Nasal end-expiratory carbon dioxide monitoring device for non-intubation general anesthesia

Abstract

The utility model relates to the field of medical monitoring and anesthesia, in particular to a nasal end-expiratory carbon dioxide monitoring device for non-intubation general anesthesia, which comprises a detection tube and a disposable nasal cannula, the disposable nasal cannula is detachably communicated with one end of the detection tube, an expiration sensor is mounted on the inner wall of the detection tube and electrically connected with a controller, and the controller is electrically connected with the nasal end-expiratory carbon dioxide monitoring device. The controller is electrically connected with an indicator lamp, the controller and the indicator lamp are installed on the detection tube, and the controller controls the indicator lamp to flicker along with the expiration times of carbon dioxide. The device can effectively monitor end-expiratory carbon dioxide in real time for sedative and analgesic patients with non-intubation and difficult airway anesthesia, can timely and effectively recognize and give an alarm for airway obstruction, and can effectively give an early warning for hypoxia.

Description

Technical Field

[0001] The utility model relates to the fields of medical monitoring and anesthesia, and in particular to a nasal end-tidal carbon dioxide monitoring device used in non-intubation general anesthesia. Background Art

[0002] In clinical anesthesia practice, anesthesia can be divided into two categories, intubation anesthesia and non-intubation anesthesia, depending on whether a tracheal tube needs to be inserted. Intubation anesthesia refers to an anesthesia method in which a tracheal tube is inserted during general anesthesia to maintain the patient's airway patency and perform mechanical ventilation. It is suitable for surgeries with a long operating time and requiring precise control of breathing and ventilation, such as cardiac surgery, abdominal surgery, and thoracic surgery. Non-intubation anesthesia refers to an anesthesia method in which a tracheal tube is not inserted to maintain the patient's airway patency during general anesthesia or local anesthesia. It is suitable for surgeries with a short operating time and no need for precise control of breathing, such as eye surgery, painless gastrointestinal endoscopy, and other surgeries and examinations.

[0003] Therefore, for patients undergoing intubation anesthesia, a carbon dioxide monitor will be connected to the branch outside the tracheal tube to monitor the patient's respiratory condition. For non-intubation anesthesia, since the patient can breathe independently, a blood oxygen saturation meter is generally used to clamp the patient's finger for monitoring. The inventors found in actual work that some patients are very prone to airway obstruction due to airway stenosis, leading to severe hypoxemia, carbon dioxide retention, arrhythmia and even cardiac arrest, and the blood oxygen saturation meter cannot respond to this situation in time. Therefore, there is an urgent need to develop a nasal end-tidal carbon dioxide monitoring device for non-intubation general anesthesia. Utility Model Content

[0004] The utility model is intended to provide a nasal end-tidal carbon dioxide monitoring device for non-intubation general anesthesia, so as to solve the problem that airway obstruction cannot be detected in time during surgery in patients undergoing non-intubation general anesthesia due to blood oxygen saturation detection.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A nasal end-tidal carbon dioxide monitoring device for use during non-intubation general anesthesia includes a detection tube and a disposable nasal cannula. The disposable nasal cannula is detachable and connected to one end of the detection tube. An exhalation sensor is installed on the inner wall of the detection tube. The exhalation sensor is electrically connected to a controller, and the controller is electrically connected to an indicator light. The controller and the indicator light are installed on the detection tube. The exhalation sensor is used to detect the carbon dioxide flow in the human nasal cavity and generate a detection signal to transmit to the controller. Each time the controller receives a signal from the gas sensor, the indicator light flashes once.

[0007] Preferably, as an improvement, the device further includes a first comparator, which is electrically connected to the controller. The exhalation sensor detects the carbon dioxide flow in the human nasal cavity and transmits the generated detection signal to the controller. After receiving the detection signal, the controller controls the first comparator to perform comparison processing. The first comparator outputs a corresponding level signal according to the detection signal. The controller controls the operating state of the indicator light based on the level signal. The operating state of the indicator light includes the following three states:

[0008] When the level signal is high, the indicator light flashes yellow;

[0009] When the level signal is at the middle level, the indicator light flashes green;

[0010] When the level signal is low, the indicator light flashes red.

[0011] Preferably, as an improvement, it also includes a second comparator, a timer and a counter. The second comparator, timer and counter are all electrically connected to the controller. After receiving the detection signal, the controller controls the timer to perform timing processing and the counter to perform counting processing, and controls the second comparator to perform comparison processing after the timing ends. The second comparator outputs a corresponding level signal according to the counting comparison result, and the controller controls the indicator light to flash red according to the level signal.

[0012] Preferably, as an improvement, an internal thread is provided on the inner wall of the disposable nasal cannula, an external thread is provided on the outer wall of the detection tube, and the disposable nasal cannula is threadedly connected to the detection tube.

[0013] Preferably, as an improvement, the disposable nasal cannula is conical and the large diameter end is connected to the detection tube.

[0014] Preferably, as an improvement, an air bag is provided on the outer wall of the disposable nasal cannula, the air bag is fixed on the outer wall of the large diameter end of the disposable nasal cannula, the air bag is connected to the trachea, and a sealing plug is detachably connected to the trachea.

[0015] The principles and beneficial effects of this program are:

[0016] 1. This solution uses a disposable nasal cannula, which is inserted directly into the patient's nasal cavity to measure end-tidal carbon dioxide. Compared to testing with a blood oxygen saturation meter, this solution directly detects end-tidal carbon dioxide in the patient's nasal cavity, allowing for timely detection of airway obstruction. Furthermore, this solution is convenient to use, as it can be inserted directly into the patient's nasal cavity without requiring an external monitor, and does not affect the patient's normal activities or the need to wear an oxygen mask.

[0017] 2. This solution sets an indicator light on the detection tube. The indicator light can flash green, yellow or red according to the patient's exhalation situation, making it convenient for medical staff to check the changes in the patient's exhalation situation. It can perform real-time and effective end-tidal carbon dioxide monitoring for non-intubated patients undergoing sedation and analgesia and difficult airway anesthesia patients, can promptly and effectively identify and alarm airway obstruction, and can effectively warn of the occurrence of hypoxia.

[0018] When the patient breathes normally, carbon dioxide gas passes through the detection tube during the exhalation phase, but no carbon dioxide gas is present during the inhalation phase. The exhalation sensor detects carbon dioxide gas and sends a detection signal to the controller. After receiving the detection signal, the controller controls the first comparator to perform comparison processing. The first comparator outputs a corresponding level signal based on the detection signal. The controller then controls the operating state of the indicator light based on the level signal. When the level signal is high (end-tidal carbon dioxide partial pressure > 45 mmHg), the indicator light flashes yellow; when the level signal is medium (end-tidal carbon dioxide partial pressure between 35-45 mmHg), the indicator light flashes green; and when the level signal is low (end-tidal carbon dioxide partial pressure < 35 mmHg), the indicator light flashes red. In addition, after receiving the detection signal, the controller also controls the timer to perform timing processing (1 minute) and the counter to perform counting processing. After the timing ends, it controls the second comparator to perform comparison processing. The second comparator outputs a level signal based on the counting result. When the counting result is less than 12 times, the second comparator outputs a low level signal. The controller controls the indicator light to flash red based on the low level signal.

[0019] 3. The disposable nasal cannula is threadedly connected to the detection tube, which is stable and easy to assemble and disassemble. After use, the disposable nasal cannula can be removed and discarded, and the detection tube can be reused.

[0020] 4. The disposable nasal cannula is set to be conical and the large diameter end is connected to the detection tube, so that the disposable nasal cannula is easy to connect with the nasopharyngeal ventilation tube. Therefore, this solution can also be used when the nasopharyngeal ventilation tube is inserted, and has a wider range of applicability.

[0021] 5. This solution sets an airbag on the disposable nasal cannula. After removing the sealing plug, the airbag can be inflated through the trachea with an empty needle. The inflated airbag can make the disposable nasal cannula better expand and tighten in the nasal cavity, thereby improving the stability of the disposable nasal cannula. In addition, the airbag is relatively soft and will not cause damage to the patient's nasal mucosa. Moreover, by adjusting the inflation volume of the airbag, it can also be suitable for different patients, with a wide range of uses.

[0022] 6. The airbag is arranged on the outer wall of the large-diameter end of the disposable nasal cannula. When the disposable nasal cannula is connected to the nasopharyngeal airway, the airbag is located at the tube opening of the nasopharyngeal airway. The inflated airbag can, on the one hand, expand and tighten in the patient's nasal cavity to improve the stability of the disposable nasopharyngeal airway, and on the other hand, it can also block the tube opening of the nasopharyngeal airway, thereby improving the connection sealing performance between the nasopharyngeal airway and the disposable nasal cannula. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model.

[0024] Figure 2 This is a structural diagram of embodiment 1 of the utility model connected to a nasopharyngeal ventilation tube.

[0025] Figure 3 This is a schematic diagram of Example 1 of the utility model being used after being connected to a nasopharyngeal airway.

[0026] Figure 4 This is a flowchart of Example 1 of the present utility model.

[0027] Figure 5 This is a structural diagram of Example 2 of the present utility model.

[0028] Figure 6 This is a structural diagram of embodiment 2 of the present invention connected to a nasopharyngeal airway. DETAILED DESCRIPTION

[0029] The following is further described in detail through specific implementation methods:

[0030] The reference numerals in the drawings of the specification include: detection tube 1, disposable nasal cannula 2, indicator light 3, air bag 4, trachea 5, sealing plug 6, nasopharyngeal ventilation tube 7.

[0031] Example 1:

[0032] like Figure 1 As shown, a nasal end-tidal carbon dioxide monitoring device for non-intubation general anesthesia includes a detection tube 1 and a disposable nasal cannula 2. The disposable nasal cannula 2 is conical and the large-diameter end is sleeved on the detection tube 1 and frictionally connected to the detection tube 1. In actual use, the disposable nasal cannula 2 can be directly inserted into the patient's nasal cavity for use, or it can be connected to the nasopharyngeal ventilation tube 7 for use (combined with Figure 2 and Figure 3 As shown), after the detection is completed, the disposable nasal cannula 2 is removed and discarded, and the detection tube 1 can be reused. The conical disposable nasal cannula 2 is convenient for docking with the nasopharyngeal ventilation tube 7, and the connection method of the disposable nasal cannula 2 and the nasopharyngeal ventilation tube 7 also adopts friction connection.

[0033] Combine Figure 4As shown, an exhalation sensor is mounted on the inner wall of the detection tube 1. The exhalation sensor is an airflow sensor, which is electrically connected to a controller. The controller is a single-chip microcomputer or a PLC. The controller is electrically connected to an indicator light 3. The controller and the indicator light 3 are mounted on the detection tube 1. The controller is also electrically connected to a first comparator, a second comparator, a timer, and a counter. The exhalation sensor detects the carbon dioxide flow in the human nasal cavity and transmits the generated detection signal to the controller. After receiving the detection signal, the controller controls the first comparator to perform comparison processing. The first comparator outputs a corresponding level signal based on the detection signal. The controller controls the operating state of the indicator light 3 based on the level signal. The operating state of the indicator light 3 includes the following three states:

[0034] In this embodiment, when the end-tidal carbon dioxide partial pressure is greater than 45 mmHg, the first comparator outputs a high-level signal, the controller receives the high-level signal and controls the indicator light 3 to flash yellow;

[0035] When the end-tidal carbon dioxide partial pressure is between 35-45 mmHg, the first comparator outputs a medium-level signal, the controller receives the medium-level signal and controls the indicator light 3 to flash green;

[0036] When the end-tidal carbon dioxide partial pressure is less than 35 mmHg, the first comparator outputs a low-level signal, and the controller receives the low-level signal and controls the indicator light 3 to flash red.

[0037] After receiving the detection signal, the controller controls the timer to perform timing processing and the counter to perform counting processing. After the timing period expires, the controller controls the second comparator to perform comparison processing. In this embodiment, the timing period is one minute. After one minute, the controller receives the number of nasal exhalations detected by the sensor, as recorded by the counter, and controls the second comparator to output a corresponding level signal based on the number of exhalations. In this embodiment, when the number of exhalations is less than 12, the second comparator outputs a low-level signal. The controller receives the low-level signal and controls indicator light 3 to flash red according to the number of exhalations. In this embodiment, the exhalation sensor uses the end-tidal ETCO2 sensor CM2201.

[0038] Example 2:

[0039] The difference between this embodiment and embodiment 1 is that the inner wall of the disposable nasal cannula 2 is provided with an internal thread, the outer wall of the detection tube 1 is provided with an external thread, and the disposable nasal cannula 2 is connected to the detection tube 1 through the internal thread and the external thread.

[0040] Example 3:

[0041] Combine Figure 5 and Figure 6As shown, the difference between this embodiment and embodiment 1 is that an air bag 4 is glued and fixed to the outer wall of the large diameter end of the disposable nasal cannula 2, and the part below the air bag 4 on the disposable nasal cannula 2 is used to connect with the nasopharyngeal ventilation tube 7, and the air bag 4 is connected to the trachea 5. The tube mouth of the trachea 5 is plugged with a sealing plug 6, which is a rubber plug. When not in use, the sealing plug 6 is plugged on the trachea 5.

[0042] With this embodiment, after the disposable nasal cannula 2 is inserted into the patient's nasal cavity, the sealing plug 6 can be removed and an empty needle can be used to pump air into the trachea 5 to inflate the airbag 4. The inflated airbag 4 can be tightly expanded in the patient's nasal cavity, thereby improving the stability of the disposable nasal cannula 2. When the disposable nasal cannula 2 is connected to the nasopharyngeal airway 7, the airbag 4 can also be inflated. The inflated airbag 4 can not only be tightly expanded inside and outside the nasal cavity, but also can block the tube opening of the nasopharyngeal airway 7, thereby improving the sealing performance of the connection between the nasopharyngeal airway 7 and the disposable nasal cannula 2.

[0043] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in 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. A nasal end-tidal carbon dioxide monitoring device for use during non-intubation general anesthesia, characterized by: It includes a detection tube and a disposable nasal cannula. The disposable nasal cannula is detachable and connected to one end of the detection tube. An exhalation sensor is installed on the inner wall of the detection tube. The exhalation sensor is electrically connected to a controller. The controller is electrically connected to an indicator light. The controller and the indicator light are installed on the detection tube. The exhalation sensor is used to detect the carbon dioxide flow in the human nasal cavity and generate a detection signal to transmit to the controller. The controller controls the indicator light to flash once each time it receives a signal from the gas sensor; an air bag is provided on the outer wall of the disposable nasal cannula, the air bag is fixed on the outer wall of the large-diameter end of the disposable nasal cannula, the air bag is connected to the trachea, and a sealing plug is detachably connected to the trachea.

2. The nasal end-tidal carbon dioxide monitoring device for non-intubation general anesthesia according to claim 1, characterized in that: The device further includes a first comparator, which is electrically connected to the controller. The exhalation sensor detects the carbon dioxide flow in the human nasal cavity and transmits the generated detection signal to the controller. After receiving the detection signal, the controller controls the first comparator to perform comparison processing. The first comparator outputs a corresponding level signal according to the detection signal. The controller controls the operating state of the indicator light based on the level signal. The operating state of the indicator light includes the following three states: When the level signal is high, the indicator light flashes yellow; When the level signal is at the middle level, the indicator light flashes green; When the level signal is low, the indicator light flashes red.

3. The nasal end-tidal carbon dioxide monitoring device for non-intubation general anesthesia according to claim 2, characterized in that: It also includes a second comparator, a timer and a counter. The second comparator, timer and counter are all electrically connected to the controller. After receiving the detection signal, the controller controls the timer to perform timing processing and the counter to perform counting processing, and controls the second comparator to perform comparison processing after the timing ends. The second comparator outputs a corresponding level signal according to the counting result, and the controller controls the indicator light to flash red according to the level signal.

4. The nasal end-tidal carbon dioxide monitoring device for non-intubation general anesthesia according to claim 3, characterized in that: An internal thread is provided on the inner wall of the disposable nasal cannula, an external thread is provided on the outer wall of the detection tube, and the disposable nasal cannula is threadedly connected to the detection tube.

5. The nasal end-tidal carbon dioxide monitoring device for non-intubation general anesthesia according to claim 4, characterized in that: The disposable nasal cannula is conical in shape and the large diameter end is connected to the detection tube.

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