CN105476637A - Method and device for calibrating expiratory flow sensor of anesthesia apparatus - Google Patents

Method and device for calibrating expiratory flow sensor of anesthesia apparatus Download PDF

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CN105476637A
CN105476637A CN201410483007.3A CN201410483007A CN105476637A CN 105476637 A CN105476637 A CN 105476637A CN 201410483007 A CN201410483007 A CN 201410483007A CN 105476637 A CN105476637 A CN 105476637A
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reading
expiratory
tidal volume
anesthetic machine
module
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CN105476637B (en
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张煜彦
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GE Medical Systems Global Technology Co LLC
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Abstract

The invention relates to a method and device for calibrating an expiratory flow sensor of an anesthesia apparatus. The method comprises: enabling a simulated lung disposed on the anesthesia apparatus to inhale through the anesthesia apparatus; recording tidal volume provided to the simulated lung by the anesthesia apparatus; recording a reading of the expiratory flow sensor when the simulated lung exhales; and calculating an expiratory flow value corresponding to a point value to be calibrated, according to the tidal volume, the reading and a preset point value to be calibrated.

Description

The method of the expiratory flow sensor of calibration anesthetic machine and device
Technical field
The present invention relates to flow transducer technical field, particularly relate to a kind of method and the device of calibrating the expiratory flow sensor of anesthetic machine.
Background technology
Expiratory flow sensor in anesthetic machine can be used for measuring in the process of breathing at assisting patient at anesthetic machine, the flow of the gas of breathing out from patient's lung.
Usually, the pressure reduction that expiratory flow sensor can cross moving diaphragm both sides by senses flow obtains expiratory gas flow.And the life-time service of moving diaphragm can cause its characteristic deviation.Therefore, if want to extend life-span of expiratory flow sensor, will calibrate expiratory flow sensor, to eliminate the error between the reading of the exhalation flow transducer brought due to this skew and the expiration amount of reality.
Multiple trial has been had to solve this problem at present.A kind of existing method of calibrating expiratory flow sensor is connected with suction port by expiration port and is entered in air by the air release that have passed through expiratory flow sensor.
The method of another kind of calibration expiratory flow sensor first the bellows (Bellow) on anesthetic machine and the collecting bowl (WaterTrap) be positioned between exhalation sensor and expiratory check valve (expiratorycheckvalve) is removed, and then calibrates expiratory flow sensor as a reference with inner driving gas (internaldrivegas).
But the method for existing calibration expiratory flow sensor all needs the annexation changing the parts in anesthetic machine in order to calibration operation provisionally, to be calibrated complete after return to original connection status again.
So, needing to provide a kind of method and the device of calibrating the expiratory flow sensor of anesthetic machine, without the need to changing the connected mode of anesthetic machine under normal operating condition, just can calibrate exhalation flow transducer.
Summary of the invention
An embodiment provides a kind of method of calibrating the expiratory flow sensor of anesthetic machine, comprising: made the test lung air-breathing be arranged on anesthetic machine by anesthetic machine; The tidal volume that record anesthetic machine provides to test lung; The reading of expiratory flow sensor when record test lung is exhaled; And calculate the expiratory flow value corresponding to point value to be calibrated according to tidal volume, reading and the point value to be calibrated that presets.
Another embodiment of the present invention provides a kind of device calibrating the expiratory flow sensor of anesthetic machine, comprising: air-breathing module, for being made the test lung air-breathing be arranged on anesthetic machine by anesthetic machine; Tidal volume logging modle, for recording the tidal volume that anesthetic machine provides to test lung; Expiratory flow sensor read-record module, for recording the reading of expiratory flow sensor when test lung is exhaled; And expiratory flow value computing module, for calculating the expiratory flow value corresponding to point value to be calibrated according to tidal volume, reading and the point value to be calibrated that presets.
Accompanying drawing explanation
Be described for embodiments of the invention in conjunction with the drawings, the present invention may be better understood, in the accompanying drawings:
Figure 1 shows that the schematic flow sheet of an embodiment of the method for the expiratory flow sensor of calibration anesthetic machine of the present invention;
Figure 2 shows that the schematic flow sheet of an embodiment of the expiratory flow magnitude calculation in the process of the expiratory flow sensor of calibration anesthetic machine of the present invention;
Figure 3 shows that the schematic block diagram of an embodiment of the device of the expiratory flow sensor of calibration anesthetic machine of the present invention.
Detailed description of the invention
Below will describe the specific embodiment of the present invention, and it is pointed out that in the specific descriptions process of these embodiments, in order to carry out brief and concise description, this description can not all do detailed description to all features of the embodiment of reality.Should be understandable that; in the actual implementation process of any one embodiment; as in the process of any one engineering project or design object; in order to realize the objectives of developer; in order to meet that system is correlated with or that business is relevant restriction; usually can make various concrete decision-making, and this also can change to another kind of embodiment from a kind of embodiment.In addition, it will also be appreciated that, although the effort made in this development process may be complicated and tediously long, but for those of ordinary skill in the art relevant to content disclosed by the invention, some designs that the basis of the technology contents of disclosure exposure is carried out, manufacture or production etc. changes just conventional technological means, not should be understood to content of the present disclosure insufficient.
Unless otherwise defined, the technical term used in claims and description or scientific terminology should be in the technical field of the invention the ordinary meaning that the personage with general technical ability understands." first ", " second " that use in patent application specification of the present invention and claims and similar word do not represent any order, quantity or importance, and are only used to distinguish different ingredients.The similar word such as " one " or " one " does not represent that quantity limits, but represents to there is at least one." comprise " or the similar word such as " comprising " mean to appear at " comprising " or " comprising " before element or object contain the element or object and equivalent element thereof that appear at " comprising " or " comprising " presented hereinafter, do not get rid of other elements or object." connection " or " being connected " etc. similar word be not defined in physics or the connection of machinery, be also not limited to direct or indirectly connect.
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with the specific embodiment of the invention and corresponding accompanying drawing, technical solution of the present invention is clearly and completely described.Obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Expiratory flow sensor on anesthetic machine needs calibration after use after a while, the calibration steps that the embodiment of the present invention provides and device are by connecting analog lung, then be that test lung carries out respiratory movement by anesthetic machine, just automatically can complete that expiratory flow sensor is corrected.
According to embodiments of the invention, provide a kind of method of calibrating the expiratory flow sensor of anesthetic machine.
With reference to figure 1, Figure 1 shows that the schematic flow sheet of an embodiment of the method 100 of the expiratory flow sensor of calibration anesthetic machine of the present invention.Method 100 can comprise the steps 101 to 104.
In a step 101, the test lung air-breathing be arranged on anesthetic machine is made by anesthetic machine.
In one embodiment of the invention, first test lung can be connected to the patient connectivity port of the Y-piece of anesthetic machine, then by anesthetic machine manual-automotive (BTVswitch) gets to maneuvering condition (ventposition), thus by anesthetic machine to test lung air feed, make test lung air-breathing.
In one embodiment of the invention, clamping plate lung can be used as test lung, also can use any test lung with vapour lock (pneumaticresistive) function.
In one embodiment of the invention, can, according to the number of the point value to be calibrated preset, test lung be made to carry out repeatedly air-breathing.Such as, calibration chart can comprise two column informations, and string is multiple output valves (that is: point value to be calibrated) of the expiratory flow sensor preset, and another row can be the actual flows of the breath of these band calibrations corresponding to point value.Here is an example of calibration chart, contains n point value to be calibrated in table.
If point value to be calibrated has n in one embodiment of the invention, then test lung can be made to carry out n by anesthetic machine and take turns air-breathing and expiration.
In a step 102, the tidal volume that anesthetic machine provides to test lung is recorded.
Specifically, the tidal volume that in test lung breathing process each time, anesthetic machine provides to test lung can be recorded.
In one embodiment of the invention, tidal volume can be obtained according to the reading sum of the reading of internal drive gas sensor and live gas sensor.
In a more excellent embodiment of the present invention, when anesthetic machine has inspiratory flow sensor, directly can obtain tidal volume according to the reading of inspiratory flow sensor.
In step 103, the reading of expiratory flow sensor when test lung is exhaled is recorded.
In one embodiment of the invention.When test lung is exhaled each time, according to the reading time interval preset, the reading of expiratory flow sensor can be recorded.Such as, if reading time interval is set as 4 millimeters, then in test lung each time exhalation process, record the reading of expiratory flow sensor every 4 milliseconds, like this, for an exhalation process, the reading of multiple expiratory flow sensor can be recorded.In one embodiment of the invention, for an exhalation process, the number of the reading of the expiratory flow sensor recorded can equal the number of point value to be calibrated.
At step 104, the expiratory flow value corresponding to point value to be calibrated is calculated according to tidal volume, reading and the point value to be calibrated that presets.
With reference to figure 2, in one embodiment of the invention, step 104 can comprise following sub-step 201 to 204.
In sub-step 201, according to calibration point value, reading is divided into multiple groups.
In one embodiment of the invention, for the reading of the expiratory flow sensor recorded in an exhalation process, reading value can be classified as a group at two according to the reading of the expiratory flow sensor between calibration point value.
In sub-step 202, according to the expiratory gas flow in the time period that the reading in reading time interval, group and the point value to be calibrated that presets calculate corresponding to each group.
Such as, for 0 and the P of reading value in above-mentioned calibration chart of exhalation sensor 1between group, the expiratory gas flow in the time period corresponding to this group can represent by the following algebraic expression (1) containing this variable of expiratory gas flow:
Σ t = 0 T 1 [ Q 0 + ( Q 1 - Q 0 P 1 - P 0 ) × ( p t - P 0 ) ] × ΔT - - - ( 1 )
Wherein, Q can be thought 0=P 0=0.
For the P of reading value in above-mentioned calibration chart of exhalation sensor 1and P 2between group, the expiratory gas flow in the time period corresponding to this group can represent by the following algebraic expression (2) containing this variable of expiratory gas flow:
Σ t = T 1 + 1 T 2 [ Q 1 + ( Q 2 - Q 1 P 2 - P 1 ) × ( p t - P 1 ) ] × ΔT - - - ( 2 )
In like manner, for the P of reading value in above-mentioned calibration chart of exhalation sensor n-1and P nbetween group, the expiratory gas flow in the time period corresponding to this group can represent by the following algebraic expression (3) containing this variable of expiratory gas flow:
Σ t = T n - 1 + 1 T n [ Q n - 1 + ( Q n - Q n - 1 P n - P n - 1 ) × ( p t - P n - 1 ) ] × ΔT - - - ( 3 )
Wherein, Δ T represents the reading time interval preset, P 1, P 2, P n-1, P nfor the point value to be calibrated preset in above-mentioned calibration chart, p tbe the reading value of the exhalation sensor in a group, T 1represent the reading value p of the exhalation sensor in above-mentioned first group tnumber, T 2-T 1represent the reading value p of the exhalation sensor in above-mentioned second group tnumber, T n-T n-1represent the reading value p of the exhalation sensor in above-mentioned the 3rd group tnumber.Q 1, Q 2..., Q n-1, Q nrepresenting the expiratory gas flow corresponding to point value to be calibrated, is the value that the inventive method finally needs to calculate.
In sub-step 203, total expiratory gas flow equation that the expiratory gas flow sum in the time period corresponding to each group is once exhaled.
In one embodiment of the invention, the algebraic expression of the expiratory gas flow in the time period corresponding to each group listed in sub-step 202 can be added, total expiratory gas flow equation (4) of once being exhaled is as follows:
Σ t = 0 T 1 [ Q 0 + ( Q 1 - Q 0 P 1 - P 0 ) × ( p t - P 0 ) ] × ΔT + Σ t = T 1 + 1 T 2 [ Q 1 + ( Q 2 - Q 1 P 2 - P 1 ) × ( p t - P 1 ) ] × ΔT + Σ t = T 2 + 1 T 3 [ Q 2 + ( Q 3 - Q 2 P 3 - P 2 ) × ( p t - P 2 ) ] × ΔT + . . . . . . + Σ t = T n - 2 + 1 T n - 1 [ Q n - 2 + ( Q n - 1 - Q n - 2 P n - 1 - P n - 2 ) × ( p t - P n - 2 ) ] × ΔT + Σ t = T n - 1 + 1 T n [ Q n - 1 + ( Q n - Q n - 1 P n - P n - 1 ) × ( p t - P n - 1 ) ] × ΔT = TV i - - - ( 4 )
In one embodiment of the invention, algebraically distortion can also be done to equation (4) and obtain following equivalent equation (5):
Q 1 × ΔT × [ Σ t = 0 T 1 p t P 1 + Σ t = T 1 + 1 T 2 ( P 2 - p t P 2 - P 1 ) ] + Q 2 × ΔT × [ Σ t = T 1 + 1 T 2 ( p t - P 1 P 2 - P 1 ) + Σ t = T 2 + 1 T 3 ( P 3 - p t P 3 - P 2 ) ] + . . . . . . + Q n - 1 × ΔT × [ Σ t = T n - 2 + 1 T n - 1 ( p t - P n - 2 P n - 1 - P n - 2 ) + Σ t = T n - 1 + 1 T n ( P n - p t P n - P n - 1 ) ] + Q n × ΔT × Σ t = T n - 1 + 1 T n ( p t - P n - 1 P n - P n - 1 ) = TV i - - - ( 5 )
Wherein, TV irepresent in the breathing process corresponding to exhaling for i-th time, the tidal volume that anesthetic machine provides to test lung.
Based on such as giving a definition:
a ik = &Delta;T &times; [ &Sigma; t = T k - 1 + 1 T k ( p t - P k - 1 P k - P k - 1 ) + &Sigma; t = T k + 1 T k + 1 ( P k + 1 - p t P k + 1 - P k ) ] , 1 < k < n &Delta;T &times; [ &Sigma; t = 0 T k p t P k + &Sigma; t = T k + 1 T k + 1 ( P k + 1 - p t P k + 1 - P k ) ] , k = 1 &Delta;T &times; &Sigma; t = T k - 1 + 1 T k ( p t - P k - 1 P k - P k - 1 ) , k = n
Equation (5) can be rewritten into:
a i1×Q 1+a i2×Q 2+……+a in×Q n＝TV i(6)
In sub-step 204, calculate expiratory flow value according to the equation group that total expiratory gas flow equation of repeatedly exhaling forms.
For exhalation process each time, the total expiratory gas flow equation (6) in sub-step 203 can be listed.Therefore, for n exhalation process, the individual following expiratory gas flow equation of n can be listed with equation group (7) composed as follows.
a 11×Q 1+a 12×Q 2+……+a 1n×Q n＝TV 1
a 21×Q 1+a 22×Q 2+……+a 2n×Q n＝TV 2
(7)
…
a n1×Q 1+a n2×Q 2+……+a nn×Q n＝TV n
Expiratory flow value Q just can be calculated by equation group (7) 1, Q 2..., Q n-1, Q n, also just complete the correction to expiratory flow sensor.
In one embodiment of the invention, in order to improve the precision of calibration, before above-mentioned step 101, gas leakage test can also be carried out to the breathing circuit of anesthetic machine, guaranteeing that air tight or air leakage is in tolerance interval.In addition, by expiratory flow sensor and sensor (as: inspiratory flow sensor, internal drive gas sensor, the live gas sensor) zero recording tidal volume can also be used for.
To the method for the expiratory flow sensor of the calibration anesthetic machine that described herein according to the embodiment of the present invention.According to method of the present invention, without the need to changing the connected mode of anesthetic machine under normal operating condition, just can calibrate exhalation flow transducer.
Similar with the method, present invention also offers corresponding device.
Figure 3 shows that the schematic block diagram of an embodiment of the device of the expiratory flow sensor of calibration anesthetic machine of the present invention.
As shown in Figure 3, device 300 can comprise: air-breathing module 301, for being made the test lung air-breathing of the patient connectivity port of the Y-piece being connected to anesthetic machine by described anesthetic machine; Tidal volume logging modle 302, for recording the tidal volume that anesthetic machine provides to test lung; Expiratory flow sensor read-record module 303, for recording the reading of expiratory flow sensor when test lung is exhaled; And expiratory flow value computing module 304, for calculating the expiratory flow value corresponding to point value to be calibrated according to tidal volume, reading and the point value to be calibrated that presets.
In one embodiment of the invention, air-breathing module 301 may further include: repeatedly air-breathing module, for the number according to the point value to be calibrated preset, makes test lung carry out repeatedly air-breathing.
In one embodiment of the invention, expiratory flow sensor read-record module 303 may further include: for for the exhalation process corresponding to each air-breathing, according to the reading time interval preset, the module of the reading of record expiratory flow sensor.
In one embodiment of the invention, expiratory flow value computing module 304 may further include: reading grouping module, for reading being divided into multiple groups according to calibration point value; Expiratory gas flow equation generation module in time period, for calculating the expiratory gas flow in the time period corresponding to each group according to the reading in reading time interval, group and the point value to be calibrated that presets; Total expiratory gas flow equation generation module of once exhaling, for total expiratory gas flow equation that the expiratory gas flow sum in the time period corresponding to each group is once exhaled; And the equation group for forming according to total expiratory gas flow equation of repeatedly exhaling calculates the module of expiratory flow value.
In one embodiment of the invention, tidal volume logging modle 302 may further include: for obtaining the module of tidal volume according to the reading of internal drive gas sensor and the reading sum of live gas sensor.In another embodiment of the present invention, tidal volume logging modle 302 may further include: for obtaining the module of tidal volume according to the reading of inspiratory flow sensor.
In one embodiment of the invention, device 300 can also also comprise: gas leakage test module, for carrying out gas leakage test to the breathing circuit of anesthetic machine; And zero module, for expiratory flow sensor and being used for being recorded the sensor zero of tidal volume.
To the device of the expiratory flow sensor of the calibration anesthetic machine that described herein according to the embodiment of the present invention.Similar with said method, according to device of the present invention, without the need to changing the connected mode of anesthetic machine under normal operating condition, just can calibrate exhalation flow transducer.
The foregoing is only embodiments of the invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.

Claims (14)

1. calibrate a method for the expiratory flow sensor of anesthetic machine, it is characterized in that, comprising:
The test lung air-breathing be arranged on described anesthetic machine is made by described anesthetic machine;
Record the tidal volume that described anesthetic machine provides to described test lung;
Record the reading of described expiratory flow sensor when described test lung is exhaled; And
Treat described in calculating according to described tidal volume, described reading and the point value to be calibrated that presets
The expiratory flow value of calibration corresponding to point value.
2. method according to claim 1, is characterized in that, the described step of the test lung air-breathing be arranged on described anesthetic machine that made by described anesthetic machine is comprised further:
According to the number of the point value to be calibrated preset, described test lung is made to carry out repeatedly air-breathing.
3. method according to claim 2, is characterized in that, the described step recording the reading of described expiratory flow sensor when described test lung is exhaled comprises further:
For the exhalation process corresponding to each air-breathing, according to the reading time interval preset, record the reading of described expiratory flow sensor.
4. method according to claim 3, is characterized in that, the step of the described expiratory flow value calculated corresponding to described point value to be calibrated according to described tidal volume, described reading and the point value to be calibrated that presets comprises further:
According to described calibration point value, described reading is divided into multiple groups;
The expiratory gas flow organized described in each in corresponding time period is calculated according to described reading time interval, reading in described group and the described point value to be calibrated preset;
According to total expiratory gas flow equation that the expiratory gas flow sum organized described in each in corresponding time period is once exhaled; And
Described expiratory flow value is calculated according to the equation group that total expiratory gas flow equation of repeatedly exhaling forms.
5. method according to claim 1, is characterized in that, the described step recording the tidal volume that described anesthetic machine provides to described test lung comprises further:
Described tidal volume is obtained according to the reading of internal drive gas sensor and the reading sum of live gas sensor.
6. method according to claim 1, is characterized in that, the described step recording the tidal volume that described anesthetic machine provides to described test lung comprises further:
Described tidal volume is obtained according to the reading of inspiratory flow sensor.
7. the method according to any one in claim 1-6, is characterized in that, also comprises:
Gas leakage test is carried out to the breathing circuit of described anesthetic machine; And
Described expiratory flow sensor and being used for is recorded the sensor zero of described tidal volume.
8. calibrate a device for the expiratory flow sensor of anesthetic machine, it is characterized in that, comprising:
Air-breathing module, for making the test lung air-breathing be arranged on described anesthetic machine by described anesthetic machine;
Tidal volume logging modle, for recording the tidal volume that described anesthetic machine provides to described test lung;
Expiratory flow sensor read-record module, for recording the reading of described expiratory flow sensor when described test lung is exhaled; And
Expiratory flow value computing module, for calculating the expiratory flow value corresponding to described point value to be calibrated according to described tidal volume, described reading and the point value to be calibrated that presets.
9. device according to claim 8, is characterized in that, described air-breathing module comprises further:
Repeatedly air-breathing module, for the number according to the point value to be calibrated preset, makes described test lung carry out repeatedly air-breathing.
10. device according to claim 9, is characterized in that, described expiratory flow sensor read-record module comprises further:
For for the exhalation process corresponding to each air-breathing, according to the reading time interval preset, record the module of the reading of described expiratory flow sensor.
11. devices according to claim 10, is characterized in that, described expiratory flow value computing module comprises further:
Reading grouping module, for being divided into multiple groups according to described calibration point value by described reading;
Expiratory gas flow equation generation module in time period, for calculating the expiratory gas flow organized described in each in corresponding time period according to described reading time interval, reading in described group and the described point value to be calibrated preset;
Total expiratory gas flow equation generation module of once exhaling, for total expiratory gas flow equation of once being exhaled according to the expiratory gas flow sum organized described in each in corresponding time period; And
Equation group for forming according to total expiratory gas flow equation of repeatedly exhaling calculates the module of described expiratory flow value.
12. devices according to claim 8, is characterized in that, described tidal volume logging modle comprises further:
For obtaining the module of described tidal volume according to the reading of internal drive gas sensor and the reading sum of live gas sensor.
13. devices according to claim 8, is characterized in that, described tidal volume logging modle comprises further:
For obtaining the module of described tidal volume according to the reading of inspiratory flow sensor.
14. devices described in any one according to Claim 8 in-13, is characterized in that, also comprise: gas leakage test module, test for carrying out gas leakage to the breathing circuit of described anesthetic machine; And zero module, for described expiratory flow sensor and being used for being recorded the sensor zero of described tidal volume.
CN201410483007.3A 2014-09-19 2014-09-19 Method and device for calibrating expiratory flow sensor of anesthesia machine Active CN105476637B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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