CN208017497U - The device that radio blood oxygen measures - Google Patents
The device that radio blood oxygen measures Download PDFInfo
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- CN208017497U CN208017497U CN201720598600.1U CN201720598600U CN208017497U CN 208017497 U CN208017497 U CN 208017497U CN 201720598600 U CN201720598600 U CN 201720598600U CN 208017497 U CN208017497 U CN 208017497U
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Abstract
The utility model embodiment provides a kind of device that radio blood oxygen measures comprising：Front end blood oxygen probe, the relevant photosignal of blood oxygen for acquiring patient；First RF transmit-receive circuit is electrically connected with front end blood oxygen probe, for transmitting wirelessly blood oxygen photosignal；Pulse synchronization circuit is electrically connected with pulse generating circuit and patient monitor, the time sequential pulse for acquiring patient monitor control photoelectricity LED, and time sequential pulse is sent to pulse generating circuit；Second RF transmit-receive circuit, is electrically connected with pulse generating circuit, the blood oxygen photosignal sended over by wireless communication channel for receiving the first RF transmit-receive circuit；Pulse generating circuit is electrically connected with the second RF transmit-receive circuit and pulse synchronization circuit, for receiving digitized photosignal and being converted into the pulse signal of certain frequency, while the pulse signal of the sequential export different frequency according to pulse synchronization circuit.
Description
Technical field
The device that the utility model embodiment is related to Oximetry technical field more particularly to a kind of radio blood oxygen measures.
Background technology
Multi-parameter monitor is a kind of instrument of measurement and control physiological parameters of patients, and multi-parameter monitor can face for medicine
Bed diagnosis provides important patient information can monitor the electrocardiosignal, heart rate, blood oxygen of human body in real time by various functions module
The important parameters such as saturation degree, blood pressure, respiratory rate and body temperature send out alarm 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 uses,
One end of various monitorings probes is connected on patient monitor, and an end is connected on patient body, and the physiological parameter of monitoring is more, the monitoring used
Probe is also more, and the data line for connecting patient and patient monitor is also more.This blood oxygen probe have simulation blood oxygen probe and
Digital blood oxygen probe, but no matter which kind of blood oxygen probe, performing the operation, ICU nursing etc. is in common scene, excessive data line
Very big interference and obstacle can be formed to the operation of doctor.
Flourishing for wearable medical technology in recent years, there is going out for more and more wearable Oximetry products
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, a front end blood oxygen is needed to pass
Sensor, the display composition of the wireless converting unit and a rear end of a centre, on the one hand this kind of mode framework causes entire
System it is expensive, on the one hand again be limited to operating room space limitation be difficult have the space for accommodating an independent display,
On the other hand, medical staff has got used to the observation to patient monitor and reference.If it is possible to will be existing at present wireless
Blood oxygen transducer realizes the display on patient monitor, and by tool, there are one very important meanings.
Utility model content
In view of this, one of the technical issues of the utility model embodiment is solved is to provide a kind of radio blood oxygen measurement
Device, to overcome in the prior art wireless measurement equipment can not be linked into the technological deficiency in patient monitor, reach using pass
The patient monitor of system does not change medical staff's use habit, connects oximetry data to the ready-made interface of the systems such as HIS by patient monitor
On the basis of entering, the wireless vital sign monitoring effect to patient is realized.
The utility model embodiment provides a kind of device that radio blood oxygen measures comprising：
Front end blood oxygen probe, the relevant photosignal of blood oxygen for acquiring patient；
First RF transmit-receive circuit is electrically connected with the front end blood oxygen probe, wireless for carrying out blood oxygen photosignal
It sends；
Pulse synchronization circuit is electrically connected with the pulse generating circuit and patient monitor, and photoelectricity is controlled for acquiring patient monitor
The time sequential pulse of LED, and time sequential pulse is sent to pulse generating circuit；
Second RF transmit-receive circuit is electrically connected with the pulse generating circuit, logical for receiving the first RF transmit-receive circuit
Cross the blood oxygen photosignal that wireless communication channel sends over；
Pulse generating circuit is electrically connected with second RF transmit-receive circuit and pulse synchronization circuit, for receiving number
The photosignal of change and the pulse signal for being converted into certain frequency, while according to the sequential export different frequency of pulse synchronization circuit
Pulse signal.
By above technical scheme as it can be seen that the utility model embodiment overcomes wireless measurement equipment in the prior art to connect
Enter the technological deficiency into patient monitor, reaches using traditional patient monitor, do not change medical staff's use habit, by patient monitor
On the basis of oximetry data being accessed to the ready-made interface of the systems such as HIS, realize the radio blood oxygen monitoring effect to patient.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is that some embodiments described in the utility model embodiment for those of ordinary skill in the art can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram for the device that radio blood oxygen measures in the utility model embodiment；
Fig. 2 is the schematic diagram that multi-parameter monitor carries out human body blood oxygen sampling in the utility model embodiment；
It is absorbance curves of the different blood oxygen concentrations to light that Fig. 3, which is in the utility model embodiment,；
Fig. 4 is structural representation Fig. 1 of front end blood oxygen acquisition module in the utility model embodiment；
Fig. 5 is structural representation Fig. 2 of front end blood oxygen acquisition module in the utility model embodiment；
Fig. 6 is the driving schematic diagram of two-way LED in the utility model embodiment；
Fig. 7 is time sequential pulse schematic diagram in the utility model embodiment；
Specific implementation mode
Certainly, implementing any technical solution of the utility model embodiment must be not necessarily required to that reaching above simultaneously owns
Advantage.
In order to make those skilled in the art more fully understand the technical scheme in the embodiment of the utility model, below in conjunction with this
Attached drawing in utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, shows
So, described embodiment is only the utility model embodiment a part of the embodiment, instead of all the embodiments.Based on this reality
The every other embodiment obtained with the embodiment in new embodiment, those of ordinary skill in the art should all belong to this
The range of utility model embodiment protection.
Further illustrate that the utility model embodiment implements with reference to the utility model embodiment attached drawing.
The device that radio blood oxygen in the present embodiment measures includes：
Front end blood oxygen probe, the relevant photosignal of blood oxygen for acquiring patient；
First RF transmit-receive circuit is electrically connected with the front end blood oxygen probe, wireless for carrying out blood oxygen photosignal
It sends；
Pulse synchronization circuit is electrically connected with the pulse generating circuit and patient monitor, and photoelectricity is controlled for acquiring patient monitor
The time sequential pulse of LED, and time sequential pulse is sent to pulse generating circuit；
Second RF transmit-receive circuit is electrically connected with the pulse generating circuit, logical for receiving the first RF transmit-receive circuit
Cross the blood oxygen photosignal that wireless communication channel sends over；
Pulse generating circuit is electrically connected with second RF transmit-receive circuit and pulse synchronization circuit, for receiving number
The photosignal of change and the pulse signal for being converted into certain frequency, while according to the sequential export different frequency of pulse synchronization circuit
Pulse signal.
Fig. 1 is the structural schematic diagram for the device that radio blood oxygen measures in the utility model embodiment；As shown in Figure 1, it is wrapped
It includes：Front end blood oxygen acquisition module 102, backend pulse output module 103, the backend pulse output module 103 pass through connecting line
Cable 104 is attached with multi-parameter monitor 105.Wherein：
The front end blood oxygen acquisition module 102 specifically includes：Front end blood oxygen probe, the blood oxygen for acquiring patient are relevant
Photosignal, in the present embodiment, for the blood oxygen probe used for Analogue probe, photosignal that simulation blood oxygen probe receives can be with
The current signal of simulation is converted to, in other embodiments of the invention then believes the pulse that photoelectric signal transformation is certain frequency
Number；First RF transmit-receive circuit, for transmitting wirelessly digitized photosignal, specifically by its digitized optical telecommunications
Number backend pulse output module 103 is sent to by wireless communication channel.
The backend pulse output module 103 specifically includes：Pulse synchronization circuit controls photoelectricity for acquiring patient monitor
The time sequential pulse of LED；Second RF transmit-receive circuit is transmitted across for receiving the first RF transmit-receive circuit by wireless communication channel
The digitized photosignal come；Pulse generating circuit, for receiving digitized photosignal and being converted to certain frequency
Pulse signal, while the pulse signal of the sequential export different frequency according to pulse synchronization circuit, pass through connection by pulse signal
Cable 104 is input in multi-parameter monitor 105.
In the present embodiment, front end blood oxygen acquisition module and backend pulse output module have synchronizing function, work as backend pulse
Output module measures the sample rate of multi-parameter monitor and is communicated later with front end blood oxygen acquisition module so that front end blood oxygen acquires
The sample rate and multi-parameter monitor sample rate of module are consistent.When multi-parameter monitor and blood oxygen front end acquisition module are to people
When body carries out Oximetry, it all can obtain optical signal with some fixed sample rate and be again incident on photoelectric receiving tube by human body
After obtain electric signal, in this case, backend pulse output module must just have test multi-parameter monitor blood oxygen
The function of sample rate, while requiring the sample rate of front end blood oxygen acquisition module consistent with the blood oxygen sample rate of multi-parameter monitor,
To effectively restore original frequency signal.
As shown in Fig. 2, using the multi-parameter monitor of Koeman in the present embodiment, the patient monitor is with the sampling of 125Hz
Rate carries out blood oxygen sampling to human body, and in each sampling period (8ms), multi-parameter monitor needs exist according to the sequential in such as figure
The moment of solid black lines rising edge respectively samples 1 transmission of infrared light, ambient light, the transmission of infrared light 2, ambient light.4 are adopted
Sampling point as a complete cycle be 8ms.So front end blood oxygen acquisition module just adopts human body according to the period distances of 8ms
Sample, the sample rate both to ensure are consistent.
The principle that blood oxygen signal measures at present is mainly as follows：
The oxygen that human body is consumed is mainly derived from hemoglobin, and (there are four kinds of hemoglobins in normal blood：Oxygen closes
Hemoglobin (Hb02), reduced hemoglobin (Hb), carbonyl haemoglobin (CoHb), ferrihemoglobin (MetHb).Wherein with
What oxygen did invertibity combination is reduced hemoglobin, and what is be not combined with oxygen is carbonyl haemoglobin and siderosis red eggs
In vain.) entrained by oxygen.Oxygen content refers to the number of oxyhemoglobin in blood commonly referred to as in blood, with blood oxygen saturation this
A physical quantity describes the variation of oxygen content in blood.Basic research shows oxyhemoglobin and removes oxyhemoglobin pair
Different wave length incident light has different absorptivities, as shown in figure 3, being absorbance curves of the different blood oxygen concentrations to light.And
Its hetero-organization such as integumentary musculature, bone, venous blood is invariable to the absorption of light.It is shone when with the light of two kinds of specific wavelengths
When penetrating tissue, the formula of arterial oxygen saturation can be released with bright rich Beer law and according to the definition of blood oxygen saturation.
In the present embodiment, front end blood oxygen probe is selected as simulation blood oxygen probe, if Fig. 4 is the photoelectric signal collection to blood oxygen
The front end blood oxygen acquisition module of analog current signal, Rx is the photoelectric receiving tube for receiving the light after human body in figure, follow-up electricity
Road is the circuit for handling the photo-signal of photoelectric receiving tube.Specifically, as shown in Figure 4 comprising Rx, as photoelectricity
Reception pipe；Cf, Rf and OP1 composition electric current turn voltage amplifier circuit, and the electric current at photodiode both ends is converted to differential amplification
Voltage, Ri, Rg and OP2 amplifier form secondary voltage amplifying circuit.
The process of its work is as follows：
The photoelectric current that photoelectric receiving tube generates is smaller, forms voltage signal in the one end OP1 by Rf, this grade of circuit is main
It realizes the conversion from current signal to voltage signal, while Cf and Rf form certain filter network, the noise outside band can be produced
Raw certain limitation, this grade of amplifier major requirement noise is relatively low, to not influence the signal-to-noise ratio of original signal.Ri, Rg and OP2
Amplifier composition secondary voltage amplifying circuit be mainly used for by prime electric current turn potential circuit generation weak voltage signals into
Row amplification, generates signal VDIFF so that output signal VDIFF voltage ranges meet the input voltage range of rear class ADC, simultaneously
Rg is the variable digital regulation resistance of resistance value, the gain of second level amplifying circuit can be adjusted by adjusting the value of Rg, to change
The voltage magnitude of output signal.
I=I0e-ε(λ)cd (1)
Wherein IoFor light intensity of incident light, ε (λ) is the absorptivity of light absorbing medium, and c is the concentration of medium and d is that light is worn
The length distance of medium is crossed, I is reflected light light intensity
In formula (2), T is transmission, then can be obtained by the absorption coefficient of light A in following equation from (2) deformation：
A=-ln (T)=ε (λ) cd (3)
After light beam is by light absorbing medium, light intensity can change, and the absorptivity A after variation is Δ A, if it is assumed that
Two-beam by medium it is the same, and stroke is equal, and light passes through the length distance Δ d of medium equal, can eliminate, then not
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 generations
Table is infrared light, αPIndicate the absorbance of pulse.
The ratio of two kinds of light in formula (4) be defined as Ros that is,
So the two-beam of different wave length is by the transmission coefficient Δ T changed after medium
It can be obtained from formula (3) by obtaining natural logrithm, transmission coefficient can be obtained, then Δ T can be changed
It is written as：
So the transmission coefficient that do not share the same light from two kinds can obtain two kinds of light relevant light absorption ratio coefficients R os mutually,
I.e.
It is obtained so the coefficient of final blood oxygen concentration can be fitted from values of the Ros under different blood oxygen concentrations.
In another embodiment of the invention, what blood oxygen probe selected is the blood oxygen probe of pulse output, the blood oxygen probe
It can be according to the pulse signal of the strong and weak output different frequency of the reception light intensity of photoelectric receiving tube, if Fig. 5 is the photoelectricity arteries and veins to blood oxygen
The front end blood oxygen acquisition module of signal acquisition is rushed, photoelectric receiving tube receives the light after human body, subsequent frequencies conversion in figure
Circuit converts optical signals into the pulse signal of different frequency, is finally handled by MCU receptions.The principle process of its work is the same as 4 classes
Seemingly, only represent photosignal intensity here is the pulse signal of different frequency, and Fig. 5 be with the size of current signal come
The intensity of photosignal is represented, function is identical, repeats no more.
Specifically, in the present embodiment, the principle of the multi-parameter monitor acquisition blood oxygen signal of Koeman is in the present invention
Another embodiment in Oximetry principle it is identical, multi-parameter monitor determines that photoelectricity connects by detecting the frequency of pulse
The size for the photoelectricity intensity that closed tube receives, and then do the calculating of blood oxygen pulse frequency.Therefore, it is necessary to subsequent pulse generating circuits to send out
The pulse of different frequency is to carry out Interface Matching.
Specifically, in the present embodiment, which is characterized in that the front end blood oxygen probe includes that photoemission cell and photoelectricity connect
Closed tube, photoemission cell are used for emitting the optical signals of multiple and different wavelength, photoelectric receiving tube for receive by human vas it
Rear optical signal is simultaneously converted to corresponding electric signal, while blood oxygen probe passes through connector and the connection of the first RF transmit-receive circuit.
In current wireless survey blood oxygen product, front end blood oxygen probe is all fixed together with back-end circuit, in practical application, blood oxygen
Probe belongs to rapid wear and the bigger component of temperature drift, while the directly fixed mode of blood oxygen probe and back-end circuit also connects photoelectricity
The sensitivity of closed tube and photoemission cell has an impact.By way of connector connection, blood oxygen probe and rear end electricity are realized
The convertibility on road, easily replacing performance greatly reduces the replacement cost of equipment, while improving the stability of blood oxygen probe.
Specifically, in the present embodiment, in order to measure the blood oxygen signal of human body, light that front end blood oxygen acquisition module is sent
For double infrared lights, the wavelength of the double infrared lights intermittence during oxygen saturation monitor changes.Pass through double infrared waves
Long variation, to improve the accuracy of oxygen saturation monitor, for example wavelength is 660nm and 905nm.As shown in Fig. 2, 660nm and
The two beam infrared lights of 905nm in solid black lines rising edge moment opening, closing, are opened, 660nm respectively so as to form 660nm
It closes, 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, to reduce the overall power of the front end blood oxygen acquisition module.Under normal conditions, the front end blood oxygen acquisition module is made
For wearable device, power consumption is a very important index, and for this module, the major part of power dissipation ratio is just
It is the transmitting power consumption of infrared light, therefore, the duty ratio opened by reducing LED contributes to the work(for greatly reducing entire module
Consumption.
The pulse synchronization circuit is used to acquire the time sequential pulse of multi-parameter monitor control photoelectricity LED, the pulse sequence
As shown in Fig. 2, four different states are obtained according to the LED switch state of two different wave lengths, to obtain 4 pulses
Synchronizing signal.
Second RF transmit-receive circuit is used to receive the front end blood oxygen acquisition module by transmitting wirelessly the number to come
Word photosignal contains collected four different conditions of the front end blood oxygen acquisition module in digital photoelectric signal
Current value (wavelength 1 is opened, wavelength 1 is closed, wavelength 2 is opened, wavelength 2 is closed).The pulse generating circuit is for receiving number
The photosignal of change and the pulse signal for being converted to certain frequency, while according to the sequential export different frequency of pulse synchronization circuit
Pulse signal, i.e., what the lock-out pulse rising edge moment opened in wavelength 1 opened the collected wavelength of front end acquisition module 1
Output of pulse signal, the lock-out pulse rising edge moment closed in wavelength 1 close the collected wavelength of front end blood oxygen acquisition module 1
The output of pulse signal closed, continues successively, and front end blood oxygen is acquired mould until the lock-out pulse rising edge moment closed in wavelength 2
The output of pulse signal that the collected wavelength 2 of block is closed.It so it is 1 period, then each period will according to same sequential
On output of pulse signal to multi-parameter monitor.
Specifically, in the present embodiment, a certain node and ground wire or two-way LED in the comparison circuit of the impulsive synchronization
One end is connected, and is measured altogether to realize.Specific in the present embodiment, in Fig. 6, two-way LED is driven by patient monitor
Dynamic, the left node right node either shielding earth of LED can be by being connected to pulse synchronization circuit
On some fixed level on come be grounded measure, in the present embodiment, by the way that left node is connected to the pulse
The function is realized in power ground on synchronous circuit.
Specifically, in the present embodiment, the pulse synchronization circuit, by detecting 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, which is launch wavelength,
Infrared light LED, DP2 be launch wavelength be 905nm infrared light LED, right end LED Driver are the drivings of patient monitor
Circuit, on the contrary, when the driving current of driving circuit is forward direction (electric current flows to right end from left), DP1 starts in the direction of two LED
It shines, the voltage at the entire both ends LED is positive voltage, and when the driving current of driving circuit is reversed, (electric current is left from right flow direction
End), DP2 starts to shine, and the voltage at the entire both ends LED is negative voltage, when DP1 and DP2 is closed, the electricity at the both ends LED
Pressure is 0.Therefore, the positive and negative of the voltage at the both ends LED is either detected, according further to the positive and negative of the electric current for flowing through LED, can be sentenced
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. 7, the first row is as infrared
The sequential that light 1 (infrared light of such as aforementioned 660nm) is opened, third behavior infrared light 2 (such as infrared light of aforementioned 905nm) is opened
Sequential, the second row and fourth line do not have meaning.To using the two time sequential pulses as the sequential of subsequent current output circuit
Standard.
Specifically, in the present embodiment, the pulse generating circuit includes pwm circuit, according to pulse synchronization circuit come defeated
Go out the pulse signal of different frequency, the pwm circuit is to export different frequency in real time according to the optical signal received by MCU
Pwm signal identifies acquisition for multi-parameter monitor.The digital blood oxygen acquisition of multi-parameter monitor is the optical telecommunications that will be received
Number be converted into the pulse signal of certain frequency, then calculate the related data of blood oxygen further according to these pulse signals, principle and
The optical frequency conversion of front end blood oxygen acquisition module is identical.
Specifically, in the present embodiment, the pwm circuit generates synchronous frequency signal, is adopted for multi-parameter monitor
Collection uses.Meet the electric requirement for the multi-parameter monitor mentioned before.
Finally it should be noted that：Above example is only to illustrate the technical solution of the embodiment of the present application, rather than limits it
System；Although the application is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its
Still can be with technical scheme described in the above embodiments is modified, or which part technical characteristic is equal
It replaces；And these modifications or replacements, each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution
Spirit and scope.
Claims (10)
1. the device that a kind of radio blood oxygen measures, which is characterized in that including：
Front end blood oxygen probe, the relevant photosignal of blood oxygen for acquiring patient；
First RF transmit-receive circuit is electrically connected with the front end blood oxygen probe, for transmitting wirelessly blood oxygen photosignal；
Pulse synchronization circuit is electrically connected with pulse generating circuit and patient monitor, the sequential for acquiring patient monitor control photoelectricity LED
Pulse, and time sequential pulse is sent to pulse generating circuit；
Second RF transmit-receive circuit is electrically connected with the pulse generating circuit, passes through nothing for receiving the first RF transmit-receive circuit
The blood oxygen photosignal that line communication channel sends over；
Pulse generating circuit is electrically connected with second RF transmit-receive circuit and pulse synchronization circuit, digitized for receiving
Photosignal and the pulse signal for being converted into certain frequency, while the arteries and veins of the sequential export different frequency according to pulse synchronization circuit
Rush signal.
2. the device that radio blood oxygen according to claim 1 measures, which is characterized in that the front end blood oxygen probe output light
Electric signal is the pulse signal of different frequency, and the frequency representative of pulse signal receives the intensity of photosignal.
3. the device that radio blood oxygen according to claim 1 measures, which is characterized in that the front end blood oxygen probe output light
Electric signal is analog current signal, and the size of current signal represents the intensity for receiving photosignal.
4. the device that radio blood oxygen according to claim 2 or 3 measures, which is characterized in that the blood oxygen photosignal
Sample rate and pulse synchronization circuit pulse frequency it is consistent.
5. the device that radio blood oxygen according to claim 1 measures, which is characterized in that the blood oxygen probe sends for photoelectricity
With the combination of reception pipe, it is connected on first RF transmit-receive circuit by connector.
6. the device that radio blood oxygen according to claim 5 measures, which is characterized in that the photoemission of the blood oxygen probe
The turn-off time of pipe is the 2 times or more of opening time.
7. the device that radio blood oxygen according to claim 1 measures, which is characterized in that the pulse synchronization circuit include than
Compared with circuit and two-way LED, the two-way LED is used to provide circuit to the photoemission circuit of patient monitor, and the comparison circuit is used
In the current or voltage for measuring photoemission cell both ends, positive and negative according to current or voltage extracts the control photoelectricity LED's
Multiple time sequential pulses.
8. the device that radio blood oxygen according to claim 7 measures, which is characterized in that the comparison circuit of the impulsive synchronization
In a node be connected with one end of the two-way LED, with realize measure altogether.
9. the device that radio blood oxygen according to claim 7 measures, which is characterized in that the pulse synchronization circuit totally
Point is connected with the shielding earth of patient monitor blood oxygen input terminal.
10. the device that radio blood oxygen according to claim 1 measures, which is characterized in that the pulse generating circuit includes
Pwm circuit, according to pulse synchronization circuit come the adjustable pulse signal of output frequency.
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| CN107049334A (en) * | 2017-05-26 | 2017-08-18 | 铂元智能科技(北京)有限公司 | The device of radio blood oxygen measurement |
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