Annular arrangement type multi-needle biological tissue dielectric spectrum characteristic measuring probe and method

Abstract

The invention discloses an annular arrangement type multi-needle biological tissue dielectric spectrum characteristic measuring probe, which comprises a base, wherein a plurality of needle type electrodes, a change-over switch and an excitation end and measuring end interface are arranged on the base; the plurality of needle type electrodes are arranged on two concentric circles of an inner ring and an outer ring formed on the base at equal interval and is perpendicular to the base to serve as excitation electrodes and measuring electrodes; and the electrodes of the same function are internally connected through copper wires on the base and are connected with the excitation end and measuring end interface through the change-over switch. The probe also comprises a calibration box which is matched with the probe for use. The invention also discloses an implementation method for biological tissue dielectric characteristic measurement by using the probe. The problem of strict requirement on shapes of tissues to be measured by the conventional measuring device is effectively solved, so that the electrical impedance measurement on the tissues of irregular shapes or the tissues difficult to cut is made possible.

Description

technical field [0001] The present invention relates to the field of measuring the dielectric properties of biological tissue, in particular to a ring-arranged multi-needle probe and method for measuring the dielectric spectrum properties of biological tissue, especially suitable for the measurement of small-volume soft tissues with irregular shapes in vitro, and has the advantages of High measurement accuracy. Background technique [0002] The dielectric properties of biological tissue are the passive electrical properties of biological substances, a physical expression of the electrical response characteristics of biological substances to electromagnetic fields, and the basis of the response characteristics of tissues to external electromagnetic fields. The dielectric properties of biological tissue are usually characterized by the dielectric spectrum in which the conductivity σ and the permittivity ε vary with frequency. The permittivity ε is a measure of a biological su...

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Problems solved by technology

[0005] Although the four-electrode method can effectively suppress the influence of the electrode / skin contact impedance in the low frequency band, as the measurement frequency increases, especially when the measurement frequency exceeds 1MHz, the four-electrode method will suffer due to the distribution parameters and space between electrodes and wires. The influence of the medium can not meet the measurement requirements

But its disadvantages are: 1) the electric field is too divergent, requiring a relatively large volume of the tissue to be measured; 2) it cannot support the two-electrode electrical impedance measurement in the high frequency band, so it cannot be used for the dielectric property measurement in the high frequency band

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