Medical ventilation device and ventilator

Abstract

The application belongs to the technical field of medical devices, and particularly relates to a medical ventilation device and a breathing machine. The medical ventilation device comprises an on-off valve, a lever assembly and a base. The base is provided with an air inlet, an air outlet, a first accommodating hole, a second accommodating hole, a first air channel, a second air channel and a third air channel. The on-off valve is installed in the first accommodating hole and is used for controlling the on-off between the air inlet and the first accommodating hole. The lever assembly comprises a first elastic member, a rotating shaft and a lever provided with a first plug and a second plug. The lever is rotatably installed in the second accommodating hole through the rotating shaft. The first plug is used for plugging or conducting the first air channel. The second plug is used for plugging or conducting the second air channel. The first elastic member is in abutment with an end of the lever away from the first plug. In the application, the gas flowing into the first air channel can compensate the pressure loss of the gas, so that the gas flowing out of the air outlet has sufficient pressure and flow rate, and the pressure loss of the gas flowing out of the air outlet is avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, in particular to a medical ventilation device and a breathing machine. BACKGROUND

[0002] The breathing machine is a medical device that can replace, control or change the normal physiological breathing of a person, increase the lung ventilation volume, improve the respiratory function, reduce the respiratory work consumption and save the heart reserve capacity. The breathing machine mainly mixes high-pressure oxygen and high-pressure air and then outputs the mixture to the patient end, so that the patient can inhale the air-oxygen mixture with appropriate concentration and pressure through the breathing machine.

[0003] The ventilation valve is an important component of the breathing machine. When the pressure at the air inlet is greater than the preset pressure, the high-pressure gas drives the ventilation valve to open, so that the pressure at the air inlet can be output from the air outlet through the ventilation valve. When the pressure of the gas at the air inlet is less than the preset pressure, the ventilation valve is in a closed state, so that the low-pressure gas cannot be output from the air outlet through the ventilation valve, so that the ventilation valve can control the outlet pressure of the air outlet.

[0004] When the gas drives the ventilation valve to be conducted, the pressure of the gas will decrease, and the corresponding pressure and flow of the gas output from the air outlet will also decrease, so that the existing ventilation valve will cause the loss of gas pressure. SUMMARY

[0005] In view of the technical problem that the existing ventilation valve will cause the loss of gas pressure, the present application provides a medical ventilation device and a breathing machine.

[0006] In view of the above technical problems, the present application provides a medical ventilation device, which comprises an on-off valve, a lever assembly and a base.

[0007] The base is provided with an air inlet, an air outlet, a first accommodating hole, a second accommodating hole, a first gas channel, a second gas channel and a third gas channel. The air inlet and the air outlet are both communicated with the first accommodating hole. The opposite ends of the first gas channel are respectively communicated with the air inlet and the second accommodating hole. The opposite ends of the second gas channel and the third gas channel are respectively communicated with the first accommodating hole and the second accommodating hole.

[0008] The on-off valve is installed in the first accommodating hole and is used to control the on-off between the air inlet and the first accommodating hole.

[0009] The lever assembly comprises a first elastic member, a rotating shaft, and a lever provided with a first plug and a second plug, the lever is rotatably installed in the second accommodating hole through the rotating shaft, the first plug is used for plugging or conducting one end of the first gas channel away from the air inlet, the second plug is used for plugging or conducting one end of the second gas channel away from the first accommodating hole, and the first elastic member is in abutment with one end of the lever away from the first plug.

[0010] When the gas pressure of the air inlet is greater than the preset pressure, part of the gas in the air inlet flows into the first accommodating hole and the second gas channel through the on-off valve, the gas in the second gas channel drives the lever to rotate so that the first gas channel and the second gas channel are both communicated with the second accommodating hole; part of the gas in the air inlet also flows into the second accommodating hole through the first gas channel, mixes with the gas flowing into the second accommodating hole, and then flows into the first accommodating hole through the third gas channel and out of the air outlet.

[0011] Optionally, the first force arm length is smaller than the second force arm length, the first force arm length is the lever length between the first plug and the rotating shaft, and the second force arm length is the lever length between the second plug and the rotating shaft.

[0012] Optionally, the on-off valve comprises a plug rod, a second elastic member, and a valve cylinder, the valve cylinder is provided with an internal space and a valve inlet and a valve outlet which are both communicated with the internal space, the second elastic member is sleeved on the plug rod, the plug rod is installed in the internal space, and the plug rod is used for controlling the on-off of the valve inlet.

[0013] One end of the valve cylinder is inserted into the air inlet, the valve inlet is communicated with the air inlet, and the valve outlet is communicated with the first accommodating hole.

[0014] Optionally, the plug rod comprises a plugging part and a screw part connected with the plugging part, and the plugging part is used for controlling the on-off of the valve inlet.

[0015] The on-off valve further comprises a sliding block sleeved on the screw rod, the second elastic member is sleeved on the screw rod, and one end of the second elastic member is in abutment with one end of the sliding block away from the plugging part.

[0016] Optionally, a plurality of valve outlets are annularly and spacedly arranged on the outer wall of the valve cylinder.

[0017] Optionally, the base is further provided with a fourth gas channel communicated with the air inlet, and the medical ventilation device further comprises a siren, and an air inlet of the siren is communicated with one end of the fourth gas channel away from the air inlet.

[0018] The howler is used to emit a howl when the gas pressure in the air inlet is lower than a preset pressure.

[0019] Optionally, the base is further provided with a fifth air channel connecting the first accommodating hole and the fourth air channel;

[0020] The medical ventilation device further comprises a sliding rod slidably mounted in the fifth airway and a third elastic member sleeved on the sliding rod;

[0021] When the gas pressure in the air inlet is greater than a preset pressure, part of the gas in the first accommodating hole flows into the fifth air channel and drives the sliding rod to slide until the sliding rod blocks the air inlet of the howler.

[0022] Optionally, the fifth air channel includes a first inner hole and a second inner hole coaxially arranged and connected to each other, the inner diameter of the first inner hole is smaller than the inner diameter of the second inner hole, an end of the first inner hole away from the first inner hole is connected to the fourth air channel, and the second inner hole is connected to the first accommodating hole;

[0023] The medical ventilation device further comprises a sealing ring sleeved on the sliding rod, wherein the sealing ring abuts against the inner wall of the first inner hole;

[0024] The slide rod is further provided with an annular protrusion abutting against the inner wall of the second inner hole, and opposite ends of the third elastic member respectively abut against the annular protrusion and the inner wall of the second inner hole facing the first inner hole.

[0025] Optionally, the air inlet duct, the first accommodating hole and the air outlet duct are coaxially arranged.

[0026] Another embodiment of the present invention further provides a ventilator comprising the above-mentioned medical ventilation device.

[0027] In the present invention, through the design of the lever assembly, when the gas pressure in the intake duct is greater than the preset pressure, part of the gas in the intake duct causes the on-off valve to be turned on, so that part of the gas in the intake duct will flow into the first receiving hole through the on-off valve, and the gas in the first receiving hole will flow into the second air duct. Since the gas pressure in the second air duct is relatively large, the gas in the second air duct will drive the lever to rotate around the rotating shaft until the first plug is away from the first air duct and the second plug is away from the second air duct. At this time, the first air duct and the second air duct are both connected to the second receiving hole; part of the gas in the intake duct also flows into the second receiving hole through the first air duct (the second receiving hole includes the gas flowing in from the first air duct and the gas flowing in from the second air duct), and the gas in the second receiving hole then flows into the first receiving hole through the third air duct and flows out from the outlet.

[0028] Since the air inlet channel will have a pressure loss when the on-off valve is driven to be open, the first air channel inflow will compensate the pressure of the gas after the pressure loss, so that the gas flowing out of the air outlet channel has sufficient pressure and flow, avoiding the pressure loss of the gas flowing out of the air outlet channel. BRIEF DESCRIPTION OF DRAWINGS

[0029] The present application will be further described below in conjunction with the drawings and examples.

[0030] Figure 1 is a sectional view of a medical ventilation device provided by an embodiment of the present application;

[0031] Figure 2 is a sectional view of a base of a medical ventilation device provided by an embodiment of the present application;

[0032] Figure 3 is a sectional view of an on-off valve of a medical ventilation device provided by an embodiment of the present application;

[0033] Figure 4 is a partial sectional view of a medical ventilation device provided by an embodiment of the present application.

[0034] The reference signs in the description are as follows:

[0035] 1, on-off valve; 11, plugging rod; 111, plugging part; 112, screw part; 12, second elastic member; 13, valve cylinder; 131, internal space; 132, valve inlet; 133, valve outlet; 14, sliding block; 2, lever assembly; 21, first elastic member; 22, rotating shaft; 23, lever; 231, first plug; 232, second plug; 3, base; 31, air inlet channel; 32, air outlet channel; 33, first accommodating hole; 34, second accommodating hole; 35, first air channel; 36, second air channel; 37, third air channel; 38, fourth air channel; 39, fifth air channel; 391, first inner hole; 392, second inner hole; 4, whistler; 5, sliding rod; 51, sealing ring; 52, annular protruding part; 6, third elastic member. DETAILED DESCRIPTION

[0036] In order to make the technical problems solved by the present application, technical solutions and beneficial effects more clearly understood, the present application will be further described in detail below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0037] It should be understood that the terms "upper", "lower", "left", "right", "front", "back", "middle", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0038] like Figure 1 As shown, a medical ventilation device provided by one embodiment of the present invention includes an on-off valve 1, a lever assembly 2 and a base 3;

[0039] The base 3 is provided with an air inlet duct 31, an air outlet duct 32, a first accommodating hole 33, a second accommodating hole 34, a first air duct 35, a second air duct 36 and a third air duct 37. The air inlet duct 31 and the air outlet duct 32 are both connected to the first accommodating hole 33, the opposite ends of the first air duct 35 are respectively connected to the air inlet duct 36 and the second accommodating hole 34, and the opposite ends of the second air duct 36 and the third air duct 37 are respectively connected to the first accommodating hole 33 and the second accommodating hole 34; preferably, the air inlet duct 31, the first accommodating hole 33 and the air outlet duct 32 are coaxially arranged; and the air inlet duct 31 and the air outlet duct 32 are respectively connected to the opposite ends of the first accommodating hole 33.

[0040] The on-off valve 1 is installed in the first accommodating hole 33 and is used to control the on-off between the air intake duct 31 and the first accommodating hole 33; it can be understood that when the on-off valve 1 is in the on state, the air intake duct 31 is connected to the first accommodating hole 33; when the on-off valve 1 is in the off state, the air intake duct 31 is not connected to the first accommodating hole 33.

[0041] The lever assembly 2 comprises a first elastic member 21, a rotating shaft 22, and a lever 23 provided with a first plug 231 and a second plug 232, the lever 23 is rotatably installed in the second accommodating hole 34 through the rotating shaft 22, the first plug 231 is used for plugging or conducting the end of the first gas channel 35 away from the air inlet 31 (that is, the first plug 231 is used for controlling the on-off between the first gas channel 35 and the second accommodating hole 34), the second plug 232 is used for plugging or conducting the end of the second gas channel 36 away from the first accommodating hole 33 (that is, the second plug 232 is used for controlling the on-off between the second gas channel 36 and the second accommodating hole 34), the first elastic member 21 abuts against the end of the lever 23 away from the first plug 231; It can be understood that the first elastic member 21 includes but is not limited to a spring and the like; When part of the gas in the air inlet 31 flows into the first gas channel 35, due to the rebounding force of the first elastic member 21, the first plug 231 keeps the state of plugging the first gas channel 35, that is, the gas in the first gas channel 35 cannot drive the lever 23 to rotate, and the first plug 231 and the second plug 232 both keep the state of plugging.

[0042] When the gas pressure of the air inlet 31 is greater than the preset pressure, part of the gas in the air inlet 31 flows into the first accommodating hole 33 and the second gas channel 36 through the on-off valve 1, the gas in the second gas channel 36 drives the lever 23 to rotate so that the first gas channel 35 and the second gas channel 36 are both communicated with the second accommodating hole 34; Part of the gas in the air inlet 31 also flows into the second accommodating hole 34 through the first gas channel 35, mixes with the gas flowing from the second gas channel 36, and then flows into the first accommodating hole 33 through the third gas channel 37 and flows out from the air outlet 32.

[0043] In the present application, by the design of the lever assembly 2, when the gas pressure in the air inlet channel 31 is greater than the preset pressure, part of the gas in the air inlet channel 31 makes the on-off valve 1 conduct, so that part of the gas in the air inlet channel 31 flows into the first containing hole 33 through the on-off valve 1, the gas in the first containing hole 33 flows into the second air channel 36, and due to the greater gas pressure in the second air channel 36, the gas in the second air channel 36 drives the lever 23 to rotate around the rotating shaft 22 until the first plug 231 is away from the first air channel 35 and the second plug 232 is away from the second air channel 36, at this time, the first air channel 35 and the second air channel 36 are both communicated with the second containing hole 34; part of the gas in the air inlet channel 31 also flows into the second containing hole 34 through the first air channel 35 (the second containing hole 34 includes the gas flowing from the first air channel 35 and the gas flowing from the second air channel 36), and the gas in the second containing hole 34 flows into the first containing hole 33 through the third air channel 37 and flows out from the air outlet channel 32.

[0044] Since the air inlet channel 31 will have a pressure loss when it drives the on-off valve 1 to conduct, the gas flowing from the first air channel 35 will compensate the pressure loss of the gas, so that the gas flowing out of the air outlet channel 32 has sufficient pressure and flow rate, avoiding the pressure loss of the gas flowing out of the air outlet channel 32.

[0045] Need to be explained, when the gas in the second air channel 36 drives the lever 23 to rotate, the lever 23 will compress the first elastic member 21; when the gas pressure in the air inlet channel 31 is less than the preset pressure, the rebound force of the first elastic member 21 will drive the lever 23 to rotate until the first plug 231 blocks the first air channel 35 and the second plug 232 blocks the second air channel 36.

[0046] In an embodiment, as shown in Figure 1 The first force arm length is the length of the lever 23 between the first plug 231 and the rotating shaft 22, and the second force arm length is the length of the lever 23 between the second plug 232 and the rotating shaft 22. It can be understood that the first force arm length between the first plug 231 and the rotating shaft 22 is less than the second force arm length between the second plug 232 and the rotating shaft 22, according to the principle of lever, the force acting on the second plug 232 is smaller than the force acting on the first plug 231, which can drive the lever 23 to rotate, that is, only the smaller gas pressure in the second air channel 36 can drive the lever 23 to rotate, thereby ensuring the stability of the rotation of the lever 23.

[0047] In an embodiment, as shown in Figure 1 and Figure 3 The on-off valve 1 comprises a plug rod 11, a second elastic member 12, and a valve cylinder 13, the valve cylinder 13 is provided with an internal space 131, a valve inlet 132 and a valve outlet 133 which are all communicated with the internal space 131, the second elastic member 12 is sleeved on the plug rod 11, the plug rod 11 is installed in the internal space 131, and the plug rod 11 is used to control the on-off of the valve inlet 132; it can be understood that the second elastic member 12 includes but is not limited to a spring and the like.

[0048] One end of the valve cylinder 13 is inserted into the air inlet channel 31, the valve inlet 132 is communicated with the air inlet channel 31, and the valve outlet 133 is communicated with the first containing hole 33.

[0049] Specifically, when the gas pressure in the air inlet channel 31 is greater than a preset pressure, the gas in the air inlet channel 31 drives the plug rod 11 to move and compresses the second elastic member 12 through the valve inlet 132, so that the plug rod 11 is away from the valve inlet 132, and thus the air inlet channel 31 is communicated with the first containing hole 33 through the valve inlet 132, the internal space 131 and the valve outlet 133 in sequence; when the gas pressure in the air inlet channel 31 is less than the preset pressure, the rebound force of the second elastic member 12 drives the plug rod 11 to move until the plug rod 11 blocks the valve inlet 132. It should be noted that in the process of driving the plug rod 11 to move by the gas in the air inlet channel 31, the gas in the air inlet channel 31 needs to overcome the elastic force of the second elastic member 12, so that the gas in the air inlet channel 31 has a pressure loss when flowing into the first containing hole 33. In this embodiment, the on-off valve 1 has simple structure and low manufacturing cost.

[0050] In an embodiment, as shown in Figure 3 The plug rod 11 comprises a plugging part 111 and a screw part 112 connected with the plugging part 111, and the plugging part 111 is used to control the on-off of the valve inlet 132; it can be understood that the outer diameter of the screw part 112 is greater than the inner diameter of the valve inlet 132 and less than the inner diameter of the internal space 131.

[0051] The on-off valve 1 further comprises a threaded sleeve of the screw portion 112 on the slider 14, the second elastic member 12 is sleeved on the screw portion 112, and one end of the second elastic member 12 abuts against the end of the slider 14 away from the blocking portion 111. It can be understood that the screw portion 112 is provided with external threads, the slider 14 is provided with a through hole, the inner wall of the through hole is provided with internal threads, and the slider 5 is sleeved on the screw portion 112 through the threaded connection of the external threads and the internal threads; the end of the second elastic member 12 away from the blocking portion 111 can abut against the inner wall of the internal space 131.

[0052] Specifically, by rotating the plug rod 11, the screw portion 112 on the plug rod 11 drives the slider 14 to move, so as to adjust the compression amount of the second elastic member 12, that is, to achieve the effect of adjusting the preset pressure of the on-off valve 1; the preset pressure of the on-off valve 1 is adjustable, which improves the applicability and universality of the medical ventilation device.

[0053] In an embodiment, as shown in Figure 1 and Figure 3 The outer wall of the valve cylinder 13 is provided with a plurality of annularly spaced valve outlets 133. It can be understood that the valve inlet 132 is arranged at one end of the valve cylinder 13, the valve outlet 133 is arranged on the side wall of the valve cylinder 13, and the internal space 131 is communicated with the first containing hole 33 through the plurality of circumferentially arranged valve outlets 133, so as to ensure the smoothness of the gas flowing into the first containing hole 33 from the on-off valve 1.

[0054] In an embodiment, as shown in Figure 1 The base 3 is further provided with a fourth gas channel 38 communicated with the air inlet channel 31, and the medical ventilation device further comprises a siren 4, and the air inlet of the siren 4 is communicated with the end of the fourth gas channel 38 away from the air inlet channel 31.

[0055] The siren 4 is used to emit a siren sound when the gas pressure in the air inlet channel 31 is less than a preset pressure.

[0056] Specifically, when the gas pressure in the air inlet channel 31 is less than a preset pressure, the gas in the air inlet channel 31 flows into the siren 4 through the fourth gas channel 38, so as to cause the siren 4 to emit a siren sound. In this embodiment, the siren 4 can emit a siren sound when the gas flowing into the air inlet channel 31 is less than a preset pressure, so as to achieve the effect of reminding the staff to increase the gas pressure at the front end of the air inlet channel 31; and the siren 4 can achieve the effect of low-pressure alarm.

[0057] In an embodiment, as shown in Figure 1 and Figure 4As shown, the base 3 is further provided with a fifth air passage 39 which is in communication with the first accommodating hole 33 and the fourth air passage 38. It can be understood that the air inlet passage 31 is in communication with the upper end of the first accommodating hole 33, and the air outlet passage 32, the second air passage 36 and the fifth air passage 39 are all in communication with the lower end of the first accommodating hole 33.

[0058] The medical ventilation device further comprises a sliding rod 5 which is slidingly installed in the fifth air passage 39, and a third elastic member 6 which is sleeved on the sliding rod 5. It can be understood that the third elastic member 6 includes but is not limited to a spring and the like.

[0059] When the gas pressure in the air inlet passage 31 is greater than the preset pressure, part of the gas in the first accommodating hole 33 flows into the fifth air passage 39 and drives the sliding rod 5 to slide until the sliding rod 5 blocks the air inlet of the whistle 4.

[0060] Specifically, when the gas pressure in the air inlet passage 31 is less than the preset pressure, the gas flowing from the fourth air passage 38 into the fifth air passage 39 will not drive the sliding rod 5 to move, so that the fourth air passage 38 remains in a state of being in communication with the air inlet of the whistle 4, at this time, the whistle 4 will emit a whistle; when the gas pressure in the air inlet passage 31 is greater than the preset pressure, the on-off valve 1 is turned on, part of the gas in the air inlet passage 31 flows into the first accommodating hole 33 through the on-off valve 1, part of the gas in the first accommodating hole 33 will flow into the fifth air passage 39, and the gas in the fifth air passage 39 will drive the sliding rod 5 to move and compress the third elastic member 6 until the sliding rod 5 blocks the air inlet of the whistle 4, that is, the air inlet of the whistle 4 is not in communication with the fourth air passage 38 and the fifth air passage 39, at this time, the whistle 4 will not emit a whistle; when the gas pressure in the air inlet passage 31 is less than the preset pressure, the rebound force of the third elastic member 6 will drive the sliding rod 5 to move, so that the fourth air passage 38 is in communication with the air inlet of the whistle 4.

[0061] In this embodiment, the design of the sliding rod 5 and the third elastic member 6 makes the medical ventilation device not emit a whistle when the air inlet pressure is greater than the preset pressure, and emit a whistle when the air inlet pressure is less than the preset pressure.

[0062] In an embodiment, as shown in Figure 1 and Figure 4 As shown, the fifth air passage 39 comprises a first inner hole 391 and a second inner hole 392 which are coaxially arranged and in communication with each other, the inner diameter of the first inner hole 391 is smaller than that of the second inner hole 392, and the first inner hole 391 is in communication with the fourth air passage 38 at one end away from the first inner hole 391, and the second inner hole 392 is in communication with the first accommodating hole 33.

[0063] The medical ventilation device further comprises a sealing ring 51 sleeved on the sliding rod 5, and the sealing ring 51 abuts against the inner wall of the first inner hole 391.

[0064] The sliding rod 5 is further provided with an annular protrusion 52 abutting against the inner wall of the second inner hole 392, and the opposite ends of the third elastic member 6 respectively abut against the annular protrusion 52 and the inner wall of the end of the second inner hole 392 facing the first inner hole 391. Understandably, the annular protrusion 52 can play a role of disconnecting the second inner hole 392 from the first inner hole 391, so that the gas in the second inner hole 392 cannot flow into the howler 4 through the first inner hole 391.

[0065] Specifically, when the gas in the air inlet channel 31 is greater than a preset pressure, the gas in the air inlet channel 31 flows into the first containing hole 33 through the on-off valve 1, the gas in the first containing hole 33 flows into the second inner hole 392 and acts on the annular protrusion 52, the gas in the second inner hole 392 drives the sliding rod 5 to move and compresses the third elastic member 6, until the sealing ring 51 sleeved on the sliding rod 5 moves to above the air inlet of the howler 4, at this time, the sealing ring 51 disconnects the fourth air inlet channel 31 from the air inlet of the howler 4, so that no gas flows into the air inlet of the howler 4, and the howler 4 will not emit a howl; when the gas pressure in the air inlet channel 31 is less than the preset pressure, the sliding rod 5 moves under the action of the gas flowing in through the fourth air channel 38 and the rebound force of the third elastic member 6, until the sealing ring 51 moves to below the air inlet, at this time, the fourth air channel 38 communicates with the air inlet of the howler 4, and the howler 4 emits a low-pressure howl.

[0066] Another embodiment of the present application further provides a breathing machine comprising the medical ventilation device described above.

[0067] The above is only an embodiment of the medical ventilation device of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A medical ventilation device, characterized in that: Including on-off valve, lever assembly and base; The base is provided with an air inlet, an air outlet, a first receiving hole, a second receiving hole, a first air channel, a second air channel, and a third air channel. The air inlet and the air outlet are both connected to the first receiving hole. The opposite ends of the first air channel are respectively connected to the air inlet and the second receiving hole. The opposite ends of the second air channel and the third air channel are respectively connected to the first receiving hole and the second receiving hole. The on-off valve is installed in the first receiving hole and is used to control the on-off between the air inlet passage and the first receiving hole; The lever assembly includes a first elastic member, a rotating shaft, and a lever provided with a first plug and a second plug. The lever is rotatably mounted in the second receiving hole via the rotating shaft. The first plug is used to block or open an end of the first air passage away from the air inlet. The second plug is used to block or open an end of the second air passage away from the first receiving hole. The first elastic member abuts against an end of the lever away from the first plug. When the gas pressure in the air intake duct is greater than a preset pressure, part of the gas in the air intake duct flows into the first receiving hole and the second air duct through the on-off valve, and the gas in the second air duct drives the lever to rotate so that the first air duct and the second air duct are both connected to the second receiving hole; part of the gas in the air intake duct also flows into the second receiving hole through the first air duct and mixes with the gas flowing into the second air duct, and then flows into the first receiving hole through the third air duct and flows out from the air outlet duct.

2. The medical ventilation device according to claim 1, characterized in that The first lever arm length is smaller than the second lever arm length. The first lever arm length is the lever length between the first plug and the rotating shaft. The second lever arm length is the lever length between the second plug and the rotating shaft.

3. The medical ventilation device according to claim 1, characterized in that The on-off valve comprises a blocking rod, a second elastic member, and a valve cylinder. The valve cylinder is provided with an internal space and a valve inlet and a valve outlet both communicating with the internal space. The second elastic member is sleeved on the blocking rod, the blocking rod is installed in the internal space, and the blocking rod is used to control the on-off of the valve inlet. One end of the valve cylinder is inserted into the air inlet, the valve inlet is connected to the air inlet, and the valve outlet is connected to the first accommodating hole.

4. The medical ventilation device according to claim 3, characterized in that The blocking rod includes a blocking portion and a screw portion connected to the blocking portion, and the blocking portion is used to control the on-off of the valve inlet; The on-off valve further includes a slider threadedly sleeved on the screw portion, the second elastic member is sleeved on the screw portion, and one end of the second elastic member abuts against an end of the slider away from the blocking portion.

5. The medical ventilation device according to claim 3, characterized in that The outer wall of the valve cylinder is provided with a plurality of valve outlets distributed at annular intervals.

6. The medical ventilation device according to claim 1, characterized in that The base is further provided with a fourth air channel connected to the air inlet channel, and the medical ventilation device further comprises a whistle, the air inlet of the whistle being connected to an end of the fourth air channel away from the air inlet channel; The howler is used to emit a howl when the gas pressure in the air inlet is lower than a preset pressure.

7. The medical ventilation device according to claim 6, characterized in that The base is further provided with a fifth air channel connecting the first receiving hole and the fourth air channel; The medical ventilation device further comprises a sliding rod slidably mounted in the fifth airway and a third elastic member sleeved on the sliding rod; When the gas pressure in the air inlet is greater than a preset pressure, part of the gas in the first accommodating hole flows into the fifth air channel and drives the sliding rod to slide until the sliding rod blocks the air inlet of the howler.

8. The medical ventilation device according to claim 7, characterized in that The fifth air channel includes a first inner hole and a second inner hole coaxially arranged and connected to each other, the inner diameter of the first inner hole is smaller than the inner diameter of the second inner hole, the end of the first inner hole away from the first inner hole is connected to the fourth air channel, and the second inner hole is connected to the first receiving hole; The medical ventilation device further comprises a sealing ring sleeved on the sliding rod, wherein the sealing ring abuts against the inner wall of the first inner hole; The slide rod is further provided with an annular protrusion abutting against the inner wall of the second inner hole, and opposite ends of the third elastic member respectively abut against the annular protrusion and the inner wall of the second inner hole facing the first inner hole.

9. The medical ventilation device according to claim 1, characterized in that The air inlet, the first accommodating hole and the air outlet are coaxially arranged.

10. A ventilator, characterized in that: Comprising the medical ventilation device according to any one of claims 1 to 9.

Images