279 results about "Ultrasonic doppler" patented technology

A vascular coupler adapted to be fixed into position upon a blood vessel and there retain and position a matable sensing device. In a preferred embodiment, the vascular coupler is an anastomotic coupler and the sensing device comprises an ultrasonic Doppler probe.

A method and system recognizes an unknown speaker by directing an ultrasonic signal at a face of the unknown speaker. A Doppler signal of the ultrasonic signal is acquired after reflection by the face, and Doppler features are extracted from the reflected Doppler signal. The Doppler features are classified using Doppler models storing the Doppler features and identities of known speakers to recognize and identify the unknown speaker.

The invention relates to a simulated corrosion test device for an abyssal environment, belonging to the field of simulated test devices for the corrosion property of materials in the abyssal environment. The device comprises an autoclave, a refrigeration system, an air pump, a pressurizing system, a sample delivery device, an exhaust pipe, a dissolved oxygen sensor, an ultrasonic Doppler flowmeter, a pressure sensor, a temperature sensor, a salinity sensor, a pH meter, a drain pipe, a stirring motor, stirring blades and a control cabinet. The device has the advantages that the conditions of temperature, pressure intensity, seawater flow velocity, pH value, salinity and dissolved oxygen concentration of the abyssal environment can be simulated, the automation of control on environment conditions can be realized during a corrosion test, and a convenient indoor simulated test device for testing the corrosion property of the materials in the abyssal environment is provided.

A “relaxoscope” (100) detects the degree of arterial endothelial function. Impairment of arterial endothelial function is an early event in atherosclerosis and correlates with the major risk factors for cardiovascular disease. An artery (115), such as the brachial artery (BA) is measured for diameter before and after several minutes of either vasoconstriction or vasorelaxafion. The change in arterial diameter is a measure of flow-mediated vasomodification (FMVM). The relaxoscope induces an artificial pulse (128) at a superficial radial artery (115) via a linear actuator (120). An ultrasonic Doppler stethoscope (130) detects this pulse 10-20 cm proximal to the point of pulse induction (125). The delay between pulse application and detection provides the pulse transit time (PTT). By measuring PTT before (160) and after arterial diameter change (170), FMVM may be measured based on the changes in PTT caused by changes in vessel caliber, smooth muscle tone and wall thickness.

A method and system recognizes an unknown gesture by directing an ultrasonic signal at an object making an unknown gestures. A set of Doppler signals are acquired of the ultrasonic signal after reflection by the object. Doppler features are extracted from the reflected Doppler signal, and the Doppler features are classified using a set of Doppler models storing the Doppler features and identities of known gestures to recognize and identify the unknown gesture, wherein there is one Doppler model for each known gesture.

A method and apparatus for obtaining the absolute value of intracranial pressure in a non-invasive manner is described by using an ultrasonic Doppler measuring device which detects the intracranial and extracranial blood flow velocities of the intracranial and extracranial segments of the ophthalmic artery. The eye in which the blood flow is monitored is subjected to an external pressure, sufficient to equalize the intracranial and extracranial angle-independent blood flow factors calculated from the intracranial velocity signal and extracranial velocity signal. The absolute value of the intracranial pressure is identified as that external pressure at which such equalization occurs.

An ultrasonic Doppler probe is provided for use in connection with non-invasive Doppler imaging of fluid flow within the human body. The Doppler probe can be selectively operated at more than one frequency during the course of a Doppler imaging examination thereby enhancing the resolution of the image obtained while also increasing the effective depth of the image. The probe of the present invention employs piezo-electric materials for the formation of acoustic transmitting and receiving transducers that are positioned within the probe to allow the probe to be selectively operated at a number of different frequencies spanning no more than one octave in frequency range.

The invention discloses a fetal heart sound monitoring instrument comprising a piezoelectric thin-film sensor, a control circuit and a display component, wherein the control circuit and the piezoelectric thin-film sensor are electrically connected by a conducting wire. According to the fetal heart sound monitoring instrument, the mechanical vibration of the skin of the abdomen of a pregnant woman, which is caused by the palpitation movement of a fetus in the abdomen of the pregnant woman, is sensed by adopting the piezoelectric thin-film sensor and is also converted into a corresponding charge signal, the treatment of amplification, filtration, analog-to-digital conversion, separation and the like is carried out on the charge signal by the control circuit, and finally, a corresponding monitoring result is obtained by output. The fetal heart sound monitoring instrument disclosed by the invention has the advantages of signal monitoring sensitivity, accuracy and good linearity, easy production and manufacture and the like. The fetal heart sound monitoring instrument has more advantages that the fetal heart sound monitoring instrument disclosed by the invention is convenient to use and does not have any injuring action to a mother and a child, so that the fetal heart sound monitoring instrument can be used as a medical auxiliary instrument which is between a fetal heart stethoscope and an ultrasonic Doppler fetal heart sound detecting instrument and is used for clinical diagnosis and the self checking of the pregnant woman.

An ultrasonic Doppler diagnostic equipment comprising a spectrum measurement unit which measures a Doppler spectrum, a decision unit which determines processing conditions of an average process on the basis of power values of spectral components in the Doppler spectrum, an average process unit which performs the average process of the Doppler spectrum on the basis of the processing conditions determined by the decision unit, and a display unit which displays a Doppler spectral image on the basis of the Doppler spectrum subjected to the average process by the average process unit. According to the configuration, the ultrasonic Doppler diagnostic equipment can improve discontinuities in those spectral components of small power values which are susceptible to interference noise, in the Doppler spectral image, and it can generate image data of high resolution.

There is provided an ultrasonic wave diagnosis instrument. The ultrasonic wave Doppler diagnosis instrument transmits an ultrasonic continuous wave in a range direction and receives a reflective wave of the ultrasonic continuous wave. The ultrasonic wave Doppler diagnosis instrument includes: a modulation unit that subjects the ultrasonic continuous wave to frequency modulation such that a phase is varied in accordance with the distance of the range direction; a demodulation unit that demodulates the reflective wave for each range of the range direction while interlocking with the frequency modulation, and generates a reception signal in the range in a separated state; and a presentation unit that presents information by using a signal of a Doppler component based on the reception signal.

A method and apparatus for continuously measuring the absolute intracranial pressure in a non-invasive manner is described by using an ultrasonic Doppler device which detects the pulsatility indexes of the blood flow inside the eye artery for both intracranial and extracranial eye artery portions. The eye in which the blood flow is monitored is subjected to a small pressure, sufficient to equalize the pulsatility index measurements of the internal and external portions of the eye artery. The pressure at which such equalization occurs is used as a reference for autocalibration of the apparatus so that continuous absolute intracranial pressure measurements may be taken over a particular sampling period.

A Doppler sensitivity measuring unit measures the Doppler sensitivity of Doppler spectrum data obtained by ultrasonic wave transmission/reception with respect to a predetermined region of an object to be examined. A spectrum shape model generating unit generates a spectrum shape model on the basis of a window function used when the above Doppler spectrum data is generated. A threshold setting unit sets a threshold range in which trace waveform data displaces by a predetermined amount in the frequency axis direction on the basis of the spectrum shape model and the Doppler sensitivity, and sets a predetermined number of thresholds at almost equal intervals in the threshold range. A trace data generating unit selects a threshold for the acquisition of desired trace waveform data by generating trace waveform data while sequentially updating the plurality of set thresholds.

The invention discloses an ultrasonic open channel flow rate comprehensive monitoring instrument and a measuring method thereof, belonging to the field of metering. The monitoring instrument comprisesan underwater measuring equipment and an abovewater control equipment which are connected with each other by a cable, wherein the control equipment sends measurement command to the measuring equipment; the measuring equipment is used for detecting the flow rate and the liquid level and transmitting the results to the control equipment; and the control equipment stores and displays the received results. The specific steps of the method are explained in specification. The invention utilizes ultrasonic Doppler principle to measure the flow rate and ultrasonic transit-time method principle to measure the liquid level, and can simultaneously measure the water temperature. The invention can modify the working parameters of the instrument at any time, avoids the occurrence of siltation and blockage fault of sensors, displays the current working state timely, alarms in time when finding the fault, is beneficial to reducing the power consumption, and is applicable to measuring rivers or channels with wider widths; furthermore, an split-type ultrasonic wave sensor and a temperature sensor lead independent debugging to be easier, thus being easy to realize standardized production. The invention can be applied to metering the flow rate of open channels, rivers and the like.

The invention provides an array fetal heart monitoring abdominal bandage based on a piezoelectric film sensor and relates to the field of monitoring on the heart of a fetus. The invention is used for solving the problems of serious error, 'invasion type' monitoring manner and low accuracy caused in the fact that a fetal heart sound stethoscope, an ultrasonic Doppler fetal heart sound instrument and a single sensor are used for fetal heart monitoring in the prior art. Magic pastes are respectively arranged at the two end parts of the abdominal bandage, and a piezoelectric film sensor array is arranged at the middle part of the abdominal bandage; a detection circuit is arranged on the abdominal bandage; and the detection circuit is composed of a preposed differential amplifying circuit, a filter circuit, an analog/digital conversion circuit, a DSP (digital signal processing) module, a storage module and an interface module. The adopted piezoelectric film sensor has the advantages of high response speed, high flexibility and good linearity, and high detection accuracy can be guaranteed; and the piezoelectric film sensor is light, soft and durable, so that the piezoelectric film sensor can be in fit with a human body well after being embedded into the abdominal bandage and a man-machine effect is good.

The invention relates to an ultrasound diagnosis technique, in particular to a method and a device of displaying blood flow images by ultrasonic Doppler information. The invention is characterized in that: firstly, ultrasonic impulses are emitted to an interesting direction or an interesting region according to the predetermined repeated frequency, and echo signals returning from the direction or the region are received; secondly, a series of orthogonal composite Doppler difference frequency signals with the sampling volume are extracted from the echo signals; thirdly, the delayed autocorrelation strength of the orthogonal composite Doppler difference frequency signals is calculated; fourthly, the blood flow images are displayed according to the delayed autocorrelation strength. The blood flow images can also be clearly displayed through the ultrasonic Doppler information under the conditions that the signal-noise ratio is low and the transmission power is not increased.

The invention discloses an underwater multipurpose robot propelled by bionic undulating fins. The underwater multipurpose robot comprises a head, a middle, a tail, a left bionic undulating fin propelling mechanism and a right bionic undulating fin propelling mechanism which are arranged in sequence. The bionic undulating fin propelling mechanisms on the left side and the right side with a cam swing arm driving structure as the core are adopted for driving the fin strips to drive the flexible fin faces to generate continuous undulating deformation, the fin strips act with water to generate advancing thrust, through cooperation with a sinking and floating adjusting mechanism in the middle, multi-dimensional movement such as straight moving, turning and floating and diving of the underwater robot can be achieved, and good maneuverability is achieved. Meanwhile, the sensing flow field speed data and the self orientation data can be obtained according to an ultrasonic Doppler current meterarranged at the head part and a USBL underwater acoustic positioning system; motion of the underwater robot is planned, the underwater robot is selected to operate on a channel with constant flow velocity and small flow resistance, the underwater robot has the capacity of sensing and reducing underwater surge interference in advance, and the underwater robot has good reliability and robustness.

The invention provides a Doppler fetal cardiac sound instantaneous heart rate detecting method based on blind separation. The detection method comprises the following steps that the Doppler fetal cardiac sound is subjected to denoising preprocessing through a low-pass filter; the processed ultrasonic Doppler fetal cardiac sound is subjected to time-frequency analysis, and the short-time Fourier transform is utilized for solving the time-frequency diagram of the ultrasonic Doppler fetal cardiac sound signals; several characteristic frequency bands are selected from the time-frequency diagram according to the priori knowledge of the periodic characteristic of the time-frequency diagram of the fetal cardiac sound signals, then, different selected frequency band signals are subjected to Fast ICA analysis, independent components are worked out, then, the independent component IC which is most matched with the fetal cardiac sound signals is determined, next, a self-correlation function of the most matched independent component IC is calculated, the peak value is detected, and finally, the fetal cardiac sound heart rate is calculated. The Doppler fetal cardiac sound instantaneous heart rate detecting method is used for calculating the instantaneous heart rate on the clinically collected ultrasonic Doppler fetal cardiac sound signals and has the advantages that the method is simple, the calculation speed is high, the flexibility is good, and the accuracy is high.

The invention relates to an ultrasonic-Doppler-effect positioning puncturing device for the vessel. The device comprises an ultrasonic probe, a main control system and a puncturing device. The puncturing device comprises a support, a needle tube, a puncturing needle, a first coder and a second coder. The support is installed on the ultrasonic probe, the front end of the needle tube is installed infront of the support in a rotatable mode, an arc-shaped groove is formed in the rear of the support, and a guide rod is arranged at the rear end of the needle tube and located in the arc-shaped groove. The first coder is installed on the side wall of the needle tube, the second coder is installed on the guide rod, and the ultrasonic probe, the first coder and the second coder are electrically connected with the main control system. Due to the fact that the first coder and the second coder are arranged, through linkage between the needle tube and the ultrasonic probe, needle insertion is guided according to a puncturing range, a puncturing thread, angle information and depth information, the puncturing angle and puncturing depth of the puncturing needle are accurately controlled, it is ensured that a needle head of the puncturing needle accurately reaches the vessel of a focus part, then puncturing work is finished in a one-off mode, and the ultrasonic-Doppler-effect positioning puncturing device is safer and more reliable.

The invention relates to an ultrasonic viewing system, for displaying images of an artery using a curved array of transducer elements, comprising means for acquiring (51) of an ultrasonic image sequence and a Doppler color sequence of a segment of artery explored along its longitudinal axis and having walls moving in relation with the cardiac cycle; and comprising processing means for: estimating the velocity and motion amplitude (53, 54, 55) of the artery walls along Doppler color ultrasound scanning lines; estimating the motion amplitude (58) of the artery walls along lines perpendicular to the artery global axis; and further comprising: display means for displaying (60) curves of this last artery wall amplitude on a dedicated display on which the user may have interaction. The invention further relates to an image processing method having steps to be carried out using this system.