CN106859667B - Wireless blood oxygen measuring device - Google Patents
Wireless blood oxygen measuring device Download PDFInfo
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- CN106859667B CN106859667B CN201710132636.5A CN201710132636A CN106859667B CN 106859667 B CN106859667 B CN 106859667B CN 201710132636 A CN201710132636 A CN 201710132636A CN 106859667 B CN106859667 B CN 106859667B
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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
Abstract
The embodiment of the invention provides a wireless blood oxygen measuring device, which comprises: the blood oxygen collecting device comprises a front-end blood oxygen collecting module and a rear-end current output module, wherein the front-end blood oxygen collecting module is used for collecting photoelectric signals related to the blood oxygen of a patient, then digitally processing the photoelectric signals and transmitting the photoelectric signals through a wireless communication channel; the rear-end current output module is used for receiving the digitized photoelectric signals through the wireless communication channel and converting the digitized photoelectric signal data into analog electric signals which can be received by the monitor.
Description
Technical Field
The embodiment of the invention relates to the technical field of blood oxygen measurement, in particular to a wireless blood oxygen measuring device.
Background
The multi-parameter monitor is an instrument for measuring and controlling physiological parameters of patients, can provide important patient information for medical clinical diagnosis, can monitor important parameters of human bodies such as electrocardiosignals, heart rate, oxyhemoglobin saturation, blood pressure, respiratory rate, body temperature and the like in real time through various functional modules, and can give an alarm if exceeding standards occurs.
The existing monitor adopts a wired connection mode, namely, the monitoring of various physiological parameters of a patient is realized, one end of each monitoring probe is connected to the monitor, the other end is connected to the body of the patient, the more the monitored physiological parameters are, the more the monitoring probes are used, and the more data lines for connecting the patient and the monitor are. Especially in the common situations of operation, ICU nursing and the like, too many data lines can cause great interference and obstacles to the operation of the doctor.
The technology is more and more mature, but the application is mainly applicable to family scenes, the application to professional medical scenes is very little, the main limitation is that the current application mode is an independent system, the wireless blood oxygen pulse monitor needs a front-end blood oxygen pulse sensor, a middle wireless switching unit and a rear-end display, the mode structure leads to high cost of the whole system, the mode structure is limited by the space limitation of an operating room and is difficult to have a space for accommodating a single display, and medical personnel are used for observing and referring to the monitor. Therefore, it is very important to realize the display of the wireless pulse oximetry monitoring on the monitor.
Disclosure of Invention
In view of the above, one of the technical problems solved by the embodiments of the present invention is to provide a wireless blood oxygen measuring device, so as to overcome the technical defect that the wireless measuring device in the prior art cannot be connected to the monitor, so as to achieve the effect of monitoring the wireless vital signs of the patient by using the traditional monitor without changing the use habit of the medical care personnel and accessing the blood oxygen data through the existing interfaces of the monitor to the HIS system.
The embodiment of the invention provides a wireless blood oxygen measuring device, which comprises: a front-end blood oxygen collecting module, a rear-end current output module,
the front-end blood oxygen acquisition module is used for acquiring photoelectric signals related to the blood oxygen of a patient, then carrying out digital processing on the photoelectric signals and transmitting the photoelectric signals through a wireless communication channel;
the rear-end current output module is used for receiving the digitized photoelectric signals through the wireless communication channel and converting the digitized photoelectric signal data into analog electric signals which can be received by the monitor.
Optionally, in an embodiment of the present invention, when the front-end blood oxygen collecting module digitizes the photoelectric signal, the ID with the uniqueness of the photoelectric signal and the digitized photoelectric signal are sent together through a wireless communication channel.
Optionally, in an embodiment of the present invention, the back-end current output module communicates with the front-end blood oxygen collecting module after measuring the sampling rate of the monitor, so that the sampling rate of the front-end blood oxygen collecting module and the monitor sampling rate are kept consistent.
Optionally, in an embodiment of the present invention, the front-end blood oxygen collecting module includes a front-end blood oxygen probe, an AD converting unit, and a radio frequency transceiver circuit, where the front-end blood oxygen probe is configured to collect an optoelectronic signal related to blood oxygen of a patient, the AD converting unit is configured to digitize the optoelectronic signal, and the radio frequency transceiver circuit is configured to wirelessly transmit the digitized optoelectronic signal.
Optionally, in an embodiment of the present invention, the front-end blood oxygen probe includes a photo-electric transmitting tube and a photo-electric receiving tube, the photo-electric transmitting tube is used for transmitting a plurality of optical signals with different wavelengths, and the photo-electric receiving tube is used for receiving the optical signals after passing through the blood vessels of the human body and converting the optical signals into corresponding photo-electric signals.
Optionally, in an embodiment of the present invention, the off time of the photoemissive tube of the front-end blood oxygen probe is more than 2 times of the on time.
Optionally, in an embodiment of the present invention, the back-end current output module includes a pulse synchronization circuit, a radio frequency transceiver circuit, and a current generating circuit, the pulse synchronization circuit is configured to acquire a timing pulse of the monitor controlling the photoelectric LED, the radio frequency transceiver circuit is configured to receive a digitized photoelectric signal sent by the front-end blood oxygen acquisition module through the wireless communication channel, and the current generating circuit is configured to receive the digitized photoelectric signal and restore the digitized photoelectric signal to an analog current signal, and output a current signal with a predetermined wavelength at a predetermined time according to a timing sequence of the pulse synchronization circuit.
Optionally, in an embodiment of the present invention, the pulse synchronization circuit extracts a plurality of timing pulses for controlling the photo LED by detecting positive and negative currents at the blood oxygen connection terminals of the monitor.
Optionally, in an embodiment of the present invention, the pulse synchronization circuit is to implement common ground measurement with the oximetry and driving circuit inside the monitor.
Optionally, in an embodiment of the present invention, the current generating circuit includes a DA converting circuit and a current source, the DA converting circuit is configured to convert the digitized photoelectric signal into an analog electrical signal, and the current source converts the analog electrical signal into an analog current signal meeting the electrical requirement of the monitor.
Optionally, in an embodiment of the present invention, the current source includes a photovoltaic optocoupler, one end of which is isolated from the front-end circuit, and the other end of which monitors the current input of the monitor.
Optionally, in an embodiment of the present invention, an input portion of the photovoltaic optocoupler is driven by a current source.
As can be seen from the above technical solutions, in the embodiments of the present invention, the front-end blood oxygen collecting module is used for collecting photoelectric signals related to blood oxygen of a patient, and then the photoelectric signals are digitally processed and transmitted through a wireless communication channel; the rear-end current output module is used for receiving digitized photoelectric signals through the wireless communication channel and converting the digitized photoelectric signal data into analog electric signals capable of being received by the monitor, so that the purpose of utilizing the traditional monitor is achieved, the use habit of medical personnel is not changed, and the wireless vital sign monitoring effect on a patient is achieved on the basis that blood oxygen data are accessed by means of ready-made interfaces of the monitor to systems such as HIS (medical science information system) and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present invention, and it is also possible for a person skilled in the art to obtain other drawings based on the drawings.
FIG. 1 is a schematic view illustrating a wireless blood oxygen measuring device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a multi-parameter monitor according to a second embodiment of the present invention for sampling a photo-electric signal related to blood oxygen of a human body;
FIG. 3 is a graph showing the absorption rate of light for different blood oxygen concentrations in accordance with a third embodiment of the present invention;
FIG. 4 is a schematic diagram of a front end blood oxygen collection module according to a fourth embodiment of the present invention;
fig. 5 is a schematic diagram illustrating driving of a bidirectional LED according to a fifth embodiment of the present invention;
FIG. 6 is a schematic diagram of timing pulses in a sixth embodiment of the present invention;
fig. 7 is an IV characteristic curve of a photovoltaic optocoupler in the seventh embodiment of the invention.
Detailed Description
Of course, it is not necessary for any particular embodiment of the invention to achieve all of the above advantages at the same time.
In order to make those skilled in the art better understand the technical solutions in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention shall fall within the scope of the protection of the embodiments of the present invention.
The following further describes specific implementation of the embodiments of the present invention with reference to the drawings.
In the following embodiments of the present invention, a wireless blood oxygen continuous monitor comprises: the blood oxygen collecting device comprises a front-end blood oxygen collecting module and a rear-end current output module, wherein the front-end blood oxygen collecting module is used for collecting photoelectric signals related to the blood oxygen of a patient, then digitally processing the photoelectric signals and transmitting the photoelectric signals through a wireless communication channel; the rear-end current output module is used for receiving the digitized photoelectric signals through the wireless communication channel and converting the digitized photoelectric signal data into analog electric signals which can be received by the monitor.
FIG. 1 is a schematic view illustrating a wireless blood oxygen measuring device according to an embodiment of the present invention; as shown in fig. 1, it includes: the blood oxygen monitoring system comprises a front-end blood oxygen acquisition module 102 and a rear-end current output module 103, wherein the rear-end current output module 103 is connected with a multi-parameter monitor 105 through a connecting cable 104. Wherein:
the front-end blood oxygen acquisition module 102 is used for acquiring photoelectric signals related to blood oxygen of a patient, digitalizing the photoelectric signals to form digitalized photoelectric signals and transmitting the digitalized photoelectric signals to the rear-end current output module 103 through a wireless communication channel, and the rear-end current output module 103 restores and simulates the digitalized photoelectric signals according to the received digitalized photoelectric signals, outputs current signals meeting the electrical requirements of the multi-parameter monitor, and then inputs the current signals into the multi-parameter monitor 105 through the connecting cable 104.
In this embodiment, when the front-end blood oxygen collecting module digitizes the analog photoelectric signal, the ID with its uniqueness and the digitized photoelectric signal are sent together through the wireless communication channel.
The physical layer of the wireless communication channel adopts a Wifi signal, according to the protocol of the Wifi signal, when the front-end blood oxygen acquisition module and the rear-end current output module are connected each time, the rear-end current output module automatically acquires the MAC address (representing the unique ID of the rear-end current output module) of the front-end blood oxygen acquisition module, and whether the automatic identification data is sent from the acquisition module corresponding to the MAC address or not is automatically identified when the data is read each time, so that the validity and the order of the signals are ensured.
In this embodiment, the front end blood oxygen collecting module and the rear end current output module have a synchronization function, and communicate with the front end blood oxygen collecting module after the rear end current output module measures the sampling rate of the multi-parameter monitor, so that the sampling rate of the front end blood oxygen collecting module and the sampling rate of the multi-parameter monitor are kept consistent. When the multi-parameter monitor and the front-end blood oxygen collecting module are used for measuring the blood oxygen of a human body, the optical signals are obtained at a certain fixed sampling rate, and then the optical signals are transmitted to the photoelectric receiving tube to obtain electric signals.
As shown in fig. 2, in this embodiment, the multi-parameter monitor samples the photoelectric signal related to blood oxygen of the human body at a sampling rate of 125Hz, and in each sampling period (8ms), the multi-parameter monitor needs to sample the infrared light 1 transmission, the ambient light, the infrared light 2 transmission, and the ambient light respectively at the moment of the four level rising edges from top to bottom according to the timing sequence shown in the figure. Every 4 samples is 8ms as a whole period. The front-end blood oxygen collecting module samples the human body according to the periodic interval of 8ms, thereby ensuring that the sampling rates of the front-end blood oxygen collecting module and the human body are consistent.
In this embodiment, the principle of collecting the photoelectric signal related to blood oxygen by the front-end blood oxygen collecting module is as follows:
since oxygen consumed by the human body is mainly derived from oxygen carried by hemoglobin (four kinds of hemoglobin exist in normal blood: oxygenated hemoglobin (HbO2), reduced hemoglobin (Hb), carboxyhemoglobin (CoHb), methemoglobin (MetHb).) wherein reversibly bound to oxygen is reduced hemoglobin and unbound to oxygen is carboxyhemoglobin and methemoglobin). Generally, the oxygen content in blood refers to the amount of oxyhemoglobin in blood, and the physical quantity of blood oxygen saturation is used to describe the change of the oxygen content in blood. Oxyhemoglobin and deoxyhemoglobin have different absorptances for different wavelengths of incident light, as shown in fig. 3, which is a graph of absorptance of different blood oxygen concentrations versus light. And the absorption of light by other tissues such as skin muscle, bone, venous blood and the like is constant. When the tissue is irradiated by the light with two specific wavelengths, the formula of the arterial oxygen saturation can be deduced according to the definition of the blood oxygen saturation by applying the Lambert-beer law.
Fig. 4 is a front-end blood oxygen collecting module for collecting photoelectric signals of blood oxygen, in the figure, Cpd is a photoelectric receiving tube for receiving light after passing through a human body, and the subsequent circuit is a circuit for processing a photoelectric signal of the photoelectric receiving tube. Specifically, as shown in fig. 4, Rx is included, i.e. the photo-receiving tube; cf. Rf and OP1 form a current-to-voltage amplifying circuit, the current at two ends of the photodiode is converted into differential amplifying voltage, and Ri, Rg and OP2 amplifiers form a secondary voltage amplifying circuit; the working process is as follows:
the photoelectric current generated by the photoelectric receiving tube is small, a voltage signal is formed at one end of OP1 through Rf, the stage circuit mainly realizes the conversion from the current signal to the voltage signal, meanwhile, Cf and Rf form a certain filter network, certain limitation can be generated on out-of-band noise, and the stage operational amplifier mainly requires low noise so as not to influence the signal-to-noise ratio of the original signal. The secondary voltage amplifying circuit composed of Ri, Rg and OP2 amplifiers is mainly used for amplifying a weak voltage signal generated by the front-stage current-to-voltage circuit to generate a signal VDIFFSo that the output signal V isDIFFThe voltage range meets the voltage input range of the rear-stage ADC, meanwhile, the Rg is a digital potentiometer with variable resistance, and the gain of the second-stage amplifying circuit can be adjusted by adjusting the value of the Rg, so that the voltage amplitude of the output signal is changed.
I＝I0e-s(λ)cd (1)
Where Io is the intensity of incident light, (λ) is the absorption coefficient of the light-absorbing medium, c is the concentration of the medium and d is the length distance of light passing through the medium, and I is the intensity of reflected light
In the formula (2), T is transmittance, and the light absorption coefficient a in the following formula can be obtained from the deformation of (2):
A＝-ln(T)＝(λ)cd (3)
after a beam of light passes through the light-absorbing medium, the light intensity will change, and the changed absorption coefficient a is Δ a, if it is assumed that the two beams of light pass through the same medium and have equal strokes, and the length distance Δ d of the light passing through the medium is equal, the ratio of the absorption coefficients of the red light and the infrared light with different wavelengths can be eliminated as follows:
wherein R represents red light (red light can be another infrared light with different wavelength from the infrared light), IR represents infrared light, and alphaPRepresents the absorbance of the pulse.
The ratio of the two lights in equation (4) is defined as Ros i.e.,
the transmission coefficient DeltaT of two beams of light with different wavelengths after passing through the medium is
From equation (3), it can be derived that by taking the natural logarithm, the transmission coefficient can be obtained, and then Δ T can be rewritten as:
therefore, the light absorption ratio coefficient Ros of two lights correlated with each other, that is, the light absorption ratio coefficient Ros of two lights can be obtained from the transmission coefficients of two different lights
Therefore, the coefficients of the final blood oxygen concentration can be obtained by fitting Ros to values at different blood oxygen concentrations.
Specifically, in this embodiment, the front-end blood oxygen collecting module includes a front-end blood oxygen probe, an AD converting unit, and a radio frequency transceiver circuit. The front-end blood oxygen probe is used for converting human body blood oxygen signals into electric signals, the AD conversion unit is used for digitizing the electric signals, and the radio frequency transceiver circuit is used for wirelessly transmitting the digitized electric signals.
Specifically, in this embodiment, the front-end blood oxygen probe includes a photoelectric emission tube and a photoelectric receiving tube, the photoelectric emission tube is configured to emit a plurality of optical signals with different wavelengths, the photoelectric receiving tube is configured to receive the optical signals after passing through the blood vessels of the human body and convert the optical signals into corresponding electrical signals, and the blood oxygen probe may be connected to the front-end blood oxygen collecting module through a Molex connector.
Specifically, in this embodiment, in order to measure the blood oxygen signal of the human body, the light sent by the front-end blood oxygen collecting module is dual infrared light, and the wavelength of the dual infrared light intermittently changes during the blood oxygen monitoring. The accuracy of blood oxygen monitoring is improved by the change of the wavelength of the dual infrared light, such as 660nm and 905 nm. As shown in fig. 2, two infrared lights of 660nm and 905nm are turned on and off at the instant of blue rising edge, so as to form four states of 660nm on, 660nm off, 905nm on and 905nm off.
Specifically, in this embodiment, the off time of the photo-emission tube of the blood oxygen probe is more than 2 times of the on time, so as to reduce the overall power consumption of the front-end blood oxygen collection module. Generally, the front-end blood oxygen collection module is used as a wearable device, power consumption is a very important index, and for the module, a main part of the power consumption is the emission power consumption of infrared light, so that the power consumption of the whole module is greatly reduced by reducing the duty ratio of the LED on.
Specifically, in this embodiment, the rear-end current output module includes a pulse synchronization circuit, a radio frequency transceiver circuit, and a current generation circuit. The pulse synchronization circuit is used for collecting time sequence pulses of the multi-parameter monitor control photoelectric LED, the pulse time sequence is shown in figure 2, four different states are obtained according to the LED switch states of two different wavelengths, and therefore 4 pulse synchronization signals are obtained. The radio frequency transceiver circuit is used for receiving the digitized photoelectric signals sent by the front-end blood oxygen acquisition module in a wireless manner, and the digitized photoelectric signals contain four current values (with the wavelength 1 being on, the wavelength 1 being off, the wavelength 2 being on, and the wavelength 2 being off) in different states acquired by the front-end blood oxygen acquisition module. The current generating circuit is used for receiving the digitized photoelectric signal and reducing the digitized photoelectric signal into an analog current signal, and simultaneously outputting a current signal with a specific wavelength at a specific moment according to the time sequence of the pulse synchronizing circuit, namely outputting a current signal with the wavelength 1 being opened acquired by the front end acquisition module at the moment of the rising edge of the synchronous pulse with the wavelength 1 being opened, outputting a current signal with the wavelength 1 being closed acquired by the front end blood oxygen acquisition module at the moment of the rising edge of the synchronous pulse with the wavelength 1 being closed, and sequentially continuing until outputting a current signal with the wavelength 2 being closed, which is acquired by the front end blood oxygen acquisition module at the moment of the rising edge of the synchronous pulse with the wavelength 2 being closed. This is 1 cycle and then each cycle outputs a current signal to the multi-parameter monitor in the same timing sequence.
Specifically, in this embodiment, a certain node in the pulse-synchronized comparison circuit is connected to one end of the bidirectional LED, so as to implement common-ground measurement. Specifically, in this embodiment, as shown in fig. 5, the bidirectional LED is driven by the monitor, and the left node or the right node of the bidirectional LED can be connected to a fixed level on the pulse synchronization circuit to implement the ground measurement.
Specifically, in this embodiment, the pulse synchronization circuit extracts a plurality of timing pulses for controlling the photo LED by detecting positive and negative currents or voltages at the blood oxygen connection terminals of the monitor. As shown in fig. 5, DP1 is an LED emitting infrared light with a wavelength of 660nm, DP2 is an LED emitting infrared light with a wavelength of 905nm, right-end LED Driver is a driving circuit of the monitor, the directions of the two LEDs are opposite, when the driving current of the driving circuit is in the forward direction (current flows from left to right), DP1 starts emitting light, the voltage across the entire LED is a positive voltage, when the driving current of the driving circuit is in the reverse direction (current flows from right to left), DP2 starts emitting light, the voltage across the entire LED is a negative voltage, and when DP1 and DP2 are both off, the voltage across the LED is 0. Therefore, whether the positive and negative of the voltage across the LED are detected or the positive and negative of the current flowing through the LED are detected, the state of the LED can be determined, and the switching timing sequence of the two beams of infrared light is obtained according to the state of the LED, as shown in fig. 6, the first line is the timing sequence when the infrared light 1 is turned on, the third line is the timing sequence when the infrared light 2 is turned on, and the second line and the fourth line have no meaning. Thus, the two timing pulses are used as the timing standard of the subsequent current output circuit.
Specifically, in this embodiment, the current generating circuit includes a DA converter circuit and a current source, the DA converter circuit is configured to convert the digitized photoelectric signal into an analog electrical signal, and the current source converts the analog electrical signal into an analog current signal meeting the electrical requirements of the multi-parameter monitor. The blood oxygen collecting circuit of the multi-parameter monitor is shown in fig. 4, and the principle of the front-end collecting module is the same, the optical receiving tube of the Rx of the front end receives the optical signal of the optical transmitting tube, converts the optical signal into a current signal, and then enters the transconductance amplifying circuit for processing. Therefore, the analog signal converted by the current source must have the characteristics of a photodiode: the power supply has an energy generating function, is not dependent on other power supplies for power supply, and the output of the final current is isolated from other circuits of the rear-end current output module, and the output of the current is generally about uA level.
Specifically, in this embodiment, the core portion in the current source is a photovoltaic optocoupler, which implements isolation from the front-end circuit on the one hand and serves as a current input of the multi-parameter monitor on the other hand. I.e. meets the electrical requirements of the multi-parameter monitor mentioned before.
Specifically, in this embodiment, the input portion of the photovoltaic optocoupler is driven by a current source, so as to improve the input range of the input signal, thereby improving the signal resolution. As shown in fig. 7, in the course of the light output current changing in the full scale, the current of the front-end input diode changes between 0.3mA and 100mA, and the voltage of the front-end input diode changes between 1V and 1.4V. In the change process, the current is nonlinear along with the change of the voltage, so that if the current driving mode of the photovoltaic optocoupler is sampled, on one hand, the signal resolution is improved, and on the other hand, the nonlinearity of the rear-end current output is reduced.
Claims (8)
1. A wireless oximetry device, comprising: a front-end blood oxygen collecting module, a rear-end current output module,
the front-end blood oxygen acquisition module is used for acquiring photoelectric signals related to the blood oxygen of a patient, then carrying out digital processing on the photoelectric signals and transmitting the photoelectric signals through a wireless communication channel;
the rear-end current output module is used for receiving the digitized photoelectric signal through the wireless communication channel and converting the digitized photoelectric signal data into an analog electric signal which can be received by the monitor;
wherein the content of the first and second substances,
the rear-end current output module comprises a pulse synchronization circuit, a radio frequency transceiver circuit and a current generating circuit, wherein the pulse synchronization circuit is used for acquiring time sequence pulses of a monitor control photoelectric LED, the radio frequency transceiver circuit is used for receiving digitized photoelectric signals sent by the front-end blood oxygen acquisition module through a wireless communication channel, and the current generating circuit is used for receiving the digitized photoelectric signals and restoring the digitized photoelectric signals into analog current signals and outputting current signals with preset wavelengths at preset moments according to the time sequence of the pulse synchronization circuit;
the current generating circuit comprises a DA conversion circuit and a current source, the DA conversion circuit is used for converting a digitized photoelectric signal into an analog electric signal, and the current source is used for converting the analog electric signal into an analog current signal meeting the electrical requirement of the monitor; the current source comprises a photovoltaic optocoupler, one end of the photovoltaic optocoupler is connected with the front-end drive circuit, and the other end of the photovoltaic optocoupler is used as the current input of the monitor;
the input part of the photovoltaic optocoupler is driven by a current source; in the process that the light output current changes in a full scale, the current input by the front end of the photovoltaic optical coupler changes from 0.3mA to 100mA, and the voltage input by the front end of the photovoltaic optical coupler changes from 1V to 1.4V; and the corresponding relation between the current input at the front end of the photovoltaic optocoupler and the voltage input at the front end of the photovoltaic optocoupler is a nonlinear relation.
2. The wireless blood oxygen measuring device of claim 1, wherein the front end blood oxygen collecting module digitizes the photoelectric signal, and sends the digitized photoelectric signal and the unique ID of the front end blood oxygen collecting module together via a wireless communication channel.
3. The wireless blood oxygen measuring device according to claim 1, wherein the back end current output module communicates with the front end blood oxygen collecting module after measuring the sampling rate of the monitor, so that the sampling rate of the front end blood oxygen collecting module and the monitor sampling rate are kept consistent.
4. The wireless blood oxygen measuring device according to claim 1, wherein the front-end blood oxygen collecting module comprises a front-end blood oxygen probe, an AD conversion unit and a radio frequency transceiver circuit, the front-end blood oxygen probe is used for collecting photoelectric signals related to blood oxygen of a patient, the AD conversion unit is used for digitizing the photoelectric signals, and the radio frequency transceiver circuit is used for wirelessly transmitting the digitized photoelectric signals.
5. The wireless blood oxygen measuring device according to claim 4, wherein the front-end blood oxygen probe comprises a photo-electric transmitting tube and a photo-electric receiving tube, the photo-electric transmitting tube is used for transmitting a plurality of light signals with different wavelengths, and the photo-electric receiving tube is used for receiving the light signals after passing through the blood vessel of the human body and converting the light signals into corresponding photo-electric signals.
6. The wireless oximetry device according to claim 5, wherein the off time of the photoemissive tube of the front end oximetry probe is more than 2 times the on time.
7. The wireless oximetry device of claim 1, wherein the pulse synchronization circuit draws a plurality of timing pulses that control the photo LEDs by detecting positive and negative current or voltage at the oximetry connection terminals of the monitor.
8. The wireless oximetry device of claim 1, wherein the pulse synchronization circuit is configured to perform a common ground measurement with the oximetry and driver circuits internal to the monitor.
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