WO2017075888A1 - 基于径向模式的单阵元超声低频换能器 - Google Patents

基于径向模式的单阵元超声低频换能器 Download PDF

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WO2017075888A1
WO2017075888A1 PCT/CN2015/099751 CN2015099751W WO2017075888A1 WO 2017075888 A1 WO2017075888 A1 WO 2017075888A1 CN 2015099751 W CN2015099751 W CN 2015099751W WO 2017075888 A1 WO2017075888 A1 WO 2017075888A1
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piezoelectric material
radial
frequency transducer
ultrasonic low
element ultrasonic
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PCT/CN2015/099751
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English (en)
French (fr)
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郑海荣
李永川
苏敏
钱明
邱维宝
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中国科学院深圳先进技术研究院
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction

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  • the invention relates to a single-element ultrasonic low-frequency transducer based on a radial mode, and belongs to the technical field of ultrasonic transducers.
  • brain science research has become a hot spot in medical research.
  • research tools for brain science include heat, electricity, sound, light, and magnetism, while ultrasound stimulation has a series of advantages over other stimuli.
  • Existing medical transducers are generally limited by the condition that the smaller the frequency, the larger the size. For example, when the frequency is less than 2 MHz, the thickness of the piezoelectric material needs to be greater than 0.7 mm. In order to maintain a single vibration mode of the piezoelectric material in the thickness direction of the transducer, the piezoelectric material needs to have a size of at least 5 mm in the other two directions. However, in some specific application scenarios, such as for ultrasonic stimulation of the brain and other organs of small animals, in order to achieve better experimental results, it is necessary to control the size of the transducer within 2 mm, thus the existing Medical transducers are not sufficient.
  • the invention solves the problem that the existing medical transducer can not meet the ultrasonic stimulation requirement of the animal organ when the working state of the predetermined frequency is provided, and further proposes a single-element ultrasonic low-frequency exchange based on the radial mode.
  • the energy device specifically includes the following technical solutions:
  • a single-element ultrasonic low-frequency transducer based on a radial mode comprising: a casing, a piezoelectric material, a first cable, and a second cable, the piezoelectric material being disposed in the casing by a predetermined bonding material, the A cable is connected to the positive electrode of the piezoelectric material, and the second cable is connected to the negative electrode of the piezoelectric material, and the ratio of the radial length to the thickness of the piezoelectric material ranges from 5 to 20.
  • the beneficial effects of the present invention are: by converting the radial vibration of the piezoelectric material into the vibration in the thickness direction, a transducer having a frequency less than 2 MHz and a radial length of less than 2 mm is proposed, which can be used for animal tissues and organs, especially the brain.
  • Ultrasound point stimulation with small stimulation area and more accurate experimental data, makes it possible to use small ultrasonic transducers for ultrasonic stimulation of small animal organs.
  • FIG. 1 is a block diagram showing an assembly structure of a single-element ultrasonic low frequency transducer based on a radial mode by way of example.
  • FIG. 2 is an overall structural diagram showing a single-element ultrasonic low frequency transducer based on a radial mode by way of example.
  • the present embodiment provides a single-element ultrasonic low-frequency transducer based on a radial mode, as shown in FIG. 1 and FIG. 2, comprising: a casing 1, a piezoelectric material 2, a first cable 4, and a second cable 5,
  • the piezoelectric material 2 is disposed in the outer casing 1 by an adhesive material, the first cable 4 is connected to the positive electrode of the piezoelectric material 2, the second cable 5 is connected to the negative electrode of the piezoelectric material 2, and the radial length and thickness of the piezoelectric material 2 are The ratio ranges from 5 to 20.
  • the outer casing 1 can be processed into a structure having an inner diameter of 2 ⁇ 0.5 mm, an outer diameter of 3 ⁇ 0.5 mm, and a depth of 1 ⁇ 0.5 mm according to an actual application scenario.
  • the piezoelectric material 2 can be determined according to the size of the desired frequency, and the thickness of the piezoelectric material 2 is processed to be within 1/5 of the radial dimension, and the piezoelectric material 2 is fixedly disposed on the outer casing 1 by the bonding material.
  • the bottom surface and the positive and negative electrodes of the piezoelectric material 2 are taken out using the first cable 4 and the second cable 5.
  • the transducer further comprises a sealing material 3, the sealing material 3 fixing the piezoelectric material 2 in the outer casing 1.
  • the sealing material 3 can seal the piezoelectric material 2 in the outer casing 1 by means of perfusion, and when the sealing material 3 is made of a liquid adhesive such as epoxy resin, it can be added to the outer casing 1 by perfusion, and the sealing can be performed.
  • the material 3 is more evenly distributed in the outer casing 1 and maintains a relatively uniform pressure on the piezoelectric material 2.
  • the infused epoxy resin acts to insulate and seal after curing, thereby improving the stability of the transducer.
  • the bonding material is an organic bonding material, which may include an epoxy resin or the like.
  • the outer casing 1 is made of a simple element of metal, a metal alloy or a plastic.
  • a metal alloy for example, stainless steel, iron-based alloy or nickel-based alloy can be used for corrosion-resistant metal materials, and plastic materials can also be used, which can also achieve corrosion resistance and meet the requirements of ultrasonic low-frequency transducer strength.
  • the piezoelectric material 2 has a radial length of less than 2 mm.
  • the diameter of the piezoelectric material 2 can be The length is machined to no more than 2 mm so that the transducer can extend into the brain or other organs of small animals and provide an ultrasonic low frequency stimulation signal that meets the requirements.
  • the positive and negative electrodes of the piezoelectric material 2 are disposed in two parallel planes.
  • the positive and negative electrodes of the electrode are placed on two sides, and the positive and negative electrodes can be used with cables. The two sides are respectively taken out, and if the piezoelectric material is covered with an edge electrode, the positive and negative electrodes can be taken out from the same surface by a cable. Therefore, the positive and negative electrodes drawn in the same plane or parallel plane can maintain the pressure balance between the two poles, avoiding the excessive pressure generated by one pole during the vibration and damaging the transducer.
  • the piezoelectric material 2 is a piezoelectric ceramic, a piezoelectric composite, a single crystal material or a thin film material.
  • a piezoelectric type material When a piezoelectric type material is used, mechanical vibration can be converted into an electrical signal or mechanical vibration can be generated by an electric field to achieve ultrasonic stimulation of an animal's organs.
  • the radial length of the piezoelectric material 2 can be formed to a target size by a dicing saw or a special jig, and a precise plane is used.
  • a tool such as a grinder, a grinder, and a sandpaper polishes the thickness of the piezoelectric material 2, and controls the thickness of the piezoelectric material 2 within 1/5 of the radial length.
  • the single-element ultrasonic low-frequency transducer based on the radial mode provided in this embodiment includes: outer casing 1, piezoelectric material 2, sealing material 3 a first cable 4 and a second cable 5, the piezoelectric material 2 is disposed in the outer casing 1 by an adhesive material, the first cable 4 is connected to the positive electrode of the piezoelectric material 2, and the second cable 5 is connected to the negative electrode of the piezoelectric material 2.
  • the sealing material 3 seals the piezoelectric material 2 in the outer casing 1 by perfusion, and the piezoelectric material 2 has a vibration frequency of 2 MHz and a ratio of the radial length to the thickness is equal to five.
  • the piezoelectric material 2 and the outer casing 1 are tightly bonded by the sealing material 3, and the piezoelectric material 2 generates radial vibration and thickness direction vibration during operation, according to the piezoelectric material 2 in two vibration directions. Different sizes will produce two different sound waves.
  • the ratio of the radial length to the thickness of the piezoelectric material 2 is in the range of 5 times or more to 20 times or less, the two frequencies can be distinguished.
  • a piezoelectric material that produces a 1 MHz acoustic wave has a radial length of about 1.5 mm, and a thickness of 1/5 of a radial length is 0.3 mm, and a piezoelectric material having a thickness of 0.3 mm produces an acoustic wave. It is 5MHz.
  • the frequency of the excitation signal can be set at a radial resonance frequency of 1 MHz. Since the resonant frequency error of the transducer typically does not exceed 20%, the radial resonant frequency range can be determined to be 0.8-1.2 MHz, which is much less than 5 MHz of the thickness resonant frequency. Therefore, during the working process, the radial vibration of the piezoelectric material 2 will drive the outer casing 1 bonded thereto to perform radial vibration, thereby causing the surrounding medium to make radial vibration, so that the transducer generates ultrasonic waves to the animal. The organ is stimulated.
  • the single-element ultrasonic low-frequency transducer based on the radial mode proposed by the present embodiment is proposed to convert the radial vibration of the piezoelectric material into the vibration in the thickness direction, and propose a frequency less than 2 MHz and a radial length of less than 2 mm.
  • the transducer can perform ultrasonic stimulation on animal tissues and organs, especially the brain, and has the characteristics of small stimulation area and more accurate experimental data, which makes it possible to ultrasonically stimulate small animal organs by using a miniature ultrasonic transducer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

一种基于径向模式的单阵元超声低频换能器，包括：外壳(1)、压电材料(2)、第一电缆(4)和第二电缆(5)，压电材料(2)通过预定粘接材料设置在外壳(1)中，第一电缆(4)与压电材料(2)的正极连接，第二电缆(2)与压电材料(2)的负极连接，压电材料(2)的径向长度与厚度的比值范围为5～20。

Description

基于径向模式的单阵元超声低频换能器 技术领域
本发明涉及一种基于径向模式的单阵元超声低频换能器，属于超声换能器技术领域。
背景技术
随着医学水平持续发展，脑科学研究成为目前医学研究的一大热点。一般来说用于脑科学的研究工具包括热、电、声、光、磁五大方面，而超声刺激相对其它刺激具有无创、安全等一系列的优势。
现有的医用换能器通常受到频率越小则尺寸越大的条件限制，例如当频率小于2MHz时，压电材料的厚度需要大于0.7mm。而为了维持换能器中压电材料在厚度方向上的单一振动模式，压电材料在其它两个方向的尺寸至少需要达到5mm。但是在一些特定应用场景中，例如用于对小型动物的脑部以及其它器官的超声刺激时，为了达到更好的实验效果，需要将换能器的尺寸控制在2mm之内，因此现有的医用换能器无法满足要求。
发明内容
本发明为解决现有的医用换能器在提供预定频率的工作状态时，其尺寸无法满足对动物器官的超声刺激要求的问题，进而提出了一种基于径向模式的单阵元超声低频换能器，具体包括如下的技术方案：
基于径向模式的单阵元超声低频换能器，包括：外壳、压电材料、第一电缆和第二电缆，所述压电材料通过预定粘接材料设置在所述外壳中，所述第一电缆与所述压电材料的正极连接，所述第二电缆与所述压电材料的负极连接，所述压电材料的径向长度与厚度的比值范围为5～20。
本发明的有益效果是：通过将压电材料的径向振动转变为厚度方向的振动，提出了一种频率小于2MHz且径向长度小于2mm的换能器，能够对动物组织器官特别是脑部进行超声点刺激，具有刺激区域较小、实验数据更精准的特点，使利用微型超声换能器对小型动物器官进行超声刺激成为可能。
附图说明
图1是以示例的方式示出了基于径向模式的单阵元超声低频换能器的装配结构图。
图2是以示例的方式示出了基于径向模式的单阵元超声低频换能器的整体结构图。
具体实施方式
本实施例提出了一种基于径向模式的单阵元超声低频换能器，结合图1和图2所示，包括：外壳1、压电材料2、第一电缆4和第二电缆5，压电材料2通过粘接材料设置在外壳1中，第一电缆4与压电材料2的正极连接，第二电缆5与压电材料2的负极连接，压电材料2的径向长度与厚度的比值范围为5～20。
其中，外壳1可以根据实际的应用场景加工成内径为2±0.5mm、外径为3±0.5mm、深度为1±0.5mm的结构。压电材料2可根据所需频率的大小确定其直径，并将压电材料2的厚度加工为径向尺寸的1/5以内，再将压电材料2通过粘接材料固定设置在外壳1的底面，并使用第一电缆4和第二电缆5将压电材料2的正负极引出。
在一可选实施例中，该换能器还包括密封材料3，密封材料3将压电材料2固定设置在外壳1中。其中，密封材料3可通过灌注的方式将压电材料2密封在外壳1中，当密封材料3采用环氧树脂等液体粘接剂时，可通过灌注的方式加入到外壳1中，能够使密封材料3在外壳1中的分布更均匀，并且保持对压电材料2较均匀的压力，灌注的环氧树脂固化后能够起到绝缘和密封的作用，从而提高换能器的稳定性。
在一可选实施例中，粘接材料采用有机粘接材料，该有机粘接材料可以包括环氧树脂等。
在一可选实施例中，外壳1由金属单质、金属合金或塑料制成。例如采用不锈钢、铁基合金或镍基合金等抗腐蚀性较强的金属材料，另外也可以采用塑料材质，同样也可以达到耐腐蚀及满足超声低频换能器强度要求的目的。
在一可选实施例中，压电材料2的径向长度小于2mm。在对动物器官进行超声刺激的应用场景中，特别是针对小型动物的脑部超声刺激，需要将换能器的体积控制到能够伸入小型动物体内的程度，因此可将压电材料2的径向长度加工成不大于2mm，从而使该换能器既能够伸入到小型动物的脑部或其它器官，又能够提供符合要求的超声低频刺激信号。
在一可选实施例中，结合图2所示，压电材料2的正极和负极设置在平行的两个平面上。通常情况下电极的正极和负极分别设置在两个面上，可以使用电缆将正极和负极 从两个面分别引出，如果压电材料采用包边电极则可以利用电缆将正负极从同一个面引出。因此在同一平面或平行的平面中引出的正极和负极能够使两极之间保持压力平衡，避免一个极在振动过程中产生的压力过大而损坏换能器。
在一可选实施例中，压电材料2采用压电陶瓷、压电复合材料、单晶材料或薄膜材料。当采用压电类型的材料时，可以将机械振动转变为电信号或在电场驱动下产生机械振动，从而实现对动物器官产生超声波刺激。
在一可选实施例中，当根据目标频率确定压电材料2的径向长度后，可通过划片机或专用夹具将压电材料2的径向长度加工成型到目标尺寸，并使用精密平面磨床、研磨机及砂纸等工具打磨压电材料2的厚度，并将压电材料2的厚度控制在径向长度的1/5内。
下面通过具体的实施例对本发明提供的基于径向模式的单阵元超声低频换能器进行详细说明。
实施例一
结合图1和图2所示，本实施例提供的基于径向模式的单阵元超声低频换能器，结合图1和图2所示，包括：外壳1、压电材料2、密封材料3、第一电缆4和第二电缆5，压电材料2通过粘接材料设置在外壳1中，第一电缆4与压电材料2的正极连接，第二电缆5与压电材料2的负极连接，密封材料3通过灌注的方式将压电材料2密封在外壳1中，压电材料2的震动频率为2MHz且径向长度与厚度的比值等于5。
在本实施例中，压电材料2与外壳1通过密封材料3紧密粘接，压电材料2在工作的时候会产生径向振动和厚度方向的振动，根据压电材料2在两种振动方向的不同尺寸，会产生两种频率不同的声波。当压电材料2的径向长度和厚度的比例达到5倍以上至20倍以下的范围时，就能够将这两种频率区分开。例如：产生1MHz声波的压电材料的径向长度约为1.5mm，而将厚度设定为径向长度的1/5，则为0.3mm，而厚度为0.3mm的压电材料产生的声波约为5MHz。
因此，本实施例提供的基于径向模式的单阵元超声低频换能器在使用时，激励信号的频率可设置在径向谐振频率为1MHz。由于该换能器的谐振频率误差通常不会超过20％，所以径向谐振频率范围可以确定为0.8～1.2MHz，该径向谐振频率远小于厚度谐振频率的5MHz。所以在工作过程中，压电材料2的径向振动会带动与它粘接在一起的外壳1做径向振动，从而引起周围的介质做径向振动，以使该换能器产生超声波对动物器官进行刺激。
采用本具体实施方式提出的基于径向模式的单阵元超声低频换能器，通过将压电材料的径向振动转变为厚度方向的振动，提出了一种频率小于2MHz且径向长度小于2mm的换能器，能够对动物组织器官特别是脑部进行超声点刺激，具有刺激区域较小、实验数据更精准的特点，使利用微型超声换能器对小型动物器官进行超声刺激成为可能。
本具体实施方式是对本发明的技术方案进行清楚、完整地描述，其中的实施例仅仅是本发明的一部分实施例，而并不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有经过创造性劳动的前提下所获得的所有其它实施方式都属于本发明的保护范围。

Claims (9)

  1. 基于径向模式的单阵元超声低频换能器，包括：外壳、压电材料、第一电缆和第二电缆，所述压电材料通过预定粘接材料设置在所述外壳中，所述第一电缆与所述压电材料的正极连接，所述第二电缆与所述压电材料的负极连接，其特征在于，所述压电材料的径向长度与厚度的比值范围为5～20。
  2. 如权利要求1所述的基于径向模式的单阵元超声低频换能器，其特征在于，所述换能器还包括密封材料，所述密封材料将所述压电材料固定设置在所述外壳中。
  3. 如权利要求2所述的基于径向模式的单阵元超声低频换能器，其特征在于，所述密封材料通过灌注的方式将所述压电材料密封在所述外壳中。
  4. 如权利要求1所述的基于径向模式的单阵元超声低频换能器，其特征在于，所述粘接材料采用有机粘接材料。
  5. 如权利要求1所述的基于径向模式的单阵元超声低频换能器，其特征在于，所述外壳采用金属单质、金属合金或塑料制成。
  6. 如权利要求1所述的基于径向模式的单阵元超声低频换能器，其特征在于，所述压电材料的径向长度小于2mm。
  7. 如权利要求1或6所述的基于径向模式的单阵元超声低频换能器，其特征在于，所述压电材料的正极和负极设置在平行的两个平面上。
  8. 如权利要求1或6所述的基于径向模式的单阵元超声低频换能器，其特征在于，所述压电材料采用压电陶瓷、压电复合材料、单晶材料或薄膜材料。
  9. 如权利要求1或6所述的基于径向模式的单阵元超声低频换能器，其特征在于，所述压电材料的径向长度通过划片或夹具加工成型，所述压电材料的厚度通过平面磨床、研磨机或砂纸打磨成型。
PCT/CN2015/099751 2015-11-06 2015-12-30 基于径向模式的单阵元超声低频换能器 WO2017075888A1 (zh)

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