A method, system, and ventilator for calculating and graphically plotting carbon dioxide output and carbon dioxide ventilation equivalent slope.

Abstract

This invention provides a method, system, and ventilator for calculating and graphically plotting carbon dioxide output and carbon dioxide ventilatory equivalent slope. The method includes: acquiring expiratory volume data (VE) and carbon dioxide partial pressure data (E) for the same respiratory cycle of the ventilator. CO2 Based on VE and E CO2 Plot volumetric and carbon dioxide curves; determine the respiratory cycle based on volumetric and carbon dioxide curves; determine the respiratory cycle based on vitamin E and vitamin E. CO2 This invention involves plotting a volumetric carbon dioxide graph for one respiratory cycle; calculating real-time carbon dioxide output data based on the volumetric carbon dioxide graph; calculating the carbon dioxide output and plotting a volumetric carbon dioxide output graph; and calculating the carbon dioxide ventilation equivalent slope based on the volumetric carbon dioxide output graph. The advantages of this invention are: it can obtain real-time carbon dioxide output curves, carbon dioxide output-volume graphs, and volumetric carbon dioxide output graphs, and obtain the carbon dioxide output and carbon dioxide ventilation equivalent slope.

Description

Technical Field

[0001] This invention belongs to the field of ventilators, specifically relating to a method, system, and ventilator for calculating and graphically plotting carbon dioxide output and carbon dioxide ventilation equivalent slope. Background Technology

[0002] Carbon dioxide emissions (V) CO2 Metabolism is one of the indicators that reflects the body's metabolic level. It can not only reflect the metabolic state of the body's cells, but is also related to the function and state of the circulatory, respiratory, and blood systems.

[0003] Carbon dioxide ventilation equivalent slope (VE / V) CO2 The ventilation-to-perfusion ratio (VE / V) represents the match between lung ventilation and blood flow, reflecting lung ventilation efficiency. CO2 Calculating the slope plays a crucial role in improving the functional parameters of carbon dioxide monitoring and enriching the dimensions of carbon dioxide monitoring. Meanwhile, VE / V... CO2 Slope data also plays an important role in determining the severity and prognosis of diseases such as heart failure, hypertrophic cardiomyopathy, pulmonary hypertension / secondary pulmonary hypertension, and chronic obstructive pulmonary disease.

[0004] Currently, many ventilators do not include monitoring of carbon dioxide output and carbon dioxide ventilatory equivalent slope; they simply provide the carbon dioxide output value for each respiratory cycle, which is not conducive to detecting the carbon dioxide exhaled by the user. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing ventilators that cannot monitor carbon dioxide output and carbon dioxide ventilation equivalent slope.

[0006] To achieve the above objectives, this invention proposes a method for calculating and graphically plotting carbon dioxide output and carbon dioxide ventilation equivalent slope, used for calculating and graphically plotting the carbon dioxide ventilation equivalent slope of a ventilator. The method includes:

[0007] Step S1: Acquire expiratory volume data (VE) and carbon dioxide partial pressure data (E) for the same respiratory cycle of the ventilator. CO2 ;

[0008] Step S2: Based on VE and E CO2 Plot the volume curve and carbon dioxide curve;

[0009] Step S3: Determine the respiratory cycle based on the volume curve and carbon dioxide curve;

[0010] Step S4: Based on VE and E CO2 Plot a volumetric carbon dioxide graph for one respiratory cycle;

[0011] Step S5: Calculate the real-time data of carbon dioxide emission according to the volumetric carbon dioxide graph;

[0012] Step S6: Calculate the carbon dioxide emission;

[0013] Step S7: Plot the volume - carbon dioxide emission graph;

[0014] Step S8: Calculate the carbon dioxide ventilation equivalent slope according to the volume - carbon dioxide emission graph.

[0015] As an improvement of the above method, the specific content of step S2 is:

[0016] Taking time as the abscissa and VE as the ordinate, plot the volume curve graph.

[0017] Taking time as the abscissa and E CO2 as the ordinate, plot the carbon dioxide curve graph.

[0018] As an improvement of the above method, the specific content of step S3 is:

[0019] Select the volume data VE and carbon dioxide partial pressure data E in the exhalation section within the same respiratory cycle; CO2 ;

[0020] Select the highest point A within a certain cycle on the volume curve as the starting point of VE, and the subsequent lowest point B is the ending point of VE;

[0021] Select the lowest point D within the same cycle on the carbon dioxide curve as the starting point of E CO2 , and the subsequent highest point C is the ending point of E CO2 ; if the lowest point on the carbon dioxide curve is a line segment, take the midpoint of the line segment as the lowest point D;

[0022] The number of data sampling points between A and B is denoted as N1, and the number of data sampling points between D and C is denoted as N2; take the smaller value of N1 and N2 as a respiratory cycle, denoted as N;

[0023] If N1 > N2, intercept the first N2 points starting from A on the volume curve as the sampling points of this respiratory cycle; if N1 < N2, intercept the first N1 points starting from D on the carbon dioxide curve as the sampling points of this respiratory cycle.

[0024] As an improvement of the above method, the specific content of step S4 is: Taking VE as the abscissa and E CO2 as the ordinate, plot the volumetric carbon dioxide graph.

[0025] As an improvement of the above method, the specific content of step S5 is:

[0026] The volumetric carbon dioxide map is divided into N-1 adjacent trapezoids, each trapezoid representing the E of two adjacent sampling points. CO2 The line connecting the value and the VE value forms the sample; N is the number of sampling points in one respiratory cycle.

[0027] Starting from the beginning of the volumetric carbon dioxide diagram, the area of ​​each trapezoid is calculated sequentially to obtain S1, S2, S3, ..., S N-1 ;

[0028] By progressively adding the areas of the trapezoids, we obtain the sequence: S1, S1+S2, S1+S2+S3, ..., S1+S2+S3+...+S N-1 This refers to real-time data on carbon dioxide emissions.

[0029] As an improvement to the above method, step S6 specifically includes:

[0030] The carbon dioxide expulsion in one respiratory cycle is S1 + S2 + S3 + ... + S N-1 Multiplying by the respiratory rate at the corresponding time point yields the carbon dioxide expulsion in ml / min.

[0031] As an improvement to the above method, step S7 specifically includes:

[0032] Plot a volumetric carbon dioxide emission graph with carbon dioxide emissions on the x-axis and VE on the y-axis.

[0033] As an improvement to the above method, step S8 specifically includes:

[0034] Based on the volumetric carbon dioxide emission chart, the slope of the straight line connecting every two adjacent data points is calculated sequentially, resulting in a slope sequence: K1, K2, K3, ..., K N-1 N is the number of sampling points in one respiratory cycle;

[0035] Calculate the carbon dioxide ventilation equivalent slope VE / V CO2 slope:

[0036] VE / V CO2 slope = 0.5 * (K1 + K2 + ... + K) Z ) / (N-1)+1.5*(K Z+1 +K Z+2 +…+K N-1 ) / (N-1)

[0037] Where Z = Round((N-1) / 2), and Round means rounding to the nearest integer.

[0038] As an improvement to the above method, step S8 specifically includes:

[0039] Based on the volumetric carbon dioxide emission chart, the slope of the straight line connecting every two adjacent data points is calculated sequentially, resulting in a slope sequence: K1, K2, K3, ..., K N-1 N is the number of sampling points in one respiratory cycle;

[0040] The median of the slope series was chosen as the carbon dioxide ventilation equivalent slope VE / V. CO2 slope.

[0041] As an improvement to the above method, step S7 further includes: drawing a carbon dioxide emission curve and a carbon dioxide emission-volume graph based on the carbon dioxide emission amount;

[0042] The carbon dioxide emission curve is plotted with time on the horizontal axis and carbon dioxide emission on the vertical axis.

[0043] The carbon dioxide emission-volume graph is plotted with VE as the horizontal axis and carbon dioxide emission as the vertical axis.

[0044] This application also provides a system for calculating and graphically plotting carbon dioxide emissions and carbon dioxide ventilation equivalent slope, implemented based on the above method. The system includes:

[0045] The data acquisition module is used to acquire expiratory volume (VE) and carbon dioxide partial pressure (E) data for the same respiratory cycle of the ventilator. CO2 ;

[0046] The volume curve and carbon dioxide curve plotting module is used for plotting based on VE and E. CO2 Plot the volume curve and carbon dioxide curve;

[0047] The respiratory cycle determination module is used to determine the respiratory cycle based on volume curves and carbon dioxide curves.

[0048] The volumetric carbon dioxide plotting module is used for plotting based on VE and E. CO2 Plot a volumetric carbon dioxide graph for one respiratory cycle;

[0049] The real-time carbon dioxide emission data calculation module is used to calculate real-time carbon dioxide emission data based on the volumetric carbon dioxide diagram.

[0050] The carbon dioxide emission calculation module is used to calculate carbon dioxide emissions.

[0051] The volumetric carbon dioxide emission graph drawing module is used to draw volumetric carbon dioxide emission graphs.

[0052] The carbon dioxide ventilation equivalent slope calculation module is used to calculate the carbon dioxide ventilation equivalent slope based on the volume-carbon dioxide discharge diagram.

[0053] This application also provides a ventilator that includes the above-mentioned carbon dioxide ventilation equivalent slope calculation and graphical drawing system.

[0054] Compared with the prior art, the advantages of the present invention are:

[0055] It can obtain real-time carbon dioxide emission curves, carbon dioxide emission-volume graphs, and volume-carbon dioxide emission graphs, and obtain carbon dioxide emission and carbon dioxide ventilation equivalent slopes, thus improving the functional parameters of carbon dioxide monitoring and enriching the dimensions of carbon dioxide monitoring. Attached Figure Description

[0056] Figure 1 The diagram shows the flowchart for calculating and graphically drawing carbon dioxide emissions and carbon dioxide ventilation equivalent slope.

[0057] Figure 2 The figures shown are the volume curve and the carbon dioxide curve.

[0058] Figure 3 The diagram shown is a volumetric carbon dioxide graph;

[0059] Figure 4 The figure shown is a graph of carbon dioxide emissions.

[0060] Figure 5 The diagram shown is a carbon dioxide emission-volume graph.

[0061] Figure 6 The diagram shown is a volumetric carbon dioxide emission graph. Detailed Implementation

[0062] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0063] This application calculates carbon dioxide emissions in real time based on volumetric carbon dioxide graphs and can also draw corresponding graphs. Based on carbon dioxide emissions, the carbon dioxide ventilation equivalent slope can also be calculated.

[0064] The method and system for calculating and graphically plotting carbon dioxide output and carbon dioxide ventilation equivalent slope provided in this application can be used on ventilators or anesthesia machines equipped with carbon dioxide modules; it can also be equipped with a flow sensor and designed as a standalone carbon dioxide monitoring instrument.

[0065] Example 1

[0066] like Figure 1 As shown, the method for calculating and graphically plotting carbon dioxide emissions and carbon dioxide ventilation equivalent slope according to the present invention includes the following steps:

[0067] Step 1: Obtain the respiratory flow rate data and carbon dioxide partial pressure data of the ventilator in the same respiratory cycle.

[0068] Obtain the respiratory flow rate data Q of the user in the same respiratory cycle from the flow sensor of the ventilator; obtain the carbon dioxide partial pressure data E of the user in the same respiratory cycle from the carbon dioxide sensor of the ventilator CO2 .

[0069] Step 2: Perform an integration operation on the respiratory flow rate data Q to obtain the volume data VE, as Figure 2 shown, respectively based on VE and E CO2 data to plot a volume curve and a carbon dioxide curve graph.

[0070] Taking time as the abscissa (x-axis) and VE as the ordinate (y-axis), plot a volume curve graph.

[0071] Taking time as the abscissa (x-axis) and E CO2 as the ordinate (y-axis), plot a carbon dioxide curve graph.

[0072] Step 3: Determine the respiratory cycle based on the volume curve and the carbon dioxide curve graph.

[0073] Select the volume data VE and the carbon dioxide partial pressure data E in the exhalation segment within the same respiratory cycle CO2 . As Figure 2 shown, the highest point A within a certain cycle on the volume curve is the starting point of VE, and the subsequent lowest point B is the ending point of VE. On the contrary, the lowest point D within the same cycle on the carbon dioxide curve is the starting point of E CO2 , and the subsequent highest point C is the ending point of E CO2 . If the lowest point on the carbon dioxide curve is a line segment, take the midpoint of the line segment as the lowest point D.

[0074] The number of data sampling points between A and B is denoted as N1, and the number of data sampling points between D and C is denoted as N2. Take the smaller value of N1 and N2 as a respiratory cycle, denoted as N. If N1 > N2, intercept the first N2 points of the volume curve starting from A; if N1 < N2, intercept the first N1 points of the carbon dioxide curve starting from D to keep the data lengths of the same respiratory cycle in the volume curve and the carbon dioxide curve consistent.

[0075] Step 4: Based on VE and E CO2 plot a volume-carbon dioxide graph of one respiratory cycle, as Figure 3 shown.

[0076] Taking VE as the abscissa (x-axis) and E CO2 as the ordinate (y-axis), plot a volume-carbon dioxide graph.

[0077] Step 5: Calculate real-time data on carbon dioxide emissions based on the volumetric carbon dioxide diagram.

[0078] The volumetric carbon dioxide diagram is divided into N-1 adjacent diagrams, each of which approximates a trapezoid.

[0079] by Figure 3 Point B (T) on the medium volume carbon dioxide chart B Time), Point C (T) C Taking (time) as an example, draw perpendicular lines to the x-axis through the two points to obtain points A and D. The coordinates of the four vertices of trapezoid ABCD are A(X) and D(D). A ,Y A ), B(X) B ,Y B ), C(X) C ,Y C ), D(X D ,Y D The area S of the trapezoid is... ABCD That is, by T B Time to T C The amount of CO2 emitted during this time period, S ABCD =(Y B +Y C )*(X D -X A ) / 2.

[0080] Starting from the beginning of the volumetric carbon dioxide diagram, the area of ​​each small trapezoid is calculated sequentially to obtain S1, S2, S3, ..., S N-1 .

[0081] V is obtained by gradually accumulating the areas of the trapezoids. CO2 Sequence: S1, S1+S2, S1+S2+S3,…, S1+S2+S3+…+S N-1 This refers to real-time data on carbon dioxide emissions.

[0082] Step 6: Calculate carbon dioxide emissions and plot carbon dioxide emission curves, carbon dioxide emission-volume graphs, and volume-carbon dioxide emission graphs.

[0083] Step 6-1: S1 + S2 + S3 + ... + S N-1 This represents the amount of carbon dioxide expelled at the end of expiration, i.e., the amount of carbon dioxide expelled in one respiratory cycle. Multiplying this value by the respiratory rate at the corresponding moment will give you the carbon dioxide expulsion rate in ml / min.

[0084] Step 6-2: Plot time on the x-axis and V on the y-axis. CO2 Plotting a graph with the vertical axis as the ordinate yields a carbon dioxide emission curve, as shown below. Figure 4 As shown.

[0085] Step 6-3: Plot VE as the x-axis and V as the y-axis. CO2 Plotting a graph on the vertical axis yields a carbon dioxide emission-volume graph, as shown below. Figure 5 As shown.

[0086] Step 6-4: With V CO2 Plotting a graph with VE as the ordinate and using VE as the x-axis yields a volumetric carbon dioxide emission graph, as shown below. Figure 6 As shown.

[0087] Step 7: Calculate the carbon dioxide ventilation equivalent slope based on the volume-carbon dioxide emission diagram.

[0088] Based on the volumetric carbon dioxide emission plot, the slope of the straight line between every two adjacent data points is calculated sequentially, resulting in a slope sequence: K1, K2, K3, ..., K N-1 .by Figure 6 Taking points A and B on the medium-volume carbon dioxide emission chart as examples, their coordinates are A(X) and B(B), respectively. A ,Y A ), B(X) B ,Y B ), K AB =(Y B -Y A ) / (X B -X A ).

[0089] Calculation of carbon dioxide ventilation equivalent slope based on slope sequence:

[0090] VE / V CO2 slope = 0.5 * (K1 + K2 + ... + K) Z ) / (N-1)+1.5*(K Z+1 +K Z+2 +…+K N-1 ) / (N-1),

[0091] Where Z = Round((N-1) / 2), Round means rounding to the nearest integer, and the constant coefficient is obtained from the algorithm simulation.

[0092] As another method for calculating the slope of the carbon dioxide ventilation equivalent, the median of the slope sequence can also be used as VE / V. CO2 slope.

[0093] Example 2

[0094] This application also provides a system for calculating and graphically plotting carbon dioxide emissions and carbon dioxide ventilation equivalent slope, implemented based on the above method. The system includes:

[0095] The data acquisition module is used to acquire expiratory volume (VE) and carbon dioxide partial pressure (E) data for the same respiratory cycle of the ventilator. CO2 ;

[0096] The volume curve and carbon dioxide curve plotting module is used for plotting based on VE and E. CO2 Plot the volume curve and carbon dioxide curve;

[0097] The respiratory cycle determination module is used to determine the respiratory cycle based on volume curves and carbon dioxide curves.

[0098] The volumetric carbon dioxide plotting module is used for plotting based on VE and E. CO2 Plot a volumetric carbon dioxide graph for one respiratory cycle;

[0099] The real-time carbon dioxide emission data calculation module is used to calculate real-time carbon dioxide emission data based on the volumetric carbon dioxide diagram.

[0100] The carbon dioxide emission calculation module is used to calculate carbon dioxide emissions.

[0101] The volumetric carbon dioxide emission graph drawing module is used to draw volumetric carbon dioxide emission graphs.

[0102] The carbon dioxide ventilation equivalent slope calculation module is used to calculate the carbon dioxide ventilation equivalent slope based on the volume-carbon dioxide discharge diagram.

[0103] Example 3

[0104] This application also provides a ventilator, including the aforementioned system for calculating and graphically plotting carbon dioxide output and carbon dioxide ventilatory equivalent slope.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for calculating carbon dioxide emission, carbon dioxide ventilation equivalent slope and graph plotting, which is used for calculating the carbon dioxide emission and carbon dioxide ventilation equivalent slope of a ventilator and plotting the graph. The method includes: Step S1: Acquire expiratory volume data (VE) and carbon dioxide partial pressure data (E) for the same respiratory cycle of the ventilator. CO2 ; Step S2: Based on VE and E CO2 Plot the volume curve and carbon dioxide curve; Step S3: Determine the respiratory cycle based on the volume curve and carbon dioxide curve graph; Step S4: Based on VE and E CO2 Plot a volumetric carbon dioxide graph for one respiratory cycle; Step S5: Calculate the real-time data of carbon dioxide emission according to the volume-carbon dioxide graph; Step S6: Calculate the carbon dioxide emission; Step S7: Plot the volume-carbon dioxide emission graph; Step S8: Calculate the carbon dioxide ventilation equivalent slope according to the volume-carbon dioxide emission graph; The specific content of step S3 is as follows: Select volumetric data (VE) and partial pressure data (E) of carbon dioxide during the expiratory phase within the same respiratory cycle. CO2 ; Select the highest point A within a certain cycle on the volume curve as the starting point of VE, and the subsequent lowest point B is the ending point of VE; Select the lowest point D within the same period on the carbon dioxide curve as E. CO2 The starting point, and the highest point C thereafter is E. CO2 The endpoint; if the lowest point on the carbon dioxide curve is a line segment, then the midpoint of the line segment is taken as the lowest point D; The number of data sampling points between A and B is denoted as N1, and the number of data sampling points between D and C is denoted as N2; Take the smaller value of N1 and N2 as a respiratory cycle, denoted as N; If N1 > N2, intercept the first N2 points of the volume curve starting from A as the sampling points of this respiratory cycle; If N1 < N2, intercept the first N1 points of the carbon dioxide curve starting from D as the sampling points of this respiratory cycle; The specific content of step S5 is as follows: The volumetric carbon dioxide map is divided into N-1 adjacent trapezoids, each trapezoid representing the E of two adjacent sampling points. CO2 The line connecting the value and the VE value forms the sample; N is the number of sampling points in one respiratory cycle. Starting from the beginning of the volumetric carbon dioxide diagram, the area of ​​each trapezoid is calculated sequentially to obtain S1, S2, S3, ..., S N-1 ; By progressively adding the areas of the trapezoids, we obtain the sequence: S1, S1+S2, S1+S2+S3, ..., S1+S2+S3+...+S N-1 This refers to real-time data on carbon dioxide emissions.

2. The method for calculating and graphically plotting carbon dioxide emissions and carbon dioxide ventilation equivalent slope according to claim 1, characterized in that, The specific content of step S2 is as follows: Taking time as the abscissa and VE as the ordinate, plot the volume curve graph; Plot time on the x-axis and E CO2 Plot the carbon dioxide curve with the vertical axis as the ordinate.

3. The method for calculating and graphically plotting carbon dioxide emissions and carbon dioxide ventilation equivalent slope according to claim 1, characterized in that, Step S4 specifically involves: using VE as the horizontal axis and E as the vertical axis. CO2 Use the vertical axis to plot the volumetric carbon dioxide graph.

4. The method for calculating and graphically plotting carbon dioxide emissions and carbon dioxide ventilation equivalent slope according to claim 1, characterized in that, The specific content of step S6 is as follows: The carbon dioxide expulsion in one respiratory cycle is S1 + S2 + S3 + ... + S N-1 Multiplying by the respiratory rate at the corresponding time point yields the carbon dioxide expulsion in ml / min.

5. The method for calculating and graphically plotting carbon dioxide emissions and carbon dioxide ventilation equivalent slope according to claim 1, characterized in that, The specific content of step S7 is as follows: Taking carbon dioxide emission as the abscissa and VE as the ordinate, plot the volume-carbon dioxide emission graph.

6. The method for calculating and graphically plotting carbon dioxide emissions and carbon dioxide ventilation equivalent slope according to claim 1, characterized in that, The specific content of step S8 is as follows: Based on the volumetric carbon dioxide emission chart, the slope of the straight line connecting every two adjacent data points is calculated sequentially, resulting in a slope sequence: K1, K2, K3, ..., K N-1 N is the number of sampling points in one respiratory cycle; Calculate the carbon dioxide ventilation equivalent slope VE / V CO2 slope: VE / V CO2 slope=0.5*(K1+K2+…+K Z ) / (N-1)+1.5*(K Z+1 +K Z+2 +…+K N-1 ) / (N-1) Where Z = Round((N - 1) / 2), and Round means rounding to the nearest integer.

7. The method for calculating and graphically plotting carbon dioxide emissions and carbon dioxide ventilation equivalent slope according to claim 1, characterized in that, The specific content of step S8 is as follows: Based on the volumetric carbon dioxide emission chart, the slope of the straight line connecting every two adjacent data points is calculated sequentially, resulting in a slope sequence: K1, K2, K3, ..., K N-1 N is the number of sampling points in one respiratory cycle; The median of the slope series was chosen as the carbon dioxide ventilation equivalent slope VE / V. CO2 slope.

8. The method for calculating and graphically plotting carbon dioxide emissions and carbon dioxide ventilation equivalent slope according to claim 1, characterized in that, Step S7 further includes: Plotting the carbon dioxide emission curve graph and the carbon dioxide emission-volume graph according to the carbon dioxide emission; The carbon dioxide emission curve graph is plotted with time as the abscissa and carbon dioxide emission as the ordinate; The carbon dioxide emission-volume graph is plotted with VE as the abscissa and carbon dioxide emission as the ordinate.

9. A system for calculating and graphically plotting carbon dioxide emissions and carbon dioxide ventilation equivalent slope, implemented based on the method described in any one of claims 1-8, characterized in that, The system includes: The data acquisition module is used to acquire expiratory volume (VE) and carbon dioxide partial pressure (E) data for the same respiratory cycle of the ventilator. CO2 ; The volume curve and carbon dioxide curve plotting module is used for plotting based on VE and E. CO2 Plot the volume curve and carbon dioxide curve; A respiratory cycle determination module, which is used to determine the respiratory cycle based on the volume curve and carbon dioxide curve graph; The volumetric carbon dioxide plotting module is used for plotting based on VE and E. CO2 Plot a volumetric carbon dioxide graph for one respiratory cycle; A carbon dioxide emission real-time data calculation module, which is used to calculate the real-time data of carbon dioxide emission according to the volume-carbon dioxide graph; A carbon dioxide emission calculation module, which is used to calculate the carbon dioxide emission; A volume-carbon dioxide emission graph plotting module, which is used to plot the volume-carbon dioxide emission graph; and A carbon dioxide ventilation equivalent slope calculation module, which is used to calculate the carbon dioxide ventilation equivalent slope according to the volume-carbon dioxide emission graph.

10. A ventilator, characterized in that, Including the carbon dioxide emission, carbon dioxide ventilation equivalent slope calculation and graph plotting system described in claim 9.

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