CN101614575A - The method of the voltage of correction mass flow sensor and gas velocity relation - Google Patents
The method of the voltage of correction mass flow sensor and gas velocity relation Download PDFInfo
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Abstract
The invention provides a kind of voltage of correction mass flow sensor and the method for gas velocity relation, this method may further comprise the steps: step 1 places first mass flow sensor and second mass flow sensor respectively the air entry and the exhalation vents place of Anesthesia machine; Step 2 is provided with Anesthesia machine, makes gas enter and can only discharge from air entry from exhalation vents; And step 3, provide the gas of different in flow rate to exhalation vents, and proofread and correct first mass flow sensor and second mass flow sensor voltage and gas velocity relation separately simultaneously according to the measured pairing magnitude of voltage of air-flow that flows through first mass flow sensor and second mass flow sensor respectively.Therefore, adopt method of the present invention, compare, can make and proofread and correct the consistance that keeps better, improve the precision of proofreading and correct with independent correction; Also simplify the method for proofreading and correct simultaneously, reduce unnecessary workload, improve the efficient of proofreading and correct.
Description
Technical field
The present invention relates to Anesthesia machine, more specifically, relate to a kind of voltage of correction mass flow sensor and the method for gas velocity relation.
Background technology
When the mass flow sensor to Anesthesia machine etc. carries out the gas flow monitoring, at first need sucking and the exhalation mass flow sensor is proofreaied and correct; Two kinds of methods are used in the correction of the mass flow sensor in the Anesthesia machine at present usually: the one, think that a kind of family curve of mass flow sensor has consistance in all Anesthesia machines, proofread and correct according to characteristic method, use this monitoring method relatively simple, but precision is difficult to guarantee; The 2nd, sensor to be carried out multiple spot proofread and correct, this method can guarantee precision, but the workload of proofreading and correct is big.
Summary of the invention
Problem to be solved by this invention is, a kind of voltage of correction mass flow sensor and the method for gas velocity relation are provided, it can proofread and correct the voltage and the gas velocity relation of expiratory gas flow sensor and inspiratory flow sensor simultaneously, has simplified bearing calibration and has improved correction efficient.
In order to solve the problems of the technologies described above, the present invention proposes a kind of voltage of correction mass flow sensor and the method for gas velocity relation, this method may further comprise the steps: step 1 places first mass flow sensor and second mass flow sensor respectively the air entry and the exhalation vents place of Anesthesia machine; Step 2 is provided with Anesthesia machine, makes gas enter and can only discharge from air entry from exhalation vents; And step 3, provide the gas of different in flow rate to exhalation vents, and proofread and correct first mass flow sensor and second mass flow sensor voltage and gas velocity relation separately simultaneously according to the measured pairing magnitude of voltage of air-flow that flows through first mass flow sensor and second mass flow sensor respectively.
Wherein, step 2 also comprises: under manual mode, block the manual leather bag interface in the breathing circuit in the Anesthesia machine, and the gas circuit pressure limitation valve in the breathing circuit is transferred to maximum; And remove inspiratory valve and expiratory valve in the flap valve cover in the breathing circuit.
Step 3 also comprises: the gas velocity that will arrive exhalation vents is transferred to predetermined speed, measure the pairing magnitude of voltage of gas that flows through first mass flow sensor and second mass flow sensor respectively, whether the difference of judging two magnitudes of voltage is greater than predetermined value, if greater than predetermined value, determine that then Anesthesia machine breaks down, otherwise, simultaneously first mass flow sensor and second mass flow sensor voltage and gas velocity relation are separately proofreaied and correct.
First mass flow sensor and second mass flow sensor voltage and gas velocity relation separately proofreaied and correct and comprised: regulate the mass flow controller between source of the gas and exhalation vents, make gas arrive exhalation vents with different in flow rate respectively, and write down first mass flow sensor and second mass flow sensor respectively at the pairing a plurality of magnitudes of voltage of the air-flow under the different in flow rate by the electric unit in the Anesthesia machine, with upgrade simultaneously be recorded in the electric unit flow through first mass flow sensor and second mass flow sensor separately gas velocity and the relation curve between the detected magnitude of voltage.
The method according to this invention, predetermined speed are 70L/min, and predetermined value is 500mV.
First mass flow sensor and second mass flow sensor gas velocity and the relation curve between the detected magnitude of voltage separately of flowing through is non-linear under low flow condition, is linear under high flow condition.
In addition, connect threaded line pipe at the air entry place.
The present invention has following beneficial effect:
Adopt method of the present invention, compare with independent correction, owing to can proofread and correct expiratory gas flow sensor and inspiratory flow sensor simultaneously, the precision of correction improves so that proofread and correct the consistance that keeps better in institute; Also simplify the method for proofreading and correct simultaneously, reduce unnecessary workload, improve the efficient of proofreading and correct, and overcome the problem that independent correction can't be found mass flow sensor damage or curve offset further.
Other features and advantages of the present invention will be set forth in the following description, and, partly from instructions, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the instructions of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of instructions, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the process flow diagram according to the inventive method; And
Fig. 2 is the block diagram of anesthesia machine system.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Fig. 1 is the process flow diagram according to the inventive method.
As shown in Figure 1, this method may further comprise the steps:
S102 places first mass flow sensor and second mass flow sensor respectively the air entry and the exhalation vents place of Anesthesia machine;
S104 is provided with Anesthesia machine, makes gas enter and can only discharge from air entry from exhalation vents; And
S106, provide the gas of different in flow rate to exhalation vents, and proofread and correct first mass flow sensor and second mass flow sensor voltage and gas velocity relation separately simultaneously according to the measured pairing magnitude of voltage of air-flow that flows through first mass flow sensor and second mass flow sensor respectively.
Wherein, S104 also comprises: under manual mode, block the manual leather bag interface in the breathing circuit in the Anesthesia machine, and the gas circuit pressure limitation valve in the breathing circuit is transferred to maximum; And remove inspiratory valve and expiratory valve in the flap valve cover in the breathing circuit.
S106 also comprises: the gas velocity that will arrive exhalation vents is transferred to predetermined speed, measure the pairing magnitude of voltage of gas that flows through first mass flow sensor and second mass flow sensor respectively, whether the difference of judging two magnitudes of voltage is greater than predetermined value, if greater than predetermined value, determine that then Anesthesia machine breaks down, otherwise, simultaneously first mass flow sensor and second mass flow sensor voltage and gas velocity relation are separately proofreaied and correct.
First mass flow sensor and second mass flow sensor voltage and gas velocity relation separately proofreaied and correct and comprised: regulate the mass flow controller between source of the gas and exhalation vents, make gas arrive exhalation vents with different in flow rate respectively, and write down first mass flow sensor and second mass flow sensor respectively at the pairing a plurality of magnitudes of voltage of the air-flow under the different in flow rate by the electric unit in the Anesthesia machine, with upgrade simultaneously be recorded in the electric unit flow through first mass flow sensor and second mass flow sensor separately gas velocity and the relation curve between the detected magnitude of voltage.
The method according to this invention, predetermined speed are 70L/min, and predetermined value is 500mV.
First mass flow sensor and second mass flow sensor gas velocity and the relation curve between the detected magnitude of voltage separately of flowing through is non-linear under low flow condition, is linear under high flow condition.
In addition, connect threaded line pipe at the air entry place.
Next embodiments of the invention are described.
Fig. 2 is the block diagram of anesthesia machine system.
As shown in Figure 2, realize that the equipment of present embodiment is anesthesia machine system, it comprises breathing circuit, APL valve, mass flow controller, circuit module, and connects pipeline and wiring between each module and the parts.
The principle of present embodiment is that two mass flow sensors lay respectively at air entry and exhalation vents, is used for monitoring air-breathing and exhalation flow rate.Block the total interface except that air entry and exhalation vents on the breathing circuit, extract air-breathing and expiratory valve, make air-flow advance from air entry from exhalation vents, and flow speed stability.Regulate different flow velocitys, write down the magnitude of voltage of two mass flow sensors of different in flow rate correspondence, then obtain the calibration curve of two mass flow sensors.The magnitude of voltage of two mass flow sensors at same some place on the comparison curves then can be judged the damage or the curve offset of two mass flow sensors.
Based on above-mentioned principle of work, present embodiment may further comprise the steps:
(1) makes two mass flow sensors lay respectively at air entry and exhalation vents, be used for monitoring air-breathing and exhalation flow rate;
(2) Anesthesia machine is switched to manual mode, block manual leather bag interface, gas circuit pressure limitation (APL) valve is transferred to maximum, makes all to block air tightly on the Anesthesia machine circuit system except that air entry and exhalation vents, so only gives vent to anger from air entry from the exhalation vents air inlet;
(3) remove the interior air-breathing and expiratory valve of flap valve cover, make exhalation vents unimpeded, flow speed stability to the gas circuit of air entry;
(4) will stablize source of the gas and receive on the exhalation vents, regulate flow velocity with mass flow controller by mass flow controller;
(5) connect 1 meter long threaded line pipe at the air entry place, make the steady air current of air entry; And
(6) the quality of regulation flow controller makes air-flow reach different speed respectively, magnitude of voltage by record two mass flow sensors corresponding with different in flow rate, obtain the calibration curve of two mass flow sensors, the magnitude of voltage of two mass flow sensors at more same some place comes the damage or the curve offset of two mass flow sensors are judged according to result relatively.
The quality of regulation flow controller makes gas velocity reach 0L/min, 1L/min, 2L/min, 3L/min, 4L/min, 5L/min, 6L/min, 7L/min, 8L/min, 9L/min, 10L/min, 30L/min, 50L/min, 70L/min respectively.The characteristic of selected mass flow sensor is non-linear when low flow velocity, be linear when high flow rate, so need the several points of many demarcation during low flow velocity, can only demarcate several somes during high flow rate.The magnitude of voltage of two mass flow sensors by record different in flow rate correspondence obtains the calibration curve of two mass flow sensors.The magnitude of voltage of two mass flow sensors at more same some place comes the damage or the curve offset of two mass flow sensors are judged according to result relatively.
In sum, adopt method of the present invention, compare with independent correction, owing to can proofread and correct expiratory gas flow sensor and inspiratory flow sensor simultaneously, the precision of correction improves so that proofread and correct the consistance that keeps better in institute; Also simplify the method for proofreading and correct simultaneously, reduce unnecessary workload, improve the efficient of proofreading and correct, and overcome the problem that independent correction can't be found mass flow sensor damage or curve offset further.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the method for the voltage of a correction mass flow sensor and gas velocity relation is characterized in that, said method comprising the steps of:
Step 1 places first mass flow sensor and second mass flow sensor respectively the air entry and the exhalation vents place of Anesthesia machine;
Step 2 is provided with described Anesthesia machine, makes gas enter and can only discharge from described air entry from described exhalation vents; And
Step 3, provide the gas of different in flow rate to described exhalation vents, and proofread and correct described first mass flow sensor and described second mass flow sensor voltage and gas velocity relation separately simultaneously according to the measured pairing magnitude of voltage of air-flow that flows through described first mass flow sensor and described second mass flow sensor respectively.
2. method according to claim 1 is characterized in that, described step 2 also comprises: under manual mode, block the manual leather bag interface in the breathing circuit in the described Anesthesia machine, and the gas circuit pressure limitation valve in the described breathing circuit is transferred to maximum; And
Remove inspiratory valve and expiratory valve in the flap valve cover in the described breathing circuit.
3. method according to claim 2 is characterized in that, described step 3 also comprises:
The gas velocity that arrives described exhalation vents is transferred to predetermined speed, measure the pairing magnitude of voltage of gas that flows through described first mass flow sensor and described second mass flow sensor respectively, whether the difference of judging two magnitudes of voltage is greater than predetermined value, if greater than described predetermined value, determine that then described Anesthesia machine breaks down, otherwise, simultaneously described first mass flow sensor and described second mass flow sensor voltage and gas velocity relation are separately proofreaied and correct.
4. method according to claim 3 is characterized in that, described first mass flow sensor and described second mass flow sensor voltage and gas velocity relation separately proofreaied and correct and comprised:
The mass flow controller of adjusting between source of the gas and described exhalation vents, make gas arrive described exhalation vents with described different in flow rate respectively, and write down described first mass flow sensor and the pairing a plurality of magnitudes of voltage of the air-flow of described second mass flow sensor under described different in flow rate respectively by the electric unit in the described Anesthesia machine, with upgrade simultaneously be recorded in the described electric unit flow through described first mass flow sensor and described second mass flow sensor separately gas velocity and the relation curve between the detected magnitude of voltage.
5. method according to claim 4 is characterized in that, described predetermined speed is 70L/min, and described predetermined value is 500mV.
6. method according to claim 5, it is characterized in that, described first mass flow sensor and described second mass flow sensor gas velocity and the relation curve between the detected magnitude of voltage separately of flowing through is non-linear under low flow condition, is linear under high flow condition.
7. according to each described method in the aforementioned claim, it is characterized in that the place connects threaded line pipe at described air entry.
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