38 results about "Bioelectrical impedance analysis" patented technology

Apparatus and methods are provided for monitoring cardiac output using bioelectrical impedance techniques in which first and second electrodes are placed in the trachea and / or bronchus in the vicinity of the ascending aorta, while an excitation current is injected into the thorax via first and second current electrodes, so that bioelectrical impedance measurements based on the voltage drop sensed by the first and second electrodes reflect voltage changes induced primarily by blood flow dynamics, rather than respiratory or non-cardiac related physiological effects. Additional sense electrodes may be provided, either internally, or externally, for which bioelectrical impedance values may be obtained. Methods are provided for computing cardiac output from bioelectrical impedance values. Apparatus and methods are also provided so that the measured cardiac output may be used to control administration of intravenous fluids to an organism or to optimize a heart rate controlled by a pacemaker.

New systems and methods for remotely monitoring the activity, security, and health of an individual are provided. The monitoring system can be used to monitor both residence security and typical residential activity that is linked to the well being and health of an individual and can alert a third party when there is a digression from a predetermined set parameters. The monitoring system can incorporate a number of sensing elements including door opening and closing detection elements, passive infrared sensors, energy sensors for detecting the turning on and off of general household appliances, weighing scales, systolic blood pressure or pulse pressure measurement apparatus, bioelectrical impedance analysis measurement apparatus, breath analysis, and blood-based biological marker detection and quantification.

Disclosed is an improved bioelectrical impedance gauge which is so designed that the high-frequency current flowing between two selected points in a living body may be detected in the vicinity of either selected point, and that the voltage appearing between two points selected in the current passage in which the high-frequency current flows may be applied to a high-impedance buffer circuit proximate to the two points selected in the current passage.

Disclosed is an improved bioelectrical impedance gauge which is so designed that the high-frequency current flowing between two selected points in a living body may be detected in the vicinity of either selected point, and that the voltage appearing between two points selected in the current passage in which the high-frequency current flows may be applied to a high-impedance buffer circuit proximate to the two points selected in the current passage.

Disclosed is a impedance measuring apparatus which is easy to use, and which is guaranteed to be free of incorrect measurement caused by some joints appearing in the current flowing passage intervening between two selected body parts and by the indefinite length between two selected body parts. The measuring apparatus of the present invention limits the place of the body under measurement to "one body region", i.e. a selected joint-to-joint body portion or joint-free body portion such as the forearm extending from the wrist to the elbow or the portion extending from the ankle to the knee, and comprises a housing having a contact surface to be applied to one selected body region; a first pair of measurement current supplying electrodes so placed on the contact surface that the one selected body region may be put in contact with the current electrodes; and a first pair of voltage measuring electrodes so placed on the contact surface between the pair of current electrodes that the one selected body region may be put in contact with the voltage electrodes.

A method and system to determine palatability (tenderness, juiciness, and flavor) of Eve foodstuffs (meat, fish, fowl, ft and vegetables) including the steps of, utilizing bioelectrical impedance analysis in a biological subject model for measurement and composition analysis; and a system of using the results of the utilizing step procedure to illustrate an objective scale of palatability; a ‘Palatability Index’.

A process of determining if a foodstuff is fresh or has previously been frozen. The foodstuff is subjected to bioelectrical impedance analysis including measurement or calculation of values of resistance, reactance, impedance, capacitance, and / or phase angle. The results illustrate whether or not the foodstuff has been previously frozen or is fresh. Also provided is a process of selecting a preparation method, a packaging and shipping method, or disposition of a foodstuff. First determining a palatability value for the foodstuff. Second determining as a function of the determined palatability value whether or not the foodstuff is to be prepared for consumption, is to be packaged and shipped, or is to be disposed of.

The present invention provides bioelectrical impedance measuring apparatus for determining composition data of a human body, the apparatus including a plurality of electrodes and measuring circuitry which inject, through two electrodes, alternating current into the body, and which determine, with two other electrodes on different limbs, the resulting voltages, and which determine therefrom the impedance of body segments. In one apparatus, two hand contact bodies are disclosed, each of which is shaped in such a manner and provided with two electrodes in such a manner that a user when contacting the hand contact bodies with his hands comes into contact with two electrodes for each hand at the respective hand contact body. Each hand contact body includes a hand seating surface for placement of a hand inner surface thereon, each hand seating surface includes an electrically insulating separating wall extending over a part of the length of the hand seating surface, the separating wall being adapted to project into the space between middle and ring finger when a hand is placed on the hand seating surface, and on both sides of the separating wall an electrode is included such that, when a hand is placed on the hand seating surface, one electrode comes into contact with the small finger and / or ring finger at the other electrode comes into contact with middle finger and / or index finger.

Electrodes for a bio-impedance measuring device or a body composition monitor, the electrodes being integral with or being attached to a surface of at least one device belonging to a group of electronic and / or non-electronic devices used in the preparation of a dialysis treatment or during dialysis, in particular during peritoneal dialysis, the group preferably consisting of organizers of a continuous ambulatory peritoneal dialysis system (CAPD), automated peritoneal dialysis devices, automated peritoneal dialysis-cyclers (APD-Cycler), bioelectrical impedance analyzers (BIA), body composition monitors (BCM), hand-held electrodes holders for the electrodes, and dialysis apparatuses. Devices and methods used during dialysis are also described.

The invention discloses an electrode contact state detecting method for electrical impedance detection based on measurement precision, and belongs to the technology and application field of bioelectrical impedance imaging. The method comprises the steps that original transmission impedance data collected by an imaging system within a period of time is utilized for acquiring the relative measurement precision of all measurement channels through statistic analysis; the related average measurement precision of all measuring and exciting electrode pairs is acquired through further operational analysis, and the contact state of an electrode and skin is detected according to the range of the average measurement precision. The method can be used for detecting the electrode contact quality fast and accurately in real time, therefore, it is possible for operators to fast eliminate electrode connecting anomaly in time, and reference bases are provided for evaluation of continuous electrical impedance data collecting quality.

A method and an apparatus are described for testing the health status, gender, and body composition of living fish as well as time of death for dead fish. The apparatus consists of two series of needles that are mounted to a measuring device that is capable of simultaneously measuring the distance between the two sets of needles and the impedance of a whole fish. The method includes applying needles to the fish, passing an electrical current between the needles, determining impedance for tissue of the fish between the needles, measuring the distance between the two needles and correlating the determined impedance and needle distance measurement with the health status, gender and body composition of living fish and dead fish and time of death of dead fish.

An apparatus includes an analysis circuit and a controller. The analysis circuit may be configured to automatically make a plurality of segmental bioelectrical resistance and reactance measurements using permutations of a plurality of electrodes selected four at a time. The plurality of electrodes are configured to be attached to predetermined locations on a body of a subject. The controller may be configured to (i) calculate a plurality of segmental body composition values using the plurality of segmental bioelectrical resistance and reactance measurements, a number of predetermined coefficients, and a number of predictive equations, and (ii) generate a report presenting the plurality of segmental body composition values and a total body composition value. The number of predetermined coefficients are stored in a lookup table. Each of the segmental body composition values when added sum to a value essentially equal to respective whole body composition values.

The invention discloses a sleeping posture identification method based on bioelectrical impedance. The method comprises the following steps of: acquiring electrical impedance signals of the left and right chests of a testee; performing analog-to-digital conversion on the electrical impedance signals of the left and right chests respectively to obtain digital electrical impedance signals of the left and right chests; extracting reference feature values according to the digital electrical impedance signals of the left and right chests; identifying the sleeping postures of the testee by adopting a hierarchical support vector machine classification method according to the reference feature values. The method is simple and easy, has a good anti-interference effect and can be used for quickly and accurately identifying the five main sleeping postures of the testee.

A method for determining the freshness of fish. The method includes applying electrodes to the fish, passing an electrical current between the electrodes, determining an impedance for tissue of the fish between the electrodes, and correlating the determined impedance with a freshness value to determine the freshness of the fish.

The invention relates to a data acquiring device for bioelectrical impedance imaging. The data acquiring device comprises a control unit, wherein the control unit is in parallel connection with a signal generator; the signal generator is connected with a voltage-controlled current source circuit; the voltage-controlled current source circuit is connected with a multi-way switch; the multi-way switch is connected with an electrode array and a signal conditioning module; voltage is transmitted into a DSP module through the signal conditioning module; the DSP module comprises an analog to digital converter and a digital demodulator; the DSP module is connected with a host computer; the control unit is used for transmitting data to the DSP module; an excitation current is injected to the electrode array by the voltage-controlled current source through the multi-way switch; the multi-way switch is used for acquiring the voltage on the electrode array; the voltage is transmitted to the DSP module through the signal conditioning module; the DSP module is used for performing modulus transformation on a voltage signal and then performing digital demodulation; and the data is transmitted to the host machine for image reconstruction. According to the data acquiring device disclosed by the invention, the data processing speed is accelerated, the speed and the precision of bioelectrical impedance data acquisition can be effectively increased, and the image reconstruction quality is guaranteed.

A body composition measuring apparatus using a bioelectric impedance analysis and a neural network algorithm for obtaining two or more anthropometry variables from testees and then inputting the anthropometry variables into the internal processing unit that has a built-in back propagation-artificial neural network that has one input layer, 1-10 hidden layers each having 1-15 hidden neurons and one output layer having one output neuron. By means of the aforesaid artificial neural network, the invention accurately predict the fat free mass of the testee so as to further obtain the amount of body fat, showing higher accuracy than conventional linear regression equation (LRE).

A method of determining and monitoring the safety of a foodstuff by subjecting the foodstuff to bioelectrical impedance analysis including measurement and calculation of values of resistance, reactance, impedance, capacitance, and phase angle of the foodstuff, and then tracking the values over time to illustrate freshness, palatability and safety of the foodstuff, and ascertaining difference in rate of change from established averages of freshness and palatability to show possible contamination of the foodstuff.

A system for assessing muscle function of a patient is provided. The system includes: a dual-energy X-ray absorptiometry device operative to scan the patient so as to generate a lean mass measurement; a bioelectrical impedance analysis device operative to scan the patient so as to generate an extracellular water volume measurement; and a controller that includes at least one processor and a memory device, the controller in electrical communication with the dual-energy X-ray absorptiometry device and the bioelectrical impedance device. The controller is adapted to: receive the lean mass measurement and the extracellular water volume measurement; store the lean mass measurement and the extracellular water volume measurement in the memory device; and generate a muscle assessment indicator of the patient based at least in part on the lean mass measurement and the extracellular water volume measurement stored in the memory device.

Methods and systems are provided for the noninvasive measurement of the subepithelial impedance of the breast and for assessing the risk that a substantially asymptomatic female patient will develop or be at substantially increased risk of developing proliferative or pre-cancerous changes in the breast, or may be at subsequent risk for the development of pre-cancerous or cancerous changes. A plurality of electrodes are used to measure subepithelial impedance of parenchymal breast tissue of a patient at one or more locations and at least one frequency, particularly moderately high frequencies. The risk of developing breast cancer is assessed according to measured and expected or estimated values of subepithelial impedance for the patient and according to one or more experienced-based algorithms. Devices for practicing the disclosed methods are also provided.

The invention discloses a noninvasive blood glucose detection method and device based on a bioelectrical impedance analysis method, and belongs to the field of electronic information and the biological medical electronic field. The method is characterized in that a traditional blood glucose detection method based on skin blood sampling is changed into the noninvasive blood glucose detection method, and the noninvasive blood glucose detection method comprises the steps that alternating-current currents with the constant size are excited to the human skin through two high-impedance electrodes, the size of the alternating-current voltage between two high-impedance electrodes arranged between the two former electrodes is collected, then the bioelectrical impedance Z between the latter two electrodes can be measured, multiple bioelectrical impedances Z under the different frequencies are obtained through multiple times of measurement through the method of changing the bioelectric frequency, and then blood glucose content data in the human blood is obtained after other interference factors are excluded.

The invention discloses an XP embedded physiotherapy instrument system based on a bioelectrical impedance mechanism. The XP embedded physiotherapy instrument system based on the bioelectrical impedance mechanism comprises an XP system man-machine interaction module, a digital signal processing unit module, a treatment system module and a feedback system module, wherein the treatment system module and the feedback system module are respectively in data exchange connection with the XP system man-machine interaction module through the digital signal processing unit module, and the treatment system module and the feedback system module are respectively connected to the human body lesion tissue. Through adopting the mode, the optimum treatment waveform frequency combination mode matching can be reached according to the change of different parameters of modules in the treatment process, in addition, the process can be intuitively displayed, a clinic treatment patient database is built so that patients, doctors and science researchers can know the illness conditions, the treatment process and the treatment result, and a prescription library can be completed.

A body impedance analysis, BIA, system comprising a host and an accessory device connectable to the host device via a data cable. A first and a second electrode are arranged on an outside of the accessory device and a third and a fourth electrode are arranged on an outside of the host device. A BIA circuitry is connected to the third and the fourth electrode and connectable to the first and the second electrode via the data cable. The BIA circuitry is configured to drive an alternating current through the body via the first and the third electrode, to sense a voltage indicative of a body impedance via the second and the fourth electrode and to determine the body impedance depending on the sensed voltage.

The invention discloses a body composition, mental stress and arteriosclerosis synchronous detection device which comprises a bioelectrical impedance measuring component, a pulse oximeter signal measuring component, a body weight measuring module, a height measuring module, a signal processing unit and a main control unit. The signal processing unit applies sinusoidal current to human limbs through current electrodes and acquires bioelectrical impedance signals, pulse oximeter signals and body weight and height signals obtained by synchronous measurement of the bioelectrical impedance measuring component, the pulse oximeter signal measuring component, the body weight measuring module and the height measuring module, processes the signals and transmits the processed signals to the main control unit; the main control unit receives the corresponding signals processed by the signal processing unit and analyzes the signals to obtain body compositions, mental stress quantization values, arteriosclerosis degree and height and body weight values. The physical health state, the mental health state and the vascular health state of a testee can be rapidly, simply and conveniently acquired byone-step measurement.

Disclosed is an bioelectrical impedance measuring apparatus which is simplified in structure and which is easy to use. A measuring apparatus comprising a personal data input unit which is used in inputting personal data and a plurality of electrodes which are used in measuring bioelectrical impedance is improved according to the present invention in that it comprises: a memory in which the personal data are stored via said personal data input unit; and a control device which carries out a required control by using at least one selected electrode to store the personal data in said memory or to retrieve the personal data from said memory.

The invention provides a heart rate measuring method and a heart rate measuring device based on the bioelectrical impedance technology. According to the heart rate measuring method, the bioelectrical impedance technology is adopted, specifically, an electrical impedance signal of the radial artery of the arm of a tested person is collected, then analog-digital conversion is carried out on the signal, thus an electrical impedance digital signal is obtained, and then the heart rate and heart rate variability characters are extracted from the electrical impedance digital signal. The heart rate measuring method has the characteristics of being simple and feasible, and being low in price and easy and convenient to operate, the heart rate data can be rapidly and accurately collected and analyzed, and the measurement for the tested person is realized.

The invention provides a bioelectricity impedance imaging system hardware circuit system based on a CAN bus. The hardware circuit comprises a middle control plate and a plurality of data collecting plates. The middle control plate is connected to a computer through a serial port connecting cable and receives an instruction sent by the computer. The middle control plate is connected with the data collecting plates through the CAN bus and a shield cable, and a unified programmable clock signal output by the middle control plate is input to the data collecting plates. The DSP of the data collecting plates acquires data through external interruption to carry out digital phase-sensitive demodulation, and the demodulation result is sent to the middle control plate through the CAN bus and finally sent to the computer. The bioelectricity impedance imaging system hardware circuit system has the advantages that the sweep frequency range of system drive signals ranges from 10 KHz to 10 MHz, the bioelectricity impedance imaging system hardware circuit system can be used as a flexible signal generator through the field programmability of an FPGA and can also carry out real-time compensation for collected signals of various channels, the effect on effective signals is offset, and the real-time performance and reliability are ensured.