CN111013996A - Ultrasonic transducer - Google Patents
Ultrasonic transducer Download PDFInfo
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- CN111013996A CN111013996A CN201911397164.1A CN201911397164A CN111013996A CN 111013996 A CN111013996 A CN 111013996A CN 201911397164 A CN201911397164 A CN 201911397164A CN 111013996 A CN111013996 A CN 111013996A
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- piezoelectric element
- ultrasonic transducer
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- electrode part
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- 230000006835 compression Effects 0.000 claims abstract description 5
- 238000007906 compression Methods 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 9
- 230000026683 transduction Effects 0.000 abstract description 3
- 238000010361 transduction Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000009210 therapy by ultrasound Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 238000002560 therapeutic procedure 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
-
- 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
- B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
- B06B2201/70—Specific application
- B06B2201/76—Medical, dental
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention discloses an ultrasonic transducer, comprising: a first electrode part and a second electrode part; an insulating member to isolate the first electrode part and the second electrode part; a piezoelectric element against which the second electrode member abuts; a case capable of effecting compression on the piezoelectric element and electrically communicating with the first electrode part and the piezoelectric element, respectively. According to the invention, the second electrode part is abutted against the piezoelectric element, and the shell conducts the first electrode and the piezoelectric element electrically, so that the conduction by using a welding wire is avoided, the piezoelectric element is pressed by matching the second electrode part with the shell, an electric signal can be converted into mechanical vibration based on a piezoelectric effect under the condition of electrification, and then ultrasonic transduction is realized.
Description
Technical Field
The invention relates to the technical field of transducers, in particular to an ultrasonic transducer.
Background
The ultrasonic therapy technique is a noninvasive surgical technique which is developed vigorously in recent years, and has been widely applied and popularized in clinical medicine because it is noninvasive, harmless, safe and effective in the treatment process and can ensure the safety and integrity of tissues. The ultrasonic transducer is a core part of ultrasonic treatment and widely applied to treatment systems of gynecological inflammation and the like, the ultrasonic transducer is usually made of piezoelectric ceramics, an electric signal is converted into mechanical vibration by utilizing the piezoelectric effect of the piezoelectric ceramics, the ultrasonic transducer in the prior art usually connects an electrode with the piezoelectric ceramics in a wire bonding mode, and welding spots in the wire bonding mode can influence the performance of the transducer and can not work normally due to falling off easily, so that the sound wave output of the ultrasonic transducer is unstable.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an ultrasonic transducer which can solve the problem of unstable sound wave output.
In a first aspect, an embodiment of the present invention provides an ultrasonic transducer, including:
a first electrode part and a second electrode part;
an insulating member to isolate the first electrode part and the second electrode part;
a piezoelectric element against which the second electrode member abuts;
a case capable of effecting compression on the piezoelectric element and electrically communicating with the first electrode part and the piezoelectric element, respectively.
The ultrasonic transducer of the embodiment of the invention at least has the following beneficial effects:
according to the embodiment of the invention, the second electrode part is abutted against the piezoelectric element, and the shell is used for electrically conducting the first electrode and the piezoelectric element, so that the conduction by using a welding wire is avoided, the piezoelectric element is pressed by matching the second electrode part with the shell, an electric signal can be converted into mechanical vibration based on a piezoelectric effect under the condition of being electrified, and then ultrasonic transduction is realized, the problem of unstable sound wave output caused by the fact that the welding wire is easy to fall off is solved because the welding wire is not used, and the ultrasonic treatment device has a better application prospect in the technical field of ultrasonic treatment.
According to still further embodiments of the ultrasonic transducer according to the present invention, the second electrode part, the piezoelectric element and the housing are coaxial. The piezoelectric element is usually a piezoelectric ceramic wafer, the material is fragile, the second electrode part supports against the piezoelectric element to apply pressure to the piezoelectric element, the shell compresses the piezoelectric element, and when the second electrode part, the piezoelectric element and the shell are coaxial, the pressure of the second electrode part to the piezoelectric element and the pressure of the shell to the piezoelectric element are on the same axis, so that the piezoelectric element is not easy to break.
According to the ultrasonic transducer of other embodiments of the present invention, the insulating member is sleeved on the inner side of the first electrode part, and the second electrode part is sleeved on the inner side of the insulating member. The two electrode components of the ultrasonic transducer are made into a sleeved structure, the ultrasonic transducer can be connected with a power supply by arranging the conductive connecting rods matched with the shapes of the end parts of the two electrode components, a new installation form is provided, meanwhile, the influence of welding points in a welding wire form on the performance of the ultrasonic transducer is avoided, and the feasibility and the sound wave output stability of the ultrasonic transducer are improved.
According to still further embodiments of the ultrasonic transducer according to the present invention, the second electrode member has a hollow cavity, and one end of the cavity communicates with the piezoelectric element. Because piezoelectric element work generates heat easily, the during operation can let in the circulating water in the cavity that sets up, and then realize the cooling to piezoelectric element, owing to need not to put through piezoelectric element through the bonding wire simultaneously, avoided among the traditional ultrasonic transducer bonding wire easily by circulating water impact and lead to the solder joint to drop and then the problem of unable normal work.
According to the ultrasonic transducer of the other embodiments of the present invention, there is further provided a telescopic member capable of applying pressure to the piezoelectric element by abutting against the second electrode member. Due to the fact that the telescopic component is arranged, when the shell is assembled, the telescopic component can be further compressed through the piezoelectric element and the second electrode component, the telescopic component can be enabled to abut against the second electrode component to apply pressure to the piezoelectric element, the assembly is convenient, the pressure applied to the piezoelectric element by the shell can be flexibly adjusted by adjusting the compression degree of the telescopic component, the piezoelectric effect of the piezoelectric element is further adjusted, and therefore the sound wave intensity output by the ultrasonic transducer is controlled.
According to still further another embodiment of the ultrasonic transducer, a side of the insulating member adjacent to the second electrode member is provided with a first step, a side of the second electrode member adjacent to the insulating member is provided with a second step, and the telescopic member is disposed between the first step and the second step. The telescopic member can be fixed by the insulating member and the step provided by the second electrode member.
According to still other embodiments of the ultrasonic transducer according to the present invention, the piezoelectric element is a curved surface type, and the second electrode part has a curved surface end surface which is fitted to the curved surface of the piezoelectric element. The piezoelectric element is made into a curved surface type, and can play a self-focusing role, so that the ultrasonic transducer has the advantages of small volume, strong sound, concentrated energy, small loss and the like.
According to further embodiments of the ultrasonic transducer according to the present invention, a conductive gasket is further provided between the housing and the piezoelectric element. The conductive gasket is arranged in the shell and the piezoelectric element, so that the extrusion force of the shell to the piezoelectric element can be reduced on the premise of ensuring an electric path, and the piezoelectric element is protected from being easily damaged.
According to the ultrasonic transducer of other embodiments of the present invention, the first electrode part is provided with a positioning boss, and the positioning boss is used for positioning the housing. The location boss regulates and controls the extrusion degree of the shell pressing the piezoelectric element by limiting the position of the shell, and then controls the intensity of the output sound wave of the ultrasonic transducer.
According to further embodiments of the ultrasonic transducer according to the present invention, the housing is screwed to the first electrode part. In some embodiments, the housing may be rotationally fixed and the piezoelectric element may be compressed by providing threads on the first electrode part and the housing, screwing the threads together.
According to the ultrasonic transducer of the other embodiments of the present invention, a side of the first electrode part adjacent to the insulating part is provided with a third step, and the insulating part is provided with a fourth step which is engaged with the third step. The first electrode part and the insulating part are provided with the steps, so that the first electrode part and the insulating part are matched more firmly and are not easy to slip.
Drawings
Fig. 1 is a sectional view of an ultrasonic transducer in a first embodiment;
FIG. 2 is an enlarged, partially exploded schematic view of the ultrasonic transducer of FIG. 1;
FIG. 3 is an enlarged view of a portion of the ultrasonic transducer of FIG. 1;
fig. 4 is an exploded view of an ultrasonic transducer in a second embodiment;
fig. 5 is a schematic structural view of an assembled ultrasonic transducer in the second embodiment.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
In the description of the embodiments of the present invention, if an orientation description is referred to, for example, the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, if a feature is referred to as being "disposed", "fixed", "connected", or "mounted" to another feature, it may be directly disposed, fixed, or connected to the other feature or may be indirectly disposed, fixed, connected, or mounted to the other feature. In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
Referring to fig. 1, a cross-sectional view of an ultrasonic transducer in a first embodiment is shown. In the present embodiment, the ultrasonic transducer 100 includes a first electrode member 110 and a second electrode member 120, the first electrode member 110 is separated from the second electrode member 120 by an insulating member 130, the second electrode member 120 supports against a piezoelectric element 140 from bottom to top, in the present embodiment, the piezoelectric element 140 is a piezoelectric ceramic wafer, and a casing 150 presses the piezoelectric element 140 from top to bottom through a conductive gasket 160, so as to press the piezoelectric element to generate pressure, in the present embodiment, the casing 150 is a conductive casing, one end of the casing 150 is in direct contact with the first electrode member 110 and is electrically conducted, and the other end is electrically conducted through the conductive gasket 160 and the piezoelectric element 140, in the present embodiment, the first electrode member 110 is a positive electrode end of the ultrasonic transducer, the second electrode member 120 is a negative electrode end of the ultrasonic transducer, when the first electrode member 110 and the second electrode member 120 are respectively conducted with a positive electrode and a negative electrode of a power, due to the pressing action of the second electrode part 120 and the housing 150 on the piezoelectric element 140, the piezoelectric element 140 converts an electric signal into mechanical vibration based on the piezoelectric effect to thereby perform ultrasonic transduction. In this embodiment, the housing 150 is electrically connected to the piezoelectric element 140 through the conductive gasket 160, so as to reduce the pressure of the housing 150 on the piezoelectric element 140, thereby protecting the piezoelectric element 140 from being damaged, and on the premise of achieving the purpose of electrically connecting the housing 150 to the piezoelectric element 140, the housing and the piezoelectric element may be directly contacted and pressed without using the conductive gasket, and at this time, in order to reduce the damage to the piezoelectric element caused by the pressing of the housing, a portion of the housing, which is in contact with the piezoelectric element, may be set to be an elastic material.
According to some embodiments of the present invention, the second electrode part 120, the piezoelectric element 140 and the housing 150 may be arranged in a coaxial line, and at this time, the pressure generated by the second electrode part 120 abutting against the piezoelectric element 140 and the pressure generated by the housing 150 pressing against the piezoelectric element 140 are on the same axis, so that the pressures applied to the upper surface and the lower surface of the piezoelectric element 140 are balanced, and the piezoelectric element 140 is not easily broken.
According to some embodiments of the present invention, the insulating member 130 is sleeved on the inner side of the first electrode member 110, and the second electrode member 120 is sleeved on the inner side of the insulating member 130, so that the lower end of the formed ultrasonic transducer is exposed out of the end portions of the first electrode member 110 and the second electrode member 120, and the ultrasonic transducer and the power supply can be electrically connected by arranging a connecting rod and other structures matched with the shapes of the end portions of the two electrodes, at this time, a conduction mode in a form of a bonding wire can be avoided, thereby avoiding the influence of a welding point of the bonding wire on the performance of the ultrasonic transducer, and improving the stability of the acoustic wave output of the transducer.
According to some embodiments of the present invention, since the piezoelectric element 140 is easy to generate heat during operation, the hollow cavity 170 may be disposed in the second electrode component 120, and circulating water is introduced into the cavity 170 in an operating state, so as to cool the piezoelectric element 140, and meanwhile, since no bonding wire is connected to the piezoelectric element 140, the problem that the welding point of the bonding wire is easy to be impacted and fall off by the circulating water in the conventional ultrasonic transducer is avoided.
According to some embodiments of the present invention, the ultrasonic transducer 100 is further provided with a telescopic member 180, the telescopic member 180 may be a stainless steel spring, when the housing 150 compresses the piezoelectric element 140, the telescopic member 180 can be compressed by the second electrode part 120, the telescopic member 180 abuts against the second electrode part 120 by a reaction force, so as to apply a pressure to the piezoelectric element 140, the magnitude of the pressure on the piezoelectric element 140 can be flexibly adjusted by using the compression degree of the telescopic member 180, so as to adjust the piezoelectric effect of the piezoelectric element 140, and thus, the purpose of flexibly adjusting the intensity of the sound wave output by the ultrasonic transducer is achieved.
Referring to fig. 2, fig. 2 is a partially enlarged and exploded schematic view of the ultrasound transducer in fig. 1, a first step 131 is disposed on a side of the insulating member 130 close to the second electrode member 120, a second step 121 is disposed on a side of the second electrode member close to the insulating member, and the telescopic member 180 is disposed between the first step 131 and the second step 121, such that the first step 131 and the second step 121 can be used to fix the telescopic member 180.
According to some embodiments of the present invention, the first electrode part 110 is provided with a third step 111 on a side close to the insulating part 130, the insulating part 130 is provided with a fourth step 132 matching with the third step 111, and after assembly, the third step 111 and the fourth step 132 are mutually matched and fixed and are not easy to slip.
According to some embodiments of the present invention, the first electrode part 110 is provided with a positioning boss 112 for defining the position of the housing 150, and since the housing 150 has a pressing effect on the piezoelectric element, the degree of pressing the piezoelectric element by the housing 150 can be adjusted by defining the position of the housing 150, so as to adjust the intensity of the output sound wave of the ultrasonic transducer.
According to the ultrasonic transducer according to other embodiments of the present invention, the housing 150 and the first electrode part 110 are screwed by providing the screw threads to be matched with each other, so that the housing is rotationally fixed and the piezoelectric element is compressed by the screw threads.
Referring to fig. 3, fig. 3 is a partial enlarged view of the ultrasound transducer in fig. 1, the piezoelectric element 140 is a curved surface and can perform a self-focusing function, the second electrode part 120 has a curved surface end surface 122 matching with the curved surface of the piezoelectric element 140, and after assembly, the curved surface end surface 122 is attached to the piezoelectric element 140 and is used for supporting the piezoelectric element 140.
Referring to fig. 4, an exploded view of the ultrasonic transducer in the second embodiment is shown. The ultrasonic transducer 100 includes a first electrode part 110, an insulating part 130, a telescopic part 180, a second electrode part 120, a piezoelectric element 140, a conductive gasket 160, and a housing 150. During assembly, the insulating part 130 is sleeved on the inner side of the first electrode part 110, the second electrode part 120 is sleeved on the inner side of the insulating part 130, the insulating part 130 is used for isolating the polarity of the first electrode part 110 and the polarity of the second electrode part 120 to distinguish the positive electrode from the negative electrode, the telescopic part 130 is fixed through the first step on the insulating part 130 and the second step on the second electrode part 120, the piezoelectric element 140 and the conductive gasket 160 are sequentially placed above the second electrode part 120, and finally, the shell 160 is used for compressing and fixing, and the combined ultrasonic transducer is as shown in fig. 5. When the power supply is required to be connected and electrified, the ultrasonic transducer and the power supply can be connected through the conductive connecting rod matched with the end shapes of the two electrode parts, a new installation form is provided, meanwhile, the influence of welding points in a welding wire form on the performance of the ultrasonic transducer is avoided, and the feasibility and the sound wave output stability of the transducer are improved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. An ultrasonic transducer, comprising:
a first electrode part and a second electrode part;
an insulating member to isolate the first electrode part and the second electrode part;
a piezoelectric element against which the second electrode member abuts;
a case capable of effecting compression on the piezoelectric element and electrically communicating with the first electrode part and the piezoelectric element, respectively.
2. The ultrasonic transducer according to claim 1, wherein said second electrode part, said piezoelectric element and said housing are coaxial.
3. The ultrasonic transducer according to claim 1, wherein said insulating member is sleeved inside said first electrode member, and said second electrode member is sleeved inside said insulating member.
4. The ultrasonic transducer according to claim 3, wherein said second electrode member has a hollow cavity, one end of said cavity communicating with said piezoelectric element.
5. The ultrasonic transducer according to any one of claims 1 to 4, wherein a telescopic member is further provided, said telescopic member being capable of applying a pressure to said piezoelectric element by abutting against said second electrode member.
6. The ultrasonic transducer according to claim 5, wherein a side of said insulating member adjacent to said second electrode member is provided with a first step, a side of said second electrode member adjacent to said insulating member is provided with a second step, and said expansion member is disposed between said first step and said second step.
7. The ultrasonic transducer according to any one of claims 1 to 4, wherein said piezoelectric element is of a curved surface type, and said second electrode member has a curved end surface which is fitted to the curved surface of said piezoelectric element.
8. The ultrasonic transducer according to any one of claims 1 to 4 wherein a conductive gasket is further disposed between said housing and said piezoelectric element.
9. The ultrasonic transducer according to any one of claims 1 to 4 wherein said first electrode part is provided with positioning bosses for positioning said housing.
10. The ultrasonic transducer according to any one of claims 1 to 4, wherein a side of said first electrode member adjacent to said insulating member is provided with a third step, and said insulating member is provided with a fourth step which is engaged with said third step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397164.1A CN111013996A (en) | 2019-12-30 | 2019-12-30 | Ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397164.1A CN111013996A (en) | 2019-12-30 | 2019-12-30 | Ultrasonic transducer |
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| Publication Number | Publication Date |
|---|---|
| CN111013996A true CN111013996A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911397164.1A Pending CN111013996A (en) | 2019-12-30 | 2019-12-30 | Ultrasonic transducer |
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| CN (1) | CN111013996A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111632284A (en) * | 2020-04-27 | 2020-09-08 | 深圳市普罗医学股份有限公司 | Ultrasonic treatment head for chest and lung treatment and ultrasonic treatment equipment |
| CN114632363A (en) * | 2022-03-11 | 2022-06-17 | 武汉轻工大学 | Residue discharging device for separating egg liquid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090015104A1 (en) * | 2007-03-29 | 2009-01-15 | Ngk Spark Plug Co., Ltd. | Ultrasonic transducer and ultrasonic apparatus having the same |
| CN104001277A (en) * | 2014-06-13 | 2014-08-27 | 大连交通大学 | Complex frequency ultrasonic tumor treatment head |
| US20180014846A1 (en) * | 2016-07-12 | 2018-01-18 | Ethicon Llc | Ultrasonic surgical instrument with piezoelectric central lumen transducer |
| CN211937730U (en) * | 2019-12-30 | 2020-11-17 | 深圳市普罗医学股份有限公司 | Ultrasonic transducer |
-
2019
- 2019-12-30 CN CN201911397164.1A patent/CN111013996A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090015104A1 (en) * | 2007-03-29 | 2009-01-15 | Ngk Spark Plug Co., Ltd. | Ultrasonic transducer and ultrasonic apparatus having the same |
| CN104001277A (en) * | 2014-06-13 | 2014-08-27 | 大连交通大学 | Complex frequency ultrasonic tumor treatment head |
| US20180014846A1 (en) * | 2016-07-12 | 2018-01-18 | Ethicon Llc | Ultrasonic surgical instrument with piezoelectric central lumen transducer |
| CN211937730U (en) * | 2019-12-30 | 2020-11-17 | 深圳市普罗医学股份有限公司 | Ultrasonic transducer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111632284A (en) * | 2020-04-27 | 2020-09-08 | 深圳市普罗医学股份有限公司 | Ultrasonic treatment head for chest and lung treatment and ultrasonic treatment equipment |
| CN111632284B (en) * | 2020-04-27 | 2021-04-20 | 深圳市普罗医学股份有限公司 | Ultrasonic treatment head for chest and lung treatment and ultrasonic treatment equipment |
| CN114632363A (en) * | 2022-03-11 | 2022-06-17 | 武汉轻工大学 | Residue discharging device for separating egg liquid |
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