CN102813549A - High power density piezoelectric transducer for ultrasonic surgical instrument - Google Patents
High power density piezoelectric transducer for ultrasonic surgical instrument Download PDFInfo
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- CN102813549A CN102813549A CN2012103065189A CN201210306518A CN102813549A CN 102813549 A CN102813549 A CN 102813549A CN 2012103065189 A CN2012103065189 A CN 2012103065189A CN 201210306518 A CN201210306518 A CN 201210306518A CN 102813549 A CN102813549 A CN 102813549A
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Abstract
The invention relates to a high power density piezoelectric transducer for an ultrasonic surgical instrument. The existing product has small ultrasonic power. The high power density piezoelectric transducer comprises a plurality of groups of piezoelectric transduction units, wherein a solid trumpet-shaped deformation transformation block is arranged between every two adjacent piezoelectric transduction units, and insulation layers are arranged between the piezoelectric transduction units and the deformation transformation blocks. Each piezoelectric transduction unit comprises a plurality of disc piezoelectric sheets which are coaxially arranged, metal electrodes are respectively arranged on the surfaces of the disc piezoelectric sheets, and two cone frustum-shaped metal caps are arranged between every two adjacent piezoelectric sheets. All the piezoelectric transduction units have the same height, the diameters of the piezoelectric sheets of the plurality of piezoelectric transduction units are sequentially reduced, and all the deformation transformation blocks have the same height. The center distance between two adjacent piezoelectric transduction units satisfies the dispersion equation. With the high power density piezoelectric transducer, the electroacoustic conversion efficiency is effectively increased, the ultrasonic irradiation directivity is improved, and the ultrasonic energy of a local area is improved within a limited space.
Description
Technical field
The invention belongs to technical field of medical instruments, be specifically related to be applied to the high power density piezoelectric transducer of ultrasonic surgical blade system, is the matching component of ultrasonic surgical blade system.
Background technology
The seventies in 20th century, the less invasive techniques fast development comprises that at present Minimally Invasive Surgery has been applied in nearly 10 operations such as department of general surgery, department of obstetrics and gynecology, cardiothoracic surgery, Urology Surgery, pediatric surgery, orthopaedics, department of cerebral surgery and ophthalmology.The development of Minimally Invasive Surgery has driven the development of operating theater instruments, like EUS, ultrasound knife, micro-surgical instrument, all kinds of intracavity Endo-GIAs etc.The operating theater instruments of thereupon emerging in large numbers has promoted the development of minimally invasive surgery conversely again, progressively develops into for branch's industry in the medical device industry.
Ultrasonic surgical blade is that a kind of cavitation effect that utilizes ultrasonic energy to cause causes tissue dewatering, solidifies, and then cracked a kind of operating theater instruments.This apparatus is proposed by Johson & Johnson at first, is controlled by minority foreign corporations such as Johson & Johnson at present.With respect to traditional electric knife operating theater instruments all; The maximum advantage of ultrasonic surgical blade is to cut and organize not to be to adopt to fulgerize burns the heat effect that causes; But the cavitation effect that adopts ultrasound wave to cause reaches and is similar to the ebullient effect of water, plays tissue and cuts and agglomerative effect.So its wound eschar still less, and the postoperative healing effect is better.
But also there are problems such as ultrasonic power is little in this kind modus operandi at present, and for big blood vessel, especially the abundant tissue cutting of fat descends severe.Under the situation that apparatus structure and material can't break through, improve the conversion efficiency of ultrasonic transducer, be the approach that improves ultrasonic effective energy output.
Summary of the invention
The object of the present invention is to provide a kind of high power density piezoelectric transducer that is used for ultrasonic surgical instruments.
The present invention includes many group piezoelectric energy-conversions unit, be provided with the deformation transform block between adjacent two piezoelectric energy-conversion unit, be provided with the insulating barrier that thickness is a between piezoelectric energy-conversion unit and the deformation transform block.
Described piezoelectric energy-conversion unit adopts the piezoelectric pile structure, and integral body is cylindrical, comprises the piezoelectric patches of the disk shape of a plurality of coaxial settings, and the surface of piezoelectric patches is provided with metal electrode; Described metal electrode is foil or metal film, covers the surface of piezoelectric patches, is connected with lead-in wire on the metal electrode; Be provided with two metal caps between two adjacent piezoelectric patches; Described metal cap is hollow truncated cone-shaped, and the end face of round platform seals into end face, the bottom surface opened of round platform; The end face of two metal caps is fixedly connected, and the edge that sidewall is positioned at the bottom surface is connected with the metal electrode on piezoelectric patches surface.
The material of said piezoelectric patches is doped PZT pottery or ZnO or AlN or PVDF.
All unitary height b of columniform piezoelectric energy-conversion that constitute piezoelectric transducer are identical, and the diameter of the unitary piezoelectric patches of a plurality of piezoelectric energy-conversions reduces successively.Same pole lead-in wire in all piezoelectric energy-conversion unit interconnects.
The deformation transform block is solid tubaeform block, and the end face of two circles is respectively at the unitary piezoelectric patches equal diameters of two piezoelectric energy-conversions that connects, and the stringcourse of its longitudinal section is a function y=x/e curve, and e is a math constant; The height c of deformation transform block meets following formula:
a+b+2c=L=?v?/ω
Wherein, ω is that the frequency of electric excitation signal, speed, the L that V is sonic propagation are adjacent two unitary centre distances of piezoelectric energy-conversion.
,, following on the basis of principle of conservation of energy because cross-sectional area reduces step by step to the microcephaly from the major part of flaring deformation transform block, microcephaly's flexible amplitude increases, and has played the effect that sonic wave amplitude amplifies.
The unitary height of each piezoelectric energy-conversion is identical, and the height of each deformation transform block is identical, and the thickness of each insulating barrier is identical; Therefore piezoelectric energy-conversion unit period profile vertically satisfies dispersion equation 1/L=ω/v, frequency be the sound wave that sends of the piezoelectric transducer of the signal of telecommunication excitation of ω in the space just in time crest fold mutually with crest; Trough is folded mutually with trough; That is to say that the deformation that different piezoelectric transducers produce all is elongation or all is to shorten, strengthened Overlay on axial some points.
The present invention has improved electro-acoustic conversion efficiency effectively, improves the radiating directivity of ultrasound wave, in limited space, improves the regional area ultrasonic energy.
Description of drawings
Fig. 1 is a cross section structure sketch map of the present invention;
Fig. 2 is the unitary cross section structure sketch map of piezoelectric energy-conversion among Fig. 1;
Fig. 3 is the structural representation of metal cap among Fig. 2.
The specific embodiment
As shown in Figure 1; The high power density piezoelectric transducer that is used for ultrasonic surgical instruments comprises three groups of piezoelectric energy-conversion unit 1 and two deformation transform blocks 2; Each deformation transform block 2 is arranged between adjacent two piezoelectric energy-conversion unit 1, and being provided with thickness between piezoelectric energy-conversion list 1 and the deformation transform block 2 is the insulating barrier 3 of a.First group of piezoelectric energy-conversion unit and second group of unitary centre distance L1 of piezoelectric energy-conversion equal second group of piezoelectric energy-conversion unit and the 3rd group of unitary centre distance L2 of piezoelectric energy-conversion.
As shown in Figure 2, piezoelectric energy-conversion unit 1 adopts the piezoelectric pile structure, and integral body is cylindrical, comprises the piezoelectric patches 1-1 of the disk shape of three coaxial settings, and the surface of piezoelectric patches 1-1 is provided with metal electrode 1-3.Metal electrode is foil or metal film, covers the surface of piezoelectric patches 1-1, is connected with lead-in wire on the metal electrode 1-1, is provided with two metal cap 1-2 between two adjacent piezoelectric patches.The material of piezoelectric patches is doped PZT pottery or ZnO or AlN or PVDF.
Shown in Fig. 2 and 3, metal cap is hollow truncated cone-shaped, and the end face of round platform seals into end face, the bottom surface opened of round platform, and the end face of two metal caps is fixedly connected, and the edge that sidewall is positioned at the bottom surface is connected with the metal electrode 1-3 on piezoelectric patches surface.
All unitary height b of columniform piezoelectric energy-conversion that constitute piezoelectric transducer are identical, and the diameter that constitutes three unitary piezoelectric patches of piezoelectric energy-conversion reduces successively.Same pole lead-in wire in all piezoelectric energy-conversion unit interconnects.
Deformation transform block 2 is solid tubaeform block, and the end face of two circles is respectively at the unitary piezoelectric patches equal diameters of two piezoelectric energy-conversions that connects, and the stringcourse k of its longitudinal section adopts function y=x/e curve, and e is a math constant; The height c of deformation transform block meets following formula:
a+b+2c=L=?v?/ω
Wherein, ω is that the frequency of electric excitation signal, speed, the L that V is sonic propagation are adjacent two unitary centre distances of piezoelectric energy-conversion.
The piezoelectric pile vibration of energising back; Piezoelectric patches produces axial deformation and radially deformation; Wherein radially deformation (shown in the solid arrow among Fig. 3) takes place in the radially deformation of piezoelectric patches drive metal cap; The metal cap its specific structure can with this radially deformation partly be converted into axial deformation (shown in the dotted arrow among Fig. 3), strengthened the yardstick of axial deformation, further improve device in the axial stretching ability.Owing to adopt the periodic structure setting,, then can improve the quality factor and the frequency selectivity of ultrasonic transducer simultaneously, can strengthen electric excitation signal greatly, suppress response noise if the frequency of its space periodicity and the excitation signal of telecommunication satisfies dispersion equation.Piezoelectric energy-conversion unit and deformation transform block cycle are provided with, and form the cascade state, and the flexible distance of further having amplified cutter head is increased work efficiency.
Claims (2)
1. the high power density piezoelectric transducer that is used for ultrasonic surgical instruments; Comprise many group piezoelectric energy-conversions unit; It is characterized in that: be provided with the deformation transform block between adjacent two piezoelectric energy-conversion unit, be provided with the insulating barrier that thickness is a between piezoelectric energy-conversion unit and the deformation transform block;
Described piezoelectric energy-conversion unit adopts the piezoelectric pile structure, and integral body is cylindrical, comprises the piezoelectric patches of the disk shape of a plurality of coaxial settings, and the surface of piezoelectric patches is provided with metal electrode; Described metal electrode is foil or metal film, covers the surface of piezoelectric patches, is connected with lead-in wire on the metal electrode, is provided with two metal caps between two adjacent piezoelectric patches; Described metal cap is hollow truncated cone-shaped, and the end face of round platform seals into end face, the bottom surface opened of round platform, and the end face of two metal caps is fixedly connected, and the edge that sidewall is positioned at the bottom surface is connected with the metal electrode on piezoelectric patches surface;
All unitary height b of columniform piezoelectric energy-conversion that constitute piezoelectric transducer are identical, and the diameter of the unitary piezoelectric patches of a plurality of piezoelectric energy-conversions reduces successively; Same pole lead-in wire in all piezoelectric energy-conversion unit interconnects;
The deformation transform block is solid tubaeform block, and the end face of two circles is respectively at the unitary piezoelectric patches equal diameters of two piezoelectric energy-conversions that connects, and the stringcourse of its longitudinal section is a function y=x/e curve, and e is a math constant; The height c of deformation transform block meets following formula:
a+b+2c=L=?v?/ω
Wherein, ω is that the frequency of electric excitation signal, speed, the L that V is sonic propagation are adjacent two unitary centre distances of piezoelectric energy-conversion.
2. the high power density piezoelectric transducer that is used for ultrasonic surgical instruments as claimed in claim 1 is characterized in that: the material of said piezoelectric patches is doped PZT pottery or ZnO or AlN or PVDF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210306518.9A CN102813549B (en) | 2012-08-27 | 2012-08-27 | High power density piezoelectric transducer for ultrasonic surgical instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210306518.9A CN102813549B (en) | 2012-08-27 | 2012-08-27 | High power density piezoelectric transducer for ultrasonic surgical instrument |
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| Publication Number | Publication Date |
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| CN102813549A true CN102813549A (en) | 2012-12-12 |
| CN102813549B CN102813549B (en) | 2014-11-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108262240A (en) * | 2018-03-28 | 2018-07-10 | 吉林大学 | A kind of PVDF ultrasonic transmitters of truncated conical shape |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005057687A (en) * | 2003-08-07 | 2005-03-03 | Seiko Epson Corp | Electrostatic transducer and ultrasonic speaker using the same |
| US20080222866A1 (en) * | 2005-11-28 | 2008-09-18 | Fujifilm Corporation | Multilayered piezoelectric element and method of manufacturing the same |
| CN102143422A (en) * | 2010-01-29 | 2011-08-03 | 柳杨 | Circular membrane piezoelectric ultrasonic transducer |
| CN202761388U (en) * | 2012-08-27 | 2013-03-06 | 杭州电子科技大学 | High power density piezoelectric transducer for ultrasound surgical instrument |
-
2012
- 2012-08-27 CN CN201210306518.9A patent/CN102813549B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005057687A (en) * | 2003-08-07 | 2005-03-03 | Seiko Epson Corp | Electrostatic transducer and ultrasonic speaker using the same |
| US20080222866A1 (en) * | 2005-11-28 | 2008-09-18 | Fujifilm Corporation | Multilayered piezoelectric element and method of manufacturing the same |
| CN102143422A (en) * | 2010-01-29 | 2011-08-03 | 柳杨 | Circular membrane piezoelectric ultrasonic transducer |
| CN202761388U (en) * | 2012-08-27 | 2013-03-06 | 杭州电子科技大学 | High power density piezoelectric transducer for ultrasound surgical instrument |
Non-Patent Citations (1)
| Title |
|---|
| 叶发根等: "一种新型扭转振动压电陶瓷超声换能器", 《压电与声光》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108262240A (en) * | 2018-03-28 | 2018-07-10 | 吉林大学 | A kind of PVDF ultrasonic transmitters of truncated conical shape |
| CN108262240B (en) * | 2018-03-28 | 2024-04-12 | 吉林大学 | PVDF ultrasonic transmitter in round table shape |
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| CN102813549B (en) | 2014-11-05 |
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