Pneumatic control breathing machine

Abstract

The air control breathing machine comprises a main machine and a breathing mask, the main machine is communicated with an air source port and a communication port, the communication port is divided into a suction port, an expiration port, an inspiration port, an atomization port and an exhaust port, the suction port is communicated with a liquid collection bottle, the expiration port is communicated with the breathing mask, and a humidification tank is communicated between the inspiration port and the breathing mask. An atomizing cup is communicated between the atomizing opening and the breathing mask; compressed air or medical oxygen is used as power, a pneumatic control mechanism is used for working, a power source is not needed, and the device can be used under the power-source-free conditions such as emergency treatment, transfer and field. The breathing machine has the functions of intermittent mechanical ventilation IPPV of the breathing machine, synchronous intermittent instruction ventilation SIMV, positive airway pressure ventilation CPAP, positive end expiratory pressure PEEP, airway inspiration negative pressure triggering, airway expiration positive pressure protection, airway atomization humidification, suction, air and oxygen mixing and manual ventilation, can be used in normal pressure departments, can reach 0.3 MPa in a hyperbaric oxygen chamber, can reach 0.3 MPa in a hyperbaric oxygen chamber, can reach 0.3 MPa in a hyperbaric oxygen chamber, can reach 0.3 MPa in a hyperbaric oxygen chamber, can reach 0.3 MPa in a hyperbaric oxygen chamber, can reach 0.3 MPa in a hyperbaric oxygen chamber, can reach 0.3 MPa in a hyperbaric oxygen chamber, can reach 0.3 MPa in a hyperbaric oxygen chamber, can reach 0.3 MPa and long-time stable and reliable use can be realized.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic and air-controlled ventilators for medical devices, and in particular to an air-controlled ventilator. Background Technology

[0002] Ventilators, as a means of human ventilation, are widely used in clinical practice. They are essential medical equipment for the treatment of respiratory failure, respiratory management during surgery, emergency resuscitation, lung rehabilitation training, hyperbaric oxygen therapy, and ICU treatment.

[0003] With the development of hyperbaric oxygen chamber technology, the demand for ventilators to be used in the chamber is also increasing. Existing electronically controlled ventilators pose a high risk when used in hyperbaric oxygen chambers. If they are brought into the hyperbaric oxygen chamber, there is a risk of fire or explosion, so they are not suitable for use in the chamber. In addition, the pressure sensors of electronically controlled ventilators may change their parameters under high pressure, which may cause discomfort to the user and poor treatment effect.

[0004] Therefore, a pneumatically controlled ventilator is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a pneumatically controlled ventilator to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] A pneumatic ventilator, comprising:

[0008] The unit consists of a main unit and a breathing mask. The main unit is connected to an air source port and a connecting port. The connecting port is divided into an suction port, an exhalation port, an inhalation port, a nebulizer port, and an exhaust port. The suction port is connected to a collection bottle. The exhalation port is connected to the breathing mask. A humidification tank is connected between the inhalation port and the breathing mask. A nebulizer cup is connected between the nebulizer port and the breathing mask. The exhaust port is divided into an exhalation exhaust port and a controlled inhalation exhaust port. The exhalation exhaust port and the controlled inhalation exhaust port are respectively connected to the oxygen exhaust interface on the inner wall of the hyperbaric oxygen chamber.

[0009] The host is equipped with a pneumatic air control mechanism, which includes a simulated human breathing frequency adjustment mechanism, an air volume adjustment mechanism, and an airway pressure protection mechanism. The air volume adjustment mechanism is connected to the simulated human breathing frequency adjustment mechanism, and the airway pressure protection mechanism is connected to the air volume adjustment mechanism.

[0010] As a preferred technical solution, the simulated human breathing frequency adjustment mechanism includes an air source, a pressure reducing valve a, a pressure reducing valve b, a breathing switch, a frequency valve, a two-position five-way valve a, an air container a, an air container b, a logic element a, a logic element b, a two-position five-way valve b, and a two-position three-way valve. The air source, pressure reducing valve b, and two-position three-way valve are connected in series. The D port of the two-position five-way valve b is connected to the two-position three-way valve. The A port of the two-position five-way valve b is connected to the logic element a. The B port of the two-position five-way valve b is connected to the logic element b. The logic element a is connected to the two-position five-way valve a through the air container a. The logic element b is connected to the two-position five-way valve a through the air container b. The D port of the two-position five-way valve a, the frequency valve, the breathing switch, and the pressure reducing valve a are connected in series. The pressure reducing valve a is connected to the air source. The air source is connected to the air source port.

[0011] As a preferred technical solution, the A port of the two-position five-way valve a and the two-position three-way valve are both connected to the C port of the two-position five-way valve b, the B port of the two-position five-way valve a and the two-position three-way valve are both connected to the F port of the two-position five-way valve b, the C port of the two-position five-way valve a is connected to the gas container a, and the E port of the two-position five-way valve a is connected to the gas container b.

[0012] As a preferred technical solution, both logic element a and logic element b are connected to the pipeline between the breathing switch and the frequency valve, and logic element b is connected to the breathing switch.

[0013] As a preferred technical solution, the gas volume regulating mechanism includes a flow valve, which is connected to a two-position three-way valve.

[0014] As a preferred technical solution, the airway pressure protection mechanism includes a kPa gauge, a combination valve, an exhalation port, an inhalation port, and an exhaust port. The exhalation port, inhalation port, and exhaust port are respectively connected to a flow valve through the combination valve. The kPa gauge is connected to the combination valve. The exhalation port, inhalation port, and exhaust port are respectively connected to the exhalation port, inhalation port, and exhaust port.

[0015] As a preferred technical solution, the combined valve includes a negative pressure safety valve, a positive pressure safety valve, and a breathing valve. The negative pressure safety valve, the positive pressure safety valve, and the breathing valve are all connected to the flow valve. The kPa gauge is connected to the negative pressure safety valve. The exhalation port, the inhalation port, and the exhaust port are all connected to the breathing valve.

[0016] As a preferred technical solution, the flow rate adjustment range of the frequency valve is 1 mL / min to 500 mL / min, that is, the respiratory rate adjustment range is 1 breath / min to 100 breaths / min.

[0017] As a preferred technical solution, the volume range of gas containers a and b is 1mL to 40mL, that is, the inhalation-exhalation ratio is adjusted to 30:1 to 1:30.

[0018] As a preferred technical solution, the air flow rate adjustment range of the flow valve is 1L / min to 30L / min.

[0019] This utility model has at least the following beneficial effects:

[0020] The beneficial effects of this utility model are that it uses compressed air or medical oxygen as power and operates with a pneumatic control mechanism, requiring no power supply. It can be used in emergency situations, transportation, and field operations where there is no power supply. It has the functions of intermittent mechanical ventilation (IPPV), synchronized intermittent mandatory ventilation (SIMV), positive airway pressure (CPAP), positive end-expiratory pressure (PEEP), airway inspiratory negative pressure triggering, airway expiratory positive pressure protection, airway nebulization and humidification, suction, air-oxygen mixing, and manual ventilation. It can be used not only in normal pressure departments but also in hyperbaric oxygen chambers at pressures up to 0.3 MPa. It can also be used stably and reliably for extended periods at altitudes of 4000M to 8000M. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a pneumatically controlled ventilator according to the present invention;

[0022] Figure 2 This is a schematic diagram of the connection structure between the main unit of the pneumatic ventilator and the oxygen chamber according to the present invention.

[0023] Figure 3 This is a schematic diagram of the internal airway structure of the main unit of the pneumatic ventilator according to the present invention.

[0024] In the diagram: 100, Main unit; 101, Air source; 102, Pressure reducing valve a; 103, Pressure reducing valve b; 104, Breathing switch; 105, Frequency valve; 106, Two-position five-way valve a; 107, Air container a; 108, Air container b; 109, Logic element a; 110, Logic element b; 111, Two-position five-way valve b; 112, Two-position three-way valve; 113, KPa gauge; 114, Negative pressure safety valve; 115, Combination valve; 116, Flow valve; 117, Positive pressure safety valve; 118, Exhalation port; 119, Inhalation port; 120, Exhaust port; 121, Breathing valve; 200, Breathing mask; 300, Air source port; 400, Connecting port; 500, Collection bottle; 600, Humidifier; 700, Nebulizer cup. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-3 This utility model provides an air-controlled ventilator, including: a main unit 100 and a breathing mask 200. The main unit 100 is connected to an air source port 300 and a connecting port 400. The connecting port 400 is divided into a suction port, an exhalation port, an inhalation port, a nebulization port, and an exhaust port. The suction port is connected to a collection bottle 500. The exhalation port is connected to the breathing mask 200. The inhalation port is connected to the breathing mask 200 through a humidification tank 600. The nebulization port is connected to the breathing mask 200 through a nebulization cup 700. The exhaust port is divided into an exhalation exhaust port and a controlled inhalation exhaust port. The exhalation exhaust port and the controlled inhalation exhaust port are respectively connected to the oxygen exhaust interface on the inner wall of the hyperbaric oxygen chamber.

[0027] The control air source used in this device is provided by air source port 300. It does not require power. Medical compressed air or medical pure oxygen is used as the air source. The working pressure is 0.4MPa to 0.7MPa. When the pressure in the oxygen chamber increases by 0.1MPa, since the whole machine is used in the oxygen chamber, the relative pressure decreases from 0.4MPa to 0.7MPa to 0.3MPa to 0.6MPa. It still meets the minimum working pressure of 0.25MPa for ventilators, so it is suitable for working in a hyperbaric oxygen chamber.

[0028] The main unit 100 is equipped with a pneumatic air control mechanism, which includes a simulated human breathing frequency adjustment mechanism, an air volume adjustment mechanism, and an airway pressure protection mechanism. The air volume adjustment mechanism is connected to the simulated human breathing frequency adjustment mechanism, and the airway pressure protection mechanism is connected to the air volume adjustment mechanism.

[0029] The simulated human breathing frequency regulation mechanism includes an air source 101, a pressure reducing valve a102, a pressure reducing valve b103, a breathing switch 104, a frequency valve 105, a two-position five-way valve a106, an air container a107, an air container b108, a logic element a109, a logic element b110, a two-position five-way valve b111, and a two-position three-way valve 112. The air source 101, pressure reducing valve b103, and two-position three-way valve 112 are connected in series. Port D of the two-position five-way valve b111 is connected to the two-position three-way valve 112. Port A of 111 is connected to logic element a109, port B of two-position five-way valve b111 is connected to logic element b110, logic element a109 is connected to two-position five-way valve a106 through gas capacitor a107, logic element b110 is connected to two-position five-way valve a106 through gas capacitor b108, port D of two-position five-way valve a106, frequency valve 105, breathing switch 104 and pressure reducing valve a102 are connected in series, pressure reducing valve a102 is connected to air source 101, and air source 101 is connected to air source port 300.

[0030] Among them, port A of two-position five-way a106 and port C of two-position three-way 112 are connected to port C of two-position five-way b111, port B of two-position five-way a106 and port F of two-position three-way 112 are connected to port F of two-position five-way b111, port C of two-position five-way a106 is connected to gas container a107, and port E of two-position five-way a106 is connected to gas container b108.

[0031] Among them, logic element a109 and logic element b110 are both connected to the pipeline between breathing switch 104 and frequency valve 105, and logic element b110 is connected to breathing switch 104.

[0032] The principle of the host 100 in the power-off state: When the breathing switch 104 is closed, air is supplied to the logic element b110. The logic element b110 outputs to the B port of the two-position five-way valve b111. There is no air at the A port. At this time, the C port of the two-position five-way valve b111 is closed, and the F port of the two-position five-way valve b111 is opened. The output of the two-position three-way valve 112 is closed, and the E port of the two-position five-way valve a106 is connected to the air capacitor b108. The C port of the two-position five-way valve a106 is disconnected from the air capacitor a107. At this time, it is in the power-off state.

[0033] The principle of the main unit 100's inhalation state: When the breathing switch 104 is turned on, air is supplied to logic element a109, logic element b110, and frequency valve 105 simultaneously. At this time, the state of the two-position five-way valve b111 remains unchanged, but the frequency valve 105 is adjusted to supply different flow rates of gas to port D of the two-position five-way valve a106, first filling the gas container b108 with air; when the air pressure of the gas container b108 reaches the control pressure of logic element b110, the output of logic element b110 is turned off, causing port A of the two-position five-way valve b111 to have air and port B to be empty, thus switching the state. Port C of the two-position five-way valve b111 has air and port F to be empty, controlling port E of the two-position five-way valve a106 to disconnect from the gas container b108, and port C of the two-position five-way valve a106 to connect with the gas container a107, controlling the two-position three-way valve 112 to open the output, which is the beginning of the inhalation state;

[0034] The principle of the exhalation state of the main unit 100: Since the C port of the two-position five-way valve a106 is connected to the air container a107 and begins to inflate, the air container b108 is immediately deflated. At this time, the pressure of the air containers a107 and b108 is low, and neither can control the logic elements a109 and b110 to close the output, keeping the state of the two-position five-way valve b111 unchanged. However, as the pressure of the air container a107 slowly rises, when the air pressure of the air container a107 reaches the control pressure of the logic element a109, the output of the logic element a109 is closed, causing the B port of the two-position five-way valve b111 to have air and the A port to be empty, thus switching the state. The C port of the two-position five-way valve b111 is empty and the F port has air, controlling the E port of the two-position five-way valve a106 to connect with the air container b108, and the C port of the two-position five-way valve a106 to disconnect from the air container a107, controlling the output of the two-position three-way valve 112 to close. This is the beginning of the exhalation state.

[0035] Repeat the above inhalation and exhalation states to begin simulating the inhalation and exhalation states of human breathing, thus enabling pneumatic control to function.

[0036] The gas volume regulating mechanism includes a flow valve 116, which is connected to a two-position three-way valve 112.

[0037] The airway pressure protection mechanism includes a kPa gauge 113, a combination valve 115, an exhalation port 118, an inhalation port 119, and an exhaust port 120. The exhalation port 118, the inhalation port 119, and the exhaust port 120 are respectively connected to the flow valve 116 through the combination valve 115. The kPa gauge 113 is connected to the combination valve 115. The exhalation port 118, the inhalation port 119, and the exhaust port 120 are respectively connected to the exhalation port, the inhalation port, and the exhaust port.

[0038] The combination valve 115 includes a negative pressure safety valve 114, a positive pressure safety valve 117, and a breathing valve 121. The negative pressure safety valve 114, the positive pressure safety valve 117, and the breathing valve 121 are all connected to the flow valve 116. The kPa gauge 113 is connected to the negative pressure safety valve 114. The exhalation port 118, the inhalation port 119, and the exhaust port 120 are all connected to the breathing valve 121.

[0039] After the breathing switch 104 is turned on and the system begins operation, the flow rate can be adjusted by regulating the flow valve 116. When the gas reaches the combination valve 115, the pressure decreases from 0.25 MPa ± 30% to a suitable pressure of 0–6 kPa for simulating human ventilation. The kPa gauge 113 displays the human airway pressure. During simulated human use, when the airway pressure at the combination valve 115 exceeds the predetermined pressure of the positive pressure safety valve 117 (0.5–6 kPa), the positive pressure safety valve 117 begins to discharge air, protecting the airway pressure from falling below 0.5–6 kPa. When the airway pressure at the combination valve 115 is lower than the predetermined pressure of the negative pressure safety valve 114 (-0.1–-1 kPa), the negative pressure safety valve 114 begins to intake air, protecting the airway pressure from falling below -0.1–-1 kPa. This achieves the function of airway pressure protection.

[0040] The flow rate adjustment range of the frequency valve 105 is 1 mL / min to 500 mL / min, which means the respiratory rate adjustment range is 1 breath / min to 100 breaths / min.

[0041] Among them, the volume range of gas capacity a107 and gas capacity b108 is 1mL to 40mL, that is, the inhalation-exhalation ratio is adjusted to 30:1 to 1:30 to meet the human body's inhalation-exhalation ratio requirements.

[0042] The ventilation rate adjustment range of the flow valve 116 is 1L / min to 30L / min.

[0043] The main unit 100 includes the following breathing modes: IPPV mechanical ventilation and positive pressure triggering; IPPB negative pressure triggering; CPAP continuous positive airway pressure and on-demand inhalation; SIMV synchronized intermittent mandatory ventilation; negative pressure tubing connected to a collection bottle for suction function; manual ventilation control; nebulization and humidification functions; positive end-expiratory pressure (PEEP) function; positive and negative pressure sensor functions; and negative pressure trigger indicator and positive pressure indicator.

[0044] In order to cooperate with the operation of the above breathing mode, the main unit 100 is also equipped with sensors, positive pressure trigger light, negative pressure trigger light, CPAP switch, SIMV switch, and SIMV frequency valve. The sensors include positive pressure and negative pressure sensors.

[0045] The working principle of this utility model is as follows:

[0046] The core of the IPPV logic system is the back-and-forth switching between two-position five-way valve A106 and two-position five-way valve B111 to control whether two-position three-way valve 112 is open for air. A frequency valve 105 and air containers A107 and B108 are added to control the switching time. In addition, the frequency valve 105 limits the air flow to air containers A107 and B108, thereby controlling the rate of increase of their internal air pressure. When the internal air pressure of air containers A107 and B108 rises to a level that allows switching logic elements A109 and B110, logic elements A109 and B110 are closed, and two-position five-way valve A106 and two-position five-way valve B111 complete the switching, thereby realizing the switching between inhalation and exhalation.

[0047] The ventilator's airway initialization begins by opening the air source 101 and closing the breathing switch 104. Logic element b110 outputs air, allowing air to flow into port B of the two-position five-way valve b111. This prevents air output from the two-position three-way valve 112, causing port F of the two-position five-way valve b111 to output air while port C is closed. This also closes the two-position three-way valve 112, completing the initialization process and placing the system in a shutdown state. Simultaneously, when the air pressure at ports A and B of the two-position five-way valves a106 and b111 is equal or both zero, the two-position five-way valves a106 and b111 remain unchanged. When pressure reducing valves a102 and b103 connect to the air source, logic elements a109 and b110 receive input and begin outputting to the control terminals of ports A and B of the two-position five-way valve b111. Therefore, the two-position five-way valve b111 remains unchanged, keeping the system in a shutdown state.

[0048] The IPPB logic system is based on the IPPV logic system, adding sensors and a negative pressure trigger light. It can sense the patient's spontaneous breathing based on changes in airway pressure. When the ventilator is not delivering air, the airway pressure is generally "0" kPa. If the patient inhales, the airway pressure will decrease to a negative value. When the airway pressure reaches the negative value set by the trigger pressure, the sensor will start outputting to turn on the negative pressure trigger light, forcibly opening the output of logic element a109 and closing the output of logic element b110, causing port C of the two-position five-way valve b111 to output while port F is closed, and opening the two-position three-way valve 112 to start outputting, thereby enabling the ventilator to perform one mechanical ventilation. When the ventilator delivers air, the airway pressure rises, causing the sensor output pressure to return to normal, and the ventilator returns to normal operation.

[0049] Working principle of positive and negative pressure sensors: When the ventilator delivers air, the airway pressure generally rises slowly to a certain value, which depends on the ventilation volume and IPPV frequency. When the patient exhales, the airway pressure will rise further. When the airway pressure reaches the upper limit of the positive pressure setting, the sensor loses its control signal and starts outputting, directly turning on the positive pressure trigger light, forcibly opening logic element b110, closing logic element a109, causing the two-position five-way valve b111 to switch to port F output, and forcibly closing the two-position three-way valve 112 to stop output, thereby stopping the ventilator from delivering air and realizing the positive pressure protection function. When the patient inhales, the ventilator's airway pressure will become negative. When the airway pressure reaches -0.1 kPa, it will trigger the opening of port C of the two-position five-way valve b111, opening the two-position three-way valve 112 to deliver air, increasing the airflow and raising the pressure to meet the patient's breathing requirements.

[0050] CPAP working principle: When both breathing switch 104 and CPAP switch are open, the ventilator enters the CPAP breathing mode. The SIMV switch is closed, and logic element a109 has no control signal. At this time, logic element b110 continues to output, closing the output of the two-position three-way valve 112. In CPAP breathing mode, the F port of the two-position five-way valve b111 outputs, thus shutting down the IPPB system.

[0051] Working principle of two-position five-way valves A106 and B111: Ports A and B of both valves are control ports, and ports C, E, and F are output ports. When the air pressure at ports A and B is equal, the valve maintains output. Only when there is air at port A and no air at port B does port C output, and ports E and F close. When there is no air at port A and air at port B, port C closes, and ports E and F output.

[0052] SIMV Working Principle: Its output is sent to air containers a107 and b108 through the SIMV frequency valve, and then the output of logic element b110 is delayed to achieve an inspiratory-to-expiratory ratio of 1:30. Specifically, the C port of the two-position five-way valve a106 outputs, which gives logic element a109 input and causes it to start outputting, thus turning off logic element a109. At the same time, the two-position three-way valve 112 starts outputting and turns off. At this time, the ventilator is in the inspiratory phase, and the on-demand function is disabled. When the two-position five-way valve b111 and the two-position five-way valve a106 switch states, the SIMV is in the expiratory phase.

[0053] Working principle of breathing valve 121: During inhalation, the control port of breathing valve 121 receives a pressure of 6-15 kPa provided by the non-adjustable pressure reducing valve, and the outlet of breathing valve 121 is closed, so that the airway is continuously filled with air without leakage. During exhalation, logic element a109 and logic element b110 switch to the pressure of PEEP valve 0-2 kPa output, thereby controlling the end-expiratory pressure of the airway to 0-2 kPa, so as to achieve the purpose of smooth exhalation.

[0054] The suction function of the respiratory system is directly connected after the pressure reducing valve b103. The pressure is fixed at 0.25MPa. The suction switch of the collection bottle 500 is opened. The flow rate is controlled by adjusting the suction adjustment knob, so that the vacuum valve controls the suction force according to the flow rate of the input gas. The waste gas generated in this process will be discharged to the outside of the ventilator through the exhaust port 120.

[0055] The nebulization and humidification functions of the respiratory actuator are connected between the inlet of the flow valve 116 and the two-position three-way valve 112. Its function is to deliver a small airflow from the nebulizer port when the ventilator is working. The flow rate of the delivered gas is controlled by adjusting the nebulization adjustment knob, and the nebulization and humidification functions are realized through the nebulizer cup 700.

[0056] The manual breathing mode is directly connected to the pressure reducing valve b103. First, adjust the manual adjustment knob to control the flow rate of the delivered gas. Press the manual switch button, and the gas will pass through the combination valve 115 and be output from the inhalation port 119. In manual mode, the breathing switch 104 must be turned off.

[0057] The airway pressure display function uses a -2 to 10 kPa gauge 113 connected to the combination valve 115 to display the airway pressure. The combination valve 115 has a negative pressure safety valve 114 and a positive pressure safety valve 117.

[0058] The air-oxygen mixing function allows for flow rate adjustment via flow valve 116 and oxygen concentration adjustment via the air-oxygen mixing valve when the two-position three-way valve 112 starts supplying air. The air-oxygen mixing valve is a combination of a two-position three-way valve and a vacuum valve. The upper two-position three-way valve operates on the same principle as the two-position three-way valve 112, with one side unused and the other connected to flow valve 116. The control interface is connected to the air-oxygen switch. After receiving input from flow valve 116, the lower vacuum valve controls the input of 100% pure oxygen and 60% oxygen via the two-position three-way valve, which is then delivered to the breathing tubing outside the ventilator, i.e., into the patient's airway, via the combination valve 115.

[0059] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatically controlled ventilator, characterized in that, include: The host (100) and the breathing mask (200) are connected to an air source port (300) and a connecting port (400). The connecting port (400) is divided into a suction port, an exhalation port, an inhalation port, a nebulizer port and an exhaust port. The suction port is connected to a collection bottle (500). The exhalation port is connected to the breathing mask (200). The inhalation port is connected to the breathing mask (200) and a humidification tank (600). The nebulizer port is connected to the breathing mask (200) and a nebulizer cup (700). The exhaust port is divided into an exhalation exhaust port and a controlled inhalation exhaust port. The exhalation exhaust port and the controlled inhalation exhaust port are respectively connected to the oxygen exhaust interface on the inner wall of the hyperbaric oxygen chamber. The host (100) is equipped with a pneumatic air control mechanism, which includes a simulated human breathing frequency adjustment mechanism, an air volume adjustment mechanism, and an airway pressure protection mechanism. The air volume adjustment mechanism is connected to the simulated human breathing frequency adjustment mechanism, and the airway pressure protection mechanism is connected to the air volume adjustment mechanism. The simulated human breathing frequency regulation mechanism includes an air source (101), pressure reducing valve a (102), pressure reducing valve b (103), breathing switch (104), frequency valve (105), two-position five-way valve a (106), air container a (107), air container b (108), logic element a (109), logic element b (110), two-position five-way valve b (111), and two-position three-way valve (112). The air source (101), pressure reducing valve b (103), and two-position three-way valve (112) are connected in series. Port D of two-position five-way valve b (111) is connected to two-position three-way valve (112). Port A of the two-position five-way valve is connected to logic element a (109). Port B of the two-position five-way valve b (111) is connected to logic element b (110). Logic element a (109) is connected to two-position five-way valve a (106) through gas capacitor a (107). Logic element b (110) is connected to two-position five-way valve a (106) through gas capacitor b (108). Port D of the two-position five-way valve a (106), frequency valve (105), breathing switch (104), and pressure reducing valve a (102) are connected in series. Pressure reducing valve a (102) is connected to air source (101). Air source (101) is connected to air source port (300).

2. The pneumatically controlled ventilator according to claim 1, characterized in that: Port A of the two-position five-way connector a (106) and port C of the two-position three-way connector (112) are connected to port C of the two-position five-way connector b (111). Port B of the two-position five-way connector a (106) and port F of the two-position three-way connector (112) are connected to port F of the two-position five-way connector b (111). Port C of the two-position five-way connector a (106) is connected to gas container a (107). Port E of the two-position five-way connector a (106) is connected to gas container b (108).

3. A pneumatically controlled ventilator according to claim 2, characterized in that: Both logic element a (109) and logic element b (110) are connected to the pipeline between the breathing switch (104) and the frequency valve (105), and logic element b (110) is connected to the breathing switch (104).

4. A pneumatically controlled ventilator according to claim 2, characterized in that: The gas volume regulating mechanism includes a flow valve (116), which is connected to a two-position three-way valve (112).

5. A pneumatically controlled ventilator according to claim 4, characterized in that: The airway pressure protection mechanism includes a kPa gauge (113), a combination valve (115), an exhalation port (118), an inhalation port (119), and an exhaust port (120). The exhalation port (118), the inhalation port (119), and the exhaust port (120) are respectively connected to a flow valve (116) through the combination valve (115). The kPa gauge (113) is connected to the combination valve (115). The exhalation port (118), the inhalation port (119), and the exhaust port (120) are respectively connected to the exhalation port, the inhalation port, and the exhaust port.

6. A pneumatically controlled ventilator according to claim 5, characterized in that: The combined valve (115) includes a negative pressure safety valve (114), a positive pressure safety valve (117), and a breathing valve (121). The negative pressure safety valve (114), the positive pressure safety valve (117), and the breathing valve (121) are all connected to the flow valve (116). The kPa gauge (113) is connected to the negative pressure safety valve (114). The exhalation port (118), the inhalation port (119), and the exhaust port (120) are all connected to the breathing valve (121).

7. A pneumatically controlled ventilator according to claim 6, characterized in that: The flow rate adjustment range of the frequency valve (105) is 1 mL / min to 500 mL / min, that is, the respiratory rate adjustment range is 1 breath / min to 100 breaths / min.

8. A pneumatically controlled ventilator according to claim 2, characterized in that: The volume range of gas capacity a (107) and gas capacity b (108) is 1 mL to 40 mL, that is, the inhalation-exhalation ratio is adjusted to 30:1 to 1:

30.

9. A pneumatically controlled ventilator according to claim 5, characterized in that: The air flow rate adjustment range of the flow valve (116) is 1L / min to 30L / min.

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