonic transmitter, the ultrasonic transmitter can independently control each piezoelectric unit to form a corresponding acoustic radiation force focusing focus, and the acoustic radiation force focusing focuses formed by the piezoelectric units can be matched randomly.

Furthermore, the inner arc surface of each piezoelectric unit is electrically connected with the positive electrode of the ultrasonic transmitter, and the outer arc surface of each piezoelectric unit is electrically connected with the negative electrode of the ultrasonic transmitter.

Further, the outer arc surfaces of the adjacent piezoelectric units are connected with each other, and the inner arc surfaces of the adjacent piezoelectric units are spaced from each other.

Further, the width, radian and arc length of each piezoelectric unit are the same.

Further, the distances between the intrados of two adjacent piezoelectric units are the same.

Further, each piezoelectric unit is electrically connected with the ultrasonic transmitter through a circuit board and a cable.

Compared with the prior art, the invention has the beneficial effects that: a focused ultrasound transducer of the present invention includes: an ultrasonic transmitter and a plurality of piezoelectric elements. The plurality of piezoelectric units are arranged side by side, arc centers of the plurality of piezoelectric units face the same direction, each piezoelectric unit is electrically connected with the ultrasonic transmitter, and the ultrasonic transmitter can independently control each piezoelectric unit to form a corresponding acoustic radiation force focusing focus. The ultrasonic transmitter in the focused ultrasonic transducer can realize the change of the focal position by exciting the piezoelectric unit at the corresponding position, and the position of the focal point can be changed without moving the focused ultrasonic transducer. The focused ultrasonic transducer does not need to be additionally provided with a power device, the volume and the weight of the focused ultrasonic transducer can be reduced, the focused ultrasonic transducer is convenient to use under the conditions of being held by hands, and meanwhile, the focused ultrasonic transducer does not need to move the position of the focused ultrasonic transducer, so that the ultrasonic conduction energy loss is avoided, and the use effect is not influenced.

Drawings

FIG. 1 is a schematic structural diagram of a single piezoelectric unit of an embodiment of the present invention;

FIG. 2 is a schematic illustration of the piezoelectric element of FIG. 1 actuated to form a focused focal point of acoustic radiation force;

FIG. 3 is a schematic structural diagram of a plurality of piezoelectric units according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the piezoelectric elements of FIG. 3 fully activated to form a focused focal point of acoustic radiation force;

FIG. 5 is a schematic diagram of the piezoelectric unit of FIG. 3 with staggered excitation to form acoustic radiation force focal points;

fig. 6 is a schematic diagram of the piezoelectric unit of fig. 3 activated to form a focused focal point of acoustic radiation force at a particular location.

In the drawings, each reference numeral denotes: 1. a piezoelectric unit; 11. an intrados surface; 12. an outer arc surface; 2. the acoustic radiation force focuses the focal point.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 6, a focused ultrasound transducer according to an embodiment of the present invention includes: an ultrasonic transmitter (not shown in the figure) and a plurality of piezoelectric units 1.

The shape of the piezoelectric unit 1 is arc, the plurality of piezoelectric units 1 are arranged side by side, and the arc centers of the plurality of piezoelectric units 1 face the same direction. Each piezoelectric unit 1 is electrically connected with an ultrasonic transmitter, the ultrasonic transmitter can independently control each piezoelectric unit 1 to form a corresponding acoustic radiation force focusing focus 2, and the acoustic radiation force focusing focuses 2 formed by the piezoelectric units 1 can be matched arbitrarily.

Further, the inner arc surfaces 11 of the piezoelectric units 1 are respectively and electrically connected with the positive electrode of the ultrasonic transmitter, and the outer arc surfaces 12 of the piezoelectric units 1 are respectively and electrically connected with the negative electrode of the ultrasonic transmitter.

Further, the extrados 12 of adjacent piezo-elements 1 are connected to each other, and the intrados 11 of adjacent piezo-elements 1 are spaced from each other. The width, radian and arc length of each piezoelectric unit 1 are the same. The distances between the intrados 11 of two adjacent piezoelectric units 1 are the same. Each piezoelectric unit 1 is electrically connected to the ultrasonic transmitter through a circuit board and a cable.

Specifically, the focusing ultrasonic transducer provided by the invention can realize multipoint focusing, the core of the focusing ultrasonic transducer is the arrangement of the arc-shaped piezoelectric units 1, the width, radian and arc length of the material of each piezoelectric unit 1 are required to be consistent so as to ensure that the focusing depth of each piezoelectric unit 1 is the same, then each piezoelectric unit 1 needs to be separately led and is connected to an ultrasonic transmitter through a circuit board, a cable and the like, and any array element can be separately controlled by the single lead so as to realize multipoint focusing.

As shown in fig. 1, a single piezoelectric unit 1 is an array element, and its inner and outer arc surfaces are provided with electrodes, i.e. positive and negative electrodes, wherein the inner arc surface is connected to the positive electrode, and the outer arc surface is connected to the negative electrode. The positive electrode and the negative electrode can generate ultrasonic waves under the condition of electrification, and form focusing at the arc center of the arc-shaped piezoelectric unit 1 to form a physical focus which is a place where the energy of acoustic radiation force is concentrated, wherein the focus is generally in an oval shape, as shown in fig. 2; after the piezoelectric units 1 are obtained, the piezoelectric units 1 are arranged in order by using a jig, the spacing between every two piezoelectric units 1 is required to be the same, the height dislocation cannot occur, and the piezoelectric units are concentric, as shown in fig. 3; after the arrangement, each piezoelectric unit 1 is separately leaded, when one piezoelectric unit 1 is excited, an acoustic radiation force focusing focal point 2 is correspondingly obtained at the arc center of the piezoelectric unit 1, and when all the piezoelectric units are excited, a row of focal points can be obtained, as shown in fig. 4; staggered excitation or excitation according to a specific position can obtain an acoustic radiation force energy focus at the corresponding position, as shown in fig. 5 and 6.

The embodiment of the invention provides a focused ultrasonic transducer, which comprises: an ultrasonic transmitter and a plurality of piezoelectric elements. The plurality of piezoelectric units are arranged side by side, arc centers of the plurality of piezoelectric units face the same direction, each piezoelectric unit is electrically connected with the ultrasonic transmitter, and the ultrasonic transmitter can independently control each piezoelectric unit to form a corresponding acoustic radiation force focusing focus. The ultrasonic transmitter in the focused ultrasonic transducer can realize the change of the focal position by exciting the piezoelectric unit at the corresponding position, and the position of the focal point can be changed without moving the focused ultrasonic transducer. The focused ultrasonic transducer does not need to be additionally provided with a power device, the volume and the weight of the focused ultrasonic transducer can be reduced, the focused ultrasonic transducer is convenient to use under the conditions of being held by hands, and meanwhile, the focused ultrasonic transducer does not need to move the position of the focused ultrasonic transducer, so that the ultrasonic conduction energy loss is avoided, and the use effect is not influenced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A focused ultrasound transducer, comprising: an ultrasonic transmitter and a plurality of piezoelectric elements (1);

the shape of piezoelectric unit (1) is the arc, and is a plurality of piezoelectric unit (1) sets up side by side, and is a plurality of the arc center of piezoelectric unit (1) is towards same direction, each piezoelectric unit (1) respectively with the ultrasonic transmitter electricity is connected, ultrasonic transmitter can control every alone piezoelectric unit (1) forms corresponding acoustic radiation power focus (2), and each can form arbitrary cooperation between the acoustic radiation power focus (2) that piezoelectric unit (1) formed.

2. The focused ultrasound transducer according to claim 1, wherein the intrados (11) of each piezoelectric element (1) is electrically connected to the positive electrode of the ultrasound transmitter, and the extrados (12) of each piezoelectric element (1) is electrically connected to the negative electrode of the ultrasound transmitter.

3. The focused ultrasound transducer according to claim 2, characterized in that the extrados (12) of adjacent piezo-elements (1) are connected to each other and the intrados (11) of adjacent piezo-elements (1) are spaced from each other.

4. A focused ultrasound transducer according to claim 3, characterized in that the width, the arc and the arc length of each piezoelectric element (1) are the same.

5. The focused ultrasound transducer according to claim 3, characterized in that the distances between the intrados (11) of two adjacent piezoelectric units (1) are all the same.

6. The focused ultrasound transducer according to any of the claims 1 to 5, characterized in that each of the piezoelectric elements (1) is electrically connected to the ultrasound transmitter by means of a circuit board and a cable.