CN103584866A - Bioelectrical impedance tidal volume monitoring method and device based on two channels - Google Patents
Bioelectrical impedance tidal volume monitoring method and device based on two channels Download PDFInfo
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Abstract
The invention discloses a bioelectrical impedance tidal volume monitoring method based on two channels. The method comprises the steps that impedance signals of a left chest part and impedance signals of a right chest part of a human subject are collected; analog-digital conversion is respectively conducted on the impedance signals of the left chest part and the impedance signals of the right chest part, and impedance digital signals of the left chest part and impedance digital signals of the right chest part are obtained; the impedance digital signals of the left chest part and the impedance digital signals of the right chest part are used for calibrating the breathing air flow of the human subject, and a calibrated resistance value is obtained; according to the calibrated resistance value, the left lung tidal volume and the right lung tidal volume of the human subject are determined. The invention further discloses a bioelectrical impedance tidal volume monitoring device based on the two channels; according to the device, measuring data can be accurately collected in a quantified mode, operation is easy, the left lung tidal volume and the right lung tidal volume of the human subject can be monitored rapidly and accurately, and tidal volume monitoring accuracy and convenience are improved.
Description
Technical field
The present invention relates to medical monitoring technical field, relate in particular to a kind of tidal volume monitoring method and device based on twin-channel bio-electrical impedance.
Background technology
At present, also do not provide clinically a kind of monitoring technology of bedside, with ventilation and perfusion and the imminent injury of lung of possibility of monitoring human part.In the prior art, the adjusting that the record of airway pressure capacity curve of arterial blood gas analysis, mechanics of lung and the plethysmography of lung are applied to following the trail of the distribution of ventilation and instruct ventilator parameter, but these technology have only reflected the pulmonary function that human body is total, and the abnormal pulmonary function of body local may be undiscovered.For this reason, image technology is as nuclear magnetic resonance, NMR, CT(Electronic Computer X-Ray Tomography Technique, electronic computer x-ray tomography technology) inhomogeneities of lung is distributed information more accurately can be provided, but this category information lacks dynamic feature and bedside monitoring capability, and need to be to patient's Critical Care; Chest x-ray can show the distribution of lung, but lacks specificity, and lonizing radiation can cause human body infringement.
The cold imaging technique of Noninvasive is as electrical impedance x-ray tomography art (Electrical Impedance Tomography, electrical impedance imaging) be called for short EIT, it is a kind of new monitoring technology, it can manifest TGV, application electrical impedance changes the imbalance that can show body local pulmonary ventilation, and the information about the inhomogeneities of lung is provided.But the image resolution ratio of EIT is low, and the electrode using is more is easy to make patient not feel well, thereby affects monitoring effect.
Summary of the invention
Technical problem to be solved by this invention is, a kind of monitoring method and device of the tidal volume based on twin-channel bio-electrical impedance are provided, by bio-electrical impedance measuring apparatus, measure the left side chest of experimenter's human body and the electrical impedance signal of right side chest, [Dan tidal volume to described experimenter is monitored, and improves accuracy of measurement and the convenience of human body tidal volume.
For solving above technical problem, on the one hand, the invention provides a kind of tidal volume monitoring method based on twin-channel bio-electrical impedance, by bio-electrical impedance measuring apparatus, experimenter to be monitored, described method comprises:
S1: the electrical impedance signal of left side chest and the electrical impedance signal of right side chest that gather experimenter;
S2: the electrical impedance signal to the electrical impedance signal of described left side chest and described right side chest carries out respectively analog digital conversion, obtains the left side electrical impedance digital signal of chest and the electrical impedance digital signal of right side chest;
S3: utilize described the electrical impedance digital signal of left side chest and the electrical impedance digital signal of described right side chest, experimenter's respiratory airflow is demarcated, obtain calibration resistance value;
S4: according to described calibration resistance value, determine described experimenter's [Dan tidal volume.
Further, described step S1 is specially:
S11: the parallel lines that form at experimenter left and right nipple and two intersection point places of left and right sides midaxillary line, the negative or positive electrode of corresponding fixing a pair of current excitation electrode;
S12: by the both positive and negative polarity of described current excitation electrode, to experimenter's input stimulus electric current;
S13: the first measurement electrode and the second measurement electrode are fixed in the both sides up and down at the parallel lines that form at experimenter left and right nipple and the intersection point place of presternum center line; Below the positive pole of being close to described current excitation electrode, fix the 3rd measurement electrode; Below the negative pole of being close to described current excitation electrode, fix the 4th measurement electrode;
S14: by described the first measurement electrode and described the 3rd measurement electrode, collect the voltage difference of described experimenter's left side chest; By described the second measurement electrode and described the 4th measurement electrode, collect the voltage difference of described experimenter's right side chest;
S15: according to the voltage difference of the size of described exciting current and the voltage difference of described left side chest, described right side chest, calculate respectively and obtain the left side electrical impedance signal of chest and the electrical impedance signal of right side chest according to Ohm's law.
In order to solve above technical problem, on the other hand, the present invention also provides a kind of tidal volume monitoring device based on twin-channel bio-electrical impedance, comprises power module, also comprises:
Data acquisition module, for gathering experimenter's the electrical impedance signal of left side chest and the electrical impedance signal of right side chest;
Analog-to-digital conversion module, for the electrical impedance signal of the electrical impedance signal of described left side chest and described right side chest is carried out respectively to analog digital conversion, obtains the left side electrical impedance digital signal of chest and the electrical impedance digital signal of right side chest;
Signal processing module, for utilizing described the electrical impedance digital signal of left side chest and the electrical impedance digital signal of described right side chest, demarcates experimenter's respiratory airflow, obtains calibration resistance value;
Described signal processing module, also, for according to described calibration resistance value, determines described experimenter's [Dan tidal volume;
Described power module, for powering to above-mentioned each functional module.
Further, described data acquisition module comprises: current excitation electrode, constant-current source module, the first measurement electrode, the second measurement electrode, the 3rd measurement electrode and the 4th measurement electrode;
The both positive and negative polarity of described current excitation electrode is separately fixed at the parallel lines of experimenter left and right nipple formation and two intersection point places of left and right sides midaxillary line;
Described constant-current source module, for passing through the both positive and negative polarity of described current excitation electrode, to experimenter's input stimulus electric current;
Described the first measurement electrode and described the second measurement electrode are separately fixed at the both sides up and down at the parallel lines of experimenter left and right nipple formation and the intersection point place of presternum center line;
Described the 3rd measurement electrode is fixed on the anodal below of being close to described current excitation electrode; Described the 4th measurement electrode is fixed on the negative pole below of being close to described current excitation electrode;
Described data acquisition module, for by described the first measurement electrode and described the 3rd measurement electrode, gathers the voltage difference of described experimenter's left side chest; By described the second measurement electrode and described the 4th measurement electrode, gather the voltage difference of described experimenter's right side chest;
Described signal processing module, for according to the voltage difference of the size of described exciting current and the voltage difference of described left side chest, described right side chest, according to Ohm's law calculate respectively obtain on the left of the electrical impedance signal of chest and the electrical impedance signal of right side chest.
Tidal volume monitoring method and device based on twin-channel bio-electrical impedance that the embodiment of the present invention provides, utilize bio-electrical impedance technology, by gathering experimenter's the electrical impedance signal of left side chest and the electrical impedance signal of right side chest, and carry out after analog digital conversion, obtain the left side electrical impedance digital signal of chest and the electrical impedance digital signal of right side chest, then by the respiratory airflow recording, calibrate, according to the resistance value after calibration, determine described experimenter's [Dan tidal volume.The method is simple, and anti-jamming effectiveness is good, can quantitatively gather exactly measurement data, can effectively reduce the usage quantity of monitoring instrument, simple to operate, can realize rapidly and accurately the monitoring to experimenter's [Dan tidal volume, and avoid the somatic damage to experimenter.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of the monitoring method of the tidal volume based on twin-channel bio-electrical impedance that provides of the embodiment of the present invention one;
Fig. 2 is the method flow diagram of a kind of specific implementation of the embodiment of the present invention one step S1;
Fig. 3 is the schematic diagram of wearing of current excitation electrode in the embodiment of the present invention one and measurement electrode;
Fig. 4 is a kind of structural representation of the tidal volume monitoring device based on twin-channel bio-electrical impedance that provides of the embodiment of the present invention two;
Fig. 5 is another structural representation of the tidal volume monitoring device based on twin-channel bio-electrical impedance that provides of the embodiment of the present invention two.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.Obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of protection of the invention.
Embodiment mono-
Referring to Fig. 1, it is the method flow diagram of the tidal volume monitoring method based on twin-channel bio-electrical impedance that provides of the embodiment of the present invention one.
In the present embodiment, the described tidal volume monitoring method based on twin-channel bio-electrical impedance, applying biological impedance bioelectrical measurement device detects Human Lung tidal volume, said method comprising the steps of:
Step S1: the electrical impedance signal of left side chest and the electrical impedance signal of right side chest that gather experimenter.
Step S2: the electrical impedance signal to the electrical impedance signal of described left side chest and described right side chest carries out respectively analog digital conversion, obtains the left side electrical impedance digital signal of chest and the electrical impedance digital signal of right side chest.
Step S3: utilize described the electrical impedance digital signal of left side chest and the electrical impedance digital signal of described right side chest, experimenter's respiratory airflow is demarcated, obtain calibration resistance value.
Step S4: according to described calibration resistance value, determine described experimenter's [Dan tidal volume.
Preferably, described step S3 adopts Biopac polygraph to demarcate experimenter's respiratory airflow.
During concrete enforcement, adopt bio-electrical impedance measuring apparatus (tidal volume monitoring device) to carry out the monitoring to experimenter's tidal volume, its main working process comprises: by a plurality of electrodes that are connected with this tidal volume monitoring device, realization gathers the electrical impedance signal (analogue signal) of human body two thoracotomies, and described electrical impedance signal is converted to the analyzing and processing of carrying out signal after digital signal; According to the electrical impedance digital signal of the electrical impedance digital signal of the left side chest obtaining and right side chest, by respiratory airflow, calibrate, according to the resistance value after calibration, determine described experimenter's [Dan tidal volume.
As preferred embodiment, affiliated step S1 can utilize ohm law to gather the electrical impedance signal of human chest.
Referring to Fig. 2, it is the method flow diagram of a kind of specific implementation of the embodiment of the present invention one step S1.
A kind of can implementation in, described step S1 specifically comprises the following steps:
Step S11: the parallel lines that form at experimenter left and right nipple and two intersection point places of left and right sides midaxillary line, the negative or positive electrode of corresponding fixing a pair of current excitation electrode.
Step S12: by the both positive and negative polarity of described current excitation electrode, to experimenter's input stimulus electric current.
Step S13: the first measurement electrode and the second measurement electrode are fixed in the both sides up and down at the parallel lines that form at experimenter left and right nipple and the intersection point place of presternum center line; Below the positive pole of being close to described current excitation electrode, fix the 3rd measurement electrode; Below the negative pole of being close to described current excitation electrode, fix the 4th measurement electrode.
Step S14: by described the first measurement electrode and described the 3rd measurement electrode, collect the voltage difference of described experimenter's left side chest; By described the second measurement electrode and described the 4th measurement electrode, collect the voltage difference of described experimenter's right side chest.
Step S15: according to the voltage difference of the size of described exciting current and the voltage difference of described left side chest, described right side chest, calculate respectively and obtain the left side electrical impedance signal of chest and the electrical impedance signal of right side chest according to Ohm's law.
Referring to Fig. 3, it is the schematic diagram of wearing of current excitation electrode in the embodiment of the present invention one and measurement electrode.
During concrete enforcement, the negative pole I-of current excitation electrode can be fixed on to parallel lines and the intersection point place of right side midaxillary line that experimenter or patient's left and right nipple forms, the anodal I+ of current excitation electrode be fixed on to experimenter or patient's the parallel lines of left and right nipple formation and the intersection point place of left side midaxillary line; The first measurement electrode V1 is fixed on to experimenter or patient's the parallel lines of left and right nipple formation and the upper end at the intersection point place of presternum center line; The second measurement electrode V2 is fixed on to experimenter or patient's the parallel lines of left and right nipple formation and the lower end at the intersection point place of presternum center line; The 3rd measurement electrode V3 is fixed on to the intersection point place of experimenter or patient's left side midaxillary line and the parallel lines that left and right nipple forms, particularly, in the below of being close to the current excitation electrode in experimenter or patient's left side (being anodal I+), described the 3rd measurement electrode V3 is fixed; The intersection point place that the 4th measurement electrode V4 is fixed on to experimenter or patient's right side midaxillary line and the parallel lines that left and right nipple forms, particularly, is fixed described the 4th measurement electrode V4 in the below of being close to the current excitation electrode on right side (being negative pole I-).
In described step S14, the voltage difference of experimenter's left side chest is (V3-V1), and the voltage difference of right side chest is (V4-V2), and is I to the exciting current of experimenter's input, perform step S15, can calculate the electrical impedance signal that obtains experimenter left and right sides chest.
Particularly, according to Ohm's law, the electrical impedance signal of experimenter left side chest is R
l=| (V3-V1) |/I; The electrical impedance signal of right side chest is R
r=| (V4-V2) |/I.Wherein, parameter | (V3-V1) | and be the absolute value of the voltage difference of left side chest, parameter | (V4-V2) | be the absolute value of the voltage difference of right side chest, take and guarantee that the sizes values of the electrical impedance signal that calculates is positive number.
Further, described step S3 can utilize the oscillogram of the respiratory airflow that Biopac polygraph records, and its step comprises:
Step S31: the magnitude of voltage oscillogram of the respiratory airflow of measuring, to demarcate the size of experimenter's respiratory airflow;
Step S32: utilize the electrical impedance digital signal of described left side chest and the electrical impedance digital signal of described right side chest, the magnitude of voltage of described respiratory airflow is demarcated, obtain described calibration resistance value.
Again further, described step S4 is specially:
According to described calibration resistance value, after once air-breathing calibration resistance value is added by experimenter, be defined as the value of experimenter's tidal volume, comprising: when experimenter is once air-breathing, the calibration resistance value of left lung is added the tidal volume as the left lung of experimenter; When experimenter is once air-breathing, the calibration resistance value of right lung is added the tidal volume as experimenter's right lung.
Biopac polygraph provides a plurality of computing functions, can carry out signal smoothing, stack, and differential, integration, Fourier transformation, spectrum analysis, masterplate is searched, signal averaging, peak detection etc.User can carry out various mathematical operations to the signal of each passage of Biopac polygraph by self-designed computing formula, thereby completes the functions such as the left chamber of picture diastasis pressure calculates, the demonstration of neural discharge numeration rectangular histogram.Due to the flexible software design of Biopac polygraph, user can require design calculation formula and store according to implementing, to directly call in similar experiment or operation.Therefore, the embodiment of the present invention, when utilizing Biopac polygraph to carry out the monitoring of tidal volume to experimenter or patient, can improve accuracy and the convenience of demarcation.
In the present embodiment, adopt scaling method to realize the monitoring to experimenter's [Dan tidal volume.
The measuring method of the tidal volume based on twin-channel bio-electrical impedance that particularly, the present embodiment provides can adopt the tidal volume monitoring device shown in Fig. 4 and connected a plurality of electrode pair experimenter to test.Wherein, described electrode comprises for the current excitation electrode to left and right sides chest input stimulus electric current, and for gathering a plurality of measurement electrode of the voltage magnitude difference of left and right sides chest.
The monitoring method of the tidal volume based on twin-channel bio-electrical impedance that the embodiment of the present invention provides, according to obtaining the left side electrical impedance digital signal of chest and the electrical impedance digital signal of right side chest, the respiratory airflow recording according to Biopac polygraph is calibrated, and obtains calibration resistance value.According to described calibration resistance value, described experimenter's [Dan tidal volume is determined.The method is simple, and anti-jamming effectiveness is good, can quantitatively gather exactly measurement data, can effectively reduce the usage quantity of monitoring instrument, simple to operate, can realize quickly and accurately the monitoring to experimenter's [Dan tidal volume.
Embodiment bis-
The embodiment of the present invention also provides a kind of tidal volume monitoring device based on twin-channel bio-electrical impedance, is applied to measure the lung tidal volume of human body.
Referring to Fig. 4, it is a kind of structural representation of the tidal volume monitoring device based on twin-channel bio-electrical impedance that provides of the embodiment of the present invention two.
The tidal volume monitoring device based on twin-channel bio-electrical impedance that the present embodiment provides comprises power module 401, also comprises:
Data acquisition module 402, for gathering experimenter's the electrical impedance signal of left side chest and the electrical impedance signal of right side chest.
Analog-to-digital conversion module 403, for the electrical impedance signal of the electrical impedance signal of described left side chest and described right side chest is carried out respectively to analog digital conversion, obtains the left side electrical impedance digital signal of chest and the electrical impedance digital signal of right side chest.
Signal processing module 404, for utilizing described the electrical impedance digital signal of left side chest and the electrical impedance digital signal of described right side chest, demarcates experimenter's respiratory airflow, obtains calibration resistance value.
Described signal processing module 404, also, for according to described calibration resistance value, determines described experimenter's [Dan tidal volume.
Described power module 401, for powering to above-mentioned each functional module.
In the present embodiment, described signal processing module 404 preferably adopts Biopac polygraph to demarcate experimenter's respiratory airflow.
A kind of can implementation in, described data acquisition module 402 comprises: current excitation electrode (anodal I+ and negative pole I-), constant-current source module 4021, the first measurement electrode V1, the second measurement electrode V2, the 3rd measurement electrode V3 and the 4th measurement electrode V4.
Referring to Fig. 5, it is another structural representation of the tidal volume monitoring device based on twin-channel bio-electrical impedance that provides of the embodiment of the present invention two.
As shown in Figure 5, the both positive and negative polarity of described current excitation electrode (I+ or I-) is separately fixed at the parallel lines of experimenter left and right nipple formation and two intersection point places of left and right sides midaxillary line.
Described constant-current source module 4021, for passing through the both positive and negative polarity (I+ or I-) of described current excitation electrode, to experimenter's input stimulus electric current;
Described the first measurement electrode V1 and described the second measurement electrode V2 are separately fixed at the both sides up and down at the parallel lines of experimenter left and right nipple formation and the intersection point place of presternum center line;
Described the 3rd measurement electrode V3 is fixed on the anodal below of being close to described current excitation electrode; Described the 4th measurement electrode V4 is fixed on the negative pole below of being close to described current excitation electrode;
Described data acquisition module 402, for by described the first measurement electrode V1 and described the 3rd measurement electrode V3, gathers the voltage difference of described experimenter's left side chest; By described the second measurement electrode V2 and described the 4th measurement electrode V4, gather the voltage difference of described experimenter's right side chest; During concrete enforcement, described data acquisition module 402 is also provided with multi-channel switch 4022, for accessing the measuring voltage value of described the first measurement electrode V1, the second measurement electrode V2, the 3rd measurement electrode V3 and the 4th measurement electrode V4, and the magnitude of voltage measuring is sent to analog-to-digital conversion module 403.Analog-to-digital conversion module 403 is converted to digital signal by the excitation electric flow valuve receiving and each measuring voltage value, and sends to signal processing module 404.
Described signal processing module 404, for according to the voltage difference of the size of described exciting current and the voltage difference of described left side chest, described right side chest, according to Ohm's law calculate respectively obtain on the left of the electrical impedance signal of chest and the electrical impedance signal of right side chest.
Further, described signal processing module 404 comprises:
Throughput is measured module 4041, for the magnitude of voltage oscillogram of the respiratory airflow measured, to demarcate the size of experimenter's respiratory airflow;
In the present embodiment, described signal processing module 404 also comprises:
Tidal volume is measured module 4043, be used for according to described calibration resistance value, after once air-breathing calibration resistance value is added by experimenter, be defined as the value of experimenter's tidal volume, comprise: when experimenter is once air-breathing, the calibration resistance value of left lung is added the tidal volume as the left lung of experimenter; When experimenter is once air-breathing, the calibration resistance value of right lung is added the tidal volume as experimenter's right lung.
The monitoring device of the tidal volume based on twin-channel bio-electrical impedance that the embodiment of the present invention provides, according to obtaining the left side electrical impedance digital signal of chest and the electrical impedance digital signal of right side chest, calibrates the respiratory airflow recording.According to the resistance value after calibration, described experimenter's [Dan tidal volume is monitored.The method is simple, and anti-jamming effectiveness is good, can quantitatively gather exactly measurement data, can effectively reduce the usage quantity of monitoring instrument, simple to operate, can realize quickly and accurately the monitoring to experimenter's [Dan tidal volume.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. the tidal volume monitoring method based on twin-channel bio-electrical impedance, is characterized in that, comprising:
S1: the electrical impedance signal of left side chest and the electrical impedance signal of right side chest that gather experimenter;
S2: the electrical impedance signal to the electrical impedance signal of described left side chest and described right side chest carries out respectively analog digital conversion, obtains the left side electrical impedance digital signal of chest and the electrical impedance digital signal of right side chest;
S3: utilize described the electrical impedance digital signal of left side chest and the electrical impedance digital signal of described right side chest, experimenter's respiratory airflow is demarcated, obtain calibration resistance value;
S4: according to described calibration resistance value, determine described experimenter's [Dan tidal volume.
2. the tidal volume monitoring method based on twin-channel bio-electrical impedance as claimed in claim 1, is characterized in that, described step S1 is specially:
S11: the parallel lines that form at experimenter left and right nipple and two intersection point places of left and right sides midaxillary line, the negative or positive electrode of corresponding fixing a pair of current excitation electrode;
S12: by the both positive and negative polarity of described current excitation electrode, to experimenter's input stimulus electric current;
S13: the first measurement electrode and the second measurement electrode are fixed in the both sides up and down at the parallel lines that form at experimenter left and right nipple and the intersection point place of presternum center line; Below the positive pole of being close to described current excitation electrode, fix the 3rd measurement electrode; Below the negative pole of being close to described current excitation electrode, fix the 4th measurement electrode;
S14: by described the first measurement electrode and described the 3rd measurement electrode, collect the voltage difference of described experimenter's left side chest; By described the second measurement electrode and described the 4th measurement electrode, collect the voltage difference of described experimenter's right side chest;
S15: according to the voltage difference of the size of described exciting current and the voltage difference of described left side chest, described right side chest, calculate respectively and obtain the left side electrical impedance signal of chest and the electrical impedance signal of right side chest according to Ohm's law.
3. the tidal volume monitoring method based on twin-channel bio-electrical impedance as claimed in claim 1, is characterized in that, described step S3 comprises:
S31: the magnitude of voltage oscillogram of the respiratory airflow of measuring, to demarcate the size of experimenter's respiratory airflow;
S32: utilize the electrical impedance digital signal of described left side chest and the electrical impedance digital signal of described right side chest, the magnitude of voltage of described respiratory airflow is demarcated, obtain described calibration resistance value.
4. the tidal volume monitoring method based on twin-channel bio-electrical impedance as claimed in claim 1, is characterized in that, described step S4 is specially:
According to described calibration resistance value, after once air-breathing calibration resistance value is added by experimenter, be defined as the value of experimenter's tidal volume, comprising: when experimenter is once air-breathing, the calibration resistance value of left lung is added the tidal volume as the left lung of experimenter; When experimenter is once air-breathing, the calibration resistance value of right lung is added the tidal volume as experimenter's right lung.
5. the tidal volume monitoring method based on twin-channel bio-electrical impedance as described in claim 1～4 any one, is characterized in that, described step S3 adopts Biopac polygraph to demarcate experimenter's respiratory airflow.
6. the tidal volume monitoring device based on twin-channel bio-electrical impedance, comprises power module, it is characterized in that, the monitoring device of described tidal volume also comprises:
Data acquisition module, for gathering experimenter's the electrical impedance signal of left side chest and the electrical impedance signal of right side chest;
Analog-to-digital conversion module, for the electrical impedance signal of the electrical impedance signal of described left side chest and described right side chest is carried out respectively to analog digital conversion, obtains the left side electrical impedance digital signal of chest and the electrical impedance digital signal of right side chest;
Signal processing module, for utilizing described the electrical impedance digital signal of left side chest and the electrical impedance digital signal of described right side chest, demarcates experimenter's respiratory airflow, obtains calibration resistance value;
Described signal processing module, also, for according to described calibration resistance value, determines described experimenter's [Dan tidal volume;
Described power module, for powering to above-mentioned each functional module.
7. the tidal volume monitoring device based on twin-channel bio-electrical impedance as claimed in claim 6, it is characterized in that, described data acquisition module comprises: current excitation electrode, constant-current source module, the first measurement electrode, the second measurement electrode, the 3rd measurement electrode and the 4th measurement electrode;
The both positive and negative polarity of described current excitation electrode is separately fixed at the parallel lines of experimenter left and right nipple formation and two intersection point places of left and right sides midaxillary line;
Described constant-current source module, for passing through the both positive and negative polarity of described current excitation electrode, to experimenter's input stimulus electric current;
Described the first measurement electrode and described the second measurement electrode are separately fixed at the both sides up and down at the parallel lines of experimenter left and right nipple formation and the intersection point place of presternum center line;
Described the 3rd measurement electrode is fixed on the anodal below of being close to described current excitation electrode; Described the 4th measurement electrode is fixed on the negative pole below of being close to described current excitation electrode;
Described data acquisition module, for by described the first measurement electrode and described the 3rd measurement electrode, gathers the voltage difference of described experimenter's left side chest; By described the second measurement electrode and described the 4th measurement electrode, gather the voltage difference of described experimenter's right side chest;
Described signal processing module, for according to the voltage difference of the size of described exciting current and the voltage difference of described left side chest, described right side chest, according to Ohm's law calculate respectively obtain on the left of the electrical impedance signal of chest and the electrical impedance signal of right side chest.
8. the tidal volume monitoring device based on twin-channel bio-electrical impedance as claimed in claim 6, is characterized in that, described signal processing module comprises:
Throughput is measured module, for the magnitude of voltage oscillogram of the respiratory airflow measured, to demarcate the size of experimenter's respiratory airflow;
Impedance calibration module, for utilizing the electrical impedance digital signal of described left side chest and the electrical impedance digital signal of described right side chest, demarcates the magnitude of voltage of described respiratory airflow, obtains described calibration resistance value.
9. the tidal volume monitoring device based on twin-channel bio-electrical impedance as claimed in claim 6, is characterized in that, described signal processing module also comprises:
Tidal volume is measured module, be used for according to described calibration resistance value, after once air-breathing calibration resistance value is added by experimenter, be defined as the value of experimenter's tidal volume, comprise: when experimenter is once air-breathing, the calibration resistance value of left lung is added the tidal volume as the left lung of experimenter; When experimenter is once air-breathing, the calibration resistance value of right lung is added the tidal volume as experimenter's right lung.
10. the tidal volume monitoring device based on twin-channel bio-electrical impedance as described in claim 6～9 any one, is characterized in that, described signal processing module adopts Biopac polygraph to demarcate experimenter's respiratory airflow.
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