Summary of the invention
In view of this, the technical problem that the present invention will solve is to provide a kind of bioelectrical impedance analysis instrument.
A kind of bioelectrical impedance analysis instrument, comprising: detecting electrode unit, control device and analytical equipment; Described detecting electrode unit is connected with described control device, and described control device is connected with analytical equipment; Described detecting electrode unit and human contact, measure electric current and acquisition testing signal for exporting, wherein, described detecting electrode unit can export the measurement electric current of multiple frequency; Described control device controls the frequency of described measurement electric current and receives described detection signal; Described detection signal is sent to described analytical equipment by described control device, and described analytical equipment is analyzed human body component based on described detection signal.
According to one embodiment of present invention, further, described control device comprises: sinusoidal signal generator module; Described sinusoidal signal generator module produces the sine-shaped measurement electric current be applied on described detecting electrode unit, and wherein, the frequency of described measurement electric current comprises: 1kHz, 5kHz, 50kHz, 250kHz, 500kHz, 1000kHz.
According to one embodiment of present invention, further, the quantity of described detecting electrode unit is 4; Wherein, what 2 described detecting electrode unit were fixed on bioelectrical impedance analysis instrument holds on handle, and 2 described detecting electrode unit are fixed on the pedal of bioelectrical impedance analysis instrument.
According to one embodiment of present invention, further, described detecting electrode unit comprises: the first detecting electrode, described second detecting electrode; Described first detecting electrode and described second detecting electrode all with human contact, described first detecting electrode exports described measurement electric current, and described second detecting electrode gathers described detection signal.
According to one embodiment of present invention, further, electrode drive circuit module; Described detecting electrode unit, described electrode drive circuit are connected successively with described control device.
According to one embodiment of present invention, further, the quantity of described electrode drive circuit module is 4; Described electrode drive circuit module and described detecting electrode unit are that one_to_one corresponding is arranged.
According to one embodiment of present invention, further, described electrode drive circuit module comprises: the first signal isolating transformer, secondary signal isolating transformer; The primary coil of described first signal isolating transformer is connected with described first detecting electrode, and the secondary coil of described first signal isolating transformer is connected with described control device; The primary coil of described secondary signal isolating transformer is connected with described second detecting electrode, and the secondary coil of described secondary signal isolating transformer is connected with described control device.
According to one embodiment of present invention, further, described electrode drive circuit module comprises: the first voltage follower, the second voltage follower; The two ends of described first voltage follower are connected with described first detecting electrode, described control device respectively; The two ends of described second voltage follower are connected with described second detecting electrode, described control device respectively.
According to one embodiment of present invention, further, described electrode drive circuit module comprises: filtration module; Described filtration module is connected with described second detecting electrode, described control device respectively.
According to one embodiment of present invention, further, body weigher; Described body weigher is connected with described control device, and the body weight information of detection is sent to described control device.
According to one embodiment of present invention, further, described body weigher comprises: sensor assembly, power supply circuits module, signal amplifying and conditioning circuit module and analog-to-digital conversion module; Wherein, described sensor assembly, described signal amplifying and conditioning circuit module are connected successively with described analog-to-digital conversion module; Described analog-to-digital conversion module is connected with described control device.
According to one embodiment of present invention, further, described power supply circuits module comprises: operational amplifier, PNP type triode and voltage stabilizing chip; The VREF foot output reference voltage of described voltage stabilizing chip; Described VREF foot is connected with the positive input terminal of described operational amplifier by the first resistance, forms first line; One end ground connection of the second resistance, the other end is connected with the outfan of described operational amplifier, forms the second circuit; One end of first electric capacity connects on the second line are each, the other end to be connected in described first line and its junction point between described second resistance and described outfan; One end ground connection of the second electric capacity, the other end to be connected in described first line and its junction point between the junction point and described second resistance of described first electric capacity; The negative input end of described operational amplifier is connected with the colelctor electrode of described audion by the 4th resistance, forms tertiary circuit; One end ground connection of the 3rd resistance, the other end are connected on described tertiary circuit and it connects node between described 4th resistance and described negative input end; The Input voltage terminal of described operational amplifier is connected with the base stage of described audion, and described Input voltage terminal is connected with the emitter stage of described audion by the 5th resistance; One end of 3rd electric capacity is connected on described 5th resistance and described emitter stage line, other end ground connection; One end of power supply output lead to be connected on described tertiary circuit and its junction point between described 4th resistance and described colelctor electrode; One end of 4th electric capacity is connected on described power supply output lead, other end ground connection.
According to one embodiment of present invention, further, described analytical equipment is based on described detection signal, described body weight information and personal information, calculate human body component parameter according to human body component detection formula and extrapolate human body indicators, described human body indicators comprises: body fat percentage, basal metabolic rate, standard body weight, target weight; Described analytical equipment generates nutrition curve, dietary recommendation according to described human body indicators and individual sports, diet information.
According to one embodiment of present invention, further, comprising: power isolation module; Described control device is connected with power supply respectively by described power isolation module with described analytical equipment.
According to one embodiment of present invention, further, comprising: printer, audio output device and touch display screen; Described printer is connected with described analytical equipment, and described audio output device is connected with described analytical equipment and described control device respectively, and described touch display screen is connected with described analytical equipment and described control device respectively.
According to one embodiment of present invention, further, comprising: memory module and communication module; Described memory module is connected with described analytical equipment; Described communication module is connected with described analytical equipment and described control device respectively, and described communication module comprises: Ethernet unit, 2G/3G radio-cell, GPRS unit, wifi unit
Bioelectrical impedance analysis instrument of the present invention, multifrequency mode is adopted to carry out biological impedance, the outer composition of human body cell and the whole frequencies needed for cellular content measurement can be covered, make measurement result more accurate, and there is the elimination of electrode tip contact impedance, long cable impedance is eliminated, measured body weight accuracy carries high, biological component data more accurately can be obtained, and there is good human-computer interaction interface and abundant communication interface, the mutual of data and management can be convenient for measuring.
Detailed description of the invention
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with each figure and embodiment, many-sided description is carried out to technical scheme of the present invention.
" first ", " second " hereinafter etc. distinguish on describing, not other special implication.
As shown in Figure 1, the invention provides a kind of bioelectrical impedance analysis instrument and comprise: detecting electrode unit 181,182,183,184, control device 12 and analytical equipment 11.The quantity of detecting electrode unit can be one or more.Detecting electrode unit is connected with control device 12, and control device 12 is connected with analytical equipment 11.Detecting electrode unit 181,182,183,184 and human contact, export and measure electric current and acquisition testing signal, detecting electrode unit 181,182,183, the 184 measurement electric currents that can export multiple frequency.The frequency of control device 12 control survey electric current also receives detection signal.Detection signal is sent to analytical equipment 11 by control device 12, and analytical equipment 11 is analyzed human body component based on detection signal.
Control device 12 comprises: sinusoidal signal generator module.Sinusoidal signal generator module produces and is applied to detecting electrode unit 181,182,183, the sine-shaped measurement electric current on 184.The frequency measuring electric current comprises: 1kHz, 5kHz, 50kHz, 250kHz, 500kHz, 1000kHz etc.Control device 12 adopts constant-current source to apply the of short duration AC signal of the controlled about 100-500 μ A of size, for gathering human body impedance to human body.
Bioelectrical impedance analysis instrument in above-described embodiment, adopts multi-frequency measurement circuit, mixes multi-frequency in the measurements, can cover the outer composition of human body cell and the whole frequencies needed for cellular content measurement, make measurement result more accurate.The stability of the result using this bioelectrical impedance analysis instrument to measure, accuracy, repeatability are all far superior to the result of traditional product.
As shown in Figure 2,3, the quantity of detecting electrode unit is 4.What 2 detecting electrode unit were fixedly mounted on bioelectrical impedance analysis instrument holds on handle 21, and 2 detecting electrode unit are fixedly mounted on the pedal 22 of bioelectrical impedance analysis instrument.Detecting electrode unit comprises: the first detecting electrode 23, second detecting electrode 24.First detecting electrode 23 and the second detecting electrode 24 all contact with human body (hands, foot), and the first detecting electrode 23 exports measures electric current, the second detecting electrode 24 acquisition testing signal.
The drive current being applied to load (human body) that first detecting electrode 23 exports, have the advantages that current values is constant, the constant of electric current is beneficial to elimination external disturbance.Second detecting electrode 24, as signals collecting end, is sampled to impedance signal, is collected, and its input impedance is larger, and anti-interference is stronger.
As shown in Figure 4, detecting electrode unit adopts the way of contact of A, B bipolar electrode sheet, and be connected with the limbs of human body, the first detecting electrode 23, second detecting electrode 24 is respectively A, B electrode.Assuming that contact impedance is ZA, ZB, the micro-electric current of excitation constant current being produced safety by A (or B) exports, and carries out sampling input by B (or A).
Foot electrode (with torch pole) is as the common electrode contact place measuring human body impedance, because human body skin has contact resistance, parasitic capacitive reactance, reactance, be equivalent to contact impedance Z, if will not eliminate, this contact impedance Z can be added to when then measuring in the middle of circuit sampling, affect the stability of sampling precision and repetitive measurement.
As shown in Figure 5,6, measure electric current and flow into human body by A point, measuring voltage is gathered by B point, and the resistance value now recorded is the human body impedance of-C point that crosses of virtual A and B.The electrode measurement mode of originally traditional transceiver is changed into A point input current signal, the mode that B point takes out the transmitting terminal of voltage signal, collection terminal is separated, solves because the accuracy of sampled result that causes of the factors such as the contact impedance series connection of A point or B point and repeated bad problem.
C point is real human body impedance measuring point, A (or B) puts the characteristic of constant-current source, the electric current determining input human body can not be subject to ZA impact, because B (or A) point is high impedance sampling input, when superposing relatively little skin contact impedance ZB, can ignore the impact of ZB on sampling input impedance, sampled point is still equivalent to C point, eliminates skin contact impedance.
In the process used, the metal body surface of detecting electrode can because the oxygen in air or the spontaneous formation oxygenatedchemicals of air humidity, and these compounds can improve the contact resistance on surface.At present, the method reducing contact resistance is by covering different conducting mediums substantially.
In bioelectrical impedance analysis instrument of the present invention, electrode drive circuit module is set, the quantity of electrode drive circuit module can be one or more, such as, the quantity of electrode drive circuit module is 4, electrode drive circuit module 171,172,173,174 with detecting electrode unit 181,182,183,184 to arrange for one_to_one corresponding and to connect.Electrode drive circuit module is connected with control device 12, and electrode drive circuit module has several functions, such as, and isolation, voltage stabilizing, filtering etc.
Electrode drive circuit module comprises: the first signal isolating transformer, secondary signal isolating transformer.The primary coil of the first signal isolating transformer is connected with the first detecting electrode, and the secondary coil of the first signal isolating transformer is connected with control device.The primary coil of secondary signal isolating transformer is connected with the second detecting electrode, and the secondary coil of secondary signal isolating transformer is connected with control device.
Isolating transformer is adopted effectively to isolate the first detecting electrode 23 output measurement electric current and the second detecting electrode 24 acquisition testing signal, to be conducive to promoting human-body safety coefficient, the stability that enhancing signal gathers, surprisingly be applied to human body applying portion when back end signal can be avoided to lose efficacy, reduce the risk of the back end signal of Human Tolerance.
In one embodiment, electrode drive circuit module comprises: the first voltage follower, the second voltage follower.The two ends of the first voltage follower are connected with the first detecting electrode, control device 12 respectively.The two ends of the second voltage follower are connected with the second detecting electrode, control device 12 respectively.
Adopt voltage follower, make output signal be equivalent to a constant pressure source, be not subject to the impact of circuit below, the isolation of front stage circuit is got up, makes it be independent of each other.Electrode drive circuit module also comprises: filtration module.Filtration module is connected with the second detecting electrode 24, control device respectively, and filtration module can carry out Filtering Processing to the detection signal that the second detecting electrode 24 gathers, and improves the accuracy detected.
There is own impedance in transmission cable, simultaneously for the impedance difference that different frequency embodies, and, in traditional product, human limb is directly connected with impedance signal Acquisition Circuit by long cable, superposes the impedance into long cable itself, in addition, weak signal in long cable is easy to be subject to the interference of external interference source, causes sampled data misalignment.
Bioelectrical impedance analysis instrument of the present invention adds electrode drive circuit module at the detecting electrode place with human contact, and electrode drive circuit module can be implemented as circuit board, can be arranged on detecting electrode place.Electrode drive circuit module can reduce the line length of Signal transmissions, reduces interference; And; voltage follower in electrode drive circuit module makes output signal be equivalent to a constant pressure source, can eliminate the impact of cable impedance, and adopts isolating transformer to be isolated by front stage circuit; play insulation blocking, adopt filtration module to play the effect of signal filtering.
As shown in Figure 7, bioelectrical impedance analysis instrument of the present invention produces the contrary two paths of differential signals of phase place by differential signal generator, is then selected the people's body loop connected by analog switch, as left hand and left foot, and the right hand and right crus of diaphragm etc.Bioelectrical impedance analysis instrument of the present invention selects the two ends of acquired signal by analog switch, and as left hand and right crus of diaphragm, the right hand and left foot etc., on detecting electrode, the order of loading frequency is followed successively by: 5khz, 50khz, 250khz, 500khz, 1khz, 1mhz.Undertaken analyzing, calculating by the direct current signal input analytical equipment containing impedance information after again the signal collected being carried out difference, filtering, the resistance value needed can be obtained.
Bioelectrical impedance analysis instrument of the present invention is provided with power isolation module, and control device 12 is connected with power supply respectively by power isolation module with analytical equipment 11.Such as, power supply is civil power 220VAC, and civil power, after the isolation of power isolation module, is carried in control device 12 with on analytical equipment 11.Power isolation module can be multiple isolation module of the prior art.Bioelectrical impedance analysis instrument of the present invention is all isolated digital signal and analogue signal, stable, ensures the normal of digital communication, and the signals security that guarantee is applied on human body.
In one embodiment, control device 12 can be implemented as single-chip microcomputer, single board computer, integrated circuit etc.Analytical equipment 11 can be implemented as single-chip microcomputer, single board computer, PC etc.Analytical equipment 12, based on detection signal, body weight information and personal information, calculates human body component parameter according to human body component detection formula and extrapolates human body indicators.Personal information comprises: age, sex, height etc.Human body indicators comprises: body fat percentage, basal metabolic rate, standard body weight, target weight etc.Analytical equipment 11 generates nutrition curve, dietary recommendation according to human body indicators and individual sports, diet information.
Analytical equipment 11 can carry out analyse to diet nutritional in conjunction with information such as individual motion, diet, sleep and various Body components and instruct, display with the nutriture of the mode of nutrition curve by individuality, make every experimenter one can be had intuitively, to be clearly familiar with to the nutrition of self, and according to take in nutrient number provide the dietary recommendation of science, avoid causing the problems such as malnutrition, nutrient imbalance or overnutrition.
Bioelectrical impedance analysis instrument of the present invention is provided with printer 13, audio output device 15, touch display screen 14, memory module and communication module 16.Printer 13 is connected with analytical equipment 11, can print analysis result etc.Audio output device 15 is connected with analytical equipment 11 and control device 12 respectively, can Play Control order, analysis result etc.Touch display screen 14 is connected with analytical equipment 11 and control device 12 respectively, can input multiple instruction, and can display and control and analysis result.Memory module is connected with analytical equipment 11, for inventory analysis result etc.Communication module 16 is connected with analytical equipment 11 and control device 12 respectively, and communication module comprises: Ethernet unit, 2G/3G radio-cell, GPRS unit, wifi unit etc., for receiving and sending messages or communicating with other equipment.
Bioelectrical impedance analysis instrument in above-described embodiment, provides man-machine dialog interface, adopts contact action mode, optimizes interactive experience; By the form that printed report exports, present measurement data in time; There is sound prompt function, in somatometry process, testee operation posture and points for attention can be pointed out, reduce the operation easier of experimenter; Measurement data can be preserved in the local database in real time, and provides external reference interface, realizes networking and can carry out data summarization and management.
Body weigher 19 is connected with control device 12, and the body weight information of detection is sent to control device 12.Body weight information, as the Back ground Information of bioelectrical impedance analysis, is the underlying parameter that human body component model calculates, if measure inaccurate or Measurement sensibility, poor repeatability, will amplifies the Output rusults affecting other compositions.
As shown in Figure 8, body weigher comprises: sensor assembly 41, power supply circuits module 44, signal amplifying and conditioning circuit module 42 and analog-to-digital conversion module 43.Sensor assembly 41, signal amplifying and conditioning circuit module 42 are connected successively with analog-to-digital conversion module 43.Analog-to-digital conversion module 43 is connected with control device 12, and the body weight information after conversion is sent to control device 12, and body weight information is sent to analytical equipment 11 and analyzes by control device 12.Power supply circuits module 44 can be powered separately to sensor assembly 41, also can power to signal amplifying and conditioning circuit module 42 and analog-to-digital conversion module 43 simultaneously.
As shown in Figure 9, signal amplifying and conditioning circuit module can have multiple implementation, such as, adopts the signal amplifying and conditioning circuit module with signal protection function that the signal of sensor assembly collection is carried out processing and amplifying.VA14, VA15, VA21, VA22 are pressure-sensitive protection device, and the signal for outside input accomplishes available protecting.R236, C388 and R240, C92 can be in steady statue by available protecting signal, the distortion causing rear class to output signal when avoiding inputting unsettled.The dual input that U47A, U47B are 160 times of operation amplifier circuits, amplify the signal that body weight sensor sends, utilize C502, C503 enhancing signal stability.
As shown in Figure 10, power supply circuits module can adopt various ways, and such as, power supply circuits module comprises: operational amplifier U66A, PNP type triode Q2 and voltage stabilizing chip U71.The VREF foot output reference voltage of voltage stabilizing chip U71.VREF foot is connected with the positive input terminal (3) of operational amplifier U66A by the first resistance R256, forms first line.One end ground connection of the second resistance R257, the other end is connected with the outfan 1 of operational amplifier U66A, forms the second circuit.
One end of first electric capacity C390 is connected on the second circuit, the other end to be connected in first line and its junction point between the second resistance R257 and outfan 1.One end ground connection of the second electric capacity C389, the other end to be connected in first line and its junction point between the junction point and the second resistance R257 of the first electric capacity C390.
The negative input end 2 of operational amplifier U66A is connected with the colelctor electrode C of audion Q2 by the 4th resistance R258, forms tertiary circuit.One end ground connection of the 3rd resistance R259, the other end are connected on tertiary circuit and it connects node and is positioned between the 4th resistance R258 and negative input end (2).The Input voltage terminal 8 of operational amplifier U66A is connected with the base stage B of audion Q2, and Input voltage terminal 8 is connected with the emitter E of audion Q2 by the 5th resistance R255.
One end of 3rd electric capacity C351 is connected on the 5th resistance R255 and emitter E line, other end ground connection.One end of power supply output lead to be connected on tertiary circuit and its junction point between the 4th resistance R258 and colelctor electrode C.One end of 4th electric capacity C391 is connected on power supply output lead, other end ground connection.The voltage of power supply output lead stable output is that sensor assembly is powered.
Power supply circuits module adopts constant voltage source to power to body weight sensor, adopt the reference source of steady voltage source as power supply circuits of 2.5V, utilize the empty short principle of the positive-negative input end of operational amplifier equivalence, by in the bleeder circuit of 2.5V reference voltage source access R258, R259, Q2, through the ratio calculation of 3 to 5 of R258 and R259, there is provided stable+4V voltage at outfan, can the high-precision power of support weight sensor power.
The bioelectrical impedance analysis instrument that above-described embodiment provides, multifrequency mode is adopted to carry out biological impedance, the outer composition of human body cell and the whole frequencies needed for cellular content measurement can be covered, make measurement result more accurate, and there is the elimination of electrode tip contact impedance, long cable impedance is eliminated, measured body weight accuracy carries high, can obtain biological component data more accurately.
Method and system of the present invention may be realized in many ways.Such as, any combination by software, hardware, firmware or software, hardware, firmware realizes method and system of the present invention.Said sequence for the step of method is only to be described, and the step of method of the present invention is not limited to above specifically described order, unless specifically stated otherwise.In addition, in certain embodiments, can be also record program in the recording medium by the invention process, these programs comprise the machine readable instructions for realizing according to method of the present invention.Thus, the present invention also covers the recording medium stored for performing the program according to method of the present invention.