Anaesthesia machine

Abstract

The anesthesia machine comprises a gas supply system, a flow control system, an anesthetic gas conveying system and a loop system. The gas supply system comprises a laughing gas assembly used for providing laughing gas, an oxygen assembly used for providing oxygen and an air assembly used for providing air. The flow control system comprises a first flow control branch and a second flow control branch; the anesthetic gas conveying system comprises a bypass valve, an evaporator and an auxiliary fresh gas outlet switch and is used for generating and conveying anesthetic gas; the loop system comprises an inspiration branch, an expiration branch, a paramagnetic oxygen sensor, an anesthetic gas concentration detection assembly, a manual control change-over switch, an automatic assisted respiration branch, a manual assisted respiration branch and a heating assembly. According to the anesthesia machine, the arrangement space of gas source pressure monitoring is reduced, the risk of gas leakage is reduced, oxygen can be supplied when the anesthesia machine loses power, and the safety of the anesthesia machine is improved.

Description

Technical Field

[0001] This application relates to the field of anesthesia machine technology, specifically to an anesthesia machine. Background Technology

[0002] Anesthesia machines are medical devices used to control a patient's anesthetic state and maintain vital signs (respiratory support) during surgery. They primarily help to complete surgery safely and painlessly by precisely delivering anesthetic gases and oxygen.

[0003] The existing technical disadvantages of traditional anesthesia machines include: The gas pressure in traditional anesthesia machines is obtained through readings from mechanical pressure gauges, which have low accuracy; the high-pressure regulator in traditional anesthesia machines experiences a significant drop in output pressure as the output flow rate increases; most flow meters in traditional anesthesia machines are mechanical float-type, resulting in low flow output accuracy and the floats are prone to jumping; while some anesthesia machines have electrically controlled flow meters, they are bulky and prone to abnormal noise; the auxiliary oxygen supply flow rate in traditional anesthesia machines is generally below 15L / min, with a small maximum output flow rate that cannot meet clinical needs; traditional anesthesia machines typically only use oxygen as the driving gas, leading to high oxygen consumption and costs; and the outlet pressure of the driving gas pressure reducing valve in traditional anesthesia machines lacks a detection device, making it difficult to detect abnormal driving gas pressure output. Timely detection of issues leading to anesthesia machine malfunctions is crucial. For example, the IP valve in traditional anesthesia machines is prone to unusual noises in the gas path; traditional anesthesia machines typically use oxygen batteries for oxygen concentration detection, which are consumables with short lifespans; traditional anesthesia machines lack expiratory pressure monitoring, resulting in inaccurate PEEP values; the fresh gas inlet in traditional anesthesia machines is too far from the inspiratory check valve, causing a slow rise in anesthetic gas concentration; the tidal volume monitoring flow sensor in traditional anesthesia machines lacks automatic calibration, making manual calibration time-consuming and laborious; the machine-controlled absorption circuit of traditional anesthesia machines uses a folded bag, which is space-consuming and prone to leakage; and the inspiratory and expiratory flow sensors in traditional anesthesia machines lack zeroing functions, leading to inaccurate flow readings after a period of use. Summary of the Invention

[0004] The purpose of this application is to overcome the shortcomings of the prior art and to propose an anesthesia machine.

[0005] An anesthesia machine includes a gas supply system, a flow control system and a safety oxygen assembly connected to the gas supply system, and an anesthetic gas delivery system and a circuit system connected to the flow control system and the safety oxygen assembly. The gas supply system includes a nitrous oxide assembly for providing nitrous oxide, an oxygen assembly for providing oxygen, and an air assembly for providing air. Each of the nitrous oxide assembly, the oxygen assembly, and the air assembly is equipped with a pressure sensor and a high-pressure regulator. The flow control system includes a first flow control branch and a second flow control branch for supplying nitrous oxide and air, or nitrous oxide and oxygen, to the anesthetic gas delivery system after flow control when energized. One end of the safety oxygen component is connected to the oxygen component, and the other end is connected to the flow control system. It is used to control the oxygen flow when the anesthesia machine loses power. The safety oxygen component includes a safety oxygen changeover switch 50, a solenoid valve 21, a safety oxygen regulating valve 25, and a safety oxygen flow meter 20 connected to each other. The anesthetic gas delivery system includes a bypass valve 23, an vaporizer 24, and an auxiliary fresh gas outlet switch 36, which are used to generate and deliver anesthetic gas. The circuit system includes an inspiratory branch, an expiratory branch, a paramagnetic oxygen sensor 44, an anesthetic gas concentration detection component 43, a manual / mechanical control switch 35, an automatic assisted breathing branch, a manual assisted breathing branch, and a heating component 46. The circuit system is connected to the anesthetic gas delivery system through the inspiratory branch.

[0006] In some embodiments, the nitrous oxide assembly includes a first nitrous oxide branch, a second nitrous oxide branch, and a pressure reducing valve 12; the first nitrous oxide branch includes a connected nitrous oxide pipeline gas source 1, a filter 6, a low-pressure sensor 10, and a one-way valve 9; the second nitrous oxide branch includes a connected nitrous oxide high-pressure cylinder 2, a filter 6, a high-pressure sensor 8, a second high-pressure pressure reducer 11, and a one-way valve 9; the one-way valve 9 of the first nitrous oxide branch and the one-way valve 9 of the second nitrous oxide branch are both connected to the pressure reducing valve 12; The air assembly includes a connected air duct, an air source 3, a filter 6, a low-pressure sensor 10, a one-way valve 9, and a pressure reducing valve 12. The oxygen assembly includes a first oxygen branch, a second oxygen branch, and the pressure reducing valve 12; the first oxygen branch includes a connected oxygen pipeline gas source 4, the filter 6, the low-pressure sensor 10, and the one-way valve 9; the second oxygen branch includes a connected high-pressure oxygen cylinder 5, the filter 6, the second high-pressure sensor 8, the first high-pressure regulator 7, and the one-way valve 9; the one-way valve 9 of the first oxygen branch and the one-way valve 9 of the second oxygen branch are both connected to the pressure reducing valve 12.

[0007] In some embodiments, the first flow control branch is connected to the nitrous oxide assembly or the air assembly, and the second flow control branch is connected to the oxygen assembly; The first flow control branch includes a solenoid valve 15, a proportional valve 16, and an electronic flow meter 17, which are respectively connected to the nitrous oxide assembly and the air assembly, so as to connect the first flow control branch to the nitrous oxide assembly or the air assembly by controlling the opening and closing of the solenoid valve 15. The second flow control branch includes a solenoid valve 15, a proportional valve 16, and an electronic flow meter 17 connected to the oxygen assembly; In the first flow control branch and the second flow control branch, the air passage between the outlet of the solenoid valve 15 and the inlet of the proportional valve 16 is directly opposite, and the air passage outlet diameter of the solenoid valve 15 is larger than the air passage outlet diameter of the proportional valve 16.

[0008] In some embodiments, the bypass valve 23 is connected to the first flow control branch and the second flow control branch, respectively.

[0009] In some embodiments, the inhalation branch includes an inhalation pressure differential assembly 41, a first airway pressure sensor 47, a second airway pressure sensor 60, an inhalation one-way valve 38, and a soda lime container 37. One end of the inspiratory pressure differential assembly 41 is connected to the patient 42, and the other end is connected to one end of the inspiratory one-way valve 38. The first airway pressure sensor 47 and the second airway pressure sensor 60 are disposed between the inspiratory pressure differential assembly 41 and the inspiratory one-way valve 38. The other end of the inspiratory one-way valve 38 is connected to the auxiliary fresh gas outlet switch 36 and the other end is connected to one end of the soda lime container 37. The other end of the soda lime container 37 is connected to the automatic assisted breathing circuit and the manual assisted breathing circuit, respectively. The expiratory branch includes an expiratory pressure differential assembly 40, an expiratory pressure sensor 53, and an expiratory one-way valve 39; One end of the expiratory pressure differential assembly 40 is connected to the patient 42, and the other end is connected to the expiratory one-way valve 39. The expiratory pressure sensor 53 is disposed between the expiratory pressure differential assembly 40 and the expiratory one-way valve 39. The expiratory one-way valve 39 is connected to the automatic assisted breathing branch and the manual assisted breathing branch, respectively. The paramagnetic oxygen sensor 44 and the anesthetic gas concentration detection component 43 are respectively connected to the inspiratory branch and the expiratory branch.

[0010] In some embodiments, the inspiratory differential pressure assembly 41 includes a first solenoid valve 54, a second solenoid valve 55, and an inspiratory flow sensor 58; the expiratory differential pressure assembly 40 includes a third solenoid valve 56, a fourth solenoid valve 57, and an expiratory flow sensor 59.

[0011] In some embodiments, the automatic assisted breathing circuit includes a drive gas switching switch 13, a pressure reducing valve 26, a drive gas pressure sensor 52, a gas path module assembly, a gas resistance 29, an IP valve 30, an exhalation valve 32, a waste gas treatment device 48, and a coil 34, for automatic assisted breathing; The first end of the driving gas changeover switch 13 is connected to the oxygen assembly, the second end is placed in the air, and the third end is connected to one end of the pressure reducing valve 26; the other end of the pressure reducing valve 26 is connected to the first end of the gas path module assembly, the second end of the gas path module assembly is connected to one end of the gas resistance 29, and the third end is connected to the coil 34; the coil 34 is connected to the manual control changeover switch 35; the driving gas pressure sensor 52 is disposed between the pressure reducing valve 26 and the gas path module assembly; one end of the exhalation valve 32 is disposed between the gas path module assembly and the coil 34, and the other end is connected to the waste gas treatment device 48; the other end of the gas resistance 29 is connected to one end of the IP valve 30, and the other end of the IP valve 30 is placed in the air; The manual assisted breathing circuit includes a bag 45 for artificial assisted breathing.

[0012] In some embodiments, the pneumatic circuit module assembly includes an intake valve 28, a filter 6, a flow sensor 51, a safety valve 31, and a solenoid valve 27; one end of the intake valve 28 is connected to the pressure reducing valve 26, and the other end is connected to one end of the filter 6; the other end of the filter 6 is connected to one end of the flow sensor 51, and the other end of the flow sensor 51 is connected to the coil 34; the flow sensor 31 is disposed between the flow sensor 51 and the coil 34; one end of the solenoid valve 27 is connected to the pressure reducing valve 26, and the other end is connected to one end of the air resistance 29.

[0013] In some embodiments, an oxygen therapy component and a safety oxygen component are also included, the oxygen therapy component being connected to the oxygen component for providing auxiliary oxygen supply, the oxygen therapy component including a rotary flow regulating valve (19) and a 60L flow meter 18; One end of the safety oxygen component is connected to the oxygen component, and the other end is connected to the flow control system. It is used to control the oxygen flow when the anesthesia machine loses power. The safety oxygen component includes a safety oxygen changeover switch 50, a solenoid valve 21, a safety oxygen regulating valve 25, and a safety oxygen flow meter 20 connected to each other.

[0014] In some embodiments, a rapid oxygen supply component 22 is also included, one end of which is connected to the oxygen component and the other end of which is connected to the anesthetic gas delivery system, for diluting the concentration of anesthetic gas.

[0015] Compared with existing technologies, the advantages of this application are: (1) This application uses pressure sensors to sample and monitor the nitrous oxide assembly, air assembly and oxygen assembly, which reduces the layout space for gas source pressure monitoring, reduces the risk of gas leakage, and realizes the electronic monitoring of gas source pressure. (2) The high pressure regulator of this application can make the difference between the outlet pressure and the initial 0.3MPa pressure not obvious, with the difference within ±0.03MPa; (3) This application implements electronic control regulation of flow output through flow control system, which can accurately output flow. The entire electronic flow meter is highly integrated, and the ingenious gas path design avoids the abnormal noise problem that is easy to occur in electronic flow meter. It ensures the accuracy of the flow sensor reading in electronic flow meter within a limited space. At the same time, it can achieve high oxygen flow, with an accurate output flow rate of up to 60L / min. In addition, the safety oxygen component can supply oxygen when the anesthesia machine loses power, which improves the safety of the anesthesia machine.

[0016] (5) This application can select the driving gas from air and oxygen through the driver conversion switch. When air is available, it can automatically select to drive with air, which reduces the cost of gas use during surgery; (6) The outlet of the driving gas in this application is monitored by an electronic pressure sensor, which reduces the risk of inaccurate tidal volume of inhalation and exhalation due to insufficient or excessive driving gas pressure. (7) The IP valve in this application is designed with a gas volume space at the front end of the valve port, which can effectively prevent abnormal noise of the IP valve under certain circumstances; (8) The oxygen concentration monitoring in this application uses the principle of paramagnetic oxygen, which has no consumables and has a calibration function. The solenoid valve at the inlet of the paramagnetic oxygen module is calibrated when energized and monitors the oxygen concentration normally when de-energized, thus reducing the risk of oxygen concentration failure due to solenoid valve failure. (9) The front end of the one-way expiratory valve of this application is designed with an electronic expiratory pressure sensor to provide the correct feedback signal for the closed-loop control of PEEP, thereby accurately controlling the patient's end-expiratory airway pressure. (10) The fresh gas in this application is located very close to the inspiratory check valve at the inlet of the inspiratory branch (in front), ensuring that the patient’s inspiratory volume includes all the newly supplied fresh gas each time he inhales, thereby increasing the rate of increase in anesthetic gas concentration. (11) This application has the function of automatically calibrating the inspiratory flow sensor and the expiratory flow sensor, which avoids the problem of inaccurate tidal volume after long-term use, and the calibration speed is fast, saving time and effort compared with manual calibration; (12) The driving gas of this application adopts a coil-type gas circuit built-in design, which can reduce the gas discharge containing anesthetic gas in the circuit system, save the consumption of anesthetic drugs, and at the same time reduce the volume required for the driving gas to achieve its function, thus reducing the risk of gas leakage. (13) The inspiratory flow sensor and expiratory flow sensor of this application have an automatic zeroing function to avoid inaccurate tidal volume detection due to sensor zero drift. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the airway structure of the anesthesia machine provided in this application; Figure 2 This is a schematic diagram of the gas path structure of the nitrous oxide assembly provided in this application. Figure 3 This is a schematic diagram of the air circuit structure of the air assembly provided in this application. Figure 4 This is a schematic diagram of the gas path structure of the oxygen assembly provided in this application. Figure 5 This is a schematic diagram of the gas path structure of the flow control system provided in this application. Figure 6 This is a schematic diagram of the gas path structure of the anesthetic gas delivery system provided in this application; Figure 7 This is a schematic diagram of the inspiratory and expiratory airway structures provided in this application. Figure 8 This is a schematic diagram of the automatic assisted breathing circuit and the manual assisted breathing circuit provided in this application. Figure 9 This is a schematic diagram of the gas path structure of the safety oxygen assembly provided in this application. Figure 10 This is a schematic diagram of the gas path structure of the rapid oxygen supply component provided in this application. Figure 11 This is a schematic diagram of the gas path structure of the oxygen therapy component provided in this application; Figure 12 This is a schematic diagram of the air circuit structure of the auxiliary power pneumatic assembly provided in this application. Figure 13 This is a schematic diagram of the IP valve structure provided in an embodiment of this application; Figure 14 This is a cross-sectional view of the IP valve provided in an embodiment of this application.

[0018] Reference numerals: 1. Nitrous oxide pipeline gas source; 2. Nitrous oxide high-pressure cylinder; 3. Air pipeline gas source; 4. Oxygen pipeline gas source; 5. Oxygen high-pressure cylinder; 6. Filter; 7. First high-pressure regulator; 8. High-pressure sensor; 9. Check valve; 10. Low-pressure sensor; 11. Second high-pressure regulator; 12. Pressure reducing valve; 13. Drive gas conversion switch; 14. Atmospheric end; 15. Solenoid valve; 16. Proportional valve; 17. Electron flow... 18. Flow meter; 19. Flow regulating valve; 20. Safety oxygen flow meter; 21. Solenoid valve; 22. Rapid oxygen supply assembly; 23. Bypass valve; 24. Evaporator; 25. Safety oxygen regulating valve; 26. Pressure reducing valve; 27. Solenoid valve; 28. Inhalation valve; 29. ​​Air resistance valve; 30. IP valve; 31. Safety valve; 32. Exhalation valve; 33. APL valve; 34. Coil; 35. Manual / mechanical control switch; 36. 37. Auxiliary fresh gas outlet switch; 38. Sodium lime container; 39. Inspiratory one-way valve; 40. Expiratory one-way valve; 41. Expiratory pressure differential assembly; 42. Inspiratory pressure differential assembly; 43. Patient; 44. Gas module; 45. Paramagnetic oxygen; 46. Skin bag; 47. Heating assembly; 48. First airway pressure sensor; 49. Waste gas treatment device; 50. Auxiliary power gas assembly; 51. Safety oxygen conversion switch; 52. Flow sensor; 53. Driving gas pressure sensor; 54. Expiratory pressure sensor; 55. First solenoid valve; 56. Second solenoid valve; 57. Third solenoid valve; 58. Fourth solenoid valve; 59. Inspiratory flow sensor; 60. Expiratory flow sensor; 301. Second airway pressure sensor; 302. PEEP control port; 303. First outlet; 304. Second outlet; 305. Inlet; 306. Gas volume space; 307. Flow stabilizing perforated plate. Detailed Implementation

[0019] The technical solution of this application will be described in detail below with reference to the accompanying drawings and embodiments.

[0020] This application provides an anesthesia machine for anesthetizing a patient 42 during surgery, specifically, as shown in the embodiment. Figure 1 As shown, the anesthesia machine includes a gas supply system, a flow control system connected to the gas supply system, an anesthetic gas delivery system connected to the flow control system, and a circuit system connected to the anesthetic gas delivery system. The gas supply system provides air and nitrous oxide, or oxygen and nitrous oxide. The flow control system controls the flow rate of the provided air and nitrous oxide, or the provided oxygen and nitrous oxide. The anesthetic gas delivery system vaporizes the anesthetic drug and mixes it with the gas supplied by the gas supply system to generate anesthetic gas, which is then delivered to the circuit system. The circuit system delivers the anesthetic gas to the patient's lungs to anesthetize the patient and also assists the patient's breathing.

[0021] Furthermore, the gas supply system includes a nitrous oxide assembly for supplying nitrous oxide, an oxygen assembly for supplying oxygen, and an air assembly for supplying air. Each of the nitrous oxide assembly, oxygen assembly, and air assembly is equipped with a pressure sensor and a high-pressure regulator. Specifically, the nitrous oxide assembly includes a first nitrous oxide branch, a second nitrous oxide branch, and a pressure reducing valve 12; see reference... Figure 2 As shown, the first nitrous oxide branch includes a connected nitrous oxide pipeline gas source 1, a filter 6, a low-pressure sensor 10, and a one-way valve 9; the second nitrous oxide branch includes a connected nitrous oxide high-pressure cylinder 2, a filter 6, a high-pressure sensor 8, a second high-pressure regulator 11, and a one-way valve 9; the one-way valves 9 of both the first and second nitrous oxide branches are connected to the pressure reducing valve 12. Specifically, if nitrous oxide is supplied through the nitrous oxide pipeline gas source 1, the nitrous oxide first passes through the filter 6 and then enters the pressure reducing valve 12 through the one-way valve 9. After the pressure reduction is completed, the nitrous oxide enters the flow control system, and the low-pressure sensor 10 monitors the nitrous oxide pressure. If nitrous oxide is supplied through the nitrous oxide high-pressure cylinder 2, the nitrous oxide first passes through the filter 6 and then enters the second high-pressure regulator 11 for the first pressure reduction. After the first pressure reduction, the nitrous oxide enters the pressure reducing valve 12 through the one-way valve 9. After the second pressure reduction is completed, the nitrous oxide enters the flow control system, and the high-pressure sensor 8 monitors the nitrous oxide pressure.

[0022] The air assembly includes a connected air duct, an air source 3, a filter 6, a low-pressure sensor 10, a one-way valve 9, and a pressure reducing valve 12. For details, see [link to relevant documentation]. Figure 3 As shown, the air from the air source 3 in the air duct is filtered by the filter 6 and then enters the pressure reducing valve 12 through the one-way valve 9. After pressure reduction, it enters the flow control system. At the same time, the air pressure is monitored by the low-pressure sensor 10.

[0023] See Figure 4The oxygen assembly includes a first oxygen branch, a second oxygen branch, and a pressure reducing valve 12. The first oxygen branch includes a connected oxygen pipeline gas source 4, a filter 6, a low-pressure sensor 10, and a one-way valve 9. The second oxygen branch includes a connected high-pressure oxygen cylinder 5, a filter 6, a high-pressure sensor 8, a first high-pressure pressure reducer 7, and a one-way valve 9. Both the one-way valves 9 of the first and second oxygen branches are connected to the pressure reducing valve 12. Specifically, if oxygen is supplied through the oxygen pipeline gas source 4, the oxygen first passes through the filter 6 and then enters the pressure reducing valve 12 through the one-way valve 9. After the oxygen pressure is reduced, it enters the flow control system, while the low-pressure sensor 10 monitors the oxygen pressure. If oxygen is supplied through the high-pressure oxygen cylinder 5, the oxygen first passes through the filter 6 and then enters the first high-pressure pressure reducer 10 for the first pressure reduction. After the first pressure reduction, nitrous oxide enters the pressure reducing valve 12 through the one-way valve 9. After the second pressure reduction, it enters the flow control system, while the high-pressure sensor 8 monitors the nitrous oxide pressure.

[0024] In one example, the first high-pressure regulator 7 has a pressure of 350 kPa, the second high-pressure regulator 11 has a pressure of 300 kPa, and the pressure reducing valve 12 has a pressure of 250 kPa. The filter 6, high-pressure sensor 8, first high-pressure regulator 7, and one-way valve 9 in the second oxygen branch can be integrated into an oxygen high-pressure regulator; the filter 6, high-pressure sensor 8, second high-pressure regulator 11, and one-way valve 9 can be integrated into a nitrous oxide high-pressure regulator. By integrating these components, the space required for component placement can be reduced.

[0025] In the gas supply system, under special circumstances, when there is no gas output from the nitrous oxide pipeline gas source 1, the air pipeline gas source 3, and the oxygen pipeline gas source 4, the nitrous oxide high-pressure cylinder 2 and the oxygen high-pressure cylinder 5 can be opened to provide the necessary gas supply to the downstream, thus avoiding accidents caused by the sudden interruption of the pipeline gas supply, which could lead to the anesthesia machine being unable to operate normally.

[0026] The low-pressure sensor 10 can monitor the pressure of the nitrous oxide pipeline gas source 1, the air pipeline gas source 3, and the oxygen pipeline gas source 4 in real time, and will issue an alarm when the pressure is too low or too high. Specifically, the filter 6 in the gas supply system can filter impurities in the gas source, and the one-way valve 9 can prevent gas backflow; the low-pressure sensor 10 can monitor the pressure of the gas source and will issue an alarm when the gas source pressure is too low; the high-pressure sensor 8 can monitor the pressure of the high-pressure gas cylinder; the pressure reducing valve 12 can reduce the gas source pressure (2.8 bar to 6 bar) to 2.5 bar, providing a stable and safe gas supply environment for the downstream.

[0027] The initial outlet pressure of the oxygen high-pressure regulator is adjusted to 350 kPa. The effective orifice of the valve is relatively large, and the outlet pressure decrease is within 30 kPa when the flow rate is 120 L / min. This ensures that the oxygen supply pressure of the driving gas is stable and provides a stable gas pressure to the front end of the intake valve 28.

[0028] This application embodiment uses pressure sensors to sample and monitor the nitrous oxide assembly, air assembly, and oxygen assembly, which reduces the layout space for gas source pressure monitoring, lowers the risk of gas leakage, and realizes electronic gas source pressure monitoring. At the same time, the high-pressure regulator can make the difference between the outlet pressure and the initial adjustment pressure of 0.3MPa insignificant, with the difference within ±0.03MPa.

[0029] Furthermore, the flow control system of the anesthesia machine of this application includes a first flow control branch connected to a nitrous oxide assembly or an air assembly, and a second flow control branch connected to an oxygen assembly, for supplying the flow control system with nitrous oxide and air, or nitrous oxide and oxygen, after flow control. Specifically, the first flow control branch is connected to the nitrous oxide assembly or the air assembly, and the second flow control branch is connected to the oxygen assembly.

[0030] The first flow control branch includes a solenoid valve 15, a proportional valve 16, and an electronic flow meter 17, which are respectively connected to the nitrous oxide assembly and the air assembly. The solenoid valve 15 is controlled to open or close, thus connecting the first flow control branch to either the nitrous oxide assembly or the air assembly. For details, please refer to [link to relevant documentation]. Figure 5 As shown, the first control branch includes two solenoid valves 15. One solenoid valve 15 is connected to the pressure reducing valve 12 in the nitrous oxide assembly, and the other solenoid valve is connected to the pressure reducing valve 12 in the air assembly.

[0031] The second flow control branch includes a solenoid valve 15, a proportional valve 16, and an electronic flow meter 17 connected to the oxygen assembly.

[0032] In the first flow control branch and the second flow control branch, the air passage between the outlet of the solenoid valve 15 and the inlet of the proportional valve 16 is directly opposite, and the outlet diameter of the solenoid valve 15 is larger than the outlet diameter of the proportional valve 16.

[0033] Specifically, the solenoid valve 15 of the flow control system is a normally closed solenoid valve, which can control the opening and closing of the gas path by switching on and off the power. When the power is off, the gas path is blocked. The opening size of the valve port can be controlled by the magnitude of the current supplied to the proportional valve 16, thereby controlling the flow output. The electronic flow meter 17 can measure the gas flow rate. The proportional valve 16 and the electronic flow meter 17 work together to realize closed-loop control of the flow output of the electronically controlled flow meter. Taking the oxygen output of the oxygen component with a certain flow rate of the electronically controlled flow meter as an example, after the oxygen flow rate is set to a certain value, the solenoid valve 15 of the oxygen component is energized and opens. The proportional valve 16 of the oxygen component will open and control the valve port size according to the control curve of flow and current and the set value. The electronic flow meter 17 will detect the oxygen flow value. If the detected flow value is inconsistent with the set value, the proportional valve 16 will receive a new current value, and the valve port of the proportional valve 16 will change accordingly. The output oxygen flow rate will also approach the set value until the set value is consistent with the value detected by the electronic flow meter 17, thus achieving a stable state of oxygen flow output. Furthermore, the anesthesia machine in this embodiment also includes a display screen, on which the detection value of the electronic flow meter 17 is displayed in real time.

[0034] In one example, the flow control system is a component consisting of three solenoid valves 15, two proportional valves 16, and two electronic flow meters 17 integrated together.

[0035] Specifically, the flow control system is highly integrated, with oxygen, air, or nitrous oxide set on the display screen. The electronically controlled flow meter can automatically adjust and control, accurately outputting the flow rate of different types of gases. The gas path between the solenoid valve 15 and the proportional valve 16 avoids perpendicular intersection. The gas path between the outlet of the solenoid valve 15 and the inlet of the proportional valve 16 is aligned, and the orifice diameter is not smaller than the required orifice diameter of the proportional valve 16 outlet, effectively avoiding abnormal noise from the proportional valve. The gas path between the outlet of the proportional valve 16 and the inlet of the electronic flow meter 17 has as few bends as possible, and the orifice diameter is approximately equal to the inner diameter of the inlet of the electronic flow meter 17. A grid-type flow stabilizing device is added to the inlet of the electronic flow meter 17 to ensure that the thermal electronic flow meter 17 can accurately read the gas flow rate value and avoid the problem of slight fluctuations in the displayed value when outputting the flow rate. The gas path between the outlet of the solenoid valve (NC) 15 and the inlet of the proportional valve 16 is directly aligned, and the orifice diameter is not smaller than the required orifice diameter of the proportional valve 16 outlet, effectively avoiding abnormal noise from the proportional valve. The gas path between the outlet of the proportional valve 16 and the inlet of the electronic flowmeter 17 has minimal bends, and the orifice diameter is approximately equal to the inner diameter of the electronic flowmeter 17 inlet. A grid-type flow stabilizer is added to the inlet of the electronic flowmeter 17 to ensure that the thermal electronic flowmeter 17 can accurately read the gas flow rate value, avoiding slight fluctuations in the displayed value during output flow. The flow control system in this embodiment implements electronic control regulation of the flow output, enabling precise flow output. The entire electronic flowmeter is highly integrated, and the ingenious gas path design avoids the abnormal noise problems that are common in electronic flowmeters. It ensures the accuracy of the flow sensor readings within a limited space; simultaneously, it can achieve high oxygen flow rates, with a precise output flow rate of up to 60 L / min.

[0036] Furthermore, the anesthetic gas delivery system of this application embodiment includes a bypass valve 23, an vaporizer 24, and an auxiliary fresh gas outlet switch 36, for generating and delivering anesthetic gas. For details, please refer to... Figure 6 As shown, the gas in the flow control system enters the anesthetic gas delivery system through the bypass valve 23, where it mixes with the vaporized anesthetic drug from the vaporizer 24 to generate anesthetic gas. Simultaneously, the auxiliary fresh gas outlet switch 36 selects whether to deliver the generated anesthetic gas to the loop system or output it to another location. The outlet end of the auxiliary fresh gas outlet switch 36 (i.e., the inlet of the fresh gas in the loop system) is designed to be close to the inhalation check valve, ensuring that the patient's inhalation volume includes all the newly supplied fresh gas each time they inhale, thus increasing the rate of increase in anesthetic gas concentration.

[0037] In one example, the bypass valve 23 is a two-position three-way valve. When the evaporator 24 is closed, the flow from the electrically controlled flow meter 17 bypasses the evaporator 24 and flows into the loop system. When the evaporator 24 is opened, the top column on the evaporator 24 inserts into the bypass valve 23, changing the direction of the electrically controlled flow meter into the evaporator 24 and outputting the anesthetic gas mixture. The evaporator 24 has a dial, and the concentration of the anesthetic gas can be accurately output by rotating the dial to different scale values.

[0038] Further, see Figure 7 As shown, the loop system of this embodiment includes an inspiratory branch, an expiratory branch, a paramagnetic oxygen sensor 44, an anesthetic gas concentration detection component 43, a manual / mechanical control switch 35, an automatic assisted breathing branch, a manual assisted breathing branch, and a heating component 46. The loop system is connected to the anesthetic gas delivery system through the inspiratory branch. Specifically, the inspiratory branch is connected to the auxiliary fresh gas outlet switch 36 to deliver anesthetic gas to the patient 42. The expiratory branch delivers the gas exhaled by the patient 42. The paramagnetic oxygen sensor 44 is connected to both the inspiratory and expiratory branches to detect the oxygen concentration of the loop system. The anesthetic gas concentration detection component 43 is connected to both the inspiratory and expiratory branches to detect the anesthetic gas concentration of the loop system. The manual / mechanical control switch 35 selects between the automatic and manual assisted breathing branches. The heating component 46 is located between the inspiratory and expiratory branches to heat the gas in the loop system.

[0039] When the air pump on the paramagnetic oxygen sensor 44 is working, it can realize the function of air sampling. When the solenoid valve at the front end of the paramagnetic oxygen module inlet is energized, the inlet of the paramagnetic oxygen module is connected to the atmosphere, and the air pump draws in the gas from the atmosphere, thereby realizing the function of oxygen concentration calibration. When the power is lost, the air pump draws in the gas from the inspiratory end of the patient 42, realizing the function of detecting the oxygen concentration at the inspiratory end of the patient 42. The solenoid valve energization calibration scheme reduces the risk of oxygen concentration not being able to be monitored due to solenoid valve failure.

[0040] For more details, please refer to the following: Figure 7 As shown, the inspiratory branch includes an inspiratory pressure differential assembly 41, a first airway pressure sensor 47, a second airway pressure sensor 60, an inspiratory one-way valve 38, and a soda lime container 37. One end of the inspiratory pressure differential assembly 41 is connected to the patient 42, and the other end is connected to one end of the inspiratory one-way valve 38. The first airway pressure sensor 47 and the second airway pressure sensor 60 are positioned between the inspiratory pressure differential assembly and the inspiratory one-way valve. The other end of the inspiratory one-way valve 38 is connected to an auxiliary fresh gas outlet switch 36, and the other end is connected to one end of the soda lime container 37. The other end of the soda lime container 37 is connected to both the automatic assisted breathing branch and the manual assisted breathing branch.

[0041] The expiratory branch includes an expiratory pressure differential assembly 40, an expiratory pressure sensor 53, and an expiratory one-way valve 39.

[0042] One end of the expiratory pressure differential assembly 40 is connected to the patient 42, and the other end is connected to the expiratory one-way valve 39. The expiratory pressure sensor 53 is located between the expiratory pressure differential assembly and the expiratory one-way valve 39. The expiratory one-way valve 39 is connected to the automatic assisted breathing branch and the manual assisted breathing branch, respectively.

[0043] Specifically, during anesthesia, anesthetic gas enters the soda lime container 37 during inhalation, and then passes through the inhalation one-way valve 38 and the inhalation pressure differential assembly 41 before entering the patient's lungs. During exhalation, the anesthetic gas enters the expiratory pressure differential assembly 40 and passes through the expiratory one-way valve 39. During anesthesia, the anesthetic gas concentration detection component 43 detects the anesthetic gas concentration, and the paramagnetic oxygen sensor 44 detects the oxygen concentration.

[0044] Furthermore, the inspiratory pressure differential assembly 41 includes a first solenoid valve 54, a second solenoid valve 55, and an inspiratory flow sensor 8; the expiratory pressure differential assembly 40 includes a third solenoid valve 56, a fourth solenoid valve 57, and an expiratory flow sensor 59. The expiratory pressure sensor 53 provides the correct feedback signal for the closed-loop control of PEEP, thereby precisely controlling the end-expiratory airway pressure of the patient 42.

[0045] Specifically, the inspiratory differential pressure assembly 41 and the expiratory differential pressure assembly 40 are essentially flow valves that facilitate flow measurement by differential pressure sensors. The inspiratory flow sensor 58 calculates the inspiratory flow rate by monitoring the pressure before and after the valve port of the inspiratory differential pressure assembly 41 and converts the inspiratory flow rate into inspiratory tidal volume, which is then displayed on the screen. The expiratory flow sensor 59 calculates the expiratory flow rate by monitoring the pressure before and after the valve port of the expiratory differential pressure assembly 40 and converts the expiratory flow rate into expiratory tidal volume, which is then displayed on the screen. To ensure the accuracy of the tidal volume calculated by the inspiratory flow sensor 58 and the expiratory flow sensor 59, zeroing is required after a period of use. Valves 54, 55, 56, and 57 are two-position three-way valves. When the zeroing function is activated, the solenoid valves connect the inspiratory flow sensor 58 and the expiratory flow sensor 59 to the atmosphere to achieve the zeroing function. After the zeroing is completed, the inspiratory flow sensor 58 and the expiratory flow sensor 59 are connected to the airway through the solenoid valves to achieve the monitoring function of inspiratory and expiratory tidal volume. When the anesthesia machine is working normally, the pressure collected by the inspiratory flow sensor 58 and the expiratory flow sensor 59 is the pressure in the loop system. When the inspiratory flow sensor 58 and the expiratory flow sensor 59 are zeroing, the pressure collected by the inspiratory flow sensor 58 and the expiratory flow sensor 59 is atmospheric pressure. Heating component 46 maintains a certain temperature in the circuit system, ensuring that the temperature of the gas flowing into the patient's body is suitable and preventing the patient's exhaled gas from condensing into liquid water in the circuit system. Inhalation one-way valve 38 ensures that the patient's exhaled gas does not flow back out during exhalation, thus preventing the patient from re-inhaling contaminated gas in the next respiratory cycle. Exhalation one-way valve 39 ensures that the patient's exhaled gas from the previous respiratory cycle does not flow back into the patient's body during inhalation. Soda lime container 37 absorbs carbon dioxide exhaled by the patient, preventing the carbon dioxide content in the circuit system from being too high.

[0046] For further information, please refer to [link / reference]. Figure 8As shown, the automatic assisted breathing circuit includes a driving gas conversion switch 13, a pressure reducing valve 26, a driving gas pressure sensor 52, a gas path module assembly, a gas resistance 29, an IP valve 30, an exhalation valve 32, an exhaust gas treatment device 48, and a coil 34, for automatic assisted breathing. The drive gas switching switch 13 has its first end connected to the oxygen assembly, its second end exposed to air, and its third end connected to one end of the pressure reducing valve 26. The other end of the pressure reducing valve 26 is connected to the first end of the gas path module assembly. The second end of the gas path module assembly is connected to one end of the air resistance 29, and its third end is connected to the coil 34. The coil 34 is connected to the manual control switching switch 35. The drive gas pressure sensor 52 is positioned between the pressure reducing valve 26 and the gas path module assembly. One end of the exhalation valve 32 is positioned between the gas path module assembly and the coil 34, and the other end is connected to the waste gas treatment device 48. The other end of the air resistance 29 is connected to one end of the IP valve 30, and the other end of the IP valve 30 is exposed to air. The manual assisted breathing branch includes a bladder 45 and a pressure regulating and limiting valve 33 for artificial assisted breathing. The IP valve 30 is an electromagnet-type solenoid valve, which controls the opening size of the valve port by controlling the energization of the control coil. The valve port has a large air capacity at its front end to prevent abnormal noise when the valve port is opened to a specific position.

[0047] Specifically, please refer to Figure 13-14 As shown, the IP valve 30 of this application embodiment includes a PEEP air control port 301, a first air outlet 302, a second air outlet 303, an air inlet 304, an air volume space 305, and a flow-stabilizing perforated plate 306. The air volume space 305 is disposed at the IP valve port. Through the air volume space, the abnormal noise problem of the IP valve under certain conditions can be effectively prevented.

[0048] Specifically, the gas path module includes an inspiratory valve 28, a filter 6, a flow sensor 51, a safety valve 31, and a solenoid valve 27. One end of the inspiratory valve 28 is connected to a pressure reducing valve 26, and the other end is connected to one end of the filter 6. The other end of the filter 6 is connected to one end of the flow sensor 51, and the other end of the flow sensor 51 is connected to a coil 34. The flow sensor 31 is positioned between the flow sensor 51 and the coil 34. One end of the solenoid valve 27 is connected to the pressure reducing valve 26, and the other end is connected to one end of the air resistance 29. The flow sensor 51 and the inspiratory valve 28 enable closed-loop control of the flow output, allowing for automatic calibration of the inspiratory flow sensor 58 and the expiratory flow sensor 59. This avoids inaccurate tidal volume readings after prolonged use and provides faster calibration than manual calibration, saving time and effort.

[0049] Specifically, the drive gas selector switch 13 is an electrically controlled two-position three-way valve. In the machine-controlled mode of the anesthesia machine, when an air source is available, the solenoid valve on the drive gas selector switch 13 is energized and opens. Air is driven by the solenoid valve to move the valve core from the air inlet to the oxygen inlet and seal the oxygen inlet. The drive gas (air) is then output to the downstream gas path module assembly. When the solenoid valve is de-energized, the valve core of the drive gas selector switch 13 seals the air inlet due to the spring force, and the drive gas (oxygen) is output to the downstream gas path module assembly. This achieves the drive gas selection function. The drive gas pressure sensor 52 can detect the gas pressure at the outlet of the pressure reducing valve (175kPa) 26, preventing the outlet pressure from being too low due to the failure of the pressure reducing valve (175kPa) 26. Excessively low outlet pressure of the pressure reducing valve (175kPa) 26 directly affects the peak flow rate and tidal volume accuracy of the inhalation valve 28. An alarm will sound if the pressure detected by the drive gas pressure sensor 52 is too high or too low. Pressure reducing valve 26 reduces the pressure of the driving gas to 175 kPa; the valve port of inspiratory valve 28 changes with the current value; filter 6 filters impurities in the gas; flow sensor 51 detects the flow rate output by proportional valve 28 in real time; safety valve 31 releases pressure to protect the patient when the airway pressure is too high; solenoid valve 27 is a normally closed solenoid valve that opens when energized, allowing airflow, and closes when de-energized, cutting off airflow; air resistance 29 is a fixed air resistance; IP valve 30 is essentially a solenoid valve, and changing the current allows the IP valve port to open to varying degrees; expiratory valve 32 is a pneumatically controlled spring-loaded mechanical valve that controls the ease of opening the valve port according to the control pressure. When the anesthesia machine is set to machine-controlled mode, solenoid valve 27 is energized. The control gas flowing from solenoid valve 27 opens the manual / machine control switch 35 to machine control mode. Another gas path from solenoid valve 27 flows through air resistance 29 and IP valve 30 before being discharged to the atmosphere. When the positive end-expiratory pressure is set to 0, during patient exhalation, IP valve 30 is only slightly energized and its opening is large. The control gas pressure between air resistance 29 and IP valve 30 is negligible. All the gas in the patient's lungs flows through exhalation valve 32 and is discharged to the waste gas treatment device 48. To prevent atelectasis, a certain positive end-expiratory pressure (PEEP) is set. At the end of the patient's expiration, IP valve 30 receives a certain current value, causing the valve port to open to a certain position. The control pressure between air resistance 29 and the air passage of IP valve 30 is applied to the expiratory valve 32, so that a portion of air remains in the patient's lungs at the end of expiration to support the alveoli. The higher the PEEP value is set, the more current IP valve 30 receives, the greater the control pressure applied to the expiratory valve 32 between air resistance 29 and the air passage of IP valve 30, and the greater the air pressure in the patient's lungs at the end of expiration.When a certain tidal volume is set in machine control mode, the intake valve 28 will open to a certain position according to the current-flow calibration curve, outputting a certain flow rate of gas, which is monitored by the flow sensor 51. When the set tidal volume value is inconsistent with the flow rate value monitored by the flow sensor 51, the system will automatically change the current of the intake valve 28 to change the size of the intake valve opening, thereby changing the output flow rate value until the set tidal volume is consistent with the output flow rate value monitored by the flow sensor 51.

[0050] Specifically, during manual assisted breathing, the patient's breathing is assisted by manually squeezing the sac 45.

[0051] Specifically, the coil 34 contains a vortex-shaped cavity, the size of which determines the upper limit of the tidal volume. The pressure limiting valve 33, used in manual mode, adjusts the upper limit of airway pressure. When the airway pressure exceeds the valve's setting, the airway depressurizes, thus limiting end-expiratory airway pressure and protecting the patient. In manual mode, the bag 45 can be squeezed at a specific frequency to provide respiratory support for patients without spontaneous breathing. The coil 34 reduces the amount of anesthetic gas expelled from the circuit system, saving anesthetic consumption, and also reduces the volume required for the driving gas function, lowering the risk of leakage.

[0052] Specifically, taking the provision of respiratory support to the patient in the manual mode of the anesthesia machine as an example, when the hand squeezes the bag 45, the anesthetic gas flows through the soda lime canister 37, filters carbon dioxide, and flows into the patient's body through the inspiratory one-way valve 38 and the inspiratory pressure differential component 41. When the hand releases the bag, the gas flows from the patient's body through the expiratory one-way valve 39 into the bag 45, thereby realizing the function of providing respiratory support to the patient in the manual mode.

[0053] Taking the provision of respiratory support to the patient in the machine-controlled mode of the anesthesia machine as an example, when the manual machine control switch 35 is switched to the machine control position to provide inspiratory support to the patient, the expiratory valve 32 is closed, and the system provides a certain current to the inspiratory valve 28 so that the valve opening is opened to a certain position. Gas flows out from the inspiratory valve 28 and flows through the filter 6 and the flow sensor 51 to form air pressure at the coil 34. The manual machine control switch 35 is turned on, which can then provide power to the anesthetic gas in the inspiratory branch. The anesthetic gas flows through the soda lime canister 37, the inspiratory one-way valve 38, and the inspiratory pressure differential component 41 to the patient's body. The output flow of the inspiratory valve is related to the set tidal volume. The inspiratory valve can achieve closed-loop control of the output flow according to the tidal volume setting. When the patient exhales, the inspiratory valve 28 is closed and the expiratory valve is opened. The gas in the patient's body flows through the expiratory pressure differential component 40 and the expiratory one-way valve 39. At the same time, when exhaling, the expiratory valve 32 is opened, reducing the air pressure in the coil 34, thereby causing the anesthetic gas to lose its driving force to complete assisted breathing.

[0054] Furthermore, the anesthesia machine in this embodiment also includes an oxygen therapy component and a safety oxygen component, see reference. Figure 11 Place The oxygen therapy component is connected to the oxygen supply component to provide auxiliary oxygen. The oxygen therapy component includes a rotary flow regulating valve 19 and a 60L flow meter (18). The output flow range of the oxygen therapy component is 0-60L / min. The 60L flow meter 18 is a mechanical float flow meter. The flow output is controlled by rotating the flow regulating valve 19. A certain air resistance is designed at the front end of the 60L flow meter 18 to prevent the actual flow rate from exceeding 60L / min due to excessive throttling valve opening. The flow regulating valve 19 has a fine thread, with a metal external thread and a plastic wear-resistant internal thread. This ensures a tight fit between the threads, preventing the 60L flow meter 18 float from bouncing under high flow rates and avoiding the risk of air leakage. The inner diameter of the oxygen therapy device's outlet must not be less than 6mm to prevent back pressure from affecting the inaccurate flow output. The oxygen therapy device is composed of a 60L flow meter 18 and a flow regulating valve 19.

[0055] In one example, when a patient is weak but can breathe independently, breathing is more difficult than normal and they are prone to hypoxia. The oxygen therapy device can continuously provide oxygen to the patient's nose.

[0056] Please see Figure 9 As shown, one end of the safety oxygen component is connected to the oxygen component, and the other end is connected to the flow control system. It is used to control the oxygen flow when the anesthesia machine loses power. The safety oxygen component includes a safety oxygen changeover switch 50, a solenoid valve 21, a safety oxygen regulating valve 25, and a safety oxygen flow meter 20, all connected to each other. When the anesthesia machine is powered on, the solenoid valve 21 is energized, and the safety oxygen path is blocked. Pressing the safety oxygen changeover switch 50 de-energizes the solenoid valve 21, opening the safety oxygen path. Adjusting the safety oxygen regulating valve 25 adjusts the flow rate. The safety oxygen flow meter 20 is a mechanical float-type flow meter; the flow rate can be read by observing the float's position. The oxygen flowing from the safety oxygen component passes through the electronic flow meter 17, and the flow rate detected by the electronic flow meter 17 is displayed on the anesthesia machine's screen. The safety oxygen component is a component consisting of the safety oxygen flow meter 20, the solenoid valve 21, the safety oxygen regulating valve 25, and the safety oxygen changeover switch 50.

[0057] Furthermore, the anesthesia machine in this embodiment also includes a rapid oxygen supply component 22. One end of the rapid oxygen supply component 22 is connected to the oxygen component, and the other end is connected to the anesthetic gas delivery system for diluting the concentration of anesthetic gas. Before intubation, sufficient oxygen needs to be pre-filled into the patient's body within a short time. Pressing the rapid oxygen supply component 22 quickly fills the bag 45 with oxygen, allowing for manual ventilation of the patient, significantly shortening the pre-oxygenation time. When the surgery ends, since a large amount of anesthetic gas remains in the airway, pressing the rapid oxygen supply component can quickly expel the anesthetic gas from the airway, accelerating the patient's awakening.

[0058] Furthermore, the anesthesia machine in this embodiment of the application also includes an auxiliary power gas assembly 49, one end of which is connected to an oxygen assembly, which can provide power gas for other medical devices in the operating room, such as providing power gas for a negative pressure aspirator, so that the negative pressure aspirator can perform negative pressure aspiration.

[0059] Furthermore, in the anesthesia machine of this embodiment, when in operation, because the pressure at the gas source of the gas supply system is relatively high, the gas supplied by the gas supply system, after being reduced in pressure by the pressure reducing valve 12, can provide oxygen, air, and nitrous oxide to the electrically controlled flow meter 17. The electrically controlled flow meter 17 can accurately control the output of different types of gases. The gas output by the electrically controlled flow meter 17 provides power for the anesthetic gas output by the vaporizer 24. By adjusting the vaporizer 24, the anesthetic mixed gas can be accurately output. The anesthetic mixed gas output by the vaporizer 24 can be controlled by the auxiliary fresh gas outlet switch 36 to be output to the inspiratory branch or to supply anesthetic mixed gas to the outside of the equipment. The anesthesia machine provides mechanical ventilation for patients without spontaneous breathing in two modes: manual mode and machine-controlled mode. The switching between the two modes is controlled by the manual-machine control switch. When mechanical ventilation is in manual mode, the patient needs to be manually squeezed at a certain respiratory rate to provide respiratory support. The anesthesia machine can only achieve machine control function when there is a power supply. When mechanical ventilation is in machine control mode, the gas supply system can provide driving gas oxygen or air to replace manual squeezing of the bag. The driving gas is controlled by the driving gas selection switch 13. The driving gas after pressure reduction by the pressure reducing valve 26 can be adjusted by the inspiratory valve 28 to accurately control the tidal volume. The volume of the coil 34 determines the limit of the tidal volume that the system can provide. When the anesthesia machine is not powered, the gas supply system can provide oxygen to the vaporizer by manually adjusting the safety oxygen component to realize the anesthesia function of the anesthesia machine and provide respiratory support to the patient by manually squeezing the bag.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application, and should all be covered within the scope of the claims of this application.

Claims

1. An anesthesia machine, characterized in that, include: A gas supply system, a flow control system and a safety oxygen assembly connected to the gas supply system, and an anesthetic gas delivery system and a circuit system connected to the flow control system and the safety oxygen assembly; The gas supply system includes a nitrous oxide assembly for providing nitrous oxide, an oxygen assembly for providing oxygen, and an air assembly for providing air. Each of the nitrous oxide assembly, the oxygen assembly, and the air assembly is equipped with a pressure sensor and a high-pressure regulator. The flow control system includes a first flow control branch and a second flow control branch, used to provide nitrous oxide and air, or nitrous oxide and oxygen, to the anesthetic gas delivery system after flow control when energized. One end of the safety oxygen component is connected to the oxygen component, and the other end is connected to the flow control system. It is used to control the oxygen flow when the anesthesia machine loses power. The safety oxygen component includes a safety oxygen changeover switch (50), a solenoid valve (21), a safety oxygen regulating valve (25), and a safety oxygen flow meter (20) connected to each other. The anesthetic gas delivery system includes a bypass valve (23), an vaporizer (24), and an auxiliary fresh gas outlet switch (36) for generating and delivering anesthetic gas; The circuit system includes an inspiratory branch, an expiratory branch, a paramagnetic oxygen sensor (44), an anesthetic gas concentration detection component (43), a manual control switch (35), an automatic assisted breathing branch, a manual assisted breathing branch, and a heating component (46). The circuit system is connected to the anesthetic gas delivery system through the inspiratory branch.

2. The anesthesia machine according to claim 1, characterized in that, The nitrous oxide assembly includes a first nitrous oxide branch, a second nitrous oxide branch, and a pressure reducing valve (12); the first nitrous oxide branch includes a connected nitrous oxide pipeline gas source (1), a filter (6), a low-pressure sensor (10), and a one-way valve (9); the second nitrous oxide branch includes a connected nitrous oxide high-pressure cylinder (2), a filter (6), a high-pressure sensor (8), a second high-pressure pressure reducer (11), and a one-way valve (9); the one-way valve (9) of the first nitrous oxide branch and the one-way valve (9) of the second nitrous oxide branch are both connected to the pressure reducing valve (12); The air assembly includes a connected air duct air source (3), a filter (6), a low-pressure sensor (10), a one-way valve (9), and a pressure reducing valve (12). The oxygen assembly includes a first oxygen branch, a second oxygen branch, and the pressure reducing valve (12); the first oxygen branch includes a connected oxygen pipeline gas source (4), the filter (6), the low-pressure sensor (10), and the one-way valve (9); the second oxygen branch includes a connected high-pressure oxygen cylinder (5), the filter (6), the high-pressure sensor (8), the first high-pressure pressure reducer (7), and the one-way valve (9); the one-way valve (9) of the first oxygen branch and the one-way valve (9) of the second oxygen branch are both connected to the pressure reducing valve (12).

3. The anesthesia machine according to claim 1, characterized in that, The first flow control branch is connected to the nitrous oxide assembly or the air assembly, and the second flow control branch is connected to the oxygen assembly; The first flow control branch includes a solenoid valve (15), a proportional valve (16), and an electronic flow meter (17) respectively connected to the nitrous oxide assembly and the air assembly, so as to connect the first flow control branch to the nitrous oxide assembly or the air assembly by controlling the opening and closing of the solenoid valve (15). The second flow control branch includes the solenoid valve (15), the proportional valve (16), and the electronic flow meter (17) connected to the oxygen assembly. In the first flow control branch and the second flow control branch, the outlet of the solenoid valve (15) and the inlet of the proportional valve (16) are directly opposite each other, and the outlet diameter of the solenoid valve (15) is larger than the outlet diameter of the proportional valve (16).

4. The anesthesia machine according to claim 3, characterized in that, The bypass valve (23) is connected to the first flow control branch and the second flow control branch, respectively.

5. The anesthesia machine according to claim 1, characterized in that, The inhalation branch includes an inhalation pressure differential assembly (41), a first airway pressure sensor (47), a second airway pressure sensor (60), an inhalation one-way valve (38), and a soda lime container (37). One end of the inspiratory pressure differential assembly (41) is connected to the patient (42), and the other end is connected to one end of the inspiratory one-way valve (38). The first airway pressure sensor (47) and the second airway pressure sensor (60) are disposed between the inspiratory pressure differential assembly (41) and the inspiratory one-way valve (38). The other end of the inspiratory one-way valve (38) is connected to the auxiliary fresh gas outlet switch (36) and the other end is connected to one end of the soda lime container (37). The other end of the soda lime container (37) is connected to the automatic assisted breathing branch and the manual assisted breathing branch, respectively. The expiratory branch includes an expiratory pressure differential assembly (40), an expiratory pressure sensor (53), and an expiratory one-way valve (39). One end of the expiratory pressure differential assembly (40) is connected to the patient (42), and the other end is connected to the expiratory one-way valve (39). The expiratory pressure sensor (53) is disposed between the expiratory pressure differential assembly (40) and the expiratory one-way valve (39). The expiratory one-way valve (39) is connected to the automatic assisted breathing branch and the manual assisted breathing branch, respectively. The paramagnetic oxygen sensor (44) and the anesthetic gas concentration detection component (43) are respectively connected to the inspiratory branch and the expiratory branch.

6. The anesthesia machine according to claim 5, characterized in that, The inspiratory differential pressure assembly (41) includes a first solenoid valve (54), a second solenoid valve (55), and an inspiratory flow sensor (58); the expiratory differential pressure assembly (40) includes a third solenoid valve (56), a fourth solenoid valve (57), and an expiratory flow sensor (59).

7. The anesthesia machine according to claim 1, characterized in that, The automatic assisted breathing branch includes a driving gas selector switch (13) for selecting the driving gas, a pressure reducing valve (26), a driving gas pressure sensor (52), a gas path module assembly, a gas resistance (29), an IP valve (30), an exhalation valve (32), an exhaust gas treatment device (48), and a coil (34) for automatic assisted breathing; The first end of the drive gas switching switch (13) is connected to the oxygen assembly, the second end is placed in the air, and the third end is connected to one end of the pressure reducing valve (26); the other end of the pressure reducing valve (26) is connected to the first end of the gas path module assembly, the second end of the gas path module assembly is connected to one end of the gas resistance (29), and the third end is connected to the coil (34); the coil (34) is connected to the manual control switching switch (35); the drive gas pressure sensor (52) is located between the pressure reducing valve (26) and the gas path module assembly; one end of the exhalation valve (32) is located between the gas path module assembly and the coil (34), and the other end is connected to the waste gas treatment device (48); the other end of the gas resistance (29) is connected to one end of the IP valve (30), and the other end of the IP valve (30) is placed in the air; The manual assisted breathing circuit includes a cuff (45) and a pressure limiting valve (33) for artificial assisted breathing; The IP valve has a gas-filled space at the front end of its valve port.

8. The anesthesia machine according to claim 7, characterized in that, The air circuit module assembly includes an intake valve (28), a filter (6), a flow sensor (51), a safety valve (31), and a solenoid valve (27); one end of the intake valve (28) is connected to the pressure reducing valve (26), and the other end is connected to one end of the filter (6); the other end of the filter (6) is connected to one end of the flow sensor (51), and the other end of the flow sensor (51) is connected to the coil (34); the flow sensor (31) is disposed between the flow sensor (51) and the coil (34); one end of the solenoid valve (27) is connected to the pressure reducing valve (26), and the other end is connected to one end of the air resistance (29).

9. The anesthesia machine according to claim 1, characterized in that, It also includes an oxygen therapy component and a safety oxygen component, the oxygen therapy component being connected to the oxygen component for providing auxiliary oxygen supply, the oxygen therapy component including a rotary flow regulating valve (19) and a 60L flow meter (18).

10. The anesthesia machine according to claim 1, characterized in that, It also includes a rapid oxygen supply component (22), one end of which is connected to the oxygen component and the other end is connected to the anesthetic gas delivery system for diluting the concentration of anesthetic gas.

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