CN203953659U - A kind of complex impedance circuit board for bio-impedance spectrum systems - Google Patents

Abstract

This utility model relates to the signal pickup assembly in bio-impedance checkout equipment, specifically discloses a kind of complex impedance circuit board for bio-impedance spectrum systems.This complex impedance circuit board comprises substrate and is arranged at the uniform impedance model on substrate, described uniform impedance model is formed by connecting by identical multiple complex impedance network types, described complex impedance network type is connected to junction point between described complex impedance and at least comprises five and be uniformly distributed in same base plan, wherein a junction point is positioned at substrate center, and other junction points are arranged taking four points of connection as unit and with the circumference that the junction point that is positioned at place of substrate center is centrosymmetric respectively.Therefore design complex impedance circuit board by the mode that adopts uniform impedance model, there is accurate analysis and distinguish loose contact or measure inaccurate problem solving actual biological tissue's measurement, thereby simplify the operation environment and be convenient to, according to this complex impedance circuit board, configuration of electrodes, electrode spacing are carried out to simulation modeling and checking.

Description

A kind of complex impedance circuit board for bio-impedance spectrum systems

Technical field

This utility model relates to the signal pickup assembly in bio-impedance checkout equipment, is specifically related to a kind of complex impedance circuit board for bio-impedance spectrum systems.

Background technology

Bio-impedance frequency spectrum (Bioelectrical impedance spectroscopy is called for short " BIS ") is a kind of biological tissue detection technique changing along with injecting the frequency change of pumping signal that is changed to objective body electrical impedance.This technology is harmless to human body noinvasive, and system structure is simple, measures easyly, and inspection party's mask of cancerous tissue is had wide practical use.Existing BIS system normally applies small alternating current (voltage signal) by the exciting electrode being placed in biological tissue to measurand, the voltage (current signal) that simultaneously detects tissue surface by acquisition electrode calculates corresponding electrical impedance and variation thereof by signal collected, obtains relevant physiology and pathological information.

But in BIS measuring process, exist contact impedance, and the difference of signal output under different frequent points, the output impedance of current source is with the impact of load impedance, the impact (configuration of electrodes) that different excitation collection models is measured us.The object of this model is idealized operating environment, is convenient to analyze and solve problem for running into the problems referred to above in measuring process.Therefore, general by actual biological tissue is measured in the prior art, but be not easy to analyze while running into the problems such as loose contact, the current source output impedance measurement causing such as too low is inaccurate.Given this, the utility model proposes a kind of BIS system complex impedance circuit board based on uniform impedance model.

Utility model content

The deficiency existing for above-mentioned prior art, the purpose of this utility model is to provide a kind ofly to be distinguished loose contact or measures the inaccurate BIS system complex impedance circuit board based on uniform impedance model for analyzing, thereby simplifies the operation environment and be convenient to, according to this complex impedance circuit board, configuration of electrodes, electrode spacing are carried out to simulation modeling and checking.

To achieve these goals, the technical scheme that this utility model adopts is as follows:

A kind of complex impedance circuit board for bio-impedance spectrum systems, comprise substrate and be arranged at the uniform impedance model on substrate, described uniform impedance model is formed by connecting by identical multiple complex impedance network types, described complex impedance network type is connected to junction point between described complex impedance and at least comprises five and be uniformly distributed in same base plan, wherein a junction point is positioned at substrate center, and other junction points are arranged taking four points of connection as unit and with the circumference that the junction point that is positioned at place of substrate center is centrosymmetric respectively.

Preferably, the four points of connection of each unit lays respectively at foursquare each summit place.

Between the geometric figure that further, the junction point of each unit connects and composes, be mutually parallel state.

Further, between each unit, adjacent junction point connects and composes isosceles trapezoid, and wherein between a pair of diagonal angle junction point of each isosceles trapezoid, line incline direction is to be provided with a complex impedance between rotating Vortex and two junction points.

Preferably, described four points of connection is the square that A, B, C, D or E, F, G, H or I, L, J, K connect and compose, and the square forming is parallel each other, so that be system verification after four electrode contacts to be measured of equidistant quadrangular array.

Preferably, it is equidistant that described four points of connection is that E, A, C, G or I, A, C, K connect and compose between linear and each junction point, so that system verification after four electrode contacts to be measured of " one " font.

Adopt after technique scheme, the beneficial effect that compared to the prior art this utility model had is: design complex impedance circuit board by the mode that adopts uniform impedance model, there is accurate analysis and distinguish loose contact or measure inaccurate problem solving actual biological tissue's measurement, thereby simplify the operation environment and be convenient to, according to this complex impedance circuit board, configuration of electrodes, electrode spacing are carried out to simulation modeling and checking.

Brief description of the drawings

Below in conjunction with drawings and Examples, this utility model is further illustrated.

Fig. 1 is complex impedance board structure of circuit schematic diagram described in this utility model one embodiment.

Fig. 2 is uniform impedance model circuit diagram described in this utility model one embodiment.

Fig. 3 is biological tissue cell equivalent model circuit diagram described in the utility model.

Reference numeral:

1-complex impedance circuit board, the even Resistance model for prediction of 2-, O-substrate center junction point, Z-complex impedance, A, B, C, D, E, F, G, H, I, G, K-measurement point.

Detailed description of the invention

The following stated is only preferred embodiment of the present utility model, does not therefore limit protection domain of the present utility model.

As depicted in figs. 1 and 2, this utility model provides a kind of complex impedance circuit board for bio-impedance spectrum systems, comprise substrate 1 and be arranged at the uniform impedance model 2 on substrate 1, described uniform impedance model 2 is formed by connecting by identical multiple complex impedance network types, described multiple complex impedance network type is connected to junction point between described complex impedance Z and at least comprises five and be uniformly distributed in same substrate 1 plane, wherein a junction point O is positioned at substrate 1 center, other junction points are respectively with four points of connection (A, B, C, D or E, F, G, H or I, J, K, L) arrange for unit and with the circumference that the junction point O that is positioned at place of substrate center is centrosymmetric.

For ease of the modeling of emulation uniform impedance, in the present embodiment, the four points of connection of each unit lays respectively at foursquare each summit place.And be mutually parallel state between the geometric figure that connects and composes of the junction point of each unit.In addition, between each unit, adjacent junction point connects and composes isosceles trapezoid, and wherein between a pair of diagonal angle junction point of each isosceles trapezoid, line incline direction is between rotating Vortex and two junction points, to be provided with a complex impedance Z.

Wherein, the junction point on substrate 1 is the square that A, B, C, D or E, F, G, H or I, L, J, K connect and compose, and the square forming is parallel each other, so that be system verification after four electrode contacts to be measured of equidistant quadrangular array; And that junction point on substrate 1 is that E, A, C, G or I, A, C, K connect and compose between linear and each junction point is equidistant, so that system verification after four electrode contacts to be measured of " one " font.

In four electrode test models, signal is divided into pumping signal (comprising excitation positive signal and excitation negative signal) and acquired signal (comprise and gather positive signal and gather negative signal).In the time that configuration of electrodes is equidistant tetragonal four electrode model, under this BIS system test, energisation mode is to encourage between two adjacent electrodes, other two electrodes are signals collecting, such as: measurement point A adds excitation positive signal, measurement point B adds excitation negative signal, measurement point D receives and gathers positive signal, and measurement point C receives and gathers negative signal; In the time when configuration of electrodes being four electrode model of equidistantly " one " font, the energisation mode of this BIS system is that both sides electrode adds exciting electrode, middle two electrodes are as acquisition electrode, such as: measurement point E adds excitation positive signal, measurement point A receives and gathers positive signal, measurement point C receives and gathers negative signal, and measurement point G adds excitation negative signal.

Continue biological tissue's equivalent model circuit diagram as shown in Figure 3, described in this utility model embodiment, the computing formula of complex impedance Z is: Z=Z'+jZ " (Z' is real part, Z " be imaginary part).

The computing formula of real part Z' is as follows:

$Z^{\′}=\frac{(2\mathrm{RmRe}+\mathrm{RiRe})(2\mathrm{Rm}+\mathrm{Ri}+\mathrm{Re})+{\left(\mathrm{\ωCmRm}\right)}^2\left(\mathrm{RiRe}\right)(\mathrm{Ri}+\mathrm{Re})}{{(2\mathrm{Rm}+\mathrm{Ri}+\mathrm{Re})}^2+{\left[\mathrm{\ωCmRm}(\mathrm{Ri}+\mathrm{Re})\right]}^2};$

Imaginary part Z " computing formula as follows:

$Z^{\′\′}=-\frac{2{\left(\mathrm{RmRe}\right)}^2}{{(2\mathrm{Rm}+\mathrm{Ri}+\mathrm{Re})}^2+{\left[\mathrm{\ωCmRm}(\mathrm{Ri}+\mathrm{Re})\right]}^2}.$

Wherein, Re is resistanceper unit length of external fluid, and Rm is cell membrane resistance, Cm cell membrane shunt capacitance, and Ri intracellular fluid resistance, ω is angular frequency, ω=2 π f (f is the frequency of signal).As shown from the above formula, in the time getting the electric capacity of different value and resistance, represent different biological tissues.

Described complex impedance circuit board has been avoided connecting and not needing to arrange switch on and off between complex impedance in the present embodiment, only acquisition electrode in BIS system need to be connected with the measurement point on complex impedance circuit board, just can carry out contrast verification to BIS system and artificial circuit easily.

Foregoing is only preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.

Claims (6)

1. the complex impedance circuit board for bio-impedance spectrum systems, comprise substrate and be arranged at the even Resistance model for prediction on substrate, described even Resistance model for prediction is formed by connecting by identical multiple impedance network formulas that hinder again, described complex impedance network type is connected to junction point between described complex impedance and at least comprises five and be uniformly distributed in same base plan, wherein a junction point is positioned at substrate center, and other junction points are arranged taking four points of connection as unit and with the circumference that the junction point that is positioned at place of substrate center is centrosymmetric respectively.

2. complex impedance circuit board according to claim 1, is characterized in that, the four points of connection of each unit lays respectively at foursquare each summit place.

3. complex impedance circuit board according to claim 1 and 2, is characterized in that, is mutually parallel state between the geometric figure that the junction point of each unit connects and composes.

4. complex impedance circuit board according to claim 1 and 2, it is characterized in that, between each unit, adjacent junction point connects and composes isosceles trapezoid, and wherein between a pair of diagonal angle junction point of each isosceles trapezoid, line incline direction is to be provided with a complex impedance between rotating Vortex and two junction points.

5. complex impedance circuit board according to claim 1, it is characterized in that, described four points of connection is the square that A, B, C, D or E, F, G, H or I, L, J, K connect and compose, and the square forming is parallel each other, so that be system verification after four electrode contacts to be measured of equidistant quadrangular array.

6. complex impedance circuit board according to claim 1, is characterized in that, it is equidistant that described four points of connection is that E, A, C, G or I, A, C, K connect and compose between linear and each junction point, so that system verification after four electrode contacts to be measured of " one " font.