CN104225632A - Solid ultrasonic couplant and preparation method thereof - Google Patents
Solid ultrasonic couplant and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a solid ultrasonic couplant and a preparation method thereof. The solid ultrasonic couplant has a shape matched with a shape of an ultrasonic transducer of a focused ultrasonic launcher, and is prepared from konjac fine meal as a main raw material, wherein the content of glucomannan in the konjac fine meal is greater than 70%, and the viscosity is greater than 5000 mPa.s. The solid ultrasonic couplant is flexible, is rich in elasticity and smooth in surface, has the sound conduction performance close to water, and has a good ultrasonic conduction effect.
Description
Technical field
The present invention relates to a kind of solid ultrasonic couplant and preparation method thereof, particularly relate to a kind of Rhizoma amorphophalli glucomannan solid ultrasonic couplant and preparation method thereof.
Background technology
Focused ultrasound therapy has become a kind of more ripe medical skill.Cannot propagate in atmosphere due to ultrasonic, therefore current focus supersonic discharger all uses liquid ultrasonic coupling agent as transmitting medium.More general liquid ultrasonic coupling agent is de aerated water.Use in the transducer front of focus supersonic discharger one can the container of perfusion fluid.When focused ultrasound therapy, first using the perfusion of liquid ultrasonic coupling agent in a reservoir as by ultrasonic by the medium transducer to tissue.
Be full of in the process of container at perfusion fluid, need to get rid of bubble completely to avoid bubble to the interference of ultrasonic conducting.This operation is comparatively inconvenient.Be no matter in use or in storage and transportation, if air is dissolved in liquid coupling agent again, its sound conductive performance will be caused to decline.This just needs liquid ultrasonic coupling agent at every moment to remain under airtight condition, causes its transport, storage and use complicated thus and economy decline.Simultaneously, the corrosion that may cause transducer because of liquid comes into contact and leak of liquid are to the potential hazard of focus supersonic discharger electrical safety, all to causing the design of focused ultrasound devices and using complicated, thus the increase of Financial cost and the decline of convenience can be caused.
Summary of the invention
For the problems referred to above, the invention provides a kind of solid ultrasonic couplant, with the liquid ultrasonic coupling agent used in its replacement focus supersonic discharger, improve operation ease and the economy of ultrasonic coupling agent in focused ultrasound therapy.
Solid ultrasonic couplant provided by the present invention, there is the shape with the mating shapes of the ultrasonic transducer of focus supersonic discharger, be be that primary raw material is made with konjaku powder, in described konjaku powder, the content of glucomannoglycan is greater than 70%, viscosity is greater than 5000mPas.
Wherein, the granularity of described konjaku powder is 80 order to 120 orders.
The technical performance of described solid ultrasonic couplant is as follows: the velocity of sound is between 1520-1620m/s, and specific acoustic impedance is between 1.5-1.6x106pa.s/m, and acoustic attenuation is for being not more than 0.05dB/cm.MHz.
The surface pH value of described solid ultrasonic couplant is 5.5-8.0.
Present invention also offers the preparation method of above-mentioned solid ultrasonic couplant, comprise the steps:
1) aqueous solution of konjaku powder is carried out basification, in described konjaku powder, the content of glucomannoglycan is greater than 70%, viscosity is greater than 5000mPas;
2) aqueous solution of the konjaku powder after alkalization is filled in mould;
3) being cured process, that the aqueous solution of the konjaku powder of alkalization is converted into is solid-state;
4) demoulding, cleaning, to neutral, obtains solid-state couplant;
Wherein, described solid-state couplant has the shape with the mating shapes of the ultrasonic transducer of focus supersonic discharger.
Wherein, in the aqueous solution of described konjaku powder, the mass concentration of konjaku powder is between 2%-8%.
Wherein, the temperature of the aqueous solution of described konjaku powder is between 10 DEG C-45 DEG C.
Wherein, the aqueous solution of described konjaku powder is through vacuum defoamation process.
Wherein, the temperature of described vacuum defoamation process is between 10 DEG C-45 DEG C.
Wherein, described basification makes the pH value of the aqueous solution of konjaku powder reach more than 9.0.
Wherein, the basifier used in described basification is sodium hydroxide or alkaline sodium salt.
Wherein, described step 1) and step 2) can carry out under vacuum.
Wherein, described cured is make to solidify more than 1 hour in the thermal environment of the aqueous solution of alkalization konjaku powder more than 75 DEG C.
Wherein, more than the speed raised temperature to 75 DEG C of 5 DEG C is not more than with per minute in described cured.
Pliable and tough and the high resilience of solid ultrasonic couplant of the present invention, any surface finish, its sound conductive performance and water close, ultrasonic conducting is respond well.In addition, solid ultrasonic couplant of the present invention is solid-state, thus transports, to store and easy to use and economical.
Accompanying drawing explanation
Fig. 1 represent solid-state couplant and ultrasonic transducer in a specific embodiment of the present invention assemble after schematic diagram.
Fig. 2 represents the schematic diagram of mould in a specific embodiment of the present invention.
Detailed description of the invention
The present invention relates to a kind of solid ultrasonic couplant, the solid ultrasonic couplant that the present invention relates to as in focused ultrasound therapy by a kind of ultrasound conductive medium between transducer to tissue.
Solid ultrasonic couplant of the present invention, it has the shape with the mating shapes of the ultrasonic transducer of focus supersonic discharger, is to make for primary raw material with the konjaku powder that glucomannoglycan content is greater than 70%, viscosity is greater than 5000mPas.Konjaku powder is a kind of bio-organic materials, has good biocompatibility, harmless to human-body safety, has been widely used in food, medicine and other fields.In focused ultrasound therapy process, the solid-state couplant of Rhizoma amorphophalli can directly contact with tissue for a long time, comfortable to human-body safety.Wherein, the content of the glucomannoglycan of konjaku powder is greater than 70%, viscosity is greater than 5000mPas and can ensures that prepared solid ultrasonic couplant has good physics and biological property.Konjaku powder is preferably the konjaku powder of food stage, to ensure the requirement of biological safety.The granularity of konjaku powder is larger, and dissolubility is better, but the dispersibility in solute is just deteriorated, and can increase stirring difficulty.Preferably, konjaku powder granularity is advisable between 80 order to 120 orders.
The specification size of solid ultrasonic couplant of the present invention sets as required, its binding face primarily of solid-state couplant and ultrasonic transducer, ultrasonic transducer to tissue position distance, ultrasonic enter tissue time three, the face of penetrating of wearing factor determine.The shape of solid ultrasonic couplant of the present invention is except the mating shapes of the ultrasonic transducer with focus supersonic discharger, and it is also conceivable to install needs, can be cylinder or taper shape usually.
In a detailed description of the invention, according to the situation of focus supersonic discharger, solid-state couplant design shape is approximate circle cylinder, diameter 10cm, high 6cm, be plane with human contact face, be sphere with ultrasonic transducer binding face, sphere radian is consistent with transducer.After solid-state couplant and ultrasonic transducer assemble as shown in Figure 1.In Fig. 1,1 represents solid-state couplant, the ultrasonic transducer of 2 expression focus supersonic dischargers.
Solid ultrasonic couplant of the present invention can be directly installed on the transducer front of focus supersonic discharger by the better simply fixture of use structure, simple to operation.
Pliable and tough and the high resilience of solid ultrasonic couplant of the present invention, any surface finish, its sound conductive performance and water close, ultrasonic conducting is respond well.
The basic mechanical design feature of solid ultrasonic couplant of the present invention is as follows:
The velocity of sound is between 1520-1620m/s, and specific acoustic impedance is between 1.5-1.6x106pa.s/m, and acoustic attenuation is for being not more than 0.05dB/ (cm.MHz).
The surface pH value of solid ultrasonic couplant of the present invention is 5.5-8.0.
Solid ultrasonic couplant of the present invention can be prepared as follows:
1) glucomannoglycan content is greater than 70%, aqueous solution that viscosity is greater than the konjaku powder of 5000mPas carries out basification;
2) aqueous solution of the konjaku powder after alkalization is filled in mould;
3) being cured process, that the aqueous solution of the konjaku powder of alkalization is converted into is solid-state;
4) demoulding, cleaning, to neutral, obtains solid-state couplant;
Wherein, described solid-state couplant has the shape with the mating shapes of the ultrasonic transducer of focus supersonic discharger.
Wherein konjaku powder demonstrates good plasticity and conformal performance in preparation process, thus can according to the supporting requirement of the ultrasonic transducer of different focus supersonic discharger, and the various shape made and specification, to be applicable to various intensity focused ultrasound therapy.
The mould used in above-mentioned preparation method shape needed for solid-state couplant and specification size can pollute the temperature-resistant material not easily deforming simultaneously and wear and tear make by not producing konjaku powder, such as glass, rustless steel etc.Mould should be designed to the structure that can seal, and after having noted the aqueous solution of konjaku powder, seals to avoid moisture drain evaporation in solidification process too much completely.
In a concrete embodiment, mould is made up of rustless steel, as shown in Figure 2.Its shape is approximate circle tubular, and bottom surface is sphere, and inside diameter is 10cm, internal height is 6cm.This mould uses seal cover to reach sealing effectiveness.
In above-mentioned preparation method, use the aqueous solution of konjaku powder in purified water, fully to dissolve gained, to ensure that prepared couplant has good acoustical behavior for konjaku powder.
Wherein, the mass concentration of konjaku powder is preferably between 2%-8%.The excessive concentration of konjaku powder can cause the sound conductive performance of the solid-state couplant prepared to decline; The too low meeting of concentration of konjaku powder causes pliability and the flexibility decrease of the solid-state couplant prepared.
Wherein, the temperature of the aqueous solution of described konjaku powder is preferably between 10 DEG C-45 DEG C, and the too low dissolubility that can reduce konjaku powder of temperature, temperature is too high there will be excess water evaporation, causes mass concentration deviation larger.
In above-mentioned preparation method, the dissolubility of the konjaku powder that the requirement of the content of the glucomannoglycan of konjaku powder, viscosity and granularity can ensure and solid-state formability.
In above-mentioned preparation method, the aqueous solution of konjaku powder is through vacuum defoamation process.Bubble in the aqueous solution of abundant removing konjaku powder can avoid the issuable impact on ultrasonic conducting performance.Deaeration treatment temperature should be advisable between 10 DEG C-45 DEG C.
In above-mentioned preparation method, described basification is add basifier to make the aqueous solution of konjaku powder become alkalescence.The pH value that should alkalize to the aqueous solution of konjaku powder reaches more than 9.0 and is advisable, alkalization degree deficiency can cause the not enough or solid-state couplant prepared of state of cure pliability, elasticity is not enough.
Wherein, the alkaline reagent that basifier preferred molecular weight is less-such as sodium hydroxide or alkaline sodium salt, the example such as sodium carbonate of alkaline sodium salt-to make the density of the couplant prepared close with water as far as possible.The stronger basifier of alkalescence needs to use its aqueous solution, and weakly alkaline basifier then can use pressed powder, adds in the aqueous solution of konjaku powder when rapid stirring.When adding aqueous solution, the mass concentration of konjaku powder should do not made to be diluted to less than 2%.
Wherein, alkalinization should carry out under vacuum, to avoid there is bubble formation in whipping process.
In above-mentioned preparation method, when mould volume is comparatively large or planform is more complicated, for avoiding forming bubble in filling process, perfusion can be carried out under vacuum.
In above-mentioned preparation method, described cured is that the aqueous solution of alkalization konjaku powder is solidified in thermal environment.The thermal environment temperature of cured should reach more than 75 DEG C, is preferably 75 DEG C-200 DEG C, is more preferably 75 DEG C-100 DEG C, and aqueous solution retention time in thermal environment of alkalization konjaku powder should be greater than 1 hour, to ensure the adequacy of solidifying.Curing deformation is caused to be not more than more than the speed raised temperature to 75 DEG C of 5 DEG C with per minute for avoiding too fast nonuniform heating.
In above-mentioned preparation method, the solid-state couplant after the demoulding fully should soak, clean in water, thoroughly to remove residual consolidation liquid, until eluent is in neutral.
Be below specific embodiments of the invention, described embodiment is for describing the present invention, instead of restriction the present invention.
Embodiment 1:
The content 70% of glucomannoglycan, viscosity 5000mPas, granularity 120 object food stage konjaku powder are dissolved in purified water the aqueous solution of the konjaku powder obtaining 8%.The temperature of whole course of dissolution controls at about 45 DEG C.The aqueous solution of konjaku powder is placed in lower 24 hours of the vacuum condition of temperature 45 C ,-0.09Mpa, abundant deaeration.When vacuum stirring, added by sodium hydrate aqueous solution in the aqueous solution of konjaku powder, make the pH value of the aqueous solution of konjaku powder rise to 11, its mass concentration drops to about 6% simultaneously.The aqueous solution of the konjaku powder of alkalization is filled in mould, then the mould of good seal is placed in calorstat.Slowly be heated to 75 DEG C with the speed of 5 DEG C per minute, keep 3 hours.Couplant after solidification is poured out from mould, soaking and washing in clear water, often soak 1 hour, rinse and change water once.After 5 times, soak water through the test of pH reagent paper in neutral, just the obtained solid-state couplant of Rhizoma amorphophalli.Pliable and tough and the high resilience of the solid-state couplant of this Rhizoma amorphophalli, any surface finish.
Embodiment 2:
The content 78% of glucomannoglycan, viscosity 7000mPas, granularity 100 object food stage konjaku powder are dissolved in purified water the aqueous solution of the konjaku powder obtaining 6%.The temperature of whole course of dissolution controls at about 30 DEG C.The aqueous solution of konjaku powder is placed in lower 30 hours of the vacuum condition of temperature 30 DEG C ,-0.09Mpa, abundant deaeration.When vacuum stirring, added by aqueous sodium carbonate in the aqueous solution of konjaku powder, make the pH value of the aqueous solution of konjaku powder rise to 10, its mass concentration drops to about 5% simultaneously.The aqueous solution of the konjaku powder of alkalization is filled in mould, then the mould of good seal is placed in calorstat.Slowly be heated to 90 DEG C with the speed of 5 DEG C per minute, keep 2 hours.Couplant after solidification is poured out from mould, soaking and washing in clear water, often soak 1 hour, rinse and change water once, after 5 times, soak water through the test of pH reagent paper in neutral, just the obtained solid-state couplant of Rhizoma amorphophalli.Pliable and tough and the high resilience of the solid-state couplant of this Rhizoma amorphophalli, any surface finish.
Embodiment 3:
The content 85% of glucomannoglycan, viscosity 10000mPas, granularity 80 object food stage konjaku powder are dissolved in purified water the aqueous solution of the konjaku powder obtaining 2%.The temperature of whole course of dissolution controls at about 10 DEG C.The aqueous solution of konjaku powder is placed in lower 36 hours of the vacuum condition of temperature 10 DEG C ,-0.09Mpa, abundant deaeration.When vacuum stirring, powdered sodium carbonate is added in the aqueous solution of konjaku powder, make the pH value of the aqueous solution of konjaku powder rise to 9.The aqueous solution of the konjaku powder of alkalization is filled in mould, then the mould of good seal is placed in calorstat.Slowly be heated to 100 DEG C with the speed of 5 DEG C per minute, keep 1 hour.Couplant after solidification is poured out from mould, soaking and washing in clear water, often soak 1 hour, rinse and change water once.After 5 times, soak water through the test of pH reagent paper in neutral, just the obtained solid-state couplant of Rhizoma amorphophalli.Pliable and tough and the high resilience of the solid-state couplant of this Rhizoma amorphophalli, any surface finish.
Randomly draw 10 finished products in the solid-state couplant of the chitosan prepared from embodiment 1-3, detect basic mechanical design feature index.Result is as shown in the table:
| Embodiment | The velocity of sound | Specific acoustic impedance | Acoustic attenuation | Surface pH value |
| 1 | 1590m/s | 1.57x10 6pa.s/m | 0.048dB/(cm.MHz) | 7.5 |
| 1 | 1580m/s | 1.56x10 6pa.s/m | 0.047dB/(cm.MHz) | 8.5 |
| 2 | 1590m/s | 1.57x10 6pa.s/m | 0.048dB/(cm.MHz) | 8.4 |
| 2 | 1580m/s | 1.56x10 6pa.s/m | 0.047dB/(cm.MHz) | 7.8 |
| 2 | 1600m/s | 1.58x10 6pa.s/m | 0.048dB/(cm.MHz) | 7.5 |
| 3 | 1600m/s | 1.58x10 6pa.s/m | 0.048dB/(cm.MHz) | 7.6 |
| 3 | 1590m/s | 1.57x10 6pa.s/m | 0.047dB/(cm.MHz) | 7.7 |
| 3 | 1590m/s | 1.57x10 6pa.s/m | 0.047dB/(cm.MHz) | 8.8 |
| 3 | 1610m/s | 1.59x10 6pa.s/m | 0.049dB/(cm.MHz) | 7.9 |
| 3 | 1610m/s | 1.59x10 6pa.s/m | 0.049dB/(cm.MHz) | 7.5 |
The above results shows, the solid-state couplant of chitosan of the present invention, sound conductive performance and water close, ultrasonic conducting is respond well, can as the transmitting medium used in focus supersonic discharger.
Claims (14)
1. a solid ultrasonic couplant, it has the shape with the mating shapes of the ultrasonic transducer of focus supersonic discharger, be be that primary raw material is made with konjaku powder, in described konjaku powder, the content of glucomannoglycan is greater than 70%, viscosity is greater than 5000mPas.
2. solid ultrasonic couplant according to claim 1, is characterized in that, the granularity of described konjaku powder is 80 order to 120 orders.
3. solid ultrasonic couplant according to claim 1, it is characterized in that, the technical performance of described solid ultrasonic couplant is as follows: the velocity of sound is between 1520-1620m/s, and specific acoustic impedance is between 1.5-1.6x106pa.s/m, and acoustic attenuation is for being not more than 0.05dB/cm.MHz.
4. solid ultrasonic couplant according to claim 1, is characterized in that, the surface pH value of described solid ultrasonic couplant is 5.5-8.0.
5. a preparation method for solid ultrasonic couplant, comprises the steps:
1) aqueous solution of konjaku powder is carried out basification, in described konjaku powder, the content of glucomannoglycan is greater than 70%, viscosity is greater than 5000mPas;
2) aqueous solution of the konjaku powder after alkalization is filled in mould;
3) being cured process, that the aqueous solution of the konjaku powder of alkalization is converted into is solid-state;
4) demoulding, cleaning, to neutral, obtains solid-state couplant;
Wherein, described solid-state couplant has the shape with the mating shapes of the ultrasonic transducer of focus supersonic discharger.
6. preparation method according to claim 5, is characterized in that, in the aqueous solution of described konjaku powder, the mass concentration of konjaku powder is between 2%-8%.
7. preparation method according to claim 6, is characterized in that, the temperature of the aqueous solution of described konjaku powder is between 10 DEG C-45 DEG C.
8. preparation method according to claim 5, is characterized in that, the aqueous solution of described konjaku powder is through vacuum defoamation process.
9. preparation method according to claim 8, is characterized in that, the temperature of described vacuum defoamation process is between 10 DEG C-45 DEG C.
10. preparation method according to claim 5, is characterized in that, described basification makes the pH value of the aqueous solution of konjaku powder reach more than 9.0.
11. preparation methoies according to claim 10, is characterized in that, the basifier used in described basification is sodium hydroxide or alkaline sodium salt.
12. preparation methoies according to claim 5, is characterized in that, described step 1) and step 2) can carry out under vacuum.
13. preparation methoies according to claim 5, is characterized in that, described cured is make to solidify more than 1 hour in the thermal environment of the aqueous solution of alkalization konjaku powder more than 75 DEG C.
14. preparation methoies according to claim 13, is characterized in that, are not more than more than the speed raised temperature to 75 DEG C of 5 DEG C in described cured with per minute.
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| CN105423968A (en) * | 2015-10-28 | 2016-03-23 | 湘潭宏远电子科技有限公司 | Transverse wave couplant for power station boiler steel pipe inner wall oxide-film high frequency ultrasonic measurement, and preparation method thereof |
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| CN107412793A (en) * | 2017-07-26 | 2017-12-01 | 广州沁瀚生物科技有限公司 | A kind of biological ultrasonic coupling paster and its industrialized process for preparing |
| CN107510851A (en) * | 2017-08-31 | 2017-12-26 | 邹伟华 | A kind of medical supersonic coupling pad and preparation method thereof |
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