38 results about "Bioelectrical impedance analysis" patented technology

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.

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.

The present invention provides a 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 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.

A pet body fat measuring tool and method for measuring pet body fat by measuring a bioelectrical impedance includes an electrode body including at least two current electrodes and at least two voltage electrodes. The electrode body is pressed to a part of a pet body. The tool also includes a control calculating unit having an impedance measuring circuit connected to the electrode body to control a current made to flow at a time of measurement. The control calculating unit includes, in advance of the measurement, a direct correlation between a body fat percentage of a pet body and the bioelectrical impedance of the pet body to calculate the body fat percentage based on only a bioelectrical impedance determined from measured voltages. A distance between each of the current electrodes and each of the voltage electrode is fixed.

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.

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.