End-expiratory carbon dioxide concentration sampling tube

Abstract

The utility model relates to the field of medical monitoring equipment, and discloses an end-expiratory carbon dioxide concentration sampling tube, which comprises a nasal expiration sampling unit, a mouth expiration sampling unit and a contrast unit, the nasal expiration sampling unit comprises a first sampling tube and a nasal expiration sampling head communicated with the first sampling tube, and the nasal expiration sampling head comprises a nasal suction tube inserted into the nasal cavity of a patient. The mouth-exhaling sampling unit comprises a second sampling pipe and a mouth-exhaling sampling head communicated with the second sampling pipe; the contrast unit comprises a third sampling pipe with one end communicated with the atmosphere. According to the utility model, nose expiration gas, mouth expiration gas and air are simultaneously collected, so that the accuracy and comprehensiveness of end-expiration carbon dioxide monitoring are ensured, possible errors caused by single-channel monitoring are effectively avoided, the change of end-expiration carbon dioxide concentration of a patient is accurately reflected in real time, various breathing modes are adapted, the dependence of a breathing machine and the loss of medical resources are reduced, and the working efficiency is improved. And meanwhile, the influence of environmental factors on monitoring is reduced.

Description

Technical Field

[0001] The utility model relates to the field of medical monitoring equipment, in particular to an end-tidal carbon dioxide concentration sampling tube. Background Art

[0002] End tidal carbon dioxide (ETCO2) monitoring refers to the use of a carbon dioxide (CO2) monitoring instrument to monitor the CO2 concentration or pressure in the patient's exhaled gas. In addition to displaying the CO2 concentration or pressure in real time, the CO2 concentration or pressure can also be recorded as a graph, and a series of ETCO2-related parameters are derived by combining concentration indicators and waveform characteristics for calculation, thereby obtaining information on the patient's ventilation / ventilation function, cardiac output, ventilation / perfusion (V / Q) status and metabolism.

[0003] At present, for patients in the recovery period of anesthesia, it is generally necessary to monitor the content of end-tidal carbon dioxide. For example, Chinese patent, publication number: CN208355884U discloses a nasal oxygen cannula that can detect the concentration of end-tidal carbon dioxide, including a nasal plug body, a vertical diaphragm is provided in the cavity inside the nasal plug body, and the diaphragm divides the cavity of the nasal plug body into a first chamber and a second chamber. The nasal plug body is provided with an oral sampling tube for collecting carbon dioxide exhaled from the oral cavity on the side opposite to the nasal cannula, and the oral sampling tube is connected to the second chamber. The outer ends of the two nasal cannula are respectively provided with a protruding annular seal. Thus, while one nasal cavity supplies oxygen, the carbon dioxide exhaled from the other nasal cavity and oral cavity of the patient is collected. However, our lungs need both moist and warm air, so one of the main functions of the nose is to warm and humidify all the air entering the lungs. In order to achieve this, the nostrils need to maintain humidity and heat at all times. If air is allowed to enter without interruption and the nasal cavity is always kept in working condition, the mucosa in the nasal cavity will become dry or even rupture, causing nose bleeding and nasal diseases, and even affecting the sense of smell. Therefore, our body uses the autonomic nervous system to regulate the two nostrils to alternately take over the breathing task, which is the nasal cycle. Due to the existence of the nasal cycle, when breathing through the nose, people usually use one nostril as the main nostril and the other nostril as the auxiliary nostril. Long-term use of the above-mentioned nasal oxygen tube to monitor the patient's end-tidal carbon dioxide concentration not only requires additional oxygen supply, but may also cause problems in the patient's nasal cavity. However, at present, most patients in clinical practice do not need additional oxygen supply. Monitoring the patient's end-tidal carbon dioxide is only to understand the patient's metabolism and predict the patient's physical condition. However, monitoring the carbon dioxide concentration and then monitoring the patient's physical condition, in order to avoid the atmosphere from interfering with the end-tidal carbon dioxide concentration, has to supply the patient with additional oxygen, which may not only cause excessive drying of the unilateral nasal cavity, causing nosebleeds and nasal diseases, but also an additional burden on the cost of oxygen. Utility Model Content

[0004] The utility model aims to provide an end-tidal carbon dioxide concentration sampling tube to reduce the monitoring cost of end-tidal carbon dioxide, thereby reducing the burden on patients.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an end-tidal carbon dioxide concentration sampling tube, including a nasal sampling unit, an oral sampling unit and a control unit, the nasal sampling unit including a first sampling tube and a nasal sampling head connected to the first sampling tube, the nasal sampling head including a nasal suction tube inserted into the patient's nasal cavity, the oral sampling unit second sampling tube and an oral sampling head connected to the second sampling tube, the control unit including a third sampling tube with one end connected to the atmosphere.

[0006] The beneficial effects of this scheme are: 1. The first sampling tube and the second sampling tube are used to simultaneously collect nasal and oral gases, thereby improving the accuracy of sample collection, improving the accuracy of end-tidal carbon dioxide collection, and covering the nasal cavity and the oral cavity at the same time. Regardless of whether the patient is simply breathing through the nose, breathing through the mouth, inhaling from the nose and exhaling from the mouth, or exhaling from the nose and inhaling from the mouth, the exhaled carbon dioxide can be collected and tested, avoiding the monitoring error that may be caused by relying solely on a single exhalation channel, ensuring that no matter whether the patient breathes mainly through the nose or through the mouth, the change in the end-tidal carbon dioxide concentration can be accurately captured, thereby monitoring the patient's physiological characteristics through the end-tidal carbon dioxide, without affecting the patient's spontaneous breathing, reducing the use of ventilators, reducing the loss of medical resources, and thus reducing the patient's medical burden. At the same time, the dual-channel design enables the sampling tube to collect exhaled gases from two different sources at the same time, reflecting the patient's true concentration of end-tidal carbon dioxide in real time, thereby improving the timeliness and representativeness of the monitoring data.

[0007] 2. Through the detection of the atmosphere, the carbon dioxide content in the air under normal circumstances is determined. The carbon dioxide content in the atmosphere is extracted and detected in real time through the third sampling tube, which provides a reliable reference benchmark for the detection of exhaled carbon dioxide, helps to more accurately distinguish and calculate the actual increase of carbon dioxide in the patient's exhaled breath, so as to make an accurate assessment of the patient's respiratory metabolic state, thereby avoiding misjudgment of instruments and equipment due to excessively high carbon dioxide concentrations in the air. Real-time monitoring of the carbon dioxide concentration in the atmosphere helps to calibrate the monitoring equipment, ensure the accuracy of its test results, reduce errors caused by equipment drift or environmental changes, and improve the credibility and consistency of the monitoring data. Through real-time monitoring of the atmospheric carbon dioxide concentration, the patient's respiratory physiological changes can be more keenly identified, especially when there are subtle fluctuations in carbon dioxide concentrations, abnormalities can be detected faster and more accurately, thereby helping clinicians make timely and correct judgments on the patient's condition. At the same time, the integration of the control unit in the monitoring equipment simplifies the preparation work before the test and the calibration steps during the test, improves the convenience and practicality of the entire detection system, and helps to speed up the clinical diagnosis and treatment process.

[0008] Furthermore, it also includes a detector, which includes three detection positions, and the detection positions are respectively connected to the first sampling tube, the second gas sampling tube and the third sampling tube.

[0009] Beneficial effects: Through three independent detection positions, nasal breathing, oral breathing and the concentration of carbon dioxide in the atmosphere can be distinguished and accurately monitored in real time, so as to accurately judge the patient's breathing pattern. For example, when the test results show that the patient is only breathing through the nose, you can choose to turn off the detection position for oral breathing sampling, and only keep nasal breathing sampling and atmospheric control sampling, so as to achieve personalized monitoring and more targeted. Through separate sampling tests, the patient's breathing pattern can be confirmed. If the patient is only breathing through the nose, the detection position for detecting oral breathing can be turned off, which is more targeted. At the same time, it can also reduce the consumption of testing and reduce the consumption of resources; for patients with different breathing patterns, this device can provide more detailed and targeted data analysis, helping medical staff to more accurately evaluate the patient's lung function, ventilation status and systemic metabolic status, so as to formulate a more reasonable treatment plan; the flexible detection position design allows medical staff to quickly adjust the detection strategy according to the specific situation of the patient, which improves the flexibility and practicality of the equipment and provides more possibilities for clinical diagnosis and treatment.

[0010] Furthermore, the nasal exhalation sampling head and the oral exhalation sampling head are rotatably connected, and an ear hook fixing piece is slidably arranged between the first sampling tube and the second sampling tube.

[0011] Beneficial effects: The nasal exhalation sampling head and the oral exhalation sampling head are rotatably connected, and an ear-hook fixing piece is slidably provided, so that the first sampling tube and the second sampling tube form an annular structure. By adjusting the position of the ear-hook fixing piece, the ear-hook fixing piece can slide along the first sampling tube and the second sampling tube, so as to find the best fixed position behind the patient's head, ensuring that the sampling tube can still remain stable when the patient is active (such as turning over, changing sleeping position, etc.), significantly reducing the risk of accidental detachment of the sampling tube, and ensuring continuous and accurate monitoring effects; through the rotating connection design, medical staff can flexibly adjust the angle and position of the first sampling tube and the second sampling tube according to the specific conditions of the patient's head and face, so that the sampling tube can be worn more closely on the patient's face, improving wearing comfort and sampling efficiency; this rotatable and sliding structural design fully considers the actual needs of patients during bed rest, which not only reduces the discomfort of patients, but also helps medical staff to successfully complete sampling and monitoring tasks without affecting the rest of patients, reflecting the people-oriented medical concept.

[0012] Furthermore, the detector includes an air outlet, which is connected to the detection position, and the air outlet is connected to an air pump, and the air pumping speed of the air pump is 20-300ml / min.

[0013] Beneficial effects: By setting up a vacuum pump, an active and efficient gas collection mechanism is realized, which overcomes the uncertainty of sampling by relying solely on the patient's natural breathing and expelling gas, improves the gas collection efficiency, and ensures the real-time and accuracy of the monitoring data; the vacuum pump's vacuum speed can be adjusted within the range of 20-300 ml / min according to actual needs, which means that the vacuum rate can be flexibly adjusted according to factors such as the patient's breathing condition and gas flow, ensuring the effective capture of gas samples and avoiding sample loss or dilution due to too fast or too slow vacuuming; through the negative pressure effect of the vacuum pump, the gas sample can be quickly and stably transmitted to the monitoring position for analysis, which not only shortens the response time, but also optimizes the entire monitoring process, which is conducive to medical staff to obtain and interpret monitoring data in a timely manner, so as to make accurate clinical decisions.

[0014] Furthermore, the detector is an infrared detection device.

[0015] Beneficial effects: Infrared detection technology has the characteristics of fast response speed and high detection efficiency. It can accurately measure the carbon dioxide concentration in the exhaled airflow in a short time, greatly improving the monitoring efficiency. It is especially suitable for continuous and real-time online monitoring of patients' exhaled gas. Infrared detection has high detection accuracy for gas components, especially for mobile gases such as exhaled airflow. The accuracy and stability of its detection results are excellent. This plays a vital role in accurately evaluating the patient's respiratory function, circulatory status and metabolic status. Infrared detection technology has strong reliability, relatively low maintenance cost, and good durability. It is suitable for long-term continuous operation of medical monitoring equipment, which is conducive to medical institutions to effectively control operating costs while ensuring monitoring quality.

[0016] Furthermore, it also includes a condensation check structure, which includes a one-way valve and a dehumidification unit connected in sequence. The condensation check structure is respectively arranged at the ends of the first sampling tube, the second sampling tube and the third sampling tube and is connected to the detection position.

[0017] Beneficial effects: The dehumidification unit can effectively absorb and reduce the moisture content in the exhaled gas, thereby reducing the humidity of the gas. Excessive humidity may affect the test results, especially for the determination of carbon dioxide concentration. Excessive humidity will increase the solubility of carbon dioxide in water and affect the accuracy of the test; by reducing the humidity of the gas, the amount of carbon dioxide dissolved in moisture is reduced, thereby improving the accuracy of carbon dioxide concentration detection. Dry gas samples can more truly reflect the actual content of carbon dioxide in the patient's exhaled gas; dehumidified gas samples can be detected faster through the monitoring equipment, reducing the impact of moisture on the detection sensor, making the detection response faster and the data update frequency higher, thereby effectively improving the detection efficiency of the monitoring equipment; the dehumidification unit can also reduce the erosion of moisture on the internal components of the monitoring equipment, avoiding equipment failure or performance degradation caused by moisture condensation, thereby extending the service life of the equipment. At the same time, the presence of the one-way valve can prevent the possible contamination source inside the detector from flowing back to the patient's respiratory system through the sampling pipeline, enhancing the safety of the entire monitoring process; through reasonable gas flow control, the monitoring equipment can continuously and stably receive gas samples from the patient's exhaled gas, further improving the monitoring efficiency and data quality.

[0018] Furthermore, it includes a detector with two detection positions and a condensation check structure, the third sampling tube is connected to one detection position, a tee is connected between the first sampling tube and the second sampling tube, and the tee is connected to the other detection position.

[0019] Beneficial effects: The three-way assembly realizes the centralized collection and transmission of nasal and oral exhaled gases, simplifies the structure of the sampling system, and facilitates management and operation; the added condensation check structure ensures that the gas can only flow along the predetermined direction (i.e., from the patient's exhaled gas to the detector), effectively preventing the reverse reflux of the gas after sampling, thereby avoiding cross-contamination of samples and ensuring the accuracy of each sampling result; the existence of the condensation check structure can prevent possible contamination sources inside the monitoring equipment from flowing back into the patient's respiratory system through the sampling pipeline, thereby enhancing the safety of the entire monitoring process; through reasonable gas flow direction control, the monitoring equipment can continuously and stably receive gas samples exhaled by the patient, further improving the monitoring efficiency and data quality.

[0020] Furthermore, the oral sampling head is provided with an arc-shaped sampling cover.

[0021] Beneficial effects: The arc-shaped sampling hood can better adapt to and cover the patient's mouth because its opening shape is similar to the contour of human lips, thereby ensuring that the collected exhaled gas samples are closer to the patient's mouth exhaled airflow, improving the accuracy and representativeness of sample collection; the arc-shaped sampling hood design can maximize the capture of gas exhaled from the mouth, avoid gas escape, make the sampling process more efficient, and also facilitate the continuous monitoring and real-time analysis of the patient's mouth exhaled airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of Example 1 of the utility model;

[0023] Figure 2 It is a three-dimensional diagram of Example 2 of the utility model;

[0024] Figure 3 This is a three-dimensional diagram of Example 3 of the utility model. DETAILED DESCRIPTION

[0025] The following is further described in detail through specific implementation methods:

[0026] The reference numerals in the drawings of the specification include: nasal exhalation sampling head body 11, protrusion 111, first sampling tube 12, nasal suction head 13, oral exhalation sampling head body 21, second sampling tube 22, connecting tube 23, arc-shaped sampling cover 231, ear hook fixing part 3, tee 4.

[0027] Example 1

[0028] Embodiment 1 is basically as attached Figure 1 As shown, Figure 1 The end-tidal carbon dioxide concentration sampling tube shown in the figure includes an ear-hook fixing part 3, a nasal exhalation sampling unit, an oral exhalation sampling unit and a control unit. The ear-hook fixing part 3 is provided with two through holes, such as Figure 1 As shown, the nasal sampling unit includes a first sampling tube 12 and a nasal sampling head. The nasal sampling head includes a nasal sampling head body 11, with two nasal suction tips 13 bonded or integrally formed in the middle. The material of the nasal suction tips 13 is preferably soft polytetrafluoroethylene, so that the spacing of the nasal suction tips 13 can be adjusted by bending the nasal suction tips 13 to ensure that the spacing of the nasal suction tips 13 can be adjusted between 1-4 cm to adapt to the patient's nostril spacing, so that medical staff can adjust the spacing of the nasal suction tips 13 and insert them into the patient's nasal cavity gap to avoid compression of the patient due to the insertion of the nasal suction tips 13, resulting in discomfort. The first sampling tube 12 is bonded or clamped to the right end of the nasal sampling head body 11, preferably clamped, and the ear hook fixing part 3 is slidably arranged on the first sampling tube 12 through a through hole. The first sampling tube 12 is a flexible medical hose, preferably a latex tube.

[0029] The oral-exhaled sampling unit includes a second sampling tube 22 and an oral-exhaled sampling head. The second sampling tube 22 is made of the same material as the first sampling tube 12. The oral-exhaled sampling head includes an oral-exhaled sampling head body 21 and an arc-shaped sampling cover 231. A connecting tube 23 is provided between the oral-exhaled sampling head body 21 and the arc-shaped sampling cover 231, so as to connect the arc-shaped sampling cover 231 with the oral-exhaled sampling head body 21, and then introduce the sample collected by the arc-shaped sampling cover 231 into subsequent equipment through the second sampling tube 22, such as Figure 1 As shown, one end of the second sampling tube 22 is bonded or clamped on the oral sampling head body 21, preferably clamped, and the other end slides through the through hole on the ear hook fixing member 3. Figure 2 As shown, a protrusion 111 is provided at the left end of the nasal exhalation sampling head body 11, and a groove adapted to the protrusion 111 is provided at the right end of the oral exhalation sampling head body 21. The protrusion 111 is rotatably set in the groove, so that the oral exhalation sampling head and the nasal exhalation sampling head can be rotated to a certain extent, thereby adjusting the fit between the arc-shaped sampling cover 231 and the patient's mouth.

[0030] The control unit includes a third sampling tube with one end connected to the atmosphere, and one end of the third sampling tube is connected to the air, so as to avoid the high concentration of collected carbon dioxide when there are many accompanying personnel in the ward, which will cause misjudgment of the monitoring equipment. At the same time, the indoor air quality can also be evaluated, ventilation can be carried out in time, and the indoor air quality can be maintained.

[0031] During use: First, the medical staff assembles the equipment in the prescribed style, and preliminarily adjusts the size of the annular structure composed of the first sampling tube 12 and the second sampling tube 22 through the ear hook fixture 3, so that the annular structure is adapted to the size of the patient's head; then, adjust the spacing of the nasal suction tip 13, insert the nasal suction tip 13 into the patient's nasal cavity, and rotate the oral exhalation sampling head body 21 so that the arc-shaped sampling cover 231 covers the patient's lips, and the third sampling tube is fixed to the area of ​​the bed close to the patient's head, so as to sample the nasal cavity, oral cavity and atmosphere respectively, thereby reducing the monitoring error caused by different exhalation patterns of the patient.

[0032] Example 2

[0033] Reference Figure 2 Embodiment 2 is basically the same as embodiment 1, except that the ends of the first sampling tube 12 and the second sampling tube 22 are connected by a tee 4, so that the exhaled air collected from the oral cavity and nasal cavity of the patient is combined, realizing the centralized collection and transmission of nasal and oral exhaled air, simplifying the structure of the sampling system, and facilitating management and operation.

[0034] Example 3

[0035] like Figure 3As shown, Example 3 is basically the same as Example 1, except that the connecting tube 23 of the oral exhalation sampling unit is arranged in the middle of the nasal exhalation sampling body, so that the sampling tubes are arranged symmetrically, thereby reducing the deflection of the arc-shaped sampling cover 231 when the patient turns over, resulting in reduced sampling accuracy.

[0036] Example 4

[0037] On the basis of Example 1, the monitoring device also includes a processor module, a display module and an alarm module. The processor module is electrically connected to the detection position, and the display module and the alarm module are both electrically connected to the processor module. During detection, the processor uses the carbon dioxide concentration in the air as a baseline, and the exhaled carbon dioxide concentration is displayed on the display module in the form of a waveform after deducting the baseline. At the same time, the processor module has a built-in carbon dioxide concentration range during normal exhalation. When the exhaled carbon dioxide concentration is lower or higher than the normal exhaled carbon dioxide concentration range (such as a deviation of 10% from the normal exhaled carbon dioxide concentration), the alarm module will send a signal to notify medical staff to deal with it in time.

[0038] Example 5

[0039] On the basis of Example 1, it also includes a monitoring system, which includes a detector and an air pump. The monitoring equipment is preferably an infrared detection equipment. The detector includes an air outlet, which is connected to the detection position. The detector is provided with three detection positions, which are respectively connected to the first sampling tube, the second gas sampling tube and the third sampling tube. The air outlet is connected to the monitoring position, and the air outlet is connected to the air pump. The air extraction speed of the air pump is 20-300ml / min.

[0040] The specific implementation process is as follows:

[0041] When in use, start the detector and the vacuum pump to monitor the patient's exhaled gas online. When the carbon dioxide in the patient's exhaled gas is significantly higher or lower than the normal content, medical staff can rescue the patient in advance.

[0042] Example 5

[0043] On the basis of Example 1, a condensation check structure is connected to the pipeline, and the condensation check structure includes a one-way valve and a dehumidification unit connected in sequence. The dehumidification unit is preferably a condenser, and the condenser includes a second air outlet, and the second air outlet is connected to the detection position, so as to reduce the humidity in the collected gas and avoid excessive humidity affecting the detection results.

[0044] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that the technical means for solving the problems in the above-mentioned embodiments of the utility model can be used in combination to solve multiple technical problems at the same time. For those skilled in the art, several deformations and improvements can be made without departing from the technical solution of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. End-tidal carbon dioxide concentration sampling tube, characterized by: It includes a nasal exhalation sampling unit, an oral exhalation sampling unit and a control unit. The nasal exhalation sampling unit includes a first sampling tube and a nasal exhalation sampling head connected to the first sampling tube. The nasal exhalation sampling head includes a nasal suction tube inserted into the patient's nasal cavity. The oral exhalation sampling unit includes a second sampling tube and an oral exhalation sampling head connected to the second sampling tube. The control unit includes a third sampling tube with one end connected to the atmosphere.

2. The end-tidal carbon dioxide concentration sampling tube according to claim 1, characterized in that: It also includes a detector, which includes three detection positions, and the detection positions are respectively connected to the first sampling tube, the second gas sampling tube and the third sampling tube.

3. The end-tidal carbon dioxide concentration sampling tube according to claim 2, characterized in that: The nasal exhalation sampling head and the oral exhalation sampling head are rotatably connected, and an ear hook fixing piece is slidably arranged between the first sampling tube and the second sampling tube.

4. The end-tidal carbon dioxide concentration sampling tube according to claim 3, characterized in that: The detector comprises an air outlet, which is connected with the detection position, and the air outlet is connected with an air pump, and the air pumping speed of the air pump is 20-300ml / min.

5. The end-tidal carbon dioxide concentration sampling tube according to claim 4, characterized in that: The detector is an infrared detection device.

6. The end-tidal carbon dioxide concentration sampling tube according to claim 5, characterized in that: It also includes a condensation check structure, which includes a one-way valve and a dehumidification unit that are connected in sequence. The condensation check structure is respectively arranged at the ends of the first sampling tube, the second sampling tube and the third sampling tube and is connected to the detection position.

7. The end-tidal carbon dioxide concentration sampling tube according to claim 1, characterized in that: The invention comprises a detector with two detection positions and a condensation check structure. The third sampling tube is connected with one detection position. A tee is connected between the first sampling tube and the second sampling tube, and the tee is connected with another detection position.

8. The end-tidal carbon dioxide concentration sampling tube according to claim 1, characterized in that: The oral sampling head is provided with an arc-shaped sampling cover.

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