WO2022141320A1 - Paramagnetic gas measurement device and medical ventilation system - Google Patents

Paramagnetic gas measurement device and medical ventilation system Download PDF

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Publication number
WO2022141320A1
WO2022141320A1 PCT/CN2020/141846 CN2020141846W WO2022141320A1 WO 2022141320 A1 WO2022141320 A1 WO 2022141320A1 CN 2020141846 W CN2020141846 W CN 2020141846W WO 2022141320 A1 WO2022141320 A1 WO 2022141320A1
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WO
WIPO (PCT)
Prior art keywords
gas
air
channel
measuring device
air gap
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PCT/CN2020/141846
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French (fr)
Chinese (zh)
Inventor
周卫东
李冲
陈之佳
袁秋
岑建
Original Assignee
深圳迈瑞生物医疗电子股份有限公司
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Application filed by 深圳迈瑞生物医疗电子股份有限公司 filed Critical 深圳迈瑞生物医疗电子股份有限公司
Priority to PCT/CN2020/141846 priority Critical patent/WO2022141320A1/en
Priority to CN202080107320.0A priority patent/CN116568352A/en
Publication of WO2022141320A1 publication Critical patent/WO2022141320A1/en

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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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids

Definitions

  • the present application relates to the technical field of gas detection, and in particular, to a paramagnetic gas measurement device and a medical ventilation system.
  • the magneto-acoustic pressure method is relatively mature and commercial products are relatively successful. Methods.
  • the measurement system of the magneto-acoustic pressure method needs to introduce the reference gas and the sample gas into the air gap at the same time for measurement.
  • current measurement systems are easily disturbed by changes in the flow rate of sample gas or reference gas, resulting in unstable measurement results.
  • the present application provides a paramagnetic gas measurement device and a medical ventilation system, which can reduce or eliminate the influence of flow changes on the paramagnetic gas concentration measurement.
  • an embodiment of the present application provides a paramagnetic gas measurement device, including:
  • a magnetic device having an air gap capable of providing a magnetic field
  • At least two gas channels wherein one of the gas channels is used to guide the reference gas to the air gap, and the other of the gas channels is used to guide the sample gas to the air gap;
  • the sensor is used to collect the gas pressure signal on the corresponding gas channel, and the gas pressure signal is used to determine the concentration of the paramagnetic gas in the sample gas;
  • each of the gas channels is provided with a first flow restricting component before the sensor, so that the difference between the gas flow rates of the different gas channels is less than or equal to the flow rate difference threshold.
  • an embodiment of the present application provides a paramagnetic gas measurement device, including:
  • a magnetic device having an air gap capable of providing a magnetic field
  • At least two gas channels wherein one of the gas channels is used to guide the reference gas to the air gap, and the other of the gas channels is used to guide the sample gas to the air gap;
  • the sensor is used to collect the gas pressure signal on the corresponding gas channel;
  • a processor connected to the sensor, for determining the concentration of the paramagnetic gas in the sample gas according to the gas pressure signal
  • each of the gas channels is provided with a first flow restricting component on the front side of the sensor, so that the difference between the gas flow rates of the different gas channels is less than or equal to the flow rate difference threshold.
  • an embodiment of the present application provides a medical ventilation system, characterized in that the medical ventilation system includes at least one gas source interface, at least one gas supply branch connected to the at least one gas source interface, and breathing circuit;
  • the at least one gas supply branch is capable of outputting gas to the breathing circuit, and the breathing circuit is connected to the aforementioned measuring device.
  • Embodiments of the present application provide a paramagnetic gas measurement device and a medical ventilation system, including at least two gas channels, which are respectively used to guide a reference gas and a sample gas to an air gap capable of providing a magnetic field, and a gas channel is provided with a gas channel for collecting
  • the gas pressure signal sensor the gas pressure signal is used to determine the concentration of the paramagnetic gas in the sample gas; by setting the flow restricting component on the gas channel, the gas flow difference of different gas channels is less than or equal to the flow difference threshold; it can Reduce or avoid the interference of sample gas or reference gas flow changes on concentration measurement, reduce or eliminate the influence of flow changes on paramagnetic gas concentration measurement.
  • FIG. 1 is a schematic structural diagram of a paramagnetic gas measurement device provided in an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a medical ventilation system provided by an embodiment of the present application.
  • 3-7 are schematic diagrams of the structure of the measuring device in different embodiments.
  • FIG. 8 is a schematic structural diagram of a paramagnetic gas measurement device provided by another embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a paramagnetic gas measurement device 100 provided by an embodiment of the present application.
  • the measurement device 100 may be used in a medical ventilation system, such as an anesthesia machine or a ventilator, for measuring oxygen concentration.
  • a medical ventilation system such as an anesthesia machine or a ventilator, for measuring oxygen concentration.
  • FIG. 2 is a schematic structural diagram of a medical ventilation system in an embodiment.
  • the medical ventilation system includes at least one gas source interface 210 , at least one gas supply branch 220 respectively connected to the at least one gas source interface 210 , and a breathing circuit 230 .
  • At least one gas supply branch 220 can output gas to the breathing circuit 230 .
  • the oxygen concentration of the gas in the breathing circuit 230 can be adjusted by controlling at least one gas supply branch 220 to output gas to the breathing circuit 230 .
  • the breathing circuit 230 is connected to the measurement device 100 of the embodiment of the present application.
  • the breathing circuit 230 is connected to the measurement device 100 through a sampling tube, and outputs sample gas to the measurement device 100 .
  • the breathing circuit 230 is connected to a gas channel of the measurement device 100 for transporting the sample gas.
  • breathing circuit 230 includes an inspiratory branch 231, an expiratory branch 232, and a main ventilation circuit 233. At least one of the inspiratory branch 231 , the expiratory branch 232 and the main ventilation air circuit 233 is connected to the measuring device 100 , and the measuring device 100 detects the oxygen concentration of the gas at the corresponding position in the breathing circuit 230 .
  • the main ventilation gas path 233 is connected to the measurement device 100 through a lower sampling tube, and part of the gas in the ventilation main gas path 233 is input to the measurement device 100 as sample gas, and the measurement device 100 measures the oxygen concentration.
  • the medical ventilation system further includes a gas control device 240, and the gas control device 240 and the breathing circuit 230 are respectively connected to at least one gas supply branch 220; the gas control device 240 controls the at least one gas supply branch 220 to output to the breathing circuit 230. gas.
  • air can be output to the breathing circuit 230 through one of the air source interfaces 210 through its gas supply branch 220 ; pure oxygen can be output to the breathing circuit 230 through the other air source interface 210 through its gas supply branch 220 .
  • the gas control device 240 can control the opening of the at least one gas supply branch 220 to adjust the oxygen concentration of the gas output to the breathing circuit 230 .
  • the medical ventilation system further includes a processor 201 , and the processor 201 may be disposed in the gas control device 240 , for example, or may also be disposed on a control board outside the gas control device 240 .
  • the processor 201 may be a micro-controller unit (Micro-controller Unit, MCU), a central processing unit (Central Processing Unit, CPU), or a digital signal processor (Digital Signal Processor, DSP) or the like.
  • MCU Micro-controller Unit
  • CPU Central Processing Unit
  • DSP Digital Signal Processor
  • the measurement device 100 is electrically connected to the gas control device 240 and/or the processor 201 and is capable of transmitting oxygen concentration data of the breathing circuit 230 to the gas control device 240 and/or the processor 201 so that the gas control device 240 and/or the processor 201 Or processor 201 adjusts the oxygen concentration of the gas output to breathing circuit 230 .
  • the measurement device 100 of the embodiment of the present application includes a magnetic device 110 , at least two gas channels 120 , and a sensor 130 disposed on the gas channels 120 .
  • the magnetic device 110 has an air gap 111 capable of providing a magnetic field.
  • the magnetic device 110 includes a permanent magnet or electromagnet with an air gap 111 capable of providing a constant magnetic field or an alternating magnetic field.
  • one of the at least two gas channels 120 is used to guide the reference gas to the air gap 111
  • the other gas channel 120 is used to guide the sample gas to the air gap 111
  • the sample gas is a gas with a concentration to be measured
  • the reference gas is a gas with a known concentration.
  • the known concentration can be 0 to 100%, such as 21%.
  • the reference gas is air.
  • the gas channel 120 is connected to a gas source of a reference gas or a gas source of a sample gas, and the gas source includes at least one of an air tank, an air pump, and an air valve.
  • the concentration of the paramagnetic gas in the sample gas can be determined according to the magneto-acoustic pressure corresponding to the reference gas and the magneto-acoustic pressure corresponding to the sample gas, for example, according to the magneto-acoustic pressure corresponding to the reference gas and the magneto-acoustic pressure corresponding to the sample gas.
  • the difference between the induced sound pressures and the concentration of the paramagnetic gas in the reference gas determines the concentration of the paramagnetic gas in the sample gas.
  • the sensor 130 disposed on the gas channel 120 is used to collect the gas pressure signal (or can be called as magneto-acoustic pressure) on the corresponding gas channel 120, and the gas pressure signal is used to determine the concentration of the paramagnetic gas in the sample gas .
  • the sensor 130 on the gas channel 120 of the reference gas is used to collect the gas pressure signal corresponding to the reference gas
  • the sensor 130 on the gas channel 120 of the sample gas is used to collect the gas pressure signal corresponding to the sample gas.
  • the gas pressure signal corresponding to the reference gas and the gas pressure signal corresponding to the sample gas can determine the concentration of the paramagnetic gas in the sample gas.
  • the senor 130 includes a sound pressure sensor 130 and/or a microphone.
  • the sensor 130 can generate an electrical signal according to the sound pressure of the air gap 111 , for example, a gas pressure signal according to a voltage caused by the sound pressure, a capacitance signal, a magnetoelectric effect, and the like.
  • the senor 130 may be disposed inside the gas channel 120 , in the side wall of the gas channel 120 , or on the inner side wall or the outer side wall of the gas channel 120 .
  • the sensor 130 may be connected to the gas channel 120 through a conductive channel capable of conducting the magneto-acoustic pressure of the gas channel 120 to the sensor 130 .
  • a conductive channel capable of conducting the magneto-acoustic pressure of the gas channel 120 to the sensor 130 .
  • one end of the conduction channel is provided with a diaphragm, the diaphragm is used to isolate the communication with the gas channel 120 and conduct the magneto-acoustic pressure to the inside of the gas channel 120, so that the sensor 130 collects the gas pressure signal through the conduction channel.
  • the air gap 111 provides an alternating magnetic field
  • the sensor 130 such as a microphone
  • the sensor 130 can output an audio signal as the gas pressure signal
  • the measurement device 100 further includes a processor 20 connected to the sensor 130 for determining the concentration of the paramagnetic gas in the sample gas according to the gas pressure signal.
  • the sensor 130 when the measurement device 100 is applied in a medical ventilation system, the sensor 130 is connected to the processor 201 in the medical ventilation system, and the processor 201 in the medical ventilation system determines the gaseous content of the sample gas according to the gas pressure signal of the sensor 130 .
  • the concentration of the magnetic gas when the measurement device 100 is applied in a medical ventilation system, the sensor 130 is connected to the processor 201 in the medical ventilation system, and the processor 201 in the medical ventilation system determines the gaseous content of the sample gas according to the gas pressure signal of the sensor 130 . The concentration of the magnetic gas.
  • the side close to the gas source interface of the channel for gas transmission is usually called the front side
  • the side away from the gas source interface and the side close to the gas outlet is called the rear side.
  • each gas channel 120 is provided with a first flow restricting component 121 before the sensor 130 , so that the difference between the gas flows of different gas channels 120 is less than or equal to the flow difference threshold.
  • the first restricting component 121 includes at least one of a restricting orifice plate and a regulating valve for restricting the flow rate and/or pressure of the gas passage 120 .
  • the restricting orifice plate includes a single-orifice plate or a multi-hole plate, and/or a single-stage or multi-stage orifice plate.
  • the first flow restricting components 121 of each gas channel 120 limit the gas flow rate through the gas channel 120 to the same value or a close range.
  • the flow rates of the reference gas and the sample gas flowing through the two gas channels 120 are made approximately equal, so as to reduce or avoid the interference of the sample gas or the flow rate of the reference gas to the concentration measurement. , reducing or eliminating the effect of flow changes on the measurement of paramagnetic gas concentrations.
  • the flow rate of the sample gas or the reference gas entering the air gap 111 can be controlled by adjusting the first restrictor assembly 121 , for example, by adjusting the number and/or size of holes in the restrictor orifice, or by adjusting the orifice plate , controls the flow rate of the sample gas or reference gas entering the air gap 111 .
  • each gas channel 120 is provided with an overflow channel 140 before the first restrictor assembly 121 .
  • the sample gas or reference gas that exceeds the flow rate limited by the first flow restricting component 121 can be discharged through the overflow channel 140 without being transmitted to the air gap 111 by the gas channel 120, which can ensure that it enters the measurement air gap
  • the reference and sample gases of 111 have nearly equal flow rates.
  • the gas passage 120 includes an intake passage 122 and a first outlet passage 123 , and the inlet passage 122 and the first outlet passage 123 are connected.
  • the air intake passage 122 and the first air outlet passage 123 may be provided separately, or may be integrally provided.
  • the connection between the intake passage 122 and the first outlet passage 123 is connected to the overflow passage 140 .
  • the overflow passage 140 may be a through hole at the connection between the air intake passage 122 and the first air outlet passage 123 .
  • a through hole is previously opened as the overflow channel 140 , so that the sample gas or the reference gas exceeding the limited flow rate of the first flow restricting component 121 can be discharged through the overflow channel 140 .
  • the overflow passage 140 may be an air passage passage, one end of which is connected to the connection between the air inlet passage 122 and the first air outlet passage 123. A part of the gas in the inlet passage 122 is transmitted to the air gap 111 through the first outlet passage 123 , and the gas exceeding the flow rate limited by the first restrictor assembly 121 is discharged through the overflow passage 140 .
  • the overflow channels 140 of the at least two gas channels 120 communicate with a second gas outlet channel 150 .
  • the sample gas and/or the reference gas exceeding the flow rate limited by the first restrictor assembly 121 are transmitted through the overflow channel 140 to the second gas outlet channel 150 to be merged, and then discharged from the second gas outlet channel 150 . Therefore, the gas exceeding the limited flow rate can be discharged from a second gas outlet channel 150, thereby simplifying the structure of the device.
  • overflow channel 140 and the second air outlet channel 150 may be integrally provided, or may be provided separately.
  • a second restrictor assembly 151 is disposed on the second air outlet channel 150 . After the sample gas and/or the reference gas exceeding the flow rate limited by the first restrictor assembly 121 are merged in the second air outlet channel 150, the flow of the sample gas and/or the reference gas is restricted by the second flow restrictor assembly 151, and at least part of the sample gas and/or reference gas flows from the second air outlet channel 150 discharge.
  • the second restricting component 151 includes at least one of a restricting orifice plate and a regulating valve, for restricting the flow and/or pressure of the second air outlet channel 150 .
  • the restricting orifice plate includes a single-orifice plate or a multi-hole plate, and/or a single-stage or multi-stage orifice plate.
  • the second air outlet channel 150 is provided with a differential pressure sensor 152 before the second restrictor assembly 151 , and the differential pressure sensor 152 is used to collect the pressure between the second air outlet channel 150 and the air gap 111 .
  • the air pressure difference is used in conjunction with the gas pressure signal to determine the concentration of the paramagnetic gas in the sample gas.
  • the differential pressure sensor 152 includes two input ports, one of which is communicated with the air gap 111 , and the other input port is communicated with the second air outlet channel 150 , and the communication point is located at the second flow restriction of the second air outlet channel 150 . before component 151.
  • one input port is connected to one end of a pipeline, and the other end of the pipeline is arranged close to the air gap 111; the other input port is connected to one end of another pipeline, and the other end of the pipeline is connected to the second The air outlet passages 150 are connected, and the connection is located before the second restrictor element 151 of the second air outlet passage 150 .
  • the differential pressure sensor 152 is used to collect the air pressure difference between the air pressure at the connection between the second air outlet channel 150 and the overflow channel 140 and the air pressure at the air gap 111 .
  • an input port of the differential pressure sensor 152 is connected to the second air outlet channel 150 and the overflow channel 140 through a pipeline.
  • the air pressure difference between the second air outlet channel 150 and the air gap 111 can represent the change of the flow rate of the sample gas and the reference gas, and the influence of the flow change on the measurement result can be compensated according to the air pressure difference.
  • the sensor 130 is connected to the processor 20 of the measuring device 100 or to the processor 201 in the medical ventilation system.
  • the air pressure difference determines the concentration of paramagnetic gas in the sample gas, and the measurement results are more accurate.
  • the processor 20 and/or the processor 201 may determine the compensation amount corresponding to the air pressure difference measured by the differential pressure sensor 152 according to the preset mapping relationship between the air pressure difference and the compensation amount, and according to the compensation amount The concentration determined by the gas pressure signal of 130 is corrected.
  • a constant pressure component 153 is provided on the second air outlet channel 150 , and the constant pressure component 153 is used to maintain the air pressure difference between the second air outlet channel 150 and the air gap 111 to be less than or equal to the pressure difference value threshold.
  • the constant pressure assembly 153 includes a constant pressure valve and/or a constant pressure pump.
  • the constant pressure component 153 can ensure that the pressure difference between the two sides of the constant pressure component 153 changes very little by controlling the flow rate through the second gas outlet channel 150, so as to ensure that the pressure difference between the two sides of the constant pressure component 153 changes little.
  • the air pressure difference between the second air outlet channel 150 and the air gap 111 changes very little, within an acceptable range , so that the change in the flow rate transmitted through the gas channel 120 to the air gap 111 is small and within an acceptable range, thereby reducing or eliminating the influence of the change in the flow rate of the sample gas and the reference gas on the oxygen concentration measurement.
  • the measuring device 100 includes a housing 10 , and the housing 10 is provided with at least two air inlets 11 and at least one air outlet 12 , and at least two air inlets 11 are provided on the housing 10 .
  • both the air gap 111 and the overflow passage 140 are in communication with the gas outlet 12 .
  • the sample gas and the reference gas enter the measuring device 100 through the two gas inlets 11 , and the gas transmitted to the air gap 111 and the gas discharged through the overflow channel 140 can be discharged through the gas outlet 12 .
  • the housing 10 has a chamber 13 .
  • the magnetic device 110 , the sensor 130 and the first restrictor assembly 121 are disposed in the chamber 13 , and the gas channel 120 extends to the outside of the housing 10 .
  • the gas channel 120 extends to the outside of the housing 10 to form the gas inlet 11 , and the sample gas and the reference gas are transmitted from the gas channel 120 to the air gap 111 of the magnetic device 110 through the two gas inlets 11 to generate magneto-acoustics.
  • the air gap 111 is located in the chamber 13, so the gas passing through the air gap 111 is contained in the chamber 13;
  • the sample gas and/or the reference gas is discharged into the chamber 13 through the overflow channel 140 , and the gas in the chamber 13 is discharged from the measuring device 100 through the gas outlet 12 on the housing 10 .
  • the air gap 111 communicates with the overflow channel 140 .
  • the air gap 111 and the overflow channel 140 communicate through the chamber 13 .
  • the chamber 13 communicates with the air outlet 12 on the housing 10, the gas passing through the air gap 111 is contained in the chamber 13, the gas discharged through the overflow channel 140 is also contained in the chamber 13, and the gas in the chamber 13 passes through the chamber 13.
  • the air outlet 12 on the housing 10 exits the measuring device 100 .
  • both the air gap 111 and the second air outlet channel 150 communicate with the chamber 13 , for example, the air gap 111 and the second air outlet channel 150 connected with the overflow channel 140 communicate with each other.
  • the air gap 111 and the second air outlet channel 150 are communicated through the chamber 13 .
  • the gas passing through the air gap 111 is contained in the chamber 13
  • the gas discharged through the overflow channel 140 is discharged into the chamber 13 after the second gas outlet channel 150 is merged, and the gas in the chamber 13 passes through the gas on the casing 10 .
  • the air outlet 12 exits the measuring device 100 .
  • the paramagnetic gas measurement device includes at least two gas channels, which are respectively used to guide the reference gas and the sample gas to an air gap capable of providing a magnetic field.
  • the gas channel is provided with a sensor for collecting gas pressure signals.
  • the pressure signal is used to determine the concentration of the paramagnetic gas in the sample gas; by setting the restrictor component on the gas channel, the difference of the gas flow of different gas channels is less than or equal to the flow difference threshold; it can reduce or avoid the sample gas or reference Gas flow changes interfere with concentration measurement, reduce or eliminate the influence of flow changes on paramagnetic gas concentration measurement.
  • FIG. 8 is a schematic structural diagram of a paramagnetic gas measurement device 100 provided by another embodiment of the present application.
  • the measurement device 100 includes:
  • a magnetic device 110 having an air gap 111 capable of providing a magnetic field
  • At least two gas channels 120 wherein one of the gas channels 120 is used for guiding the reference gas to the air gap 111, and the other gas channel 120 is used for guiding the sample gas to the air gap 111;
  • the sensor 130 is used to collect the gas pressure signal on the corresponding gas channel 120;
  • the processor 20 is connected to the sensor 130 for determining the concentration of the paramagnetic gas in the sample gas according to the gas pressure signal;
  • each of the gas channels 120 is provided with a first flow restricting component 121 on the front side of the sensor 130 , so that the difference between the gas flows of different gas channels 120 is less than or equal to the flow difference threshold.
  • the processor 20 may be a micro-controller unit (Micro-controller Unit, MCU), a central processing unit (Central Processing Unit, CPU), or a digital signal processor (Digital Signal Processor, DSP), or the like.
  • MCU Micro-controller Unit
  • CPU Central Processing Unit
  • DSP Digital Signal Processor
  • FIG. 2 is a schematic structural diagram of a medical ventilation system provided by another embodiment of the present application.
  • the medical ventilation system includes at least one gas source interface 210 , at least one gas supply branch 220 respectively connected to the at least one gas source interface 210 , and a breathing circuit 230 .
  • At least one gas supply branch 220 can output gas to the breathing circuit 230 .
  • the oxygen concentration of the gas in the breathing circuit 230 can be adjusted by controlling at least one gas supply branch 220 to output gas to the breathing circuit 230 .
  • the breathing circuit 230 is connected to the measuring device 100 of the foregoing embodiment.
  • the breathing circuit 230 is connected to the measurement device 100 through a sampling tube, and outputs sample gas to the measurement device 100 .
  • the breathing circuit 230 is connected to a gas channel of the measurement device 100 for transporting the sample gas.
  • breathing circuit 230 includes an inspiratory branch 231 , an expiratory branch 232 and a main ventilation circuit 233 . At least one of the inspiratory branch 231 , the expiratory branch 232 and the main ventilation air circuit 233 is connected to the measuring device 100 , and the measuring device 100 detects the oxygen concentration of the gas at the corresponding position in the breathing circuit 230 .
  • the main ventilation gas path 233 is connected to the measurement device 100 through a lower sampling tube, and part of the gas in the ventilation main gas path 233 is input to the measurement device 100 as sample gas, and the measurement device 100 measures the oxygen concentration.
  • the medical ventilation system further includes a gas control device 240, and the gas control device 240 and the breathing circuit 230 are respectively connected to at least one gas supply branch 220; the gas control device 240 controls the at least one gas supply branch 220 to output to the breathing circuit 230. gas.
  • air can be output to the breathing circuit 230 through one of the air source interfaces 210 through its gas supply branch 220; pure oxygen can be output to the breathing circuit 230 through the other air source interface 210 through its gas supply branch 220.
  • the gas control device 240 can control the opening of the at least one gas supply branch 220 to adjust the oxygen concentration of the gas output to the breathing circuit 230 .
  • the medical ventilation system further includes a processor 201 , and the processor 201 may be disposed in the gas control device 240 , for example, or may also be disposed on a control board outside the gas control device 240 .
  • the processor 201 may be a micro-controller unit (Micro-controller Unit, MCU), a central processing unit (Central Processing Unit, CPU), or a digital signal processor (Digital Signal Processor, DSP) or the like.
  • MCU Micro-controller Unit
  • CPU Central Processing Unit
  • DSP Digital Signal Processor
  • the measurement device 100 is electrically connected to the gas control device 240 and/or the processor 201 and is capable of transmitting oxygen concentration data of the breathing circuit 230 to the gas control device 240 and/or the processor 201 so that the gas control device 240 and/or the processor 201 Or processor 201 adjusts the oxygen concentration of the gas output to breathing circuit 230 .
  • the difference between the gas flows of different gas channels is less than or equal to the flow difference threshold; the sample gas or reference gas can be reduced or avoided.
  • the interference of the flow change on the concentration measurement can reduce or eliminate the influence of the flow change on the measurement of the paramagnetic gas concentration, thereby improving the safety and reliability of the medical ventilation system.

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Abstract

A paramagnetic gas measurement device, comprising: a magnetic device which has an air gap; at least two gas channels, wherein one gas channel is used to guide a reference gas to the air gap, and the other gas channel is used to guide a sample gas to the air gap; and sensors arranged on the gas channels for use in collecting gas pressure signals on the corresponding gas channels, wherein the gas pressure signals are used to determine the concentration of a paramagnetic gas in the sample gas, and each gas channel is provided with a first current limiting assembly in front of the sensor, so that the difference between gas flows of different gas channels is less than or equal to a flow difference threshold. In the present application, the interference that sample gas or reference gas flow changes has on concentration measurement may be reduced or avoided, and the influence of flow changes on paramagnetic gas concentration measurement may be reduced or eliminated. Also provided is a medical ventilation system.

Description

顺磁气体的测量装置和医疗通气***Measurement devices for paramagnetic gases and medical ventilation systems 技术领域technical field
本申请涉及气体检测技术领域，尤其涉及一种顺磁气体的测量装置和医疗通气***。The present application relates to the technical field of gas detection, and in particular, to a paramagnetic gas measurement device and a medical ventilation system.
背景技术Background technique
利用顺磁气体分子，如氧分子的顺磁特性对混合气体中的顺磁气体浓度进行测量是一种快速实时可靠的测量方法，其中磁致声压法是其中比较成熟，商业化产品比较成功的方法。磁致声压法的测量***需将参考气体和样本气体同时引入气隙进行测量。但是目前的测量***容易受样本气体或者参考气体流量变化的干扰，使得测量结果不稳定。Using the paramagnetic properties of paramagnetic gas molecules, such as oxygen molecules, to measure the paramagnetic gas concentration in mixed gas is a fast, real-time and reliable measurement method. Among them, the magneto-acoustic pressure method is relatively mature and commercial products are relatively successful. Methods. The measurement system of the magneto-acoustic pressure method needs to introduce the reference gas and the sample gas into the air gap at the same time for measurement. However, current measurement systems are easily disturbed by changes in the flow rate of sample gas or reference gas, resulting in unstable measurement results.
发明内容SUMMARY OF THE INVENTION
本申请提供了一种顺磁气体的测量装置和医疗通气***，能够降低或消除流量变化对顺磁气体浓度测量的影响。The present application provides a paramagnetic gas measurement device and a medical ventilation system, which can reduce or eliminate the influence of flow changes on the paramagnetic gas concentration measurement.
第一方面，本申请实施例提供了一种顺磁气体的测量装置，包括：In a first aspect, an embodiment of the present application provides a paramagnetic gas measurement device, including:
磁性装置，所述磁性装置具有能够提供磁场的气隙；a magnetic device having an air gap capable of providing a magnetic field;
至少两个气体通道，其中一个所述气体通道用于将参考气体导向所述气隙，另一个所述气体通道用于将样本气体导向所述气隙；at least two gas channels, wherein one of the gas channels is used to guide the reference gas to the air gap, and the other of the gas channels is used to guide the sample gas to the air gap;
设置在所述气体通道上的传感器，所述传感器用于采集对应的气体通道上的气体压力信号，所述气体压力信号用于确定样本气体中顺磁气体的浓度；a sensor arranged on the gas channel, the sensor is used to collect the gas pressure signal on the corresponding gas channel, and the gas pressure signal is used to determine the concentration of the paramagnetic gas in the sample gas;
其中，各所述气体通道在所述传感器之前设置有第一限流组件，以使不同气体通道的气体流量的差值小于或等于流量差值阈值。Wherein, each of the gas channels is provided with a first flow restricting component before the sensor, so that the difference between the gas flow rates of the different gas channels is less than or equal to the flow rate difference threshold.
第二方面，本申请实施例提供了一种顺磁气体的测量装置，包括：In a second aspect, an embodiment of the present application provides a paramagnetic gas measurement device, including:
磁性装置，所述磁性装置具有能够提供磁场的气隙；a magnetic device having an air gap capable of providing a magnetic field;
至少两个气体通道，其中一个所述气体通道用于将参考气体导向所述气隙，另一个所述气体通道用于将样本气体导向所述气隙；at least two gas channels, wherein one of the gas channels is used to guide the reference gas to the air gap, and the other of the gas channels is used to guide the sample gas to the air gap;
设置在所述气体通道上的传感器，所述传感器用于采集对应的气体通道上的气体压力信号；a sensor arranged on the gas channel, the sensor is used to collect the gas pressure signal on the corresponding gas channel;
处理器，所述处理器连接所述传感器，用于根据所述气体压力信号确定样本气体中顺磁气体的浓度；a processor, connected to the sensor, for determining the concentration of the paramagnetic gas in the sample gas according to the gas pressure signal;
其中，各所述气体通道在所述传感器的前侧设置有第一限流组件，以使不同气体通道的气体流量的差值小于或等于流量差值阈值。Wherein, each of the gas channels is provided with a first flow restricting component on the front side of the sensor, so that the difference between the gas flow rates of the different gas channels is less than or equal to the flow rate difference threshold.
第三方面，本申请实施例提供了一种医疗通气***,其特征在于，所述医疗通气***包括至少一个气源接口、分别与所述至少一个气源接口连接的至少一个气体供应支路和呼吸回路；In a third aspect, an embodiment of the present application provides a medical ventilation system, characterized in that the medical ventilation system includes at least one gas source interface, at least one gas supply branch connected to the at least one gas source interface, and breathing circuit;
其中，所述至少一个气体供应支路能够向所述呼吸回路输出气体，所述呼吸回路连接前述的测量装置。Wherein, the at least one gas supply branch is capable of outputting gas to the breathing circuit, and the breathing circuit is connected to the aforementioned measuring device.
本申请实施例提供了一种顺磁气体的测量装置和医疗通气***，包括至少两个气体通道，分别用于将参考气体和样本气体导向能够提供磁场的气隙，气体通道上设有用于采集气体压力信号的传感器，气体压力信号用于确定样本气体中顺磁气体的浓度；通过在气体通道上设置限流组件，使不同气体通道的气体流量的差值小于或等于流量差值阈值；能够降低或避免样本气体或者参考气体流量变化的对浓度测量的干扰，降低或消除流量变化对顺磁气体浓度测量的影响。Embodiments of the present application provide a paramagnetic gas measurement device and a medical ventilation system, including at least two gas channels, which are respectively used to guide a reference gas and a sample gas to an air gap capable of providing a magnetic field, and a gas channel is provided with a gas channel for collecting The gas pressure signal sensor, the gas pressure signal is used to determine the concentration of the paramagnetic gas in the sample gas; by setting the flow restricting component on the gas channel, the gas flow difference of different gas channels is less than or equal to the flow difference threshold; it can Reduce or avoid the interference of sample gas or reference gas flow changes on concentration measurement, reduce or eliminate the influence of flow changes on paramagnetic gas concentration measurement.
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本申请实施例的公开内容。It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the disclosure of the embodiments of the present application.
附图说明Description of drawings
为了更清楚地说明本申请实施例的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to explain the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.
图1是本申请实施例提供的一种顺磁气体的测量装置的结构示意图；1 is a schematic structural diagram of a paramagnetic gas measurement device provided in an embodiment of the present application;
图2是本申请实施例提供的一种医疗通气***的结构示意图；2 is a schematic structural diagram of a medical ventilation system provided by an embodiment of the present application;
图3-图7是不同实施方式中测量装置的结构示意图；3-7 are schematic diagrams of the structure of the measuring device in different embodiments;
图8是本申请另一实施例提供的一种顺磁气体的测量装置的结构示意图。FIG. 8 is a schematic structural diagram of a paramagnetic gas measurement device provided by another embodiment of the present application.
具体实施方式Detailed ways
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
附图中所示的流程图仅是示例说明，不是必须包括所有的内容和操作/步骤，也不是必须按所描述的顺序执行。例如，有的操作/步骤还可以分解、组合或部分合并，因此实际执行的顺序有可能根据实际情况改变。The flowcharts shown in the figures are for illustration only, and do not necessarily include all contents and operations/steps, nor do they have to be performed in the order described. For example, some operations/steps can also be decomposed, combined or partially combined, so the actual execution order may be changed according to the actual situation.
下面结合附图，对本申请的一些实施方式作详细说明。在不冲突的情况下，下述的实施例及实施例中的特征可以相互组合。Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and features in the embodiments may be combined with each other without conflict.
请参阅图1，图1是本申请实施例提供的一种顺磁气体的测量装置100的结构示意图。Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of a paramagnetic gas measurement device 100 provided by an embodiment of the present application.
在一些实施方式中，测量装置100可以用于医疗通气***中，如麻醉机或呼吸机中，用于测量氧气浓度。In some embodiments, the measurement device 100 may be used in a medical ventilation system, such as an anesthesia machine or a ventilator, for measuring oxygen concentration.
如图2所示为一实施方式中的医疗通气***的结构示意图。该医疗通气***包括至少一个气源接口210、分别与至少一个气源接口210连接的至少一个气体供应支路220、以及呼吸回路230。FIG. 2 is a schematic structural diagram of a medical ventilation system in an embodiment. The medical ventilation system includes at least one gas source interface 210 , at least one gas supply branch 220 respectively connected to the at least one gas source interface 210 , and a breathing circuit 230 .
具体的，至少一个气体供应支路220能够向呼吸回路230输出气体。可以通过控制至少一个气体供应支路220向呼吸回路230输出气体，以调整呼吸回路230的气体的氧浓度。Specifically, at least one gas supply branch 220 can output gas to the breathing circuit 230 . The oxygen concentration of the gas in the breathing circuit 230 can be adjusted by controlling at least one gas supply branch 220 to output gas to the breathing circuit 230 .
其中，呼吸回路230连接本申请实施例的测量装置100。The breathing circuit 230 is connected to the measurement device 100 of the embodiment of the present application.
示例性的，呼吸回路230通过一采样管连接测量装置100，向测量装置100输出样本气体。例如，呼吸回路230连接测量装置100的用于传输样本气体的气体通道。Exemplarily, the breathing circuit 230 is connected to the measurement device 100 through a sampling tube, and outputs sample gas to the measurement device 100 . For example, the breathing circuit 230 is connected to a gas channel of the measurement device 100 for transporting the sample gas.
在一些实施方式中，呼吸回路230包括吸气支路231、呼气支路232和通 气主气路233。吸气支路231、呼气支路232和通气主气路233中的至少一个连接测量装置100，由测量装置100检测呼吸回路230中相应位置气体的氧浓度。In some embodiments, breathing circuit 230 includes an inspiratory branch 231, an expiratory branch 232, and a main ventilation circuit 233. At least one of the inspiratory branch 231 , the expiratory branch 232 and the main ventilation air circuit 233 is connected to the measuring device 100 , and the measuring device 100 detects the oxygen concentration of the gas at the corresponding position in the breathing circuit 230 .
示例性的，如图2所示，通气主气路233通过一下采样管连接测量装置100，通气主气路233中的部分气体作为样本气体输入测量装置100，由测量装置100测量氧浓度。Exemplarily, as shown in FIG. 2 , the main ventilation gas path 233 is connected to the measurement device 100 through a lower sampling tube, and part of the gas in the ventilation main gas path 233 is input to the measurement device 100 as sample gas, and the measurement device 100 measures the oxygen concentration.
示例性的，医疗通气***还包括气体控制装置240，气体控制装置240和呼吸回路230分别与至少一个气体供应支路220连接；气体控制装置240控制至少一个气体供应支路220输出到呼吸回路230的气体。Exemplarily, the medical ventilation system further includes a gas control device 240, and the gas control device 240 and the breathing circuit 230 are respectively connected to at least one gas supply branch 220; the gas control device 240 controls the at least one gas supply branch 220 to output to the breathing circuit 230. gas.
示例性的，空气可以通过其中一个气源接口210经其气体供应支路220输出到呼吸回路230；纯氧可以通过另一个气源接口210经其气体供应支路220输出到呼吸回路230。Exemplarily, air can be output to the breathing circuit 230 through one of the air source interfaces 210 through its gas supply branch 220 ; pure oxygen can be output to the breathing circuit 230 through the other air source interface 210 through its gas supply branch 220 .
示例性的，气体控制装置240能够控制至少一个气体供应支路220的开度，以调节输出到呼吸回路230的气体的氧浓度。Exemplarily, the gas control device 240 can control the opening of the at least one gas supply branch 220 to adjust the oxygen concentration of the gas output to the breathing circuit 230 .
在一些实施方式中，医疗通气***还包括处理器201，处理器201例如可以设置在气体控制装置240中，或者也可以设置在气体控制装置240之外的控制板上。In some embodiments, the medical ventilation system further includes a processor 201 , and the processor 201 may be disposed in the gas control device 240 , for example, or may also be disposed on a control board outside the gas control device 240 .
具体地，处理器201可以是微控制单元(Micro-controller Unit，MCU)、中央处理单元(Central Processing Unit，CPU)或数字信号处理器(Digital Signal Processor，DSP)等。Specifically, the processor 201 may be a micro-controller unit (Micro-controller Unit, MCU), a central processing unit (Central Processing Unit, CPU), or a digital signal processor (Digital Signal Processor, DSP) or the like.
示例性的，测量装置100与气体控制装置240和/或处理器201电连接，能够将呼吸回路230的氧浓度数据传输给气体控制装置240和/或处理器201，以便气体控制装置240和/或处理器201调节输出到呼吸回路230的气体的氧浓度。Exemplarily, the measurement device 100 is electrically connected to the gas control device 240 and/or the processor 201 and is capable of transmitting oxygen concentration data of the breathing circuit 230 to the gas control device 240 and/or the processor 201 so that the gas control device 240 and/or the processor 201 Or processor 201 adjusts the oxygen concentration of the gas output to breathing circuit 230 .
如图1所示，本申请实施例的测量装置100包括磁性装置110、至少两个气体通道120，以及设置在气体通道120上的传感器130。As shown in FIG. 1 , the measurement device 100 of the embodiment of the present application includes a magnetic device 110 , at least two gas channels 120 , and a sensor 130 disposed on the gas channels 120 .
其中，磁性装置110具有能够提供磁场的气隙111。The magnetic device 110 has an air gap 111 capable of providing a magnetic field.
示例性的，磁性装置110包括永磁体或者电磁铁，具有能够提供恒定磁场或交变磁场的气隙111。Illustratively, the magnetic device 110 includes a permanent magnet or electromagnet with an air gap 111 capable of providing a constant magnetic field or an alternating magnetic field.
如图1所示，至少两个气体通道120中的一个气体通道120用于将参考气体导向气隙111，另一个气体通道120用于将样本气体导向气隙111。其中，样本气体为待测浓度的气体，参考气体为已知浓度的气体，已知浓度可以为0至 100％，例如为21％，举例而言，参考气体为空气。具体的，气体通道120连接参考气体的气源或连接样本气体的气源，气源包括气罐、气泵、气阀中的至少一种。As shown in FIG. 1 , one of the at least two gas channels 120 is used to guide the reference gas to the air gap 111 , and the other gas channel 120 is used to guide the sample gas to the air gap 111 . The sample gas is a gas with a concentration to be measured, and the reference gas is a gas with a known concentration. The known concentration can be 0 to 100%, such as 21%. For example, the reference gas is air. Specifically, the gas channel 120 is connected to a gas source of a reference gas or a gas source of a sample gas, and the gas source includes at least one of an air tank, an air pump, and an air valve.
在参考气体和样本气体向气隙111传输时，在磁场作用下产生声压的变化，可以称为磁致声压。在磁场保持一定时，不同浓度的气体引起的磁致声压不同，因此可以根据检测的磁致声压确定气体中顺磁气体的浓度。示例性的，可以根据参考气体对应的磁致声压和样本气体对应的磁致声压，确定样本气体中顺磁气体的浓度，例如根据参考气体对应的磁致声压和样本气体对应的磁致声压之间的差值，以及参考气体中顺磁气体的浓度，确定样本气体中顺磁气体的浓度。When the reference gas and the sample gas are transmitted to the air gap 111, a change in sound pressure is generated under the action of the magnetic field, which can be called magneto-induced sound pressure. When the magnetic field is kept constant, the magneto-acoustic pressure caused by different concentrations of gas is different, so the concentration of paramagnetic gas in the gas can be determined according to the detected magneto-acoustic pressure. Exemplarily, the concentration of the paramagnetic gas in the sample gas can be determined according to the magneto-acoustic pressure corresponding to the reference gas and the magneto-acoustic pressure corresponding to the sample gas, for example, according to the magneto-acoustic pressure corresponding to the reference gas and the magneto-acoustic pressure corresponding to the sample gas. The difference between the induced sound pressures and the concentration of the paramagnetic gas in the reference gas determines the concentration of the paramagnetic gas in the sample gas.
具体的，设置在气体通道120上的传感器130用于采集对应的气体通道120上的气体压力信号(或可称为磁致声压)，气体压力信号用于确定样本气体中顺磁气体的浓度。Specifically, the sensor 130 disposed on the gas channel 120 is used to collect the gas pressure signal (or can be called as magneto-acoustic pressure) on the corresponding gas channel 120, and the gas pressure signal is used to determine the concentration of the paramagnetic gas in the sample gas .
如图1所示，参考气体的气体通道120上的传感器130用于采集参考气体对应的气体压力信号，样本气体的气体通道120上的传感器130用于采集样本气体对应的气体压力信号，根据采集参考气体对应的气体压力信号和样本气体对应的气体压力信号可以确定样本气体中顺磁气体的浓度。As shown in FIG. 1 , the sensor 130 on the gas channel 120 of the reference gas is used to collect the gas pressure signal corresponding to the reference gas, and the sensor 130 on the gas channel 120 of the sample gas is used to collect the gas pressure signal corresponding to the sample gas. The gas pressure signal corresponding to the reference gas and the gas pressure signal corresponding to the sample gas can determine the concentration of the paramagnetic gas in the sample gas.
示例性的，传感器130包括声压传感器130和/或麦克风。传感器130能够根据气隙111的声压生成电信号，例如根据声压引起的电压、电容信号、磁电效应等生成气体压力信号。Illustratively, the sensor 130 includes a sound pressure sensor 130 and/or a microphone. The sensor 130 can generate an electrical signal according to the sound pressure of the air gap 111 , for example, a gas pressure signal according to a voltage caused by the sound pressure, a capacitance signal, a magnetoelectric effect, and the like.
示例性的，传感器130可以设置在气体通道120的内部、设置在气体通道120的侧壁中或者设置在气体通道120的内侧壁上或外侧壁上。在一些实施方式中，传感器130可以通过一传导通道连接气体通道120，该传导通道能够将气体通道120的磁致声压传导给传感器130。示例性的，传导通道的一端设有隔膜，隔膜用于隔绝与气体通道120的连通，以及将磁致声压传导给气体通道120内部，以便传感器130通过传导通道采集气体压力信号。For example, the sensor 130 may be disposed inside the gas channel 120 , in the side wall of the gas channel 120 , or on the inner side wall or the outer side wall of the gas channel 120 . In some embodiments, the sensor 130 may be connected to the gas channel 120 through a conductive channel capable of conducting the magneto-acoustic pressure of the gas channel 120 to the sensor 130 . Exemplarily, one end of the conduction channel is provided with a diaphragm, the diaphragm is used to isolate the communication with the gas channel 120 and conduct the magneto-acoustic pressure to the inside of the gas channel 120, so that the sensor 130 collects the gas pressure signal through the conduction channel.
示例性的，磁性装置110包括电磁铁时，气隙111提供交变磁场，传感器130，如麦克风可以输出音频信号作为气体压力信号。Exemplarily, when the magnetic device 110 includes an electromagnet, the air gap 111 provides an alternating magnetic field, and the sensor 130, such as a microphone, can output an audio signal as the gas pressure signal.
在一些实施方式中，如图8所示，测量装置100还包括处理器20，该处理器20连接传感器130，用于根据气体压力信号确定样本气体中顺磁气体的浓度。In some embodiments, as shown in FIG. 8 , the measurement device 100 further includes a processor 20 connected to the sensor 130 for determining the concentration of the paramagnetic gas in the sample gas according to the gas pressure signal.
在另一些实施方式中，测量装置100应用于医疗通气***中时，传感器130 连接医疗通气***中的处理器201，医疗通气***中的处理器201根据传感器130的气体压力信号确定样本气体中顺磁气体的浓度。In other embodiments, when the measurement device 100 is applied in a medical ventilation system, the sensor 130 is connected to the processor 201 in the medical ventilation system, and the processor 201 in the medical ventilation system determines the gaseous content of the sample gas according to the gas pressure signal of the sensor 130 . The concentration of the magnetic gas.
为便于说明，用于传输气体的通道通常将靠近气源接口的一侧称为前侧，将远离气源接口，靠近用于出气的一侧称为后侧。For the convenience of description, the side close to the gas source interface of the channel for gas transmission is usually called the front side, and the side away from the gas source interface and the side close to the gas outlet is called the rear side.
具体的，如图1所示，各气体通道120在传感器130之前设置有第一限流组件121，以使不同气体通道120的气体流量的差值小于或等于流量差值阈值。Specifically, as shown in FIG. 1 , each gas channel 120 is provided with a first flow restricting component 121 before the sensor 130 , so that the difference between the gas flows of different gas channels 120 is less than or equal to the flow difference threshold.
示例性的，第一限流组件121包括限流孔板、调节阀中的至少一种，用于限定气体通道120的流量和/或压力。其中，限流孔板包括单孔板或多孔板，和/或包括单级或多级的孔板。Exemplarily, the first restricting component 121 includes at least one of a restricting orifice plate and a regulating valve for restricting the flow rate and/or pressure of the gas passage 120 . Wherein, the restricting orifice plate includes a single-orifice plate or a multi-hole plate, and/or a single-stage or multi-stage orifice plate.
示例性的，各气体通道120的第一限流组件121将通过气体通道120的气体流量限定在相同的数值或者接近的范围。请参见图1，通过相同的第一限流组件121，使两个气体通道120流过的参考气体和样本气体的流量大致相等，降低或避免样本气体或者参考气体流量变化的对浓度测量的干扰，降低或消除流量变化对顺磁气体浓度测量的影响。Exemplarily, the first flow restricting components 121 of each gas channel 120 limit the gas flow rate through the gas channel 120 to the same value or a close range. Referring to FIG. 1 , through the same first restrictor assembly 121 , the flow rates of the reference gas and the sample gas flowing through the two gas channels 120 are made approximately equal, so as to reduce or avoid the interference of the sample gas or the flow rate of the reference gas to the concentration measurement. , reducing or eliminating the effect of flow changes on the measurement of paramagnetic gas concentrations.
在一些实施方式中，可以通过调节第一限流组件121来控制进入气隙111的样本气体或者参考气体的流量，例如通过调节限流孔板上孔的数量和/或大小，或者调节孔板的级数，控制进入气隙111的样本气体或者参考气体的流量。In some embodiments, the flow rate of the sample gas or the reference gas entering the air gap 111 can be controlled by adjusting the first restrictor assembly 121 , for example, by adjusting the number and/or size of holes in the restrictor orifice, or by adjusting the orifice plate , controls the flow rate of the sample gas or reference gas entering the air gap 111 .
在一些实施方式中，如图3所示，各气体通道120在第一限流组件121之前设置有溢流通道140。样本气体或者参考气体流量变化时，超出第一限流组件121限定流量的样本气体或者参考气体能够通过溢流通道140排出，而不被气体通道120传输至气隙111，能够确保进入测量气隙111的参考气体和样本气体具有接近相等的流量。In some embodiments, as shown in FIG. 3 , each gas channel 120 is provided with an overflow channel 140 before the first restrictor assembly 121 . When the flow rate of the sample gas or the reference gas changes, the sample gas or reference gas that exceeds the flow rate limited by the first flow restricting component 121 can be discharged through the overflow channel 140 without being transmitted to the air gap 111 by the gas channel 120, which can ensure that it enters the measurement air gap The reference and sample gases of 111 have nearly equal flow rates.
示例性的，请参见图3，气体通道120包括进气通道122和第一出气通道123，进气通道122和第一出气通道123连接。进气通道122和第一出气通道123可以分别设置，或者可以一体式设置。For example, referring to FIG. 3 , the gas passage 120 includes an intake passage 122 and a first outlet passage 123 , and the inlet passage 122 and the first outlet passage 123 are connected. The air intake passage 122 and the first air outlet passage 123 may be provided separately, or may be integrally provided.
如图3所示，进气通道122和第一出气通道123的连接处连接溢流通道140。示例性的，溢流通道140可以是进气通道122和第一出气通道123连接处的通孔，例如当进气通道122和第一出气通道123一体式设置时，在第一限流组件121之前开设通孔作为溢流通道140，使得超出第一限流组件121限定流量的样本气体或者参考气体能够通过溢流通道140排出。示例性的，溢流通道140可 以是气路通道，其中一端连接在进气通道122和第一出气通道123的连接处。进气通道122的气体一部分通过第一出气通道123传输至气隙111，超出第一限流组件121限定流量的气体通过溢流通道140排出。As shown in FIG. 3 , the connection between the intake passage 122 and the first outlet passage 123 is connected to the overflow passage 140 . Exemplarily, the overflow passage 140 may be a through hole at the connection between the air intake passage 122 and the first air outlet passage 123 . A through hole is previously opened as the overflow channel 140 , so that the sample gas or the reference gas exceeding the limited flow rate of the first flow restricting component 121 can be discharged through the overflow channel 140 . Exemplarily, the overflow passage 140 may be an air passage passage, one end of which is connected to the connection between the air inlet passage 122 and the first air outlet passage 123. A part of the gas in the inlet passage 122 is transmitted to the air gap 111 through the first outlet passage 123 , and the gas exceeding the flow rate limited by the first restrictor assembly 121 is discharged through the overflow passage 140 .
在一些实施方式中，如图4至图7所示，至少两个气体通道120的溢流通道140与一第二出气通道150连通。超出第一限流组件121限定流量的样本气体和/或参考气体通过溢流通道140传输至第二出气通道150汇合后，从第二出气通道150排出。从而可以将超出限定流量的气体从一个第二出气通道150排出，简化装置结构。In some embodiments, as shown in FIGS. 4 to 7 , the overflow channels 140 of the at least two gas channels 120 communicate with a second gas outlet channel 150 . The sample gas and/or the reference gas exceeding the flow rate limited by the first restrictor assembly 121 are transmitted through the overflow channel 140 to the second gas outlet channel 150 to be merged, and then discharged from the second gas outlet channel 150 . Therefore, the gas exceeding the limited flow rate can be discharged from a second gas outlet channel 150, thereby simplifying the structure of the device.
可以理解的，溢流通道140和第二出气通道150可以一体式设置，或者分别设置。It can be understood that the overflow channel 140 and the second air outlet channel 150 may be integrally provided, or may be provided separately.
在一些实施方式中，如图5所示，第二出气通道150上设置有第二限流组件151。超出第一限流组件121限定流量的样本气体和/或参考气体在第二出气通道150汇合后，由第二限流组件151限流，至少部分样本气体和/或参考气体从第二出气通道150排出。In some embodiments, as shown in FIG. 5 , a second restrictor assembly 151 is disposed on the second air outlet channel 150 . After the sample gas and/or the reference gas exceeding the flow rate limited by the first restrictor assembly 121 are merged in the second air outlet channel 150, the flow of the sample gas and/or the reference gas is restricted by the second flow restrictor assembly 151, and at least part of the sample gas and/or reference gas flows from the second air outlet channel 150 discharge.
示例性的，第二限流组件151包括限流孔板、调节阀中的至少一种，用于限定第二出气通道150的流量和/或压力。其中，限流孔板包括单孔板或多孔板，和/或包括单级或多级的孔板。通过在第二出气通道150上设置第二限流组件151，可以降低样本气体或者参考气体流量变化时，经第二出气通道150排出的气体对浓度测量的干扰，例如可以防止第二出气通道150排出气体的压力不稳定对传感器130检测磁致声压的影响。Exemplarily, the second restricting component 151 includes at least one of a restricting orifice plate and a regulating valve, for restricting the flow and/or pressure of the second air outlet channel 150 . Wherein, the restricting orifice plate includes a single-orifice plate or a multi-hole plate, and/or a single-stage or multi-stage orifice plate. By arranging the second flow restricting component 151 on the second gas outlet channel 150, the interference of the gas discharged through the second gas outlet channel 150 to the concentration measurement can be reduced when the flow rate of the sample gas or the reference gas changes, for example, the second gas outlet channel 150 can be prevented from interfering with the concentration measurement. The unstable pressure of the exhaust gas has an influence on the detection of the magneto-acoustic pressure by the sensor 130 .
在一些实施方式中，如图6所示，第二出气通道150在第二限流组件151之前设置有差压传感器152，差压传感器152用于采集第二出气通道150和气隙111之间的气压差，气压差用于与气体压力信号确定样本气体中顺磁气体的浓度。In some embodiments, as shown in FIG. 6 , the second air outlet channel 150 is provided with a differential pressure sensor 152 before the second restrictor assembly 151 , and the differential pressure sensor 152 is used to collect the pressure between the second air outlet channel 150 and the air gap 111 . The air pressure difference is used in conjunction with the gas pressure signal to determine the concentration of the paramagnetic gas in the sample gas.
示例性的，差压传感器152包括两个输入口，其中一个输入口与气隙111连通，另一个输入口与第二出气通道150连通，且连通处位于第二出气通道150的第二限流组件151之前。例如，其中一个输入口连接在一管路的一端，该管路的另一端靠近所述气隙111设置；另一个输入口连接在另一管路的一端，该管路的另一端与第二出气通道150连接，且连接处位于第二出气通道150的第二限流组件151之前。Exemplarily, the differential pressure sensor 152 includes two input ports, one of which is communicated with the air gap 111 , and the other input port is communicated with the second air outlet channel 150 , and the communication point is located at the second flow restriction of the second air outlet channel 150 . before component 151. For example, one input port is connected to one end of a pipeline, and the other end of the pipeline is arranged close to the air gap 111; the other input port is connected to one end of another pipeline, and the other end of the pipeline is connected to the second The air outlet passages 150 are connected, and the connection is located before the second restrictor element 151 of the second air outlet passage 150 .
示例性的，差压传感器152用于采集第二出气通道150与溢流通道140的连接处的气压和气隙111处气压的气压差。如图6所示，差压传感器152的一个输入口通过一管路与第二出气通道150与溢流通道140连接。Exemplarily, the differential pressure sensor 152 is used to collect the air pressure difference between the air pressure at the connection between the second air outlet channel 150 and the overflow channel 140 and the air pressure at the air gap 111 . As shown in FIG. 6 , an input port of the differential pressure sensor 152 is connected to the second air outlet channel 150 and the overflow channel 140 through a pipeline.
第二出气通道150和气隙111之间的气压差可以表征样本气体和参考气体流量的变化，可以根据气压差补偿流量变化对测量结果的影响。The air pressure difference between the second air outlet channel 150 and the air gap 111 can represent the change of the flow rate of the sample gas and the reference gas, and the influence of the flow change on the measurement result can be compensated according to the air pressure difference.
传感器130连接测量装置100的处理器20或者连接医疗通气***中的处理器201，处理器20和/或处理器201根据传感器130的气体压力信号，以及第二出气通道150和气隙111之间的气压差确定样本气体中顺磁气体的浓度，测量结果更准确。The sensor 130 is connected to the processor 20 of the measuring device 100 or to the processor 201 in the medical ventilation system. The air pressure difference determines the concentration of paramagnetic gas in the sample gas, and the measurement results are more accurate.
示例性的，处理器20和/或处理器201可以根据预设的气压差和补偿量的映射关系，确定差压传感器152测得的气压差对应的补偿量，以及根据该补偿量对根据传感器130的气体压力信号确定的浓度进行修正。Exemplarily, the processor 20 and/or the processor 201 may determine the compensation amount corresponding to the air pressure difference measured by the differential pressure sensor 152 according to the preset mapping relationship between the air pressure difference and the compensation amount, and according to the compensation amount The concentration determined by the gas pressure signal of 130 is corrected.
在一些实施方式中，如图7所示，第二出气通道150上设置有恒压组件153，恒压组件153用于维持第二出气通道150和气隙111之间的气压差小于或等于压力差值阈值。In some embodiments, as shown in FIG. 7 , a constant pressure component 153 is provided on the second air outlet channel 150 , and the constant pressure component 153 is used to maintain the air pressure difference between the second air outlet channel 150 and the air gap 111 to be less than or equal to the pressure difference value threshold.
示例性的，恒压组件153包括恒压阀和/或恒压泵。Illustratively, the constant pressure assembly 153 includes a constant pressure valve and/or a constant pressure pump.
当气体通道120进入的样本气体和/或参考气体的流量变化时，恒压组件153可以通过控制通过第二出气通道150的流量的大小确保恒压组件153两侧的压力差变化很小，以使得第二出气通道150和气隙111之间的气压差，如第二出气通道150与溢流通道140的连接处的气压和气隙111处气压的气压差变化很小，在可接受的范围之内，从而可以使得经气体通道120传输至气隙111的流量大小变化很小，处于可接受范围之内，从而降低或消除样本气体和参考气体流量的变化对氧浓度测量的影响。When the flow rate of the sample gas and/or the reference gas entering the gas channel 120 changes, the constant pressure component 153 can ensure that the pressure difference between the two sides of the constant pressure component 153 changes very little by controlling the flow rate through the second gas outlet channel 150, so as to ensure that the pressure difference between the two sides of the constant pressure component 153 changes little. The air pressure difference between the second air outlet channel 150 and the air gap 111, such as the air pressure difference between the air pressure at the connection between the second air outlet channel 150 and the overflow channel 140 and the air pressure at the air gap 111, changes very little, within an acceptable range , so that the change in the flow rate transmitted through the gas channel 120 to the air gap 111 is small and within an acceptable range, thereby reducing or eliminating the influence of the change in the flow rate of the sample gas and the reference gas on the oxygen concentration measurement.
在一些实施方式中，如图4至图7所示，测量装置100包括壳体10，壳体10上设有至少两个进气口11和至少一个出气口12，至少两个进气口11与至少两个气体通道120一一对应连通，气隙111和溢流通道140均与出气口12连通。样本气体和参考气体经两个进气口11进入测量装置100，传输至气隙111的气体和经溢流通道140排出的气体能够通过出气口12排出。In some embodiments, as shown in FIGS. 4 to 7 , the measuring device 100 includes a housing 10 , and the housing 10 is provided with at least two air inlets 11 and at least one air outlet 12 , and at least two air inlets 11 are provided on the housing 10 . In a one-to-one correspondence with the at least two gas passages 120 , both the air gap 111 and the overflow passage 140 are in communication with the gas outlet 12 . The sample gas and the reference gas enter the measuring device 100 through the two gas inlets 11 , and the gas transmitted to the air gap 111 and the gas discharged through the overflow channel 140 can be discharged through the gas outlet 12 .
示例性的，该壳体10具有一腔室13。磁性装置110、传感器130和第一限流组件121设置在腔室13中，气体通道120延伸到壳体10的外部。例如，气 体通道120延伸到壳体10的外部形成进气口11，样本气体和参考气体经两个进气口11，由气体通道120传输至磁性装置110的气隙111中，产生磁致声压，以便传感器130采集对应的气体通道120上的气体压力信号，气隙111位于腔室13中，因此经过气隙111的气体收容在腔室13中；超出第一限流组件121限定流量的样本气体和/或参考气体经溢流通道140排出至腔室13中，腔室13中的气体经壳体10上的出气口12排出测量装置100。Illustratively, the housing 10 has a chamber 13 . The magnetic device 110 , the sensor 130 and the first restrictor assembly 121 are disposed in the chamber 13 , and the gas channel 120 extends to the outside of the housing 10 . For example, the gas channel 120 extends to the outside of the housing 10 to form the gas inlet 11 , and the sample gas and the reference gas are transmitted from the gas channel 120 to the air gap 111 of the magnetic device 110 through the two gas inlets 11 to generate magneto-acoustics. pressure, so that the sensor 130 collects the gas pressure signal on the corresponding gas channel 120, the air gap 111 is located in the chamber 13, so the gas passing through the air gap 111 is contained in the chamber 13; The sample gas and/or the reference gas is discharged into the chamber 13 through the overflow channel 140 , and the gas in the chamber 13 is discharged from the measuring device 100 through the gas outlet 12 on the housing 10 .
在一些实施方式中，气隙111和溢流通道140连通。示例性的，气隙111和溢流通道140通过腔室13连通。腔室13和壳体10上的出气口12连通，经过气隙111的气体收容在腔室13中，经溢流通道140排出的气体也收容在腔室13中，腔室13中的气体经壳体10上的出气口12排出测量装置100。In some embodiments, the air gap 111 communicates with the overflow channel 140 . Exemplarily, the air gap 111 and the overflow channel 140 communicate through the chamber 13 . The chamber 13 communicates with the air outlet 12 on the housing 10, the gas passing through the air gap 111 is contained in the chamber 13, the gas discharged through the overflow channel 140 is also contained in the chamber 13, and the gas in the chamber 13 passes through the chamber 13. The air outlet 12 on the housing 10 exits the measuring device 100 .
示例性的，气隙111和第二出气通道150均与腔室13连通，例如气隙111和溢流通道140连接的第二出气通道150连通。Exemplarily, both the air gap 111 and the second air outlet channel 150 communicate with the chamber 13 , for example, the air gap 111 and the second air outlet channel 150 connected with the overflow channel 140 communicate with each other.
示例性的，气隙111和第二出气通道150通过腔室13连通。例如，经过气隙111的气体收容在腔室13中，经溢流通道140排出的气体在第二出气通道150汇合后排出至腔室13中，腔室13中的气体经壳体10上的出气口12排出测量装置100。Exemplarily, the air gap 111 and the second air outlet channel 150 are communicated through the chamber 13 . For example, the gas passing through the air gap 111 is contained in the chamber 13 , the gas discharged through the overflow channel 140 is discharged into the chamber 13 after the second gas outlet channel 150 is merged, and the gas in the chamber 13 passes through the gas on the casing 10 . The air outlet 12 exits the measuring device 100 .
本申请实施例的顺磁气体的测量装置，包括至少两个气体通道，分别用于将参考气体和样本气体导向能够提供磁场的气隙，气体通道上设有用于采集气体压力信号的传感器，气体压力信号用于确定样本气体中顺磁气体的浓度；通过在气体通道上设置限流组件，使不同气体通道的气体流量的差值小于或等于流量差值阈值；能够降低或避免样本气体或者参考气体流量变化的对浓度测量的干扰，降低或消除流量变化对顺磁气体浓度测量的影响。The paramagnetic gas measurement device according to the embodiment of the present application includes at least two gas channels, which are respectively used to guide the reference gas and the sample gas to an air gap capable of providing a magnetic field. The gas channel is provided with a sensor for collecting gas pressure signals. The pressure signal is used to determine the concentration of the paramagnetic gas in the sample gas; by setting the restrictor component on the gas channel, the difference of the gas flow of different gas channels is less than or equal to the flow difference threshold; it can reduce or avoid the sample gas or reference Gas flow changes interfere with concentration measurement, reduce or eliminate the influence of flow changes on paramagnetic gas concentration measurement.
请结合上述实施例参阅图8，图8是本申请另一实施例提供的顺磁气体的测量装置100的结构示意图。Please refer to FIG. 8 in conjunction with the above embodiment. FIG. 8 is a schematic structural diagram of a paramagnetic gas measurement device 100 provided by another embodiment of the present application.
如图8所示，测量装置100包括：As shown in FIG. 8, the measurement device 100 includes:
磁性装置110，所述磁性装置110具有能够提供磁场的气隙111；a magnetic device 110 having an air gap 111 capable of providing a magnetic field;
至少两个气体通道120，其中一个所述气体通道120用于将参考气体导向所述气隙111，另一个所述气体通道120用于将样本气体导向所述气隙111；at least two gas channels 120, wherein one of the gas channels 120 is used for guiding the reference gas to the air gap 111, and the other gas channel 120 is used for guiding the sample gas to the air gap 111;
设置在所述气体通道120上的传感器130，所述传感器130用于采集对应的气体通道120上的气体压力信号；a sensor 130 disposed on the gas channel 120, the sensor 130 is used to collect the gas pressure signal on the corresponding gas channel 120;
处理器20，所述处理器20连接所述传感器130，用于根据所述气体压力信号确定样本气体中顺磁气体的浓度；a processor 20, the processor 20 is connected to the sensor 130 for determining the concentration of the paramagnetic gas in the sample gas according to the gas pressure signal;
其中，各所述气体通道120在所述传感器130的前侧设置有第一限流组件121，以使不同气体通道120的气体流量的差值小于或等于流量差值阈值。Wherein, each of the gas channels 120 is provided with a first flow restricting component 121 on the front side of the sensor 130 , so that the difference between the gas flows of different gas channels 120 is less than or equal to the flow difference threshold.
具体地，处理器20可以是微控制单元(Micro-controller Unit，MCU)、中央处理单元(Central Processing Unit，CPU)或数字信号处理器(Digital Signal Processor，DSP)等。Specifically, the processor 20 may be a micro-controller unit (Micro-controller Unit, MCU), a central processing unit (Central Processing Unit, CPU), or a digital signal processor (Digital Signal Processor, DSP), or the like.
本申请实施例提供的测量装置的具体原理和实现方式均与前述实施例的测量装置类似，此处不再赘述。The specific principles and implementation manners of the measuring apparatus provided in the embodiments of the present application are similar to those of the measuring apparatuses in the foregoing embodiments, and details are not described herein again.
请结合上述实施例参阅图2，图2是本申请另一实施例提供的医疗通气***的结构示意图。Please refer to FIG. 2 in conjunction with the above-mentioned embodiment. FIG. 2 is a schematic structural diagram of a medical ventilation system provided by another embodiment of the present application.
如图2所示，该医疗通气***包括至少一个气源接口210、分别与至少一个气源接口210连接的至少一个气体供应支路220、以及呼吸回路230。As shown in FIG. 2 , the medical ventilation system includes at least one gas source interface 210 , at least one gas supply branch 220 respectively connected to the at least one gas source interface 210 , and a breathing circuit 230 .
具体的，至少一个气体供应支路220能够向呼吸回路230输出气体。可以通过控制至少一个气体供应支路220向呼吸回路230输出气体，以调整呼吸回路230的气体的氧浓度。Specifically, at least one gas supply branch 220 can output gas to the breathing circuit 230 . The oxygen concentration of the gas in the breathing circuit 230 can be adjusted by controlling at least one gas supply branch 220 to output gas to the breathing circuit 230 .
其中，呼吸回路230连接前述实施例的测量装置100。Wherein, the breathing circuit 230 is connected to the measuring device 100 of the foregoing embodiment.
示例性的，呼吸回路230通过一采样管连接测量装置100，向测量装置100输出样本气体。例如，呼吸回路230连接测量装置100的用于传输样本气体的气体通道。Exemplarily, the breathing circuit 230 is connected to the measurement device 100 through a sampling tube, and outputs sample gas to the measurement device 100 . For example, the breathing circuit 230 is connected to a gas channel of the measurement device 100 for transporting the sample gas.
在一些实施方式中，呼吸回路230包括吸气支路231、呼气支路232和通气主气路233。吸气支路231、呼气支路232和通气主气路233中的至少一个连接测量装置100，由测量装置100检测呼吸回路230中相应位置气体的氧浓度。In some embodiments, breathing circuit 230 includes an inspiratory branch 231 , an expiratory branch 232 and a main ventilation circuit 233 . At least one of the inspiratory branch 231 , the expiratory branch 232 and the main ventilation air circuit 233 is connected to the measuring device 100 , and the measuring device 100 detects the oxygen concentration of the gas at the corresponding position in the breathing circuit 230 .
示例性的，如图2所示，通气主气路233通过一下采样管连接测量装置100，通气主气路233中的部分气体作为样本气体输入测量装置100，由测量装置100测量氧浓度。Exemplarily, as shown in FIG. 2 , the main ventilation gas path 233 is connected to the measurement device 100 through a lower sampling tube, and part of the gas in the ventilation main gas path 233 is input to the measurement device 100 as sample gas, and the measurement device 100 measures the oxygen concentration.
示例性的，医疗通气***还包括气体控制装置240，气体控制装置240和呼吸回路230分别与至少一个气体供应支路220连接；气体控制装置240控制至少一个气体供应支路220输出到呼吸回路230的气体。Exemplarily, the medical ventilation system further includes a gas control device 240, and the gas control device 240 and the breathing circuit 230 are respectively connected to at least one gas supply branch 220; the gas control device 240 controls the at least one gas supply branch 220 to output to the breathing circuit 230. gas.
示例性的，空气可以通过其中一个气源接口210经其气体供应支路220输 出到呼吸回路230；纯氧可以通过另一个气源接口210经其气体供应支路220输出到呼吸回路230。Exemplarily, air can be output to the breathing circuit 230 through one of the air source interfaces 210 through its gas supply branch 220; pure oxygen can be output to the breathing circuit 230 through the other air source interface 210 through its gas supply branch 220.
示例性的，气体控制装置240能够控制至少一个气体供应支路220的开度，以调节输出到呼吸回路230的气体的氧浓度。Exemplarily, the gas control device 240 can control the opening of the at least one gas supply branch 220 to adjust the oxygen concentration of the gas output to the breathing circuit 230 .
在一些实施方式中，医疗通气***还包括处理器201，处理器201例如可以设置在气体控制装置240中，或者也可以设置在气体控制装置240之外的控制板上。In some embodiments, the medical ventilation system further includes a processor 201 , and the processor 201 may be disposed in the gas control device 240 , for example, or may also be disposed on a control board outside the gas control device 240 .
具体地，处理器201可以是微控制单元(Micro-controller Unit，MCU)、中央处理单元(Central Processing Unit，CPU)或数字信号处理器(Digital Signal Processor，DSP)等。Specifically, the processor 201 may be a micro-controller unit (Micro-controller Unit, MCU), a central processing unit (Central Processing Unit, CPU), or a digital signal processor (Digital Signal Processor, DSP) or the like.
示例性的，测量装置100与气体控制装置240和/或处理器201电连接，能够将呼吸回路230的氧浓度数据传输给气体控制装置240和/或处理器201，以便气体控制装置240和/或处理器201调节输出到呼吸回路230的气体的氧浓度。Exemplarily, the measurement device 100 is electrically connected to the gas control device 240 and/or the processor 201 and is capable of transmitting oxygen concentration data of the breathing circuit 230 to the gas control device 240 and/or the processor 201 so that the gas control device 240 and/or the processor 201 Or processor 201 adjusts the oxygen concentration of the gas output to breathing circuit 230 .
本申请实施例提供的医疗通气***的具体原理和实现方式均与前述实施例的测量装置类似，此处不再赘述。The specific principles and implementation manners of the medical ventilation system provided by the embodiments of the present application are similar to those of the measurement apparatuses in the foregoing embodiments, which will not be repeated here.
本申请实施例提供的医疗通气***，通过在测量装置的气体通道上设置限流组件，使不同气体通道的气体流量的差值小于或等于流量差值阈值；能够降低或避免样本气体或者参考气体流量变化的对浓度测量的干扰，降低或消除流量变化对顺磁气体浓度测量的影响，从而可以提高医疗通气***的安全性、可靠性。In the medical ventilation system provided by the embodiments of the present application, by arranging a flow restricting component on the gas channel of the measuring device, the difference between the gas flows of different gas channels is less than or equal to the flow difference threshold; the sample gas or reference gas can be reduced or avoided. The interference of the flow change on the concentration measurement can reduce or eliminate the influence of the flow change on the measurement of the paramagnetic gas concentration, thereby improving the safety and reliability of the medical ventilation system.
应当理解，在此本申请中所使用的术语仅仅是出于描述特定实施例的目的而并不意在限制本申请。It should be understood that the terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application.
还应当理解，在本申请和所附权利要求书中使用的术语“和/或”是指相关联列出的项中的一个或多个的任何组合以及所有可能组合，并且包括这些组合。It will also be understood that, as used in this application and the appended claims, the term "and/or" refers to and including any and all possible combinations of one or more of the associated listed items.
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到各种等效的修改或替换，这些修改或替换都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以权利要求的保护范围为准。The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed in the present application. Modifications or substitutions shall be covered by the protection scope of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (15)

  1. 一种顺磁气体的测量装置，其特征在于，包括：A measuring device for paramagnetic gas, comprising:
    磁性装置，所述磁性装置具有能够提供磁场的气隙；a magnetic device having an air gap capable of providing a magnetic field;
    至少两个气体通道，其中一个所述气体通道用于将参考气体导向所述气隙，另一个所述气体通道用于将样本气体导向所述气隙；at least two gas channels, wherein one of the gas channels is used to guide the reference gas to the air gap, and the other of the gas channels is used to guide the sample gas to the air gap;
    设置在所述气体通道上的传感器，所述传感器用于采集对应的气体通道上的气体压力信号，所述气体压力信号用于确定样本气体中顺磁气体的浓度；a sensor arranged on the gas channel, the sensor is used to collect the gas pressure signal on the corresponding gas channel, and the gas pressure signal is used to determine the concentration of the paramagnetic gas in the sample gas;
    其中，各所述气体通道在所述传感器之前设置有第一限流组件，以使不同气体通道的气体流量的差值小于或等于流量差值阈值。Wherein, each of the gas channels is provided with a first flow restricting component before the sensor, so that the difference between the gas flow rates of the different gas channels is less than or equal to the flow rate difference threshold.
  2. 根据权利要求1所述的测量装置，其特征在于，各所述气体通道在所述第一限流组件之前设置有溢流通道。The measuring device according to claim 1, wherein each of the gas channels is provided with an overflow channel before the first restrictor assembly.
  3. 根据权利要求2所述的测量装置，其特征在于，所述气体通道包括进气通道和第一出气通道，所述进气通道和所述第一出气通道连接，且所述进气通道和所述第一出气通道的连接处连接所述溢流通道。The measuring device according to claim 2, wherein the gas passage comprises an inlet passage and a first outlet passage, the inlet passage and the first outlet passage are connected, and the inlet passage is connected to the first outlet passage. The overflow channel is connected to the connection of the first air outlet channel.
  4. 根据权利要求2所述的测量装置，其特征在于，所述气隙和所述溢流通道连通。The measuring device according to claim 2, wherein the air gap communicates with the overflow channel.
  5. 根据权利要求2-4中任一项所述的测量装置，其特征在于，所述测量装置包括壳体，所述壳体上设有至少两个进气口和至少一个出气口，所述至少两个进气口与所述至少两个气体通道一一对应连通，所述气隙和所述溢流通道均与所述出气口连通。The measuring device according to any one of claims 2-4, characterized in that, the measuring device comprises a casing, and at least two air inlets and at least one air outlet are provided on the casing, and the at least one air outlet is provided on the casing. The two air inlets are in one-to-one correspondence with the at least two gas passages, and both the air gap and the overflow passage are in communication with the air outlet.
  6. 根据权利要求5所述的测量装置，其特征在于，所述壳体具有一腔室，所述磁性装置、所述传感器和所述第一限流组件设置在所述腔室中，所述气体通道延伸到所述壳体的外部。6. The measuring device according to claim 5, wherein the housing has a chamber in which the magnetic device, the sensor and the first restrictor assembly are arranged, and the gas A channel extends to the outside of the housing.
  7. 根据权利要求2-4中任一项所述的测量装置，其特征在于，至少两个所述气体通道的溢流通道与一第二出气通道连通，所述气隙和所述第二出气通道连通。The measuring device according to any one of claims 2-4, wherein the overflow channels of at least two of the gas channels communicate with a second gas outlet channel, and the air gap and the second gas outlet channel Connected.
  8. 根据权利要求7所述的测量装置，其特征在于，所述测量装置的壳体具有一腔室，所述腔室和所述壳体上的出气口连通，所述气隙和所述第二出气通 道均与所述腔室连通。The measuring device according to claim 7, wherein the housing of the measuring device has a chamber, the chamber is communicated with an air outlet on the housing, and the air gap is connected to the second air gap. The air outlet channels are all communicated with the chamber.
  9. 根据权利要求7所述的测量装置，其特征在于，所述第二出气通道上设置有第二限流组件。The measuring device according to claim 7, wherein a second flow restricting component is provided on the second air outlet channel.
  10. 根据权利要求9所述的测量装置，其特征在于，所述第二出气通道在所述第二限流组件之前设置有差压传感器，所述差压传感器用于采集所述第二出气通道和所述气隙之间的气压差，所述气压差用于与所述气体压力信号确定样本气体中顺磁气体的浓度。The measuring device according to claim 9, characterized in that, a differential pressure sensor is provided in the second air outlet channel before the second restrictor assembly, and the differential pressure sensor is used for collecting the second air outlet channel and the The gas pressure difference between the air gaps, the gas pressure difference is used to determine the concentration of the paramagnetic gas in the sample gas with the gas pressure signal.
  11. 根据权利要求10所述的测量装置，其特征在于，所述差压传感器用于采集所述第二出气通道与所述溢流通道的连接处的气压和所述气隙处气压的气压差。The measuring device according to claim 10, wherein the differential pressure sensor is used to collect the air pressure difference between the air pressure at the connection between the second air outlet channel and the overflow channel and the air pressure at the air gap.
  12. 根据权利要求7所述的测量装置，其特征在于，所述第二出气通道上设置有恒压组件，所述恒压组件用于维持所述第二出气通道和所述气隙之间的气压差小于或等于压力差值阈值。The measuring device according to claim 7, wherein a constant pressure component is provided on the second air outlet channel, and the constant pressure component is used to maintain the air pressure between the second air outlet channel and the air gap The difference is less than or equal to the pressure difference threshold.
  13. 根据权利要求1-4中任一项所述的测量装置，其特征在于，所述传感器包括声压传感器和/或麦克风。The measuring device according to any one of claims 1-4, wherein the sensor comprises a sound pressure sensor and/or a microphone.
  14. 一种顺磁气体的测量装置，其特征在于，包括：A measuring device for paramagnetic gas, comprising:
    磁性装置，所述磁性装置具有能够提供磁场的气隙；a magnetic device having an air gap capable of providing a magnetic field;
    至少两个气体通道，其中一个所述气体通道用于将参考气体导向所述气隙，另一个所述气体通道用于将样本气体导向所述气隙；at least two gas channels, wherein one of the gas channels is used to guide the reference gas to the air gap, and the other of the gas channels is used to guide the sample gas to the air gap;
    设置在所述气体通道上的传感器，所述传感器用于采集对应的气体通道上的气体压力信号；a sensor arranged on the gas channel, the sensor is used to collect the gas pressure signal on the corresponding gas channel;
    处理器，所述处理器连接所述传感器，用于根据所述气体压力信号确定样本气体中顺磁气体的浓度；a processor, connected to the sensor, for determining the concentration of the paramagnetic gas in the sample gas according to the gas pressure signal;
    其中，各所述气体通道在所述传感器的前侧设置有第一限流组件，以使不同气体通道的气体流量的差值小于或等于流量差值阈值。Wherein, each of the gas channels is provided with a first flow restricting component on the front side of the sensor, so that the difference between the gas flow rates of the different gas channels is less than or equal to the flow rate difference threshold.
  15. 一种医疗通气***,其特征在于，所述医疗通气***包括至少一个气源接口、分别与所述至少一个气源接口连接的至少一个气体供应支路，以及呼吸回路；A medical ventilation system, characterized in that the medical ventilation system comprises at least one air source interface, at least one gas supply branch connected to the at least one air source interface respectively, and a breathing circuit;
    其中，所述至少一个气体供应支路能够向所述呼吸回路输出气体，所述呼吸回路连接如权利要求1-13中任一项所述的测量装置。Wherein, the at least one gas supply branch is capable of outputting gas to the breathing circuit, which is connected to the measuring device according to any one of claims 1-13.
PCT/CN2020/141846 2020-12-30 2020-12-30 Paramagnetic gas measurement device and medical ventilation system WO2022141320A1 (en)

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