CN110639077A - Blood leakage monitoring device and monitoring method for continuous blood purification equipment - Google Patents
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- 239000008280 blood Substances 0.000 title claims abstract description 84
- 210000004369 blood Anatomy 0.000 title claims abstract description 84
- 238000012806 monitoring device Methods 0.000 title claims abstract description 26
- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 238000000746 purification Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 20
- 239000003086 colorant Substances 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000012528 membrane Substances 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 238000000502 dialysis Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000003053 toxin Substances 0.000 description 2
- 231100000765 toxin Toxicity 0.000 description 2
- 108700012359 toxins Proteins 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000005693 optoelectronics Effects 0.000 description 1
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- 238000009256 replacement therapy Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/14—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis
- A61M1/16—Dialysis systems; Artificial kidneys; Blood oxygenators ; Reciprocating systems for treatment of body fluids, e.g. single needle systems for hemofiltration or pheresis with membranes
- A61M1/1692—Detection of blood traces in dialysate
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
- A61M1/3621—Extra-corporeal blood circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/38—Investigating fluid-tightness of structures by using light
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/15—Detection of leaks
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Abstract
The invention provides a blood leakage monitoring device and a detection method for continuous blood purification equipment. The blood leakage monitoring device comprises a tricolor LED for sending light to a disposable transparent blood pipeline special for blood purification, an LED driver for driving the tricolor LED and a color sensor for collecting the light passing through the transparent pipeline; the LED driver and the color sensor are respectively connected with the MCU, and the MCU controls the tricolor LEDs to respectively emit light with red, green and blue colors and simultaneously starts the filters with the same color of the color sensor; the transparent pipeline is externally provided with a first lens and a second lens which are used for fixing the transparent pipeline and transmitting light, and the first lens and the second lens are provided with in-place sensors. This monitoring devices that leaks blood sets up the sensor that targets in place through between first lens and second lens, can detect transparent pipeline and whether reinstall, if have, then can carry out white balance again, marks the colour of transparent pipeline, has improved the accuracy of the monitoring of leaking blood.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to a blood leakage monitoring device and a monitoring method for continuous blood purification equipment.
Background
At present, the clinical treatment method of blood purification is to draw the blood of a patient through a blood filter or a dialyzer by a pipeline, the core of the filter and the dialyzer is a semipermeable membrane which only allows molecules smaller than the membrane pores to pass through, the semipermeable membrane divides the filter or the dialyzer into an inner channel and an outer channel, one channel flows blood, the other channel flows dialysate, and the pressure of the dialysate is smaller than the pressure of the blood, so the molecules (toxins to be filtered) smaller than the membrane pores in the blood can permeate into the dialysate, other components of the blood are refluxed to a human body, if the pressure of the blood exceeds a normal range, the semipermeable membrane can be crushed, and the blood directly flows into the dialysate, so the blood of the patient is lost, and the life is threatened. Blood monitoring of the dialysate is therefore very important.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a blood leakage monitoring device and a monitoring method for continuous blood purification equipment.
In order to achieve the above object, the present invention provides a blood leakage monitoring device for a continuous blood purification apparatus, comprising three primary color LEDs for transmitting light to a disposable transparent blood conduit dedicated for blood purification, an LED driver for driving the three primary color LEDs, and a color sensor for collecting light passing through the transparent conduit; the LED driver and the color sensor are respectively connected with the MCU, and the MCU controls the red, green and blue lights of the tricolor LED and simultaneously starts the filters with the same color of the color sensor;
the transparent pipeline is externally provided with a first lens and a second lens which are used for fixing the transparent pipeline and transmitting light, the first lens and the tricolor LED are located on the same side, the second lens and the color sensor are located on the same side, an in-place sensor is arranged between the first lens and the second lens, the output end of the in-place sensor is connected to the MCU, and when liquid exists in the transparent pipeline and the in-place sensor detects an in-place signal again, the MCU carries out white balance.
According to the blood leakage monitoring device, the in-place sensor is arranged between the first lens and the second lens, when the transparent pipeline is reinstalled, in-place signals of the in-place signal sensor can go through the process from absence to presence or from presence to absence and then from absence to presence, so that the in-place sensor can detect whether the transparent pipeline is reinstalled, if the transparent pipeline is reinstalled, the MCU can conduct white balance again, and the accuracy of blood leakage monitoring is improved.
The preferred scheme of the blood leakage monitoring device is as follows: the first lens and the second lens are both concave lenses and are matched with each other and buckled on the periphery of the transparent pipeline. By using the concave lens, the transparent pipeline can not be flattened to influence the measurement sensitivity, the natural resilience and deformation of the transparent pipeline can not influence the stability, and the sensitivity and the accuracy of blood leakage monitoring are effectively improved.
The preferred scheme of the blood leakage monitoring device is as follows: the in-place sensor is a Hall sensor, magnetic steel of the Hall sensor is arranged on one of the first lens and the second lens, and a Hall element of the Hall sensor is arranged on the other of the first lens and the second lens. The Hall sensor is low in price, high in detection accuracy and easy to install.
The preferred scheme of the blood leakage monitoring device is as follows: and a photodiode is arranged on the outer side of the transparent pipeline and is connected with the MCU. In clinical application, air can appear in dialysate in a transparent pipeline, so that two media to be detected comprise dialysate and air, different media have different attenuation coefficients to light and can influence the accuracy of blood leakage measurement, a photodiode is adopted to detect the media (dialysate or air) in the transparent pipeline, and when no liquid or air exists in the transparent pipeline, blood leakage monitoring is suspended to improve the accuracy of blood leakage monitoring.
The invention also provides a blood leakage monitoring method, which comprises the following steps:
s1, electrifying the blood leakage monitoring device, outputting an in-place signal by the in-place sensor when liquid flows into the transparent pipeline, and starting white balance: the MCU controls the tricolor LED to emit red light, simultaneously starts a red filter of the color sensor, the color sensor measures the light intensity of the red light, the color sensor adjusts the frequency of output pulses according to different measured light intensities, the MCU captures a first pulse to start timing, simultaneously counts the pulses, adds 1 to 1 pulse every time 1 pulse is captured, stops timing after the count reaches 255, and records the timing time as red light white balance time TR, so that the red light white balance is finished; white balance is carried out on the blue light and the green light according to the method to obtain blue light white balance time TB and green light white balance time TG, and white balance is finished;
s2, after white balance is successful, whether the transparent pipeline has liquid and the in-place sensor has in-place signal output is identified again, blood leakage monitoring is suspended if any one of the two conditions is not met, and real-time blood leakage monitoring is performed if both conditions are met: the MCU controls the tricolor LED to emit red light, simultaneously starts a red filter of the color sensor, the color sensor adjusts the frequency of output pulses according to different measured light intensities, the MCU captures a first pulse, starts to count down the red light and white balance time TR, simultaneously counts the pulses, adds 1 to 1 pulse every time the MCU captures the first pulse, stops pulse counting until the red light and white balance time TR is counted down, records the number of the captured pulses as RF as a red light intensity signal, and finishes the measurement of the red light intensity; measuring the light intensity of the green light and the blue light according to the method to obtain a green light intensity signal GF and a blue light intensity signal BF;
s3, subtracting the green light intensity signal GF and the blue light intensity signal BF from the red light intensity signal RF, when the difference values are both larger than the set value X and the difference value between the green light intensity signal GF and the blue light intensity signal BF is smaller than the set value X, the occurrence of blood leakage is proved, the MCU controls the alarm to give an alarm, otherwise, the occurrence of blood leakage is considered.
When the two lenses are fixed, the in-place sensor outputs in-place signals, then whether liquid exists in a tested pipeline is detected, if no liquid exists, white balance is suspended, white balance is marked to fail, white balance is carried out again after liquid exists, the MCU controls the tricolor LEDs to sequentially emit red, green and blue light, simultaneously, filters of corresponding colors of the color sensor are started, the color sensor adjusts the frequency of output pulses according to different measured light intensities, the MCU captures 255 pulses of time TR, TG and TB when measuring each color respectively, and white balance is finished.
When the in-place sensor is a Hall sensor, after the first lens and the second lens are fixed, the Hall element senses a magnetic field, and the output level is changed from high to low and is sent to the MCU.
The invention has the beneficial effects that: the blood leakage monitoring device has high sensitivity and reliability, and effectively improves the safety guarantee of patients in the dialysis process.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of the construction of a blood leakage monitoring device;
FIG. 2 is a flow chart of a method of blood leakage monitoring;
fig. 3 is a white balance flow chart.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the present invention provides a blood leakage monitoring device for continuous blood purification equipment, which comprises a three-primary-color LED2 for sending light to a disposable transparent blood tube dedicated for blood purification, an LED driver 1 for driving the three-primary-color LED2, and a color sensor 7 for collecting light passing through the transparent tube 4; the LED driver 1 and the color sensor 7 are connected to the MCU10, respectively. The transparent pipeline 4 is usually a special disposable pipeline matched with continuous blood purification equipment, dialysate containing toxins filtered from blood flows through the pipeline during clinical treatment, the color sensor 7 consists of 3 electronic filters (red, blue and green) and a light frequency converter, the MCU10 controls the tricolor LED2 to emit light with different colors, the filters with the same color of the color sensor 7 are turned on, only allowed colors pass through the lens after the filters are turned on and are received by the light frequency converter, the light frequency sensor adjusts the frequency of output pulses according to the light intensity of the received light, the pulses are input to the MCU10, and the MCU10 measures the pulse frequency and reduces the pulse frequency to the light intensity.
The transparent pipeline 4 is externally provided with a first lens 3 and a first lens 6 which are used for fixing the transparent pipeline 4 and transmitting light, the first lens 3 and the tricolor LED2 are located on the same side, the first lens 6 and the color sensor 7 are located on the same side, an in-place sensor is arranged between the first lens 3 and the first lens 6 and can be used for detecting whether the first lens 3 and the first lens 6 are installed again or not and are installed in place or not, and the output end of the in-place sensor is connected to the MCU 10.
When the transparent pipeline 4 is replaced, the first lens 3 and the first lens 6 are separated, a new transparent pipeline 4 is replaced, the in-place sensor cannot acquire in-place signals in the replacement process, when the transparent pipeline 4 is replaced and the lenses are closed, the in-place sensor acquires in-place signals again and sends the in-place signals to the MCU10, if liquid exists in the transparent pipeline 4 at the moment, the MCU10 performs white balance or white balance again, and whether the liquid exists in the transparent pipeline 4 or not can be monitored through artificial observation or other components.
In this embodiment, the in-place sensor is preferably but not limited to a hall sensor, one of the first lens 3 and the first lens 6 is provided with a magnetic steel 8 of the hall sensor, the other of the first lens 3 and the first lens 6 is provided with a hall element 9 of the hall sensor, and the magnetic steel 8 and the hall element 9 are preferably but not limited to be provided at the end portions of the first lens 3 and the first lens 6. When changing transparent pipeline 4, with first lens 3 and first lens 6 separately, magnet steel 8 has left hall element 9, the high level of hall element 9 output, when transparent pipeline 4 has changed and has closed lens, hall element 9 output low level, MCU10 discerns the level change after, white balance again. The in-place sensor can also be an optoelectronic switch or other forms of in-place switches.
First lens 3 and first lens 6 are preferably but not limited to concave lens, and concave lens adopts transparent material processing to form, and the interior concave radian is the same with the appearance circular arc of transparent pipeline 4, and two concave lens cooperate each other to detain and establish on transparent pipeline 4 periphery.
The embodiment also provides a preferable scheme: and a photodiode 5 is arranged outside the transparent pipeline 4, and the photodiode 5 is connected with the MCU 10. Preferably, the photodiode 5 is disposed in a direction perpendicular to the light emitting direction of the three primary color LEDs 2.
The photodiode 5 is used for detecting whether dialysate exists in the transparent pipeline 4, when the dialysate exists in the transparent pipeline 4, light is directly transmitted to the color sensor 7 by the dialysate, and the light intensity received by the photodiode 5 is very weak and outputs high level; when no liquid exists in the transparent pipeline 4, light can be reflected by the pipe wall in a reciprocating mode, the light intensity received by the photodiode 5 in the vertical direction is greatly enhanced, the photodiode 5 outputs low level, and the MCU10 performs different processing according to the output level of the photodiode 5: when the white balance is not completed, if the photodiode 5 outputs a high level to the MCU10, the MCU10 continues to perform the white balance, and if the photodiode 5 outputs a low level to the MCU10, the MCU10 stops the white balance; after the white balance is finished, if the photodiode 5 outputs a low level to the MCU10, it indicates that there is no liquid in the transparent pipeline 4, the blood leakage monitoring is suspended, and the dialysis system can be controlled to suspend dialysis at the same time, and if the photodiode 5 outputs a high level to the MCU10, it indicates that there is liquid in the transparent pipeline 4, and the blood leakage monitoring is continued.
The invention also provides an embodiment of a blood leakage monitoring method, which adopts the blood leakage monitoring device, and as shown in fig. 2, the detection method comprises the following steps:
s1, electrifying the blood leakage monitoring device, and after the liquid flows into the transparent pipeline and the in-place sensor outputs in-place signals, starting white balance: the MCU controls the tricolor LED to emit red light, simultaneously starts a red filter of the color sensor, the color sensor measures the light intensity of the red light, the color sensor adjusts the frequency of output pulses according to different measured light intensities, the MCU captures a first pulse to start timing, simultaneously counts the pulses, adds 1 to 1 pulse every time 1 pulse is captured, stops timing after the count reaches 255, and records the timing time as red light white balance time TR, so that the red light white balance is finished; and the MCU controls the tricolor LEDs to respectively emit green light and blue light, correspondingly starts a green filter and a blue filter of the color sensor at the same time, repeats the step of measuring the red light white balance time TR, respectively measures and obtains the green light white balance time TG and the blue light white balance time TB, and the white balance is finished.
S2, after white balance is successful, whether liquid exists in the transparent pipeline and the in-place sensor outputs in-place signals is identified again, blood leakage monitoring is suspended when any one condition of the two conditions is not met, real-time blood leakage monitoring is conducted when both conditions are met, the MCU controls the tricolor LEDs to emit red light, a red filter of the color sensor is started at the same time, the color sensor adjusts the frequency of output pulses according to different measured light intensities, the MCU starts to count down red light white balance time TR after capturing a first pulse, pulse counting is conducted simultaneously, 1 pulse is added when capturing 1 pulse, pulse capturing is stopped until the TR counts down, the number of captured pulses is recorded as RF and used as red light intensity signals, and red light intensity measurement is completed. The MCU switches the LED light-emitting color and the color sensor filter, repeats the steps, and obtains a green light intensity signal GF and a blue light intensity signal BF by the number of the captured pulses in the time of TG and TB respectively.
Since if the color of the liquid in the line is the same as in white balance, then RF, GF, BF are all equal to 255. If the liquid turns red in color, the liquid will block the green and blue light, and the measured GF, BF, will decrease.
Therefore, S3, the green light intensity signal GF and the blue light intensity signal BF are subtracted from the red light intensity signal RF, when the difference values are both larger than the set value X and the difference value between the green light intensity signal GF and the blue light intensity signal BF is smaller than the set value X, the occurrence of blood leakage is proved, the MCU controls the alarm to give an alarm, otherwise, the occurrence of blood leakage is considered. The set value X can be set according to the sensitivity requirement, the purpose of judging that the difference value between the green light intensity signal GF and the blue light intensity signal BF is less than the set value X is to prevent false alarm, and when the plasma replacement therapy is clinically carried out, the waste plasma flowing through the pipeline is yellow and reddish, has larger attenuation on blue light, has smaller attenuation on green light and does not attenuate on red light. Simply judging the difference between red light and green and blue light is prone to false alarm. Comparing the difference between the blue light and the green light again can effectively improve the reliability.
As shown in fig. 3, here, the white balance method is:
when the first lens 3 and the first lens 6 are fixed, the in-place sensor outputs in-place signals, if the in-place sensor is a Hall sensor, after the two lenses are fixed, the Hall element 9 senses a magnetic field, the output level changes from high to low and is sent to the MCU10, the MCU10 judges that the two lenses are fixed, the MCU10 detects whether liquid exists in a detected pipeline according to the photodiode 5, if no liquid exists, white balance is suspended, if liquid exists, the MCU controls the three primary color LEDs to respectively emit red, green and blue light, filters of corresponding colors of the color sensor are simultaneously turned on, the color sensor adjusts the frequency of output pulses according to different measured light intensities, and the MCU captures 255 pulses of time TR, TG and TB when measuring each color respectively, so that white balance is completed.
In this embodiment, the sequence of turning on the red, green, and blue light is not limited, and only the color of the light turned on by the three-primary-color LED corresponds to the color filter turned on by the color sensor, where R represents red, G represents green, and B represents blue.
In the embodiment, the relative variation of the light intensity is concerned, so the light intensity described in the invention is a relative value, which is different from the actual light intensity; the frequency described in this embodiment is not the true frequency of light, and means the number of pulses output by the color sensor 7 per unit time, and the stronger the light intensity, the larger the number of pulses output.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A blood leakage monitoring device for continuous blood purification equipment is characterized by comprising three primary colors of LEDs for sending light to a disposable transparent blood pipeline special for blood purification, an LED driver for driving the three primary colors of LEDs and a color sensor for collecting the light passing through the transparent pipeline; the LED driver and the color sensor are respectively connected with the MCU, and the MCU controls the tricolor LEDs to respectively emit light with red, green and blue colors and simultaneously starts the filters with the same color of the color sensor;
the LED color display device is characterized in that a first lens and a second lens which are used for fixing the transparent pipeline and transmitting light are arranged outside the transparent pipeline, the first lens and the tricolor LEDs are located on the same side, the second lens and the color sensor are located on the same side, an in-place sensor is arranged between the first lens and the second lens, the output end of the in-place sensor is connected to the MCU, and when the in-place sensor detects an in-place signal again and recognizes that liquid exists in the transparent pipeline, the MCU carries out white balance.
2. The blood leakage monitoring device for the continuous blood purification apparatus according to claim 1, wherein the first lens and the second lens are concave lenses, and are matched with each other and buckled on the periphery of the transparent pipeline.
3. The blood leakage monitoring device for the continuous blood purification apparatus according to claim 1, wherein the in-place sensor is a hall sensor, one of the first lens and the second lens is provided with magnetic steel of the hall sensor, and the other of the first lens and the second lens is provided with a hall element of the hall sensor.
4. The blood leakage monitoring device for the continuous blood purification equipment according to claim 1, wherein a photodiode is further arranged outside the transparent pipeline, and the photodiode is connected with the MCU.
5. The blood leakage monitoring device for a continuous blood purification apparatus according to claim 4, wherein the photodiode is disposed in a direction perpendicular to a light emitting direction of the three primary color LEDs.
6. The blood leakage monitoring device for the continuous blood purification apparatus according to any one of claims 1 to 5, further comprising an alarm connected to the MCU.
7. A method for monitoring blood leakage, using the blood leakage monitoring device according to any one of claims 1 to 6, the detection method comprising the steps of:
s1, electrifying the blood leakage monitoring device, outputting an in-place signal by the in-place sensor when liquid flows into the transparent pipeline, and starting white balance: the MCU controls the tricolor LED to emit red light, simultaneously starts a red filter of the color sensor, the color sensor measures the light intensity of the red light, the color sensor adjusts the frequency of output pulses according to different measured light intensities, the MCU captures a first pulse to start timing, simultaneously counts the pulses, adds 1 to 1 pulse every time 1 pulse is captured, stops timing after the count reaches 255, and records the timing time as red light white balance time TR, so that the red light white balance is finished; white balance is carried out on the blue light and the green light according to the method to obtain blue light white balance time TB and green light white balance time TG, and white balance is finished;
s2, after white balance is successful, whether the transparent pipeline has liquid and the in-place sensor has in-place signal output is identified again, blood leakage monitoring is suspended if any one of the two conditions is not met, and real-time blood leakage monitoring is performed if both conditions are met: the MCU controls the tricolor LED to emit red light, simultaneously starts a red filter of the color sensor, the color sensor adjusts the frequency of output pulses according to different measured light intensities, the MCU captures a first pulse, starts to count down the red light and white balance time TR, simultaneously counts the pulses, adds 1 to 1 pulse every time the MCU captures the first pulse, stops pulse counting until the red light and white balance time TR is counted down, records the number of the captured pulses as RF as a red light intensity signal, and finishes the measurement of the red light intensity; measuring the light intensity of the green light and the blue light according to the method to obtain a green light intensity signal GF and a blue light intensity signal BF;
s3, subtracting the green light intensity signal GF and the blue light intensity signal BF from the red light intensity signal RF, when the difference values are both larger than the set value X and the difference value between the green light intensity signal GF and the blue light intensity signal BF is smaller than the set value X, the occurrence of blood leakage is proved, the MCU controls the alarm to give an alarm, otherwise, the occurrence of blood leakage is considered.
8. The method for monitoring blood leakage according to claim 7, wherein the white balance method is:
when the two lenses are fixed, the in-place sensor outputs in-place signals, then whether liquid exists in a tested pipeline is detected, if no liquid exists, white balance is suspended, white balance is marked to fail, white balance is carried out again after liquid exists, the MCU controls the tricolor LEDs to sequentially emit red, green and blue light, simultaneously, filters of corresponding colors of the color sensor are started, the color sensor adjusts the frequency of output pulses according to different measured light intensities, the MCU captures 255 pulses of time TR, TG and TB when measuring each color respectively, and white balance is finished.
9. The method of claim 8, wherein when the in-position sensor is a hall sensor, the hall sensor senses a magnetic field after the first lens and the second lens are fixed, and the output level changes from high to low and is transmitted to the MCU.
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| CN201911023366.XA CN110639077A (en) | 2019-10-25 | 2019-10-25 | Blood leakage monitoring device and monitoring method for continuous blood purification equipment |
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| CN201911023366.XA CN110639077A (en) | 2019-10-25 | 2019-10-25 | Blood leakage monitoring device and monitoring method for continuous blood purification equipment |
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