CN112577912A - Zero calibration abnormity detection method and breathing gas monitoring equipment - Google Patents
Zero calibration abnormity detection method and breathing gas monitoring equipment Download PDFInfo
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Abstract
The invention relates to the technical field of medical instruments, and particularly discloses a zero calibration abnormity detection method and breathing gas monitoring equipment. The method is used in a respiratory gas monitoring device, and a gas circuit of the respiratory gas monitoring device comprises an atmospheric channel; the method comprises the following steps: acquiring a zero calibration instruction; controlling a gas path of the respiratory gas monitoring equipment to be switched to an atmospheric channel according to a zero calibration instruction; acquiring gas path state information of an atmospheric channel; and determining whether the zero calibration condition of the breathing gas monitoring equipment is abnormal or not according to the gas circuit state information. Whether the zero calibration condition of the equipment is abnormal can be judged only through the gas circuit state information, the condition that the zero reference value is inaccurate due to the zero calibration abnormity of the breathing gas monitoring equipment can be conveniently and quickly eliminated, so that the accurate zero reference value is obtained, the inaccuracy of the subsequent measurement result caused by the abnormal zero reference value is avoided, and the misleading of a doctor to carry out improper operation is avoided.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a zero calibration abnormity detection method and breathing gas monitoring equipment.
Background
Respiratory gas monitoring is mainly used for monitoring physiological parameters related to vital signs of respiration of patients, and is often related to respiration rate and exhaled CO2Concentration, uptake of CO2Concentration and waveform. The method mainly monitors respiration related physiological parameters of an anesthesia patient in an operation or monitors an ICU patient in real time, gives medical care personnel prompts according to test results, and makes corresponding adjustment in time.
By CO in the exhaled air2Concentration measurement, for example, based on Lambert-beer's law of spectral absorption, i.e. CO2The absorption peak of the gas in the infrared spectrum has absorption effect on infrared light with corresponding wavelength, and the absorption intensity is positively correlated with the concentration thereof. The concentration of the gas can be determined by the effect of the gas being detected on the intensity of the transmitted infrared light. The relation between the transmitted light intensity and the concentration of the absorbed gas meets the Lambert-beer law, and the real-time gas concentration is monitored by detecting the change of the transmitted light intensity.
In the actual measurement, usually CO is first obtained2The transmitted light intensity value when the concentration is zero, namely a zero reference value, and CO obtained according to the zero reference value and the zero reference value2Obtaining real-time CO according to the transmission light intensity value detected in real time by using the corresponding relation curve between the concentration value and the transmission light intensity value2Concentration value, so the accuracy of the zero reference value is very important, only the zero reference value is accurate, and the real-time CO obtained based on the value2The concentration value is absolutely accurate. If the zero reference value is acquired when the zero calibration is abnormal, the acquired zero reference value is inaccurate, and the real-time measurement result calculated by the zero reference value in the subsequent measurement process is also inaccurate, so that the doctor is misled to carry out improper operation, and the life safety of the patient is influenced.
Therefore, how to obtain an accurate zero reference value becomes a technical problem to be solved urgently.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is how to obtain the accurate zero reference value.
To this end, according to a first aspect, an embodiment of the present invention provides a zero calibration anomaly detection method for use in a respiratory gas monitoring apparatus, a gas circuit of which includes an atmospheric channel, the method including: acquiring a zero calibration instruction; controlling a gas path of the breathing gas monitoring equipment to be switched to an atmospheric channel according to the zero calibration instruction; wherein the atmospheric channel is in communication with ambient atmosphere; acquiring gas path state information of an atmospheric channel; and determining whether the zero calibration condition of the breathing gas monitoring equipment is abnormal or not according to the gas circuit state information.
Optionally, the gas path state information includes at least one of a gas path pressure value or a gas path flow rate.
Optionally, the respiratory gas monitoring device comprises: the channel switching device is connected with the gas circuit; the determining whether the zero calibration condition of the breathing gas monitoring device is abnormal according to the gas circuit state information comprises: judging whether the air path pressure value of the atmospheric channel is within a preset range or not; and when the air path pressure value of the atmospheric channel is not in a preset range, confirming that the zero calibration condition of the channel switching device is abnormal.
Optionally, the determining whether the air path pressure value of the atmospheric channel is within a preset range includes: acquiring an ambient atmospheric pressure value; judging whether the difference value between the ambient atmospheric pressure value and the gas circuit pressure value is within a preset difference value range or not; and when the difference value is not within the preset difference value range, confirming that the zero calibration condition of the channel switching device is abnormal.
Optionally, the respiratory gas monitoring apparatus comprises an air evacuation device connected to the channel switching device; the determining whether the zero calibration condition of the breathing gas monitoring device is abnormal according to the gas circuit state information comprises: acquiring the gas path flow rate of the atmospheric channel; judging whether the flow rate of the gas circuit is within a preset flow rate range or not; and when the flow rate of the gas circuit is not within the preset flow rate range, confirming that the zero calibration condition of the air exhaust device is abnormal.
Optionally, the method further comprises: and when the zero calibration condition of the respiratory gas monitoring equipment is normal, performing zero calibration operation.
Optionally, the method further comprises: acquiring alarm information of the breathing gas monitoring device to determine whether signal interference exists in the breathing gas monitoring device; performing a zeroing operation when the respiratory gas monitoring device is free of signal interference.
Optionally, the method further comprises: acquiring the concentration of a preset gas in the ambient atmosphere; judging whether the concentration of the preset gas is within a preset concentration range or not; and when the concentration of the preset gas is within the preset concentration range, performing zero calibration operation.
Optionally, the method further comprises: acquiring a respiratory waveform detected by the respiratory gas monitoring device; and when the respiratory waveform enters a baseline stage, executing a step of controlling the gas circuit of the respiratory gas monitoring equipment to be switched to the atmospheric channel according to the zero calibration instruction, or executing zero calibration operation.
According to a second aspect, embodiments of the present invention provide a respiratory gas monitoring device comprising: the gas path comprises a breathing passage and an atmosphere passage; the air channel switching device is connected with the air channel at one end; the channel switching device is used for switching the gas circuit; the air extracting device is connected with the other end of the channel switching device and is used for extracting air from the air channel; a memory also communicatively coupled to the controller; wherein the memory stores instructions executable by the one controller to cause the controller to perform the zeroing anomaly detection method of any one of the first aspects.
The invention has the following beneficial effects:
after the zero calibration instruction is obtained, switching the gas path of the breathing gas monitoring equipment to the atmospheric channel according to the zero calibration instruction so as to obtain gas path state information of the atmospheric channel; and confirming the working state of the respiratory gas monitoring equipment according to the gas circuit state information, and detecting whether the zero calibration condition of the respiratory gas monitoring equipment is abnormal or not through the gas circuit state information of the atmospheric channel. Therefore, whether the zero calibration condition of the equipment is abnormal or not can be judged only through the gas circuit state information, the condition that the zero reference value is inaccurate due to the abnormal zero calibration of the respiratory gas monitoring equipment can be conveniently and quickly eliminated, the accurate zero reference value is obtained, the inaccuracy of subsequent measurement results caused by the abnormal zero reference value is avoided, and misleading doctors to carry out inappropriate operation is avoided, so that the life safety of patients is influenced.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram showing a zeroing anomaly detection method of the present embodiment;
FIG. 2 is a schematic diagram showing a zeroing abnormality detection method of the present embodiment;
FIG. 3 shows CO2A concentration respiration waveform diagram;
FIG. 4 is a schematic diagram showing a zeroing abnormality detection method of the present embodiment;
fig. 5 shows a schematic structural diagram of the respiratory gas monitoring apparatus of the present embodiment.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background, to ensure the accuracy of respiratory gas monitoring, it is necessary to obtain an accurate zero reference value. The zero calibration operation is to obtain the latest CO2And updating the transmitted light intensity value when the concentration is zero to obtain a zero reference value. The existing zero calibration operation is generally that when the zero calibration operation is carried out, a gas path of respiratory gas monitoring equipment is firstly switched to an atmospheric channel, and CO in the ambient atmosphere is extracted2In a concentration as CO2The concentration is zero, so that a standard zero reference value is obtained.
However, during the research process of the zero calibration operation of the respiratory gas monitoring device, the inventor finds that the temperature inside the device continuously changes along with the continuous increase of the working time of the respiratory gas monitoring device, particularly the amplitude of the temperature change is relatively large in a period of time when the respiratory gas monitoring device is just started, and a detection sensor in the respiratory gas monitoring device belongs to a temperature sensitive device and generates corresponding drift along with the temperature change, namely when the actual CO is detected2The intensity value of the transmitted light detected changes when the concentration of the gas does not change. Meanwhile, the detection result may drift due to the change of the hardware circuit, the sensor and the device measuring device characteristics. Therefore, some detection elements, or hardware circuitry, of the respiratory gas monitoring device may affect the result of the zero reference value. Based on this, the present application proposes a zero calibration anomaly detection method to confirm whether the zero calibration condition of the breathing gas monitoring device is abnormal.
According to an embodiment of the present invention, the present invention firstly provides a respiratory gas monitoring apparatus, as shown in fig. 5, which includes a gas path 1, a channel switching device 2 connected to the gas path, an air extractor 3 connected to the gas path 1, a controller 4 connected to the channel switching device 2 and the air extractor 3, and a memory 5 communicatively connected to the controller 4.
The air path 1 at least includes an atmospheric air path 11 and a breathing air path 12. In fig. 5, only the atmospheric passage 11 and the breathing passage 12 are shown, but the gas circuit of the breathing gas monitoring apparatus in the embodiment of the present invention is not limited thereto, and may include other passages. The atmosphere channel 11 is communicated with the ambient atmosphere and is used for guiding the ambient atmosphere into the air chamber; the breathing passage 12 is in communication with the breathing gas for introducing the breathing gas into the chamber for use by the patient.
And the channel switching device 2 is used for switching the air channels. The passage switching means may be a three-way valve for switching the breathing passage 12 and the atmospheric passage 11. During normal measurement, the three-way valve is gated as a breathing passage 12, and breathing gas enters the gas chamber. During zero calibration operation, the three-way valve 2 is gated as an atmosphere channel 11, and ambient atmosphere enters the air chamber. The three-way valve 2 is used for switching the measurement gas circuit during zero calibration operation, and therefore, should be arranged at the front end of the gas circuit.
And the air exhausting device 3 is used for exhausting the breathing passage 12 and the atmosphere passage 11. The suction device 3 may be a diaphragm pump. The control gas circuit works under stable flow during normal measurement, and during the zero calibration operation, the diaphragm pump will be bled with great power, is the ambient air with the gas renewal in the air chamber fast. The diaphragm pump is preferably placed at the rear end of the channel switching device 2 to reduce the influence on the front end measurement. That is, one end of the channel switching device 2 is connected to the gas path 1, and the other end is connected to the diaphragm pump.
The controller 4 is connected to a three-way valve (not shown) and a diaphragm pump (not shown), and is used for controlling the three-way valve and the diaphragm pump to operate.
The memory 5 is communicatively connected to the controller 4, and stores instructions executable by the controller 4, the instructions being executed by the controller 4 to cause the controller to perform the zeroing anomaly detection method provided in the embodiments of the present invention. In particular, the memory 5, as a non-transitory computer readable storage medium, may be used for storing non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the zeroing method in the embodiments of the present application. The controller 4 executes various functional applications and data processing by running non-transitory software programs, instructions, and modules stored in the memory 5, that is, implements the zero-calibration anomaly detection method described in the embodiment of the present invention.
The memory 5 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of a processing device operated by the server, and the like. Further, the memory 5 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 5 optionally includes memory located remotely from the controller 4, and these remote memories may be connected to the controller via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The embodiment of the invention also provides a zero calibration anomaly detection method, which can be applied to the breathing gas monitoring equipment shown in the figure 5 to complete corresponding functions. FIG. 1 is a flow diagram of a zero-crossing anomaly detection method according to an embodiment of the present invention, it being noted that the steps illustrated in the flow diagram of the figure may be performed in a computer system, such as a set of computer-executable instructions, and that while a logical order is illustrated in the flow diagram, in some cases the steps illustrated or described may be performed in an order different than here.
As shown in fig. 1, the process includes the following steps:
and S11, acquiring a zero calibration instruction.
The zero calibration instruction can be an internal zero calibration instruction or an external zero calibration instruction. Wherein the internal zero calibration instruction comprises that the temperature change of an internal detection sensor of the respiratory gas monitoring device reaches a certain range, or the working time interval of the respiratory gas monitoring device reaches a certain threshold, or both the working time interval and the working time interval meet the condition; the external zero calibration instruction is an external manual zero calibration instruction.
And S12, controlling the air passage of the respiratory gas monitoring equipment to be switched to the atmosphere passage according to the zero calibration instruction.
The atmosphere channel is communicated with the ambient atmosphere, namely the gas in the atmosphere channel is the ambient atmosphere.
After the respiratory gas monitoring equipment receives the zero calibration instruction, the gas path is switched to the atmosphere channel, so that the gas acquired by the respiratory gas monitoring equipment is ambient atmosphere, and the ambient atmosphere is analyzed subsequently to determine whether the zero calibration condition of the expiratory gas monitoring equipment is abnormal.
In addition, the gas circuit of the respiratory gas monitoring equipment also comprises a breathing channel besides the atmospheric channel; or further still, there may be other channels, etc.
And S13, acquiring the air path state information of the atmosphere channel.
The gas path state information may include a gas path temperature, a gas path pressure value, or a gas path flow rate, etc. The acquired gas circuit state information can be correspondingly set according to actual conditions, the acquired gas circuit state information is not limited at all, and the acquired gas circuit state information can reflect the working state of the respiratory gas monitoring equipment.
Specifically, the gas path temperature may be measured by a temperature sensor in the respiratory gas monitoring device, or may be measured by another sensor, and the measured result is sent to the respiratory gas monitoring device again.
The gas circuit pressure value can be measured by using a corresponding sensor in the respiratory gas monitoring equipment, or can be measured by using other pressure measuring devices, and the measured result is sent to the respiratory gas monitoring equipment.
The gas circuit flow rate can be measured by a flow rate measuring device arranged in the respiratory gas monitoring equipment, or can be measured by other flow rate measuring devices, and the measured result is sent to the respiratory gas monitoring equipment.
And S14, confirming whether the zero calibration condition of the breathing gas monitoring equipment is abnormal or not according to the gas circuit state information.
As indicated above, the ambient atmosphere is typically CO2In a concentration as CO2The concentration is zero, so that a standard zero reference value is obtained. Because the atmosphere channel of the breathing gas monitoring equipment is communicated with the ambient atmosphere, whether the breathing monitoring equipment is normally switched after receiving the zero calibration instruction and/or normally works in the atmosphere channel can be determined to judge whether the zero calibration condition of the breathing monitoring equipment is abnormal.
Optionally, the gas circuit status information acquired by the breathing gas monitoring device includes at least one of a gas circuit pressure value or a gas circuit flow rate. Because the gas in the atmosphere channel is the ambient atmosphere, whether the respiration monitoring equipment is normally switched to the atmosphere channel can be determined by utilizing the gas pressure value in the atmosphere channel.
As the breathing gas monitoring equipment has certain requirements on the zero calibration time, and the gas in the atmospheric channel is the ambient atmosphere, the flow rate of the gas path in the atmospheric channel is determined. Therefore, whether the respiration monitoring equipment works normally in the atmospheric channel can be determined by adopting the flow rate of the air circuit.
In the zero calibration anomaly detection method provided by this embodiment, after the respiratory monitoring device acquires the zero calibration instruction, the gas path of the respiratory gas monitoring device is switched to the atmospheric channel according to the zero calibration instruction, so as to acquire the gas path state information of the atmospheric channel; and confirming the working state of the respiratory gas monitoring equipment according to the gas circuit state information, and detecting whether the zero calibration condition of the respiratory gas monitoring equipment is abnormal or not through the gas circuit state information of the atmospheric channel. Therefore, whether the zero calibration condition of the equipment is abnormal or not can be judged only through the gas circuit state information, the condition that the zero reference value is inaccurate due to the abnormal zero calibration of the respiratory gas monitoring equipment can be conveniently and quickly eliminated, the accurate zero reference value is obtained, the inaccuracy of subsequent measurement results caused by the abnormal zero reference value is avoided, and misleading doctors to carry out inappropriate operation is avoided, so that the life safety of patients is influenced.
In the present embodiment, a zero calibration anomaly detection method is also provided, and the zero calibration anomaly detection method can be applied to the breathing gas monitoring device shown in fig. 5 to achieve corresponding functions. Wherein, when the gas circuit of breathing gas monitoring facilities is 2, atmosphere passageway 11 and breathing passageway 12 promptly, so passageway auto-change over device 2 can adopt the three-way valve, 2 gas circuits are connected respectively to two input of three-way valve, and an output is connected with air exhaust device.
In the following, the channel switching device is taken as an example of a three-way valve, and the zero calibration abnormality detection is to detect the switching function of the three-way valve in the present embodiment because the zero calibration operation requires switching the three-way valve from the breathing channel 12 to the atmospheric channel 11, drawing ambient atmosphere as a gas concentration zero value to obtain a standard zero reference value, and if the three-way valve is not successfully switched to the atmospheric channel 11 and is still connected to the breathing channel of the patient, the zero reference value obtained by performing zero calibration at this time may be inaccurate. The specific detection principle is as follows: if the three-way valve is successfully switched to the atmosphere channel 11 at the moment, the acquired gas path pressure value should be within a preset range at the moment; if the pressure value of the air path is not within the preset range, it indicates that the three-way valve is not successfully switched to the atmospheric channel 11.
Fig. 2 is a flowchart of a zero-calibration anomaly detection method according to an embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:
and S21, acquiring a zero calibration instruction.
Please refer to S11 in fig. 1, which is not described herein again.
And S22, controlling the air passage of the respiratory gas monitoring equipment to be switched to the atmosphere passage according to the zero calibration instruction.
Wherein the atmospheric channel is in communication with ambient atmosphere.
Please refer to S12 in fig. 1, which is not described herein again.
And S23, acquiring the air path state information of the atmosphere channel.
The gas circuit state information comprises a gas circuit pressure value.
For a description of the air path pressure value, please refer to S13 in the embodiment shown in fig. 1, which is not repeated herein.
And S24, confirming whether the zero calibration condition of the breathing gas monitoring equipment is abnormal or not according to the gas circuit state information.
Specifically, S24 includes:
and S241, judging whether the air path pressure value of the atmospheric channel is within a preset range.
The determination of the preset range may be determined according to the ambient pressure value, and the specific value is not limited at all. Executing S242 when the air path pressure value of the atmospheric channel is not in the preset range; otherwise, the zero calibration condition of the channel switching device is determined to be normal, the zero calibration condition of the breathing gas monitoring equipment can be considered to be normal, the zero calibration operation can be executed subsequently, and whether the zero calibration condition of other devices of the breathing gas monitoring equipment is abnormal or not can be continuously detected.
S242, confirming that the zero calibration condition of the channel switching device is abnormal.
When the breathing gas monitoring equipment confirms that the zero calibration condition of the channel switching device is abnormal, reminding information of the abnormal zero calibration can be sent to inform a user that the zero calibration operation cannot be executed at the moment.
As an optional implementation manner of this embodiment, before the step S22, the method further includes:
(1) a respiratory waveform detected by a respiratory gas monitoring device is acquired.
(2) When the respiration waveform enters the baseline phase, S22 described above is performed again.
In general, the time required to obtain an accurate zero reference value is relatively long. Obviously, this zeroing operation affects the normal CO2The respiratory wave is measured, because the air path is switched to the respiratory channel 12 in the normal working process of the respiratory monitoring equipment, the respiratory waveform of the patient can be measured at the moment; after receiving the zero calibration instruction, the air path needs to be switched to the atmospheric channel 11, so that the breathing condition at the moment cannot be detected in real time, and the relatively critical breathing waveform is likely to be missed, which affects the judgment of medical care personnel. Meanwhile, the calculation of real-time measurement results of various parameters, such as the accuracy of the end-expiratory value, the inspiratory value and the respiratory rate value, can be influenced. Therefore, to avoid affecting the normal respiratory wave measurements, a zeroing operation is performed as the respiratory waveform enters the baseline phase. Specifically, as shown in FIG. 3, the expiratory phase of human respiration is CO-free2And the concentration is continuously increased, corresponding to the rising phase of the waveform, i.e. the phase from point B to point D in fig. 3, when the respiration waveform is in the rising phase and the waveform value is greater than a certain threshold value, point B is marked as the beginning of the expiratory phase, and when the waveform value reaches the peak value, point D is marked as the end of the expiratory phase.
The beginning of the inspiration phase, point D, is marked when the waveform begins in the descent phase, and the end of the inspiration phase is marked when the beginning of the next expiration phase begins.
In CO2In the inspiration phase of the concentration respiratory wave, when the waveform is in the descending phase and the waveform value is smaller than the preset concentration threshold value, namely the point A starts timing, and when the respiratory waveform is in the ascending phase and the waveform value is larger than the preset concentration threshold value, namely the point B ends timing, the time period is called as the period AB, and the concentration value is very low and is approximate to zero, also called as the baselineAnd (5) stage. According to the practical clinical application, when CO is used2When the inhalation concentration value of the gas is less than a certain range, it is of no practical clinical significance. Namely when CO is present2When the value of the inhaled concentration of the gas is less than a certain range, the value of the waveform of the segment is not of great practical reference value, i.e. corresponding to the AB segment of the baseline phase, the value of the waveform of the segment is not of great practical significance, and the CO is present2The value of the inspired concentration of the gas is nearly zero. It can be set with this as a reference, and zero-checking at this stage avoids the zero-checking operation on the CO2The influence of the suction concentration value of the gas is also reduced to the maximum extent2Effects of concentration respiration waveform.
Therefore, before S22, it is determined whether the respiration waveform enters the baseline phase; and when the respiration waveform enters a baseline stage, controlling the breathing gas monitoring module to be switched from the breathing channel to the atmosphere channel according to the zero calibration instruction.
In the present embodiment, a zero calibration anomaly detection method is also provided, and the zero calibration anomaly detection method can be applied to the breathing gas monitoring device shown in fig. 5 to achieve corresponding functions. Specifically, when the gas circuit of the respiratory gas monitoring device is switched to the respiratory channel 12, the air extracting device 3 is used for extracting air from the respiratory channel, i.e. introducing respiratory gas into the respiratory gas monitoring device for use by a patient; when the gas circuit of the respiratory gas monitoring device is switched to the atmospheric channel 11, the air extracting device 3 is used for extracting air from the atmospheric channel, that is, the ambient atmosphere is introduced into the respiratory gas monitoring device for detection. Alternatively, the air suction device 3 may be a diaphragm pump, or may be other devices, and is not limited in any way. In the following description, taking the diaphragm pump as an example, if a zero calibration instruction is received during the normal operation of the respiratory gas monitoring device, the gas path will be switched to the atmospheric channel 11, which will affect the real-time measurement of the respiratory waveform, and therefore, the shorter the zero calibration time, the better. Accordingly, a short zeroing time requires an increase in the operating power of the diaphragm pump to increase the gas flow rate in the atmospheric channel 11 in order to fill the gas chamber with ambient atmosphere instead of breathing gas for the set zeroing time to obtain the zero reference value. However, if the diaphragm pump operates abnormally, resulting in an insufficient flow rate of the air in the atmosphere passage 11 and failure to wash out the breathing gas during the zeroing time, the zero reference value obtained by performing the zeroing operation with reference to the breathing gas and the ambient atmosphere may be inaccurate. Based on this, the present embodiment employs a judgment of whether the flow rate of the air passage in the atmosphere passage 11 is within a preset flow rate range to determine whether the operation of the diaphragm pump is abnormal.
Fig. 4 is a flowchart of a zero-calibration anomaly detection method according to an embodiment of the present invention, as shown in fig. 4, the flowchart includes the following steps:
and S31, acquiring a zero calibration instruction.
Please refer to S11 in fig. 1, which is not described herein again.
And S32, controlling the air passage of the respiratory gas monitoring equipment to be switched to the atmosphere passage according to the zero calibration instruction.
Wherein the atmospheric channel is in communication with ambient atmosphere.
Please refer to S12 in fig. 1, which is not described herein again.
And S33, acquiring the air path state information of the atmosphere channel.
Wherein the gas path state information includes a gas path flow rate.
For a description of the air path pressure value, please refer to S13 in the embodiment shown in fig. 1, which is not repeated herein.
And S34, confirming whether the zero calibration condition of the breathing gas monitoring equipment is abnormal or not according to the gas circuit state information.
Specifically, S34 includes:
and S341, acquiring the air path flow rate of the atmosphere channel.
The gas flow rate can be obtained by obtaining the gas flow AD value; the gas path flow rate can also be acquired in other manners.
And S342, judging whether the air path flow rate of the atmosphere channel is within a preset flow rate range.
The preset flow rate range can be determined by the set zero calibration time and the size of the gas chamber, can be set according to an empirical value, and the like. The specific manner of determining the preset flow rate range is not limited in any way.
When the gas path flow rate of the atmospheric channel 11 is not within the preset flow rate range, executing S343; otherwise, the normal operation of the air extracting device 3 is confirmed. Under the condition that the air extracting device 3 works normally, zero calibration operation can be executed, and whether the zero calibration conditions of other devices in the respiratory gas monitoring equipment are abnormal or not can be continuously detected.
And S343, confirming that the zero calibration condition of the air extraction device is abnormal.
When the breathing gas monitoring equipment confirms that the zero calibration condition of the channel switching device 2 is abnormal, reminding information of the abnormal zero calibration can be sent to inform a user that the zero calibration operation cannot be executed at the moment.
Optionally, in this embodiment, it may also be detected whether the zero calibration condition of the channel switching device 2 of the respiratory gas monitoring apparatus is abnormal.
The detection of whether the zero calibration condition of the channel switching device 2 is abnormal or not can adopt the description of the embodiment shown in fig. 2; the following steps may also be adopted, that is, the above S34 may further include:
(1) and acquiring an ambient atmospheric pressure value.
The breathing gas monitoring equipment can directly acquire the ambient atmospheric pressure value from an external measuring device, and can also be provided with a corresponding detecting device in the expiration gas detecting equipment so as to detect the ambient atmospheric pressure value.
(2) And judging whether the difference value between the ambient atmospheric pressure value and the air path pressure value is within a preset difference value range.
As described above, since the zero calibration time has a certain limit, the working power of the diaphragm pump is increased during zero calibration to increase the gas flow rate in the atmospheric channel, and the air is pumped at a fixed duty ratio, and if the channel switching device (e.g. the three-way valve) is successfully switched to the atmospheric channel at this time, the pressure value of the gas channel obtained at this time has a pressure difference (which may be referred to as a first pressure difference) compared with the ambient atmospheric pressure value; if the switching to the atmosphere channel is not successful, the obtained gas channel pressure value has a pressure difference (which may be referred to as a second pressure difference) compared with the ambient atmosphere pressure value, but the second pressure difference is larger than the first pressure difference for successfully switching to the atmosphere.
For example, the specific ambient atmospheric pressure value may be P0Representing, the pressure value P of the gas path after the channel switching device is switched to the atmospheric channel during zero calibration1And is in contact with the ambient atmospheric pressure value P0Making a difference to obtain a pressure difference: Δ P ═ P0-P1. Judging whether the difference value between the ambient atmospheric pressure value and the air path pressure value is within a preset difference value range or not; when the difference value is not within the preset difference value range, performing zero calibration condition abnormity of the channel switching device; otherwise, confirming that the zero calibration condition of the channel switching device is normal.
In the present embodiment, the order of detecting whether or not the calibration conditions of the passage switching device 2 and the air extracting device 3 are abnormal is not limited, and the above description is only an example for convenience of description. The working state of the channel switching device can be detected firstly, and the working state of the air extracting device can also be detected firstly.
After the zero calibration condition of the detection channel switching device 2 and the zero calibration condition of the air extractor 3 are detected, if the zero calibration conditions are normal, the working state of hardware of the respiratory gas monitoring device can be considered to be normal, and at this time, zero calibration operation can be executed.
However, if the zero calibration is performed in the presence of signal interference, the zero reference value obtained by the zero calibration may not be accurate. Therefore, it is necessary to determine whether or not the signal is interfered. For example, an alarm message of the respiratory gas monitoring device may be obtained to determine whether there is a signal disturbance to the respiratory gas monitoring device, and the zeroing operation may be performed only if there is no signal disturbance. The respiratory waveform data detected by the respiratory gas monitoring module can be acquired; judging whether an interference signal exists according to the respiratory waveform data; and when no interference signal exists, entering a step of executing zero calibration operation.
In the zero calibration, the ambient atmosphere is used as a gas concentration zero value to obtain a standard zero reference value, so that the gas concentration in the current environment also needs to be judged before zero calibration, and CO is used2For example, to obtain CO from the ambient atmosphere2Concentration; determination of CO in ambient atmosphere2Whether the concentration is within a preset concentration range or not; when CO is in the ambient atmosphere2And when the concentration is within the preset concentration range, entering a step of executing zero calibration operation.
It should be noted that, as indicated above, the zeroing anomaly detection needs to be performed during the baseline phase of the respiration waveform; the zeroing operation is also performed when the respiratory waveform enters the baseline phase, so as to ensure the accuracy of the zeroing operation.
It will be understood by those skilled in the art that all or part of the processes of the above-described embodiments of the method may be implemented by a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the processes of the above-described embodiments of the zero-checking anomaly detection method. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A zeroing anomaly detection method for use in a respiratory gas monitoring device, wherein a gas circuit of the respiratory gas monitoring device includes an atmospheric channel, the method comprising:
acquiring a zero calibration instruction;
controlling a gas path of the breathing gas monitoring equipment to be switched to the atmospheric channel according to the zero calibration instruction; wherein the atmospheric channel is in communication with ambient atmosphere;
acquiring gas path state information of an atmospheric channel;
and determining whether the zero calibration condition of the breathing gas monitoring equipment is abnormal or not according to the gas circuit state information.
2. The zeroing anomaly detection method of claim 1, wherein the gas path state information includes at least one of a gas path pressure value or a gas path flow rate.
3. The zeroing anomaly detection method according to claim 2, wherein said breathing gas monitoring device comprises a channel switching device connected to said gas circuit;
the determining whether the zero calibration condition of the breathing gas monitoring device is abnormal according to the gas circuit state information comprises:
judging whether the air path pressure value of the atmospheric channel is within a preset range or not;
and when the air path pressure value of the atmospheric channel is not in a preset range, confirming that the zero calibration condition of the channel switching device is abnormal.
4. The method of claim 3, wherein the determining whether the air path pressure value of the atmospheric channel is within a preset range comprises:
acquiring an ambient atmospheric pressure value;
judging whether the difference value between the ambient atmospheric pressure value and the gas circuit pressure value is within a preset difference value range or not;
and when the difference value is not within the preset difference value range, confirming that the zero calibration condition of the channel switching device is abnormal.
5. The zeroing anomaly detection method according to claim 3, wherein said breathing gas monitoring device comprises an air extractor connected to said channel switching means;
the determining whether the zero calibration condition of the breathing gas monitoring device is abnormal according to the gas circuit state information comprises:
acquiring the gas path flow rate of the atmospheric channel;
judging whether the flow rate of the gas circuit is within a preset flow rate range or not;
and when the flow rate of the gas circuit is not within the preset flow rate range, confirming that the zero calibration condition of the air exhaust device is abnormal.
6. The zeroing anomaly detection method according to claim 1, characterized in that said method further comprises:
and when the zero calibration condition of the respiratory gas monitoring equipment is normal, performing zero calibration operation.
7. The zeroing anomaly detection method according to claim 1, characterized in that said method further comprises:
acquiring alarm information of the breathing gas monitoring device to determine whether signal interference exists in the breathing gas monitoring device;
performing a zeroing operation when the respiratory gas monitoring device is free of signal interference.
8. The zeroing anomaly detection method according to claim 7, further comprising:
acquiring the concentration of a preset gas in the ambient atmosphere;
judging whether the concentration of the preset gas is within a preset concentration range or not;
and when the concentration of the preset gas is within the preset concentration range, performing zero calibration operation.
9. The nulling anomaly detection method of any one of claims 1-5, 8, further comprising:
acquiring a respiratory waveform detected by the respiratory gas monitoring device;
and when the respiratory waveform enters a baseline stage, executing a step of controlling the gas circuit of the respiratory gas monitoring equipment to be switched to the atmospheric channel according to the zero calibration instruction, or executing zero calibration operation.
10. A respiratory gas monitoring device, comprising:
the gas circuit at least comprises a breathing channel and an atmosphere channel;
the air channel switching device is connected with the air channel at one end; the channel switching device is used for switching the gas circuit;
the air extracting device is connected with the other end of the channel switching device and is used for extracting air from the air channel;
a controller in communication with the channel switching device and the air extraction device,
a memory also communicatively coupled to the controller; wherein the memory stores instructions executable by the controller to cause the controller to perform the zeroing anomaly detection method of any one of claims 1-9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113827224A (en) * | 2021-08-31 | 2021-12-24 | 真健康（北京）医疗科技有限公司 | Respiratory flow information processing method and respiratory detection device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1799501A (en) * | 2005-01-05 | 2006-07-12 | 深圳迈瑞生物医疗电子股份有限公司 | Method and apparatus for monitoring human breathing mechanics parameters based on differential pressure flow sensor |
| CN102608060A (en) * | 2012-03-09 | 2012-07-25 | 深圳市理邦精密仪器股份有限公司 | High-reliability method and device for gas concentration measurement |
| CN103454379A (en) * | 2012-05-30 | 2013-12-18 | 深圳迈瑞生物医疗电子股份有限公司 | Gas measurement method and gas measurement device |
| CN104237132A (en) * | 2014-09-03 | 2014-12-24 | 深圳市理邦精密仪器股份有限公司 | Smart zero calibration method and smart zero calibration device for monitoring breathing air |
| JP2017162380A (en) * | 2016-03-11 | 2017-09-14 | 新コスモス電機株式会社 | Checking processing system of gas checking device |
| JP2018179870A (en) * | 2017-04-19 | 2018-11-15 | 株式会社テヌート | Gas concentration measuring device |
-
2019
- 2019-09-27 CN CN201910923979.2A patent/CN112577912A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1799501A (en) * | 2005-01-05 | 2006-07-12 | 深圳迈瑞生物医疗电子股份有限公司 | Method and apparatus for monitoring human breathing mechanics parameters based on differential pressure flow sensor |
| CN102608060A (en) * | 2012-03-09 | 2012-07-25 | 深圳市理邦精密仪器股份有限公司 | High-reliability method and device for gas concentration measurement |
| CN103454379A (en) * | 2012-05-30 | 2013-12-18 | 深圳迈瑞生物医疗电子股份有限公司 | Gas measurement method and gas measurement device |
| CN104237132A (en) * | 2014-09-03 | 2014-12-24 | 深圳市理邦精密仪器股份有限公司 | Smart zero calibration method and smart zero calibration device for monitoring breathing air |
| JP2017162380A (en) * | 2016-03-11 | 2017-09-14 | 新コスモス電機株式会社 | Checking processing system of gas checking device |
| JP2018179870A (en) * | 2017-04-19 | 2018-11-15 | 株式会社テヌート | Gas concentration measuring device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113827224A (en) * | 2021-08-31 | 2021-12-24 | 真健康（北京）医疗科技有限公司 | Respiratory flow information processing method and respiratory detection device |
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