CN106859667A - Radio blood oxygen measurement apparatus - Google Patents
Radio blood oxygen measurement apparatus Download PDFInfo
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- CN106859667A CN106859667A CN201710132636.5A CN201710132636A CN106859667A CN 106859667 A CN106859667 A CN 106859667A CN 201710132636 A CN201710132636 A CN 201710132636A CN 106859667 A CN106859667 A CN 106859667A
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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
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
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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
- A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
- A61B5/0004—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network characterised by the type of physiological signal transmitted
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Abstract
The embodiment of the present invention provides a kind of radio blood oxygen measurement apparatus, and it includes：Front end blood oxygen acquisition module, back end current output module, the front end blood oxygen acquisition module are used to gather the photosignal related to the blood oxygen of patient, are then transmitted to the photosignal digitized processing and by wireless communication channel；The back end current output module is used to receive digitized photosignal by the wireless communication channel, and digital photoelectric signal data is converted to the analog electrical signal that can be received by patient monitor.
Description
Technical field
The present embodiments relate to Oximetry technical field, more particularly to a kind of radio blood oxygen measurement apparatus.
Background technology
Multi-parameter monitor is a kind of instrument for measuring and controlling physiological parameters of patients, and multi-parameter monitor can face for medical science
Bed diagnosis provides important patient information, by various functions module, can real-time monitoring human body electrocardiosignal, heart rate, blood oxygen
The important parameters such as saturation degree, blood pressure, respiratory rate and body temperature, alarm is sent if there is exceeded.
The monitoring for being all wired connection mode, i.e., realizing to the various physiological parameters of patient that existing patient monitor is used,
Various one ends of monitoring probe are connected on patient monitor, and an end is connected on patient body, and the physiological parameter of monitoring is more, the monitoring for using
Probe is also more, and the data wire of connection patient and patient monitor is also more.Especially in operation, in the conventional scene such as ICU nursing,
Excessive data wire can form very big interference and obstacle to the operation of doctor.
Flourishing for wearable medical technology in recent years, there is going out for increasing wearable oxygen saturation monitor product
Existing, technology is all more and more ripe, but the application at present is primarily adapted for use in home scenarios, for answering for professional medical scene
With very less, major limitation also resides in current application mode or an independent system, radio blood oxygen pulse monitor
Need a front end blood oxygen pulse transducer, the wireless converting unit and a display composition for rear end of centre, this kind
On the one hand mode framework causes the costly of whole system, and the space limitation that operating room is on the one hand limited to again is difficult have receiving
The space of an independent display, on the other hand, medical personnel get used to the observation and reference to patient monitor.Therefore, such as
Current existing wireless pulse oxygen saturation monitor can be realized the display on patient monitor by fruit will very important meaning.
The content of the invention
In view of this, one of technical problem that the embodiment of the present invention is solved is to provide a kind of radio blood oxygen measurement dress
Put, be used to overcome wireless measurement equipment in the prior art cannot be linked into the technological deficiency in patient monitor, reach using traditional
Patient monitor, medical personnel's use habit is not changed, by patient monitor the ready-made interface of the systems such as HIS is accessed oximetry data
On the basis of, realize the wireless vital sign monitoring effect to patient.
The embodiment of the present invention provides a kind of radio blood oxygen measurement apparatus, and it includes：Front end blood oxygen acquisition module, back end current
Output module,
The front end blood oxygen acquisition module is used to gather the photosignal related to the blood oxygen of patient, then to the photoelectricity
Signal digitized processing is simultaneously transmitted by wireless communication channel；
The back end current output module is used to receive digitized photosignal by the wireless communication channel, and will
Digital photoelectric signal data is converted to the analog electrical signal that can be received by patient monitor.
Alternatively, in one embodiment of this invention, the front end blood oxygen acquisition module enters line number to the photosignal
During word, ID and digitized photosignal with the photosignal uniqueness are sent out through wireless communication channel in the lump
Send.
Alternatively, in one embodiment of this invention, the back end current output module measures the sample rate of patient monitor
Communicated with the front end blood oxygen acquisition module later so that the sample rate and patient monitor sample rate of the front end blood oxygen acquisition module
It is consistent.
Alternatively, in one embodiment of this invention, the front end blood oxygen acquisition module includes that front end blood oxygen probe, AD turn
Unit and RF transmit-receive circuit are changed, the front end blood oxygen probe is used to gather the photosignal related to the blood oxygen of patient, described
AD conversion unit is used to be digitized photosignal, and the RF transmit-receive circuit then is used to enter digitized photosignal
Row wireless transmission.
Alternatively, in one embodiment of this invention, the front end blood oxygen probe includes photoemission cell and opto-electronic receiver
Pipe, the photoemission cell is used for launching the optical signal of multiple different wave lengths, and the photoelectric receiving tube is used to receive by human body
Optical signal after blood vessel is simultaneously converted to corresponding photosignal.
Alternatively, in one embodiment of this invention, the turn-off time of the photoemission cell of the front end blood oxygen probe be
More than 2 times of opening time.
Alternatively, in one embodiment of this invention, the back end current output module includes pulse synchronization circuit, radio frequency
Transmission circuit, current occuring circuit, the pulse synchronization circuit are used to gather the time sequential pulse of patient monitor control photoelectricity LED, institute
Stating RF transmit-receive circuit is used for the digitized photoelectricity that receiving front-end blood oxygen acquisition module is sended over by wireless communication channel
Signal, the current occuring circuit is used to receive digitized photosignal and will be reduced to analog current signal, while according to
The sequential of the pulse synchronization circuit exports the current signal of predetermined wavelength in predetermined instant.
Alternatively, in one embodiment of this invention, the pulse synchronization circuit, it passes through to detect that patient monitor blood oxygen is connected
Reversal at terminal extracts multiple time sequential pulses of control photoelectricity LED.
Alternatively, in one embodiment of this invention, the pulse synchronization circuit will be with the Oximetry inside patient monitor
Realize measuring altogether with drive circuit.
Alternatively, in one embodiment of this invention, the current occuring circuit includes DA change-over circuits and current source, institute
DA change-over circuits are stated for digitized photosignal to be converted into analog electrical signal, the current source then turns analog electrical signal
It is changed to the analog current signal for meeting patient monitor electric requirement.
Alternatively, in one embodiment of this invention, the current source includes photovoltaic type optocoupler, one end and front-end circuit
Isolation, the input of other end patient monitor electric current.
Alternatively, in one embodiment of this invention, the importation of the photovoltaic type optocoupler is the side of driven with current sources
Formula.
From above technical scheme, in the embodiment of the present invention, by the front end blood oxygen acquisition module be used for gather with
The related photosignal of the blood oxygen of patient, is then passed to the photosignal digitized processing and by wireless communication channel
It is defeated；The back end current output module is used to receive digitized photosignal by the wireless communication channel, and by numeral
Change photosignal data and be converted to and can be reached using traditional patient monitor by the analog electrical signal that patient monitor is received, do not change medical care
Librarian use custom, the ready-made interface of the systems such as HIS is accessed oximetry data by patient monitor on the basis of, realize to patient
Wireless vital sign monitoring effect.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments described in inventive embodiments, for those of ordinary skill in the art, can also obtain according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the structural representation of radio blood oxygen measurement apparatus in the embodiment of the present invention one；
Fig. 2 is that multi-parameter monitor carries out the related photosignal of blood oxygen to human body and samples in the embodiment of the present invention two
Schematic diagram；
Fig. 3 be the embodiment of the present invention three in be absorbance curves of the different blood oxygen concentrations to light；
Fig. 4 is front end blood oxygen acquisition module schematic diagram in the embodiment of the present invention four；
Fig. 5 is the driving schematic diagram of two-way LED in the embodiment of the present invention five；
Fig. 6 is time sequential pulse schematic diagram in the embodiment of the present invention six；
Fig. 7 is the IV characteristic curves of photovoltaic optocoupler in the embodiment of the present invention seven.
Specific embodiment
Certainly, any technical scheme for implementing the embodiment of the present invention must be not necessarily required to while reaching all excellent of the above
Point.
In order that those skilled in the art more fully understand the technical scheme in the embodiment of the present invention, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described to the technical scheme in the embodiment of the present invention, it is clear that described reality
It is only a part of embodiment of the embodiment of the present invention to apply example, rather than whole embodiments.Based on the implementation in the embodiment of the present invention
Example, the every other embodiment that those of ordinary skill in the art are obtained should all belong to the scope of embodiment of the present invention protection.
The embodiment of the present invention is further illustrated with reference to embodiment of the present invention accompanying drawing to implement.
In the following embodiments of the present invention, radio blood oxygen continues to monitor instrument, including：Front end blood oxygen acquisition module, back end current
Output module, the front end blood oxygen acquisition module is used to gather the photosignal related to the blood oxygen of patient, then to the light
Electric signal digitising treatment is simultaneously transmitted by wireless communication channel；The back end current output module is used for by the nothing
Line communication channel receives digitized photosignal, and digital photoelectric signal data is converted to the mould that can be received by patient monitor
Intend electric signal.
Fig. 1 is the structural representation of radio blood oxygen measurement apparatus in the embodiment of the present invention one；As shown in figure 1, it includes：Before
End blood oxygen acquisition module 102, back end current output module 103, the back end current output module 103 pass through connection cables 104
It is attached with multi-parameter monitor 105.Wherein：
The front end blood oxygen acquisition module 102 is used to gather the photosignal related to blood oxygen of patient, is digitized
Digitized photosignal is formed later and back end current output module 103, back end current are sent to by wireless communication channel
After output module 103 is according to the digitized photosignal for receiving, digitized photosignal is carried out into reduction and simulation, it is defeated
Go out to meet the current signal of multi-parameter monitor electric requirement, then current signal is input to by connection cables 104 many
In parameter patient monitor 105.
In the present embodiment, when be digitized for simulated photosignal by the front end blood oxygen acquisition module, will carry
The ID of itself uniqueness and the digital photoelectric signal are sent by wireless communication channel in the lump together.
The physical layer of wireless communication channel uses Wifi signals, according to the agreement of Wifi signals, when the front end blood oxygen is adopted
During collection module and the back end current output module are attached every time, the back end current output module is automatically obtained
The MAC Address (representing the ID of itself uniqueness) of the front end blood oxygen acquisition module, automatic identification when data are read every time
Whether data are to be sended over from the corresponding acquisition module of the MAC Address, so as to ensure the effective and orderly of signal.
In the present embodiment, the front end blood oxygen acquisition module and the back end current output module have synchronizing function, when
The sample rate that the back end current output module measures multi-parameter monitor communicates with the front end blood oxygen acquisition module later,
So that the sample rate and multi-parameter monitor sample rate of the front end blood oxygen acquisition module are consistent.When multi-parameter monitor and
When the front end blood oxygen acquisition module carries out Oximetry to human body, all optical signal can be obtained with some sample rate fixed and passed through
Cross after human body is again incident on photoelectric receiving tube and obtain electric signal, in this case, the back end current output module can
Possess test multi-parameter monitor blood oxygen sample rate function, while require the front end blood oxygen acquisition module sample rate and
The blood oxygen sample rate of multi-parameter monitor is consistent, so as to original current signal can be reduced effectively.
As shown in Fig. 2 in the present embodiment, multi-parameter monitor carries out blood oxygen correlation to human body with the sample rate of 125Hz
Photosignal is sampled, and in each sampling period (8ms), multi-parameter monitor is needed according to the sequential in such as figure, from upper
Four moments of level rising edge under are transmitted to infrared light 1 respectively, ambient light, infrared light 2 are transmitted, ambient light is adopted
Sample.Every 4 sampled points as a complete cycle be 8ms.So described front end blood oxygen acquisition module is just according to the period distances of 8ms
Human body is sampled, so that the sample rate for ensureing both is consistent.
In the present embodiment, the related photosignal principle of front end blood oxygen acquisition module collection blood oxygen is as follows：
(there are four kinds of hemoglobins in normal blood by the oxygen that human body is consumed is mainly derived from hemoglobin：
Oxyhemoglobin (HbO2), reduced hemoglobin (Hb), carbonyl haemoglobin (CoHb), ferrihemoglobin (MetHb).Its
In do that invertibity combined with oxygen is reduced hemoglobin, what is be not combined with oxygen is that carbonyl haemoglobin and high ferro are blood red
Albumen.) entrained by oxygen.Commonly referred to as in blood oxygen content be refer to blood in oxyhemoglobin number, use blood oxygen saturation
This physical quantity describes the change of oxygen content in blood.Oxyhemoglobin and go oxyhemoglobin incident to different wave length
Light has different absorptivities, as shown in figure 3, being different blood oxygen concentrations to the absorbance curves of light.And integumentary musculature, bone
Absorption of its hetero-organization such as bone, venous blood to light is invariable.When tissue is irradiated with two kinds of light of specific wavelength, fortune
The formula of arterial oxygen saturation can be released with bright rich Beer law and according to the definition of blood oxygen saturation.
If Fig. 4 is the front end blood oxygen acquisition module to the photoelectric signal collection of blood oxygen, Cpd is reception by after human body in figure
The photoelectric receiving tube of light, subsequent conditioning circuit is the circuit for being processed the photo-signal of photoelectric receiving tube.Specifically, as schemed
Shown in 4, it includes Rx, as photoelectric receiving tube；Cf, Rf and OP1 composition electric current turn voltage amplifier circuit, by photodiode two
The electric current at end is converted to differential amplified voltage, Ri, Rg and OP2 amplifier composition secondary voltage amplifying circuit；The process of its work
It is as follows：
The photoelectric current that photoelectric receiving tube is produced is smaller, and voltage signal is formed in OP1 one end by Rf, and this grade of circuit is main
Realize conversion from current signal to voltage signal, while Cf and Rf constitutes certain filter network, can to band outside noise produce
The certain limitation of life, this grade of amplifier major requirement noise than relatively low, from the signal to noise ratio without influenceing primary signal.Ri, Rg and OP2
The secondary voltage amplifying circuit of amplifier composition is mainly used in entering the weak voltage signals that prime electric current turns potential circuit generation
Row amplifies, and produces signal VDIFFSo that output signal VDIFFVoltage range meets the input voltage range of rear class ADC, while Rg is
The variable digital regulation resistance of resistance, the gain of second level amplifying circuit can be adjusted by the value for adjusting Rg, so as to change output
The voltage magnitude of signal.
I=I0e-s(λ)cd (1)
Wherein Io is light intensity of incident light, and ε (λ) is the absorptivity of light absorbing medium, and c is the concentration and d of medium for light is worn
The length distance of medium is crossed, I is reflected light light intensity
In formula (2), T is transmission, then deform the absorption coefficient of light A in can be obtained by following equation from (2)：
A=-ln (T)=ε (λ) cd (3)
When light beam is by the way that after light absorbing medium, light intensity can change, the absorptivity A after change is Δ A, if it is assumed that
The medium that two-beam passes through is the same, and stroke is equal, and light is equal through the length distance Δ d of medium, can eliminate, then no
The feux rouges of co-wavelength and the ratio absorptivity of infrared light are as follows：
What wherein R was represented is feux rouges (feux rouges can also be another infrared light with above-mentioned infrared light different wave length), IR
What is represented is infrared light, αPRepresent the absorbance of pulse.
The ratio of two kinds of light in formula (4) is defined as Ros i.e.,
So the two-beam of different wave length is by the transmission coefficient Δ T of change after medium
Can be drawn by obtaining natural logrithm from formula (3), transmission coefficient can be obtained, then Δ T can be changed
It is written as：
So, two kinds of light light absorbs ratio coefficients R os related mutually can be obtained from two kinds of transmission coefficients do not shared the same light,
I.e.
So, the coefficient of final blood oxygen concentration can be fitted from values of the Ros under different blood oxygen concentrations and obtain.
Specifically, in the present embodiment, the front end blood oxygen acquisition module include front end blood oxygen probe, AD conversion unit and
RF transmit-receive circuit.The front end blood oxygen probe is used to for human body blood oxygen signal to be converted to electric signal, and the AD conversion unit is used
It is digitized in by electric signal, the RF transmit-receive circuit is then used to be transmitted wirelessly digital signal.
Specifically, in the present embodiment, it is characterised in that the front end blood oxygen probe includes that photoemission cell and photoelectricity connect
Closed tube, photoemission cell is used for launching the optical signal of multiple different wave lengths, photoelectric receiving tube be used to receiving by human vas it
Rear optical signal is simultaneously converted to corresponding electric signal, while blood oxygen probe can be by Molex connectors and the front end blood oxygen
Acquisition module is connected.
Specifically, in the present embodiment, in order to measure the blood oxygen signal of human body, the light that front end blood oxygen acquisition module sends
It is double infrared lights, the described pair of wavelength of infrared light intermittence during oxygen saturation monitor changes.By described pair of infrared waves
Change long, so as to improve the accuracy of oxygen saturation monitor, such as wavelength is 660nm and 905nm.As shown in Fig. 2 660nm and
The two beam infrared lights of 905nm in opening of blue rising edge moment, closing, are opened so as to form 660nm respectively, 660nm is closed,
905nm is opened, 905nm closes four states.
Specifically, in the present embodiment, the turn-off time of the photoemission cell of the blood oxygen probe is 2 times of opening time
More than, so as to reduce the overall power of the front end blood oxygen acquisition module.Under normal circumstances, the front end blood oxygen acquisition module is made
It is wearable device, power consumption is a very important index, for this module, the major part of power dissipation ratio is just
It is the transmitting power consumption of infrared light, therefore, by reducing the dutycycle that LED is opened, help greatly to reduce the work(of whole module
Consumption.
Specifically, in the present embodiment, the back end current output module includes pulse synchronization circuit, radio-frequency receiving-transmitting electricity
Road, current occuring circuit.The pulse synchronization circuit is used to gather the time sequential pulse of multi-parameter monitor control photoelectricity LED, should
Pulse sequence is shown in Fig. 2, and the LED switch state according to two different wave lengths obtains four different states, so that
To 4 pulse synchronous signals.The RF transmit-receive circuit is used to receive the front end blood oxygen acquisition module by transmitting wirelessly
The digital photoelectric signal for coming, contains four differences that the front end blood oxygen acquisition module is collected in digital photoelectric signal
The current value (wavelength 1 is opened, wavelength 1 is closed, wavelength 2 is opened, wavelength 2 is closed) of state.The current occuring circuit is used to connect
Receive digital photoelectric signal and analog current signal will be reduced to, while according to the sequential of the pulse synchronization circuit when specific
The current signal of output specific wavelength is carved, i.e., the lock-out pulse rising edge moment opened in wavelength 1 gathers front end acquisition module
Current signal output that the wavelength 1 that arrives is opened, the lock-out pulse rising edge moment closed in wavelength 1 are by front end blood oxygen acquisition module
The current signal output that the wavelength 1 for collecting is closed, continued, until the lock-out pulse rising edge moment closed in wavelength 2 successively
The current signal output that the wavelength 2 that front end blood oxygen acquisition module is collected is closed.Such is 1 cycle, then each cycle
Current signal is exported onto multi-parameter monitor according to same sequential.
Specifically, in the present embodiment, one end phase of a certain node and two-way LED in the comparison circuit of the impulsive synchronization
Connection, so as to realize measuring commonly.In specific to the present embodiment, in such as Fig. 5, two-way LED is driven by patient monitor, two-way
The left node or right node of LED, can by be connected on the pulse synchronization circuit some consolidate
Determine to be grounded measurement on level, in the present embodiment, be connected on the pulse synchronization circuit by by left node
Power supply realizes the function on the ground.
Specifically, in the present embodiment, the pulse synchronization circuit, it passes through to detect at patient monitor blood oxygen connection terminal
Reversal or voltage extracting go out to control multiple time sequential pulses of photoelectricity LED.As shown in figure 5, it is 660nm that DP1 is launch wavelength
Infrared light LED, DP2 be launch wavelength be 905nm infrared light LED, right-hand member LED Driver are the drivings of patient monitor
Circuit, two LED's is in opposite direction, and when the driving current of drive circuit is forward direction (electric current flows to right-hand member from left), DP1 starts
Luminous, the voltage at whole LED two ends is positive voltage, and when the driving current of drive circuit is reverse, (electric current is left from right flow direction
End), DP2 starts to light, and the voltage at whole LED two ends is negative voltage, when DP1 and DP2 are closed, the electricity at LED two ends
Press is 0.Therefore, the either voltage at detection LED two ends is positive and negative, according further to the positive and negative of the electric current for flowing through LED, can sentence
Break and the state of LED, according to the state of LED, the switching sequence of two beam infrared lights is obtained, as shown in fig. 6, the first row is as infrared
The sequential that light 1 is opened, the third line is the sequential that infrared light 2 is opened, and the second row and fourth line do not have implication.During so as to by the two
Serial vein is rushed as the sequential standard of follow-up current output circuit.
Specifically, in the present embodiment, the current occuring circuit includes DA change-over circuits and current source, the DA conversions
Circuit is used to for digital photoelectric signal to be converted into analog electrical signal, and analog electrical signal is then converted to and meets many by the current source
The analog current signal of parameter patient monitor electric requirement.The blood oxygen Acquisition Circuit of multi-parameter monitor is as shown in Figure 4, and described
The principle of front end acquisition module sampling is identical, and the photoelectric receiving tube of the Rx of front end receives the optical signal of photoemission cell, and
Current signal is converted into, then into being processed in mutual conductance amplifying circuit.Therefore, the current source is converted
Analog signal must have the characteristic of photodiode：With energy generating function, it is independent of other power supplys and powers, last electric current
Output and other circuits of back end current output module isolated, while the output of electric current is general at uA grades or so.
Specifically, in the present embodiment, the core in the current source be photovoltaic type optocoupler, on the one hand realize with it is preceding
The isolation of terminal circuit, is on the other hand input into as multi-parameter monitor electric current.Meet the multi-parameter monitor mentioned before
Electric requirement.
Specifically, in the present embodiment, the importation of the photovoltaic type optocoupler is the mode of driven with current sources, is improved defeated
Enter the input range of signal, so as to improve signal resolution.As shown in fig. 7, be the IV characteristic curves of photovoltaic optocoupler, it is defeated in light
Go out electric current during full scale changes, the electric current of the input diode of front end changes between 0.3mA-100mA, front end
The voltage of input diode changes between 1V-1.4V.In this change procedure electric current with the change of voltage it is non-linear, because
If the electric current of this photovoltaic optocoupler drives the mode that sample rate current source drives, signal resolution is on the one hand improved, on the one hand
Reduce the non-linear of back end current output.
Claims (12)
1. a kind of radio blood oxygen measurement apparatus, it is characterised in that including：Front end blood oxygen acquisition module, back end current output module,
The front end blood oxygen acquisition module is used to gather the photosignal related to the blood oxygen of patient, then to the photosignal
Digitized processing is simultaneously transmitted by wireless communication channel；
The back end current output module is used to receive digitized photosignal by the wireless communication channel, and by numeral
Change photosignal data and be converted to the analog electrical signal that can be received by patient monitor.
2. radio blood oxygen measurement apparatus according to claim 1, it is characterised in that the front end blood oxygen acquisition module is to institute
When stating photosignal and being digitized, the ID and digitized photosignal of the front end acquisition module uniqueness will be carried in the lump
It is transmitted through wireless communication channel.
3. radio blood oxygen measurement apparatus according to claim 1, it is characterised in that the back end current output module measurement
Communicated with the front end blood oxygen acquisition module after to the sample rate of patient monitor so that the sampling of the front end blood oxygen acquisition module
Rate and patient monitor sample rate are consistent.
4. radio blood oxygen measurement apparatus according to claim 1, it is characterised in that the front end blood oxygen acquisition module includes
Front end blood oxygen probe, AD conversion unit and RF transmit-receive circuit, the front end blood oxygen probe are used to gather the blood oxygen phase with patient
The photosignal of pass, the AD conversion unit is used to be digitized photosignal, and the RF transmit-receive circuit is then used for will
Digitized photosignal is transmitted wirelessly.
5. radio blood oxygen measurement apparatus according to claim 4, it is characterised in that the front end blood oxygen probe includes photoelectricity
Transmitting tube and photoelectric receiving tube, the photoemission cell are used for launching the optical signal of multiple different wave lengths, the photoelectric receiving tube
For receiving by the optical signal after human vas and be converted to corresponding photosignal.
6. radio blood oxygen measurement apparatus according to claim 5, it is characterised in that the photoelectricity hair of the front end blood oxygen probe
The turn-off time for penetrating pipe is more than 2 times of opening time.
7. radio blood oxygen measurement apparatus according to claim 1, it is characterised in that the back end current output module includes
Pulse synchronization circuit, RF transmit-receive circuit, current occuring circuit, the pulse synchronization circuit are used to gather patient monitor control photoelectricity
The time sequential pulse of LED, the RF transmit-receive circuit is transmitted across for receiving front-end blood oxygen acquisition module by wireless communication channel
The digitized photosignal for coming, the current occuring circuit is used to receive digitized photosignal and will be reduced to simulation electricity
Stream signal, while exporting the current signal of predetermined wavelength in predetermined instant according to the sequential of the pulse synchronization circuit.
8. radio blood oxygen measurement apparatus according to claim 7, it is characterised in that the pulse synchronization circuit, it passes through
Reversal or voltage extracting at detection patient monitor blood oxygen connection terminal go out to control multiple time sequential pulses of photoelectricity LED.
9. radio blood oxygen measurement apparatus according to claim 7, it is characterised in that the pulse synchronization circuit will and be guarded
Oximetry and drive circuit inside instrument are realized measuring altogether.
10. radio blood oxygen measurement apparatus according to claim 7, it is characterised in that the current occuring circuit includes DA
Change-over circuit and current source, the DA change-over circuits are used to for digitized photosignal to be converted into analog electrical signal, the electricity
Analog electrical signal is then converted to the analog current signal for meeting patient monitor electric requirement in stream source.
11. radio blood oxygen measurement apparatus according to claim 10, it is characterised in that the current source includes photovoltaic type light
Coupling, one end is connected with front-end driven circuit, and the other end is input into as the electric current of patient monitor.
12. radio blood oxygen measurement apparatus according to claim 11, it is characterised in that the input unit of the photovoltaic type optocoupler
It is divided into the mode of driven with current sources.
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| CN109820502A (en) * | 2019-03-20 | 2019-05-31 | 安徽邵氏华艾生物医疗电子科技有限公司 | A kind of CSM module and SPHB module abnormality detection system and method |
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| CN106859667B (en) | 2020-11-24 |
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