CN113414089B - Non-focusing sound field enhanced transducer - Google Patents
Non-focusing sound field enhanced transducer Download PDFInfo
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- CN113414089B CN113414089B CN202110711455.4A CN202110711455A CN113414089B CN 113414089 B CN113414089 B CN 113414089B CN 202110711455 A CN202110711455 A CN 202110711455A CN 113414089 B CN113414089 B CN 113414089B
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- 238000002560 therapeutic procedure Methods 0.000 claims abstract description 3
- 238000003384 imaging method Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 abstract description 17
- 238000011282 treatment Methods 0.000 abstract description 14
- 239000010410 layer Substances 0.000 description 54
- 230000000694 effects Effects 0.000 description 9
- 238000004088 simulation Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000011298 ablation treatment Methods 0.000 description 5
- 230000002708 enhancing effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 238000010317 ablation therapy Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000000338 in vitro Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000012285 ultrasound imaging Methods 0.000 description 1
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Classifications
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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
- B06B1/0607—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 using multiple elements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N7/00—Ultrasound therapy
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
Technical Field
The invention relates to the technical field of ultrasonic transducers, in particular to a non-focusing sound field enhanced transducer.
Background
The ultrasonic transducer is a core device of medical ultrasonic diagnosis and treatment equipment, and the ultrasonic mechanical effect, the thermal effect and the physicochemical effect are used for carrying out ablation treatment at present, and most of ultrasonic transducers are focusing transducers, and the ultrasonic energy of the ultrasonic transducer is gathered by a concave structural design or a method of adding an acoustic lens, so that the ultrasonic energy of a certain position in space is enhanced; however, the transducer for ablation therapy is usually a low-frequency transducer, the design volume of the focusing transducer is larger and heavier, for example, the diameter of a 1MHz HIFU ultrasonic probe is about 7cm, and the requirement of the interventional therapy field which clinically requires the whole size of 2mm or even 1mm and the requirement of small and light wearable medical equipment cannot be met; in addition, the focused ultrasound probe focuses energy into a specific small area, so that a larger area is difficult to radiate, and certain specific large-area ultrasound radiation treatment scenes cannot be met. The size of the single-array element high-frequency ultrasonic transducer is smaller, the ultrasonic transducer can be sent to a target area through an interventional catheter to directly act on target tissues, however, the high-frequency ultrasonic has smaller volume, strong ultrasonic energy is difficult to radiate, and the energy threshold required by tissue ablation cannot be reached.
In order to meet the requirements of clinical interventional ablation treatment and in-vitro wearable medical ultrasonic equipment on high radiation energy of tiny transducers, the invention provides a technical scheme for forming radiation sound fields through a certain angle based on a plurality of ultrasonic transducers to mutually overlap and strengthen.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a non-focusing sound field enhancement transducer aiming at the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme: a non-focused sound field enhanced transducer comprising 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, theta 1, theta 2 and theta 3 are 15 degrees to 165 degrees, and theta1+theta2+theta3=360 degrees.
The first transducer, the second transducer and the third transducer are arranged at a certain angle, the intersection of the radiation directions of the two transducers is enhanced due to sound field superposition (namely, a sound field enhancement region), and the spatial position of the spatially superposed sound field (namely, the sound field enhancement region) can be adjusted by changing the spatial angle between the transducers.
Preferably, the first transducer, the second transducer and the third transducer may each be a single-sided or double-sided emitting transducer. The three transducers are used for single-sided emission and double-sided emission, so that the purpose of controlling the radiation direction of the sound field can be realized, and the device is applied to specific treatment occasions. For example, when the first transducer, the second transducer, and the third transducer are each double-sided transmitting, a sound field enhancement region can be obtained in three regions between each of the three transducers. At the moment, the purpose of enhancing the sound field is achieved, the action range of the sound field is enlarged, and three spatial distribution enhanced sound fields with mutually perpendicular radiation directions can be obtained.
Preferably, 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.
Preferably, the front surface of the first working layer is further provided with a first matching layer.
Preferably, the back surface of the first working layer is further provided with a first backing layer.
Preferably, the front surface of the second working layer is further provided with a second matching layer.
Preferably, the back surface of the second working layer is further provided with a second backing layer.
Preferably, the front surface of the third working layer is further provided with a third matching layer.
Preferably, the back surface of the third working layer is further provided with a third backing layer.
Preferably, the center frequencies of the first transducer, the second transducer and the third transducer are f1, f2 and f3 respectively, and the frequencies of f1, f2 and f3 are all between 1 and 30 MHz. And f1, f2 and f3 can be equal or unequal, when f1, f2 and f3 are different and equal, an enhanced mixing sound field can be obtained in a sound field superposition area, the device can be applied to mixing interventional ablation treatment with different depths, higher penetration depth can be obtained at low frequency, and the effect on deep tissues is good; the high-low frequency superposition area can obtain better treatment effect.
Preferably, θ1, θ2, and θ3 are all 120 °.
Preferably, the materials of the first, second and third working layers may be piezoelectric ceramics, piezoelectric composite materials, piezoelectric single crystals or thin film materials.
Preferably, each of the first, second and third matching layers may be a multilayer matching structure.
Preferably, each of the first, second and third backing layers may be wavy or sloped.
The beneficial effects of the invention are as follows: according to the non-focusing sound field enhancement transducer, an enhancement sound field is obtained through superposition of three transducers, and the spatial position of the spatially superposed sound field can be adjusted through 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 to be applied to specific treatment occasions; by configuring the frequencies of the three transducers, three spatial distribution enhanced mixing sound fields can be obtained, the method can be applied to mixing interventional ablation treatment with different depths, and better treatment effect can be obtained by combining the advantages of low frequency and high frequency; the three transducers have smaller sizes, so that the whole size of the invention can be miniaturized, compared with the traditional focusing transducer, the whole size can be greatly reduced, and simultaneously, ultrasonic energy meeting the treatment intensity can be provided, thereby being applicable to tissue interventional treatment.
Drawings
Fig. 1 is a schematic structural view of a non-focused sound field enhancement transducer in embodiment 1 of the present invention (top view on left side, perspective view on right side);
FIG. 2 is a graph showing simulation results of the spatial absolute sound pressure distribution of the unfocused sound field enhanced transducer according to embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a non-focused sound field enhancement transducer in embodiment 2 of the present invention (top view on left side, perspective view on right side);
FIG. 4 is a graph showing simulation results of the spatial absolute sound pressure distribution of the unfocused sound field enhanced transducer according to embodiment 2 of the present invention;
fig. 5 is a schematic structural view of a non-focused sound field enhancement transducer in embodiment 3 of the present invention (top view on left side, perspective view on right side);
FIG. 6 is a graph showing simulation results of the spatial absolute sound pressure distribution of the unfocused sound field enhanced transducer in example 3 of the present invention;
fig. 7 is a schematic structural diagram of a non-focused sound field enhancement transducer in embodiment 4 of the present invention (top view on left side, perspective view on right side);
FIG. 8 is a graph showing simulation results of the spatial absolute sound pressure distribution of the unfocused sound field enhanced transducer in example 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;
reference numerals illustrate:
1-a first transducer; 2-a second transducer; 3-a third transducer; 11-a first matching layer; 12-a first working layer; 13-a first backing layer; 21-a second matching layer; 22-a second working layer; 23-a second backing layer; 31-a third matching layer; 32-a third working layer; 33-a third backing layer.
Detailed Description
The present invention is described in further detail below with reference to examples to enable those skilled in the art to practice the same by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
As shown in fig. 1, a non-focusing sound field enhancement transducer of the present embodiment includes 3 transducers arranged in a star shape (as viewed from the top on the left side of fig. 1): a first transducer 1, a second transducer 2 and a 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 2 comprises a second working layer 22, a second matching layer 21 arranged on the front side of the second working layer 22 and a second backing layer 23 arranged on the back side of the second working layer 22; the third transducer 3 comprises a third working layer 32, a third matching layer 31 arranged on the front side of the third working layer 32 and a third backing layer 33 arranged on the back side of the third working layer 32.
Wherein the materials of the first, second and third working layers (12, 22, 32) can be piezoelectric ceramics, piezoelectric composite materials, piezoelectric single crystals or film materials. The first, second and third working layers (12, 22, 32) may each be a single-layer working layer structure or a multi-layer working layer structure.
The first, second and third matching layers (11, 21, 31) can be single-layer matching structures or multi-layer matching structures.
Wherein each of the first, second and third backing layers (13, 23, 33) may be wavy or slanted.
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, the included angle between the first transducer 1 and the third transducer 3 is θ3, each of θ1, θ2 and θ3 is 15 ° -165 °, and θ1+θ2+θ3=360°.
The center frequencies of the first transducer 1, the second transducer 2 and the third transducer 3 are f1, f2 and f3 respectively, and the frequencies of f1, f2 and f3 are all 1-30 MHz.
In this embodiment, the first transducer 1, the second transducer 2 and the third transducer 3 are all unidirectional emitting sound field signals with weak scattering back, the spatial sound field is enhanced at the intersection of the radiation directions of the first transducer 1 and the second transducer 2, and the intersection of the second transducer 2 back and the forward radiation direction of the third transducer 3 is enhanced. By changing the transducer spatial angle, 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; referring to fig. 2, a simulation result diagram of the spatial absolute sound pressure distribution in the present embodiment is shown.
It is to be understood that therein
Example 2
This embodiment is largely identical to embodiment 1, and only the differences are described below.
Referring to fig. 3, in this embodiment, the difference from embodiment 1 is mainly that: none of the first transducer 1, the second transducer 2 and the third transducer 3 comprises a backing layer. In this embodiment, the first transducer 1, the second transducer 2 and the third transducer 3 are all emitting unidirectionally, and scatter sound field signals are emitted in the back direction, so that the spatial sound field is enhanced at the intersection of the radiation directions of the first transducer 1 and the second transducer 2, and the intersection of the back direction of the second transducer 2 and the forward radiation direction of the third transducer 3. 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; referring to fig. 4, a simulation result diagram of the spatial absolute sound pressure distribution in the present embodiment is shown.
Example 3
This embodiment is largely identical to embodiment 1, and only the differences are described below.
Referring to fig. 5, in this embodiment, the difference from embodiment 1 is mainly that: none of the first transducer 1, the second transducer 2 and the third transducer 3 comprises a backing layer and a matching layer, i.e. each has only an active layer. In this embodiment, the first transducer 1, the second transducer 2 and the third transducer 3 are all bidirectional transmitting sound field signals, the spatial sound field is enhanced at the intersection of the radiation directions between the three transducers, and the embodiment can play a role in enhancing the sound field at three places at the same time, and can obtain three spatially distributed enhanced sound fields with the included angles of the radiation directions being theta. 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; referring to fig. 6, a simulation result diagram of the spatial absolute sound pressure distribution in the present embodiment is shown.
Example 4
This embodiment is largely identical to embodiment 3, and only the differences are described below.
Referring to fig. 7, in the present embodiment, the difference from embodiment 1 is mainly that: the center frequencies of the first, second and third transducers 3 are f1, f2, f3, respectively, and f1, f2, f3 are not identical at the same time. In this embodiment, the first transducer 1, the second transducer 2 and the third transducer 3 are two-way emission sound field signals, the spatial sound field is enhanced at the intersection of the radiation directions of the first transducer 1, the second transducer 2 and the third transducer 3, the embodiment can play a role in enhancing the mixing sound field at three places simultaneously, three spatially distributed enhancing mixing sound fields with the included angle theta of the radiation directions can be obtained, the method can be applied to mixing interventional ablation treatment with different depths, the low frequency can obtain higher penetration depth, the effect on deep tissues can be achieved, and the high-low frequency superposition area can obtain better treatment effect. In a further preferred embodiment, θ=120°; referring to fig. 8, a simulation result diagram of the spatial absolute sound pressure distribution in the present embodiment is shown.
Example 5
In this embodiment, 1 of the 3 transducers further has an imaging function, referring to fig. 9, the first transducer 1 and the second transducer 2 obtain a superimposed enhanced sound field at the intersection of the lower radiation directions, and the third transducer 3 has an imaging function, and when in use, the enhanced sound field obtained by the first transducer 1 and the second transducer 2 is used for treatment, and then the treatment site is imaged by rotating 180 ° by using the third transducer 3 in combination with necessary external ultrasound imaging equipment, so that the treatment effect of the treatment site can be observed in real time.
Although embodiments of the present invention have been disclosed above, it is not limited to the use of the description and embodiments, it is well suited to various fields of use for the invention, and further modifications may be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the particular details without departing from the general concepts defined in the claims and the equivalents thereof.
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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110711455.4A CN113414089B (en) | 2021-06-25 | 2021-06-25 | Non-focusing sound field enhanced transducer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110711455.4A CN113414089B (en) | 2021-06-25 | 2021-06-25 | Non-focusing sound field enhanced transducer |
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| CN113414089A CN113414089A (en) | 2021-09-21 |
| CN113414089B true CN113414089B (en) | 2023-07-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI418782B (en) * | 2010-12-14 | 2013-12-11 | Ind Tech Res Inst | Ultrasonic transducer detector |
| WO2017144288A1 (en) * | 2016-02-23 | 2017-08-31 | Koninklijke Philips N.V. | Ultrasound ablation device |
| CN105944947B (en) * | 2016-06-29 | 2018-07-03 | 北京工业大学 | A kind of non-through type gas baseline focus Air Coupling sensor of coaxial double cambered surfaces |
| WO2018007868A1 (en) * | 2016-07-08 | 2018-01-11 | Insightec, Ltd. | Systems and methods for ensuring coherence between multiple ultrasound transducer arrays |
| CN107755230A (en) * | 2017-11-16 | 2018-03-06 | 中国计量大学 | The controllable high power altrasonic transducer of sound field |
| CN109925615B (en) * | 2017-12-18 | 2021-11-19 | 深圳先进技术研究院 | Magnetic compatible brain ultrasonic stimulation device and manufacturing method thereof |
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