Breathing machine for anesthesiology department

Abstract

The invention discloses a breathing machine for the anesthesiology department, and relates to the technical field of breathing machines, the breathing machine comprises a machine body, a connecting pipe is installed on the machine body, a humidifying tank is detachably connected to one side of the machine body, the breathing machine further comprises a retarding mechanism, the retarding mechanism comprises a shell installed between the connecting pipe and the humidifying tank, and an upper disc is fixedly connected to the interior of the shell; an air cylinder is fixedly connected to the bottom of the upper disc, an upper blocking piece is slidably connected into the air cylinder, an elastic pipe is arranged between the holes of the upper disc and the lower disc, when the flow speed of airflow is suddenly increased, the elastic pipe can deform in the radial direction due to the fact that the pressure of the airflow passing through the interior is suddenly increased, and therefore the effect of weakening the flow speed of the airflow is enhanced. The larger the sudden change degree of the airflow velocity is, the larger the radial deformation degree of the elastic tube is, and the larger the obstruction of the airflow flowing is, so that the design can effectively control the smooth output of the airflow of the breathing machine, avoid the bucking of a patient caused by the overlarge stirring degree of the airflow, and improve the use effect of the breathing machine.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilators, in particular to a ventilator for anesthesiology. Background Art

[0002] Anesthesia ventilator is a medical device specially used to provide respiratory support to patients during anesthesia and precisely control the delivery of anesthetic gases. Under general anesthesia or deep sedation anesthesia, the patient's respiratory function is often suppressed. The anesthesia ventilator can replace or assist the patient's breathing, ensure the supply of oxygen and the discharge of carbon dioxide, and maintain the stability of the patient's vital signs. Compared with ordinary ventilators, anesthesia ventilators focus more on cooperating with the anesthetic gas delivery system, and can precisely control the concentration of inhaled anesthetic gases (such as sevoflurane, isoflurane, etc.) to put the patient at an appropriate depth of anesthesia.

[0003] Traditional anesthesia ventilators are mainly composed of a gas source system, a ventilation system and a breathing circuit. The gas source system is used to adjust the oxygen concentration and control the supply of anesthetic gas. The ventilation system is used to deliver gas and adjust the ventilation mode of the ventilator to assist the patient's breathing. The breathing circuit is used to connect the gas output by the ventilator with the patient's body so that the gas can be accurately delivered to the patient's body.

[0004] The ventilation system of the existing anesthesia ventilator realizes gas delivery through an air compressor, and the delivered gas is directly connected to the patient's trachea through a breathing circuit. Therefore, when adjusting the gas delivery speed, it is necessary to adjust the operating speed of the compression mechanism inside the air compressor. For piston and screw compressors, the gas delivery speed mainly depends on the volume change rate and rotation speed of the compression chamber. These compressors are usually designed with a relatively fixed working range, and the adjustment range of their volume change and rotation speed is relatively limited. However, due to the limitation of the mechanical structure, such precise control is often difficult. Therefore, when adjusting the gas delivery speed, the sudden change of the airflow velocity can easily cause patients with respiratory disorders to feel obvious discomfort, and even cause patients to have choking symptoms, aggravating the patient's condition. For this reason, it is necessary to propose a ventilator for anesthesia. Summary of the invention

[0005] The purpose of the present invention is to propose a ventilator for anesthesia in order to solve the problem that when adjusting the gas delivery speed, the sudden change of the air flow rate easily causes the patient with respiratory disorder to feel obvious discomfort or even cause the patient to have choking symptoms.

[0006] In order to achieve the above-mentioned object, the present invention adopts the following technology: a ventilator for anesthesia department: comprising a body, a connecting pipe is installed on the body, a humidification tank is detachably connected to one side of the body, and further comprising:

[0007] A deceleration mechanism, the deceleration mechanism comprises a shell installed between the connecting pipe and the humidification tank, an upper disc is fixedly connected inside the shell, an air cylinder is fixedly connected to the bottom of the upper disc, an upper baffle is slidably connected inside the air cylinder, an outer connecting rod is fixedly connected to the bottom of the upper baffle, a lower disc is fixedly connected to the bottom end of the outer connecting rod, an elastic tube is arranged between the holes of the upper disc and the lower disc, and a torsion assembly is installed on the lower disc;

[0008] A safety assembly, the safety assembly comprising an inner ring fixed to the inner wall of the upper disc, a locking member slidably connected between the inner ring and the upper disc, a pressure plate fixedly connected to the top of the locking member, a spring b arranged between the bottom of the locking member and the inner ring, a closing plate rotatably connected to the inside of the upper disc, an annular member slidably connected to the outside of the locking member, a torsion spring arranged between the annular member and the closing plate;

[0009] When air flows through the shell, the lower disc moves downward to stretch the elastic tube, and at the same time, the elastic tube is twisted by the torsion assembly. When the inside of the shell is in a high pressure state, the locking member moves downward, causing the closing plate to lose its lock and deflect under the elastic force of the torsion spring to close the upper disc.

[0010] As a further description of the above-mentioned technical anesthesia ventilator: two opposite arc-shaped slide grooves are respectively provided on both sides of the inner wall of the shell, and the outer wall of the lower disc is provided with a protrusion a embedded in one of the arc-shaped slide grooves.

[0011] As a further description of the above-mentioned technical anesthesia ventilator: the torsion assembly includes a secondary gear ring and a primary gear ring which are rotatably connected to the lower disc and mesh with each other, the bottom end of the elastic tube is fixed to the secondary gear ring, and the outer wall of the primary gear ring is provided with a protrusion b embedded in another arc-shaped groove.

[0012] As a further description of the above-mentioned technical anesthesia ventilator: a pressure relief valve connected to the interior of the shell is installed on the shell.

[0013] As a further description of the above-mentioned technical anesthesia ventilator: it also includes an auxiliary humidification mechanism, which includes an inner connecting rod passing through an outer connecting rod, and the two ends of the inner connecting rod are respectively fixedly connected with an impeller and an extension rod, and the outside of the extension rod is slidably connected with a sleeve, and a floating strip is fixedly connected to the sleeve.

[0014] As a further description of the above-mentioned technical anesthesia ventilator: the outside of the gas cylinder is equipped with an air inlet pipe connected to the outside, the inside of the air inlet pipe is equipped with a one-way valve a, the outer connecting rod is provided with a connecting hole and is connected to the inside of the inner connecting rod through the connecting hole, and the inside of the extension rod is equipped with a one-way valve b.

[0015] As a further description of the above-mentioned technical anesthesia ventilator: the extension rod is slidably connected to a top pressure block inside, the bottom of the top pressure block is fixedly connected to a pull rod, a spring c is provided at the bottom of the top pressure block, and the humidification tank is provided with a counterweight air bag connected to the extension rod inside.

[0016] As a further description of the above-mentioned technical anesthesia ventilator: a locking ring is fixedly connected to the inner connecting rod, and a bayonet pin is fixedly connected to the inner wall of the locking piece.

[0017] As a further description of the above-mentioned technical anesthesia ventilator: a lower baffle is fixedly connected to the bottom of the lower disc, and a spring a is arranged between the lower disc and the shell.

[0018] In summary, due to the adoption of the above-mentioned technical anesthesia ventilator, the beneficial effects of the present invention are:

[0019] The elastic tube will be gradually stretched as the airflow velocity increases, increasing the resistance of the airflow passing through the elastic tube, thereby achieving the effect of weakening the airflow velocity. When the airflow velocity suddenly increases, the elastic tube will also undergo radial deformation due to the sudden increase in the airflow pressure passing through the elastic tube, thereby further strengthening the effect of weakening the airflow velocity. The greater the degree of sudden change in the airflow velocity, the greater the degree of radial deformation of the elastic tube, and the greater the obstruction to the airflow flow. This design can effectively control the smooth output of the ventilator's airflow, avoid excessive airflow fluctuations that cause the patient to choke and cough, and improve the use effect of the ventilator.

[0020] When the elastic tube is stretched, it will gradually become thinner in order to maintain a relatively constant total volume. The thin elastic tube provides a longer flow path for the gas, so that gas molecules of different components in the gas have more opportunities to collide and diffuse with each other, improve the uniformity of the mixture of oxygen, air and anesthetic gas in the airflow, improve the stability of the anesthetic effect, and enable the operation to proceed smoothly.

[0021] As the airflow velocity increases, the lower disc will deflect when moving and stretching the elastic tube, so that the elastic tube is tilted. The tilted elastic tube can make the airflow in each elastic tube flow out tilted, so that each airflow can be fully mixed after flowing out, further improving the mixing effect of various components in the airflow;

[0022] When the elastic tube is tilted, the secondary gear ring will deflect to twist the elastic tube, increasing the irregularity of the inner wall of the elastic tube, thereby disturbing the airflow and further improving the uniformity of the gas.

[0023] When the flow control valve or other components controlling the gas flow rate in the body fails, the pressure in the shell will increase significantly, causing the pressure plate and the locking member to move downward under pressure, so that the closing plate loses its lock and closes the upper disc under the elastic force of the torsion spring, so that the airflow can no longer pass through the shell, avoiding excessively fast airflow from harming the human body and achieving a safety protection effect;

[0024] The impeller drives the floating strip to move on the liquid surface in the humidification tank with the help of the airflow thrust, thereby increasing the contact area between the sterile water or physiological saline in the humidification tank and the air, accelerating the evaporation rate, and improving the humidification effect. In addition, the rotation of the floating strip will also disturb the airflow inside the humidification tank, so that the evaporated sterile water or physiological saline in the humidification tank is fully mixed with the airflow and flows out with the airflow, thereby improving the humidification effect of the humidification tank. It is worth mentioning that in this process, the floating strip floats on the liquid surface through buoyancy and can change its position with the liquid level to achieve the effect of moving on the liquid surface.

[0025] The downward movement of the lower disc will drive the upper baffle to compress the air inside the cylinder and increase the internal pressure of the cylinder. After the liquid level inside the humidification tank drops, the gas enters the counterweight airbag through the extension rod. The volume of the counterweight airbag increases, causing the liquid level inside the humidification tank to rise. This design can make the evaporated liquid be located at the top of the humidification tank, preventing the evaporated liquid from being too low due to the small amount of remaining liquid in the humidification tank, resulting in the inability to mix with the gas. The counterweight airbag also helps the transfer of heat, which accelerates the evaporation of the liquid when the remaining liquid in the humidification tank becomes less, thereby improving the humidification effect of the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It shows an overall schematic diagram provided according to an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a housing provided according to an embodiment of the present invention is shown;

[0028] Figure 3 A schematic diagram of the interior of a housing provided according to an embodiment of the present invention is shown;

[0029] Figure 4 A schematic diagram of an arc-shaped slide groove provided according to an embodiment of the present invention is shown;

[0030] Figure 5 A schematic diagram of an air intake pipe provided according to an embodiment of the present invention is shown;

[0031] Figure 6 A schematic cross-sectional view of an elastic tube provided in an embodiment of the present invention is shown;

[0032] Figure 7 The embodiment provided according to the present invention shows Figure 6 The enlarged schematic diagram at A in the middle;

[0033] Figure 8 A schematic diagram of a one-way flap a provided in an embodiment of the present invention is shown;

[0034] Fig. 9 The embodiment of the present invention provides Figure 8 The enlarged schematic diagram of point B in the middle;

[0035] Fig.10 A schematic diagram of an extension rod provided according to an embodiment of the present invention is shown;

[0036] Fig.11 A schematic cross-sectional view of an extension rod provided in an embodiment of the present invention is shown;

[0037] Fig.12 The embodiment of the present invention provides Fig.11 Enlarged schematic diagram at point C in the middle.

[0038] Legend:

[0039] 10. Machine body; 11. Connecting pipe; 12. Humidifier tank;

[0040] 20. deceleration mechanism; 21. housing; 22. upper disc; 23. air cylinder; 24. upper baffle; 25. outer connecting rod; 26. lower disc; 27. lower baffle; 28. elastic tube; 29. ​​spring a; 210. convex block a; 211. arc-shaped slide groove; 212. torsion assembly; 2121. secondary gear ring; 2122. primary gear ring; 2123. convex block b;

[0041] 30. Insurance assembly; 31. Inner ring; 32. Locking piece; 33. Pressure plate; 34. Spring b; 35. Closing plate; 36. Torsion spring; 37. Ring piece; 38. Pressure relief valve; 39. Locking ring; 310. Bayonet;

[0042] 40. Auxiliary humidification mechanism; 41. Impeller; 42. Inner connecting rod; 43. Extension rod; 44. Sleeve; 45. Floating strip; 46. Air inlet pipe; 47. One-way valve a; 48. Connecting hole; 49. One-way valve b; 410. Top pressure block; 411. Pull rod; 412. Spring c; 413. Counterweight airbag. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical anesthesia ventilator 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.

[0044] like Figure 1-Figure 12 As shown, the present invention provides: a ventilator for anesthesia department: including a body 10, a connecting pipe 11 is installed on the body 10, a humidification tank 12 is detachably connected to one side of the body 10, the humidification tank 12 is filled with sterile water or physiological saline, the connecting pipe 11 heats the humidification tank 12 to evaporate the internal liquid, thereby humidifying the gas passing through the humidification tank 12 to prevent the gas from being too dry and causing breathing discomfort to the patient; and also includes:

[0045] The deceleration mechanism 20 includes a shell 21 installed between the connecting pipe 11 and the humidification tank 12, the shell 21 is slidably connected to the body 10, and lifting the shell 21 upward can raise the bottom end of the inner connecting rod 42, which is convenient for connecting the inner connecting rod 42 with the extension rod 43. An upper disc 22 is fixedly connected to the inside of the shell 21, and an air cylinder 23 is fixedly connected to the bottom of the upper disc 22. An upper baffle 24 is slidably connected to the inside of the air cylinder 23, and an outer connecting rod 25 is fixedly connected to the bottom of the upper baffle 24. A lower disc 26 is fixedly connected to the bottom end of the outer connecting rod 25. The holes on the upper disc 22 and the lower disc 26 are aligned up and down, an elastic tube 28 is provided between the holes of the upper disc 22 and the lower disc 26, and a torsion assembly 212 is installed on the lower disc 26;

[0046] The safety component 30 includes an inner ring 31 fixed to the inner wall of the upper disc 22, a locking member 32 is slidably connected between the inner ring 31 and the upper disc 22, a pressure plate 33 is fixedly connected to the top of the locking member 32, the pressure plate 33 is used to increase the top area of ​​the locking member 32, so that the thrust of the airflow can more easily press the locking member 32 down, a spring b34 is arranged between the bottom of the locking member 32 and the inner ring 31, the upper disc 22 is internally rotatably connected to a closing plate 35, the holes on the closing plate 35 are aligned with the upper disc 22, the bottom of the locking member 32 is embedded in the closing plate 35, so that the closing plate 35 is locked and cannot rotate, the locking member 32 is externally slidably connected to an annular member 37, a torsion spring 36 is arranged between the annular member 37 and the closing plate 35, the torsion spring 36 is in a tightened state, and the annular member 37 is used to prevent the locking member 32 from moving and causing the torsion spring 36 to deform;

[0047] When the airflow passes through the shell 21, the lower disc 26 moves downward to stretch the elastic tube 28, and at the same time, the elastic tube 28 is twisted by the torsion assembly 212. When the inside of the shell 21 is in a high pressure state, the locking member 32 moves downward, causing the closing plate 35 to lose its lock and deflect under the elastic force of the torsion spring 36 to close the upper disc 22.

[0048] Reference Figure 4Two opposite arc-shaped grooves 211 are respectively provided on both sides of the inner wall of the shell 21, and a protrusion a210 embedded in one of the arc-shaped grooves 211 is provided on the outer wall of the lower disc 26. Under the guidance of the arc-shaped groove 211, the lower disc 26 moves downward and deflects with the protrusion a210, so that the holes of the lower disc 26 and the upper disc 22 are misaligned, and the elastic tube 28 is tilted, so that each airflow can be entangled with each other and fully mixed after flowing out of the elastic tube 28.

[0049] Reference Figure 4 and Figure 5 The torsion assembly 212 includes a secondary gear ring 2121 and a primary gear ring 2122 which are rotatably connected to the lower disc 26 and meshed with each other. The bottom end of the elastic tube 28 is fixed to the secondary gear ring 2121. The outer wall of the primary gear ring 2122 is provided with a protrusion b2123 embedded in another arc-shaped slide groove 211. The downward movement of the lower disc 26 will drive the primary gear ring 2122 to move together, so that the primary gear ring 2122 and the protrusion b2123 are deflected under the guidance of another arc-shaped slide groove 211. The deflection of the primary gear ring 2122 drives the secondary gear ring 2121 to deflect, so that the elastic tube 28 is twisted, increasing the irregularity of the inner wall of the elastic tube 28, thereby interfering with the airflow and making the gas fully mixed.

[0050] Reference Figure 2 A pressure relief valve 38 connected to the interior of the shell 21 is installed on the shell 21. After the upper disc 22 is locked by the closing plate 35, the gas inside the shell 21 cannot flow out, and the air pressure in the shell 21 increases significantly. The gas is released through the elastic tube 28, which helps to reduce the air pressure inside the shell 21 and ensure the safe use of the shell 21. The elastic tube 28 can be connected to external purification equipment to prevent the ejected gas from polluting the external environment.

[0051] Reference Figure 8 and Fig.10 , and also includes an auxiliary humidification mechanism 40, which includes an inner connecting rod 42 that passes through the outer connecting rod 25, and the two ends of the inner connecting rod 42 are respectively fixedly connected with an impeller 41 and an extension rod 43, and the outer side of the extension rod 43 is slidably connected with a sleeve 44, and a floating bar 45 is fixedly connected to the sleeve 44. The floating bar 45 is made of soft material and can be inserted into the humidification tank 12 from the top opening of the humidification tank 12. The floating bar 45 floats on the liquid surface in the humidification tank 12 by buoyancy. The impeller 41 drives the floating bar 45 to rotate with the help of airflow thrust, so that the floating bar 45 paddles on the water surface, expands the water surface area, accelerates the evaporation of the liquid, and the rotation of the floating bar 45 has a mixing effect, so that the gas and steam passing through the humidification tank 12 are fully mixed.

[0052] Reference Figure 2 , Figure 8 , Fig.11 and Fig.12An air inlet pipe 46 connected to the outside is installed on the outside of the air cylinder 23, and a one-way valve a47 is installed inside the air inlet pipe 46. A connecting hole 48 is opened on the outer connecting rod 25 and is connected with the inside of the inner connecting rod 42 through the connecting hole 48. A one-way valve b49 is installed inside the extension rod 43. The one-way valve a47 is used to prevent the gas from being sprayed out of the air cylinder 23 to the outside after the internal pressure of the air cylinder 23 increases, and the one-way valve b49 is used to prevent the gas in the counterweight airbag 413 from flowing back when the upper baffle 24 is reset to reduce the internal air pressure of the air cylinder 23.

[0053] The extension rod 43 is internally slidably connected with a pressing block 410, which contacts the bottom of the one-way flap b49. Under the support of the pressing block 410, the one-way flap b49 is in a non-opening state to prevent the internal pressure of the gas cylinder 23 from opening the one-way flap b49. The bottom of the pressing block 410 is fixedly connected with a pull rod 411, and a spring c412 is provided at the bottom of the pressing block 410. The interior of the humidification tank 12 is provided with a counterweight gas connected to the extension rod 43. Bag 413, after the sleeve 44 descends as the liquid level in the humidification tank 12 decreases, the sleeve 44 presses the pull rod 411 downward to drive the top pressure block 410 to move downward. At this time, the one-way valve b49 is opened by the gas inside the gas cylinder 23, and the gas enters the counterweight airbag 413 through the extension rod 43, filling the counterweight airbag 413, raising the liquid level in the humidification tank 12, and raising the height of the liquid after evaporation, making it easier for the steam to be carried out by the airflow, and the counterweight on the counterweight airbag 413 prevents it from floating.

[0054] Reference Figure 7 A locking ring 39 is fixedly connected to the inner connecting rod 42, and a bayonet pin 310 is fixedly connected to the inner wall of the locking piece 32. When a failure occurs in the machine body 10 and the air flow velocity increases sharply, the descent of the locking piece 32 will also drive the bayonet pin 310 to descend and lock the locking ring 39, so that the locking ring 39 and the impeller 41 stop rotating, thereby preventing the floating bar 45 from rotating rapidly and causing the liquid in the humidification tank 12 to splash into the trachea connected thereto.

[0055] Reference Figure 5 and Figure 6 A lower baffle 27 is fixedly connected to the bottom of the lower disc 26 to block the airflow, further slow down the airflow speed, and make it easier for the airflow to drive the lower disc 26 to move downward. A spring a29 is arranged between the lower disc 26 and the shell 21 to keep the lower disc 26 stable.

[0056] Working principle: connect the air outlet of the humidifier tank 12 to the patient's airway through the breathing circuit, start the body 10 to transport oxygen, air and anesthetic gas to the housing 21 through the connecting pipe 11;

[0057] After the airflow enters the housing 21, it drives the impeller 41 to rotate and pushes the upper baffle 24 downward. The upper baffle 24 moves downward, driving the outer connecting rod 25 and the lower disc 26 to move downward, so that the elastic tube 28 is stretched, and under the guidance of the arc-shaped slide groove 211, the lower disc 26 moves downward and deflects together with the protrusion a210, thereby driving the elastic tube 28 to tilt. The guidance of another arc-shaped slide groove 211 causes the primary gear ring 2122 and the protrusion b2123 to deflect in the opposite direction, thereby driving the secondary gear ring 2121 to deflect and twist the elastic tube 28.

[0058] The airflow passes through the holes of the upper disc 22 and enters the elastic tube 28, and then passes through the holes of the lower disc 26 and enters the humidification tank 12. The body 10 heats the humidification tank 12, so that the liquid inside evaporates and mixes with the gas entering the humidification tank 12, and the gas is discharged from the gas outlet of the humidification tank 12 after the humidity of the gas increases.

[0059] The impeller 41 rotates to drive the inner connecting rod 42, the extension rod 43, the sleeve 44 and the floating bar 45 to rotate. The floating bar 45 floats on the liquid surface in the humidification tank 12 by buoyancy. The floating bar 45 rotates to move the liquid in the humidification tank 12, promotes the evaporation of the liquid and fully mixes the steam with the gas passing through the humidification tank 12.

[0060] After the liquid level in the humidification tank 12 drops, the sleeve 44 drops to press the pull rod 411 downward, so that the top pressure block 410 moves downward, and the air squeezed by the upper baffle 24 in the air cylinder 23 enters the inner connecting rod 42 through the connecting hole 48, and then enters the extension rod 43 to open the one-way flap b49, and enters the weighted airbag 413 through the extension rod 43, so that the weighted airbag 413 is filled, and the liquid level of the liquid inside the humidification tank 12 is raised;

[0061] When the output gas flow rate increases due to a failure of an internal part of the machine body 10, the internal air pressure of the shell 21 increases significantly, pressing the pressing plate 33 and the locking member 32 downward, and the closing plate 35 loses the locking of the locking member 32 and deflects under the elastic force of the torsion spring 36, closing the hole of the upper disc 22. After the air pressure in the shell 21 increases, the elastic tube 28 opens under pressure to release the pressure.

[0062] The downward movement of the locking member 32 simultaneously drives the bayonet 310 to press down and lock the locking ring 39, the inner connecting rod 42 and the impeller 41, so that the floating bar 45 no longer rotates, thereby preventing the floating bar 45 from rotating too fast and causing the liquid inside the humidification tank 12 to enter the trachea.

[0063] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes to the anesthesia ventilator and its inventive concept according to the technical scope disclosed by the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A ventilator for anesthesia, comprising a body (10), a connecting pipe (11) being installed on the body (10), a humidification tank (12) being detachably connected to one side of the body (10), characterized in that: Also includes: A deceleration mechanism (20), the deceleration mechanism (20) comprising a shell (21) installed between the connecting pipe (11) and the humidification tank (12), the shell (21) having an upper disc (22) fixedly connected inside, the bottom of the upper disc (22) having an air cylinder (23) fixedly connected, the inside of the air cylinder (23) having an upper baffle (24) slidably connected, the bottom of the upper baffle (24) having an external connecting rod (25) fixedly connected, the bottom end of the external connecting rod (25) having a lower disc (26) fixedly connected, an elastic tube (28) being arranged between holes of the upper disc (22) and the lower disc (26), and a torsion assembly (212) being installed on the lower disc (26); A safety assembly (30), the safety assembly (30) comprising an inner ring (31) fixed to the inner wall of the upper disc (22), a locking member (32) being slidably connected between the inner ring (31) and the upper disc (22), a pressure plate (33) being fixedly connected to the top of the locking member (32), a spring b (34) being arranged between the bottom of the locking member (32) and the inner ring (31), a closing plate (35) being rotatably connected to the inside of the upper disc (22), an annular member (37) being slidably connected to the outside of the locking member (32), and a torsion spring (36) being arranged between the annular member (37) and the closing plate (35); When air flows through the shell (21), the lower disc (26) moves downward to stretch the elastic tube (28), and at the same time, the elastic tube (28) is twisted by the twisting assembly (212). When the inside of the shell (21) is in a high pressure state, the locking member (32) moves downward, causing the closing plate (35) to lose its lock and deflect under the elastic force of the torsion spring (36) to close the upper disc (22).

2. The anesthesia ventilator according to claim 1, characterized in that: Two opposite arc-shaped sliding grooves (211) are respectively provided on both sides of the inner wall of the shell (21), and a protrusion a (210) embedded in one of the arc-shaped sliding grooves (211) is provided on the outer wall of the lower disc (26).

3. The anesthesia ventilator according to claim 2, characterized in that: The torsion assembly (212) comprises a secondary gear ring (2121) and a primary gear ring (2122) which are rotatably connected to the lower disc (26) and mesh with each other, the bottom end of the elastic tube (28) is fixed to the secondary gear ring (2121), and the outer wall of the primary gear ring (2122) is provided with a protrusion b (2123) embedded in another arc-shaped sliding groove (211).

4. The anesthesia ventilator according to claim 1, characterized in that: The housing (21) is provided with a pressure relief valve (38) which is in communication with the interior thereof.

5. The anesthesia ventilator according to claim 1, characterized in that: The invention also comprises an auxiliary humidifying mechanism (40), wherein the auxiliary humidifying mechanism (40) comprises an inner connecting rod (42) penetrating the outer connecting rod (25), the two ends of the inner connecting rod (42) being fixedly connected to an impeller (41) and an extension rod (43), respectively, the outside of the extension rod (43) being slidably connected to a sleeve (44), and the sleeve (44) being fixedly connected to a floating strip (45).

6. The anesthesia ventilator according to claim 5, characterized in that: An air intake pipe (46) communicating with the outside is installed on the outside of the air cylinder (23), a one-way valve a (47) is installed inside the air intake pipe (46), a connecting hole (48) is opened on the outer connecting rod (25) and is connected with the inside of the inner connecting rod (42) through the connecting hole (48), and a one-way valve b (49) is installed inside the extension rod (43).

7. The anesthesia ventilator according to claim 6, characterized in that: The extension rod (43) is internally slidably connected to a push block (410), the bottom of the push block (410) is fixedly connected to a pull rod (411), the bottom of the push block (410) is provided with a spring c (412), and the interior of the humidification tank (12) is provided with a counterweight air bag (413) connected to the extension rod (43).

8. The anesthesia ventilator according to claim 5, characterized in that: A locking ring (39) is fixedly connected to the inner connecting rod (42), and a bayonet (310) is fixedly connected to the inner wall of the locking member (32).

9. The anesthesia ventilator according to claim 1, characterized in that: A lower baffle (27) is fixedly connected to the bottom of the lower disc (26), and a spring a (29) is provided between the lower disc (26) and the housing (21).

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