A safety valve and a medical ventilator

Abstract

This application provides a safety valve and a medical ventilator. The safety valve includes a valve body and an opening / closing assembly. The valve body includes a gas output channel with a gas inlet and a gas outlet, and an exhaust channel with an exhaust outlet. The gas inlet receives gas, which flows along the gas output channel and is delivered to the patient through the gas outlet. The exhaust channel is connected to the gas output channel via a connecting port. The opening / closing assembly includes a driving element and an opening / closing element. The driving element is disposed in the valve body and drives the opening / closing element to move, thereby connecting or disconnecting the exhaust channel between the exhaust outlet and the gas output channel. When the safety valve is in use and installed on the medical ventilator, the angle between the exhaust direction of the exhaust outlet and the direction of gravity is greater than 90 degrees. The safety valve of this application embodiment can effectively prevent condensate from flowing from the exhaust outlet to the outside of the safety valve.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a safety valve and a medical ventilator. Background Technology

[0002] The safety valve is an integral part of a ventilator. As the inspiratory inlet of the machine, it connects to external breathing tubing or other medical accessories. The safety valve is primarily used for active pressure relief to prevent the pressure in the airway system from exceeding the set pressure.

[0003] During the depressurization process of the safety valve, the gas in the pipeline is discharged to the outside of the pipeline through the vent on the safety valve. However, in some related technologies, the safety valve of a ventilator has the vent located inside the ventilator. Since the gas in the pipeline contains a certain amount of condensate, during the depressurization process, the condensate will flow into the interior of the ventilator along with the gas, thus affecting the reliability of the ventilator. Summary of the Invention

[0004] In view of this, the present application aims to provide a safety valve and a medical ventilator to solve the technical problem in the related art that condensate water flows out of the safety valve along with the gas during the depressurization process.

[0005] To achieve the above objectives, one embodiment of this application provides a safety valve that can be applied to a medical ventilator, comprising:

[0006] The valve body includes a gas output channel with a gas inlet and a gas outlet, and an exhaust channel with an exhaust outlet. The gas inlet is used to receive gas, the gas flows along the gas output channel, and the gas is delivered to the patient through the gas outlet. The exhaust channel is connected to the gas output channel through a communication port.

[0007] An opening and closing assembly, comprising a driving component and an opening and closing component, wherein the driving component is disposed on the valve body, and the driving component drives the opening and closing component to move, thereby connecting or disconnecting the exhaust channel between the exhaust port and the gas output channel.

[0008] Wherein, when the safety valve is in use and installed on the medical ventilator, the angle between the exhaust direction of the exhaust port and the direction of gravity is greater than 90 degrees.

[0009] Another embodiment of this application provides a medical ventilator, including a housing and a component disposed within the housing:

[0010] Air intake;

[0011] Oxygen supply assembly, used to connect to oxygen supply devices;

[0012] A gas delivery component that is connected to the oxygen supply component and the air inlet;

[0013] The safety valve described above has a gas inlet connected to the gas transmission assembly, so as to output the gas formed by mixing air and oxygen through the gas output channel.

[0014] This application provides a safety valve and a medical ventilator. The safety valve includes a valve body and an opening and closing component. When the safety valve is installed in the medical ventilator, the angle between the exhaust direction of the safety valve's exhaust port and the direction of gravity is greater than 90 degrees. During the pressure relief process, the condensate that flows with the gas to the exhaust port can flow back into the exhaust channel under its own gravity. In other words, the condensate can separate from the gas at the exhaust port and is unlikely to flow to the outside of the exhaust port with the gas. Therefore, for medical ventilators with the exhaust port located inside the medical ventilator, it can better prevent condensate from flowing into the medical ventilator and affecting the reliability of the medical ventilator. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of a medical ventilation device according to an embodiment of this application. The dashed arrows in the figure indicate the exhaust direction.

[0016] Figure 2 for Figure 1 The diagram shows the structure of the safety valve in use. The dashed arrows in the diagram indicate the direction of exhaust, and the solid arrows opposite to the dashed arrows indicate the direction of gravity.

[0017] Figure 3 for Figure 2 The diagram shows a cross-sectional view of a safety valve. The opening and closing element in the diagram is in the state of cutting off the exhaust passage. The dashed arrow in the diagram indicates the direction of gas flow along the exhaust passage.

[0018] Figure 4 for Figure 2 A partial cross-sectional view of the safety valve shown;

[0019] Figure 5 for Figure 2 The diagram shown is a structural schematic of the safety valve in use from another perspective. The dashed arrow in the diagram indicates the extension direction of the drive rod, and the solid arrow below the dashed arrow indicates the direction of gravity.

[0020] Figure 6 for Figure 5 AA section view;

[0021] Figure 7 for Figure 5 The diagram shows a partial cross-sectional view of the safety valve, with the opening and closing element in the state where the exhaust passage is open.

[0022] Explanation of reference numerals in the attached figures

[0023] 10. Safety valve; 11. Valve body; 11a. Gas output channel; 11b. Gas inlet; 11c. Gas outlet; 11d. Exhaust channel; 11d1. First sub-channel; 11d2. Second sub-channel; 11e. Exhaust port; 11f. Connecting port; 11g. Annular boss; 11h. Guide groove; 12. Opening and closing assembly; 121. Driving element; 1211. Driving rod; 1212. Electromagnet; 122. Opening and closing element; 1221. Guide rod; 1222. Diaphragm; 123. Elastic reset element; 13. Flow sensor; 20. Housing; 30. Gas transmission assembly. Detailed Implementation

[0024] In the description of the embodiments in this application, it should be noted that the orientation or positional relationship indicated by terms such as "gravity direction" is based on the appendix. Figure 1 The indicated orientation or positional relationship, where "radial" refers to the orientation relative to the attached... Figure 1 The "axial direction" shown is perpendicular to the direction. These directional terms are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0025] This application provides a medical ventilation device that mainly generates, controls, and regulates a patient's breathing through mechanical ventilation.

[0026] For example, medical ventilation equipment can be medical devices such as ventilators and anesthesia machines.

[0027] This application describes an embodiment of a medical ventilation device, specifically a ventilator.

[0028] Please see Figure 1 The medical ventilation device of this application embodiment includes a housing 20 and an air inlet (not shown in the figure) disposed on the housing 20, an oxygen supply component (not shown in the figure), a gas delivery component 30 and a safety valve 10.

[0029] The oxygen supply assembly is used to connect to an oxygen supply device. The oxygen supply assembly can be used to control the oxygen flow rate of the oxygen supply device. For example, the oxygen supply device includes a proportional valve, a flow sensor 13, and an oxygen input interface connected to the oxygen supply device.

[0030] The gas delivery component 30 is connected to the oxygen supply component and to the air inlet.

[0031] Please see Figures 2 to 7 The safety valve 10 includes a valve body 11 and an opening / closing assembly 12.

[0032] The valve body 11 includes a gas output channel 11a with a gas inlet 11b and a gas outlet 11c, and an exhaust channel 11d with an exhaust outlet 11e. The gas inlet 11b is used to receive gas, which flows along the gas output channel 11a and is delivered to the patient through the gas outlet 11c. The exhaust channel 11d is connected to the gas output channel 11a through a communication port 11f.

[0033] Specifically, the gas inlet 11b is connected to the gas transfer assembly 30 so as to output the gas formed by mixing air and oxygen through the gas output channel 11a.

[0034] Please continue reading. Figures 2 to 7 The opening and closing assembly 12 includes a driving element 121 and an opening and closing element 122. The driving element 121 is disposed on the valve body 11. The driving element 121 drives the opening and closing element 122 to move, thereby connecting or disconnecting the exhaust passage 11d between the exhaust port 11e and the gas output passage 11a. In other words, it connects or disconnects the exhaust passage 11d between the exhaust port 11e and the gas output passage 11a. That is, when the opening and closing element 122 opens the exhaust passage 11d to the area between the exhaust port 11e and the gas output passage 11a, the gas output passage 11a and the exhaust port 11e are connected. Part of the gas in the gas output passage 11a flows to the exhaust port 11e through the exhaust passage 11d and is discharged from the exhaust port 11e (see reference). Figure 7 (As shown in the diagram). When the opening / closing element 122 closes the exhaust passage 11d in the area between the exhaust port 11e and the gas output passage 11a, the gas output passage 11a and the exhaust port 11e are not connected, and the gas in the gas output passage 11a cannot be discharged from the exhaust port 11e (see reference). Figure 3 (The state shown).

[0035] The structure of the driving element 121 is not limited, as long as it can drive the opening / closing element 122 to move. For an example, please refer to [reference needed]. Figure 3 and Figure 7 The driving component 121 can be equipped with a driving rod 1211, which drives the opening and closing component 122 to move by extending and retracting.

[0036] For example, please refer to Figure 3 and Figure 7 The driving component 121 can be an electromagnetic driving component 121. The electromagnetic driving component 121 is equipped with an electromagnet 1212 and a driving rod 1211. The electromagnet 1212 causes the driving rod 1211 to extend and retract by energizing and de-energizing.

[0037] It should be noted that the electromagnet 1212 can extend the drive rod 1211 when it is energized and retract the drive rod 1211 when it is de-energized, or it can extend the drive rod 1211 when it is de-energized and retract the drive rod 1211 when it is energized.

[0038] For example, the controller of the medical ventilator can be signal-connected to the drive 121 to control the start and stop of the drive 121.

[0039] The manner in which the opening and closing element 122 opens or closes the exhaust passage 11d is not limited; for example, please refer to [reference needed]. Figure 3 and Figure 7 A portion of the sidewall of the exhaust passage 11d can protrude inward to form an annular boss 11g located between the exhaust port 11e and the gas output passage 11a. The opening / closing member 122 abuts against the annular boss 11g to close the area of ​​the exhaust passage 11d between the exhaust port 11e and the gas output passage 11a. When the opening / closing member 122 is driven by the driving member 121 to separate from the annular boss 11g, the opening / closing member 122 opens the area of ​​the exhaust passage 11d between the exhaust port 11e and the gas output passage 11a.

[0040] In other words, the inner side of the annular boss 11g is a channel for gas to pass through. After the opening and closing member 122 abuts against the annular boss 11g, the channel on the inner side of the annular boss 11g is blocked, and gas cannot pass through, thereby cutting off the exhaust channel 11d. When the opening and closing member 122 is driven by the driving member 121 to move and separate from the annular boss 11g, the channel on the inner side of the annular boss 11g is opened, and gas can pass through the channel on the inner side of the annular boss 11g, thereby realizing the opening of the exhaust channel 11d.

[0041] In other embodiments, the opening / closing member 122 may also extend into the channel inside the annular boss 11g and abut against the side wall of the channel to block the exhaust channel 11d.

[0042] Please see Figure 2 When the safety valve 10 is in use and installed on a medical ventilator, the angle θ1 between the exhaust direction of the exhaust port 11e and the direction of gravity is greater than 90 degrees. That is to say, after the safety valve 10 is installed on the medical ventilator, the exhaust direction of the exhaust port 11e is neither horizontal nor downward or directly downward, but upward or directly upward.

[0043] For example, Figure 2 When the safety valve 10 shown is in use and installed on a medical ventilator, the angle θ1 between the exhaust direction and the direction of gravity is 180 degrees, that is, the exhaust direction is directly upward.

[0044] The exhaust port 11e is mainly used to relieve pressure on the medical ventilator. For example, when the medical ventilator is in a ventilation state where the airway pressure is lower than the set pressure, the opening / closing element 122 can close the exhaust channel 11d. That is, the gas formed by mixing air and oxygen in the gas delivery assembly 30 flows along the gas output channel 11a and is delivered to the patient through the gas output port 11c. The gas in the gas output channel 11a will not be discharged from the exhaust port 11e. When the airway pressure reaches the set pressure, the opening / closing element 122 can open the exhaust channel 11d between the exhaust port 11e and the gas output channel 11a. In other words, after the airway pressure reaches the set pressure, according to the set triggering conditions, the driving element 121 can drive the opening / closing element 122 to open the exhaust channel 11d between the exhaust port 11e and the gas output channel 11a. After the exhaust channel 11d is opened, some gas in the gas output channel 11a is discharged from the exhaust port 11e, thereby relieving pressure. After some gas is discharged from the exhaust port 11e, if the gas pressure is less than the set pressure, the drive component 121 can drive the opening and closing component 122 to close the exhaust passage 11d to stop the pressure relief.

[0045] For example, the medical ventilator may be equipped with a pressure monitoring module connected to the controller, and the pressure monitoring module is connected to the safety valve 10. The pressure monitoring module can monitor the airway pressure of the medical ventilator. For example, the pressure monitoring module can monitor the pressure at the end near the medical ventilator and the pressure at the proximal end near the patient, and send the pressure monitoring results to the controller. The controller can compare the pressure monitoring results with the set pressure and trigger the start / stop control of the drive unit 121 according to the comparison result. For example, if the pressure at at least one of the end pressure and the proximal pressure is greater than the set pressure, it can be considered that the airway pressure has reached the set pressure. If the set trigger condition is that the pressure relief operation is triggered when the airway pressure reaches the set pressure, the controller can control the drive unit 121 to start, so as to drive the opening and closing element 122 to open the exhaust passage 11d between the exhaust port 11e and the gas output passage 11a. If the set trigger condition is that the air pressure continues to rise to a certain pressure value after reaching the set pressure before triggering the pressure relief operation, such as rising another 5 cm of water column, then the controller needs to control the drive unit 121 to start after the air pressure continues to rise and reaches the corresponding pressure value.

[0046] When the safety valve 10 is in use and installed on the medical ventilator, the angle θ1 between the exhaust direction of the exhaust port 11e and the direction of gravity is greater than 90 degrees. During the depressurization process, the condensate that flows to the exhaust port 11e with the gas can flow back into the exhaust channel 11d under its own gravity. In other words, the condensate can separate from the gas at the exhaust port 11e and is unlikely to flow to the outside of the exhaust port 11e with the gas. Therefore, for medical ventilators with the exhaust port 11e located inside the medical ventilator, it can better prevent condensate from flowing into the medical ventilator and affecting the reliability of the medical ventilator.

[0047] Additionally, it should be noted that the safety valve 10 in this embodiment is not limited to having the exhaust port 11e located inside the medical ventilator. In other embodiments, the exhaust port 11e may also be located outside the medical ventilator, which means that the gas can be directly discharged into the external environment.

[0048] In one embodiment, please refer to Figure 1 and Figure 4 When the safety valve 10 is in use, the vent 11e can be located at the top of the vent passage 11d. Positioning the vent 11e at the top of the vent passage 11d allows for better backflow of condensate that flows with the gas to the vent 11e, thus better preventing condensate from flowing outside the vent 11e with the gas.

[0049] It should be noted that when the safety valve 10 is in use, the exhaust port 11e is not limited to being located at the top of the exhaust channel 11d. In some other embodiments, the exhaust port 11e can also be located at other positions in the exhaust channel 11d. For example, the exhaust port 11e can also be located on one side of the exhaust channel 11d along the horizontal direction, as long as the angle θ1 between the exhaust direction of the exhaust port 11e and the gravity direction of the safety valve 10 is greater than 90 degrees.

[0050] In one embodiment, please refer to Figure 3 and Figure 6 The exhaust passage 11d may be provided with at least a first sub-passage 11d1. The first sub-passage 11d1 has a first end D1 that is connected to the gas output passage 11a through the connecting port 11f, and a second end D2 that is opposite to the first end D1. When the safety valve 10 is in use, the ground height of the second end D2 is higher than the ground height of the first end D1.

[0051] Figure 3 In addition to the first sub-channel 11d1, the exhaust channel 11d also has a second sub-channel 11d2 with an exhaust port 11e. The second sub-channel 11d2 is connected to the first sub-channel 11d1. The opening and closing element 122 is located in the second sub-channel 11d2. That is to say, the opening and closing element 122 can open or close the second sub-channel 11d2.

[0052] In some other embodiments, the exhaust passage 11d may also be provided with only the first sub-passage 11d1. For the exhaust passage 11d that is provided with only the first sub-passage 11d1, the opening and closing member 122 may be provided in the first sub-passage 11d1.

[0053] For ease of arranging the first sub-channel 11d1, please refer to the example provided. Figure 3 When the safety valve 10 is in use, the projection of the first sub-channel 11d1 on the horizontal projection plane can be perpendicular to the projection of the gas output channel 11a on the horizontal projection plane.

[0054] Figure 3 The plane containing the three intersecting center lines is parallel to the horizontal projection plane. Figure 3 The angle θ2 between the centerline of the first sub-channel 11d1 and the centerline of the gas output channel 11a is the angle between the projection of the first sub-channel 11d1 onto the horizontal projection plane and the projection of the gas output channel 11a onto the horizontal projection plane. The projection of the first sub-channel 11d1 onto the horizontal projection plane is perpendicular to the projection of the gas output channel 11a onto the horizontal projection plane, which is equivalent to θ2 being equal to 90 degrees.

[0055] In other embodiments, when the safety valve 10 is in use, the angle θ2 between the projection of the first sub-channel 11d1 on the horizontal projection plane and the projection of the gas output channel 11a on the horizontal projection plane can also be greater than 0 degrees and less than 90 degrees.

[0056] During the depressurization process, in addition to the condensate flowing back from the exhaust port 11e into the exhaust channel 11d, some condensate will remain in the exhaust channel 11d as it flows with the gas towards the exhaust port 11e. If a large amount of condensate accumulates in the exhaust channel 11d, this condensate may flow into the drive component 121 or flow out with the gas from the exhaust port 11e. Therefore, by setting the first sub-channel 11d1, and when the safety valve 10 is in use, making the ground clearance of the second end D2 of the first sub-channel 11d1 higher than that of the first end D1, the condensate in the exhaust channel 11d can flow back along the first sub-channel 11d1 into the gas output channel 11a, thereby minimizing the accumulation of condensate in the exhaust channel 11d.

[0057] In one embodiment, please refer to Figure 3 For a safety valve 10 with a second sub-channel 11d2, when the safety valve 10 is in use, the angle θ3 between the projection of the second sub-channel 11d2 on the horizontal projection plane and the projection of the first sub-channel 11d1 on the horizontal projection plane can be greater than 0 degrees and less than 180 degrees.

[0058] In other words, the first sub-channel 11d1 and the second sub-channel 11d2 can form a certain angle, which makes it easier to arrange the second sub-channel 11d2 and the drive component 121, so that the overall structure of the safety valve 10 can be relatively compact, thereby saving the installation space of the medical ventilator.

[0059] More preferably, please refer to Figure 3 The angle θ3 between the projection of the second sub-channel 11d2 on the horizontal projection plane and the projection of the first sub-channel 11d1 on the horizontal projection plane can be equal to 90 degrees.

[0060] In some other embodiments, when the safety valve 10 is in use, the angle θ3 between the projection of the second sub-channel 11d2 on the horizontal projection plane and the projection of the first sub-channel 11d1 on the horizontal projection plane can also be equal to 180 degrees. That is, the projection of the second sub-channel 11d2 on the horizontal projection plane and the projection of the first sub-channel 11d1 on the horizontal projection plane can be on a straight line.

[0061] Further, please refer to Figure 3 and Figure 4 The extension direction of the second sub-channel 11d2 can also be parallel to the extension direction of the gas output channel 11a, thereby making the overall structure of the safety valve 10 relatively compact.

[0062] In one embodiment, please refer to Figures 3 to 5 For the drive element 121 with drive rod 1211, please refer to Figure 5 When the safety valve 10 is in use, the angle θ4 between the extension direction of the drive rod 1211 and the direction of gravity can be greater than or equal to 60 degrees. That is to say, the drive rod 1211 does not extend vertically upward, or in other words, when the safety valve 10 is in use, the drive element 121 is not located directly below the gas output channel 11a. Therefore, it can better prevent residual condensate in the exhaust channel 11d from flowing into the interior of the drive element 121 and damaging the drive element 121.

[0063] More preferably, please refer to Figure 5 When the safety valve 10 is in use, the angle θ4 between the extension direction of the drive rod 1211 and the direction of gravity is greater than or equal to 90 degrees. That is to say, the drive member 121 can be set in the horizontal direction, or the drive member 121 can be set with the end near the exhaust channel 11d at a lower height from the ground than the end away from the exhaust channel 11d. This can better prevent the condensate water remaining in the exhaust channel 11d from flowing into the interior of the drive member 121.

[0064] In one embodiment, please refer to Figure 3 , Figure 4 and Figure 7The opening / closing element 122 can be equipped with a guide rod 1221 and a diaphragm 1222. The diaphragm 1222 is disposed on the guide rod 1221. A guide groove 11h can be disposed within the exhaust channel 11d. The guide rod 1221 is slidably inserted into the guide groove 11h. A driving element 121 with a driving rod 1211 can be disposed on the side of the diaphragm 1222 facing away from the guide groove 11h, with the driving rod 1211 facing the diaphragm 1222. Please refer to [link / reference]. Figure 3 In the initial state, diaphragm 1222 blocks the exhaust passage 11d located between exhaust port 11e and gas output passage 11a. Please refer to [link / reference]. Figure 7 The drive rod 1211 extends and pushes the diaphragm 1222, causing the diaphragm 1222 to open the exhaust passage 11d between the exhaust port 11e and the gas output passage 11a. In other words, the opening and closing element 122 opens or closes the exhaust passage 11d between the exhaust port 11e and the gas output passage 11a through the diaphragm 1222, while the guide rod 1221 is slidably inserted in the guide groove 11h, which can guide the movement of the diaphragm 1222 to prevent the diaphragm 1222 from shifting position during movement and affecting the opening or closing of the exhaust passage 11d.

[0065] Further, please refer to Figure 3 and Figure 4 The opening and closing assembly 12 may also be provided with an elastic reset member 123. The elastic reset member 123 is sleeved on the guide rod 1221. The elastic reset member 123 applies elastic force to the diaphragm 1222 to drive the opening and closing assembly 122 to reset.

[0066] In other words, by extending and pushing the diaphragm 1222, the drive rod 1211 can cause the elastic reset member 123 to undergo elastic deformation. When the drive rod 1211 retracts, the elastic reset member 123, under its own elastic force, pushes the diaphragm 1222, causing the opening and closing member 122 to reset. The elastic reset member 123 allows the opening and closing member 122 to reset quickly and automatically, thus facilitating the timely shut-off of the exhaust channel 11d by the diaphragm 1222.

[0067] In some embodiments, the opening and closing assembly 12 may not be provided with an elastic reset member 123. For example, the drive rod 1211 can pull the opening and closing member 122 to reset during the retraction process.

[0068] In some embodiments, the opening / closing member 122 may only have a diaphragm 1222 without a guide rod 1221.

[0069] In one embodiment, please refer to Figures 2 to 4 The safety valve 10 can also be equipped with a flow sensor 13, which is connected to the gas output channel 11a to detect the gas flow rate in the gas output channel 11a.

[0070] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A safety valve, characterized in that, The safety valve can be used on medical ventilators, including: The valve body includes a gas output channel with a gas inlet and a gas outlet, and an exhaust channel with an exhaust outlet. The gas inlet is used to receive gas, the gas flows along the gas output channel, and the gas is delivered to the patient through the gas outlet. The exhaust channel is connected to the gas output channel through a communication port. An opening and closing assembly, comprising a driving component and an opening and closing component, wherein the driving component is disposed on the valve body, and the driving component drives the opening and closing component to move, thereby connecting or disconnecting the exhaust channel between the exhaust port and the gas output channel. The exhaust channel includes at least a first sub-channel, which has a first end connected to the gas output channel through the connecting port and a second end opposite to the first end. When the safety valve is in use and installed on the medical ventilator, the second end is higher than the first end in terms of ground clearance, and the angle between the exhaust direction of the exhaust port and the direction of gravity is greater than 90 degrees.

2. The safety valve according to claim 1, characterized in that, When the safety valve is in the operating state, the exhaust port is located at the top of the exhaust passage.

3. The safety valve according to claim 1 or 2, characterized in that, The angle between the exhaust direction and the gravity direction is 180 degrees.

4. The safety valve according to claim 1 or 2, characterized in that, The exhaust passage further includes a second sub-passage communicating with the first sub-passage, the second sub-passage having the exhaust port, and the opening and closing element being disposed within the second sub-passage.

5. The safety valve according to claim 4, characterized in that, When the safety valve is in the operating state, the angle between the projection of the second sub-channel on the horizontal projection plane and the projection of the first sub-channel on the horizontal projection plane is greater than 0 degrees and less than 180 degrees.

6. The safety valve according to claim 5, characterized in that, The angle between the projection of the second sub-channel on the horizontal projection plane and the projection of the first sub-channel on the horizontal projection plane is 90 degrees.

7. The safety valve according to claim 4, characterized in that, When the safety valve is in the operating state, the angle between the projection of the second sub-channel on the horizontal projection plane and the projection of the first sub-channel on the horizontal projection plane is equal to 180 degrees.

8. The safety valve according to claim 4, characterized in that, The extension direction of the second sub-channel is parallel to the extension direction of the gas output channel.

9. The safety valve according to claim 1 or 2, characterized in that, When the safety valve is in the operating state, the projection of the first sub-channel on the horizontal projection plane is perpendicular to the projection of the gas output channel on the horizontal projection plane.

10. The safety valve according to claim 1 or 2, characterized in that, The driving component includes a driving rod, which drives the opening and closing component to move by extending and retracting. When the safety valve is in the operating state, the angle between the extension direction of the driving rod and the direction of gravity is greater than or equal to 60 degrees.

11. The safety valve according to claim 1 or 2, characterized in that, The safety valve also includes a flow sensor, which is connected to the gas output channel to detect the gas flow rate in the gas output channel.

12. The safety valve according to claim 1, characterized in that, A portion of the sidewall of the exhaust passage protrudes into the interior of the exhaust passage to form an annular boss located between the exhaust port and the gas output passage; the opening and closing member abuts against the annular boss to close the exhaust passage between the exhaust port and the gas output passage. The opening and closing member separates from the annular boss under the drive of the driving member, so as to open the exhaust passage between the exhaust port and the gas output passage.

13. The safety valve according to claim 1, characterized in that, The driving component includes a telescopic driving rod, the opening and closing component includes a guide rod and a diaphragm disposed on the guide rod, a guide groove is provided in the exhaust channel, the guide rod is slidably inserted in the guide groove, the driving component is disposed on the side of the diaphragm away from the guide groove, and the driving rod faces the diaphragm; in the initial state, the diaphragm blocks the exhaust channel between the exhaust port and the gas output channel, and the driving rod extends and pushes the diaphragm to open the exhaust channel between the exhaust port and the gas output channel.

14. The safety valve according to claim 12 or 13, characterized in that, The opening and closing assembly also includes an elastic reset member sleeved on the guide rod, which applies elastic force to the diaphragm to drive the opening and closing assembly to reset.

15. The safety valve according to claim 1 or 2, characterized in that, The driving component is an electromagnetic driving component.

16. A medical ventilator, characterized in that, Includes the housing and the components housed within the housing: Air intake; Oxygen supply assembly, used to connect to oxygen supply devices; A gas delivery component that is connected to the oxygen supply component and the air inlet; The safety valve according to any one of claims 1-15, wherein the gas inlet is connected to the gas transmission assembly to output the gas formed by mixing air and oxygen through the gas output channel.

17. The medical ventilator according to claim 16, characterized in that, When the medical ventilator is in a ventilation state where the airway pressure is lower than the set pressure, the exhaust channel between the exhaust port and the gas output channel is not connected; when the airway pressure reaches the set pressure, the exhaust channel between the exhaust port and the gas output channel is connected.

18. The medical ventilator according to claim 16 or 17, characterized in that, The medical ventilator also includes a controller, which is signal-connected to the drive unit to control the start and stop of the drive unit.

19. The medical ventilator according to claim 18, characterized in that, When the medical ventilator is in a ventilation state where the airway pressure is lower than the set pressure, the controller controls the drive component to remain stationary; when the airway pressure reaches the set pressure, the controller controls the drive component to move.

20. The medical ventilator according to claim 18, characterized in that, The medical ventilator also includes a pressure monitoring module connected to the controller. The pressure monitoring module is connected to the safety valve to monitor the airway pressure and send the pressure monitoring results to the controller. The controller compares the pressure monitoring results with the set pressure and triggers start-stop control of the drive unit based on the comparison results.

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