WO2021196455A1 - Transducteur ultrasonore et appareil d'imagerie ultrasonore - Google Patents

Transducteur ultrasonore et appareil d'imagerie ultrasonore Download PDF

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Publication number
WO2021196455A1
WO2021196455A1 PCT/CN2020/103678 CN2020103678W WO2021196455A1 WO 2021196455 A1 WO2021196455 A1 WO 2021196455A1 CN 2020103678 W CN2020103678 W CN 2020103678W WO 2021196455 A1 WO2021196455 A1 WO 2021196455A1
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Prior art keywords
layer
ultrasonic
sound wave
ultrasonic transducer
ultrasonic sound
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PCT/CN2020/103678
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English (en)
Chinese (zh)
Inventor
苏敏
夏向向
邱维宝
蔡飞燕
郑海荣
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深圳先进技术研究院
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Publication of WO2021196455A1 publication Critical patent/WO2021196455A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
    • A61B8/0891—Detecting organic movements or changes, e.g. tumours, cysts, swellings for diagnosis of blood vessels
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
    • A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer

Definitions

  • the embodiments of the present application relate to imaging technology, for example, to an ultrasonic transducer and an ultrasonic imaging device.
  • Atherosclerosis is a cardiovascular disease with a high fatality rate, and the detection of atherosclerosis mainly relies on ultrasound transducers.
  • Ultrasonic transducers in the related art include mechanical curved transducers and planar transducers.
  • the mechanical curved transducer is an acoustic lens with a certain curvature made at the front end of the ultrasonic transducer to detect the diseased blood vessel wall and Atherosclerotic plaque, but the focus of the ultrasonic transducer of the mechanical curved surface is determined by the radius of curvature of the mechanical curved surface. Because the radius of curvature of the mechanical curved surface is difficult to be small, it is difficult to generate a focus at a close position;
  • the energy transducer is made into a flat acoustic lens at the front end of the ultrasonic transducer.
  • the flat transducer can generate a natural far field point in front of the transducer.
  • the distance and size of the far field point are determined by the frequency of the flat transducer And the size is determined.
  • the larger the size of the planar transducer the farther the distance from the far field point, the deeper the structure information of the blood vessel can be obtained.
  • the size of the planar transducer is larger, it cannot enter the blood vessel and cannot be detected. Diseased vessel walls and atheromatous plaques.
  • the embodiments of the present application provide an ultrasonic transducer and an ultrasonic imaging device, so as to realize the technical effect of using the ultrasonic transducer to focus within an ideal distance range and improve the resolution of the ultrasonic image.
  • an ultrasonic transducer which includes: a backing layer, a piezoelectric layer, a matching layer, and a structural layer; wherein,
  • the backing layer is arranged at the bottom end of the ultrasonic transducer
  • the piezoelectric layer is arranged above the backing layer and is attached to the backing layer;
  • the matching layer is arranged above the piezoelectric layer and is attached to the piezoelectric layer;
  • the structural layer is arranged above the matching layer and is attached to the matching layer, and the structural layer includes at least one annular protrusion.
  • an embodiment of the present application also provides an ultrasonic imaging device, which includes: a connector, a catheter, and the ultrasonic transducer described in any of the embodiments of the present application; wherein,
  • the catheter is connected to the ultrasonic transducer
  • One end of the connector is connected with the catheter, and the other end is configured to be connected with the ultrasonic imaging system and the rotary retraction device.
  • Fig. 1 is a schematic structural diagram of an ultrasonic transducer in Embodiment 1 of the present application;
  • Figure 2a is a front view of an ultrasonic transducer in Embodiment 1 of the present application.
  • Figure 2b is a top view of the ultrasonic transducer shown in Figure 2a;
  • Figure 2c is a survey view of the ultrasonic transducer shown in Figure 2a;
  • Figure 3a is a front view of another ultrasonic transducer in the first embodiment of the present application.
  • Figure 3b is a top view of the ultrasonic transducer shown in Figure 3a;
  • Fig. 3c is a survey view of the ultrasonic transducer shown in Fig. 3a;
  • FIG. 4 is a schematic diagram of determining the width of the structural layer in the second embodiment of the present application.
  • FIG. 5a is a schematic diagram of a simulation of an ultrasonic transducer using related technologies in the second embodiment of the present application.
  • FIG. 5b is a schematic diagram of the simulation of the ultrasonic transducer using the embodiment of the present application in the second embodiment of the present application;
  • FIG. 6 is a schematic structural diagram of an ultrasound imaging device in Embodiment 3 of the present application.
  • FIG. 7 is a schematic cross-sectional structure diagram of the ultrasonic imaging device in the third embodiment of the present application.
  • FIG. 8 is a schematic diagram of the operation of the ultrasonic imaging device in the third embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of an ultrasonic transducer provided by Embodiment 1 of the application.
  • the ultrasonic transducer 1 includes: a backing layer 10, a piezoelectric layer 11, a matching layer 12, and a structural layer 13; Wherein, the backing layer 10 is arranged at the bottom end of the ultrasonic transducer; the piezoelectric layer 11 is arranged above the backing layer 10 and is attached to the backing layer 10; the matching layer 12 is arranged on the piezoelectric layer The upper part of 11 is attached to the piezoelectric layer 11; the structural layer 13 is arranged above the matching layer 12 and is attached to the matching layer 12.
  • the structural layer 13 includes at least one annular protrusion.
  • the backing layer 10 can be located at the bottom end of the ultrasonic transducer 1 as a substrate, and its thickness and number of layers can be set according to user requirements, which is not limited here.
  • the structure of the backing layer 10 may be a square structure as shown in FIG. 1, and may also be any other polygonal structure such as a circular structure, a triangular structure, or a star-shaped structure, which is not limited here.
  • the structure of the backing layer 10 may be a solid structure or a hollow structure, which is not limited here.
  • the material of the piezoelectric layer 11 may be piezoelectric ceramics, piezoelectric single crystals, piezoelectric composite materials, and other materials that can be used to make ultrasonic transducers.
  • the structure of the piezoelectric layer 11 may be a square structure as shown in FIG. 1, or may also be any other polygonal structure such as a circular structure, a triangular structure, or a star-shaped structure, which is not limited here.
  • the structure of the piezoelectric layer 11 may be a solid structure or a hollow structure, which is not limited here.
  • the number of piezoelectric layers 11 can also be set according to user requirements, and it is not limited here.
  • the plane where the piezoelectric layer 11 and the backing layer 10 are attached may be a square as shown in FIG.
  • the number of matching layers 12 can be one, two or more layers, and the number of matching layers 12 can be set according to user requirements, which is not limited here.
  • the structure of the matching layer 12 may be a square structure as shown in FIG. 1, and may also be any other polygonal structure such as a circular structure, a triangular structure or a star-shaped structure, which is not limited here.
  • the structure of the matching layer 12 may be a solid structure or a hollow structure, which is not limited here.
  • the plane where the piezoelectric layer 11 and the matching layer 12 are attached may be a square as shown in FIG.
  • the number of structural layers 13 may be one, two, or more than two. In this embodiment, the more the number of structural layers 13 is, the more flexible the control performance of ultrasonic sound waves is. However, in consideration of technical limitations during implementation, the number of layers of the structural layer 13 can be determined according to the size limitation of the ultrasonic transducer and the manufacturing process of the structural layer 13.
  • the structure of the structural layer 13 can also be a square structure as shown in FIG.
  • the structure of the structural layer 13 may be a solid structure or a hollow structure, which is not limited here.
  • the plane where the matching layer 12 and the structure layer 13 are attached may be a square as shown in FIG.
  • the bonding surfaces between the backing layer 10, the piezoelectric layer 11, the matching layer 12, and the structural layer 13 may have the same shape as shown in FIG. 1, or may have different shapes. It is not limited here.
  • the backing layer 10, the piezoelectric layer 11, the matching layer 12, and the structural layer 13 may all be solid structures, or all may be hollow structures, or one or more of them may be solid structures. In addition, one or more of them is a hollow structure, which is not limited here.
  • the plane on which the piezoelectric layer 11 and the backing layer 10 are attached, the plane on which the piezoelectric layer 11 and the matching layer 12 are attached, and the plane on which the matching layer 12 and the structural layer 13 are attached can be as shown in FIG. It is the same shape or different shapes, which is not limited here.
  • the structure layer 13 includes at least one annular protrusion, and the number of annular protrusions can be one, two or more, which is not limited here.
  • the annular protrusion here can control the ultrasonic sound waves, and can achieve a focusing effect similar to that of a radian focus transducer, so that the beam at the focus position of the ultrasonic sound waves is narrowed, thereby obtaining ultrasound images with high imaging resolution and clarity.
  • the structural layer 13 includes two ring-shaped protrusions, the two ring-shaped protrusions form a back-shaped structure; wherein the size of one of the two ring-shaped protrusions is larger than that of the other ring-shaped protrusion.
  • a ring-shaped protrusion with a smaller size is located in the center area of the matching layer.
  • Figure 2a is a front view of the ultrasonic transducer
  • Figure 2b is a top view of the ultrasonic transducer
  • Figure 2c is a top view of the ultrasonic transducer.
  • the structure layer 13 has two annular protrusions 131 and 132, the size of the annular protrusion 131 and the annular protrusion 132 are different, and the size of the annular protrusion 131 is smaller ,
  • the size of the annular protrusion 132 is larger, the annular protrusion 131 and the annular protrusion 132 can form a back-shaped structure, that is, the center of the annular protrusion 131 and the annular protrusion 132 are the same, and the annular protrusion 131 with a smaller size is located at a larger size.
  • the annular protrusion 131 with a smaller size is located in the central area of the matching layer 12.
  • the centers of the annular protrusion 131 and the annular protrusion 132 may be located at the center of the matching layer 12.
  • the annular protrusions 131 and the annular protrusions 132 in the structural layer 13 can control the ultrasonic sound waves, and can achieve a focusing effect similar to that of a radian focusing transducer, narrowing the beam at the focus position of the ultrasonic sound waves, thereby obtaining high imaging Resolution and clarity of ultrasound images.
  • the shapes of the annular protrusion 131 and the annular protrusion 132 may be the same or different. As an optional embodiment of the present application, both the annular protrusion 131 and the annular protrusion 132 may have a square structure. In one embodiment, the annular protrusion 131 may be a solid block structure, and the annular protrusion 132 may be a hollow block structure.
  • FIG. 2 only shows the case where the structure layer includes two ring-shaped protrusions, but it is not limited to the structure layer can only include two ring-shaped structures.
  • the ring-shaped protrusion 131 may be a hollow block structure. At least one hollow or solid annular protrusion may also be provided inside the annular protrusion 131. In an embodiment, an annular protrusion structure may also be provided between the annular protrusion 131 and the annular protrusion 132.
  • the structural layer 13 further includes strip-shaped protrusions.
  • the number of the strip-shaped protrusions can be set to an even number. And it is arranged symmetrically above the matching layer 12. For example, when the shape of the matching layer 12 is a square, the strip-shaped protrusions may be respectively disposed on the edge regions of two opposite sides of the matching layer 12.
  • the structural layer 13 includes a ring-shaped protrusion and two strip-shaped protrusions; wherein, the one ring-shaped protrusion is located in the central area of the matching layer 12, and the two strip-shaped protrusions are located in the matching layer 12. Two opposing side areas of layer 12.
  • Fig. 3a is a front view of the ultrasonic transducer
  • Fig. 3b is a top view of the ultrasonic transducer
  • Fig. 3c is Side view of the ultrasonic transducer.
  • the structure layer 13 includes an annular protrusion 134 and two strip-shaped protrusions 135.
  • the annular protrusion 134 is located in the central area of the matching layer 12, for example, it may be an annular protrusion.
  • the center of 134 is located at the center of the matching layer 12, and the two bar-shaped protrusions 135 are located at two opposite side areas of the matching layer 12.
  • the two bar-shaped protrusions 135 are located at the matching layer 12.
  • the two strip-shaped protrusions 135 may also be arranged on the upper and lower side areas of the matching layer 12, so that one ring-shaped protrusion 134 in the structural layer 13
  • two bar-shaped protrusions 135 can control the ultrasonic sound wave, can achieve a focusing effect similar to the arc focus transducer, narrow the beam at the focus position of the ultrasonic sound wave, so as to obtain high imaging resolution and sharpness. Ultrasound image.
  • FIGS. 3a, 3b, and 3c only show that the structural layer 13 includes one annular protrusion 134 and two strip-shaped protrusions 135, but it does not limit the structural layer 13 only including one annular protrusion.
  • a ring-shaped protrusion structure or a strip-shaped protrusion structure may also be provided between the ring-shaped protrusion 134 and the two strip-shaped protrusions 135.
  • Figures 2a-2c and Figures 3a-3c are two feasible structures of the structural layer 13.
  • the structures of Figures 2a-2c or Figures 3a-3c can be used.
  • Figures 2a-2c and Figures 3a-3c can be understood to mean that the convex part and the plane part of the matching layer 12 in Figures 2a-2c and Figures 3a-3c are interchanged.
  • Figure 3a -The protrusion in Figure 3c is to bulge the part of the plane of the matching layer 12 in Figure 2a- Figure 2c, and the annular protrusion 131 and the annular protrusion 132 in Figure 2a- Figure 2c are recessed to form Figure 3a- Figure 3a- Figure 2c Structure in 3c.
  • the annular protrusion has a hollow structure or a solid structure.
  • the annular protrusion may include at least one of a square protrusion, a circular protrusion, a triangular protrusion, or a star-shaped protrusion, which can be set according to user requirements without limitation.
  • the design of the annular protrusion in this embodiment mainly considers the principle of Fresnel diffraction, because the light source or the sound wave can be diffracted when the distance between the light source or the sound wave and the obstacle is finite, and the Fresnel diffraction is caused by a small hole. , Slits, etc., so when designing the annular protrusion, the annular protrusion can be designed as at least one closed square protrusion, triangular protrusion or star-shaped protrusion, etc., so that multiple square protrusions, triangular protrusions, etc.
  • Slits can be formed between annular protrusions such as star-shaped or star-shaped protrusions, which can produce Fresnel diffraction of ultrasonic sound waves.
  • the small hole can also produce Fresnel diffraction on the ultrasonic sound wave.
  • the Fresnel diffraction theorem formula (Fresnel half-band method) can be used to control the ultrasonic sound wave, which can achieve a focusing effect similar to that of a radian focusing transducer. To improve the resolution of ultrasound images.
  • the technical solutions of the embodiments of the present application design an ultrasonic transducer that not only includes a backing layer, a piezoelectric layer, and a matching layer, but also a structure that is attached to the matching layer is provided above the matching layer
  • the structure layer can control the ultrasonic sound waves generated by the ultrasonic transducer through the structure layer.
  • the structure layer includes at least one annular protrusion, the ultrasonic sound waves can be adjusted and controlled by the annular protrusion, which can achieve the same as the arc focusing transducer.
  • the similar focusing effect narrows the beam at the focal position of the ultrasound acoustic wave, thereby obtaining ultrasound images with high imaging resolution and clarity.
  • the width of the structural layer 13 is determined based on the Fresnel diffraction theorem and the wavelength and focal length of the ultrasonic sound wave of the structural layer 13.
  • the wavelength of the ultrasonic sound wave is related to the material used in the structural layer 13 and the frequency of the ultrasonic sound wave emitted by the ultrasonic transducer.
  • the frequency of the ultrasonic sound wave emitted by the ultrasonic transducer is generally 20-100MHz.
  • the material used for the structural layer 13 It can be a resin material, acrylic material, rubber material, organic silicon material or photoresist and other materials with similar acoustic parameters.
  • the focal length here is related to practical applications. For example, intravascular ultrasound mainly detects objects in the 1mm-3mm area of the front end of the ultrasound transducer, because the blood vessel wall is probably in the area 1mm-3mm of the front end of the ultrasound transducer, so in general, you can The focal length is set to 2mm.
  • the ultrasonic transducer can focus the ultrasonic sound wave on the preset position (for example, the focal length 2mm position) to form a focal point:
  • R n represents the width of the nth Fresnel zone (ie R 1 , R 2 , R 3 and R 4 in Figure 4 );
  • ⁇ represents the wavelength of the ultrasonic sound wave emitted by the ultrasonic transducer;
  • F represents the ultrasonic sound wave Focal length;.
  • the width of the annular protrusion and the slit between the annular protrusion in FIG. 4 can be determined based on the following formula:
  • ⁇ is the wavelength of the ultrasonic sound wave in the structural layer 13
  • F is the focal length of the ultrasonic sound wave.
  • the width of the structural layer 13 can be determined.
  • the annular protrusion of the structural layer 13 can be designed based on the determined width of the structural layer 13.
  • the similar focusing effect of the energy device narrows the beam at the focal position of the ultrasound acoustic wave, thereby obtaining ultrasound images with high imaging resolution and clarity.
  • the thickness of the structural layer 13 is based on the wavelength of the ultrasonic sound wave, the first propagation speed of the ultrasonic sound wave in water, the second propagation speed of the ultrasonic sound wave in the structural layer 13, and the distance through the matching layer 12 The phase difference between the ultrasonic sound wave and the ultrasonic sound wave passing through the structural layer 13 is determined.
  • the first propagation speed may be the propagation speed of ultrasonic sound waves in water
  • the second propagation speed may be the propagation speed of ultrasonic sound waves in the structural layer 13
  • the first propagation speed, the second propagation speed of the ultrasonic sound wave in the structural layer 13, and the phase difference between the ultrasonic sound wave passing through the matching layer 12 and the ultrasonic sound wave passing through the structural layer 13 are as follows: Then the thickness of the structural layer 13 can be determined:
  • c 0 is the first propagation speed of ultrasonic sound waves
  • c 1 is the second propagation speed of ultrasonic sound waves
  • h is the thickness of the structural layer 13 It is the phase difference between the ultrasonic sound wave passing through the matching layer 12 and the ultrasonic sound wave passing through the structural layer 13.
  • the structural layer 13 of the ultrasonic transducer can realize the phase adjustment of the ultrasonic sound waves.
  • the ultrasonic sound waves passing through the matching layer 12 are ultrasonic sound waves that have not been adjusted, and the ultrasonic sound waves passing through the structural layer 13 are adjusted.
  • the structural layer realizes that the waveform of the ultrasonic sound wave is delayed by a quarter of a period, that is, when At this time, the structural layer has the best effect on regulating the focusing of ultrasonic sound waves.
  • the thickness of the structural layer 13 is determined, so that based on the determined thickness of the structural layer 13, the annular protrusion of the structural layer 13 can be designed, and the ultrasonic sound wave can be adjusted and controlled by the annular protrusion, which can achieve the arc focusing and transduction.
  • the similar focusing effect of the sensor narrows the beam at the focal position of the ultrasonic sound wave, thereby obtaining an ultrasonic image with high imaging resolution and clarity.
  • the acoustic impedance of the structural layer 13 is determined based on the material density of the material of the structural layer 13 and the first propagation velocity, and the acoustic impedance of the structural layer 13 is located between the acoustic impedance of water and the acoustic impedance of the matching layer 12.
  • the material density of the material, c is the first propagation speed, that is, the propagation speed of ultrasonic sound waves in water.
  • the acoustic impedance of the structural layer 13 is located between the acoustic impedance of water and the acoustic impedance of the matching layer 12, for example, it can be Z water ⁇ Z structure layer ⁇ Z matching layer .
  • the annular protrusions on the structural layer 13 can be designed according to the acoustic impedance of the structural layer 13, and the ultrasonic sound waves can be controlled by the annular protrusions, which can achieve a focusing effect similar to that of a radian focusing transducer, so that the beam at the focus position of the ultrasonic sound wave can be changed. Narrow, so as to obtain ultrasound images with high imaging resolution and clarity.
  • the thickness of the piezoelectric layer 11 is half of the wavelength of the ultrasonic sound wave of the piezoelectric layer 11. The wavelength of the ultrasonic sound wave of the piezoelectric layer 11 is divided by the speed of the ultrasonic sound wave in the piezoelectric layer 11 by the ultrasonic wave. The frequency of the energy device is obtained.
  • the wavelength of the ultrasonic sound wave of the piezoelectric layer 11 is obtained by dividing the sound velocity of the piezoelectric layer 11 by the frequency of the ultrasonic transducer.
  • the sound velocity of the ultrasonic sound wave in the piezoelectric layer 11 can be divided by the frequency of the ultrasonic transducer to obtain the wavelength of the ultrasonic sound wave of the piezoelectric layer 11, and then half of the wavelength of the ultrasonic sound wave is taken as the pressure The thickness of the electrical layer 11.
  • the thickness of the matching layer 12 is a quarter of the wavelength of the ultrasonic sound wave of the matching layer 12, wherein the wavelength of the ultrasonic sound wave of the matching layer 12 is divided by the sound velocity of the ultrasonic sound wave in the matching layer 12 by the ultrasonic transducer. The frequency of the device is obtained.
  • the wavelength of the ultrasonic sound wave of the matching layer 12 is obtained by dividing the sound velocity of the ultrasonic sound wave in the matching layer 12 by the frequency of the ultrasonic transducer.
  • the sound velocity of the ultrasonic sound wave in the matching layer 12 can be divided by the frequency of the ultrasonic transducer to obtain the wavelength of the ultrasonic sound wave of the matching layer 12, and then a quarter of the wavelength of the ultrasonic sound wave is taken as Match the thickness of layer 12.
  • the frequency of the ultrasonic transducer is the frequency of ultrasonic sound waves.
  • the thickness of the piezoelectric layer 11 and the thickness of the matching layer 12 determined in the above embodiments make it possible to focus the ultrasonic sound waves emitted by the ultrasonic transducer at a preset position even if part of the annular protrusions in the structural layer 13 are missing.
  • a focal point can achieve a focusing effect similar to that of a radian focusing transducer, which narrows the beam at the focal position of the ultrasonic acoustic wave, thereby obtaining an ultrasonic image with high imaging resolution and clarity.
  • the finite element software COMSOL is used to simulate the ultrasonic transducer in the embodiment of the application.
  • the planar ultrasonic transducer of the related art and the ultrasonic transducer of the embodiment of the present application are obtained respectively A focus map generated at a preset position directly in front of, where Fig. 5a is a focal point generated by a planar ultrasonic transducer of the related art, and Fig.
  • 5b is a focal point generated by an ultrasonic transducer according to an embodiment of the application.
  • the annular protrusion of the embodiment of the present application can control the ultrasonic sound wave, and can achieve a focusing effect similar to that of a radian focusing transducer, so that the beam at the focus position of the ultrasonic sound wave is narrowed, thereby obtaining high imaging resolution. And clarity of ultrasound images.
  • the width of the structural layer 13 is determined based on the Fresnel diffraction theorem and the wavelength and focal length of the ultrasonic wave of the structural layer 13, so that the annular convexity of the structural layer 13 can be designed based on the determined width of the structural layer 13
  • the ultrasonic sound wave is adjusted through the annular protrusion, which can achieve a focusing effect similar to the arc focus transducer, so that the beam at the focus position of the ultrasonic sound wave is narrowed, so as to obtain an ultrasonic image with high imaging resolution and clarity.
  • the thickness of the structural layer 13 is based on the wavelength of the ultrasonic sound wave, the first propagation speed of the ultrasonic sound wave in water, the second propagation speed of the ultrasonic sound wave in the structural layer 13, and the ultrasonic sound wave passing through the matching layer 12
  • the phase difference with the ultrasonic sound wave passing through the structural layer 13 is determined, so that the annular protrusion of the structural layer can be designed based on the thickness of the determined structural layer, and the ultrasonic sound wave can be adjusted and controlled by the annular protrusion to achieve the arc focus.
  • the similar focusing effect of the transducer narrows the beam at the focal position of the ultrasound acoustic wave, thereby obtaining ultrasound images with high imaging resolution and clarity.
  • the acoustic impedance of the structural layer 13 is determined based on the material density of the material of the structural layer 13 and the first propagation velocity.
  • the acoustic impedance of the structural layer 13 is located between the acoustic impedance of water and the acoustic impedance of the matching layer 12.
  • the annular bulge on the structural layer of the acoustic impedance design of the acoustic impedance design, through the annular bulge to adjust the ultrasonic sound wave, can achieve a focusing effect similar to the arc focus transducer, so that the beam at the focus position of the ultrasonic sound wave is narrowed, so as to obtain high imaging Resolution and clarity of ultrasound images.
  • the thickness of the piezoelectric layer 11 is half the wavelength of the ultrasonic sound wave of the piezoelectric layer 11, wherein the wavelength of the ultrasonic sound wave of the piezoelectric layer 11 is divided by the sound velocity of the ultrasonic sound wave in the piezoelectric layer 11 by the ultrasonic transducer
  • the frequency is obtained
  • the thickness of the matching layer 12 is one-fourth of the wavelength of the ultrasonic sound wave of the matching layer 12, wherein the wavelength of the ultrasonic sound wave of the matching layer 12 is divided by the sound velocity of the ultrasonic sound wave in the matching layer 12 by the ultrasonic transducer.
  • the frequency of the transducer is obtained, so that even if part of the annular bulge in the structural layer 13 is missing, the ultrasonic sound waves emitted by the ultrasonic transducer can be focused into a focal point at a preset position, which can achieve a similarity to that of a radian focusing transducer.
  • the focusing effect narrows the beam at the focal position of the ultrasound acoustic wave, thereby obtaining ultrasound images with high imaging resolution and clarity.
  • FIG. 6 is a schematic structural diagram of an ultrasonic imaging device provided in Embodiment 3 of the application.
  • the ultrasonic imaging device includes: a connector 3, a catheter 2 and the ultrasonic transducer described in any of the embodiments of the application 1; Among them, the catheter 2 is connected to the ultrasonic transducer 1; the connector 3, one end is connected to the catheter 2, and the other end is set to be connected to the ultrasonic imaging system and the rotary retraction device.
  • one end of the connector 3 is electrically connected to the catheter 2, and the other end is electrically connected to the ultrasound imaging system and mechanically connected to the rotary retractor.
  • a metal hose 21 and a coaxial cable 22 are provided inside the catheter 2; wherein, the metal hose 21 is a spiral with a cavity.
  • a coaxial cable 22, which penetrates the cavity of the metal hose 21, is electrically connected to the ultrasonic transducer 1 at one end, and is electrically connected to the connector 3 at the other end.
  • a positioning module may be provided in the catheter 2, and the positioning module is configured to position the ultrasound transducer 1 so as to guide the ultrasound transducer 1 to move to the tube wall where the disease is located and where the atherosclerotic plaque is located. s position.
  • a water injection port 31 may be further provided on the connector 3, and the water injection port 31 may be used to inject water into the ultrasonic imaging device.
  • 100 is a blood vessel
  • B1 is a normal blood vessel diagram
  • B2 is a blood vessel diagram with atherosclerotic plaques.
  • the ultrasound imaging device provided in this embodiment of the application can be used For intravascular ultrasound work, the ultrasound transducer installed at the tip of the catheter is inserted into the suspected lesion in the human blood vessel for two-dimensional tissue imaging. Not only can the shape of the inner wall of the blood vessel be displayed in real time, but also the tissue plane analysis and three-dimensional reconstruction can be used Measuring the size of lesions provides a new perspective for in-depth understanding of the shape and function of vascular lesions, and at the same time provides more accurate and reliable information for clinical diagnosis and treatment.
  • the ultrasound imaging device based on intravascular ultrasound technology, in addition to displaying the luminal shape and blood vessel wall information, it can also preliminarily determine the histomorphological characteristics of atherosclerotic plaques, and at the same time, measure the diameter of blood vessels through accurate quantitative analysis. , Cross-sectional area and degree of stenosis, can identify early atherosclerotic lesions that cannot be detected by angiography, such as critical lesions displayed by angiography. Using this ultrasound imaging device, based on intravascular ultrasound technology, atherosclerotic lesions can be detected Precise quantitative analysis to determine the degree of atherosclerotic lesion stenosis and the type of lesion to assist in the selection of clinical treatment options.
  • the ultrasound imaging device based on intravascular ultrasound technology, it also has very important application value in guiding coronary interventional therapy. Because this technology can accurately reflect the internal morphology of the blood vessel, the nature and severity of the disease, and so on, so as to provide a basis for choosing the right treatment strategy, such as choosing a stent of the right size.
  • the ultrasound imaging device based on intravascular ultrasound technology, it can be used to evaluate the effect of postoperative stent treatment, such as whether the stent is fully expanded, whether it is completely attached to the wall, whether it is uniformly expanded and completely covered the disease, etc., which is beneficial to timely detection and correction of the stent
  • the ultrasonic imaging device provided in the embodiment of the present application includes the ultrasonic transducer provided in any embodiment of the present application.
  • the ultrasound imaging device provided in the embodiments of the present application improves the resolution and clarity of intravascular ultrasound imaging of the ultrasound imaging device in the related art, and can obtain better image resolution and clarity.

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  • Transducers For Ultrasonic Waves (AREA)

Abstract

Transducteur ultrasonore et appareil d'imagerie ultrasonore. Le transducteur ultrasonore (1) comprend une couche de support (10), une couche piézoélectrique (11), une couche d'adaptation (12) et une couche structurale (13). La couche de support (10) est disposée au niveau de l'extrémité inférieure du transducteur ultrasonore, la couche piézoélectrique (11) est disposée au-dessus de la couche de support (10) et fixée à la couche de support (10), la couche d'adaptation (12) est disposée au-dessus de la couche piézoélectrique (11) et fixée à la couche piézoélectrique (11), la couche structurale (13) est disposée au-dessus de la couche d'adaptation (12) et fixée à la couche d'adaptation (12) et la couche structurale (13) comprend au moins une saillie annulaire. L'appareil d'imagerie ultrasonore comprend un connecteur (3), un cathéter (2) et le transducteur ultrasonore (1).
PCT/CN2020/103678 2020-04-03 2020-07-23 Transducteur ultrasonore et appareil d'imagerie ultrasonore WO2021196455A1 (fr)

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