CN116568352A - Paramagnetic gas measuring device and medical ventilation system - Google Patents
Paramagnetic gas measuring device and medical ventilation system Download PDFInfo
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- CN116568352A CN116568352A CN202080107320.0A CN202080107320A CN116568352A CN 116568352 A CN116568352 A CN 116568352A CN 202080107320 A CN202080107320 A CN 202080107320A CN 116568352 A CN116568352 A CN 116568352A
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- 230000005298 paramagnetic effect Effects 0.000 title claims abstract description 42
- 238000009423 ventilation Methods 0.000 title claims abstract description 34
- 238000005259 measurement Methods 0.000 claims abstract description 55
- 230000005291 magnetic effect Effects 0.000 claims abstract description 26
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 37
- 238000004891 communication Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 336
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 15
- 239000001301 oxygen Substances 0.000 description 15
- 229910052760 oxygen Inorganic materials 0.000 description 15
- 238000010586 diagram Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 206010002091 Anaesthesia Diseases 0.000 description 1
- 230000037005 anaesthesia Effects 0.000 description 1
- 230000005690 magnetoelectric effect Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
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- 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
Abstract
A paramagnetic gas measuring device comprises a magnetic device with an air gap; at least two gas channels, one of which is used for guiding the reference gas to the air gap and the other of which is used for guiding the sample gas to the air gap; the sensor is arranged on the gas channel and used for collecting a gas pressure signal on the corresponding gas channel, and the gas pressure signal is used for determining the concentration of paramagnetic gas in the sample gas; each gas channel is provided with a first flow restriction assembly in front of the sensor such that the difference in gas flow of the different gas channels is less than or equal to a flow difference threshold. The method and the device can reduce or avoid the interference of the flow change of the sample gas or the reference gas on the concentration measurement, and reduce or eliminate the influence of the flow change on the paramagnetic gas concentration measurement. A medical ventilation system is also provided.
Description
The application relates to the technical field of gas detection, in particular to a paramagnetic gas measuring device and a medical ventilation system.
The paramagnetic gas concentration in the mixed gas is measured by utilizing the paramagnetic property of paramagnetic gas molecules such as oxygen molecules, and the magnetoacoustic pressure method is a rapid, real-time and reliable measuring method, wherein the magnetoacoustic pressure method is a method in which the commercial products are more mature and successful. The measurement system of the magnetoacoustic pressure method needs to introduce the reference gas and the sample gas into the air gap simultaneously for measurement. However, current measurement systems are susceptible to disturbance by changes in the flow of sample or reference gas, making the measurement results unstable.
Disclosure of Invention
The application provides a paramagnetic gas measurement device and a medical ventilation system, which can reduce or eliminate the influence of flow change on paramagnetic gas concentration measurement.
In a first aspect, embodiments of the present application provide a paramagnetic gas measurement apparatus, including:
a magnetic device having an air gap capable of providing a magnetic field;
at least two gas channels, one of which is used for guiding a reference gas to the air gap and the other of which is used for guiding a sample gas to the air gap;
the sensor is arranged on the gas channel and is used for collecting a gas pressure signal on the corresponding gas channel, and the gas pressure signal is used for determining the concentration of paramagnetic gas in the sample gas;
wherein each gas channel is provided with a first flow restriction assembly in front of the sensor such that the difference in gas flow of the different gas channels is less than or equal to a flow difference threshold.
In a second aspect, embodiments of the present application provide a paramagnetic gas measurement apparatus, including:
a magnetic device having an air gap capable of providing a magnetic field;
at least two gas channels, one of which is used for guiding a reference gas to the air gap and the other of which is used for guiding a sample gas to the air gap;
the sensor is arranged on the gas channel and is used for collecting gas pressure signals on the corresponding gas channel;
the processor is connected with the sensor and used for determining the concentration of paramagnetic gas in the sample gas according to the gas pressure signal;
the first flow limiting assembly is arranged on the front side of the sensor in each gas channel, so that the difference of the gas flow rates of different gas channels is smaller than or equal to a flow rate difference threshold value.
In a third aspect, embodiments of the present application provide a medical ventilation system, wherein the medical ventilation system comprises at least one air supply interface, at least one air supply branch and a breathing circuit, each connected to the at least one air supply interface;
wherein the at least one gas supply branch is capable of outputting gas to the breathing circuit, which is connected to the aforementioned measuring device.
The embodiment of the application provides a paramagnetic gas measuring device and a medical ventilation system, which comprise at least two gas channels, wherein the gas channels are respectively used for guiding reference gas and sample gas to an air gap capable of providing a magnetic field, and are provided with a sensor for acquiring a gas pressure signal, and the gas pressure signal is used for determining the concentration of paramagnetic gas in the sample gas; the flow limiting assembly is arranged on the gas channels, so that the difference value of the gas flow of different gas channels is smaller than or equal to a flow difference value threshold value; the interference of the flow change of the sample gas or the reference gas on the concentration measurement can be reduced or avoided, and the influence of the flow change on the paramagnetic gas concentration measurement is reduced or eliminated.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure of embodiments of the present application.
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a paramagnetic gas measurement apparatus according to an embodiment of the present application;
FIG. 2 is a schematic illustration of a medical ventilation system provided in an embodiment of the present application;
FIGS. 3-7 are schematic structural views of a measuring device in various embodiments;
fig. 8 is a schematic structural diagram of a paramagnetic gas measurement apparatus according to another embodiment of the present application.
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a paramagnetic gas measurement apparatus 100 according to an embodiment of the present application.
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.
A schematic structural diagram of a medical ventilation system in an embodiment is shown in fig. 2. The medical ventilation system comprises at least one gas source interface 210, at least one gas supply branch 220 connected to the at least one gas source interface 210, respectively, and a breathing circuit 230.
In particular, at least one gas supply branch 220 is capable of outputting gas to a breathing circuit 230. The oxygen concentration of the gas of the breathing circuit 230 may be adjusted by controlling the at least one gas supply branch 220 to output gas to the breathing circuit 230.
Wherein the breathing circuit 230 is connected to the measuring device 100 of the embodiment of the present application.
Illustratively, the breathing circuit 230 is coupled to the measurement device 100 via a sampling tube that outputs a sample gas to the measurement device 100. For example, the breathing circuit 230 is connected to a gas channel of the measuring device 100 for transporting a sample gas.
In some embodiments, breathing circuit 230 includes an inhalation branch 231, an exhalation branch 232, and an ventilation main gas circuit 233. At least one of the inhalation branch 231, the exhalation branch 232, and the ventilation main air path 233 is connected to the measurement device 100, and the oxygen concentration of the gas at the corresponding position in the breathing circuit 230 is detected by the measurement device 100.
Illustratively, as shown in fig. 2, the main ventilation path 233 is connected to the measuring device 100 through a lower sampling tube, and a part of the gas in the main ventilation path 233 is inputted as a sample gas into the measuring device 100, and the oxygen concentration is measured by the measuring device 100.
Illustratively, the medical ventilation system further comprises a gas control device 240, the gas control device 240 and the breathing circuit 230 being connected to at least one gas supply branch 220, respectively; the gas control device 240 controls the gas output by the at least one gas supply branch 220 to the breathing circuit 230.
Illustratively, air may be output to the breathing circuit 230 via one of the air supply interfaces 210 via its air supply branch 220; pure oxygen may be output to the breathing circuit 230 via its gas supply branch 220 through another gas source interface 210.
Illustratively, the gas control device 240 is capable of controlling the opening of the at least one gas supply branch 220 to regulate the oxygen concentration of the gas output to the breathing circuit 230.
In some embodiments, the medical ventilation system further includes a processor 201, the processor 201 may be disposed in the gas control device 240, for example, or may be disposed on a control board external to the gas control device 240.
Specifically, the processor 201 may be a Micro-controller Unit (MCU), a central processing Unit (Central Processing Unit, CPU), a digital signal processor (Digital Signal Processor, DSP), or the like.
Illustratively, 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 adjusts the oxygen concentration of the gas output to the breathing circuit 230.
As shown in fig. 1, the measuring 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.
Wherein the magnetic means 110 have an air gap 111 capable of providing a magnetic field.
The magnetic means 110 comprise, for example, a permanent magnet or an electromagnet with an air gap 111 capable of providing a constant or alternating magnetic field.
As shown in fig. 1, one gas channel 120 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, the reference gas is a gas with a known concentration, and the known concentration may be 0 to 100%, for example 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, where the gas source includes at least one of a gas tank, a gas pump, and a gas valve.
When the reference gas and the sample gas are transmitted to the air gap 111, a change in sound pressure is generated by the magnetic field, which may be referred to as a magnetoacoustic pressure. When the magnetic field is kept at a certain level, the magnetoacoustic pressures caused by the gases with different concentrations are different, so that the concentration of paramagnetic gas in the gas can be determined according to the detected magnetoacoustic pressures. For example, the concentration of the paramagnetic gas in the sample gas may be determined according to the magnetoacoustic pressure corresponding to the reference gas and the magnetoacoustic pressure corresponding to the sample gas, for example, according to the difference between the magnetoacoustic pressure corresponding to the reference gas and the magnetoacoustic pressure corresponding to the sample gas, and the concentration of the paramagnetic gas in the reference gas.
Specifically, the sensor 130 disposed on the gas channel 120 is configured to collect a gas pressure signal (or referred to as a magnetoacoustic pressure) on the corresponding gas channel 120, where the gas pressure signal is used to determine the concentration of the paramagnetic gas in the sample gas.
As shown in fig. 1, the sensor 130 on the gas channel 120 of the reference gas is used for acquiring a gas pressure signal corresponding to the reference gas, the sensor 130 on the gas channel 120 of the sample gas is used for acquiring a gas pressure signal corresponding to the sample gas, and the concentration of the paramagnetic gas in the sample gas can be determined according to the gas pressure signal corresponding to the acquired reference gas and the gas pressure signal corresponding to the sample gas.
Illustratively, the sensor 130 includes a sound pressure sensor 130 and/or a microphone. The sensor 130 is capable of generating an electrical signal from the sound pressure of the air gap 111, for example, a gas pressure signal from a voltage caused by the sound pressure, a capacitance signal, a magneto-electric effect, or the like.
For example, the sensor 130 may be disposed inside the gas channel 120, in a sidewall of the gas channel 120, or on an inner sidewall or an outer sidewall of the gas channel 120. In some embodiments, the sensor 130 may be coupled to the gas channel 120 via a conductive channel that is capable of conducting the magnetoacoustic pressure of the gas channel 120 to the sensor 130. Illustratively, one end of the conductive path is provided with a diaphragm for isolating communication with the gas path 120 and for conducting the magnetoacoustic pressure to the interior of the gas path 120 so that the sensor 130 collects a gas pressure signal through the conductive path.
For example, where the magnetic device 110 comprises an electromagnet, the air gap 111 provides an alternating magnetic field and the sensor 130, such as a microphone, may output an audio signal as the gas pressure signal.
In some embodiments, as shown in fig. 8, the measurement device 100 further comprises a processor 20, the processor 20 being connected to the sensor 130 for determining the concentration of paramagnetic gas in the sample gas from the gas pressure signal.
In other embodiments, when the measurement device 100 is used in a medical ventilation system, the sensor 130 is connected to a processor 201 in the medical ventilation system, and the processor 201 in the medical ventilation system determines the concentration of paramagnetic gas in the sample gas based on the gas pressure signal from the sensor 130.
For ease of description, the side of the channel for transporting gas that is closer to the gas source interface will generally be referred to as the front side, and the side that is farther from the gas source interface, closer to the gas outlet, will be referred to as the back side.
Specifically, as shown in fig. 1, each gas channel 120 is provided with a first flow restriction assembly 121 before the sensor 130, so that the difference in gas flow rates of the different gas channels 120 is less than or equal to a flow rate difference threshold.
Illustratively, the first flow restrictor assembly 121 includes at least one of a restrictor orifice plate, a regulator valve, and a valve for defining the flow and/or pressure of the gas passage 120. Wherein the restriction orifice plate comprises a single orifice plate or a multi-orifice plate, and/or comprises a single stage or multiple stages of orifice plates.
Illustratively, the first flow restriction assembly 121 of each gas channel 120 limits the flow of gas through the gas channel 120 to the same value or a close range. Referring to fig. 1, the same first flow restriction assembly 121 is used to make the flow rates of the reference gas and the sample gas flowing through the two gas channels 120 approximately equal, so as to reduce or avoid interference of the sample gas or the flow rate variation of the reference gas on the concentration measurement, and reduce or eliminate the influence of the flow rate variation on the paramagnetic gas concentration measurement.
In some embodiments, the flow of the sample gas or reference gas into the air gap 111 may be controlled by adjusting the first flow restriction assembly 121, for example by adjusting the number and/or size of the holes in the flow restriction orifice plate, or adjusting the number of stages of the orifice plate.
In some embodiments, as shown in fig. 3, each gas channel 120 is provided with an overflow channel 140 before the first flow restriction assembly 121. When the flow rate of the sample gas or the reference gas is changed, the sample gas or the reference gas exceeding the flow rate defined by the first flow restriction member 121 can be discharged through the overflow channel 140 without being transferred to the air gap 111 by the gas channel 120, so that it can be ensured that the reference gas and the sample gas entering the measuring air gap 111 have nearly equal flow rates.
For example, referring to fig. 3, the gas channel 120 includes a gas inlet channel 122 and a first gas outlet channel 123, and the gas inlet channel 122 is connected to the first gas outlet channel 123. The inlet passage 122 and the first outlet passage 123 may be provided separately, or may be provided integrally.
As shown in fig. 3, the junction of the inlet passage 122 and the first outlet passage 123 is connected to the overflow passage 140. For example, the overflow channel 140 may be a through hole at the connection between the air inlet channel 122 and the first air outlet channel 123, for example, when the air inlet channel 122 and the first air outlet channel 123 are integrally disposed, the through hole is opened before the first flow-limiting component 121 as the overflow channel 140, so that the sample gas or the reference gas exceeding the limited flow of the first flow-limiting component 121 can be discharged through the overflow channel 140. For example, the overflow path 140 may be a gas path, one end of which is connected to the connection of the inlet path 122 and the first outlet path 123. A portion of the gas in the inlet passage 122 is delivered to the air gap 111 through the first outlet passage 123 and the gas exceeding the limited flow rate of the first flow restriction assembly 121 is discharged through the overflow passage 140.
In some embodiments, as shown in fig. 4-7, the overflow channel 140 of at least two gas channels 120 communicates with a second outlet channel 150. The sample gas and/or the reference gas exceeding the limited flow rate of the first flow restriction assembly 121 is transferred to the second gas outlet channel 150 through the overflow channel 140, and then is discharged from the second gas outlet channel 150 after being converged. So that the gas exceeding the limited flow rate can be discharged from one second gas outlet channel 150, simplifying the structure of the apparatus.
It is understood that the overflow channel 140 and the second outlet channel 150 may be integrally provided or separately provided.
In some embodiments, as shown in fig. 5, a second flow restrictor 151 is disposed on the second outlet channel 150. After the sample gas and/or reference gas exceeding the limited flow rate of the first flow restriction assembly 121 is converged in the second gas outlet channel 150, the flow is restricted by the second flow restriction assembly 151, and at least part of the sample gas and/or reference gas is discharged from the second gas outlet channel 150.
Illustratively, the second flow restrictor assembly 151 includes at least one of a restrictor orifice plate, a regulator valve, and a valve for defining the flow and/or pressure of the second outlet channel 150. Wherein the restriction orifice plate comprises a single orifice plate or a multi-orifice plate, and/or comprises a single stage or multiple stages of orifice plates. By providing the second flow restriction member 151 on the second gas outlet channel 150, the disturbance of the gas discharged through the second gas outlet channel 150 on the concentration measurement when the flow rate of the sample gas or the reference gas is changed can be reduced, for example, the influence of the unstable pressure of the gas discharged from the second gas outlet channel 150 on the detection of the magneto-acoustic pressure by the sensor 130 can be prevented.
In some embodiments, as shown in fig. 6, the second gas outlet channel 150 is provided with a differential pressure sensor 152 before the second flow limiting assembly 151, the differential pressure sensor 152 is used to collect a gas pressure difference between the second gas outlet channel 150 and the gas gap 111, and the gas pressure difference is used to determine the concentration of paramagnetic gas in the sample gas with the gas pressure signal.
Illustratively, differential pressure sensor 152 includes two input ports, one of which communicates with air gap 111 and the other of which communicates with second outlet channel 150 before second flow restriction assembly 151 of second outlet channel 150. For example, one of the inlet ports is connected to one end of a conduit, the other end of the conduit being disposed adjacent to the air gap 111; the other input port is connected to one end of another pipe, and the other end of the pipe is connected to the second air outlet channel 150, and the connection is located before the second flow limiting component 151 of the second air outlet channel 150.
Illustratively, differential pressure sensor 152 is configured to collect the differential pressure between the air pressure at the junction of second outlet channel 150 and overflow channel 140 and the air pressure at air gap 111. As shown in fig. 6, one input port of the differential pressure sensor 152 is connected to the overflow channel 140 through a pipe to the second outlet channel 150.
The air pressure difference between the second air outlet channel 150 and the air gap 111 may represent the variation of the flow rates of the sample gas and the reference gas, and the influence of the flow rate variation on the measurement result may 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, and the processor 20 and/or the processor 201 determine the concentration of paramagnetic gas in the sample gas according to the gas pressure signal of the sensor 130 and the gas pressure difference between the second gas outlet channel 150 and the gas gap 111, so that the measurement result is more accurate.
For example, processor 20 and/or processor 201 may determine a compensation amount corresponding to the differential pressure measured by differential pressure sensor 152 based on a preset mapping between differential pressure and the compensation amount, and modify the concentration determined based on the gas pressure signal of sensor 130 based on the compensation amount.
In some embodiments, as shown in fig. 7, a constant pressure component 153 is disposed on the second air outlet channel 150, and the constant pressure component 153 is configured 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 threshold.
Illustratively, the constant pressure assembly 153 includes a constant pressure valve and/or a constant pressure pump.
When the flow rate of the sample gas and/or the reference gas entering through the gas channel 120 is changed, the constant pressure component 153 can ensure that the pressure difference between the two sides of the constant pressure component 153 is small by controlling the flow rate of the second gas outlet channel 150, so that the pressure difference between the second gas outlet channel 150 and the gas gap 111, such as the pressure difference between the gas pressure at the connection of the second gas outlet channel 150 and the overflow channel 140 and the gas pressure at the gas gap 111, is small within an acceptable range, so that the flow rate transmitted to the gas gap 111 through the gas channel 120 is small within an acceptable range, thereby reducing or eliminating the influence of the change of the flow rates of the sample gas and the reference gas on the oxygen concentration measurement.
In some embodiments, as shown in fig. 4 to 7, the measuring device 100 includes a housing 10, where at least two air inlets 11 and at least one air outlet 12 are provided on the housing 10, and the at least two air inlets 11 are in one-to-one correspondence with the at least two air channels 120, and the air gap 111 and the overflow channel 140 are both in communication with the air 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 path 140 can be discharged through the gas outlet 12.
Illustratively, the housing 10 has a chamber 13. The magnetic device 110, the sensor 130 and the first flow restriction assembly 121 are disposed in the chamber 13, and the gas passage 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, the sample gas and the reference gas are transmitted to the air gap 111 of the magnetic device 110 through the two gas inlets 11 by the gas channel 120, and the magnetoacoustic pressure is generated, 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, and thus the gas passing through the air gap 111 is contained in the chamber 13; the sample gas and/or reference gas exceeding the defined flow rate of the first flow restriction assembly 121 is discharged into the chamber 13 via the overflow channel 140, and the gas in the chamber 13 is discharged out of the measuring device 100 via the gas outlet 12 on the housing 10.
In some embodiments, the air gap 111 communicates with the overflow channel 140. Illustratively, the air gap 111 and the overflow channel 140 communicate through the chamber 13. The chamber 13 is communicated with the air outlet 12 on the housing 10, the air passing through the air gap 111 is accommodated in the chamber 13, the air discharged through the overflow channel 140 is also accommodated in the chamber 13, and the air in the chamber 13 is discharged out of the measuring device 100 through the air outlet 12 on the housing 10.
Illustratively, the air gap 111 and the second outlet channel 150 are both in communication with the chamber 13, e.g., the second outlet channel 150 to which the air gap 111 and the overflow channel 140 are connected.
Illustratively, the air gap 111 and the second outlet channel 150 communicate through the chamber 13. For example, the gas passing through the air gap 111 is accommodated in the chamber 13, the gas discharged through the overflow path 140 is converged by the second gas outlet path 150 and discharged into the chamber 13, and the gas in the chamber 13 is discharged out of the measuring device 100 through the gas outlet 12 on the housing 10.
The paramagnetic gas measuring device comprises at least two gas channels, wherein the gas channels are respectively used for guiding reference gas and sample gas to an air gap capable of providing a magnetic field, and a sensor used for collecting gas pressure signals is arranged on each gas channel and used for determining the concentration of paramagnetic gas in the sample gas; the flow limiting assembly is arranged on the gas channels, so that the difference value of the gas flow of different gas channels is smaller than or equal to a flow difference value threshold value; the interference of the flow change of the sample gas or the reference gas on the concentration measurement can be reduced or avoided, and the influence of the flow change on the paramagnetic gas concentration measurement is reduced or eliminated.
Referring to fig. 8 in combination with the above embodiments, fig. 8 is a schematic structural diagram of a paramagnetic gas measurement apparatus 100 according to another embodiment of the present application.
As shown in fig. 8, the measurement apparatus 100 includes:
a magnetic device 110, said magnetic device 110 having an air gap 111 capable of providing a magnetic field;
at least two gas channels 120, one of the gas channels 120 being for guiding a reference gas to the air gap 111, the other gas channel 120 being for guiding a sample gas to the air gap 111;
a sensor 130 disposed on the gas channel 120, the sensor 130 being configured to collect a gas pressure signal on the corresponding gas channel 120;
a processor 20, said processor 20 being connected to said sensor 130 for determining the concentration of paramagnetic gas in the sample gas based on said gas pressure signal;
wherein, each gas channel 120 is provided with a first flow restriction assembly 121 at the front side of the sensor 130, so that the difference of the gas flows of different gas channels 120 is less than or equal to the flow difference threshold.
Specifically, the processor 20 may be a Micro-controller Unit (MCU), a central processing Unit (Central Processing Unit, CPU), a digital signal processor (Digital Signal Processor, DSP), or the like.
The specific principle and implementation manner of the measuring device provided in the embodiment of the present application are similar to those of the measuring device in the foregoing embodiment, and are not repeated here.
Referring to fig. 2 in combination with the above embodiments, fig. 2 is a schematic structural diagram of a medical ventilation system according to another embodiment of the present application.
As shown in fig. 2, the medical ventilation system includes at least one air supply port 210, at least one air supply branch 220 respectively connected to the at least one air supply port 210, and a breathing circuit 230.
In particular, at least one gas supply branch 220 is capable of outputting gas to a breathing circuit 230. The oxygen concentration of the gas of the breathing circuit 230 may be adjusted by controlling the at least one gas supply branch 220 to output gas to the breathing circuit 230.
Wherein the breathing circuit 230 is connected to the measuring device 100 of the previous embodiment.
Illustratively, the breathing circuit 230 is coupled to the measurement device 100 via a sampling tube that outputs a sample gas to the measurement device 100. For example, the breathing circuit 230 is connected to a gas channel of the measuring device 100 for transporting a sample gas.
In some embodiments, the breathing circuit 230 includes an inhalation branch 231, an exhalation branch 232, and a ventilation main air circuit 233. At least one of the inhalation branch 231, the exhalation branch 232, and the ventilation main air path 233 is connected to the measurement device 100, and the oxygen concentration of the gas at the corresponding position in the breathing circuit 230 is detected by the measurement device 100.
Illustratively, as shown in fig. 2, the main ventilation path 233 is connected to the measuring device 100 through a lower sampling tube, and a part of the gas in the main ventilation path 233 is inputted as a sample gas into the measuring device 100, and the oxygen concentration is measured by the measuring device 100.
Illustratively, the medical ventilation system further comprises a gas control device 240, the gas control device 240 and the breathing circuit 230 being connected to at least one gas supply branch 220, respectively; the gas control device 240 controls the gas output by the at least one gas supply branch 220 to the breathing circuit 230.
Illustratively, air may be output to the breathing circuit 230 via one of the air supply interfaces 210 via its air supply branch 220; pure oxygen may be output to the breathing circuit 230 via its gas supply branch 220 through another gas source interface 210.
Illustratively, the gas control device 240 is capable of controlling the opening of the at least one gas supply branch 220 to regulate the oxygen concentration of the gas output to the breathing circuit 230.
In some embodiments, the medical ventilation system further includes a processor 201, the processor 201 may be disposed in the gas control device 240, for example, or may be disposed on a control board external to the gas control device 240.
Specifically, the processor 201 may be a Micro-controller Unit (MCU), a central processing Unit (Central Processing Unit, CPU), a digital signal processor (Digital Signal Processor, DSP), or the like.
Illustratively, 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 adjusts the oxygen concentration of the gas output to the breathing circuit 230.
The specific principles and implementation manners of the medical ventilation system provided in the embodiments of the present application are similar to those of the measurement device in the foregoing embodiments, and are not repeated herein.
According to the medical ventilation system provided by the embodiment of the application, the flow limiting assembly is arranged on the gas channel of the measuring device, so that the difference value of the gas flow of different gas channels is smaller than or equal to the flow difference threshold value; the method can reduce or avoid the interference of the flow change of the sample gas or the reference gas on the concentration measurement, and reduce or eliminate the influence of the flow change on the concentration measurement of the paramagnetic gas, thereby improving the safety and reliability of the medical ventilation system.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It should also be understood that the term "and/or" as used in this application and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (15)
- A paramagnetic gas measurement device comprising:a magnetic device having an air gap capable of providing a magnetic field;at least two gas channels, one of which is used for guiding a reference gas to the air gap and the other of which is used for guiding a sample gas to the air gap;the sensor is arranged on the gas channel and is used for collecting a gas pressure signal on the corresponding gas channel, and the gas pressure signal is used for determining the concentration of paramagnetic gas in the sample gas;wherein each gas channel is provided with a first flow restriction assembly in front of the sensor such that the difference in gas flow of the different gas channels is less than or equal to a flow difference threshold.
- The measurement device of claim 1, wherein each of the gas passages is provided with an overflow passage before the first flow restriction assembly.
- The measurement device of claim 2, wherein the gas channel comprises a gas inlet channel and a first gas outlet channel, the gas inlet channel and the first gas outlet channel are connected, and a junction of the gas inlet channel and the first gas outlet channel is connected to the overflow channel.
- The measurement device of claim 2, wherein the air gap communicates with the overflow channel.
- The measuring device according to any one of claims 2-4, wherein the measuring device comprises a housing, at least two air inlets and at least one air outlet are arranged on the housing, the at least two air inlets are in one-to-one correspondence with the at least two air channels, and the air gap and the overflow channel are both in communication with the air outlet.
- The measurement device of claim 5, wherein the housing has a chamber in which the magnetic device, the sensor and the first flow restricting assembly are disposed, the gas passage extending to an exterior of the housing.
- The measurement device of any one of claims 2-4, wherein the overflow channels of at least two of the gas channels are in communication with a second gas outlet channel, the air gap being in communication with the second gas outlet channel.
- The measurement device of claim 7 wherein the housing of the measurement device has a chamber, the chamber communicating with an air outlet on the housing, the air gap and the second air outlet passage each communicating with the chamber.
- The measurement device of claim 7, wherein a second flow restrictor is disposed on the second outlet channel.
- The measurement device of claim 9, wherein the second gas outlet channel is provided with a differential pressure sensor before the second flow restriction assembly, the differential pressure sensor being configured to collect a differential gas pressure between the second gas outlet channel and the air gap, the differential gas pressure being configured to determine a concentration of paramagnetic gas in the sample gas with the gas pressure signal.
- The measurement device of claim 10, wherein the differential pressure sensor is configured to collect a differential pressure between the air pressure at the junction of the second outlet channel and the overflow channel and the air pressure at the air gap.
- The measurement device of claim 7, wherein a constant pressure assembly is disposed on the second outlet channel for maintaining a differential air pressure between the second outlet channel and the air gap less than or equal to a differential pressure threshold.
- The measurement device according to any one of claims 1-4, wherein the sensor comprises a sound pressure sensor and/or a microphone.
- A paramagnetic gas measurement device comprising:a magnetic device having an air gap capable of providing a magnetic field;at least two gas channels, one of which is used for guiding a reference gas to the air gap and the other of which is used for guiding a sample gas to the air gap;the sensor is arranged on the gas channel and is used for collecting gas pressure signals on the corresponding gas channel;the processor is connected with the sensor and used for determining the concentration of paramagnetic gas in the sample gas according to the gas pressure signal;the first flow limiting assembly is arranged on the front side of the sensor in each gas channel, so that the difference of the gas flow rates of different gas channels is smaller than or equal to a flow rate difference threshold value.
- A medical ventilation system, comprising at least one air supply interface, at least one air supply branch respectively connected to the at least one air supply interface, and a breathing circuit;wherein the at least one gas supply branch is capable of outputting gas to the breathing circuit, which breathing circuit is connected to the measuring device according to any of claims 1-13.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/141846 WO2022141320A1 (en) | 2020-12-30 | 2020-12-30 | Paramagnetic gas measurement device and medical ventilation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116568352A true CN116568352A (en) | 2023-08-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080107320.0A Pending CN116568352A (en) | 2020-12-30 | 2020-12-30 | Paramagnetic gas measuring device and medical ventilation system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116568352A (en) |
| WO (1) | WO2022141320A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI931009A (en) * | 1993-03-08 | 1994-09-09 | Increa Oy | Prior to saturation of gas mixtures intended measuring device |
| EP1775582A1 (en) * | 2005-10-14 | 2007-04-18 | General Electric Company | Paramagnetic gas analyzer with detector mounting |
| FR2931682B1 (en) * | 2008-05-27 | 2010-07-30 | Air Liquide | IMPROVING THE PRECISION FOR MEASURING XENON CONTENT IN A VENTILATORY ANESTHESIA APPARATUS. |
| EP2429622B1 (en) * | 2009-05-13 | 2014-02-26 | Maquet Critical Care AB | Anesthetic breathing apparatus having volume reflector unit with controllable penetration |
| EP2515105B1 (en) * | 2011-04-21 | 2019-01-02 | General Electric Company | Gas sensor for measurement of paramagnetic gas component |
| JP6318505B2 (en) * | 2013-09-04 | 2018-05-09 | 富士電機株式会社 | Magnetic oxygen analysis method and magnetic oxygen analyzer |
-
2020
- 2020-12-30 CN CN202080107320.0A patent/CN116568352A/en active Pending
- 2020-12-30 WO PCT/CN2020/141846 patent/WO2022141320A1/en active Application Filing
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| Publication number | Publication date |
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| WO2022141320A1 (en) | 2022-07-07 |
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