CN116764924A - Large-amplitude ultrasonic transducer and ultrasonic surgical knife - Google Patents
Large-amplitude ultrasonic transducer and ultrasonic surgical knife Download PDFInfo
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- CN116764924A CN116764924A CN202310928389.5A CN202310928389A CN116764924A CN 116764924 A CN116764924 A CN 116764924A CN 202310928389 A CN202310928389 A CN 202310928389A CN 116764924 A CN116764924 A CN 116764924A
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- transducer
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- 239000000919 ceramic Substances 0.000 claims abstract description 53
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 37
- 238000002604 ultrasonography Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 9
- 230000010287 polarization Effects 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 230000003321 amplification Effects 0.000 abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
-
- 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
- B06B2201/50—Application to a particular transducer type
- B06B2201/55—Piezoelectric transducer
-
- 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
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Surgery (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Biomedical Technology (AREA)
- Dentistry (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention discloses a large-amplitude ultrasonic transducer and an ultrasonic surgical knife, wherein the ultrasonic transducer comprises an amplitude transformer, piezoelectric ceramics and a rear cover which are sequentially connected together, the piezoelectric ceramics comprises at least two ceramic plates, the amplitude transformer sequentially comprises a rear end, a reinforcing section and a front end from the direction close to the piezoelectric ceramics to the direction far away from the piezoelectric ceramics, the surface of the reinforcing section is provided with a plurality of grooves which are concave inwards and extend along the axial direction of the reinforcing section, the total length of the front end and the reinforcing section is smaller than one quarter wavelength, the length of the reinforcing section is smaller than one half of the total length of the amplitude transformer, and the axial vibration generated by the operation of the at least two ceramic plates sequentially passes through the rear end, the reinforcing section and the front end, and the rear amplitude of the front end can be amplified twice. The amplitude transformer with a three-section structure is adopted to realize secondary amplification of the amplitude, and the effect consistent with the amplitude of the transducer of the traditional four ceramic plates is realized under the same current on the premise of reducing the number of the ceramic plates. Solves the problems of high cost and environmental pollution caused by a large number of ceramic plates.
Description
Technical Field
The invention belongs to the technical field of ultrasonic transducers, and particularly relates to a large-amplitude ultrasonic transducer and an ultrasonic surgical knife.
Background
Currently, ultrasonic scalpels are widely used in various surgical operations. Compared with the traditional surgical equipment, the ultrasonic surgical knife has the advantages of high precision, small wound, easy recovery after operation and the like. The operating principle of the ultrasonic surgical knife is that the piezoelectric ultrasonic transducer is driven by simple harmonic alternating current to generate vibration, so that the cutting and coagulation of tissues are realized.
In order to increase the cutting speed of an ultrasonic surgical blade, it is often required that the ultrasonic transducer have a large amplitude ratio so that the ultrasonic blade head generates a larger amplitude under the same current excitation.
To achieve this objective, the existing ultrasonic transducers often comprise at least 4 pieces of ceramic, which results in higher cost of the transducer and more easily causes environmental pollution after scrapping due to the fact that the ceramic pieces contain a large amount of lead; while the narrow end diameter of conventional transducers is smaller, resulting in unreliable structures. Accordingly, it is necessary to provide a new ultrasonic transducer to solve the above-described problems.
Disclosure of Invention
In view of at least one of the above-mentioned problems, an object of the present invention is to provide a large-amplitude ultrasonic transducer and an ultrasonic scalpel, which adopt two pieces of ceramics to achieve the purposes of cost reduction and environmental protection, and simultaneously, through the enhancement of the structure to the amplitude of the transducer, the transducer can generate the same amplitude as that of the conventional four-piece ceramic (or more than four-piece ceramic) transducer under the same current.
The technical scheme of the invention is as follows:
the invention aims to provide a large-amplitude ultrasonic transducer which comprises an amplitude transformer, piezoelectric ceramics and a rear cover which are sequentially connected together, wherein the piezoelectric ceramics comprise at least two ceramic plates, the amplitude transformer sequentially comprises a rear end, a reinforcing section and a front end from the direction close to the piezoelectric ceramics to the direction far away from the piezoelectric ceramics, the surface of the reinforcing section is provided with a plurality of grooves which are concave inwards and extend along the axial direction of the reinforcing section, the total length of the front end and the reinforcing section is smaller than one quarter wavelength, the length of the reinforcing section is smaller than one half of the total length of the amplitude transformer, and axial vibration generated by the operation of at least two ceramic plates sequentially passes through the rear end, the reinforcing section and the front end, and then the amplitude can be amplified twice.
Another object of the present invention is to provide an ultrasonic surgical blade comprising the ultrasonic transducer as described above
Compared with the prior art, the invention has the advantages that:
according to the large-amplitude ultrasonic transducer, the amplitude transformer structure is designed, and the three-section structure is adopted, so that the secondary amplification of the amplitude can be realized, and the effect consistent with the amplitude of the transducer of the traditional four ceramic plates can be realized under the same current excitation on the premise of reducing the number of the ceramic plates. Solves the problems of high cost and environmental pollution caused by a large number of ceramic plates of the transducer in the prior art.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a schematic diagram of one of the structures of a large amplitude ultrasound transducer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another embodiment of a large amplitude ultrasound transducer;
FIG. 3 is a cut-away view of an enhanced section of the ultrasound transducer of FIG. 2;
FIG. 4 is a schematic diagram of yet another embodiment of a large amplitude ultrasound transducer according to the present invention;
FIG. 5 is a cut-away view of an enhanced section of the large amplitude ultrasound transducer of FIG. 4;
FIG. 6 is a schematic diagram of yet another embodiment of a large amplitude ultrasound transducer according to the present invention;
fig. 7 is a cut-away view of an enhanced section of the large amplitude ultrasound transducer of fig. 6.
Wherein: 1. a front end; 2. a reinforcing section; 21. a groove; 3. a rear end; 4. piezoelectric ceramics; 5. and a rear cover.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
Referring to fig. 1 to 7, a large-amplitude ultrasonic transducer according to an embodiment of the present invention includes a horn, a piezoelectric ceramic 4, and a rear cover 5 which are sequentially connected together. The piezoelectric ceramic 4 includes at least two ceramic pieces. In order to reduce cost and protect environment, two ceramic plates are preferred in the embodiment of the invention. But if a larger amplitude ratio is desired, the number of ceramic plates may be increased, i.e. the number of ceramic plates may also be more than 2, such as four or more than four as is conventional in the prior art, etc. That is, two or four equal numbers of ceramic sheets are within the scope of embodiments of the present invention. The horn, the ceramic and the rear cover 5 are tightly connected, and a certain prestress is applied to the ceramic plate. The specific connection mode is the prior art, and is not described in detail, and is easily known and realized by those skilled in the art. As for the horn, which is an innovation point of the present invention, specifically, as shown in fig. 1, the horn sequentially comprises a rear end 3, a reinforcing section 2 and a front end 1 from the direction close to the piezoelectric ceramic 4 to the direction far away from the piezoelectric ceramic 4, i.e. from left to right as shown in fig. 1. The outer surface of the reinforcing section 2 is provided with a plurality of grooves 21 which are concave inwards and extend along the axial direction of the reinforcing section 2, the total length of the front end 1 and the reinforcing section 2 is smaller than one quarter wavelength, and the length of the reinforcing section 2 is smaller than one half of the total length of the amplitude transformer, so that the purpose of the design is to prevent the reinforcing section 2 from generating an amplitude amplification effect and simultaneously prevent the transducer from generating serious torsional vibration. The axial vibration generated by the operation of at least two ceramic plates sequentially passes through the rear end 3, the reinforcing section 2 and the front end 1, and the amplitude can be amplified twice. That is, when the axial vibration of the ceramic plate propagates to the enhancement section 2 through the rear end 3, the axial vibration is amplified through the enhancement section 2 to realize primary amplitude amplification, and then propagates to the front end 1 through the enhancement section 2 to generate a further amplification effect, namely, realize secondary amplitude amplification.
According to some preferred embodiments of the invention, the depth of the groove 21 should be less than one quarter of the diameter of the reinforcement section 2, as shown in fig. 3, 5 and 7. The purpose of this design is to avoid causing stress concentrations.
According to some preferred embodiments of the present invention, as shown in fig. 3, 5 and 7, the number of grooves 21 is at least four, and at least four grooves 21 are uniformly spaced along the circumferential direction of the reinforcing section 2. The aim of such a design is to achieve a better amplitude enhancement.
According to some preferred embodiments of the present invention, the cross-sectional shape of the recess 21 is square or semicircular as shown in fig. 3, 5 and 7.
According to some preferred embodiments of the present invention, as shown in fig. 1, 2 and 4, the grooves 21 are spiral grooves, the angle of which, i.e. the angle of the spiral direction of the spiral groove to the axis, is less than 30 °. The aim of such a design is to be able to further effectively avoid the torsional vibrations of the transducer. As an alternative embodiment, as shown in fig. 6, the groove 21 is a straight groove extending in the axial direction of the reinforcement section 2.
According to some preferred embodiments of the present invention, as shown in fig. 1 to 7, the reinforcing section 2 and the front end 1 are cylindrical bodies having uniform diameters throughout the axial direction and the diameter of the front end 1 is greater than or equal to the diameter of the reinforcing section 2. The purpose of this design is to even further cancel the torsional vibration of the transducer.
According to some preferred embodiments of the invention, as shown in fig. 1 to 7, the rear end 3 comprises a cylindrical section distant from one end of the reinforcing section 2 and a tapered transition section near one end of the reinforcing section 2, the diameter of the cylindrical section being greater than or equal to the diameter of the piezoelectric ceramic 4. The aim of such a design is to reduce the sensitivity of the transducer to load.
According to some preferred embodiments of the present invention, as shown in fig. 1 to 7, the diameter of the rear cover 5 is not smaller than, i.e., greater than or equal to, the diameter of the piezoelectric ceramic 4. The aim of such a design is to reduce the sensitivity of the transducer to load.
According to some preferred embodiments of the present invention, as shown in fig. 1 to 7, the number of ceramic sheets is two, and the polarization directions of the two ceramic sheets are opposite. By the design, the ceramic plates are connected in series on the mechanical connection, and when the ceramic plates vibrate, the amplitudes are overlapped and cannot offset each other. Alternatively, the material of the ceramic sheet is PZT8 or PZT4, which is conventional in the existing market.
According to some preferred embodiments of the invention, the material density of the front end 1, the reinforcing section 2 and the rear end 3, i.e. the material density of the horn, is less than the material density of the rear cover 5. The purpose of this design is to maximize the amplitude and amplification of the transducer. The particular materials are not described or limited and are readily known and practiced by those skilled in the art for the conventional horn materials such as titanium alloys and the like and the rear cover 5 materials such as steel and the like.
Example 1
Referring to fig. 2 and 3, the ultrasonic transducer of the embodiment of the present invention has the same diameters of the rear end 3 and the rear cover 5 as well as the ceramic plate. The diameter of the front end 1 is larger than the diameter of the reinforcement section 2. The grooves 21 on the reinforcing section 2 are spiral grooves and the cross section of the grooves 21 is circular, the diameter is 2mm, and the angle of the grooves 21 is 30 °. The resonant frequency of the transducer was 55kHz. Through testing, under the excitation of 340mA current, the impedance of the transducer is 20Ω during resonance, the amplitude of the front end 1 head of the amplitude transformer is 21um, and the amplitude is consistent with the amplitude (15-25 um) of the transducer of the traditional four ceramic plates.
Example 2
Referring to fig. 4 and 5, in the ultrasonic transducer of the embodiment of the present invention, the diameter of the front end 1 is larger than the diameter of the enhancement section 2, the groove 21 on the enhancement section 2 is a spiral groove, the cross section of the groove 21 is rectangular, the width of the groove 21 is 2mm, the depth of the groove 21 is 1mm, the angle of the groove 21 is 20 °, and the resonant frequency of the transducer is 55kHz. Through testing, under the excitation of 340mA current, the impedance of the transducer is 18 omega during resonance, the amplitude of the front end 1 head of the amplitude transformer is 20um, and the amplitude is consistent with the amplitude (15-25 um) of the transducer of the traditional four ceramic plates.
Example 3
Referring to fig. 6 and 7, in the ultrasonic transducer of the embodiment of the present invention, the diameters of the rear end 3 and the rear cover 5 are larger than the diameter of the ceramic plate, the diameter of the front end 1 is equal to the diameter of the reinforcing section 2, the groove 21 on the reinforcing section 2 is a straight groove, the cross section of the groove 21 is rectangular, the width of the groove 21 is 2mm, the depth of the groove 21 is 1mm, the angle of the groove 21 is 0 °, and the resonant frequency of the transducer is 55kHz. Through testing, under the excitation of 340mA current, the impedance of the transducer is 15 omega during resonance, the amplitude of the front end 1 head of the amplitude transformer is 17um, and the amplitude is consistent with the amplitude (15-25 um) of the transducer of the traditional four ceramic plates.
Example 4
The embodiment of the invention also provides an ultrasonic surgical knife comprising the ultrasonic transducer of the embodiment. The ultrasonic transducer of the above embodiment is included, so that the beneficial effects of the ultrasonic transducer of the above embodiment are at least provided, and detailed descriptions are omitted.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (10)
1. The utility model provides a large-amplitude ultrasonic transducer, includes amplitude transformer, piezoceramics and the back lid that links gradually together, its characterized in that, piezoceramics includes two at least potsherds, the amplitude transformer is by being close to piezoceramics to keeping away from in the direction of piezoceramics includes rear end, enhancement section and front end in proper order, the surface of enhancement section is opened has a plurality of inwards sunken and is followed the recess of the axial extension of enhancement section, the total length of front end and enhancement section is less than quarter wavelength and the length of enhancement section is less than half of amplitude transformer total length, the axial vibration that two at least potsherds work produced is passed through in proper order rear end, enhancement section and front end back amplitude can realize twice and amplify.
2. The large amplitude ultrasound transducer of claim 1, wherein the depth of the groove is less than one quarter of the diameter of the reinforcing section.
3. The large amplitude ultrasound transducer of claim 2, wherein the number of grooves is at least four, the at least four grooves being evenly spaced along the circumference of the reinforcing section.
4. The large amplitude ultrasound transducer of claim 2, wherein the cross-sectional shape of the recess is square or semicircular.
5. The large amplitude ultrasound transducer of any of claims 1-4, wherein the grooves are helical grooves having an angle of less than 30 °, or wherein the grooves are straight grooves extending in the axial direction of the reinforcing section.
6. The large amplitude ultrasound transducer of claim 1, wherein the reinforcing section and the front end are cylinders of uniform diameter throughout the axial direction and the diameter of the front end is greater than or equal to the diameter of the reinforcing section.
7. The large amplitude ultrasound transducer of claim 6, wherein the rear end comprises a cylindrical section distal to an end of the reinforcing section and a tapered transition section proximal to an end of the reinforcing section, the cylindrical section having a diameter greater than or equal to a diameter of the piezoelectric ceramic.
8. The large amplitude ultrasound transducer according to claim 1, wherein the diameter of the rear cover is not smaller than the diameter of the piezoelectric ceramic.
9. The large amplitude ultrasonic transducer of claim 1, wherein the number of the ceramic plates is two, and the polarization directions of the two ceramic plates are opposite; and/or
The material density of the front end, the reinforcing section and the rear end is less than the material density of the rear cover.
10. An ultrasonic surgical blade comprising the ultrasonic transducer of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310928389.5A CN116764924A (en) | 2023-07-26 | 2023-07-26 | Large-amplitude ultrasonic transducer and ultrasonic surgical knife |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310928389.5A CN116764924A (en) | 2023-07-26 | 2023-07-26 | Large-amplitude ultrasonic transducer and ultrasonic surgical knife |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116764924A true CN116764924A (en) | 2023-09-19 |
Family
ID=87993153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310928389.5A Pending CN116764924A (en) | 2023-07-26 | 2023-07-26 | Large-amplitude ultrasonic transducer and ultrasonic surgical knife |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116764924A (en) |
-
2023
- 2023-07-26 CN CN202310928389.5A patent/CN116764924A/en active Pending
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