End-tidal carbon dioxide monitoring nasal oxygen cannula and monitoring system thereofTechnical Field
The invention relates to the technical field of modern medical treatment, in particular to a carbon dioxide monitoring nasal oxygen cannula at end expiration and a monitoring system thereof.
Background
In the modern medical field, end-tidal carbon dioxide monitoring is of vital importance for assessing respiratory function and physiological status of patients. The method can provide information on multiple aspects of ventilation, perfusion, metabolism and the like of the patient, and provides key basis for clinical diagnosis, treatment decision and prognosis evaluation of the patient.
Conventional end-tidal capnography techniques have a number of limitations when used in conjunction with nasal oxygen tubing. For example, the sampling mode of some monitoring devices is relatively fixed, and it is difficult to automatically adjust the carbon dioxide sampling strategy according to the real-time physiological condition of the patient (such as the presence or absence of a pulse), so that the monitoring data may not accurately reflect the actual respiratory state of the patient. Moreover, when analyzing the monitoring data, a comprehensive and deep evaluation module is lacking, and effective evaluation of cardiopulmonary resuscitation quality, accurate judgment of patient prognosis effect and reasonable prediction of termination timing of cardiopulmonary resuscitation cannot be performed. This makes the medical staff lack sufficient objective basis in the clinical decision process, increasing medical risk, and possibly affecting the therapeutic effect and prognosis of the patient.
In view of this, we propose a carbon dioxide end-tidal monitoring nasal oxygen cannula and monitoring system thereof.
Disclosure of Invention
The invention aims to provide a carbon dioxide monitoring nasal oxygen tube at end of expiration and a monitoring system thereof, which are used for solving the technical problems that the existing carbon dioxide monitoring system at end of expiration is inconvenient to effectively evaluate the quality of cardiopulmonary resuscitation, accurately judge the prognosis effect of a patient and reasonably predict the timing of terminating cardiopulmonary resuscitation.
The invention provides a system for monitoring carbon dioxide at the end of expiration, which comprises a pulse monitoring module, a sampling mode switching module, a carbon dioxide analysis module, a cardiopulmonary resuscitation assessment module, a prognosis effect judging module, a recovery termination prediction module, a decision making module, a cardiopulmonary resuscitation assessment module, a recovery termination prediction module and an information output module, wherein the pulse monitoring module is used for acquiring pulse information of a patient, the sampling mode switching module is connected with the pulse monitoring module, the sampling mode switching module is used for controlling two groups or a single group of air pumps to operate to adjust the sampling mode of carbon dioxide through the existence of pulses, the carbon dioxide analysis module is connected with the sampling mode switching module and is used for analyzing acquired carbon dioxide, the cardiopulmonary resuscitation assessment module is connected with the carbon dioxide analysis module and is used for evaluating the cardiopulmonary resuscitation quality of the patient through the analysis result of the carbon dioxide analysis module, the prognosis effect judging module is used for judging the prognosis effect of the patient through the analysis result of the carbon dioxide analysis module, the recovery termination prediction module is connected with the carbon dioxide analysis result is used for predicting termination of cardiopulmonary resuscitation opportunity through the carbon dioxide analysis module, the decision making module is connected with the carbon dioxide analysis module, the cardiopulmonary resuscitation assessment module, the prognosis effect judging module is used for the recovery termination prediction module is used for outputting relevant information.
According to the invention, the sampling mode is automatically switched according to the pulse condition of the patient, so that two-way or one-way accurate sampling is realized. The detailed analysis of the acquired data through the carbon dioxide analysis module comprises concentration acquisition, difference calculation, retention judgment, waveform analysis and the like, and the comprehensive and accurate basis is provided for the respiratory state evaluation of the patient by combining the cardiopulmonary resuscitation evaluation module, the prognosis effect judgment module and the resuscitation termination prediction module. The physiological state of the patient can be timely and accurately reflected no matter in emergency situations such as routine respiration monitoring and cardiopulmonary resuscitation, and medical staff is helped to make more scientific treatment decisions.
Preferably, the sampling mode switching module comprises a two-way sampling unit, a one-way sampling unit and a one-way sampling unit, wherein when the pulse monitoring module detects that the pulse exists, the two-way sampling unit synchronously samples the carbon dioxide of the mouth and the nose through two channels;
The carbon dioxide analysis module comprises a concentration acquisition unit, a difference calculation unit, a retention judgment unit, a waveform analysis unit and a control unit, wherein the concentration acquisition unit is used for acquiring carbon dioxide concentration information and generating a carbon dioxide concentration curve;
the cardiac resuscitation evaluation module comprises a compression frequency analysis unit for monitoring fluctuation frequency of carbon dioxide concentration in a waveform analysis unitEstimating cardiopulmonary resuscitation compression frequencyA compression depth analysis unit for analyzing the variation range of the carbon dioxide concentrationDepth of pressThe ventilation effect analysis unit is used for evaluating whether ventilation is effective or not through the form and the concentration value of a carbon dioxide concentration curve;
The prognosis effect judging module comprises a trend analysis unit, a stability analysis unit and a prediction unit, wherein the trend analysis unit is used for judging prognosis by analyzing the carbon dioxide concentration change trend;
the resuscitation termination prediction module comprises a threshold value judging unit, a multiparameter comprehensive unit and a control unit, wherein the threshold value judging unit judges whether to consider termination of cardiopulmonary resuscitation according to whether the concentration of carbon dioxide exceeds a preset threshold valueDifference in carbon dioxide concentrationAnd waveform informationConstructing a prediction model for stopping resuscitation opportunity;
The decision specifying module comprises a prompt tone generating unit, a display information generating unit, a decision specifying module and a decision specifying module, wherein the prompt tone generating unit generates corresponding prompt tone information according to different judging results;
The information output module comprises a display screen and a loudspeaker, wherein the display screen is connected with the display information generating unit and generates display information, and the loudspeaker is connected with the prompt tone generating unit and is used for broadcasting the generated prompt tone information.
Preferably, the concentration obtaining unit obtains the carbon dioxide concentration of the two-way sampling unit and the one-way sampling unit at the sampling time respectively with 0.5 second as a sampling period, and converts the carbon dioxide concentration into a carbon dioxide concentration curve to generate a first carbon dioxide concentrationAnd a second carbon dioxide concentration;
The difference calculating unit calculates the difference according to the first carbon dioxide concentrationAnd a second carbon dioxide concentrationCalculating the differenceAnd obtaining a difference curve.
In the retention judging unit, when the first carbon dioxide concentration isAnd a second carbon dioxide concentrationAre all greater than or equal toAnd less than or equal toWhen the exhaled carbon dioxide retention is judged to be absent, wherein,AndAre carbon dioxide concentration constants;
When the first carbon dioxide concentration isAnd a second carbon dioxide concentrationAre all greater than or equal toWhen the exhaled carbon dioxide retention exists, judging;
when judging that the expired carbon dioxide retention does not exist, the waveform analysis unit acquires an end-tidal carbon dioxide waveform and an end-tidal carbon dioxide concentration;
When judging that the expired carbon dioxide retention exists, the waveform analysis unit further acquires a difference curve and generates end-tidal carbon dioxide waveform information.
Preferably, the cardiopulmonary resuscitation compression frequencyWherein, the method comprises the steps of, wherein,AndFor the experimental fitting coefficient, ifPrompting that the pressing frequency is normal, otherwise prompting that the pressing frequency is abnormal;
The variation amplitude of the carbon dioxide concentration in the compression depth analysis unitDepth of pressThe correlation model of (2) is: Wherein, the method comprises the steps of, wherein,Is of empirical coefficient, differentCoefficients corresponding to different powers of the power,Taking 2 or 3 as polynomial times, analyzing whether the current pressing depth is enough, and prompting that the pressing depth is insufficient when the concentration change amplitude is small and the time lasts for a period of time;
in the ventilation effect analysis unit, a ventilation effect evaluation indexWherein, the method comprises the steps of, wherein,For the end-tidal carbon dioxide concentration,Is the concentration value of each point on the curve,In order to obtain an average concentration of the water,For sampling the number of points whenIn this case, the ventilation effect is good.
Preferably, in the trend analysis unit, the time sequence is set as,,......,The corresponding end-tidal carbon dioxide concentration is,,......,Trend determination is performed by calculating a slopeWhen (when)And is also provided withThe prognosis is better whenAnd is also provided withThe prognosis is poor, wherein,AndRespectively time seriesAndA corresponding end-tidal carbon dioxide concentration value,Representing the number of points in the implementation sequence for calculating the average concentration variation condition;
in the above-mentioned stability analysis unit,When (when)Less than a threshold valueAnd the stability is better during the process.
Preferably, the threshold value judging unit sets the duration asWhen (when)And is also provided withAnd pulse and respiration recovery, taking into account termination whenAnd considering termination when there is no improvement through adequate resuscitation;
in the multiparameter comprehensive unit, a prediction model for stopping resuscitation timeWherein, the method comprises the steps of, wherein,,,AndAnd for training parameters, when the model output result reaches a preset termination condition, sending out an early warning for terminating resuscitation.
Preferably, the alert tone generating unit generates different alert messages according to different carbon dioxide concentration difference ranges, including:
When the difference value of the concentration of the first exhaled carbon dioxide and the difference value of the concentration of the second exhaled carbon dioxide are both more than or equal to 50mmHg, prompting that the resuscitation mode is to increase positive pressure to supply oxygen, and prompting that the numerical value is that the oxygen partial pressure is increased by 5-10;
When the first expired carbon dioxide concentration difference value and the second expired carbon dioxide concentration difference value are both more than or equal to 40mmHg and less than 50mmHg, the prompting mode is to keep the current state;
when the difference value of the concentration of the first exhaled carbon dioxide and the difference value of the concentration of the second exhaled carbon dioxide are both more than or equal to 30mmHg and less than 40mmHg, the prompting mode is to properly increase oxygen, and the prompting numerical value is to increase by 2-5;
When the difference value of the concentration of the first exhaled carbon dioxide and the difference value of the concentration of the second exhaled carbon dioxide are both more than or equal to 20mmHg and less than 30mmHg, the prompting mode is to increase positive pressure to supply oxygen, and the prompting numerical value is to increase by 1-2;
When the first and second differences are both less than 20mmHg, the prompt mode is in a maintenance state.
Preferably, the waveform analysis unit acquires the end-tidal carbon dioxide concentration and the prompt tone information when the carbon dioxide concentration difference curve has the expired carbon dioxide concentration difference waveform, and the prompt numerical range value in the prompt tone information is 0-60mmHg.
Preferably, the decision making module generates different display and prompt information according to different end-tidal carbon dioxide concentrations, including:
When the concentration of the expired carbon dioxide is more than 60mmHg or less than or equal to 0mmHg, the display information generating unit generates prompt numerical information which is immediate cardiopulmonary resuscitation, the prompt numerical value is set to 0, and the prompt numerical information is displayed through a display screen of the information output module and broadcasted through a loudspeaker;
When the concentration of the expired carbon dioxide is more than 50mmHg and less than or equal to 60mmHg, the display information generating unit generates prompt numerical information to stop pressing, and the prompt numerical information is displayed through a display screen of the information output module;
When the concentration of the expired carbon dioxide is more than 0mmHg and less than or equal to 50mmHg, the display information generating unit generates prompt numerical information which is continuously pressed and is displayed through a display screen of the information output module.
An end-tidal carbon dioxide monitoring nasal oxygen cannula comprises a nasal oxygen cannula component with a monitor detachably connected to the end part;
The nasal oxygen tube assembly comprises a double-end tube with a gas transmission nasal plug and an exhaust nasal plug which are symmetrically formed on the outer edge surface, the middle part of the double-end tube is closed, one end of the double-end tube is connected with a carbon dioxide collecting main tube communicated with the exhaust nasal plug, one end of the carbon dioxide collecting main tube, which is far away from the double-end tube, is connected with a carbon dioxide interface I, and the nasal oxygen tube assembly also comprises a carbon dioxide collecting auxiliary tube with two ends respectively connected with a buccal breathing plug and a carbon dioxide interface II;
the inside of monitor is provided with the monitor, and the inside symmetry of monitor is provided with two sets of air pumps, two sets of the both ends of air pump all are connected with the draft tube and inhale the pipe, the draft tube all is connected in the monitor, carbon dioxide interface one and carbon dioxide interface two can dismantle respectively and be connected in the suction pipe, pulse monitoring module, sampling mode switching module, carbon dioxide analysis module, cardiopulmonary resuscitation evaluation module, prognosis effect judgement module, resuscitate and terminate and predict module, decision making module and information output module equipartition and arrange in the monitor.
Compared with the prior art, the invention has the beneficial effects that:
1. According to the invention, the sampling mode is automatically switched according to the pulse condition of the patient, so that two-way or one-way accurate sampling is realized. The detailed analysis of the acquired data through the carbon dioxide analysis module comprises concentration acquisition, difference calculation, retention judgment, waveform analysis and the like, and the comprehensive and accurate basis is provided for the respiratory state evaluation of the patient by combining the cardiopulmonary resuscitation evaluation module, the prognosis effect judgment module and the resuscitation termination prediction module. The physiological state of a patient can be timely and accurately reflected no matter under the emergency conditions such as conventional respiratory monitoring or cardiopulmonary resuscitation, so that medical staff can be helped to make more scientific treatment decisions, and the problems that the traditional end-tidal carbon dioxide monitoring system is inconvenient to effectively evaluate cardiopulmonary resuscitation quality, accurately judge the prognosis effect of the patient and reasonably predict the timing of terminating cardiopulmonary resuscitation are solved.
2. Based on the deep analysis of the carbon dioxide related data, the system can provide personalized prompt information for different patient conditions. For example, during cardiopulmonary resuscitation, by the cooperative work of the compression frequency analysis unit, the compression depth analysis unit and the ventilation effect analysis unit, cardiopulmonary resuscitation quality can be accurately estimated, and according to the estimation result, targeted operation advice such as adjustment of compression frequency, depth or ventilation strategy can be provided for medical staff. Meanwhile, the prognosis effect judging module can predict the prognosis of a patient in advance according to the carbon dioxide concentration change trend and stability analysis, is beneficial to medical staff to formulate a personalized treatment scheme and improves the treatment effect.
3. The resuscitation termination estimation module comprehensively considers various key parameters, and can more accurately estimate the time for terminating cardiopulmonary resuscitation through the cooperation of the threshold value judgment unit and the multiparameter synthesis unit. This avoids the adverse effects of terminating resuscitation prematurely or too late on the patient, improving the success rate of resuscitation. Meanwhile, the information output module timely conveys various monitoring results and prompt information to medical staff through the display screen and the loudspeaker, so that the medical staff can acquire key information at the first time, corresponding measures are adopted more rapidly and effectively, and the overall efficiency of medical treatment and treatment is greatly improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a cross-sectional view of a monitor of the present invention;
FIG. 3 is a schematic view of the nasal oxygen cannula assembly of the present invention;
FIG. 4 is a schematic diagram of a system framework of the present invention.
The reference numerals in the figures illustrate:
1. The device comprises a monitor, a gas pump, a suction pipe, a nasal oxygen pipe assembly, a main 601, an oxygen delivery pipe, a main 602, an oxygen interface, a subsidiary 603, a main 604, a main 605, a first 606, a transition joint, a 607, an adjusting ring, a 608, a double-head pipe, a 609, a nasal obstruction, a 610, a nasal obstruction, a 611, a buccal breathing obstruction, a 612, a subsidiary 613, and a second 613.
Detailed Description
In order to facilitate the understanding of the technical scheme of the present invention by those skilled in the art, the technical scheme of the present invention will be further described with reference to the accompanying drawings.
Example 1:
as shown in fig. 1-4, an end-tidal carbon dioxide monitoring system, comprising:
the pulse monitoring module is used for acquiring pulse information of a patient;
The sampling mode switching module is connected with the pulse monitoring module and controls the operation of the two groups or the single group of air pumps 3 to adjust the sampling mode of the carbon dioxide according to the existence of the pulse;
The carbon dioxide analysis module is connected with the sampling mode switching module and is used for analyzing the collected carbon dioxide;
the cardiopulmonary resuscitation evaluation module is connected with the carbon dioxide analysis module, and the cardiopulmonary resuscitation quality of the patient is evaluated through the analysis result of the carbon dioxide by the carbon dioxide analysis module;
the prognosis effect judging module is connected with the carbon dioxide analyzing module and judges the prognosis effect of the patient according to the analysis result of the carbon dioxide by the carbon dioxide analyzing module;
The resuscitation termination prediction module is connected with the carbon dioxide analysis module, and predicts the termination cardiopulmonary resuscitation time through the analysis result of the carbon dioxide by the carbon dioxide analysis module;
The decision making module is connected with the carbon dioxide analysis module, the cardiopulmonary resuscitation evaluation module, the prognosis effect judgment module and the resuscitation termination estimation module and is used for making a corresponding strategy based on an analysis result;
and the information output module is connected with the decision making module and is used for outputting related information.
In an embodiment of the present invention, the sampling mode switching module includes:
The double-path sampling unit is used for synchronously sampling carbon dioxide at the mouth and the nose through double channels when the pulse monitoring module detects the existence of pulse;
The single-channel sampling unit is used for sampling carbon dioxide at the mouth or the nose through a single channel when the pulse monitoring module detects that the pulse does not exist;
The two-channel sampling can be realized by controlling the two groups of air pumps 3 to operate and simultaneously sampling the carbon dioxide in the first carbon dioxide interface 605 and the second carbon dioxide interface 613;
The single-channel sampling can be realized by controlling the operation of the single-group air pump 3 to sample the carbon dioxide in the first carbon dioxide interface 605 or the second carbon dioxide interface 613;
the carbon dioxide analysis module includes:
a concentration acquisition unit for acquiring carbon dioxide concentration information and generating a carbon dioxide concentration curve;
The difference value calculation unit is used for calculating the difference value of the carbon dioxide concentration acquired by the two-way sampling unit and the one-way sampling unit and generating a difference value curve;
a retention judgment unit for judging the retention condition of the carbon dioxide by the calculated carbon dioxide concentration difference value of the difference value calculation unit;
a waveform analysis unit for analyzing the difference curve generated by the difference calculation unit;
The cardiac resuscitation evaluation module includes:
By monitoring the fluctuation frequency of the concentration of end-tidal carbon dioxide in the waveform analysis unitEstimating cardiopulmonary resuscitation compression frequencyIs provided;
By amplitude of change in end-tidal carbon dioxide concentrationDepth of pressA compression depth analysis unit that establishes an analysis model to analyze whether the compression depth is sufficient;
A ventilation effect analysis unit that evaluates whether ventilation is effective or not by the form and concentration value of the end-of-breath carbon dioxide concentration curve;
the prognosis effect judging module comprises:
a trend analysis unit for judging prognosis by analyzing the change trend of the concentration of carbon dioxide at the end of breath in a period of time;
a stability analysis unit for judging the stability of the trend analysis unit by calculating the variance of the carbon dioxide concentration curve and deducing prognosis;
The resuscitation termination estimation module comprises:
a threshold judgment unit for judging whether to consider terminating cardiopulmonary resuscitation by judging whether the concentration of carbon dioxide at the end of breath exceeds a preset threshold;
Comprehensively consider pulse informationDifference in carbon dioxide concentrationAnd waveform informationConstructing a prediction model for stopping resuscitation opportunityMulti-parameter integration unit of (a);
The decision making module comprises:
A prompt tone generating unit for generating corresponding prompt tone information according to different judging results;
A display information generating unit that generates various types of information for display;
the information output module includes:
The display screen is connected with the display information generating unit and generates display information;
And the loudspeaker is connected with the prompt tone generating unit and used for broadcasting the generated prompt tone information.
In the embodiment of the invention, the concentration acquisition unit respectively acquires the carbon dioxide concentration of the two-way sampling unit and the one-way sampling unit at the sampling moment by taking 0.5 second as one sampling period, converts the carbon dioxide concentration into a carbon dioxide concentration curve, and further generates a first carbon dioxide concentrationAnd a second carbon dioxide concentration;
The difference calculating unit calculates the difference according to the first carbon dioxide concentrationAnd a second carbon dioxide concentrationCalculating the differenceAnd obtaining a difference curve.
In an embodiment of the present invention, in the retention determination unit, when the first carbon dioxide concentration isAnd a second carbon dioxide concentrationAre allAnd less than or equal toWhen the exhaled carbon dioxide retention is judged to be absent, wherein,AndAre all constant in carbon dioxide concentration, andIs 30mmHg of the sample, and is not limited to the sample,40MmHg when the first carbon dioxide concentrationAnd a second carbon dioxide concentrationAre all greater than or equal toWhen the exhaled carbon dioxide retention exists, judging;
when judging that the expired carbon dioxide retention does not exist, the waveform analysis unit acquires the end-tidal carbon dioxide waveform and the end-tidal carbon dioxide concentration, and sends the end-tidal carbon dioxide waveform and the end-tidal carbon dioxide concentration to the information output module for display and broadcasting;
When judging that the expired carbon dioxide retention exists, the waveform analysis unit further acquires a difference curve to generate end-tidal carbon dioxide waveform information, and meanwhile, the prompting sound generation unit of the decision making module generates prompting sound information and sends the prompting sound information and the prompting sound information to the information output module.
In the embodiment of the present invention, the compression frequency analysis unit analyzes the pressure by monitoring the fluctuation frequency of the carbon dioxide concentration in the waveform analysis unitEstimating cardiopulmonary resuscitation compression frequencyFrequency of pressingAnd wave frequencyThere is an approximate relationship that is present,Wherein, the method comprises the steps of, wherein,AndJudging whether the coefficient obtained by fitting a large amount of experimental data is in a reasonable frequency range, such as 100-120 times per minute, if not, prompting abnormal pressing frequency, and analyzing the variation amplitude of the carbon dioxide concentration in the pressing depth analysis unitDepth of pressThe correlation model of (2) is: Wherein, the method comprises the steps of, wherein,Is of empirical coefficient, differentCoefficients corresponding to different powers of the power,For polynomial times, generally taking 2 or 3, analyzing whether the current pressing depth is enough, and prompting that the pressing depth is insufficient when the concentration variation amplitude is smaller and lasts for a period of time; in the ventilation effect analysis unit, a ventilation effect evaluation indexWherein, the method comprises the steps of, wherein,For the end-tidal carbon dioxide concentration,Is the concentration value of each point on the curve,In order to obtain an average concentration of the water,For sampling the number of points whenAt 0.5-1.5, the ventilation effect is better.
In the embodiment of the present invention, in the trend analysis unit, the time series is set as,,......,The corresponding end-tidal carbon dioxide concentration is,,......,Trend determination is performed by calculating a slopeWhen (when)And is also provided withThe prognosis is better whenAnd is also provided withThe prognosis is poor, wherein,AndRespectively time seriesAndA corresponding end-tidal carbon dioxide concentration value,The stability analysis unit monitors the stability of the carbon dioxide concentration curve and the stability indexBy calculating the variance of the concentration curveThe product can be obtained by the method,When (when)Less than a threshold valueAnd the stability is better during the process.
In the embodiment of the invention, the threshold value judging unit prompts that the cardiopulmonary resuscitation can be considered to be terminated when the end-tidal carbon dioxide concentration value is continuously higher than 40mmHg for 5 minutes and is accompanied by stable pulse and spontaneous respiratory recovery signs, and the resuscitation can be considered to be terminated when the concentration is continuously lower than 10mmHg and the sufficient resuscitation effort is still not improved, wherein the duration is set as followsWhen (when)And is also provided withAnd pulse and respiration recovery, taking into account termination whenAnd the prediction model for stopping the resuscitation time in the multi-parameter integrated unitWherein, the method comprises the steps of, wherein,,,AndIn order to train the obtained parameters by using a large amount of clinical data through a machine learning algorithm, when the model output result reaches a preset termination condition, an early warning of termination of resuscitation is sent out.
In the embodiment of the invention, the prompt tone generating unit generates different prompt messages according to different carbon dioxide concentration difference ranges, wherein the prompt resuscitation mode is to increase positive pressure to supply oxygen when the first exhaled carbon dioxide concentration difference value and the second exhaled carbon dioxide concentration difference value are both more than or equal to 50mmHg, and the prompt value is that the oxygen partial pressure is increased by 5-10The prompt mode is to keep the current state when the difference value of the concentration of the first exhaled carbon dioxide and the difference value of the concentration of the second exhaled carbon dioxide are both more than or equal to 40mmHg and less than 50mmHg, and the prompt mode is to properly increase oxygen when the difference value of the concentration of the first exhaled carbon dioxide and the difference value of the concentration of the second exhaled carbon dioxide are both more than or equal to 30mmHg and less than 40mmHg, and the prompt value is to increase by 2-5When the difference value of the concentration of the first exhaled carbon dioxide and the difference value of the concentration of the second exhaled carbon dioxide are both more than or equal to 20mmHg and less than 30mmHg, the prompting mode is to increase positive pressure to supply oxygen, and the prompting numerical value is to increase by 1-2When the first exhaled carbon dioxide concentration difference value and the second exhaled carbon dioxide concentration difference value are both smaller than 20mmHg, the prompting mode is a maintenance state;
In the embodiment of the invention, when the carbon dioxide concentration difference curve has an expired carbon dioxide concentration difference waveform, the waveform analysis unit acquires the end-tidal carbon dioxide concentration and the prompt tone information, wherein the prompt numerical range value in the prompt tone information is 0-60mmHg, and the preferable numerical values are 0, 5,10, 20, 30, 40, 50 and 60;
In the embodiment of the invention, the decision-making module generates different display and prompt information according to different end-tidal carbon dioxide concentrations, wherein the display information generation unit generates prompt numerical information to be immediately cardiopulmonary resuscitation when the concentration of the expired carbon dioxide is more than 60mmHg or less than or equal to 0mmHg, the prompt numerical value is set to 0, the prompt numerical information is displayed through a display screen of the information output module and broadcasted through a loudspeaker, the display information generation unit generates the prompt numerical information to be stopped pressing when the concentration of the expired carbon dioxide is more than or equal to 50mmHg and is displayed through the display screen of the information output module, and the display information generation unit generates the prompt numerical information to be continuously pressed when the concentration of the expired carbon dioxide is more than or equal to 0mmHg and less than or equal to 50mmHg and is displayed through the display screen of the information output module.
Example 2:
as shown in fig. 1-4, a carbon dioxide end-tidal monitoring nasal oxygen cannula includes a nasal oxygen cannula assembly 6 with a monitor 1 removably attached at an end;
The nasal oxygen cannula assembly 6 comprises a double-ended tube 608 with a gas delivery nasal plug 609 and a gas discharge nasal plug 610 symmetrically formed on the outer edge surface, the middle part of the double-ended tube 608 is closed, one end of the double-ended tube 608 is connected with a carbon dioxide collecting main tube 604 communicated with the gas discharge nasal plug 610, one end of the carbon dioxide collecting main tube 604 far away from the double-ended tube 608 is connected with a carbon dioxide interface I605, and the nasal oxygen cannula assembly 6 also comprises a carbon dioxide collecting auxiliary tube 612 with two ends respectively connected with a buccal breathing plug 611 and a carbon dioxide interface II 613;
The inside of the monitor 1 is provided with a monitor 2, the inside of the monitor 1 is symmetrically provided with two groups of air pumps 3, two groups of air pumps 3 are connected with a suction pipe 4 and a suction pipe 5 at two ends, the suction pipe 4 is connected with the monitor 2, a first carbon dioxide interface 605 and a second carbon dioxide interface 613 are respectively and detachably connected with the suction pipe 5, and a pulse monitoring module, a sampling mode switching module, a carbon dioxide analysis module, a cardiopulmonary resuscitation evaluation module, a prognosis effect judgment module, a resuscitation termination estimation module, a decision making module and an information output module are uniformly arranged in the monitor 2;
The nasal oxygen cannula assembly 6 further comprises a transition joint 606, wherein the interior of the transition joint 606 is communicated with an oxygen therapy auxiliary tube 603 and an oxygen therapy main tube 601, the carbon dioxide collection main tube 604 is communicated with the transition joint 606, one end, far away from the transition joint 606, of the oxygen therapy auxiliary tube 603 is communicated with a double-end tube 608, one end, far away from the transition joint 606, of the oxygen therapy main tube 601 is connected with an oxygen interface 602, an air delivery nasal plug 609 and an air discharge nasal plug 610 are respectively communicated with the oxygen therapy auxiliary tube 603 and the carbon dioxide collection main tube 604, and an adjusting ring 607 is movably sleeved on the outer edge surface of the connecting section of the oxygen therapy auxiliary tube 603 and the carbon dioxide collection main tube 604;
The oxygen interface 602 is connected to an external oxygenation device for oxygenation of a patient with cardiac arrest;
The embodiments of the present invention are disclosed as preferred embodiments, but not limited thereto, and those skilled in the art will readily appreciate from the foregoing description that various modifications and variations can be made without departing from the spirit of the present invention.