130 results about "Pulsed Ultrasound" patented technology

A design and a manufacturing method of ultrasound transducers based on films of ferro-electric ceramic material is presented, the transducers being particularly useful for operating at frequencies above 10 MHz. The designs also involve acoustic load matching layers that provides particularly wide bandwidth of the transducers, and also multiple electric port transducers using multiple piezoelectric layers, for multi-band operation of the transducers over an even wider band of frequencies that covers ~4 harmonics of a fundamental band. A transceiver drive system for the multi-port transducers that provides simple selection of the frequency bands of transmitted pulses as well as transmission of multi-band pulses, and reception of scattered signals in multiple frequency bands, is presented. The basic designs can be used for elements in a transducer array, that provides all the features of the single element transducer for array steering of the focus and possibly also direction of a pulsed ultrasound beam at high frequencies and multi-band frequencies. The manufacturing technique can involve tape-casting of the ceramic films, deposition of the ceramic films onto a substrate with thick film printing, sol-gel, or other deposition techniques, where manufacturing methods for load matching layers and composite ceramic layers are described.

A method and apparatus for combining therapeutic pulsed or continuous-wave ultrasound with diagnostic pulsed ultrasound are described. In both a therapeutic mode and in a diagnostic mode, the ultrasound is administered from a single probe to a patient suffering from thrombosis. The ultrasound can have the same or different frequency ranges in the diagnostic and therapeutic modes. The pulsed or continuous-wave ultrasound in the therapeutic mode enhances a lysing effect of a thrombolytic agent. The pulsed ultrasound in the diagnostic mode allows monitoring of blood flow to locate a thrombus, to determine an optimal window to administer the therapeutic pulsed ultrasound, and to detect when recanalization has occurred. If an operator attends the device, a graphical display operates during the diagnostic mode to display an image representative of the blood flow.

An acoustic transmitter produces a pulsed ultrasound waveform which is transmitted through body tissues to an implanted receiver-stimulator device. The waveform has an acoustic amplitude, pulse width, and pulse repetition period, which corresponds to a pacing pulse electrical amplitude, pacing pulse width, and pacing cycle length, respectively. The receiver-stimulator device intercepts at least a portion of the transmitted acoustic energy and coverts that acoustic energy into electrical energy using piezoelectric or other devices. This electrical energy is applied to circuitry, which produces a desired stimulating pulse waveform, which is then applied to tissue-contacting electrodes.

An ultrasound method and medical devices using same provide for various techniques of sampling blood flow velocity, e.g., at several sampling rates. To minimize the energy required for ultrasound monitoring, pulsed Doppler signal packages provided by a pulsed ultrasound circuit are switched in such a way that the repetition rate is the lowest possible and yet sufficiently high to be able to record the blood flow velocity within the heart. For example, an ultrasound circuit may be activated only within a part of the cardiac cycle designated as the Doppler Measurement Interval (DMI); the ultrasound circuit may be switched between an on state and an off state during the DMI; and / or the ultrasound circuit may also be switched on and off in different sampling modes: detection mode and measurement mode (e.g., using different sampling rates).

Methods and systems for non-invasive neuromodulation of the spinal cord utilize a transducer to deliver pulsed ultrasound energy to up regulate or down regulate neural targets for the treatment of pain and other disease conditions. The systems provide control of direction of the energy emission, intensity, frequency, pulse duration, pulse pattern, mechanical perturbation, and phase / intensity relationships to achieve up regulation and / or down regulation. One embodiment focuses an elongate tubular ultrasound beam which can be aligned with a target region of the spinal cord.

An ultrasound method and medical devices using same provide for various techniques of sampling blood flow velocity, e.g., at several sampling rates. To minimize the energy required for ultrasound monitoring, pulsed Doppler signal packages provided by a pulsed ultrasound circuit are switched in such a way that the repetition rate is the lowest possible and yet sufficiently high to be able to record the blood flow velocity within the heart. For example, an ultrasound circuit may be activated only within a part of the cardiac cycle designated as the Doppler Measurement Interval (DMI); the ultrasound circuit may be switched between an on state and an off state during the DMI; and / or the ultrasound circuit may also be switched on and off in different sampling modes: detection mode and measurement mode (e.g., using different sampling rates).

For use in acoustic micro imaging, a method (and implementing apparatus) is disclosed for creating a 4D virtual sample data memory. The method comprises employing a pulsed ultrasonic microscope probe to interrogate a sample at three-dimensionally varied locations in the sample. Data developed by the microscope probe includes for each location interrogated a digitized A-scan for that location. The developed data is stored in a data memory.

The invention provides an ultrasonic detection imaging method of a diffusion welding connecting interface in a tubular compound piece and belongs to the technical field of ultrasonic non-destructive test. A spherical face focusing ultrasonic transducer is immersed by stimulating high-wideband and narrow-pulse water through adopting electric pulse with adjustable frequency; water immersion and coupling are carried out; the transducer can penetrate into the inner circle of the tubular compound piece; the transducer radiates high-wideband and narrow-pulse ultrasounds to be vertically emitted into the inner wall of the compound piece under the excitation of the electric pulse and the ultrasounds are transmitted into a medium of the compound piece in a radial direction; and meanwhile, reflection echoes are generated on the diffusion welding connecting interface. The transducer can carry out full-measurement scanning on the inner wall of the tubular compound piece and receive the echoes to obtain a full-wave-train ultrasonic signal of the diffusion welding connecting interface. Software is used for carrying out time-frequency domain conversion on the full-wave-train ultrasonic signal, and characteristic extraction and imaging analysis are carried out on the ultrasonic signal, so as to obtain a quantitative direct result of the diffusion welding connecting quality. Leaked detection and incorrect detection problems of diffusion welding defect detection are reduced, and the objectiveness and reliability of the diffusion welding defect detection are improved.

An acoustic fluid level sensor for use in a chamber contained in a surgical cassette. The sensor has an ultrasound transducer mounted on the outside of the bottom of a fluid chamber and is acoustically coupled to the chamber. The transducer sends a pulse ultrasound signal through the chamber and any liquid in the chamber. The signal is reflected back by the air / liquid interface and captured by the transducer. The time required for the signal to travel to and from the transducer will vary with the amount of fluid in the chamber and is indicative of the level of fluid in the chamber.

A design and a manufacturing method of ultrasound transducers based on films of ferro-electric ceramic material is presented, the transducers being particularly useful for operating at frequencies above 10 MHz. The manufacturing technique can involve tape-casting of the ceramic films, deposition of the ceramic films onto a substrate with thick film printing, sol-gel, or other deposition techniques, where manufacturing methods for load matching layers and composite ceramic layers are described. The designs also involve acoustic load matching layers that provide particularly wide bandwidth of the transducers, and also multi-band operation of the transducers. The basic designs can be used for elements in a transducer array, that provides the frequency characteristics of the single element transducers, for array steering of the focus and possibly also direction of a pulsed ultrasound beam at high frequencies and multi-band frequencies.

The invention relates to a method for preparing a composite material, which comprises the following steps of: putting a basal body subjected to pretreatment into a conventional electroplating bath, and applying an electric field and an ultrasonic field on the plating bath with an ultrasonic generator and a pulsing power source. The process of pulse-ultrasound electrodeposition generally comprises the following steps of: 1, elecroplating pretreatment comprising pretreatment of the basal body and preparation of electroplate liquid; 2, electrodeposition process: putting the basal body which is pretreated in the step one into the prepared electroplate liquid for electrodeposition; and3, post treatment of plating parts, mainly comprising the working procedures of ultrasonic cleaning for the plating parts which are deposited in the step two and anhydrous alcohol cleaning. In the invention, in the electroplate liquid containing nickel and iron ions and insoluble nanoparticles, the nanoparticles are uniformly distributed in the liquid by using ultrasonic stirring, the nanoparticles and substrate metal ions are simultaneously deposited to obtain the ferromagnetic nano composite material composed of substrate metal nickel-iron and the nanoparticles under the condition that positive and negative pulse current or voltage are applied.

The invention discloses a mineral nutrient elements-enriched deep-sea small-molecular cluster water and a preparation method and cosmetic applications of the deep-sea small-molecular cluster water. The preparation method of deep-sea small-molecular cluster water comprises the steps of adding 80-120g mineralizing and activating preparation material into per liter of desalinized seawater, and processing the mixture by impulse ultrasound for 20-40 min to obtain the deep-sea small-molecular cluster water, wherein the ultrasound time / interval time is 3 / 5-2 / 3, the ultrasonic power is 850-1000W / L and the ultrasonic temperature of 30-60 DEG C; the mineralizing and activating preparation materials contain 15-30% of medical stone, 40-60% of Tourmaline weak-base stone and 30-50% of far infrared stone based on a total mass fraction of 100%, or contain 50-70% of Tourmaline weak-base stone and 30-50% of far infrared stone based on a total mass fraction of 100%. The deep-sea small-molecular cluster water can replace water that is used in preparation of various cosmetics and water that is used in synthesis and preparation of various components, and the prepared cosmetics have various physicochemical properties significantly superior to the cosmetics prepared by deionized water; moreover, the cosmetics can effectively balance pH value of skin and hair, and quickly compensate active water to keep the skin moisturized for a long period.

A system and method of performing ultrasound modulated optical tomography. Ultrasound is delivered into a target voxel in an anatomical structure, and sample light is delivered into the anatomical structure, whereby a portion of the sample light passing through the target voxel is scattered by the biological tissue as signal light, and a portion of the sample light not passing through the target voxel is scattered by the anatomical structure as background light. The ultrasound and sample light are pulsed in synchrony, such that only the signal light is frequency shifted by the ultrasound. Multiple pulses of the sample light are delivered into the anatomical structure for each pulse of the ultrasound delivered into the target voxel. Reference light is combined with the signal light and background light to generate an interference light pattern, which is sequentially modulated to generate different interference light patterns, which are detected.

The invention discloses a method for measuring the acoustic impedance of a thin layer based on a sound pressure reflection coefficient power spectrum, belonging to the technical field of ultrasonic nondestructive testing and evaluating of materials. The method comprises the steps of: acquiring aliasing signals formed by interface reflection echoes from water and an upper surface of the thin layer as well as from the water and a lower surface of the thin layer by using a pulsed ultrasound water logging echo system, acquiring an upper surface echo signal of a standard test block, performing FFT (Fast Fourier Transform) on the two signals respectively, and performing further processing to obtain the sound pressure reflection coefficient power spectrum; and then, performing low-pass filtering and band-pass filtering on the power spectrum to solve relevant coefficients in a power spectrum expression, and substituting the coefficients into an equation to solve the acoustic impedance of the thin layer. The method disclosed by the invention can be used for solving the acoustic impedance at the same time under the condition that any parameters of the thin layer are unknown, and the defect that part of parameters of the thin layer need to be known to obtain other parameters in the prior art is overcome.

The invention provides a preparation method of high-purity egg yolk phosphatidylcholine (PC), relating to the field of production of foods and medicinal ingredients. The preparation method comprises the following steps of: picking fresh eggs, washing the eggs, disinfecting, and separating egg white from egg yolk to obtain a yolk liquid; diluting with a certain amount of pure water, adding to an ultrasonic extracting tank, leaching repeatedly 1-5 times with pulse ultrasonic waves by taking 80-95 percent ethanol as a solvent, concentrating and drying to obtain a crude PC extract; putting the crude PC extract into a subcritical extraction kettle, performing subcritical countercurrent leaching 1-5 times by taking liquefied propane or butane as a solvent, extracting in the material-liquid ratio of 1:(1-6) at the extracting temperature of 10-90 DEG C under the extracting pressure of 0.2-10.0MPa for 10-20 minutes, and desolventizing under reduced pressure to obtain an oil-free PC compound; and lastly, further refining by adopting magnetic nanoparticles to obtain high-purity yolk PC. The yield of the yolk PC prepared with the method is increased greatly, and the purity is over 98 percent.

The invention discloses a transcranial ultrasonic brain regulating and controlling method and device. According to the transcranial ultrasonic brain regulating and controlling method, short-pulse ultrasounds generated by a focused ultrasonic transducer pass through an ultrasonic coupling medium and then are transmitted to the head of a sample, and then nervous physiological change is caused by the mechanical effect; a focused ultrasonic detector is driven by a three-dimensional electric scanning platform to achieve scanning and then ultrasonic stimulation is carried out on different parts of the head. The transcranial ultrasonic brain regulating and controlling device comprises a water tank filled with the ultrasonic coupling medium, the focused ultrasonic transducer, a power amplifier, a signal generator, the three-dimensional electric scanning platform, a driving motor, a computer provided with motor control software, a connecting rod and a plastic film, wherein the focused ultrasonic transducer, the power amplifier and a function generator are electrically connected in sequence, the three-dimensional electric scanning platform, the driving motor, and the computer provided with the motor control software are electrically connected in sequence, and the focused ultrasonic transducer is connected with the three-dimensional electric scanning platform through the connecting rod. The transcranial ultrasonic brain regulating and controlling method and device have the advantage of being capable of achieving multidirectional transcranial ultrasonic brain regulation and control.

The invention discloses a method for processing pot-stewed meat products adopting a pulsed electric field and pulsed ultrasound. According to the method, the salting process is assisted in and optimized through the pulsed electric field, the pulsed ultrasound is used for deep disinfection, production efficiency can be effectively improved, pot-stewed meat quality is stabilized, a pot-stewed meat shelf life is prolonged, main components and sensory quality of the pot-stewed meat cannot remarkably changed, and the flavor and taste of the pot-stewed meat products can be maintained to the largest extent.

A design and a manufacturing method of ultrasound transducers based on films of ferro-electric ceramic material is presented, the transducers being particularly useful for operating at frequencies above 10 MHz. The designs also involve acoustic load matching layers that provides particularly wide bandwidth of the transducers, and also multiple electric port transducers using multiple piezoelectric layers, for multi-band operation of the transducers over an even wider band of frequencies that covers ~4 harmonics of a fundamental band. A transceiver drive system for the multi-port transducers that provides simple selection of the frequency bands of transmitted pulses as well as transmission of multi-band pulses, and reception of scattered signals in multiple frequency bands, is presented. The basic designs can be used for elements in a transducer array, that provides all the features of the single element transducer for array steering of the focus and possibly also direction of a pulsed ultrasound beam at high frequencies and multi-band frequencies. The manufacturing technique can involve tape-casting of the ceramic films, deposition of the ceramic films onto a substrate with thick film printing, sol-gel, or other deposition techniques, where manufacturing methods for load matching layers and composite ceramic layers are described.

The invention discloses a preparation method of microporous starch having a high specific surface area. The preparation method adopts native starch as a raw material and comprises the following steps of removing proteins, lipid and impurities of native starch, carrying out primary starch acid hydrolysis to a limited degree by low-frequency pulsed ultrasound induction, and carrying out enzymatic hydrolysis by amylase under the conditions of low-frequency pulsed ultrasound induction to obtain the microporous starch having a high specific surface area, wherein apertures having appropriate aperture sizes and appropriate depth are formed on the whole surface of the microporous starch having a high specific surface area. The specific surface area of the microporous starch obtained by the preparation method is larger than that of microporous starch obtained by a single enzymatic hydrolysis method by above 60%. A water and oil adsorption capability of the microporous starch obtained by the preparation method is higher than that of the microporous starch obtained by the single enzymatic hydrolysis method by above 30%.

The invention discloses a method for preparing ginger extract with aid of efficient and circulatory pulsed ultrasound wave. The method comprises the following steps: processing a ginger leaching process with the aid of circulatory pulsed ultrasound wave, and regulating and controlling the ginger leaching process by adjusting frequency and power of the ultrasound wave, working time and pulsing time. Results show that compared with the ginger extract obtained by leaching with a solvent, the physical and chemical indicators of the ginger extract obtained by leaching with the aid of in-vitro circulatory pulsed ultrasound wave are greatly improved; meanwhile, the time for leaching with the aid of in-vitro circulatory pulsed ultrasound wave is shortened by 4 / 5; the using amount of the solvent is reduced by 30%. On the basis of not changing the basic process of preparing the ginger leaching liquid, the in-vitro circulatory pulsed ultrasound wave aiding measures are applied, thereby improving the utilization rate of the ginger, shortening the extraction time, saving the use amount of the extraction solvent and bringing high economic, social and environmental benefits.

The invention relates to a liver fat detection system based on ultrasound. An ultrasound generator transmits pulse ultrasound to the liver. An ultrasonic receiver receives an echo signal of the ultrasound. An ultrasound echo luminance level value obtaining module obtains the luminance level value of a far-field region of the liver and obtains the luminance level value of a near-field region of the liver. An ultrasound attenuation coefficient obtaining module obtains the echo attenuation coefficient of the liver. An ultrasound attenuation coefficient compensation module obtains a modified ultrasound attenuation coefficient by setting up standard liver die bodies with different thicknesses and through ultrasound attenuation coefficient compensation. A liver fat detection module sets up the corresponding relation between the liver fat content and the ultrasound echo signal through measurement, and obtains the liver fat content according to the ultrasound attenuation coefficient obtained through compensation. According to the technical scheme, the image luminance level values are obtained through the ultrasound echo signal of the liver, the echo attenuation coefficient of the liver is more accurately calculated, the ultrasound attenuation coefficient is compensated for by setting up the standard liver die bodies, the corresponding relation between the liver fat content and the ultrasound echo signal is set up, and the liver fat content is obtained according to the ultrasound attenuation coefficient obtained through compensation. According to the technical scheme, the liver fat detection system is convenient and easy to use, practical, accurate and reliable.

Method and apparatus for application of echolocation to robot guidance and assisting the blind. The method is based on the echolocation of bats. It combines a source of pulsed ultrasound (100) with a recently-developed acoustic vector probe (AVP) (200) into an echolocation instrument (1000), together with a data-acquisition system (300), a digital signal processor (400) and an output device (500). The source emits pulses of ultrasound of about 35 kHz over a beam angle of approximately 100 degrees and the AVP detects backscattered pulses from a discrete distribution of acoustic highlights on surrounding objects. The ultrasonic sound pressures of the backscattered pulses are heterodyned down to lower frequencies so that the signal processor can make an accurate determination of the sound-intensity vector for each pulse. The sound-intensity vector points in the direction of the highlight from which the backscattered pulse originates while the round-trip time of flight of the pulse determines the distance to the highlight. In this way the positions of the highlights on surrounding objects can be determined. The distribution of such highlights changes when the echolocation instrument moves relative to surrounding objects, generating a sequence of highlight distributions that can be stored in the memory of the processor and combined to provide a more complete representation of surrounding objects.

A system and method of performing ultrasound modulated optical tomography. Ultrasound is delivered into a target voxel in an anatomical structure, and sample light is delivered into the anatomical structure, whereby a portion of the sample light passing through the target voxel is scattered by the biological tissue as signal light, and a portion of the sample light not passing through the target voxel is scattered by the anatomical structure as background light. The ultrasound and sample light are pulsed in synchrony, such that only the signal light is frequency shifted by the ultrasound. Reference light is combined with the signal light and background light to generate an interference light pattern, which is sequentially modulated to generate a plurality of different interference light patterns. Spatial components of each of the different interference light patterns are simultaneously detected and stored in bins.

The invention discloses an aluminum alloy pulse ultrasound and electric arc composite welding device and method. Based on ultrasound and electric arc composite welding, the device further comprises a current and voltage detection circuit, a DSP, a single chip microcomputer, a triode switch circuit and a drive circuit. The current and voltage detection circuit is connected with the output end of a matching circuit of an ultrasound generation system. The current and voltage detection circuit is connected with the DSP. The DSP is connected with the drive circuit. The single chip microcomputer is connected with the triode switch circuit. The triode switch circuit is connected with the drive circuit. The drive circuit is connected with a DC / AC full-bridge inversion circuit of the ultrasound generation system. According to the welding method, ultrasound is applied to conduct pulsing processing, and aluminum alloy pulse ultrasound and electric arc composite welding is achieved. The aluminum alloy pulse ultrasound and electric arc composite welding device and method have the advantages of ordinary ultrasound and electric arc composite welding, the electric arc stiffness can be improved, weld penetration is increased, grains are refined, the size of molten drops is reduced, transition frequency is increased, splashing is reduced, high-quality welding under a common welding environment is achieved, aluminum alloy welding pores, welding cracks and the like can be reduced effectively, the microstructure of weld metal is optimized, and the mechanical property of welding connectors is improved remarkably.

The invention discloses pulse ultrasound treatment equipment for male erectile dysfunction.The pulse ultrasound treatment equipment comprises a master control device, a micro-control system and a treatment probe.The treatment probe comprises an ultrasound generator.The master control device sends control signals to the micro-control system, the micro-control system converts the control signals into control instructions and sends the control instructions to the ultrasound generator, and the ultrasound generator generates corresponding ultrasound according to the control instructions.The pulse ultrasound treatment equipment can generate the ultrasound for therapeutic use, treatment is conducted in vitro in a non-intrusive mode, pain brought to a patient by an operation is avoided, and harm of medicine to the human body of dependence of the human body on the medicine are avoided.The low-intensity pulse ultrasound can promote neovascularization, proliferation of cavernous body smooth muscle cells and eNOS and nNOS expression, improve blood flow of the penis, lower a TGF-beta1 / Smad / CTGF signal channel and relieve fibrosis of the penis, the pathological change of the erection organ is improved accordingly, and finally the erection function of the penis is improved.

The invention discloses a digital pulsed ultrasound transmitting device for a fetal monitor, relating to the field of medical equipment. The digital pulsed ultrasound transmitting device comprises an ultrasound probe and an ultrasound transmitting circuit which are connected with each other, wherein the ultrasound probe employs a plurality of wafers which integrates transmission and reception functions into a whole and has the transmitting frequency of 1.0 MHz, the wafers are arranged on the radiation surface of the probe uniformly. The digital pulsed ultrasound transmitting device has wide ultrasound transmission acoustic beams, and is hardly affected by fetal movement and uterine contraction during detection upon a fetal heart signal in a monitoring process, so that the monitoring result is more accurate and reliable; the transmitting circuit generates a transmission electric excitation square wave signal of 1.0 MHz by using a CPLD (Complex Programmable Logic Device) digital circuit, the transmission electric excitation square wave signal is coupled to the ultrasonic probe by a resonant amplification circuit so as to generate an ultrasonic wave of 1.0 MHz; and the digital pulsed ultrasound transmitting device is low in transmission frequency, less in attenuation in an ultrasound propagation process, strong in reflection echo, high in flexibility, low in noise, strong in anti-interference ability, and steady and reliable in performance.

The invention provides an ultrasonic-based liver fat quantification method and system. According to recommendations, the system comprises an ultrasonic transmitter, an ultrasonic receiver, an ultrasonic signal processing module, a liver near-field positioning module, a liver far-field positioning module and an ultrasonic attenuation coefficient calculating module; the ultrasonic transmitter is used for transmitting pulse ultrasonic to liver tissues; the ultrasonic receiver is used for receiving ultrasonic echo signals of the liver tissues; the ultrasonic signal processing module is used for compensating, sampling, demodulating, envelope detecting or filtering of the ultrasonic echo signals of the liver tissues, so as to obtain processed ultrasonic echo corrected signals; the liver near-field positioning module is used for positioning a near-field region RN of a liver; the liver far-field positioning module is used for positioning a far-region of the liver; the ultrasonic attenuation coefficient calculating module is used for calculating an ultrasonic attenuation coefficient Epsilon of the liver.

A mesofluidic reactor performs a chemical reaction of a starting material. A liquid phase starting material is introduced into a spraying head equipped with an ultrasound generating piezoelectric crystal unit. An inert / reagent gas feeds into the spraying head, connected to a reactor tube arranged within a thermally insulated multi-zone heating unit. For solid phase, an inert / reagent gas is introduced into a solids container connected to a spraying head equipped with an ultrasound generating piezoelectric crystal unit. The spraying head connects to a reactor tube arranged within a thermally insulated multi-zone heating unit. In either case, a reactor tube outlet connects to a cooled product trap to collect conversed substances. The spraying head generates a particle size distribution with nano and micro sized particles for the liquid phase and nano, micro or larger particles for the solid phase. The inert / reagent gas is preheated over the piezoelectric crystal unit's surface.