Medical anesthesia machine capable of preventing anesthetic from flowing back

Abstract

The invention relates to the technical field of medical instruments, in particular to a medical anaesthesia machine capable of preventing anesthetic backflow, the medical anaesthesia machine comprises a main body mechanism, a medicine filling mechanism and a mask mechanism, the main body mechanism comprises a columnar shell and a supporting frame, an anti-skid column is fixedly mounted at the top of the columnar shell, an anesthetic treatment medicine tube is mounted on the anti-skid column, and the anesthetic treatment medicine tube is fixedly mounted on the supporting frame; an anesthetic evaporator is fixedly connected to the inner wall of the anesthetic treatment tube, and a sealing plug is embedded between the anesthetic treatment tube and the anesthetic evaporator in a sliding mode. In the atomization anesthesia process, work of all components of the device can be coordinated through an automatic control system according to the inspiration and expiration states of a patient, and therefore the atomization anesthesia effect is improved. Atomized anesthetic gas is pushed to be conveyed to the mask for a patient to inhale during inspiration, conveying is stopped in time and a corresponding channel is closed during expiration, anesthetic conveying and breathing of the patient are synchronous, the anesthetic effect is guaranteed, and the anesthetic backflow possibility caused by reverse pressure difference is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a medical anesthesia machine capable of preventing anesthetic from flowing back. Background Art

[0002] In modern medical surgery, when existing equipment is used, the medical anesthesia machine plays a vital role. It can accurately deliver anesthetics to the patient, allowing the patient to enter a suitable anesthesia state to ensure the smooth progress of the operation.

[0003] In the current medical field, medical anesthesia machines have the phenomenon of anesthetic reflux. From the perspective of the impact on the anesthesia effect, anesthetic reflux interferes with the original accurate delivery dose of the anesthetic, and the accuracy of the dose is difficult to guarantee, which can easily cause the patient to fall into a dangerous situation of too light anesthesia or too deep anesthesia, posing a great risk to surgical safety and postoperative recovery. Secondly, anesthetic reflux will also have an adverse effect on the anesthesia machine itself. The refluxed anesthetic is often corrosive or carries impurities exhaled by the patient, which will come into contact with pipes and components, causing corrosion of these components, reducing their performance, and even contaminating them, affecting their normal functions and shortening the service life of the anesthesia machine. Summary of the invention

[0004] The object of the present invention is to provide a medical anesthesia machine capable of preventing anesthetic reflux, so as to solve the problems raised in the above-mentioned background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A medical anesthesia machine capable of preventing anesthetic reflux comprises: a main body mechanism, a medicine filling mechanism and a mask mechanism, wherein the main body mechanism comprises a columnar shell, a non-slip column is fixedly mounted on the top of the columnar shell, an anesthetic treatment medicine tube is mounted on the non-slip column, an anesthetic evaporator is fixedly connected to the inner wall of the anesthetic treatment medicine tube, a sealing plug is slidably embedded between the anesthetic treatment medicine tube and the anesthetic evaporator, and the sealing plug can move horizontally to push atomized gas to the mask mechanism; The medicine filling mechanism is installed on one side of the outer wall of the main body mechanism and is used to transfer the medicine liquid to the inside of the main body mechanism; The mask mechanism is connected to the main body mechanism and is used to assist the patient's anesthesia and breathing.

[0006] Preferably, the interior of the cylindrical shell is fixedly connected to an internal drive motor, an inner seat is fixedly installed inside the cylindrical shell, a bearing is provided inside the inner seat, a threaded rod is provided on the inner wall of the bearing, one end of the threaded rod away from the bearing is fixedly connected to the output end of the internal drive motor, and the support frame is installed at the bottom of the cylindrical shell.

[0007] Preferably, the outer surface of the threaded rod is threadedly connected with a linkage plate, a snap-fit ​​seat is fixedly installed on the top of the linkage plate, the snap-fit ​​seat and the columnar shell are slidably connected, and the top of the snap-fit ​​seat extends to the outside of the columnar shell, and a locking assembly is fixedly installed on the top of the columnar shell.

[0008] Preferably, a limiting rod is fixedly connected to the interior of the columnar housing, and the linkage plate is slidably embedded in the limiting rod.

[0009] Preferably, an injection valve is fixedly mounted on one side of the outer wall of the anesthetic treatment tube, an extension rod is fixedly connected to one side of the outer wall of the sealing plug, and one end of the extension rod away from the sealing plug is engaged with the engagement seat.

[0010] Preferably, the drug filling mechanism comprises a mounting plate, the inner surface of the mounting plate is fixedly connected with a drug tube, and the outer surface of the drug tube is fixedly mounted with a plurality of electric infusion pumps.

[0011] Preferably, the input ends of the plurality of electric infusion pumps are all threadedly connected to medicine bottles, the input end of the medicine tube is fixedly mounted with a diaphragm pump, and the top of the diaphragm pump is provided with two circulation ports.

[0012] Preferably, the output end of the drug tube is fixedly connected to a hose A, a peristaltic pump is fixedly installed on the output end of the hose A, a hose B is fixedly installed on the output end of the peristaltic pump, an injection valve is fixedly installed on one side of the outer wall of the anesthetic treatment drug tube, and the output end of the hose B is fixedly connected to the input end of the injection valve.

[0013] Preferably, the mask mechanism includes a mask body, the inner surface of which is provided with two thermal flow sensors, an air valve is fixedly installed at the input end of the mask body, a hose C is fixedly installed at the input end of the air valve, a connector is fixedly installed at the output end of the anesthetic treatment tube, and the output end of the hose C is fixedly installed with the output end of the connector.

[0014] Preferably, a multi-channel solenoid valve is fixedly installed on the output end of the mask body, and a filter plate is fixedly installed on the output end of the multi-channel solenoid valve.

[0015] Beneficial effects of the present invention: 1. During the atomization anesthesia process, the present invention can coordinate the operation of various components of the device through an automated control system according to the patient's inhalation and exhalation states, push the atomized anesthetic gas to the mask for the patient to inhale during inhalation, stop the delivery in time and close the corresponding passage during exhalation, so that the anesthetic delivery is synchronized with the patient's breathing, which not only ensures the anesthetic effect, but also greatly reduces the possibility of anesthetic reflux caused by reverse pressure difference, thereby improving the safety and effectiveness of the anesthesia process.

[0016] 2. During use, the present invention can effectively control the amount of different liquid medicines input according to the body shapes of different patients, which helps to ensure that the various components of the anesthetic are mixed in an accurate proportion, ensure the stability and safety of the anesthetic effect, and avoid problems such as too deep or too shallow anesthesia caused by inaccurate dosage.

[0017] 3. The present invention forms a complete system from the preparation of the drug solution to the completion of the anesthetic, which improves the stability of each link of the anesthesia operation as a whole, ensures the safety of the patient, and also helps to improve the success rate of anesthesia and the anesthesia experience of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a main structural stereogram of the present invention; Figure 3 It is a cutaway stereoscopic diagram of the main mechanism of the present invention; Figure 4 It is a three-dimensional exploded view of the main mechanism of the present invention; Figure 5 A three-dimensional diagram of the drug filling mechanism; Figure 6 For the present invention Figure 5 A magnified view of the structure at A in FIG. Figure 7 is a three-dimensional diagram of the mask mechanism of the present invention; Figure 8 It is a plan view of the mask body in the present invention.

[0019] The reference numerals in the figures are as follows: 1. Main body; 11. Columnar shell; 111. Support frame; 112. Anti-skid column; 12. Internal drive motor; 13. Inner seat; 131. Bearing; 132. Threaded rod; 14. Limit rod; 15. Linkage plate; 151. Snap-fit ​​seat; 16. Locking assembly; 17. Anesthetic agent handling tube; 171. Connector; 172. Anesthetic agent vaporizer; 173. Injection valve; 18. Sealing plug; 181. Extension rod; 2. Drug filling mechanism; 21. Mounting plate; 211. Drug tube; 22. Electric infusion pump; 221. Medicine bottle; 23. Diaphragm pump; 231. Circulation port; 24. Hose A; 25. Peristaltic pump; 26. Hose B; 3. Mask mechanism; 31. Mask body; 311. Thermal flow sensor; 32. Air valve; 321. Hose C; 33. Multi-channel solenoid valve; 331. Filter plate. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1-Figure 8 As shown, a medical anesthesia machine capable of preventing anesthetic reflux comprises: a main body mechanism 1, a drug filling mechanism 2 and a mask mechanism 3. The main body mechanism 1 comprises a columnar shell 11 and a support frame 111. The columnar shell 11 is fixed to the top of the support frame 111, and the support frame 111 supports the columnar shell 11. An anti-skid column 112 is fixedly installed on the top of the columnar shell 11, and an anesthetic treatment medicine tube 17 is installed on the anti-skid column 112. An anesthetic evaporator 172 is fixedly connected to the inner wall of the anesthetic treatment medicine tube 17. A sealing plug 18 is slidably embedded between the anesthetic treatment medicine tube 17 and the anesthetic evaporator 172. The sealing plug 18 can move horizontally to push the atomized gas to the mask mechanism 3. like Figure 4 As shown, the anesthetic evaporator 172 is fixedly connected to the inside of the anesthetic treatment tube 17, dividing the inside of the anesthetic treatment tube 17 into two sealed spaces, an upper space and a lower space. Pressure regulating valves are provided outside the two sealed spaces. With the help of the pressure regulating valves, it is possible to ensure that the inside of the two sealed spaces is always maintained at a specific air pressure value. When the mixed liquid medicine enters the sealed space below, the anesthetic evaporator 172 located at the top will start to evaporate the liquid medicine in the lower space, and through its own specific output port and in communication with the upper space, the generated anesthetic gas can be transferred to the upper space.

[0022] The drug filling mechanism 2 is installed on one side of the outer wall of the main body mechanism 1, and is used to mix different drug liquid components and transfer them to the inside of the main body mechanism 1, and then atomize the drug liquid, and push the atomized gas under the precise driving of the equipment; The mask mechanism 3 is connected to the main body mechanism 1, and under self-detection, the detection signal is summarized and analyzed to analyze the gas flow direction, determine whether the patient is inhaling or exhaling, and output different instructions according to inhalation or exhalation.

[0023] like Figure 1-Figure 3 As shown, the interior of the cylindrical shell 11 is fixedly connected to the internal drive motor 12, and the interior of the cylindrical shell 11 is fixedly installed with an inner seat 13, the interior of the inner seat 13 is provided with a bearing 131, the inner wall of the bearing 131 is provided with a threaded rod 132, the inner surface of the inner seat 13 and the outer ring of the bearing 131 are fixed, and the threaded rod 132 and the inner ring of the bearing 131 are fixed, so that one end of the threaded rod 132 can be rotatably connected to the inner seat 13 through the bearing 131, and the end of the threaded rod 132 away from the bearing 131 is fixedly connected to the output end of the internal drive motor 12, and the support frame (111) is installed at the bottom of the cylindrical shell (11).

[0024] like Figure 1-Figure 3 As shown, the outer surface of the threaded rod 132 is threadedly connected with a linkage plate 15, and a snap-fit ​​seat 151 is fixedly installed on the top of the linkage plate 15. The snap-fit ​​seat 151 and the columnar shell 11 are slidably connected. A sliding groove for the movement of the snap-fit ​​seat 151 is provided on the top of the columnar shell 11, and the top of the snap-fit ​​seat 151 extends to the outside of the columnar shell 11, and a locking assembly 16 is fixedly installed on the top of the columnar shell 11.

[0025] like Figure 3 As shown, the interior of the columnar shell 11 is fixedly connected to a limit rod 14, and a linkage plate 15 is slidably embedded on the limit rod 14. An arc groove is provided at the bottom of the linkage plate 15, and the arc groove fits on the outer surface of the limit rod 14, so that the limit rod 14 can provide guidance for the linkage plate 15, so that the linkage plate 15 can only move horizontally in the direction of the limit rod 14.

[0026] like Figure 3-Figure 4 As shown, an injection valve 173 is fixedly installed on one side of the outer wall of the anesthetic treatment tube 17, and an extension rod 181 is fixedly connected to one side of the outer wall of the sealing plug 18. The end of the extension rod 181 away from the sealing plug 18 is engaged with the engaging seat 151. The extension rod 181 and the engaging seat 151 are connected by a snap connection, so that when the engaging seat 151 moves horizontally, it can drive the extension rod 181 to move together.

[0027] like Figure 2 and Figure 5As shown, the drug filling mechanism 2 includes a mounting plate 21, which is fixedly connected to the columnar housing 11, a drug tube 211 is fixedly connected to the inner surface of the mounting plate 21, and a plurality of electric infusion pumps 22 are fixedly installed on the outer surface of the drug tube 211.

[0028] like Figure 2 as well as Figure 5-Figure 6 As shown, the input ends of the multiple electric infusion pumps 22 are all threadedly connected to the medicine bottles 221, and the input port of the input end of the electric infusion pump 22 is provided with an internal thread, which can realize the threaded connection with the medicine bottle 221. Each electric infusion pump 22 can be independently controlled, and the input amount of the medicine solution in each medicine bottle 221 can be adjusted according to the anesthesia needs of different patients. The input end of the drug tube 211 is fixedly installed with a diaphragm pump 23, and the top of the diaphragm pump 23 is provided with two circulation ports 231.

[0029] like Figure 2 and Figure 5 As shown, the output end of the drug tube 211 is fixedly connected to a hose A24, and a peristaltic pump 25 is fixedly installed at the output end of the hose A24. During the drug liquid delivery, if the air pressure increases due to the drug liquid delivery, the peristaltic pump 25 can automatically discharge a proper amount of gas to ensure that the air pressure is maintained within a normal range; if the air pressure decreases, the gas can be supplemented through the corresponding air inlet channel, thereby effectively balancing the pressure difference in the sealing device; like Figure 4 as well as Figure 5 As shown, a hose B26 is fixedly installed at the output end of the peristaltic pump 25, an injection valve 173 is fixedly installed on one side of the outer wall of the anesthetic treatment tube 17, and the output end of the hose B26 is fixedly connected to the input end of the injection valve 173, so that the drug solution can be input into the interior of the anesthetic treatment tube 17 through the hose B26 and the injection valve 173.

[0030] like Figure 2 , Figure 4 , Figure 7-Figure 8As shown, the mask mechanism 3 includes a mask body 31, and two thermal flow sensors 311 are arranged on the inner surface of the mask body 31. The thermal flow sensor 311 is arranged at the front end of the patient's mouth and nose. When the patient inhales, the gas flows toward the respiratory tract. In this process, the heat generated by the heating element is taken away, so that the temperature sensitive element detects the corresponding temperature change. The sensor can accurately determine that the gas is flowing toward the patient's body at this time based on the relationship between heat transfer and gas flow, combined with pre-calibration and built-in algorithm models, and can further calculate the flow size of the inhalation. Similarly, when the patient exhales, the exhaled gas is in a reverse flow state, and its effect on the heat of the heating element is completely different from that when inhaling. Based on this, it can be judged as an exhalation state, and the exhalation flow data can also be obtained. In this process, the detected signal is first amplified and filtered, and then needs to be converted into a digital signal, and then further calculated and analyzed by a digital processing unit (such as a microcontroller). The microcontroller will generate corresponding automatic control instructions based on the inhalation and exhalation state and flow results obtained by the analysis to control the internal drive motor 12.

[0031] An air valve 32 is fixedly installed at the input end of the mask body 31, a hose C321 is fixedly installed at the input end of the air valve 32, a connector 171 is fixedly installed at the output end of the anesthetic treatment tube 17, and the output end of the hose C321 and the output end of the connector 171 are fixedly installed, so that the atomized liquid in the anesthetic treatment tube 17 can be input into the interior of the mask body 31 through the connector 171 and the hose C321.

[0032] like Figure 2 , Figure 7-Figure 8 As shown, a multi-channel solenoid valve 33 is fixedly installed at the output end of the mask body 31 , and a filter plate 331 is fixedly installed at the output end of the multi-channel solenoid valve 33 .

[0033] Working principle: A plurality of medicine bottles 221 containing different components of liquid medicine are connected to the inside of the electric infusion pump 22 by means of threaded connection, and then, with the help of the adsorption effect of the plurality of electric infusion pumps 22, liquid medicine can be sucked from the corresponding liquid medicine bottles and the amount can be controlled, and the liquid medicine is delivered to the inside of the medicine tube 211. Subsequently, the peristaltic pump 25 starts to work, and the hose A24, the hose B26 and the injection valve 173 are used as the delivery medium to deliver the liquid medicine by peristalsis; The liquid medicine in the drug tube 211 will be smoothly transferred to the interior of the anesthetic treatment drug tube 17, and in this transfer process, different liquid medicines can be fully mixed, and the degree of mixing is further improved. The liquid medicine will be input into the space below the anesthetic evaporator 172 in the anesthetic treatment drug tube 17 through the injection valve 173. When the mixed liquid medicine enters the sealed space below, the anesthetic evaporator 172 at the top will start to operate, evaporate the liquid medicine in the space below, and then transfer the generated anesthetic gas to the space above the anesthetic evaporator 172 in the anesthetic treatment drug tube 17 through its own specific output port. At the same time, the mask mechanism 3 is worn on the patient's face. When atomization anesthesia is performed, the thermal flow sensor 311 detects whether the patient is in an exhalation or inhalation state, and finally generates corresponding automatic control instructions. Relying on the automatic control system for operation, the internal drive motor 12 will start and stop continuously according to the corresponding instructions. When the internal drive motor 12 is in the power-on state, its output end starts to run and drives the threaded rod 132 to rotate inside the two bearings 131. When the threaded rod 132 rotates, it will generate threaded transmission with the inside of the linkage plate 15, and the linkage plate 15 is limited at the limit position. The outer wall of the rod 14 is moved between the outer wall of the rod 14, thereby driving the linkage plate 15 and the engaging seat 151 fixed to the top thereof to move horizontally. Since the extension rod 181 is engaged in the inside of the engaging seat 151, when the linkage plate 15 moves, it will push the extension rod 181 to move horizontally, and then use the extension rod 181 as a medium to push the sealing plug 18 to move between the anesthetic treatment tube 17 and the anesthetic vaporizer 172, so as to push the atomized anesthetic gas to be pushed and processed, so that it is transmitted to the inside of the mask body 31 through the hose C321, and then inhaled into the body by the patient; On the contrary, when the patient is in the exhalation state, the internal drive motor 12 stops running, and the corresponding control command is transmitted to the inside of the air valve 32, so that the air valve 32 remains in a closed state, thereby disconnecting the connection between the mask body 31 and the hose C321. At the same time, the automatic control command starts the multi-channel solenoid valve 33 again, connecting the mask mechanism 3 with the external environmental gas, so that the patient's exhaled gas is discharged to the environment, and the filter plate 331 filters it to prevent external dust from entering the equipment during the entire anesthetic gas delivery process; When the patient inhales, the anesthetic gas enters the respiratory tract along the direction of the natural inhalation airflow. The air pressure distribution of the breathing circuit is conducive to the forward flow of the gas and is not easy to produce a reverse pressure difference, thereby reducing the possibility of anesthetic reflux. When the patient exhales, the closed anesthesia pathway can effectively prevent the expiratory airflow from impacting the delivery pipeline in reverse, maintain the air pressure in the pipeline stable, and promote the orderly flow of gas according to the normal rule of entering during inhalation and pausing delivery during exhalation, thereby reducing the hidden danger of anesthetic reflux caused by abnormal pressure difference.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A medical anesthesia machine capable of preventing anesthetic reflux, comprising: A main body mechanism (1), a drug filling mechanism (2) and a mask mechanism (3), characterized in that: the main body mechanism (1) comprises a columnar shell (11) and a support frame (111), a non-slip column (112) is fixedly mounted on the top of the columnar shell (11), an anesthetic agent processing tube (17) is mounted on the non-slip column (112), an anesthetic agent evaporator (172) is fixedly connected to the inner wall of the anesthetic agent processing tube (17), a sealing plug (18) is slidably embedded between the anesthetic agent processing tube (17) and the anesthetic agent evaporator (172), and the sealing plug (18) can move horizontally to push the atomized gas to the mask mechanism (3); The drug filling mechanism (2) is installed on one side of the outer wall of the main body mechanism (1) and is used to transfer the drug solution into the interior of the main body mechanism (1); The mask mechanism (3) is connected to the main body mechanism (1) and is used to assist the patient's anesthesia and breathing.

2. A medical anesthesia machine capable of preventing anesthetic backflow according to claim 1, characterized in that: An internal drive motor (12) is fixedly connected to the interior of the columnar housing (11), an inner seat (13) is fixedly installed inside the columnar housing (11), a bearing (131) is provided inside the inner seat (13), a threaded rod (132) is provided on the inner wall of the bearing (131), an end of the threaded rod (132) away from the bearing (131) is fixedly connected to the output end of the internal drive motor (12), and a support frame (111) is installed at the bottom of the columnar housing (11).

3. A medical anesthesia machine capable of preventing anesthetic backflow according to claim 2, characterized in that: The outer surface of the threaded rod (132) is threadedly connected to a linkage plate (15); a snap-fit ​​seat (151) is fixedly mounted on the top of the linkage plate (15); the snap-fit ​​seat (151) and the columnar housing (11) are slidably connected, and the top of the snap-fit ​​seat (151) extends to the outside of the columnar housing (11); and a locking assembly (16) is fixedly mounted on the top of the columnar housing (11).

4. A medical anesthesia machine capable of preventing anesthetic backflow according to claim 3, characterized in that: The interior of the columnar housing (11) is fixedly connected to a limit rod (14), and the linkage plate (15) is slidably embedded in the limit rod (14).

5. The medical anesthesia machine capable of preventing anesthetic backflow according to claim 3, characterized in that: An injection valve (173) is fixedly mounted on one side of the outer wall of the anesthetic treatment tube (17), an extension rod (181) is fixedly connected to one side of the outer wall of the sealing plug (18), and one end of the extension rod (181) away from the sealing plug (18) is engaged with the engagement seat (151).

6. A medical anesthesia machine capable of preventing anesthetic backflow according to claim 5, characterized in that: The drug filling mechanism (2) comprises a mounting plate (21), the inner surface of the mounting plate (21) being fixedly connected to a drug tube (211), and the outer surface of the drug tube (211) being fixedly mounted with a plurality of electric infusion pumps (22).

7. A medical anesthesia machine capable of preventing anesthetic backflow according to claim 6, characterized in that: The input ends of the plurality of electric infusion pumps (22) are all threadedly connected to medicine bottles (221), the input end of the medicine tube (211) is fixedly mounted with a diaphragm pump (23), and the top of the diaphragm pump (23) is provided with two circulation ports (231).

8. A medical anesthesia machine capable of preventing anesthetic backflow according to claim 7, characterized in that: The output end of the drug tube (211) is fixedly connected to a hose A (24), a peristaltic pump (25) is fixedly installed on the output end of the hose A (24), a hose B (26) is fixedly installed on the output end of the peristaltic pump (25), an injection valve (173) is fixedly installed on one side of the outer wall of the anesthetic treatment drug tube (17), and the output end of the hose B (26) is fixedly connected to the input end of the injection valve (173).

9. The medical anesthesia machine capable of preventing anesthetic backflow according to claim 1, characterized in that: The mask mechanism (3) comprises a mask body (31), the inner surface of the mask body (31) being provided with two thermal flow sensors (311), an air valve (32) being fixedly mounted on the input end of the mask body (31), a hose C (321) being fixedly mounted on the input end of the air valve (32), a connector (171) being fixedly mounted on the output end of the anesthetic treatment tube (17), and the output end of the hose C (321) being fixedly mounted on the output end of the connector (171).

10. The medical anesthesia machine capable of preventing anesthetic backflow according to claim 9, characterized in that: A multi-channel solenoid valve (33) is fixedly mounted on the output end of the mask body (31), and a filter plate (331) is fixedly mounted on the output end of the multi-channel solenoid valve (33).

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