Blood leakage monitoring device and monitoring method

Abstract

The invention provides a blood leakage monitoring device and monitoring method. The device comprises a light emitting module used for emitting detection light to a liquid storage tank; the reference receiving end is used for collecting the original light intensity of the detection light emitted by the light emitting module; the detection receiving end is used for collecting the detection light intensity of the detection light penetrating through the liquid storage tank; the control module is used for controlling the light emitting module to emit detection light, receiving the original light intensity collected by the reference receiving end and the detection light intensity collected by the detection receiving end, and analyzing the blood leakage condition based on the relative change condition between the original light intensity and the detection light intensity. The blood leakage monitoring device collects the original light intensity, analyzes the blood leakage condition based on the relative change condition between the original light intensity and the detection light intensity, and solves the problems of the change of the luminous intensity of the luminous module, the change of output signals of the reference receiving end and the detection receiving end and the like caused by temperature rise, thereby avoiding false alarm and alarm leakage. And the monitoring accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a blood leakage monitoring device and a monitoring method. Background Art

[0002] In existing blood purification equipment, the patient's blood flows out of the body through the pipeline and purification device, and then returns to the body, forming an extracorporeal circulation system. Blood purification uses the pressure between the dialyzer or filter membrane to achieve diffusion and convection. If the membrane pressure is too large and exceeds the normal range, it will cause the membrane to rupture, causing blood leakage, thereby endangering the patient's life safety.

[0003] In order to monitor this kind of blood leakage, a blood leakage monitoring device has been proposed. The existing monitoring device emits white light, which passes through a liquid storage tank filled with transparent liquid and shines on a color sensor. The color sensor tests the red, green and blue light signals in the white light, and uses the light signal measured for the first time as the monitoring reference value. The color sensor transmits the monitored signal to the control circuit: when there is blood in the liquid storage tank, the white light passing through the liquid storage tank turns into red light and shines on the color sensor. The color sensor senses the red light and outputs data to the control circuit. The control circuit compares the measured light signal with the monitoring reference value measured for the first time and sends an alarm signal.

[0004] The disadvantages of existing blood leakage monitoring technology are:

[0005] 1) The liquid storage tank structure of the existing leakage monitoring device is a Z-shaped structure. It is difficult for bubbles to enter and drain. At the same time, the water flow needs to turn in the liquid storage tank, which will cause impact and rebound, affecting the direction of the water flow and the propagation of light. In severe cases, eddy currents will form, trapping bubbles in the container and making them unable to drain, thereby affecting the sensitivity of blood leakage monitoring. At the same time, the impact and rebound of the water flow can easily cause impurities to adhere and accumulate in the liquid storage tank.

[0006] 2) In terms of electronic device selection, the existing blood leakage monitoring device uses white light as the light source and relies on the color sensor grating at the receiving end to distinguish colors. The stability is poor. At the same time, the color sensor has a small photosensitive area. When the light is refracted, the color sensor signal will become weak and cannot accurately identify blood.

[0007] 3) In terms of monitoring methods, the existing blood leakage monitoring device has only a single receiving end. When encountering interference signals, the interference signals can only be filtered out through software algorithms, and the anti-interference ability is weak. When the grease adhesion and calcification deposition in the liquid storage tank cannot be eliminated, relying solely on software algorithms cannot achieve accurate monitoring effects. Summary of the invention

[0008] In order to overcome the defects in the prior art, the present invention aims to provide a blood leakage monitoring device and a monitoring method.

[0009] In order to achieve the above-mentioned object of the present invention, the present invention provides a blood leakage monitoring device, comprising:

[0010] A light emitting module, used for emitting detection light to the liquid storage tank;

[0011] A reference receiving end, used to collect the original light intensity of the detection light emitted by the light-emitting module;

[0012] A detection receiving end, used for collecting the detection light intensity of the detection light passing through the liquid storage tank;

[0013] The control module controls the light emitting module to emit detection light, receives the original light intensity collected by the reference receiving end and the detection light intensity collected by the detection receiving end, and analyzes the blood leakage situation based on the relative change between the original light intensity and the detection light intensity.

[0014] The blood leakage monitoring device collects the original light intensity, analyzes the blood leakage situation based on the relative change between the original light intensity and the detected light intensity, solves the problems of the change of the luminous intensity of the light-emitting module caused by the temperature rise, and the change of the output signal of the reference receiving end and the detection receiving end. It has strong anti-interference ability, can effectively avoid false alarms and missed alarms, and improves the accuracy of monitoring.

[0015] In an optional solution of the blood leakage monitoring device, it also includes a plurality of reflective lenses arranged in the propagation direction of the detection light;

[0016] The reflective lens allows the detection light to irradiate the detection receiving end when there is liquid in the liquid storage tank, and deviate from the detection receiving end when there is no liquid or bubbles in the liquid storage tank.

[0017] This optional solution can determine whether there is liquid in the liquid storage tank, while also avoiding false alarms caused by bubble interference.

[0018] In an optional solution of the blood leakage monitoring device, the reference receiving end is arranged in front of the liquid storage tank and in the same direction as the vertical direction of the light emitting module, and the detection receiving end is arranged behind the liquid storage tank and in the same direction as the light emitting module.

[0019] In an optional solution of the blood leakage monitoring device, the liquid storage tank includes a high-transmittance cylindrical glass tube, which is connected to the water system, and the liquid enters from the lower end of the high-transmittance glass tube and exits from the upper end.

[0020] This optional solution allows the liquid to flow smoothly, solving the problems of impurities easily accumulating in the liquid storage tank and bubbles being difficult to discharge. At the same time, glass impurities are not easy to adhere to, and it is resistant to high and low temperature, acid and alkali corrosion, and the material is more stable, which is more guaranteed for the stability of light exposure. The glass tube uses a universal high-transparency round glass tube, which does not require special processing and can be used after being cut according to the specification size, solving the problem of complex glass tube processing and low yield rate. Because the glass tube is a universal size in the market, mass production, mature technology, and more precise circular curvature, it can better ensure the consistency and stability of the optical path.

[0021] In an optional solution of the blood leakage monitoring device, a constant current source circuit is further included, and the constant current source circuit is electrically connected to the light emitting module to provide a stable power supply to the light emitting module.

[0022] This optional solution ensures that the current of the light-emitting module is consistent when the light-emitting module emits light of different colors at different times, thereby ensuring the stability of the light source.

[0023] In an optional solution of the blood leakage monitoring device, the light emitting module is a three-color LED lamp of R, G, and B, and the control module controls the three-color LED lamp of R, G, and B to emit red light, green light, and blue light in turn;

[0024] The reference receiving end and the detection receiving end synchronously collect the original light intensity of the detection light emitted by the three-color LED lights of R, G, and B and the detection light intensity after passing through the liquid storage tank;

[0025] The control module determines whether to start monitoring blood leakage based on the slope of the G and B signals of the detection light intensity; uses the R, G, B signals of the original light intensity to proportionally compensate the R, G, B signals of the detection light intensity, calculates the detection ratio, and determines whether to issue a blood leakage alarm based on the detection ratio.

[0026] This optional solution directly uses R, G, and B three-color LED lights to poll and emit red, green, and blue light, solving the problem of poor stability or inability to accurately identify blood caused by using white light as the light source and relying on the receiving end color sensor grating to distinguish colors in the prior art.

[0027] In an optional solution of the blood leakage monitoring device, the reference receiving end and the detection receiving end each include a photodiode, the photodiode of the reference receiving end and the photodiode of the detection receiving end are electrically connected to an AD module, the AD module is electrically connected to a signal processing module, and the signal processing module is connected to a control module;

[0028] The AD module performs analog-to-digital conversion on the current signal of the photodiode at the reference receiving end and the current signal of the photodiode at the detection receiving end and sends them to the signal processing module. The signal processing module performs dynamic smoothing filtering on the current signal after the analog-to-digital conversion and sends it to the control module.

[0029] This optional solution is different from the traditional voltage collection circuit. The current collection method is more stable and has higher accuracy and resolution. The dynamic smoothing filter process filters out the electromagnetic interference signals and fluctuation signals caused by bubbles, further improving the accuracy of monitoring.

[0030] The present invention also proposes a blood leakage monitoring method, comprising the following steps:

[0031] Control the light emitting module to emit R, G, and B three-color detection light to the liquid storage tank;

[0032] Synchronously collect the original light intensity of the R, G, B three-color detection light emitted by the light-emitting module and the detection light intensity of the R, G, B three-color detection light passing through the liquid storage tank; calculate the G, B signal slope of the detection light intensity, and start monitoring blood leakage when the G, B signal slope exceeds the slope threshold;

[0033] The R, G, B signals of the original light intensity are used to proportionally compensate the R, G, B signals of the detected light intensity, and the detection ratios G / R and B / R are calculated:

[0034] Detection ratio G / R = (G 检测接收端 / R 检测接收端 )*(R 基准接收端 / G 基准接收端 );

[0035] Detection ratio B / R = (B 检测接收端 / R 检测接收端 )*(R reference receiving end / B 基准接收端 );

[0036] Among them, R 检测接收端 To detect the R signal strength at the receiving end, G 检测接收端 To detect the G signal strength at the receiving end, B 检测接收端 To detect the B signal strength at the receiving end, R 基准接收端 is the R signal strength of the reference receiving end; G 基准接收端 is the G signal strength of the reference receiving end, B 基准接收端 is the signal strength of B at the reference receiving end;

[0037] When the detection ratio G / R and the detection ratio B / R exceed their corresponding alarm ratios, a blood leakage alarm is issued.

[0038] The blood leakage monitoring method first determines whether to monitor blood leakage, avoiding false alarms caused by light scattering caused by impurities on the tube wall; then the R, G, B signal data of the original light intensity are used to proportionally compensate the R, G, B signal data of the detection light intensity, solving the problems of changes in the luminous intensity of the LED lamp and the output signal of the photodiode caused by temperature rise, thereby avoiding false alarms and missed alarms and improving the accuracy of monitoring.

[0039] Optionally, read the constant current source current data in real time and convert it into light intensity data.

[0040] When the deviation between the light intensity data and the stored light intensity data exceeds a first set threshold, the data, parameters and various thresholds are recalibrated;

[0041] When the deviation between the light intensity data and the stored light intensity data exceeds a second set threshold, the device hardware is checked and updated.

[0042] This optional solution solves the problem of light decay when the LED lamp is near the end of its service life during use. The leakage detection after light decay is inaccurate, and false alarms and missed alarms may occur. The constant current source current data is read as the light intensity data of the LED lamp, which is not affected by the medium in the glass tube and is not affected by temperature and humidity, thereby improving the monitoring accuracy.

[0043] Optionally, when no blood leakage alarm occurs and the current data fluctuation is within the allowable range, the average values ​​of the R, G, and B signals of the detection light intensity within the set time period or the set number of data are recalculated every set time interval or every time a set number of data is collected, and the alarm ratio G / R and the alarm ratio B / R are calculated based on the average values;

[0044] When a blood leakage alarm occurs before the set duration is reached or the set amount of data is not collected, or the current data fluctuation exceeds the allowable range, the data from the last calculation of the alarm ratio to the current time will be discarded, and the alarm ratio calculated last time will be used as the alarm ratio for the current detection.

[0045] This optional solution can timely correct the alarm ratio deviation caused by the accumulation of sediment on the wall of the glass tube, and can effectively avoid false alarms and missed alarms.

[0046] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0048] Figure 1 is a schematic diagram of an optical path of the first embodiment;

[0049] Figure 2 It is a schematic diagram of the structural principle of the first embodiment;

[0050] Figure 3 It is a cross-sectional view of the liquid storage tank;

[0051] Figure 4It is a schematic diagram of the detection ratio calculation process in Example 2;

[0052] Figure 5 is a schematic diagram of the ray tracing process in Embodiment 2;

[0053] Figure 6 This is a schematic diagram of the alarm ratio calculation process;

[0054] Figure 7 It is a schematic diagram of the blood leakage detection process;

[0055] Figure 8 This is a schematic diagram of the direction of light in a liquid storage tank without liquid obtained by optical simulation;

[0056] Fig. 9 This is a schematic diagram of the direction of light when the storage tank is filled with liquid obtained by optical simulation. DETAILED DESCRIPTION

[0057] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0058] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0059] Embodiment 1

[0060] like Figure 1 and Figure 2 As shown, this embodiment provides a blood leakage monitoring device, including: a light emitting module, a reference receiving end, a detection receiving end and a control module. The light emitting module is used to emit detection light to the liquid storage tank; the reference receiving end is used to collect the original light intensity of the detection light emitted by the light emitting module; the detection receiving end is used to collect the detection light intensity of the detection light passing through the liquid storage tank; the control module controls the light emitting module to emit detection light, and receives the original light intensity collected by the reference receiving end and the detection light intensity collected by the detection receiving end, and analyzes the blood leakage situation based on the relative change between the original light intensity and the detection light intensity.

[0061] In this embodiment, Figure 3 As shown, the liquid storage tank includes a high-transmittance cylindrical glass tube, which is connected to a water system. Liquid enters from the lower end of the high-transmittance glass tube, flows through a glass flow channel, and then flows out from the upper end of the high-transmittance glass tube.

[0062] The light emitting module preferably uses, but is not limited to, three-color LED lights of R, G, and B. The reference receiving end and the detection receiving end preferably use, but are not limited to, photodiodes, which can receive light of red, green, and blue wavelengths. Figure 2 As shown, the reference receiving end is arranged in front of the liquid storage tank, and in the same direction as the vertical direction of the light emitting direction of the light emitting module, and the original light intensity of the light emitting module is detected at a 90° angle, so the light of the reference receiving end is diverged by the detection light. The detection receiving end is arranged behind the liquid storage tank, in the same direction as the light emitting direction of the light emitting module, and the light intensity of the detection light after passing through the high-transmittance glass tube is obtained at an angle of 0 to obtain the detection light intensity; the light of the detection receiving end is obtained by a number of reflective lenses, and two reflective lenses are used for reflection in this embodiment. The installation angle of the light emitting module and the installation angle of the detection receiving end are designed so that when there is liquid in the liquid storage tank, the detection light can be reflected by the reflective lens and irradiate the detection receiving end. When there is no liquid in the liquid storage tank or there are bubbles, the detection light will not be reflected by the reflective lens and irradiate the detection receiving end. In this embodiment, the installation angle of the light emitting module and the installation angle of the detection receiving end are designed by optical simulation, and are achieved according to the different refractive indices of light in different media, such as Figure 8 The figure shows the direction of the time when there is no liquid in the tank. Fig. 9 Shown is the flow of light as the reservoir fills with liquid.

[0063] In order to ensure that the light source of the R, G, and B three-color LED lamps is stable when they light different colors, a constant current source circuit is used to control the R, G, and B three-color LED lamps. The constant current source circuit is connected to the power module and is powered by the power module. In addition, the power module also powers other modules and circuits. The control module sends a control signal, which is amplified by the signal amplifier circuit and sent to the LED driver. The LED driver drives the R, G, and B three-color LED lamps to poll and emit red light, green light, and blue light according to the control signal. The reference receiving end and the detection receiving end synchronously collect the original light intensity of the detection light emitted by the R, G, and B three-color LED lamps and the detection light intensity after passing through the liquid storage tank; the control module determines whether to start monitoring blood leakage according to the slope of the G and B signals of the detection light intensity; the R, G, and B signals of the original light intensity are used to proportionally compensate the R, G, and B signals of the detection light intensity, and the detection ratio is calculated. Based on the detection ratio, it is determined whether to issue a blood leakage alarm. Since both the reference receiving end and the detection receiving end are photodiodes, the original light intensity and the detection light intensity are collected in the form of electrical signals. The signal output ends of the reference receiving end and the detection receiving end are connected to the AD module. The AD module collects the current value of the photodiode of the detection receiving end and the current value of the photodiode of the detection receiving end, and converts the current value representing the original light intensity and the current value representing the detection light intensity into digital signals. The AD module is electrically connected to the signal processing module, and performs dynamic smoothing filtering on these signals and converts them into RGB signals according to the timeline, etc., and then sends them to the control module. The control module analyzes the bleeding situation based on the changes in the received digital signals representing the original light intensity and the digital signals representing the detection light intensity.

[0064] Embodiment 2

[0065] like Figure 4 and Figure 7 As shown, this embodiment provides a blood leakage monitoring method based on the blood leakage monitoring device provided in the first embodiment, which specifically includes the following steps:

[0066] The control module controls the light emitting module to poll the liquid storage tank to emit R, G, B three-color detection light, and the reference receiving end and the detection receiving end synchronously collect the original light intensity of the R, G, B three-color detection light emitted by the light emitting module and the detection light intensity of the R, G, B three-color detection light passing through the liquid storage tank. The original light intensity and the detection light intensity are processed by the AD module analog-to-digital conversion and the signal processing module dynamic smoothing filtering, and then received by the control module.

[0067] Since both the reference receiving end and the detection receiving end in this embodiment are photodiodes, the AD module reads the signal of the photodiode of the reference receiving end and the signal of the photodiode of the detection receiving end, converts them into RGB signals according to the timeline, and then performs dynamic smoothing filtering to obtain a stable signal, which is received by the control module.

[0068] The control module calculates the slope of the G and B signals of the detected light intensity. The specific calculation method is: slide the filtered G and B signals into the slope calculation array and use the least squares method to dynamically calculate them. Since the G and B signals will have a significant decline when bleeding occurs, it is determined whether to start monitoring bleeding by monitoring the slope of the G and B signals. When the slope of the G and B signals meets the bleeding state, that is, when the slope of the G and B signals exceeds the slope threshold, monitoring bleeding begins. At this time, start to quickly monitor the R, G, and B signal ratios, as follows:

[0069] The R, G, B signals of the original light intensity are used to proportionally compensate the R, G, B signals of the detected light intensity, and the detection ratio G / R and the detection ratio B / R are calculated:

[0070] Detection ratio G / R = (G 检测接收端 / R 检测接收端 )*(R 基准接收端 / G 基准接收端 );

[0071] Detection ratio B / R = (B 检测接收端 / R 检测接收端 )*(R reference receiving end / B 基准接收端 ).

[0072] Among them, R 检测接收端 To detect the R signal strength at the receiving end, G 检测接收端 To detect the G signal strength at the receiving end, B 检测接收端 To detect the B signal strength at the receiving end, R 基准接收端 is the R signal strength of the reference receiving end; G 基准接收端 is the G signal strength of the reference receiving end, B 基准接收端 The B signal strength of the reference receiving end. When the detection ratio G / R and the detection ratio B / R exceed their corresponding alarm ratios G / R and B / R respectively, a blood leakage alarm is issued. When at least one of the detection ratio G / R or the detection ratio B / R does not exceed its corresponding alarm ratio G / R or B / R, the blood leakage alarm is cancelled or no alarm is issued.

[0073] like Figure 5As shown, the light intensity data of the R, G, and B three-color LED lamps under the rated current is corrected and saved at the factory. During the implementation of this embodiment, light tracing is performed. Specifically, the light intensity data of the R, G, and B three-color LED lamps are read in real time. In this embodiment, the light intensity data of the R, G, and B three-color LED lamps are obtained by reading the constant current source current data and converting it into light intensity data in proportion to the linear relationship between the current and the light intensity. When the deviation between the light intensity data and the light intensity data corrected and saved at the factory exceeds the first set threshold, such as exceeding 20%, the data, parameters, and various thresholds are recalibrated, such as calibrating the RGB value of the photodiode of the current state reference receiving end, the RGB value of the photodiode of the detection receiving end, and the data collected by the constant current source to the initial value; when the deviation between the light intensity data and the saved light intensity data exceeds the second set threshold, such as exceeding 30%, the device hardware is checked and updated. The second set threshold is greater than the first set threshold, for example, the first set threshold is 20%, and the second set threshold is 30%.

[0074] like Figure 6 As shown, when no blood leakage alarm occurs during operation and the current data does not fluctuate or fluctuates slightly (within the allowable range), the average value of the R, G, and B signals of the detection light intensity within the set time or the set number of data is recalculated every set interval or every time a set number of data is collected, and the alarm ratio G / R and the alarm ratio B / R are calculated based on the average value. For example, a group of detection light intensity data of the detection receiving end is recorded every 5 seconds, and the recorded detection light intensity data is filtered every 2 minutes, and the average value of the R, G, and B signals is calculated. The alarm ratio G / R and the alarm ratio B / R are calculated based on the average value, and used as the subsequent blood leakage alarm ratio for blood leakage monitoring.

[0075] When a blood leakage alarm occurs when the set time is not reached or the set amount of data is not collected, or a large data fluctuation occurs (i.e., exceeds the allowable range), the data from the last calculation of the alarm ratio to the current period is discarded, and the alarm ratio obtained from the last calculation is used as the current detection alarm ratio for blood leakage monitoring.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0077] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A blood leakage monitoring device, characterized in that: include: A light emitting module, used for emitting detection light to the liquid storage tank; A reference receiving end, used to collect the original light intensity of the detection light emitted by the light-emitting module; A detection receiving end, used for collecting the detection light intensity of the detection light passing through the liquid storage tank; The control module controls the light emitting module to emit detection light, receives the original light intensity collected by the reference receiving end and the detection light intensity collected by the detection receiving end, and analyzes the blood leakage situation based on the relative change between the original light intensity and the detection light intensity.

2. The blood leakage monitoring device according to claim 1, characterized in that: It also includes a plurality of reflective lenses arranged in the propagation direction of the detection light; The reflective lens allows the detection light to irradiate the detection receiving end when there is liquid in the liquid storage tank, and deviate from the detection receiving end when there is no liquid or bubbles in the liquid storage tank.

3. The blood leakage monitoring device according to claim 1, characterized in that: The reference receiving end is arranged in front of the liquid storage tank and in the same direction as the vertical direction of the light emitting direction of the light emitting module. The detection receiving end is arranged behind the liquid storage tank and in the same direction as the light emitting direction of the light emitting module.

4. The blood leakage monitoring device according to claim 1, characterized in that: The liquid storage tank comprises a high-transmittance cylindrical glass tube, which is connected to a water system, and the liquid enters from the lower end of the high-transmittance glass tube and exits from the upper end.

5. The blood leakage monitoring device according to claim 1, characterized in that: It also includes a constant current source circuit, which is electrically connected to the light emitting module to provide a stable power supply to the light emitting module.

6. The blood leakage monitoring device according to claim 1, characterized in that: The light emitting module is a three-color LED lamp of R, G, and B, and the control module controls the three-color LED lamp of R, G, and B to emit red light, green light, and blue light in turn; The reference receiving end and the detection receiving end synchronously collect the original light intensity of the detection light emitted by the three-color LED lights of R, G, and B and the detection light intensity after passing through the liquid storage tank; The control module determines whether to start monitoring blood leakage based on the slope of the G and B signals of the detection light intensity; uses the R, G, B signals of the original light intensity to proportionally compensate the R, G, B signals of the detection light intensity, calculates the detection ratio, and determines whether to issue a blood leakage alarm based on the detection ratio.

7. The blood leakage monitoring device according to claim 1, characterized in that: The reference receiving end and the detection receiving end each include a photodiode, the photodiode of the reference receiving end and the photodiode of the detection receiving end are electrically connected to an AD module, the AD module is electrically connected to a signal processing module, and the signal processing module is connected to a control module; The AD module performs analog-to-digital conversion on the current signal of the photodiode at the reference receiving end and the current signal of the photodiode at the detection receiving end and sends them to the signal processing module. The signal processing module performs dynamic smoothing filtering on the current signal after the analog-to-digital conversion and sends it to the control module.

8. A blood leakage monitoring method, characterized in that: The following steps are involved: Control the light emitting module to emit R, G, and B three-color detection light to the liquid storage tank; Synchronously collect the original light intensity of the R, G, B three-color detection light emitted by the light-emitting module and the detection light intensity of the R, G, B three-color detection light passing through the liquid storage tank; calculate the G, B signal slope of the detection light intensity, and start monitoring blood leakage when the G, B signal slope exceeds the slope threshold; The R, G, B signals of the original light intensity are used to proportionally compensate the R, G, B signals of the detected light intensity, and the detection ratios G / R and B / R are calculated: Detection ratio G / R = (G 检测接收端 / R 检测接收端 )*(R 基准接收端 / G 基准接收端 ); Detection ratio B / R = (B 检测接收端 / R 检测接收端 )*(R 基准接收端 / B 基准接收端 ); Among them, R 检测接收端 To detect the R signal strength at the receiving end, G 检测接收端 To detect the G signal strength at the receiving end, B 检测接收端 To detect the B signal strength at the receiving end, R 基准接收端 is the R signal strength of the reference receiving end; G 基准接收端 is the G signal strength of the reference receiving end, B 基准接收端 is the signal strength of B at the reference receiving end; When the detection ratio G / R and the detection ratio B / R exceed their corresponding alarm ratios, a blood leakage alarm is issued.

9. The blood leakage monitoring method according to claim 8, characterized in that: Read the constant current source current data in real time and convert it into light intensity data. When the deviation between the light intensity data and the stored light intensity data exceeds a first set threshold, the data, parameters and various thresholds are recalibrated; When the deviation between the light intensity data and the stored light intensity data exceeds a second set threshold, the device hardware is checked and updated.

10. The blood leakage monitoring method according to claim 8, characterized in that: When no blood leakage alarm occurs and the current data fluctuation is within the allowable range, the average values ​​of the R, G, and B signals of the detection light intensity within the set time period or the set number of data are recalculated every set time interval or every time a set number of data is collected, and the alarm ratio G / R and the alarm ratio B / R are calculated based on the average values; When a blood leakage alarm occurs before the set duration is reached or the set amount of data is not collected, or the current data fluctuation exceeds the allowable range, the data from the last calculation of the alarm ratio to the current time will be discarded, and the alarm ratio calculated last time will be used as the alarm ratio for the current detection.

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