CN113414089B - Non-focusing sound field enhanced transducer - Google Patents

Abstract

The invention discloses a non-focusing sound field enhancement transducer, which comprises 3 transducers arranged in a star shape: a first transducer, a second transducer, and a third transducer; the included angle between the first energy converter and the second energy converter is theta 1, the included angle between the second energy converter and the third energy converter is theta 2, the included angle between the first energy converter and the third energy converter is theta 3, and all of theta 1, theta 2 and theta 3 are 15 degrees to 165 degrees. The invention obtains an enhanced sound field through superposition of three transducers, and the spatial position of the spatially superposed sound field can be adjusted by changing the spatial angle of the transducers; the three transducers are used for combining single-sided emission and double-sided emission, so that the purpose of controlling the radiation direction of a sound field can be realized, and the action range of the sound field can be enlarged, so that the device is applied to specific treatment occasions; by configuring the frequencies of the three transducers, three spatially distributed enhanced mixing sound fields can be obtained; the invention has the advantages of small overall size and capability of being used for tissue interventional therapy.

Description

Non-focused sound field enhancement transducer

technical field

The invention relates to the technical field of ultrasonic transducers, in particular to a non-focused sound field enhancement transducer.

Background technique

Ultrasonic transducers are the core components of medical ultrasonic diagnosis and treatment equipment. At present, transducers that use ultrasonic mechanical effects, thermal effects, and physical and chemical effects for ablation therapy are mostly focusing transducers. The lens method gathers the radiated energy of the transducer to enhance the ultrasonic energy at a certain position in the space. Its advantages are small energy gathering point, high energy density, focus and focal length can be changed through structural design; however, the transducer used for ablation therapy The transducer is usually a low-frequency transducer, and the focusing transducer is designed to be bulky and heavy. For example, the diameter of a 1MHz HIFU ultrasound probe is about 7cm, which cannot meet the clinical requirements for interventional therapy with an overall size of 2mm or even 1mm, and small and light weight. The demand for wearable medical equipment; in addition, the focused ultrasound probe focuses the energy to a specific small area, it is difficult to radiate a large area, and cannot meet certain specific large-area ultrasound radiation therapy scenarios. The size of the single-array high-frequency ultrasonic transducer is small, and the ultrasonic transducer can be sent to the targeted area through the interventional catheter to directly act on the target tissue. However, the small volume of high-frequency ultrasound makes it difficult to radiate strong ultrasound. The energy cannot reach the energy threshold required for ablation tissue.

In order to meet the requirements of clinical interventional ablation therapy and in vitro wearable medical ultrasound equipment, the invention proposes to design a technical scheme based on multiple ultrasonic transducers forming a radiation sound field superimposed and enhanced by a certain angle. .

Contents of the invention

The technical problem to be solved by the present invention is to provide a non-focused sound field enhancement transducer for the above-mentioned deficiencies in the prior art.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a non-focused sound field enhancement transducer, including three transducers arranged in a star shape: the first transducer, the second transducer and the second transducer Three transducers;

The included angle between the first transducer and the second transducer is θ1, the included angle between the second transducer and the third transducer is θ2, and the first transducer and the third transducer are The included angle between the third transducers is θ3, θ1, θ2 and θ3 are all 15°-165°, and θ1+θ2+θ3=360°.

The first transducer, the second transducer and the third transducer are arranged at a certain angle, and the intersection of the radiation direction between the two transducers is enhanced due to the superposition of the sound field (that is, the sound field enhancement area), through By changing the spatial angle between the transducers, the spatial position of the spatially superimposed sound field (that is, the sound field enhancement area) can be adjusted.

Preferably, the first transducer, the second transducer and the third transducer can all be single-sided or double-sided emitting transducers. Through the combination of single-sided emission and double-sided emission by three transducers, the purpose of controlling the radiation direction of the sound field can be achieved, so as to be applied to specific treatment occasions. For example, when the first transducer, the second transducer and the third transducer all emit from two sides, the sound field enhancement region can be obtained in the three regions between any two of the three transducers. At this time, not only the purpose of enhancing the sound field is achieved, but also the scope of the sound field is increased, and three spatially distributed enhanced sound fields with radiation directions perpendicular to each other can be obtained.

Preferably, the first transducer includes a first working layer, the second transducer includes a second working layer, and the third transducer includes a third working layer.

Preferably, a first matching layer is also provided on the front side of the first working layer.

Preferably, the back of the first working layer is further provided with a first backing layer.

Preferably, a second matching layer is further provided on the front side of the second working layer.

Preferably, a second backing layer is further provided on the back of the second working layer.

Preferably, a third matching layer is further provided on the front side of the third working layer.

Preferably, a third backing layer is further provided on the back of the third working layer.

Preferably, the center frequencies of the first transducer, the second transducer and the third transducer are respectively f1, f2 and f3, and all of f1, f2 and f3 are between 1-30 MHz. And f1, f2, and f3 can be equal or not. When f1, f2, and f3 are not equal at the same time, an enhanced mixed-frequency sound field can be obtained in the sound field superimposition area, which can be applied to mixed-frequency interventional ablation therapy at different depths, and the low frequency can be obtained. The higher the penetration depth, the better the effect on deep tissue; the high and low frequency superposition area can obtain better therapeutic effect.

Preferably, θ1, θ2 and θ3 are all 120°.

Preferably, the materials of the first, second and third working layers can all be piezoelectric ceramics, piezoelectric composite materials, piezoelectric single crystals or thin film materials.

Preferably, the first, second and third matching layers can all be multi-layer matching structures.

Preferably, the first, second and third backing layers can all be wavy or inclined.

The beneficial effects of the present invention are: the non-focused sound field enhancement transducer of the present invention obtains the enhanced sound field through the superposition of three transducers, and the spatial position of the spatially superimposed sound field can be adjusted by changing the spatial angle of the transducers; The combination of single-sided emission and double-sided emission of the transducer can achieve the purpose of controlling the radiation direction of the sound field, and at the same time increase the range of the sound field to apply to specific treatment occasions; by configuring the frequencies of the three transducers, It can also obtain three spatially distributed enhanced mixing sound fields, which can be applied to different depths of mixed frequency interventional ablation therapy. Combining the respective advantages of low frequency and high frequency can obtain better therapeutic effects; the size of the three transducers is small, The overall size of the present invention can be miniaturized, compared with the traditional focusing transducer, the overall size can be greatly reduced, and at the same time, it can provide ultrasonic energy that can meet the treatment intensity, so that it can be used for tissue interventional treatment.

Description of drawings

Fig. 1 is a schematic structural view of a non-focused sound field enhancement transducer in Embodiment 1 of the present invention (the left side is a plan view, and the right side is a perspective view);

FIG. 2 is a simulation result diagram of the spatial absolute sound pressure distribution of the non-focused sound field enhancement transducer in Embodiment 1 of the present invention;

3 is a schematic structural view of the non-focused sound field enhancement transducer in Embodiment 2 of the present invention (the left side is a plan view, and the right side is a perspective view);

FIG. 4 is a simulation result diagram of the spatial absolute sound pressure distribution of the non-focused sound field enhancement transducer in Embodiment 2 of the present invention;

5 is a schematic structural view of the non-focused sound field enhancement transducer in Embodiment 3 of the present invention (the left side is a top view, and the right side is a perspective view);

FIG. 6 is a simulation result diagram of the spatial absolute sound pressure distribution of the non-focused sound field enhancement transducer in Embodiment 3 of the present invention;

7 is a schematic structural view of the non-focused sound field enhancement transducer in Embodiment 4 of the present invention (the left side is a top view, and the right side is a perspective view);

FIG. 8 is a simulation result diagram of the spatial absolute sound pressure distribution of the non-focused sound field enhancement transducer in Embodiment 4 of the present invention;

Fig. 9 is a schematic structural diagram of a non-focused sound field enhancement transducer in Embodiment 5 of the present invention;

Explanation of reference signs:

1—the first transducer; 2—the second transducer; 3—the third transducer; 11—the first matching layer; 12—the first working layer; 13—the first backing layer; 21—the second Matching layer; 22—second working layer; 23—second backing layer; 31—third matching layer; 32—third working layer; 33—third backing layer.

Detailed ways

The present invention will be further described in detail below in conjunction with the embodiments, so that those skilled in the art can implement it with reference to the description.

It should be understood that terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

Example 1

As shown in Figure 1, a non-focused sound field enhancement transducer of the present embodiment includes 3 transducers arranged in a star shape (as shown in the top view on the left side of Fig. 1 ): the first transducer 1, the second transducer The second transducer 2 and the third transducer 3;

The first transducer 1 comprises a first working layer 12, a first matching layer 11 arranged on the front side of the first working layer 12 and a first backing layer 13 arranged on the back side of the first working layer 12; the second transducer The device 2 includes a second working layer 22, a second matching layer 21 arranged on the front of the second working layer 22, and a second backing layer 23 arranged on the back of the second working layer 22; the third transducer 3 includes a second Three working layers 32 , a third matching layer 31 arranged on the front of the third working layer 32 and a third backing layer 33 arranged on the back of the third working layer 32 .

Wherein, the materials of the first, second and third working layers (12, 22, 32) can all be piezoelectric ceramics, piezoelectric composite materials, piezoelectric single crystals or film materials. The first, second and third working layers (12, 22, 32) can all be single-layer working layer structures, or multi-layer working layer structures.

Wherein, the first, second and third matching layers (11, 21, 31) can all be single-layer matching structures, or can be multi-layer matching structures.

Wherein, the first, second and third backing layers (13, 23, 33) can all be wavy or inclined.

Wherein, the included angle between the first transducer 1 and the second transducer 2 is θ1, the included angle between the second transducer 2 and the third transducer 3 is θ2, and the first transducer 1 The included angle with the third transducer 3 is θ3, θ1, θ2 and θ3 are all 15°-165°, and θ1+θ2+θ3=360°.

Wherein, the center frequencies of the first transducer 1, the second transducer 2 and the third transducer 3 are respectively f1, f2 and f3, and f1, f2 and f3 are all between 1-30 MHz.

In this embodiment, the first transducer 1, the second transducer 2, and the third transducer 3 are all unidirectionally emitting back-to-back weakly scattered sound field signals, and the spatial sound field is between the first transducer 1 and the second transducer. Superposition enhancement is obtained at the intersection of the radiation direction of the transducer 2, and superposition enhancement is obtained at the intersection of the second transducer 2’s back direction and the third transducer’s 3 forward radiation direction. This embodiment can simultaneously enhance the sound field And the role of increasing the range of the sound field, can obtain the spatial distribution of the sound field with radiation directions perpendicular to each other. By changing the spatial angle of the transducer, the spatial position of the spatially superimposed sound field can be adjusted.

In a further preferred embodiment, θ1, θ2 and θ3 are all 120°, and the frequencies of the three transducers are all the same; refer to FIG. 2 , which is a simulation result diagram of the spatial absolute sound pressure distribution in this embodiment.

It should be understood that the

Example 2

This embodiment is mostly the same as Embodiment 1, and only the differences are described below.

Referring to FIG. 3 , in this embodiment, the main difference from Embodiment 1 is that the first transducer 1 , the second transducer 2 and the third transducer 3 do not include a backing layer. In this embodiment, the first transducer 1, the second transducer 2 and the third transducer 3 all emit in one direction, and there are scattered sound field signals in the back, and the spatial sound field is between the first transducer 1 and the second transducer. Superposition enhancement is obtained at the intersection of the radiation direction of the transducer 2, and superposition enhancement is obtained at the intersection of the second transducer 2’s back direction and the third transducer’s 3 forward radiation direction. This embodiment can also play a role of enhancement at the same time The sound field and the function of increasing the range of the sound field can obtain a spatially distributed sound field with radiation directions perpendicular to each other. In a further preferred embodiment, θ=120°, the center frequencies of the first transducer 1, the second transducer 2 and the third transducer 3 are all the same; with reference to Fig. 4, it is the spatial absolute Simulation results of sound pressure distribution.

Example 3

This embodiment is mostly the same as Embodiment 1, and only the differences are described below.

Referring to Fig. 5, in this embodiment, the main difference from Embodiment 1 is that the first transducer 1, the second transducer 2 and the third transducer 3 do not include a backing layer and a matching layer, This means that each has only working layers. In this embodiment, the first transducer 1, the second transducer 2, and the third transducer 3 all transmit sound field signals bidirectionally, and the spatial sound field is at the intersection of the radiation directions between the three transducers. To obtain superposition enhancement, this embodiment can play the role of three enhanced sound fields at the same time, and can obtain three spatially distributed enhanced sound fields with the included angle θ in the radiation direction. In a further preferred embodiment, θ=120°, the center frequencies of the first transducer 1, the second transducer 2 and the third transducer 3 are all the same; with reference to Fig. 6, it is the spatial absolute frequency in this embodiment Simulation results of sound pressure distribution.

Example 4

This embodiment is mostly the same as Embodiment 3, and only the differences are described below.

Referring to Fig. 7, in this embodiment, the difference from Embodiment 1 mainly lies in that the center frequencies of the first, second and third transducers 3 are respectively f1, f2, f3, and f1, f2, f3 Not the same at the same time. In this embodiment, the first transducer 1, the second transducer 2 and the third transducer 3 all transmit sound field signals bidirectionally, and the spatial sound field is between the first transducer 1, the second transducer 2 and the third transducer The intersection of the radiation directions of the three transducers 3 is superimposed and enhanced. This embodiment can simultaneously play the role of three enhanced mixing sound fields, and can obtain three spatially distributed enhanced mixing sound fields with an angle of θ between the radiation directions, which can be used. Applied to different depths of mixed-frequency interventional ablation therapy, low-frequency can obtain a higher penetration depth and effect on deep tissues, and high-low frequency superposition areas can obtain better therapeutic effects. In a further preferred embodiment, θ=120°; refer to FIG. 8 , which is a simulation result diagram of the spatial absolute sound pressure distribution in this embodiment.

Example 5

In this embodiment, one of the three transducers also has an imaging function. Referring to FIG. 9, the first transducer 1 and the second transducer 2 obtain a superimposed and enhanced sound field at the intersection of the radiation direction below. The three transducers 3 have imaging functions. When in use, treatment is performed through the enhanced sound field obtained by the first transducer 1 and the second transducer 2, and then by rotating 180°, the third transducer 3 is used to combine necessary external Ultrasound imaging equipment images the treatment site, so that the treatment effect of the treatment site can be observed in real time.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the use listed in the specification and implementation, it can be applied to various fields suitable for the present invention, and it can be easily understood by those skilled in the art Therefore, the invention is not limited to the specific details without departing from the general concept defined by the claims and their equivalents.

Claims (10)

1. A non-focused sound field enhanced transducer comprising 3 transducers arranged in a star configuration: a first transducer, a second transducer, and a third transducer; the included angle between the first energy converter and the second energy converter is theta 1, the included angle between the second energy converter and the third energy converter is theta 2, and the included angle between the first energy converter and the third energy converter is theta 3, theta 1,

θ2 and θ3 are both 15 ° -165 °, and θ1+θ2+θ3=360°;

the first transducer comprises a first working layer, the second transducer comprises a second working layer, and the third transducer comprises a third working layer;

the working layers of any two transducers of the first transducer, the second transducer and the third transducer are arranged in an intersecting manner on the surface.

2. The non-focused sound field enhanced transducer of claim 1 wherein the front side of the first working layer is further provided with a first matching layer.

3. The non-focused sound field enhanced transducer of claim 1 or 2, wherein the back side of the first working layer is further provided with a first backing layer.

4. The non-focused sound field enhanced transducer of claim 1 wherein the front side of the second working layer is further provided with a second matching layer.

5. The non-focused sound field enhanced transducer of claim 1 or 4 wherein the back side of the second working layer is further provided with a second backing layer.

6. The non-focused sound field enhanced transducer of claim 1 wherein the front side of the third working layer is further provided with a third matching layer.

7. The non-focused sound field enhanced transducer of claim 1 or 6, wherein the back side of the third working layer is further provided with a third backing layer.

8. The unfocused sound field enhancement transducer of claim 1, wherein the first, second and third transducers have center frequencies f1, f2, f3, respectively, f1, f2, f3 each being between 1-30 MHz.

9. The unfocused sound field enhanced transducer of claim 1, wherein θ1, θ2 and θ3 are each 120 °.

10. The unfocused sound field enhancement transducer of claim 1, wherein one of the three transducers is an imaging transducer and the other two of the three transducers are therapy transducers.

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