CN215651107U - End-expiratory carbon dioxide simulator - Google Patents
End-expiratory carbon dioxide simulator Download PDFInfo
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- CN215651107U CN215651107U CN202121583510.8U CN202121583510U CN215651107U CN 215651107 U CN215651107 U CN 215651107U CN 202121583510 U CN202121583510 U CN 202121583510U CN 215651107 U CN215651107 U CN 215651107U
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Abstract
The utility model discloses an end-tidal carbon dioxide simulator, which structurally comprises: the device comprises a controller, a pilot-operated electromagnetic valve, an air pump, a flow regulating valve, a gas input interface, a gas output interface, a calibration interface, a power switch and a power interface, wherein the pilot-operated electromagnetic valve, the air pump and the flow regulating valve are arranged in a shell; the utility model is used as a calibration standard device for calibrating the end-tidal carbon dioxide module of a multi-parameter monitor or the end-tidal carbon dioxide monitor, the controller drives the pilot type electromagnetic valve and the air pump to alternately work according to the preset frequency of the touch screen module, and the accuracy and the response time of the concentration and the respiration rate of the end-tidal carbon dioxide are dynamically tested.
Description
Technical Field
The utility model relates to the technical field of quality detection of a multi-parameter monitor end-tidal carbon dioxide module or an end-tidal carbon dioxide monitor, in particular to an end-tidal carbon dioxide simulator.
Background
Monitoring the concentration of exhaled carbon dioxide gas may monitor the physiological condition of the patient during anesthesia and mechanical ventilation. Typically, the carbon dioxide concentration of the exhaled gas at the end of exhalation changes from 0% to 5%. Capnography is a technique for plotting the change in carbon dioxide concentration over time, and is a device that produces such traces (capnography), including a multi-parameter monitor capnography end-tidal carbon dioxide module or end-tidal carbon dioxide monitor.
Capnography has a standard pattern in healthy people, and any deviation from this pattern indicates a worsening patient condition. The accuracy of the capnography or end-tidal capnography module as a multi-parameter monitor for generating capnography is therefore of particular importance, and there is a need for periodic quality checks on these respiratory monitors.
The factory calibration of the end-tidal carbon dioxide module or the end-tidal carbon dioxide monitor of the conventional multi-parameter monitor is carried out by adopting an assembled respiration rhythm generator and an external gas cylinder according to JJJG 1163 and 2019 Multi-parameter monitoring calibration rules, but the method is only a static calibration method, has no specific dynamic test method, cannot test response time, cannot completely evaluate the performance of the end-tidal carbon dioxide module or the end-tidal carbon dioxide monitor of the multi-parameter monitor, and has many assembled test instrument components, heavy volume and inconvenience in carrying to a site for testing.
SUMMERY OF THE UTILITY MODEL
In view of the problems indicated by the background art, the present invention aims to provide an end-tidal carbon dioxide simulator, which dynamically tests the accuracy of the end-tidal carbon dioxide concentration and the respiration rate and the response time of a multi-parameter monitor or an end-tidal carbon dioxide monitor by performing analog control on the concentration of output carbon dioxide gas in a respiration process by using frequency-based regulation.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an end-tidal carbon dioxide simulator, which structurally comprises: the device comprises a controller, a pilot-operated electromagnetic valve, an air pump, a flow regulating valve, a gas input interface, a gas output interface, a calibration interface, a power switch and a power interface, wherein the pilot-operated electromagnetic valve, the air pump and the flow regulating valve are arranged in a shell; the pilot-operated solenoid valve controls the input of carbon dioxide standard gas, the input end of the pilot-operated solenoid valve is connected with the gas input interface through a 90-degree elbow, a first tee joint and a hose, and the output end of the pilot-operated solenoid valve is connected with the input end of the flow regulating valve; the output end of the air pump, the output end of the flow regulating valve and the gas output interface are connected through a second tee joint and a hose; the controller is used for controlling the simulator to operate, and is electrically connected with the pilot-operated electromagnetic valve, the air pump, the calibration interface, the power switch and the power interface.
The gas input interface is connected with a gas cylinder filled with carbon dioxide standard gas through a hose and a pressure reducing valve, and the pressure reducing valve controls the carbon dioxide standard gas to be output to the gas input interface at the pressure of 0.15 MPa.
The gas input interface adopts a quick-insertion pneumatic connector.
The gas output interface is a cylindrical gas pipe joint cast by stainless steel, the outer diameter of the gas output interface is consistent with the inner diameter of the measured multi-parameter monitor end-tidal carbon dioxide module or the measured multi-parameter monitor end-tidal carbon dioxide input standard joint, and when the gas output interface is used, the standard joint is directly inserted into the gas output interface.
The calibration interface adopts an SMA-K radio frequency connector for connecting a standard oscilloscope and is used for data tracing during the verification test.
The controller comprises a microprocessor module, a driving module, a touch screen module and a power management module, wherein the driving module is an MOS tube isolation circuit with four paths of output and is designed for low level output; the touch screen module is used for displaying the set frequency value, and is also provided with three touch keys, specifically comprising frequency adding keys, frequency subtracting keys and output enabling keys; the touch key is electrically connected with the microprocessor module; the power management module is mainly responsible for converting 24V voltage into 5V voltage, and further converting the 5V voltage into 3.3V voltage for supplying power to the microprocessor module; the microprocessor module mainly comprises a processor with the model number of STM32F103C8T6, and the driving module, the touch screen module and the power management module are electrically connected;
further, the microprocessor module is responsible for collecting a set frequency value of the touch screen module, converting the frequency value signal into a periodic pulse signal, controlling and outputting the periodic pulse signal to the driving module, and specifically, the microprocessor module controls the pilot type electromagnetic valve and the air pump to alternately work in a half period.
The frequency adding key and the frequency subtracting key are arranged on the touch screen module and used for increasing and decreasing the frequency value, pressing once and increasing or decreasing 1 time/minute, when the numerical value is adjusted greatly, the frequency value of the touch screen can be directly clicked to display the numerical value, and the design that the numerical keypad directly modifies the current respiration rate numerical value is supported.
The opening and closing state of the pilot type electromagnetic valve is opposite to the opening and closing state of the air pump.
The utility model provides an end-tidal carbon dioxide simulator, which is used as a verification calibration standard device of a multi-parameter monitor end-tidal carbon dioxide module or an end-tidal carbon dioxide monitor, and a pilot type electromagnetic valve and an air pump are driven by a controller to alternately work according to a preset frequency of a touch screen, so that the accuracy of the concentration and the respiration rate of the end-tidal carbon dioxide and the response time are dynamically tested, the operation is simple and easy to understand, the size is small, the weight is light, the device is convenient to carry to the site for verification and calibration, and certain practicability and innovation are realized.
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 are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic top view of the present invention;
FIG. 2 is a schematic view of the internal structure of the housing of the present invention;
FIG. 3 is a schematic diagram of the present invention as an etalon for performing an assay calibration test.
In fig. 1: 1. a housing; 2. a gas input interface; 3. a gas output interface; 4. calibrating the interface; 5. a power switch; 6. a power interface; 7. a touch screen module;
in fig. 2: 8. a pilot operated solenoid valve; 9. a 90-degree elbow; 10. a first tee joint; 11. a flow regulating valve; 12. a second tee joint; 13. an air pump; 14. a drive module; 15. a microprocessor module; 16. a power management module;
in fig. 3: 17: a gas cylinder; 18. a pressure reducing valve; 19. a standard oscilloscope; 20. and the end-tidal carbon dioxide module of the multi-parameter monitor to be detected.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 shown in fig. 1 and 2, the end-tidal carbon dioxide simulator in the present embodiment structurally includes: the device comprises a controller, a pilot type electromagnetic valve 8, an air pump 13, a flow regulating valve 11, a gas input interface 2, a gas output interface 3, a calibration interface 4, a power switch 5 and a power interface 6, wherein the pilot type electromagnetic valve 8, the air pump 13 and the flow regulating valve 11 are arranged in a casing 1; wherein, the pilot-operated electromagnetic valve 8 controls the input of carbon dioxide standard gas, the input end is connected with the gas input interface 2 through a 90-degree elbow 9, a first tee joint 10 and a hose, and the output end is connected with the input end of the flow regulating valve 11; the output end of the air pump 13, the output end of the flow regulating valve 11 and the gas output interface 3 are connected through a second tee joint 12 and a hose; the controller is used for controlling the simulator to operate, and is electrically connected with the pilot type electromagnetic valve 8, the air pump 13, the calibration interface 4, the power switch 5 and the power interface 6.
As shown in fig. 3, in the end-tidal carbon dioxide simulator in the present embodiment, the gas input interface 2 is connected to a gas cylinder 17 filled with carbon dioxide standard gas 18 through a hose and a pressure reducing valve, and the pressure reducing valve 18 controls the carbon dioxide standard gas to be output to the gas input interface 2 at a pressure of 0.15 MPa.
The gas input interface 2 adopts a quick-plug pneumatic connector.
The gas output interface 3 is a cylindrical gas pipe joint cast by stainless steel, the outer diameter of the gas output interface is consistent with the inner diameter of an end-tidal carbon dioxide module of the multi-parameter monitor to be detected or an input standard joint of the end-tidal carbon dioxide monitor, and when the gas output interface is used, the standard joint is directly inserted into the gas output interface 3.
The calibration interface 4 adopts an SMA-K radio frequency connector for connecting a standard oscilloscope 19 and is used for data tracing during verification test.
The flow regulating valve 11 is used for regulating the flow of the gas output by the pilot-operated solenoid valve 8;
furthermore, the measured multi-parameter monitor end-tidal carbon dioxide module or the end-tidal carbon dioxide monitor mainly detects that the standard carbon dioxide gas absorbs part of infrared energy when flowing through by an infrared light sensor arranged in a carbon dioxide probe to evaluate the concentration value of carbon dioxide, so that the flow regulating valve 11 is adopted in the embodiment to control the flow of the gas output by the pilot type electromagnetic valve 8, and the problem that the data is inaccurate in a short time in the period when the compressed air enters the air pump 13 due to the fact that the concentration of the standard carbon dioxide gas entering the measured multi-parameter monitor end-tidal carbon dioxide module or the end-tidal carbon dioxide monitor is too high is mainly solved.
The controller comprises a microprocessor module 15, a driving module 14, a touch screen module 7 and a power management module 16, wherein the driving module 14 is an MOS tube isolation circuit with four paths of output and is designed for low level output; the touch screen module 7 is configured to display a set frequency value, and the touch screen module 7 is further provided with three touch keys, specifically including a frequency adding key, a frequency subtracting key and an output enabling key; the power management module 16 is mainly responsible for converting 24V voltage into 5V voltage, and further converting 5V voltage into 3.3V voltage for supplying power to the microprocessor module 15; the microprocessor module 15 mainly comprises a processor with the model number of STM32F103C8T6, and is electrically connected with the driving module 14, the touch screen module 7 and the power management module 16;
further, the microprocessor module 15 is responsible for acquiring an output frequency value of the touch screen module 7, converting the frequency value signal into a periodic pulse signal, controlling the periodic pulse signal and outputting the periodic pulse signal to the driving module, and specifically, the microprocessor module 15 controls the pilot type electromagnetic valve 8 and the air pump 13 to alternately work in half of a period.
The frequency adding key and the frequency subtracting key arranged on the touch screen module 7 are used for increasing and decreasing the frequency value, pressing once, increasing or decreasing 1 time/minute, when the numerical value is adjusted greatly, the frequency value of the touch screen can be directly clicked to display the numerical value, and the design that the numerical keypad directly modifies the current respiration rate numerical value is supported.
The open/close state of the pilot-operated solenoid valve 8 is opposite to the open/close state of the air pump 13.
As shown in fig. 3, the end-tidal carbon dioxide simulator in this embodiment is connected in the following manner:
s1, providing a carbon dioxide standard gas cylinder 17 with 5 volume percent (balance gas is nitrogen) according to JJG 1163-2019 & lt & gt Multi-parameter Care and verification regulations, and providing a secondary decompression table 18;
s2, the decompression meter 18 is connected with the gas input interface 2 of the simulator through a hose;
s3, connecting the gas output interface 3 of the simulator with the end-tidal carbon dioxide module 20 of the multi-parameter monitor to be tested;
s4, connecting the calibration interface 4 of the simulator with the input end of a standard oscilloscope 19;
and S5, connecting the simulator power interface 6 with 220V voltage through a 24V power adapting wire.
As shown in fig. 3, in the end-tidal carbon dioxide simulator in this embodiment, an error detection of the end-tidal carbon dioxide concentration is performed:
s1, completing the equipment assembly according to the steps, and pressing the power switch 5 of the simulator;
s2, clicking the frequency value of the touch screen module 7 of the simulator, and inputting a numerical value 20 (unit times/minute) in a pop-up small keyboard window;
s3, clicking an output enabling button of a touch screen module 7 of the simulator, receiving an enabling working command by the controller, controlling the pilot type electromagnetic valve 8 and the air pump 13 to work at a frequency of 20 times/minute according to an input frequency value, and starting the simulator to work;
further, the frequency of 20 times/minute is 3 seconds each time, and the microprocessor module controls the pilot type electromagnetic valve 8 and the air pump 13 to work alternately every 1.5 seconds.
S4, after the measured multi-parameter monitor end-tidal carbon dioxide module 20 enters a normal working state, continuously reading the measurement results of 3 breaths, and calculating the end-tidal carbon dioxide concentration indicating value error according to the formula (1).
In the formula:
Δ D-end-tidal carbon dioxide concentration error, kPa (mmHg);
D0-standard value of end-tidal carbon dioxide concentration, kpa (mmhg), calculated according to formula (2) or formula (3):
as shown in fig. 3, the end-tidal carbon dioxide simulator in this embodiment performs a breath rate indication error detection:
s1, completing the equipment assembly according to the steps, and pressing the power switch 5 of the simulator;
s2, setting a frequency value of the touch screen module 7 of the simulator, setting three measuring points, and respectively setting the frequency as: 10 times/min, 20 times/min, 60 times/min;
further, the microprocessor module controls the pilot-operated solenoid valve 8 and the air pump 13 to alternately work every 3 seconds, 1.5 seconds and 0.5 second respectively.
S3, measuring the respiration rate value of the end-tidal carbon dioxide module 20 of the multi-parameter monitor to be measured for 3 times at each measuring point, and calculating the arithmetic mean value;
s4, calculating the respiratory rate indicating error according to the formula (4).
In the formula:
Δ R-respiration rate error, times/min;
R0and (4) a standard respiration rate value, which is a frequency value set by the touch screen module of the simulator, and the standard respiration rate value is subjected to data tracing through a standard oscilloscope connected with the ancient calibration interface.
Claims (10)
1. An end-tidal carbon dioxide simulator, structurally comprising: the device comprises a controller, a pilot-operated electromagnetic valve, an air pump, a flow regulating valve, a gas input interface, a gas output interface, a calibration interface, a power switch and a power interface, wherein the pilot-operated electromagnetic valve, the air pump and the flow regulating valve are arranged in a shell; the pilot-operated solenoid valve controls the input of carbon dioxide standard gas, the input end of the pilot-operated solenoid valve is connected with the gas input interface through a 90-degree elbow, a first tee joint and a hose, and the output end of the pilot-operated solenoid valve is connected with the input end of the flow regulating valve; the output end of the air pump, the output end of the flow regulating valve and the gas output interface are connected through a second tee joint and a hose; the controller is used for controlling the simulator to operate, and is electrically connected with the pilot-operated electromagnetic valve, the air pump, the calibration interface, the power switch and the power interface.
2. The end-tidal carbon dioxide simulator of claim 1, wherein the gas input port is a quick-plug pneumatic connector and is connected to a gas cylinder containing carbon dioxide standard gas through a hose and a pressure reducing valve, and the pressure reducing valve controls the carbon dioxide standard gas to be output to the gas input port at a pressure of 0.15 MPa.
3. The end-tidal carbon dioxide simulator of claim 1, wherein the gas output interface is a cylindrical gas pipe joint cast from stainless steel, the outer diameter of the gas output interface is consistent with the inner diameter of the measured multi-parameter monitor end-tidal carbon dioxide module or the standard input connector of the end-tidal carbon dioxide monitor, and when in use, the standard connector is directly inserted into the gas output interface.
4. The simulator of claim 1, wherein the calibration interface is an SMA-K rf connector for connecting to a standard oscilloscope for verifying data tracing during testing.
5. The end-tidal carbon dioxide simulator of claim 1, wherein the controller comprises a microprocessor module, a driving module, a touch screen module and a power management module, wherein the driving module is a four-way output MOS tube isolation circuit and is designed for low-level output; the touch screen module is used for displaying the set frequency value, and is also provided with three touch keys, specifically comprising frequency adding keys, frequency subtracting keys and output enabling keys; the touch key is electrically connected with the microprocessor module; the power management module is mainly responsible for converting 24V voltage into 5V voltage, and further converting the 5V voltage into 3.3V voltage for supplying power to the microprocessor module; the microprocessor module mainly comprises a processor with the model number of STM32F103C8T6, and the driving module, the touch screen module and the power management module are electrically connected;
further, the microprocessor module is responsible for collecting a set frequency value of the touch screen module, converting the frequency value signal into a periodic pulse signal, controlling and outputting the periodic pulse signal to the driving module, and specifically, the microprocessor module controls the pilot type electromagnetic valve and the air pump to alternately work in a half period.
6. The end-tidal carbon dioxide simulator of claim 5, wherein the touch screen module has frequency plus and frequency minus keys for increasing and decreasing frequency value, pressing once, increasing or decreasing 1 time/minute, and when making a larger value adjustment, the frequency value of the touch screen can be directly clicked to display a value, supporting a numeric keypad to directly modify the current breath rate value design.
7. The end-tidal carbon dioxide simulator of claim 1, wherein the pilot-operated solenoid valve is turned on and off in a manner opposite to the air pump.
8. The end-tidal carbon dioxide simulator of claim 1, wherein the flow regulating valve is used to regulate the flow of the carbon dioxide standard gas output by the pilot-operated solenoid valve.
9. The capnograph of claim 1, wherein said power source interface (6) is connected to 220V voltage via a 24V power adapting wire.
10. The device of claim 5, wherein the microprocessor module receives an output enable signal to start operation when the output enable button is pressed.
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| CN202121583510.8U CN215651107U (en) | 2021-07-14 | 2021-07-14 | End-expiratory carbon dioxide simulator |
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