An external expiratory valve and an emergency ventilator

Abstract

This utility model relates to the field of medical equipment, and more particularly to an external expiratory valve and an emergency ventilator. An external expiratory valve includes a valve seat, a valve disc, and a flow acquisition device. The valve seat has an inspiratory flow channel and an expiratory flow channel. The inspiratory flow channel has a first inspiratory port and a second inspiratory port. The first inspiratory port is suitable for connecting to the inspiratory inlet of the ventilator body, and the second inspiratory port is suitable for connecting to an inspiratory tubing. The expiratory flow channel has an expiratory tubing port and an expiratory outlet. The expiratory tubing port is suitable for connecting to an expiratory tubing. The valve disc and the flow acquisition device are installed within the expiratory flow channel. A valve port is provided within the expiratory flow channel. The valve disc is used to block or open the valve port. When the valve port is open, it connects the expiratory tubing port and the expiratory outlet. An emergency ventilator equipped with this external expiratory valve can connect to dual tubing and has basic inspiratory and expiratory functions. After the emergency ventilator is transferred to an in-hospital ventilator, there is no need to change the tubing, improving emergency efficiency and saving tubing replacement costs.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment, and in particular to an external exhalation valve and an emergency ventilator. Background Technology

[0002] An emergency ventilator is a portable respiratory support device designed specifically for emergency medical transport scenarios. It is mainly used to maintain or support the respiratory function of patients during transport (such as pre-hospital emergency care, inter-hospital referrals, disaster relief, etc.), ensuring that patients can still receive effective oxygen supply and ventilation support while on the move.

[0003] Existing emergency ventilators have a single-tube outlet. The patient inhales through the tube and exhales through the exhaust port at the end of the tube or through the expiratory valve inside the ventilator. However, hospital ventilators are typically equipped with dual-tube breathing systems. The patient inhales through one tube and exhales through the other tube, which is then expelled through the internal expiratory valve. Therefore, when a patient is transferred to the hospital, medical staff need to replace the breathing tube with a dual-tube one, which takes up valuable time and is costly. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in the case of existing emergency ventilators, after the patient is transferred to the hospital, medical staff need to replace the patient's breathing tube with a dual-tube one, which takes up the patient's emergency time. This utility model provides an external exhalation valve and an emergency ventilator.

[0005] To address the aforementioned problems, this utility model provides an external expiratory valve, comprising a valve seat, a valve disc, and a flow acquisition element. The valve seat is provided with an inspiratory flow channel and an expiratory flow channel. The inspiratory flow channel has a first inspiratory port and a second inspiratory port. The first inspiratory port is adapted to connect to the inspiratory port of the ventilator body, and the second inspiratory port is adapted to connect to the inspiratory tubing. The expiratory flow channel has an expiratory tubing interface and an expiratory outlet. The expiratory tubing interface is adapted to connect to the expiratory tubing. The valve disc and flow acquisition device are installed in the exhalation airway. A valve port is provided in the exhalation airway. The valve disc is used to block or open the valve port. When the valve port is open, the valve port connects the exhalation pipeline interface and the exhalation outlet.

[0006] Optionally, the flow acquisition device includes a diaphragm, through which the gas introduced into the exhalation tubing flows to the exhalation outlet; The ventilator body is provided with a proximal acquisition interface and a distal acquisition interface. The valve seat is provided with a proximal acquisition airway and a distal acquisition airway. The proximal acquisition airway is located on the side of the diaphragm closer to the expiratory tubing interface, and the distal acquisition airway is located on the side of the diaphragm away from the expiratory tubing interface. The proximal acquisition airway connects the expiratory airway to the proximal acquisition interface, and the proximal acquisition interface is used to acquire the pressure of the proximal acquisition airway. The distal acquisition airway connects the expiratory airway to the distal acquisition interface, and the distal acquisition interface is used to acquire the pressure of the distal acquisition airway.

[0007] Optionally, the valve seat includes a valve body and a front shell. The front shell is fixed to the front side of the valve body along a first direction. The front side of the valve body is provided with a mounting groove that opens forward. The rear side of the front shell is provided with a pressing ring platform, which presses the diaphragm into the mounting groove. The exhalation outlet, valve port, and distal air collection channel are disposed on the valve body, and the exhalation tubing interface is disposed on the front shell. The valve body and the front shell together form the proximal air collection channel; wherein, the first direction is the centerline direction of the exhalation tubing interface.

[0008] Optionally, a connecting column protruding toward the valve body is provided on the rear side of the front shell. The connecting column extends along the first direction. A first air distribution channel extending along the second direction is provided inside the front shell. A second air distribution channel penetrating along the first direction is provided inside the valve body. The connecting column is inserted into the second air distribution channel from the bottom opening of the second air distribution channel. The connecting column connects the first air distribution channel and the second air distribution channel to form the proximal collection air channel. The first direction is perpendicular to the second direction.

[0009] Optionally, the front shell includes an interface portion and a front strip plate, the exhalation tubing interface is disposed on the interface portion, the interface portion is a column extending along the first direction, the front strip plate extends along the second direction, the first air distribution channel is disposed on the front strip plate, and the connecting tube is formed on the side of the front strip plate facing the valve body.

[0010] Optionally, the valve body includes an inhalation seat, an exhalation seat, and a rear plate, the rear plate extending along the second direction, one end of the rear plate being connected to the outer wall of the exhalation seat, and the inhalation seat being connected to the exhalation seat; The inhalation airway is located on the inhalation seat, the exhalation airway is located on the exhalation seat, and the rear strip is provided with the distal collection airway and the second branch airway.

[0011] Optionally, the valve port and the exhalation tubing interface are coaxially distributed, the inhalation seat extends along the first direction, and the exhalation outlet penetrates the side wall of the exhalation seat along a third direction; the third direction is perpendicular to the first direction and the second direction, and the inhalation seat is located within the angle range between the exhalation outlet and the rear strip.

[0012] Optionally, the valve seat is provided with a positive pressure interface, the positive pressure interface and the expiratory tubing interface are located on opposite sides of the valve disc, and the positive pressure interface is adapted to be connected to the PEEP interface on the ventilator body.

[0013] Optionally, the valve seat has an interface end and a valve port end disposed opposite to each other along the first direction, the exhalation tubing interface is disposed at the interface end, and the valve port is disposed at the valve port end; The valve port end is equipped with a cap and a pressure shell. The cap is detachably connected to the valve port end. The cap is provided with a clearance opening. The pressure shell includes an air nozzle and a crimping part surrounding the air nozzle. The air nozzle is provided with the positive pressure interface. The cap presses the crimping part onto the valve disc. The air nozzle extends outward through the clearance opening.

[0014] On the other hand, this utility model embodiment provides an emergency ventilator, including a ventilator body and the aforementioned external expiratory valve, wherein the ventilator body is provided with an inhalation port.

[0015] This utility model provides an emergency ventilator with an external expiratory valve containing an inspiratory and expiratory flow path. The first inspiratory port of the inspiratory flow path connects to the inspiratory port of the ventilator body, and the second inspiratory port connects to the inspiratory tubing, allowing the air source within the ventilator body to deliver gas to the patient via the inspiratory flow path and tubing. Simultaneously, the expiratory flow path's expiratory tubing port connects to the expiratory tubing. The expiratory flow path contains a flow acquisition device and a valve. When the valve opens, the expiratory outlet and the expiratory tubing port connect, allowing the patient's exhaled gas to be delivered through the expiratory tubing and then expelled through the expiratory valve's expiratory port. Therefore, the emergency ventilator equipped with this external expiratory valve can connect to dual tubing and has basic inspiratory and expiratory functions. Consequently, when the emergency ventilator is transferred to an in-hospital ventilator, there is no need to change the tubing, saving preparation time, improving emergency response efficiency, and reducing tubing replacement costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an emergency ventilator provided in one embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the main body of the ventilator; Figure 3 for Figure 1 A schematic diagram of the structure of an external exhalation valve; Figure 4 for Figure 3 Another perspective; Figure 5 for Figure 4 Cross-sectional view; Figure 6 for Figure 4 Another cross-sectional view.

[0018] The reference numerals in the accompanying drawings are as follows: 1. Valve seat; 11. Inspiratory flow path; 111. First inspiratory port; 112. Second inspiratory port; 113. Valve port; 12. Expiration flow path; 121. Expiration tubing port; 122. Expiration outlet; 13. Proximal sampling channel; 14. Distal sampling channel; 15. Valve body; 151. Mounting groove; 152. Inspiratory seat; 153. Expiration seat; 154. Rear plate; 16. Front shell; 161. Pressing ring; 162. Connecting tubing; 163. Interface section; 164. Front plate; 17. Positive pressure port; 18. Cap; 19. Press shell; 191. Pressing part; 192. Nozzle section; 2. Valve disc; 3. Diaphragm; 4. Ventilator body; 41. Inspiratory port; 42. Proximal data acquisition interface; 43. Remote data acquisition interface; 44. PEEP interface. Detailed Implementation

[0019] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] Existing single-circuit ventilators use only one ventilation tube to connect the ventilator and the patient (such as a mask or endotracheal tube), with both inhalation and exhalation sharing the same tube. When the patient inhales, the ventilator delivers gas to the patient's lungs through the single tube; when the patient exhales, the exhaled gas returns to the ventilator through the same tube and is expelled from the body through the expiratory valve inside the ventilator.

[0021] The breathing tubing used in hospital ventilators is basically a dual-tube system. The patient inhales through one tube and exhales through the other tube into the ventilator, where it is then expelled through an internal exhalation valve. Therefore, when a patient is transferred to the hospital, medical staff need to replace the dual-tube breathing tubing with a new one, which takes up the patient's emergency time and wastes resources.

[0022] To address the aforementioned problems, one embodiment of this utility model provides an emergency ventilator, such as... Figures 1 to 3As shown, it includes a ventilator body 4 and an external expiratory valve, and the ventilator body is provided with an inhalation port 41.

[0023] like Figure 4 and Figure 5 As shown, the external expiratory valve includes a valve seat 1, a valve disc 2, and a flow acquisition element. The valve seat 1 is provided with an inspiratory flow channel 11 and an expiratory flow channel 12. The inspiratory flow channel 11 has a first inspiratory port 111 and a second inspiratory port 112. The first inspiratory port 111 is connected to the inspiratory inlet 41 of the ventilator body 4, and the second inspiratory port 112 is adapted to connect to an inspiratory tubing used to deliver oxygen from the ventilator body 4 to the patient. The expiratory flow channel 12 has an expiratory tubing inlet 121 and an expiratory outlet 122. The expiratory tubing inlet 121 is adapted to connect to an expiratory tubing used to deliver exhaled gas from the patient to the expiratory flow channel 12.

[0024] The valve disc 2 and the flow acquisition device are installed in the exhalation channel 12. The flow acquisition device is used to collect the flow in the exhalation channel 12. The exhalation channel 12 is provided with a valve port 113. The valve disc 2 is used to block or open the valve port 113. When the valve port 113 is open, the valve port 113 connects the exhalation pipeline interface 121 and the exhalation outlet 122.

[0025] Understandably, valve disc 2 is made of medical-grade silicone, which has a certain degree of elasticity and flexibility.

[0026] Specifically, the ventilator body 4 with an inspiratory port 41 is a common single-tube ventilator. In order to enable the single-tube ventilator to connect to dual tubes, an inspiratory flow channel 11 and an expiratory flow channel 12 are provided in the external expiratory valve. The first inspiratory port 111 of the inspiratory flow channel 11 can be connected to the inspiratory port 41 of the ventilator body 4, and the second inspiratory port 112 of the inspiratory flow channel 11 can be connected to the inspiratory tubing, so that the gas source in the ventilator body 4 can deliver gas to the patient through the inspiratory flow channel 11 and the inspiratory tubing. Meanwhile, the expiratory tubing interface 121 of the expiratory airway 12 can be connected to the expiratory tubing. The expiratory airway 12 is equipped with a flow acquisition device and a valve 2. When the valve 2 opens the valve port 113, the expiratory outlet 122 and the expiratory tubing interface 121 are connected. The gas exhaled by the patient can be discharged outward through the expiratory port of the expiratory valve after being transported through the expiratory tubing. Thus, the emergency ventilator equipped with this external expiratory valve can be connected to dual tubing and has the basic functions of inhalation and exhalation. Therefore, after the emergency ventilator is transferred to an in-hospital ventilator, there is no need to change the tubing, saving preparation time, improving emergency efficiency, and saving tubing replacement costs.

[0027] In one embodiment, such as Figure 5 As shown, the flow acquisition device includes a diaphragm 3, and the gas introduced through the exhalation tubing interface 121 flows through the diaphragm 3 to the exhalation outlet 122.

[0028] The ventilator body 4 is provided with a proximal acquisition interface 42 and a distal acquisition interface 43. The valve seat 1 is provided with a proximal acquisition airway 13 and a distal acquisition airway 14. The proximal acquisition airway 13 is located on the side of the diaphragm 3 close to the expiratory tubing interface 121, and the distal acquisition airway 14 is located on the side of the diaphragm 3 away from the expiratory tubing interface 121.

[0029] The proximal acquisition airway 13 connects the expiratory airway 12 and the proximal acquisition interface 42. The proximal acquisition interface 42 is used to acquire the pressure of the proximal acquisition airway 13. The distal acquisition airway 14 connects the expiratory airway 12 and the distal acquisition interface 43. The distal acquisition interface 43 is used to acquire the pressure of the distal acquisition airway 14.

[0030] It is understandable that pressure sensor probes are installed inside the ventilator body 4 at the proximal acquisition interface 42 and the distal acquisition interface 43 to detect the gas pressure in the corresponding acquisition airway.

[0031] Specifically, the exhaled air from the patient flows from the expiratory tubing interface 121 through the diaphragm 3 to the valve port 113. When the exhaled air passes through the diaphragm 3, the gas pressure at the rear end of the diaphragm 3 decreases, thereby enabling real-time monitoring of the flow rate of the expiratory airway 12 by detecting the pressure values ​​on opposite sides of the diaphragm 3.

[0032] In other embodiments, the flow acquisition device may be an electromagnetic flow meter, which is installed in the expiratory airway 12.

[0033] In one embodiment, such as Figures 3 to 5 As shown, the valve seat 1 includes a valve body 15 and a front shell 16. The front shell 16 is fixed to the front side of the valve body 15 along the first direction. The front side of the valve body 15 is provided with a mounting groove 151 that opens forward. The rear side of the front shell 16 is provided with a pressing ring 161, which presses the diaphragm 3 into the mounting groove 151.

[0034] An exhalation outlet 122, a valve port 113, and a distal airway 14 are disposed on the valve body 15, and an exhalation tubing interface 121 is disposed on the front housing 16. The valve body 15 and the front housing 16 together form the proximal airway 13; wherein, the first direction is the centerline direction of the exhalation tubing interface 121. Figure 5 In this context, D1 represents the first direction.

[0035] The diaphragm 3 is pressed against the mating surface of the valve body 15 and the front shell 16, which can ensure the stability of the diaphragm 3. Furthermore, the separate design and processing of the valve body 15 and the front shell 16 facilitates the installation of the diaphragm 3 when assembling an external exhalation valve.

[0036] In other embodiments, an installation port can be opened on the side wall of the valve seat 1, and a rotatable installation window can be connected to the valve seat 1. The installation window is used to close or open the installation port. When the installation port is open, the diaphragm 3 is inserted into the exhalation airway 12 through the installation port.

[0037] In one embodiment, such as Figures 3 to 5 As shown, a connecting column 162 protruding towards the valve body 15 is provided on the rear side of the front housing 16. A first air distribution channel extending along a second direction is provided inside the front housing 16. The connecting column 162 extends along the first direction. A second air distribution channel penetrating along the first direction is provided inside the valve body 15. The connecting column 162 is inserted into the second air distribution channel from its bottom opening. The connecting column 162 connects the first air distribution channel and the second air distribution channel to form a proximal collection air channel 13. The first direction is perpendicular to the second direction. Figure 5 In this context, D2 represents the second direction.

[0038] Compared to the direct connection between the first and second air ducts via an opening, connecting the first and second air ducts via a connecting tube 162 inserted into the second air duct can improve the airtightness of the connection between the first and second air ducts.

[0039] In one embodiment, such as Figure 4 and Figure 5 As shown, the front shell 16 includes an interface portion 163 and a front plate 164. An exhalation tubing interface 121 is disposed in the interface portion 163. The interface portion 163 is a column extending in a first direction. The front plate 164 extends in a second direction. A first air distribution channel is disposed in the front plate 164. A connecting tube 162 is formed on the side of the front plate 164 facing the valve body 15.

[0040] In one embodiment, the valve body 15 includes an inhalation seat 152, an exhalation seat 153, and a rear plate 154. The rear plate 154 extends along a second direction, and one end of the rear plate 154 is connected to the outer wall of the exhalation seat 153. The inhalation seat 152 is connected to the exhalation seat 153.

[0041] The inspiratory airway 11 is located in the inspiratory seat 152, the expiratory airway 12 is located in the expiratory seat 153, and the distal acquisition airway 14 and the second branch airway are located in the rear panel 154.

[0042] The shape of the inspiratory seat 152 is designed according to the inspiratory airway 11, the shape of the expiratory seat 153 is designed according to the expiratory airway 12, and the shape of the rear strip 154 ​​is designed according to the shapes of the proximal collection airway 13 and the distal collection airway 14, so as to rationally design the shape of the valve body 15 and reduce the volume of the valve body 15.

[0043] In one embodiment, such as Figure 3 , Figure 5 and Figure 6As shown, the valve port 113 and the exhalation tubing interface 121 are coaxially distributed. The inhalation seat 152 extends along the first direction, and the exhalation outlet 122 penetrates the side wall of the exhalation seat 153 along the third direction. The third direction is perpendicular to the first and second directions. Figure 3 and Figure 6 D3 in the figure represents the third direction. The inhalation seat 152 is located within the angle range between the exhalation outlet 122 and the rear plate 154, so that the exhalation outlet 122, the inhalation seat 152 and the rear plate 154 are circumferentially concentrated to further reduce the volume of the valve body 15.

[0044] In one embodiment, such as Figure 3 As shown, the third direction is the up-down direction when the emergency ventilator is in use. The exhalation outlet 122 has a downward opening so that the exhaled air can be discharged downwards. Since the exhaled air may carry blood or other substances, the downward opening of the exhalation outlet 122 helps the exhaled air to avoid being discharged from surrounding parts, thus preventing the exhaled air from contaminating the surrounding parts.

[0045] In one embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, valve seat 1 is provided with positive pressure interface 17. Positive pressure interface 17 and expiratory tubing interface 121 are located on opposite sides of valve disc 2. Positive pressure interface 17 is suitable for connecting to PEEP interface 44 on ventilator body 4.

[0046] The ventilator body 4 can introduce pressurized gas into the side of the valve disc 2 facing away from the expiratory tubing interface 121 through the positive pressure interface 17, so that the side of the valve disc 2 facing away from the expiratory tubing interface 121 has a certain pressure. Only when the pressure of the exhaled gas is greater than the pressure of the gas introduced through the positive pressure interface 17 can the valve disc 2 inflate to open the valve port 113, thereby creating resistance to the outflow of exhaled gas in the expiratory airway 12 and ensuring positive pressure at the end of the patient's exhalation.

[0047] In one embodiment, such as Figures 4 to 6 As shown, the valve seat 1 has an interface end and a valve port end that are arranged opposite to each other along a first direction. The exhalation pipeline interface 121 is disposed at the interface end, and the valve port 113 is disposed at the valve port end.

[0048] A cap 18 and a pressure shell 19 are installed at the valve port end. The cap 18 is detachably connected to the valve port end. The cap 18 is provided with a clearance opening. The pressure shell 19 includes an air nozzle 192 and a crimping part 191 surrounding the air nozzle 192. The air nozzle 192 is provided with a positive pressure port 17. The cap 18 presses the crimping part 191 onto the valve disc 2. The air nozzle 192 extends outward through the clearance opening.

[0049] The cap 18 can fix the pressure shell 19 and the valve disc 2 together at the valve port 113, saving the fixing structure. The cap 18 can be detachably fixed to the valve port end. After removing the cap 18, the valve disc 2 and the pressure shell 19 can be replaced, which is simple and convenient.

[0050] In one embodiment, such as Figure 5 As shown, a rotary groove is provided on the outer wall of the valve port end, and a screw buckle is provided on the inner wall of the cap 18. The screw buckle can be engaged in the rotary groove so that the cap 18 can be detachably fixed to the valve port end.

[0051] The buckle can be engaged in or disengaged from the groove by rotating the cap 18. The structure is simple and easy to assemble and disassemble.

[0052] In one embodiment, three swivel grooves are provided along the outer wall of the valve port end, and correspondingly, three swivel buckles are provided along the inner wall of the cap 18, with the three swivel grooves corresponding one-to-one with the three swivel buckles.

[0053] In addition, one embodiment of this utility model provides an external exhalation valve, the structure of which is the same as that of the external exhalation valve in any of the above embodiments, and will not be described again here.

[0054] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. An external exhalation valve characterized in that, Includes a valve seat (1), a valve disc (2), and a flow acquisition device. The valve seat (1) is provided with an inspiratory flow channel (11) and an expiratory flow channel (12). The inspiratory flow channel (11) has a first inspiratory port (111) and a second inspiratory port (112). The first inspiratory port (111) is adapted to connect to the inspiratory inlet (41) of the ventilator body (4), and the second inspiratory port (112) is adapted to connect to the inspiratory tubing. The expiratory flow channel (12) has an expiratory tubing interface (121) and an expiratory outlet (122). The expiratory tubing interface (121) is adapted to connect to the expiratory tubing. The valve disc (2) and the flow acquisition device are installed in the exhalation channel (12). A valve port (113) is provided in the exhalation channel (12). The valve disc (2) is used to block or open the valve port (113). When the valve port (113) is open, the valve port (113) connects the exhalation pipeline interface (121) and the exhalation outlet (122).

2. An external exhalation valve according to claim 1, characterized in that The flow acquisition device includes a diaphragm (3), and the gas introduced through the exhalation tubing interface (121) flows through the diaphragm (3) to the exhalation outlet (122). The ventilator body (4) is provided with a proximal acquisition interface (42) and a distal acquisition interface (43). The valve seat (1) is provided with a proximal acquisition airway (13) and a distal acquisition airway (14). The proximal acquisition airway (13) is located on the side of the diaphragm (3) close to the expiratory tubing interface (121), and the distal acquisition airway (14) is located on the side of the diaphragm (3) away from the expiratory tubing interface (121). The proximal acquisition airway (13) connects the expiratory airway (12) and the proximal acquisition interface (42). The proximal acquisition interface (42) is used to acquire the pressure of the proximal acquisition airway (13). The distal acquisition airway (14) connects the expiratory airway (12) and the distal acquisition interface (43). The distal acquisition interface (43) is used to acquire the pressure of the distal acquisition airway (14).

3. An external exhalation valve according to claim 2, wherein, The valve seat (1) includes a valve body (15) and a front shell (16). The front shell (16) is fixed to the front side of the valve body (15) along a first direction. The front side of the valve body (15) is provided with a mounting groove (151) that opens forward. The rear side of the front shell (16) is provided with a pressing ring (161). The pressing ring (161) presses the diaphragm (3) into the mounting groove (151). The exhalation outlet (122), valve port (113) and distal collection airway (14) are disposed on the valve body (15), and the exhalation tubing interface (121) is disposed on the front shell (16). The valve body (15) and the front shell (16) together form the proximal collection airway (13); wherein, the first direction is the centerline direction of the exhalation tubing interface (121).

4. An external exhalation valve according to claim 3, wherein, The front housing (16) is provided with a connecting column (162) protruding toward the valve body (15) on its rear side. The connecting column (162) extends along the first direction. The front housing (16) is provided with a first air distribution channel extending along the second direction. The valve body (15) is provided with a second air distribution channel penetrating along the first direction. The connecting column (162) is inserted into the second air distribution channel from the bottom opening of the second air distribution channel. The connecting column (162) connects the first air distribution channel and the second air distribution channel to form the proximal collection air channel (13). The first direction is perpendicular to the second direction.

5. An external exhalation valve according to claim 4, wherein, The front shell (16) includes an interface portion (163) and a front plate (164). The exhalation tubing interface (121) is disposed on the interface portion (163). The interface portion (163) is a column extending along the first direction. The front plate (164) extends along the second direction. The first air distribution channel is disposed on the front plate (164). The connecting tube (162) is formed on the side of the front plate (164) facing the valve body (15).

6. The external exhalation valve according to claim 4, characterized in that, The valve body (15) includes an inhalation seat (152), an exhalation seat (153) and a rear plate (154). The rear plate (154) extends along the second direction. One end of the rear plate (154) is connected to the outer wall of the exhalation seat (153). The inhalation seat (152) is connected to the exhalation seat (153). The inhalation airway (11) is provided on the inhalation seat (152), the exhalation airway (12) is provided on the exhalation seat (153), and the rear plate (154) is provided with the distal collection airway (14) and the second branch airway.

7. An external exhalation valve according to claim 6, wherein, The valve port (113) and the exhalation tubing interface (121) are coaxially distributed. The inhalation seat (152) extends along the first direction, and the exhalation outlet (122) penetrates the side wall of the exhalation seat (153) along a third direction. The third direction is perpendicular to the first direction and the second direction. The inhalation seat (152) is located within the angle range between the exhalation outlet (122) and the rear strip (154).

8. The external exhalation valve of claim 1, wherein, The valve seat (1) is provided with a positive pressure port (17), the positive pressure port (17) and the expiratory tubing port (121) are located on opposite sides of the valve disc (2), and the positive pressure port (17) is adapted to be connected to the PEEP port (44) on the ventilator body (4).

9. An external exhalation valve according to claim 8, wherein, The valve seat (1) has an interface end and a valve port end arranged opposite to each other along a first direction, the exhalation tubing interface (121) is disposed at the interface end, and the valve port (113) is disposed at the valve port end; The valve port end is equipped with a cap (18) and a pressure shell (19). The cap (18) is detachably connected to the valve port end. The cap (18) is provided with a clearance opening. The pressure shell (19) includes an air nozzle (192) and a crimping part (191) surrounding the air nozzle (192). The air nozzle (192) is provided with the positive pressure interface (17). The cap (18) presses the crimping part (191) onto the valve disc (2). The air nozzle (192) extends outward through the clearance opening.

10. A rescue ventilator, characterized by The device includes a ventilator body and an external expiratory valve as described in any one of claims 1 to 9, wherein the ventilator body is provided with an inhalation port (41).

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