CN102908705A - Electronic flow monitor, control method and anesthesia machine - Google Patents
Electronic flow monitor, control method and anesthesia machine Download PDFInfo
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- CN102908705A CN102908705A CN2011102179421A CN201110217942A CN102908705A CN 102908705 A CN102908705 A CN 102908705A CN 2011102179421 A CN2011102179421 A CN 2011102179421A CN 201110217942 A CN201110217942 A CN 201110217942A CN 102908705 A CN102908705 A CN 102908705A
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Abstract
The present invention discloses an electronic flow monitor, a control method and an anesthesia machine. The electronic flow monitor comprises a control module, an oxygen branch used for delivering oxygen, at least one equalized gas branch used for delivering equalized gas and a master branch used for mixing oxygen with equalized gas, wherein the outputs of the oxygen branch and the equalized gas branch are respectively connected with the input of the master branch; the oxygen branch and the equalized gas branch are respectively provided with flow controllers used for regulating the gas flow; the flow controllers are in signal connection with the control module; the master branch is provided with a first flow sensor; the first flow sensor can detect the total flow when the oxygen is mixed with nitrous oxide as well as gas concentration in the mixed gas; and the first flow sensor is in signal connection with the control module. The total flow of the mixed gas and the gas concentration can be directly detected by the first flow sensor of the master branch, so that the control process is simplified.
Description
Technical field
The invention relates to a kind of electronic flow watch-dog and anesthetic machine.
Background technology
As shown in Figure 1, the function of anesthetic machine is at intra-operative patient to be carried out inhalation anesthetic and mechanical ventilation.The anesthetic machine duration of work, the gas that patient sucks is recycling in a closed loop with sodica calx tank (being used for absorbing the carbon dioxide CO2 of characteristics of contaminated respiratory droplets).(be absorbed by the body such as oxygen O2 etc.) because the consumption of gas in the loop and leak, therefore need to constantly replenish.Independently the make-up gas that continues of passage is to patient breathing circuit one in the anesthetic machine, and this road make-up gas is commonly referred to as live gas.
The formation of live gas generally was divided into for two steps:
The first step: oxygen mixes with different flows in flow monitor with balanced gas (air Air or nitrous oxide N2O);
Second step: behind mist process anaesthetic (being anesthetics) the volatilization tank of flow monitor output, form live gas, be transported to patient breathing circuit.
The mode that flow monitor is regulated the flow of oxygen and balanced gas generally has two kinds: mechanical adjustment mode and electrical adjustment mode.
The mechanical adjustment mode: the user is by the flow of mechanical needle valve regulation oxygen and balanced gas, and the flow of employing flow transducer or mechanical rotor effusion meter monitoring oxygen and balanced gas.Mechanical adjustment mode system is simple, cost is lower, reliability is high, and its shortcoming is that automaticity is not high.In addition, for obtaining needed oxygen concentration and total flow, the user need to calculate required oxygen and the flow of balanced gas voluntarily.This kind mode generally is applied to the low and middle-end type.
The electrical adjustment mode: the user only need to input required oxygen concentration and total flow, and system monitors various gas flows automatically, reaches the index that the user sets.Electrical adjustment mode automaticity is higher, and is simple to operate, and precision is higher, but system is comparatively complicated, and cost is high, generally is used for the middle and high end type.
The flow monitor of electrical adjustment mode is commonly referred to as the electronic flow watch-dog.
As shown in Figure 2, existing electronic flow watch-dog generally has oxygen branch road 2, oxygen bypass 1, nitrous oxide branch road 3 and air branch road 4.Oxygen branch road 2 generally is provided with an on-off controller 7 (such as sluice valve), a flow control valve 8, a pressure transducer 10, a flow transducer 9 and a check valve 11.Nitrous oxide branch road and air branch road respectively are provided with an on-off controller 7, and at synchronization, these two on-off controllers only have at most a conducting.Public gas branch road 5 is provided with a flow control valve 8, a pressure transducer 10 and a check valve 11.Total branch road is provided with a pressure transducer 10.Oxygen bypass 1 is provided with a mechanical needle-valve 12 and an on-off controller 7, and (this on-off controller is often to open type, when namely not giving electricity, this on-off controller is opened, and the reason that type is often opened in selection is when system power failure, the oxygen bypass can be opened, for patient provides purity oxygen; And other on-off controller is normally closed type in this electronic flow watch-dog, when namely not giving electricity, on-off controller is closed), this machinery needle-valve is used for adjusting gas flow, this on-off controller can be avoided in normal operation lower time, because mechanical needle-valve is not fastened the situation that the oxygen bypass branch also has oxygen to pass through.
The effect of the pressure transducer of oxygen branch road, balanced gas branch road and total branch road is to detect gas circuit pressure, prevents the gas circuit hypertonia, improves security of system; In addition, information that can also be by pressure transducer compensates calculating to the gas flow value of current detection.
The effect of the check valve of oxygen branch road and balanced gas branch road is to prevent oxygen branch road and balanced gas branch road generation gas backflow phenomenon.
This electronic flow watch-dog has following shortcoming: total flow and oxygen concentration are indirect detection, and control algolithm is comparatively complicated.
Summary of the invention
The objective of the invention is for the deficiencies in the prior art, the comparatively simple electronic flow watch-dog of a kind of control algolithm, control method and anesthetic machine are provided.
For achieving the above object, the present invention has adopted following technical scheme: a kind of electronic flow watch-dog, comprise control module, oxygen branch road for delivery of oxygen, at least one balanced gas branch road for delivery of balanced gas reaches the total branch road that is used for mixture of oxygen and balanced gas, described oxygen branch road is provided with the flow controller for adjusting gas flow, described flow controller is connected with described control module signal, described control module is controlled the break-make of each described balanced gas branch road and the flow of adjustment gas, described total branch road is provided with the first flow sensor, described first flow sensor can detect the concentration of oxygen in mist total flow and the mist, and described first flow sensor is connected with described control module signal.The balanced gas branch road can have a plurality of, can have one to be the nitrous oxide branch road in these a plurality of balanced gas branch roads.
Further, described electronic flow watch-dog also comprises the oxygen bypass be used to the flow controller that bypasses described oxygen branch road.
Further, each described balanced gas branch road shares a public gas branch road, the output of each described balanced gas branch road connects the input of described public gas branch road, the input of described total branch road connects the output of described public gas branch road, each described balanced gas branch road is equipped with the first on-off controller, described public gas branch road also is provided with flow controller, and described control module is controlled respectively break-make and the adjustment gas flow of described balanced gas branch road by described the first on-off controller and flow controller.
Further, described oxygen branch road and/or public gas branch road are provided with the second quantity sensor for detection of gas flow, and described second quantity sensor is connected with described control module signal.
Further, described oxygen bypass is provided with for the mechanical needle-valve of regulating oxygen flow.The oxygen bypass can be provided with the second on-off controller for gas path on-off control.The second on-off controller can be the open type controller.The first on-off controller can be the closed type controller.
Further, described total branch road also is provided with the mechanical flowmeter for detection of gas flow.
Further, each described balanced gas branch road is equipped with flow controller, and described control module is by described flow controller adjustment gas flow.
Further, described balanced gas branch road comprises the nitrous oxide branch road, the mist total flow when described first flow sensor mixes for detecting oxygen and nitrous oxide and the flow transducer of oxygen concentration.
A kind of anesthetic machine comprises described electronic flow watch-dog.
A kind of control method of electronic flow watch-dog comprises the steps:
Receive parameter preset, described parameter preset comprises oxygen concentration, total flow and balanced gas type;
Detect in real time the mist total flow of oxygen concentration and total branch road, and regulate in real time the flow of oxygen flow and balanced gas according to detected value, until the oxygen concentration of mist and total flow reach preset value.
Further, when balanced gas is nitrous oxide, detect in real time mist total flow and the oxygen concentration of total branch road by the first flow sensor; When balanced gas is air, detect in real time the mist total flow of total branch road by the first flow sensor, the second quantity sensor by the oxygen branch road detects oxygen concentration in real time.
The invention has the beneficial effects as follows: because the concentration of oxygen can directly be measured by the first flow sensor of total branch road in the total flow of mist and the mist, so control procedure is simpler.
Description of drawings
Fig. 1 is the structured flowchart of the live gas forming process of the existing anesthetic machine of expression;
Fig. 2 is the structured flowchart of existing electronic flow watch-dog;
Fig. 3 is the structured flowchart of present embodiment electronic flow watch-dog;
Fig. 4 is the FB(flow block) of the control method of present embodiment electronic flow watch-dog.
The specific embodiment
By reference to the accompanying drawings the present invention is described in further detail below by the specific embodiment.
As shown in Figures 3 and 4, present embodiment electronic flow watch-dog comprises oxygen branch road 2, nitrous oxide branch road 4, air branch road 3, total branch road 6 and control module.Oxygen branch road 2 is used for providing pure oxygen.Nitrous oxide branch road 4 and air branch road 3 are used for optionally providing air or nitrous oxide as balanced gas under the control of control module.Total branch road 6 is used for mixture of oxygen and balanced gas, and with the gas output that is mixed to get.Control module can also be regulated by flow controller the flow of oxygen and balanced gas, makes the oxygen concentration and the total flow that reach setting by the mist of total branch road output.
Public gas branch road 5 is provided with a flow controller 14, a pressure transducer 15 and a check valve 17.Flow controller 14 is used for the adjustment gas flow.Pressure transducer 15 for detection of and prevent that gas circuit pressure is excessive.Check valve 17 is used for preventing that balanced gas from flowing backwards.
Total branch road 6 is provided with a first flow sensor 18, a pressure transducer 15 and the mechanical flowmeter 19 for detection of gas flow.First flow sensor 18 can detect mist total flow and oxygen concentration (when balanced gas is nitrous oxide).Pressure transducer 15 for detection of and prevent that total branch road pressure is excessive, and the total flow value that first flow sensor 18 records is compensated calculating.In the situation of power down, mechanical flowmeter 19 also can show flow.
Control module and each the first on-off controller 13, flow controller 14, pressure transducer 15, and flow transducer 16,18 equal signals connect.Control module can realize man-machine interaction, can be used for default oxygen concentration, total flow and balanced gas type (as selecting air or nitrous oxide); Control module can be controlled each flow controller 14 and the first on-off controller 13, can gather each pressure transducer 15, flow controller 14, the first on-off controller 13, and flow transducer 16,18, information.Further, when the system of detecting went wrong, control module can be turn-offed the power supply of all flow controllers 14 and the first on-off controller 13, and prompting is reported to the police.
The electronic flow watch-dog can also have oxygen bypass 1, and this oxygen bypass 1 can bypass oxygen branch road 2.When control module detects system and goes wrong, turn-off the power supply of all flow controllers 14 and the first on-off controller 13, the user can provide pure oxygen for patient by oxygen bypass 1.Oxygen bypass 1 is provided with a mechanical needle-valve 20 that is used for adjusting gas flow.Oxygen bypass 1 can also be provided with one and be used for the second on-off controller 21 that the control gas circuit is opened and turn-offed, and it can be avoided under normal circumstances, because mechanical needle-valve 20 is not yet fastened the situation that oxygen bypass 1 also has oxygen to pass through.The second on-off controller 21 can be for often opening type, and namely when system broke down, the second on-off controller 21 was opened, thereby oxygen bypass 1 can be opened.The first on-off controller 13 can be normally closed type, and namely when system broke down, the first on-off controller 13 was closed.When system breaks down, it can be the System Sudden power down; Also can be the parameter that arrives of system monitoring not in the parameter preset scope, such as the pressure of the monitoring pressure limit that is above standard, then control module is opened the second on-off controller; Be open type when referring to that system is normal, on-off controller turn-offs; When system broke down, on-off controller was opened.
The control method of electronic flow watch-dog is as follows:
The user is by the type (selecting air or nitrous oxide as balanced gas) of the default oxygen concentration of control module, total flow and selection balanced gas;
Judge whether system goes wrong (namely whether breaking down), as break down, then close the power supply of all flow controllers and the first on-off controller, provide pure oxygen by the oxygen bypass; As do not break down, then enter next step;
Judge that balanced gas is nitrous oxide or air.When user selection nitrous oxide during as balanced gas, judge at first whether the mist total flow of total branch road 6 and oxygen concentration reach setting value, as reach, then the finishing control flow process; As do not reach, then control module is opened the first on-off controller 13 of oxygen branch road 2, open and regulate the flow controller 14 of oxygen branch road 2, open the first on-off controller 13 of nitrous oxide branch road 4, open and regulate the flow controller 14 of public gas branch road 5, read simultaneously total flow and oxygen concentration that total branch road 6 first flow sensors 18 detect, read the value of total branch road 6 pressure transducers 15 and carry out flow-compensated calculating, form closed loop control, until reach oxygen concentration and the total flow of setting.
When user selection air during as balanced gas, judge at first whether the mist total flow of total branch road 6 and oxygen concentration reach setting value, as reach, then the finishing control flow process; As do not reach, then control module is opened the first on-off controller 13 of oxygen branch road 2, open and regulate the flow controller 14 of oxygen branch road 2, open the first on-off controller 13 of air branch road 3, open the flow controller 14 of public gas branch road 5, read simultaneously the oxygen flow that the second quantity sensor 16 of total flow that the first flow sensor 18 of total branch road 6 detects and oxygen branch road 2 detects, and gather respectively oxygen branch road 2, the second quantity sensor 16 of total branch road 6 and the value of first flow sensor 18 are carried out flow-compensated calculating, calculate current oxygen concentration by the oxygen flow and the total flow value that obtain again, form closed loop control, until reach oxygen concentration and the total flow of user preset.
For the electronic flow watch-dog, it comprises oxygen branch road 2, at least one balanced gas branch road, total branch road 6 and control module.Oxygen branch road 2 output oxygen, balanced gas branch road output balanced gas, this oxygen and balanced gas mix at total branch road, are equivalent to connect with total branch road 6 behind oxygen branch road 2 and the balanced gas branch circuit parallel connection again, the gas of total branch road 6 outputs through mixing.Oxygen branch road 2 can be provided with the second quantity sensor 16 for detection of oxygen flow.Total branch road 6 is provided with the first flow sensor 18 for detection of mist total flow and oxygen concentration.First, second flow transducer 16,18 all is connected with the control module signal.Balanced gas can only have one or more.Balanced gas can be air or nitrous oxide, also can be other be used on the anesthetic machine can with the gas that uses after the oxygen mix.When the balanced gas branch road only has one and this road gas for air, for example working as the balanced gas branch road only is nitrous oxide branch road 4, then oxygen branch road 2 can not arrange second quantity sensor 16, and only measures oxygen concentration and mist total flow by the first flow sensor 18 of total branch road 6; When the gas that provides when the balanced gas branch road was air, then oxygen branch road 2 also needed to arrange second quantity sensor 16.In addition, when the balanced gas branch road had multichannel, oxygen branch road 2 also can not arrange second quantity sensor 16, and at public gas branch road 5 second quantity sensor 16 is set.First flow sensor 18 can adopt the existing flow transducer that can measure nitrous oxide, oxygen mixed gas total flow and oxygen concentration, also can adopt other can realize the structure of congenerous.
The balanced gas branch road connects total branch road, and connected mode has two kinds: a kind of is that the balanced gas branch road directly is connected with total branch road; Another kind is that the balanced gas branch road connects total branch road by public gas branch road.When the balanced gas branch road has when a plurality of, it can be the combination of above-mentioned connected mode.
The second quantity sensor 16 of oxygen branch road 2 can be arranged on the upstream of flow controller 14, also can be arranged on the downstream of flow controller 14.
The electronic flow watch-dog can also arrange oxygen bypass 1, and this oxygen bypass 1 is used for bypassing oxygen branch road 2.The output of this oxygen bypass 1 can directly connect total branch road 6, output (being the output of connecting electronic flow monitor) such as the total branch road 6 of direct connection, or directly connect total branch road 6 and be positioned at before the mechanical flowmeter 19, can also directly connect oxygen branch road 2 and be positioned at the downstream of the flow controller 14 of this branch road, as be connected between flow controller 14 and the second quantity sensor 16.Oxygen bypass 1 can be provided with the second on-off controller 21 of often opening type.Oxygen bypass 1 can also be provided for the flow controller of adjust flux, can realize the structure that gas flow is regulated such as mechanical flowmeter, flow control valve or other.
Nitrous oxide branch road 4 and air branch road 3 can arrange the device of detected pressures differential pressure respectively behind the flow controller 14 of each branch road, its effect is to detect the situation whether each branch road has Leakage Gas.
Above content is the further description of the present invention being done in conjunction with concrete embodiment, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (11)
1. electronic flow watch-dog, comprise control module, oxygen branch road for delivery of oxygen, at least one balanced gas branch road for delivery of balanced gas reaches the total branch road that is used for mixture of oxygen and balanced gas, described oxygen branch road is provided with the flow controller for adjusting gas flow, described flow controller is connected with described control module signal, described control module is controlled the break-make of each described balanced gas branch road and the flow of adjustment gas, it is characterized in that: described total branch road is provided with the first flow sensor, described first flow sensor can detect the concentration of oxygen in the flow of total branch road gas and the mist, and described first flow sensor is connected with described control module signal.
2. electronic flow watch-dog as claimed in claim 1 is characterized in that: also comprise the oxygen bypass be used to the flow controller that bypasses described oxygen branch road.
3. electronic flow watch-dog as claimed in claim 2, it is characterized in that: each described balanced gas branch road shares a public gas branch road, the output of each described balanced gas branch road connects the input of described public gas branch road, the input of described total branch road connects the output of described public gas branch road, each described balanced gas branch road is equipped with the first on-off controller, described public gas branch road is provided with flow controller, and described control module is controlled respectively break-make and the adjustment gas flow of described balanced gas branch road by described the first on-off controller and flow controller.
4. electronic flow watch-dog as claimed in claim 3, it is characterized in that: described oxygen branch road and/or public gas branch road are provided with the second quantity sensor for detection of gas flow, and described second quantity sensor is connected with described control module signal.
5. electronic flow watch-dog as claimed in claim 4 is characterized in that: described oxygen bypass is provided with for the mechanical needle-valve of regulating oxygen flow.
6. electronic flow watch-dog as claimed in claim 2, it is characterized in that: described total branch road also is provided with the mechanical flowmeter for detection of gas flow.
7. electronic flow watch-dog as claimed in claim 2, it is characterized in that: each described balanced gas branch road is equipped with flow controller, and described control module is by described flow controller adjustment gas flow.
8. electronic flow watch-dog as claimed in claim 1, it is characterized in that: described balanced gas branch road comprises the nitrous oxide branch road, the mist total flow when described first flow sensor mixes for detecting oxygen and nitrous oxide and the flow transducer of oxygen concentration.
9. an anesthetic machine is characterized in that: have the described electronic flow watch-dog of any one among the claim 1-8.
10. the control method of the described electronic flow watch-dog of any one among the claim 1-8 is characterized in that: comprise the steps:
Receive parameter preset, described parameter preset comprises oxygen concentration, total flow and balanced gas type;
Detect in real time the mist total flow of oxygen concentration and total branch road, and regulate in real time the flow of oxygen flow and balanced gas according to detected value, until the oxygen concentration of mist and total flow reach preset value.
11. the control method of electronic flow watch-dog as claimed in claim 10 is characterized in that:
When balanced gas is nitrous oxide, detect in real time mist total flow and the oxygen concentration of total branch road by the first flow sensor;
When balanced gas is air, detect in real time the mist total flow of total branch road by the first flow sensor, the second quantity sensor by the oxygen branch road detects oxygen concentration in real time.
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| CN2011102179421A CN102908705A (en) | 2011-08-01 | 2011-08-01 | Electronic flow monitor, control method and anesthesia machine |
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| CN2011102179421A CN102908705A (en) | 2011-08-01 | 2011-08-01 | Electronic flow monitor, control method and anesthesia machine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104225747A (en) * | 2013-06-08 | 2014-12-24 | 北京谊安医疗***股份有限公司 | Anesthesia machine and mechanical control electronic display flowmeter assembly thereof |
| CN106237472A (en) * | 2016-08-24 | 2016-12-21 | 周玉梅 | A kind of can quantitative Anesthesia Department anesthetic gases purifier |
| WO2021139789A1 (en) * | 2020-01-10 | 2021-07-15 | 四方光电股份有限公司 | Anesthetic gas concentration measurement system and method |
| CN118068872A (en) * | 2023-12-27 | 2024-05-24 | 中国人民解放军海军特色医学中心 | Automatic gas distribution control system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104225747A (en) * | 2013-06-08 | 2014-12-24 | 北京谊安医疗***股份有限公司 | Anesthesia machine and mechanical control electronic display flowmeter assembly thereof |
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| WO2021139789A1 (en) * | 2020-01-10 | 2021-07-15 | 四方光电股份有限公司 | Anesthetic gas concentration measurement system and method |
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