CN107865661A - Respiration measurement device and method - Google Patents
Respiration measurement device and method Download PDFInfo
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- CN107865661A CN107865661A CN201610857385.2A CN201610857385A CN107865661A CN 107865661 A CN107865661 A CN 107865661A CN 201610857385 A CN201610857385 A CN 201610857385A CN 107865661 A CN107865661 A CN 107865661A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
Abstract
The invention discloses a kind of respiration measurement device and method, the respiration measurement device includes：Changing sensor and signal processing module, the mechanical deformation on body cavity surface is sensed by the changing sensor, and the mechanical deformation is converted into electric signal transmission to the signal processing module, obtain respiration measurement data to carry out signal transacting to the electric signal by the signal processing module.Contactless non-invasive measurement is realized while can improving measurement accuracy using respiration measurement device and method provided by the invention.
Description
Technical field
The present invention relates to technical field of medical equipment, more particularly to a kind of respiration measurement device and method.
Background technology
Frequency, the rhythm and pace of moving things, the depth of respiration of breathing are to monitor the important indicator of vital sign, and it can reflect children under guardianship's
Physiological status and influenceed by medicine or poisonous substance.At present, breath measuring method includes observation, impedance method, gas flow
Method, photoelectric sphyg ripple monitoring method etc..
However, no matter which kind of above-mentioned respiration measurement mode, or continuously children under guardianship can not be monitored for a long time,
Needs and direct body contact and cause children under guardianship uncomfortable, or can be disturbed by ambient light or optical medical devices
And cause measurement accuracy not high enough.
The content of the invention
Based on this, it is an object of the present invention to provide a kind of respiration measurement device and method, for solving existing skill
Above-mentioned technical problem present in art.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：
A kind of respiration measurement device, including：Changing sensor and signal processing module, sensed by the changing sensor
The mechanical deformation on body cavity surface, and the mechanical deformation is converted into electric signal transmission to the signal processing module, with logical
Cross the signal processing module and respiration measurement data are obtained to electric signal progress signal transacting.
Further, the signal processing module is included at electric signal processing unit, AD conversion unit and data signal
Unit is managed, the electric signal processing unit is filtered to the electric signal to be amplified and inputs to the AD conversion unit, with
Handle to obtain the breathing by inputting to the digital signal processing unit after AD conversion unit progress analog-to-digital conversion
Measurement data.
Further, the electric signal processing unit includes filter circuit and amplifying circuit, and the filter circuit is to described
Output is to the amplifying circuit after electric signal is filtered, to amplify filtered electric signal by the amplifying circuit.
Further, the amplifying circuit is controlled by the digital signal processing unit, at by the data signal
Reason unit enters Mobile state adjustment to the multiplication factor of the amplifying circuit.
Further, the electric signal processing unit also includes impedance inverter circuit, the impedance inverter circuit with it is described
The input of filter circuit is connected, will be exported after electric signal progress impedance conversion to the input of the filter circuit
End.
Further, the impedance inverter circuit includes charge amplifying circuit, the charge amplifying circuit include first resistor,
Second resistance, the first electric capacity and the first amplifier, the electric signal are inputted to first amplifier by the first resistor
Negative input end, the second resistance and the first electric capacity is connected in parallel between negative input end and the output end of first amplifier,
The positive input terminal ground connection of first amplifier.
Further, the impedance inverter circuit includes in-phase amplification circuit, the in-phase amplification circuit include 3rd resistor,
4th resistance, the second electric capacity and the second amplifier, the electric signal are inputted to second amplifier by the 3rd resistor
Positive input terminal, the negative input end of second amplifier is connected with output end, and the 4th resistance and the second electric capacity are connected in parallel on
Between the input and ground of the in-phase amplification circuit.
Further, the changing sensor is piezoelectric type changing sensor.
A kind of breath measuring method, including：The mechanical deformation on body cavity surface is sensed by changing sensor, and should
Mechanical deformation is converted to electric signal；Signal transacting is carried out to the electric signal and obtains respiration measurement data.
Further, the changing sensor is piezoelectric type changing sensor.
Compared with prior art, the invention has the advantages that：
By setting changing sensor and signal processing module in respiration measurement device, to be sensed by changing sensor
The mechanical deformation on body cavity surface, and the mechanical deformation is converted into electric signal transmission to signal processing module and handled,
So as to obtain respiration measurement data.
Because changing sensor can continuously carry out the sensing of mechanical deformation for a long time, both need not directly be connect with children under guardianship
Touch, will not also be disturbed by ambient light or optical medical devices, so as to efficiently solve skill present in prior art
Art problem.
It should be appreciated that the general description and following detailed description of the above are only exemplary and explanatory, not
Can the limitation present invention.
Brief description of the drawings
Accompanying drawing herein is merged in specification and forms the part of this specification, shows the implementation for meeting the present invention
Example, and in specification together for explaining principle of the invention.
The schematic diagram of body cavity change when Fig. 1 is breathing；
Fig. 2 is the schematic diagram of the respiration measurement device of an embodiment；
Fig. 3 is that Fig. 2 corresponds in embodiment signal processing module in the schematic diagram of an embodiment；
Fig. 4 a are that Fig. 3 corresponds in embodiment electric signal processing unit in the schematic diagram of an embodiment；
Fig. 4 b are that Fig. 3 corresponds in embodiment electric signal processing unit in the schematic diagram of another embodiment；
Fig. 5 is that Fig. 4 b correspond to schematic diagram of the embodiment middle impedance translation circuit in an embodiment；
Fig. 5 a are the equivalent electrical model that Fig. 5 corresponds to changing sensor in embodiment；
Fig. 6 is that Fig. 4 b correspond to schematic diagram of the embodiment middle impedance translation circuit in another embodiment；
Fig. 6 a are the equivalent electrical model that Fig. 6 corresponds to changing sensor in embodiment；
Fig. 7 is the schematic diagram of respiration measurement device in an application scenarios；
Fig. 8 is the schematic diagram of respiration measurement device in another application scene；
Fig. 9 is the flow chart of the breath measuring method of an embodiment.
Pass through above-mentioned accompanying drawing, it has been shown that the clear and definite embodiment of the present invention, will hereinafter be described in more detail, these accompanying drawings
It is not intended to limit the scope of present inventive concept by any mode with word description, but is by reference to specific embodiment
Those skilled in the art illustrate idea of the invention.
Embodiment
Here explanation will be performed to exemplary embodiment in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, of the invention.
As it was previously stated, existing breath measuring method includes observation, impedance method, gas flowrate method, photoelectric sphyg ripple prison
Survey method etc..
Wherein, observation, to obtain respiration measurement data, has by observing the fluctuating of children under guardianship's chest or belly
Cost is cheap, simple to operate, the advantages that not limited by place.But because this method needs guardian to accompany and observe, not
Suitable for continuously monitoring for a long time, and measurement accuracy is not high enough.
Impedance rule is widely applied in the Medical Devices such as patient monitor, by the way that electrocardioelectrode is direct with children under guardianship
Contact, respiration measurement data are obtained to measure the change of body impedance.This method is due to needing electrode and its fixed material and quilt
Guardian is directly contacted, and children under guardianship's skin on the one hand may be caused uncomfortable, on the other hand then may be because of children under guardianship's skin certainly
The situation of body and influence measurement accuracy.
The measurement accuracy of gas flowrate method is higher, is widely used in the Medical Devices such as lung ventilator, passes through measurement
Breathing gas flow near the respiratory tract of children under guardianship, obtains respiration measurement data.But this method is needed in children under guardianship
Respiratory tract nearby fixed tracheae, children under guardianship can be caused uncomfortable.
Photoelectric sphyg ripple monitoring method is that the volume of tissue blood when being breathed by monitoring children under guardianship changes, and is obtained with this
Respiration measurement data.This method can penetrate relatively thin gauze, it is not necessary to directly contacted with children under guardianship, but be susceptible to ring
The interference of border light or optical medical devices and cause measurement accuracy not high enough.
Therefore, in order to improve the body-sensing comfort level of children under guardianship while measurement accuracy is improved, spy proposes a kind of breathing
Measuring method.
Referring to Fig. 2, in one embodiment, a kind of respiration measurement device 100, include but is not limited to：Changing sensor 110
With signal processing module 130.
The mechanical deformation on body cavity surface is sensed by changing sensor 110, and the mechanical deformation is converted into telecommunications
Number transmit to signal processing module 130, obtaining breathing to carry out signal transacting to the electric signal by signal processing module 130 surveys
Measure data.
It should be appreciated that children under guardianship, in breathing, the form of body cavity (including abdominal cavity and thoracic cavity) can occur correspondingly to change,
Body cavity expands during air-breathing, and body cavity shrinks during expiration, as shown in Figure 1.
Changing sensor 110 is placed on to the body cavity surface of children under guardianship, changing sensor 110 will be with the change of body cavity
Change and correspondingly produce deformation, and then the deformation sensed is converted into electric signal.
Change because the electric signal that changing sensor 110 exports produces with the change of body cavity with frequency, and identical deformation frequency
Deformation is bigger under the conditions of rate, and the electric signal of output is also bigger, therefore, after electric signal is obtained, passes through signal processing module 130
Signal transacting is carried out to the electric signal and can obtain respiration measurement data.Wherein, respiration measurement data include respiratory rate and exhaled
Suction amplitude.
Further, changing sensor 110 can be pressure resistance type changing sensor, can also be that piezoelectric type deformation senses
Device.More preferably, changing sensor 110 is piezoelectric type changing sensor, it is not necessary to which the signal processing module of rear class carries out direct current point
The isolation of amount, circuit is simplified with this, be advantageous to the reduction of cost, and there is higher sensitivity, be advantageous to improve breathing
The signal to noise ratio of measurement apparatus.
Because changing sensor only senses mechanical deformation, and then enter the conversion of horizontal electrical signal by mechanical deformation, without
The electric signal of children under guardianship's body surface is measured by directly being contacted with children under guardianship, therefore, by the setting of changing sensor, both
It need not directly be contacted with children under guardianship, any stimulation or damage will not be caused to children under guardianship's skin, is realized non-contact
Formula non-invasive measurement, even and if children under guardianship's body surface also will not be to electric signal covered with the relatively thin soft object such as clothes, gauze
Generation produces any influence, is advantageous to improve measurement accuracy, is asked so as to efficiently solve technology present in prior art
Topic.
Referring to Fig. 3, in one embodiment, signal processing module 130 includes but is not limited to：Electric signal processing unit 131,
AD conversion unit 133 and digital signal processing unit 135.
Wherein, electric signal processing unit 131 is filtered to electric signal and amplifies and input to AD conversion unit 133, with
Input to the processing of digital signal processing unit 135 obtains respiration measurement number after carrying out analog-to-digital conversion by AD conversion unit 133
According to.
AD conversion unit 133 can be analog-digital converter (ADC), and the ADC can select the ADC of seniority top digit, can be with
It is trigonometric integral type ADC, ADC resolution ratio and sampling precision is improved with this, so as to is advantageous to improve the letter of respiration measurement device 100
Make an uproar and compare, be advantageous to improve measurement accuracy.
Digital signal processing unit 135 can be realized by microprocessor, and the integrated of respiration measurement device 100 is improved with this
Degree, reduce the volume of respiration measurement device 100, so as to advantageously reduce the cost of respiration measurement device 100.
Further, Fig. 4 a are referred to, in one embodiment, electric signal processing unit 131 includes but is not limited to：Filtered electrical
Road 1311 and amplifying circuit 1313.
Wherein, output is to amplifying circuit 1313 after filter circuit 1311 is filtered to electric signal, to pass through amplifying circuit
The 1313 filtered electric signals of amplification.
Filter circuit 1311 can be wave filter, to be filtered out to the low-and high-frequency signal in electric signal, while also to preceding
The noise that introduces is filtered out in level circuit, and electric signal i.e. saturation before inputting to amplifying circuit 1313 is avoided with this.According to
Different application scenarios, wave filter can select active filter or higher order filter etc..
Amplifying circuit 1313 can be in-phase amplification circuit or see-saw circuit, and filtered electric signal is amplified
To suitable voltage range.It should be appreciated that signal, on the premise of unsaturation exports, signal is exaggerated must be bigger, more favourable
In the analog-to-digital conversion of subsequent electrical signal, i.e., the significance bit for the data signal that analog signal can be converted in analog-digital conversion process
Number is more, and then is more advantageous to eliminate interference of the noise to electric signal, improves the signal to noise ratio of respiration measurement device 100.
Further, amplifying circuit 1313 is controlled by digital signal processing unit 135, to pass through digital signal processing unit
The multiplication factor of 135 pairs of amplifying circuits 1313 enters Mobile state adjustment.When the electric signal that changing sensor 110 exports is bigger than normal, then
Reduce the multiplication factor of amplifying circuit 1313, when the electric signal that changing sensor 110 exports is less than normal, then increase amplifying circuit
1313 multiplication factor, and then cause the electric signal after amplification to be adapted to being guarded for different building shape or different respiratory characteristics
People, so as to be advantageous to further improve measurement accuracy.
By setting as described above, before the analog-to-digital conversion of horizontal electrical signal is entered, one stage signal amplification and one will be passed through
Level noise filtering, effectively suppresses the noise jamming in electric signal with this, and then effectively improve the survey of respiration measurement device 100
Accuracy of measurement.
Fig. 4 b are referred to, in another embodiment, electric signal processing unit 131 also includes but is not limited to：Impedance conversion electricity
Road 1315.
Wherein, impedance inverter circuit 1315 is connected with the input of filter circuit 1311, electric signal is carried out into impedance
Exported after conversion to the input of filter circuit 1311.
Because changing sensor 110 has larger DC output resistance, before the analog-to-digital conversion of horizontal electrical signal is entered, also
Need to carry out impedance conversion, in favor of the analog-to-digital conversion of follow-up electric signal.Therefore, in the present embodiment, in filter circuit 1311
Input end connection impedance inverter circuit 1315.
Further, referring to Fig. 5, in one embodiment, impedance inverter circuit 1315 includes but is not limited to：Electric charge is put
Big circuit.
The electric signal that changing sensor 110 exports is converted to voltage signal and carries out impedance transformation by charge amplifying circuit,
To obtain the low output impedance voltage signal easily handled by late-class circuit, so as to avoid electric signal by environment high frequency signal
Interference.
The charge amplifying circuit includes first resistor 1315a, second resistance 1315b, the amplifications of the first electric capacity 1315c and first
Device 1315d.Wherein, electric signal is inputted to the first amplifier 1315d negative input end, second resistance by first resistor 1315a
1315b and the first electric capacity 1315c are connected in parallel between the first amplifier 1315d negative input end and output end, the first amplifier
1315d positive input terminal ground connection.
Specifically, first resistor 1315a is used to tentatively filter the electric signal that changing sensor 110 exports, with drop
Interference of the low high frequency to electric signal, while protect the first amplifier 1315d negative input end from the extraneous high-voltage signal such as electrostatic
Interference.
In parallel circuit, the first electric capacity 1315c is used for the electric signal for amplifying the output of changing sensor 110.Second resistance
1315b is then used to provide DC offset voltage and DC bias current for the first amplifier 1315d, and electric signal is played necessarily
Filter effect.
Because the signal that the output end of the first amplifier 1315d through charge amplifying circuit exports is free of direct current biasing,
In the absence of causing the amplifying circuit 1313 of rear class to input or export the phenomenon of saturation because of bias voltage, therefore, the first amplification
Device 1315d output end directly can be connected with filter circuit 1311, without extraly connect biasing bucking circuit or every
Straight circuit, circuit is simplified with this, advantageously reduces cost.
Further, because changing sensor 110 can be equivalent to electrically charged electric capacity CS, as shown in Figure 5 a, so, electricity
Relation between the electric signal (charge signal Q) of voltage signal and changing sensor 110 output of lotus amplifying circuit output is：
Wherein, Q be changing sensor 110 export electric signal, Cs be changing sensor 110 equivalent output capacitance, R201
For first resistor 1315a resistance, VQOFor the voltage signal of charge amplifying circuit output, R203For second resistance 1315b resistance
Value, C202For the first electric capacity 1315c capacitance, S is complex frequency domain operator.
It can thus be concluded that the voltage signal of charge amplifying circuit output is：
If by VQORelation between Q is designated as VQO=bQ, Q and children under guardianship body cavity deformation signal T caused by breathing
Between relation be designated as Q=aT, then charge amplifying circuit output voltage signal can be expressed as：
VQO=abT.
Obtaining voltage signal VQOAnd then via filter circuit 1311 filtering and amplifying circuit 1313 amplification it
Afterwards, you can input to AD conversion unit 133 carries out analog-to-digital conversion, is then received and computing by digital signal processing unit 135
Respiration measurement data are obtained, the respiration measurement to children under guardianship is realized with this.
Referring to Fig. 6, in another embodiment, impedance inverter circuit 1315 includes but is not limited to：In-phase amplification circuit.
The electric signal that changing sensor 110 exports is converted to voltage signal and carries out impedance transformation by in-phase amplification circuit,
To obtain the low output impedance voltage signal easily handled by late-class circuit, so as to avoid electric signal by environment high frequency signal
Interference, while provide certain filter action to electric signal.
The in-phase amplification circuit includes 3rd resistor 1315e, the 4th resistance 1315f, the amplifications of the second electric capacity 1315g and second
Device 1315h.Wherein, electric signal is inputted to the second amplifier 1315h positive input terminal, the second amplification by 3rd resistor 1315e
Device 1315h negative input end is connected with output end, and the 4th resistance 1315f and the second electric capacity 1315g are connected in parallel on in-phase amplification circuit
Input and ground between.
Specifically, 3rd resistor 1315e and the second electric capacity 1315g are mainly for the protection of the just defeated of the second amplifier 1315h
Enter end, prevent the interference of the extraneous high-voltage signal such as electrostatic and damage the second amplifier 1315h, while 3rd resistor 1315e and the
Two electric capacity 1315g can also play certain filter effect to electric signal.
4th resistance 1315f is used to provide bias voltage and bias current to the second amplifier 1315h positive input terminal.
Second amplifier 1315h is converted to the voltage signal of high output impedance the voltage signal of low output impedance, so as to
In late-class circuit processing.
Because the signal that the output end of the second amplifier 1315h through in-phase amplification circuit exports is free of direct current biasing,
In the absence of causing the amplifying circuit 1313 of rear class to input or export the phenomenon of saturation because of bias voltage, therefore, the second amplification
Device 1315h output end directly can be connected with filter circuit 1311, without extraly connect biasing bucking circuit or every
Straight circuit, circuit is simplified with this, advantageously reduces cost.
It should be noted that 3rd resistor 1315e and the second electric capacity 1315g can enter line position according to the application scenarios of reality
Put adjustment or even omit.Wherein, omit the second electric capacity 1315g and 3rd resistor 1315e refer to respectively disconnect the second electric capacity 1315g or
Person is short-circuit by 3rd resistor 1315e.
Further, because changing sensor 110 can be equivalent to the electric capacity C of open-circuit voltageS, as shown in Figure 6 a, so,
Pass between the electric signal (open circuit voltage signal V) that the voltage signal and changing sensor 110 of in-phase amplification circuit output export
It is to be：
Wherein, V be changing sensor 110 export electric signal, Cs be changing sensor 110 equivalent output capacitance, R301
For the 4th resistance 1315f resistance, C302For the second electric capacity 1315g capacitance, Vnon-invertFor in-phase amplification circuit output
Voltage signal, S are complex frequency domain operator.
If ignoring the second electric capacity 1315g, relation therebetween can be further simplified as：
If by Vnon-invertRelation between V is designated as Vnon-invert=cV, V and children under guardianship's body caused by breathing
Relation between chamber deformation signal T is designated as V=dT, then the voltage signal of in-phase amplification circuit output can be expressed as：
Vnon-invert=cdT.
Obtaining voltage signal Vnon-invertAnd then the filtering via filter circuit 1311 and amplifying circuit 1313
After amplification, you can input to AD conversion unit 133 carries out analog-to-digital conversion, is then received by digital signal processing unit 135
Respiration measurement data are obtained with computing, the respiration measurement to children under guardianship is realized with this.
Fig. 7 is the schematic diagram of respiration measurement device in an application scenarios.Fig. 8 is respiration measurement device in another application scene
Schematic diagram.The two main distinction is that the circuit form included in impedance inverter circuit 1315 is different, and what Fig. 7 was included is electricity
Lotus amplifying circuit, what Fig. 8 was included is in-phase amplification circuit, and remaining circuit form is consistent.
It should be noted that the respiration measurement device that said apparatus embodiment is provided is when carrying out respiration measurement, only with
The division progress of above-mentioned each functional module, can be as needed and by above-mentioned function distribution by not for example, in practical application
Same functional module is completed, i.e., the internal structure of respiration measurement device will be divided into different functional modules, to complete to retouch above
The all or part of function of stating.
Following is the inventive method embodiment, can be used for performing breath measuring method involved in the present invention.For this
The details not disclosed in inventive method embodiment, it refer to respiration measurement device embodiment involved in the present invention.
Referring to Fig. 9, in one embodiment, a kind of breath measuring method, it may comprise steps of：
Step 910, the mechanical deformation on body cavity surface is sensed by changing sensor, and the mechanical deformation is converted to
Electric signal.
Step 930, signal transacting is carried out to the electric signal and obtains respiration measurement data.
Further, changing sensor is piezoelectric type changing sensor.
When sensing mechanical deformation due to piezoelectric type changing sensor, net electricity can be produced without exciting circuit, inside it
Lotus.Therefore, piezoelectric type changing sensor does not need the signal processing module of rear class to carry out the isolation of DC component, is simplified with this
Circuit, be advantageous to the reduction of cost, and there is higher sensitivity, be advantageous to improve the signal to noise ratio of respiration measurement device.
It should be noted that breath measuring method and respiration measurement device embodiment category that above method embodiment is provided
In same design, wherein the detailed process that each step performs operation is described in detail in device embodiment, this
Place no longer repeats one by one.
The above, it is only the preferable examples embodiment of the present invention, is not intended to limit embodiment of the present invention, this
Field those of ordinary skill can very easily carry out corresponding flexible or repair according to the central scope and spirit of the present invention
Change, therefore protection scope of the present invention should be defined by the protection domain required by claims.
Claims (10)
- A kind of 1. respiration measurement device, it is characterised in that including：Changing sensor and signal processing module, pass through the deformation The mechanical deformation on sensor sensing body cavity surface, and the mechanical deformation is converted into electric signal transmission to the signal transacting Module, respiration measurement data are obtained to carry out signal transacting to the electric signal by the signal processing module.
- 2. the method as described in claim 1, it is characterised in that the signal processing module includes electric signal processing unit, mould Number converting unit and digital signal processing unit, the electric signal processing unit is filtered to the electric signal to be amplified and inputs To the AD conversion unit, to pass through input after AD conversion unit progress analog-to-digital conversion to the Digital Signal Processing Cell processing obtains the respiration measurement data.
- 3. method as claimed in claim 2, it is characterised in that the electric signal processing unit includes filter circuit and amplification electricity Road, output is to the amplifying circuit after the filter circuit is filtered to the electric signal, to be put by the amplifying circuit Big filtered electric signal.
- 4. method as claimed in claim 3, it is characterised in that the amplifying circuit is controlled by the Digital Signal Processing list Member, to enter Mobile state adjustment to the multiplication factor of the amplifying circuit by the digital signal processing unit.
- 5. method as claimed in claim 3, it is characterised in that the electric signal processing unit also includes impedance inverter circuit, The impedance inverter circuit is connected with the input of the filter circuit, will be exported after electric signal progress impedance conversion To the input of the filter circuit.
- 6. method as claimed in claim 5, it is characterised in that the impedance inverter circuit includes charge amplifying circuit, the electricity Lotus amplifying circuit includes first resistor, second resistance, the first electric capacity and the first amplifier, and the electric signal passes through the described first electricity To the negative input end of first amplifier, the second resistance and the first electric capacity are connected in parallel on first amplifier for resistance input Between negative input end and output end, the positive input terminal ground connection of first amplifier.
- 7. method as claimed in claim 5, it is characterised in that the impedance inverter circuit includes in-phase amplification circuit, and this is same Phase amplifying circuit includes 3rd resistor, the 4th resistance, the second electric capacity and the second amplifier, and the electric signal passes through the described 3rd electricity To the positive input terminal of second amplifier, the negative input end of second amplifier is connected with output end for resistance input, and described the Four resistance and the second electric capacity are connected in parallel between the input and ground of the in-phase amplification circuit.
- 8. the method as described in any one of claim 1 to 7, it is characterised in that the changing sensor passes for piezoelectric type deformation Sensor.
- A kind of 9. breath measuring method, it is characterised in that including：The mechanical deformation on body cavity surface is sensed by changing sensor, and the mechanical deformation is converted into electric signal；Signal transacting is carried out to the electric signal and obtains respiration measurement data.
- 10. method as claimed in claim 9, it is characterised in that the changing sensor is piezoelectric type changing sensor.
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| CN204971214U (en) * | 2015-07-24 | 2016-01-20 | 十堰市人民医院 | Online real -time analysis appearance of cardiovascular and cerebrovascular disease |
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| CN108451532A (en) * | 2018-04-28 | 2018-08-28 | 杜乙 | The acquisition methods and system of respiration information |
| WO2019205841A1 (en) * | 2018-04-28 | 2019-10-31 | 吴昊 | Method and system for acquiring respiration information |
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