CN105054935A - Respiration signal detecting terminal - Google Patents
Respiration signal detecting terminal Download PDFInfo
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- CN105054935A CN105054935A CN201510583064.3A CN201510583064A CN105054935A CN 105054935 A CN105054935 A CN 105054935A CN 201510583064 A CN201510583064 A CN 201510583064A CN 105054935 A CN105054935 A CN 105054935A
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- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention discloses a respiration signal detecting terminal which comprises a single-chip microcomputer, a sine wave signal source generator, a DC blocking amplifier, a V/I changing circuit, an instrument amplifier, a full-wave rectification circuit and a band-pass filter. The V/I changing circuit and the instrument amplifier are each provided with two electrodes for being connected with a human cavity. The V/I changing circuit is connected with the DC blocking amplifier. The instrument amplifier is connected with the full-wave rectification circuit. The single-chip microcomputer is connected with the sine wave signal source generator and an A/D converter. The band-pass filter is arranged between the A/D converter and the full-wave rectification circuit. The DC blocking amplifier is connected between the V/I changing circuit and the sine wave signal source generator. According to the principle, clear and stable respiration impedance curve can be observed without a sensor, the interference of a contact resistor to measurement signals is reduced in the detection process, and the measurement data accuracy is further improved.
Description
Technical field
The present invention relates to Intensive Care Therapy field, be specifically related to breath signal sense terminals.
Background technology
Since the custodial care facility appearance of the simple function that 20 century 70s have, it just progressively obtains the extensive use of clinical monitoring.But the custodial care facility of simple function is due to the limitation of its monitoring function, far can not meet the needs of clinical practice, seriously constrain the rescue of hospital to numerous critical patients.Enter the nineties, along with the development of sensing technology and electronic technology, monitored parameters is on the increase, and is guarded develop into multi-parameter monitoring by the single parameter in past.Such as guarded by single cardiac monitoring, blood pressure monitoring, blood oxygen saturation, progressively develop into the multi-parameter monitor comprising electrocardio, breathing, blood pressure, blood oxygen saturation, body temperature, End-tidal carbon dioxide, cardiac output and anesthetic gases analysis etc., these equipment just play positive effect in the diagnosis of hospital clinical.Nowadays in the process detected breath signal, need the auxiliary sensor that uses just can record respiratory impedance curve, and existing checkout gear in use contact resistance measuring-signal is had a negative impact, the final accuracy measured breath signal and detect of impact.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, breath signal sense terminals is provided, this checkout gear also can observe steady and audible respiratory impedance curve without the need to using sensor, and contact resistance, to the interference of measuring-signal, further increases the accuracy of measurement data in testing process.
For solving above-mentioned technical problem, the present invention is by the following technical solutions: breath signal sense terminals, comprise single-chip microcomputer, sine wave signal source generator, every straight amplifier, V/I translation circuit, instrument amplifier, full-wave rectifying circuit and band filter, described V/I translation circuit with instrument amplifier is all arranged two electrodes for being connected body cavity, V/I translation circuit also connects every straight amplifier, and instrument amplifier also connects full-wave rectifying circuit; Described single-chip microcomputer connects sine wave signal source generator and A/D converter simultaneously, goes back connecting band bandpass filter between A/D converter and full-wave rectifying circuit; Describedly to be connected between V/I translation circuit and sine wave signal source generator every straight amplifier.The sine wave source of 50kHz is obtained by Single-chip Controlling sine wave signal source generator, by after the DC component of straight amplifier filtering sinusoidal signal, signal is just obtained the sine wave source of the 50kHz of standard after exchanging and amplifying, more just can be obtained the sinusoidal wave constant-current source of 1mA of 50kHz by V/I translation circuit.This constant-current source is applied on torso model, what obtain from measurement electrode two ends is a high-frequency am signal modulated by breath signal, recycling instrument amplifier amplifies detection signal, then full-wave rectifying circuit is utilized to carry out demodulation to high-frequency am signal, detect the envelope of high-frequency signal amplitude change, this envelope is the signal with impedance variation, most relief impedance change signal is by the band filter of 0.08Hz ~ 10Hz, filtering DC component and high frequency spurs interference, just can obtain the prototype of breath signal, after breath signal digitized, utilize to further process in embedded computer system and just can obtain breath signal.This device uses other sensors also can observe steady and audible respiratory impedance curve without the need to additionally assisting, V/I translation circuit in this device with instrument amplifier is all arranged two electrodes for being connected body cavity, four electrode constant-current driving methods are adopted to carry out, substantially reduce contact resistance to the impact of measuring breath signal, improve the accuracy of measurement result.
The model of described single-chip microcomputer is C8051F020.This single-chip microcomputer is a kind of mixed-signal system level single-chip microcomputer that Cygnal goes out.Sheet includes the CPU core of CIP-51, and its instruction system and MCS-51 are completely compatible.C8051F020 single-chip microcomputer wherein contains Flash program storage in 64kB sheet, and the RAM of 4352B, 8 I/O ports be the part such as the programmable count/Timer Array of totally 64 I/O mouth lines, 12 A/D converters and 8 A/D converters and two 12 D/A converters, 2 comparators, 5 16 general purpose timers, 5 seizure/comparison modules, WatchDog Timer, VDD monitor and temperature sensor.Doubleclocking supported by C8051F020 single-chip microcomputer, and its operating voltage range is 2.7 ~ 3.6V(port I/O, and the withstand voltage of RST and JTAG pin is 5V).Compared with 51 former series monolithics, C8051F020 adds many functions, and its reliability and speed there has also been large increase simultaneously, uses the monolithic function of this model to improve breath signal and detect several times in this device.
The model of described sine wave signal source generator is AD9833.This waveform generator can produce the periodic signal of random waveform, the frequency amplitude of the flexible control signal of energy, phase place, and in very wide scope quick switching frequency, there is high-resolution export, use DDS technique construction frequency signal source, the signal frequency of continuous accurate adjustment can be obtained, amplitude phase controlling is convenient, and memory capacity is large; It is few that AWG accounts for microsystem resource, improves the response speed of device.
The model of described instrument amplifier is PCA206.The instrument amplifier of this model can be satisfied the demand completely.
Compared with prior art, the invention has the beneficial effects as follows:
1, the V/I translation circuit in this device with instrument amplifier is all arranged two electrodes for being connected body cavity, adopt four electrode constant-current driving methods to carry out, substantially reducing contact resistance to measuring the impact of breath signal, improve the accuracy of measurement result.
2, this device uses other sensors also can observe steady and audible respiratory impedance curve without the need to additionally assisting.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further elaborated, and embodiments of the invention are not limited thereto.
Embodiment 1:
As shown in Figure 1, the present invention includes single-chip microcomputer, sine wave signal source generator, every straight amplifier, V/I translation circuit, instrument amplifier, full-wave rectifying circuit and band filter, described V/I translation circuit with instrument amplifier is all arranged two electrodes for being connected body cavity, V/I translation circuit also connects every straight amplifier, and instrument amplifier also connects full-wave rectifying circuit; Described single-chip microcomputer connects sine wave signal source generator and A/D converter simultaneously, goes back connecting band bandpass filter between A/D converter and full-wave rectifying circuit; Describedly to be connected between V/I translation circuit and sine wave signal source generator every straight amplifier.
The sine wave source of 50kHz is obtained by Single-chip Controlling sine wave signal source generator, by after the DC component of straight amplifier filtering sinusoidal signal, signal is just obtained the sine wave source of the 50kHz of standard after exchanging and amplifying, more just can be obtained the sinusoidal wave constant-current source of 1mA of 50kHz by V/I translation circuit.This constant-current source is applied on torso model, what obtain from measurement electrode two ends is a high-frequency am signal modulated by breath signal, recycling instrument amplifier amplifies detection signal, then full-wave rectifying circuit is utilized to carry out demodulation to high-frequency am signal, detect the envelope of high-frequency signal amplitude change, this envelope is the signal with impedance variation, most relief impedance change signal is by the band filter of 0.08Hz ~ 10Hz, filtering DC component and high frequency spurs interference, just can obtain the prototype of breath signal, after breath signal digitized, utilize to further process in embedded computer system and just can obtain breath signal.This device uses other sensors also can observe steady and audible respiratory impedance curve without the need to additionally assisting, V/I translation circuit in this device with instrument amplifier is all arranged two electrodes for being connected body cavity, four electrode constant-current driving methods are adopted to carry out, substantially reduce contact resistance to the impact of measuring breath signal, improve the accuracy of measurement result.
Embodiment 2:
The present embodiment is preferably as follows on the basis of embodiment 1: the model of described single-chip microcomputer is C8051F020.This single-chip microcomputer is a kind of mixed-signal system level single-chip microcomputer that Cygnal goes out.Sheet includes the CPU core of CIP-51, and its instruction system and MCS-51 are completely compatible.C8051F020 single-chip microcomputer wherein contains Flash program storage in 64kB sheet, and the RAM of 4352B, 8 I/O ports be the part such as the programmable count/Timer Array of totally 64 I/O mouth lines, 12 A/D converters and 8 A/D converters and two 12 D/A converters, 2 comparators, 5 16 general purpose timers, 5 seizure/comparison modules, WatchDog Timer, VDD monitor and temperature sensor.Doubleclocking supported by C8051F020 single-chip microcomputer, and its operating voltage range is 2.7 ~ 3.6V(port I/O, and the withstand voltage of RST and JTAG pin is 5V).Compared with 51 former series monolithics, C8051F020 adds many functions, and its reliability and speed there has also been large increase simultaneously, uses the monolithic function of this model to improve breath signal and detect several times in this device.
The model of described sine wave signal source generator is AD9833.This waveform generator can produce the periodic signal of random waveform, the frequency amplitude of the flexible control signal of energy, phase place, and in very wide scope quick switching frequency, there is high-resolution export, use DDS technique construction frequency signal source, the signal frequency of continuous accurate adjustment can be obtained, amplitude phase controlling is convenient, and memory capacity is large; It is few that AWG accounts for microsystem resource, improves the response speed of device.
The model of described instrument amplifier is PCA206.The instrument amplifier of this model can be satisfied the demand completely.
Just this invention can be realized as mentioned above.
Claims (4)
1. breath signal sense terminals, it is characterized in that: comprise single-chip microcomputer, sine wave signal source generator, every straight amplifier, V/I translation circuit, instrument amplifier, full-wave rectifying circuit and band filter, described V/I translation circuit with instrument amplifier is all arranged two electrodes for being connected body cavity, V/I translation circuit also connects every straight amplifier, and instrument amplifier also connects full-wave rectifying circuit; Described single-chip microcomputer connects sine wave signal source generator and A/D converter simultaneously, goes back connecting band bandpass filter between A/D converter and full-wave rectifying circuit; Describedly to be connected between V/I translation circuit and sine wave signal source generator every straight amplifier.
2. breath signal sense terminals according to claim 1, is characterized in that: the model of described single-chip microcomputer is C8051F020.
3. breath signal sense terminals according to claim 1, is characterized in that: the model of described sine wave signal source generator is AD9833.
4. breath signal sense terminals according to claim 1, is characterized in that: the model of described instrument amplifier is PCA206.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510583064.3A CN105054935A (en) | 2015-09-15 | 2015-09-15 | Respiration signal detecting terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510583064.3A CN105054935A (en) | 2015-09-15 | 2015-09-15 | Respiration signal detecting terminal |
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| CN105054935A true CN105054935A (en) | 2015-11-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109452936A (en) * | 2018-12-15 | 2019-03-12 | 浙江大学台州研究院 | Breathing and heart stroke combined monitoring equipment |
| CN115399750A (en) * | 2022-07-25 | 2022-11-29 | 知心健(南京)科技有限公司 | Method for measuring respiratory impedance |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080275361A1 (en) * | 2004-09-06 | 2008-11-06 | Smartex S.R.L. | Device for the Monitoring of Physiologic Variables Through Measurement of Body Electrical Impedance |
| CN201341881Y (en) * | 2009-01-14 | 2009-11-11 | 河北工业大学 | Bio-electrical impedance imaging device for 128 passage |
| WO2011129474A1 (en) * | 2010-04-15 | 2011-10-20 | (주)누가의료기 | Device and method for monitoring pulmonary function using impedance of both hands |
| CN204950951U (en) * | 2015-09-15 | 2016-01-13 | 成都汉康信息产业有限公司 | Breathe signal detection device |
-
2015
- 2015-09-15 CN CN201510583064.3A patent/CN105054935A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080275361A1 (en) * | 2004-09-06 | 2008-11-06 | Smartex S.R.L. | Device for the Monitoring of Physiologic Variables Through Measurement of Body Electrical Impedance |
| CN201341881Y (en) * | 2009-01-14 | 2009-11-11 | 河北工业大学 | Bio-electrical impedance imaging device for 128 passage |
| WO2011129474A1 (en) * | 2010-04-15 | 2011-10-20 | (주)누가의료기 | Device and method for monitoring pulmonary function using impedance of both hands |
| CN204950951U (en) * | 2015-09-15 | 2016-01-13 | 成都汉康信息产业有限公司 | Breathe signal detection device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109452936A (en) * | 2018-12-15 | 2019-03-12 | 浙江大学台州研究院 | Breathing and heart stroke combined monitoring equipment |
| CN115399750A (en) * | 2022-07-25 | 2022-11-29 | 知心健(南京)科技有限公司 | Method for measuring respiratory impedance |
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Application publication date: 20151118 |