Nitrous oxide analgesia gas circuit and nitrous oxide analgesia device

Abstract

The utility model belongs to the technical field of laughing gas analgesia devices, and particularly relates to a laughing gas analgesia gas circuit and a laughing gas analgesia device. An oxygen gas circuit is provided with an oxygen inlet used for being connected with a high-pressure oxygen gas source, and the end, away from the oxygen inlet, of the oxygen gas circuit is connected with a differential pressure assembly; the laughing gas path is provided with a laughing gas inlet used for being connected with a high-pressure laughing gas source, the end, away from the laughing gas inlet, of the laughing gas path is connected with the differential pressure assembly, the differential pressure assembly is connected with the mixed gas path, the rapid oxygen supply gas path comprises a rapid oxygen supply valve, and the rapid oxygen supply valve is connected between the laughing gas inlet and the mixed gas path. And when the quick oxygen supply valve is opened, oxygen in the oxygen path can be directly conveyed to the mixed gas path. When the rapid oxygen supply valve is opened, pure oxygen in the oxygen gas path can bypass the pressure difference assembly to be directly conveyed into the mixed gas path and is conveyed to a patient through the mixed gas path, and after the patient receives the pure oxygen, the laughing gas concentration in the body can be rapidly reduced, and the patient is helped to be rapidly sober.

Description

Technical Field

[0001] The utility model belongs to the technical field of nitrous oxide analgesia devices, and particularly relates to a nitrous oxide analgesia gas path and a nitrous oxide analgesia device. Background Art

[0002] A nitrous oxide analgesia device is a medical device that delivers a certain concentration of nitrous oxide to a patient's lungs to achieve a sedative effect. By adjusting the ratio and concentration of oxygen and nitrous oxide, the patient can reach the corresponding sedative state.

[0003] An existing nitrous oxide analgesia device includes a nitrous oxide gas path, an oxygen gas path, a mixing gas chamber, and a nasal mask. The nasal mask is connected to the mixing gas chamber. The nitrous oxide gas path delivers nitrous oxide to the mixing gas chamber, and the oxygen gas path delivers oxygen to the mixing gas chamber. After nitrous oxide and oxygen are mixed in the mixing gas chamber, the mixed gas is delivered to the patient's body through the nasal mask.

[0004] For the existing nitrous oxide analgesia device, although it can provide a mixed gas of a certain concentration of nitrous oxide and oxygen for the patient's analgesia during the operation, after the operation, the nitrous oxide in the patient's body cannot be dissipated in time, and still has an effect on the patient, affecting the patient's postoperative wakefulness. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is: aiming at the problem that the nitrous oxide input into the patient's body by the existing nitrous oxide analgesia device cannot be dissipated in time, thus affecting the patient's postoperative wakefulness, a nitrous oxide analgesia gas path and a nitrous oxide analgesia device are provided.

[0006] To solve the above technical problem, on the one hand, an embodiment of the utility model provides a nitrous oxide analgesia device, including a nitrous oxide gas path, an oxygen gas path, a rapid oxygen supply path, a pressure difference component, and a mixed gas path. The oxygen gas path has an oxygen inlet for connecting to a high-pressure oxygen gas source. One end of the oxygen gas path away from the oxygen inlet is connected to the pressure difference component. The nitrous oxide gas path has a nitrous oxide inlet for connecting to a high-pressure nitrous oxide gas source. One end of the nitrous oxide gas path away from the nitrous oxide inlet is connected to the pressure difference component. The pressure difference component is connected to the mixed gas path. The pressure difference component is used to detect and adjust the oxygen pressure in the oxygen gas path and the nitrous oxide pressure in the nitrous oxide gas path. The mixed gas path is used to connect to the patient;

[0007] The rapid oxygen supply path includes a rapid oxygen supply valve. The rapid oxygen supply valve is connected between the nitrous oxide inlet and the mixed gas path. When the rapid oxygen supply valve is opened, it can directly deliver the oxygen in the oxygen gas path to the mixed gas path.

[0008] Optionally, the differential pressure assembly includes a pressure regulating module, and the pressure regulating module includes an oxygen flow regulating valve and an oxygen flow meter. The oxygen flow meter is connected between the oxygen inlet and the mixed gas gas path, and the oxygen flow regulating valve is connected between the oxygen inlet and the oxygen flow meter;

[0009] The pressure regulating module includes a nitrous oxide flow regulating valve and a nitrous oxide flow meter. The nitrous oxide flow meter is connected between the nitrous oxide inlet and the mixed gas gas path, and the nitrous oxide flow regulating valve is connected between the nitrous oxide inlet and the nitrous oxide flow meter.

[0010] Optionally, the differential pressure assembly further includes a high-pressure relief valve. The high-pressure relief valve is a normally closed valve and is connected to the oxygen gas path. The high-pressure relief valve is used to open when the oxygen pressure in the oxygen gas path is higher than the high-pressure set value and discharge the oxygen in the oxygen gas path.

[0011] Optionally, the differential pressure assembly further includes an alarm. The alarm is connected to the oxygen gas path and is used to give an alarm when the oxygen pressure in the oxygen gas path is higher than the high-pressure set value.

[0012] Optionally, the alarm is an alarm whistle, and the alarm whistle is connected to the high-pressure relief valve. The high-pressure relief valve is used to open when the oxygen pressure in the oxygen gas path is higher than the high-pressure set value, so that the oxygen blows the alarm whistle.

[0013] Optionally, the differential pressure assembly further includes a low-pressure relief valve. The low-pressure relief valve is a normally open valve and is connected between the alarm whistle and the oxygen gas path. The low-pressure relief valve is used to close when the oxygen pressure in the oxygen gas path is higher than the low-pressure set value.

[0014] Optionally, the differential pressure assembly further includes a differential pressure relief valve. The differential pressure relief valve is connected between the nitrous oxide inlet and the alarm whistle, and is also connected between the oxygen inlet and the alarm whistle. The differential pressure relief valve is a normally closed valve and is used to open when the differential pressure between the oxygen in the oxygen gas path and the nitrous oxide in the nitrous oxide gas path is higher than the differential pressure set value.

[0015] Optionally, the differential pressure assembly further includes a differential pressure shut-off valve. The differential pressure shut-off valve is connected between the nitrous oxide inlet and the nitrous oxide flow regulating valve, and is also connected between the oxygen inlet and the oxygen flow regulating valve. The differential pressure shut-off valve is a normally closed valve and is used to open when the oxygen pressure in the oxygen gas path is lower than the low-pressure set value to cut off the nitrous oxide in the nitrous oxide gas path.

[0016] Optionally, the oxygen gas path further includes an oxygen outlet, which is connected between the oxygen inlet and the differential pressure component, and the oxygen outlet is used to export the oxygen in the oxygen gas path.

[0017] For the nitrous oxide analgesia device according to the embodiment of the present invention, when the rapid oxygen supply valve is opened, pure oxygen in the oxygen gas path can bypass the differential pressure component and be directly transported to the mixed gas path, and then be transported to the patient by the mixed gas path. After receiving the pure oxygen, the patient can quickly reduce the nitrous oxide concentration in the body and help the patient wake up quickly.

[0018] On the other hand, the embodiment of the present invention provides a nitrous oxide analgesia device, which includes a housing and the above-mentioned nitrous oxide analgesia gas path. An installation cavity is provided in the housing, and the nitrous oxide analgesia gas path is installed in the installation cavity. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the principle of the nitrous oxide analgesia gas path provided by an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the nitrous oxide analgesia device provided by an embodiment of the present invention;

[0021] Figure 3 For Figure 2 Partial structure diagram;

[0022] Figure 4 For Figure 2 Another perspective;

[0023] Figure 5 For Figure 2 Another perspective.

[0024] The reference numerals in the specification are as follows: 1. Oxygen gas path; 2. Oxygen inlet; 3. Oxygen filter; 4. Oxygen pressure gauge; 5. Oxygen flow regulating valve; 6. Oxygen flow meter; 7. Nitrous oxide gas path; 8. Nitrous oxide inlet; 9. Nitrous oxide filter; 10. Nitrous oxide pressure gauge; 11. Differential pressure cut-off valve; 12. Nitrous oxide flow regulating valve; 13. Nitrous oxide flow meter; 14. High-pressure relief valve; 15. Low-pressure relief valve; 16. Differential pressure relief valve; 17. Alarm whistle; 18. Rapid oxygen supply valve; 19. Mixed gas path; 20. Mechanical safety valve; 21. Interface; 22. Airbag; 23. Oxygen outlet; 24. Housing; 25. Bracket; 26. First oxygen pipe; 27. Second oxygen pipe; 28. Third oxygen pipe; 29. First nitrous oxide pipe; 30. Second nitrous oxide pipe; 31. Third nitrous oxide pipe; 32. Mixed gas pipe; 33. Rapid oxygen supply pipe. Detailed Embodiments

[0025] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] As Figure 1 shown, an embodiment of the present utility model provides a nitrous oxide analgesia gas path, which includes a nitrous oxide gas path 7, an oxygen gas path 1, a rapid oxygen supply gas path, a differential pressure component and a mixed gas gas path 19. The oxygen gas path 1 has an oxygen inlet 2 for connecting to a high-pressure oxygen gas source. One end of the oxygen gas path 1 away from the oxygen inlet 2 is connected to the differential pressure component. The nitrous oxide gas path 7 has a nitrous oxide inlet 8 for connecting to a high-pressure nitrous oxide gas source. One end of the nitrous oxide gas path 7 away from the nitrous oxide inlet 8 is connected to the differential pressure component. The differential pressure component is connected to the mixed gas gas path 19. The differential pressure component is used to detect and adjust the oxygen pressure in the oxygen gas path 1 and the nitrous oxide pressure in the nitrous oxide gas path 7. The mixed gas gas path 19 is used to connect to a patient.

[0027] The rapid oxygen supply gas path includes a rapid oxygen supply valve 18. The rapid oxygen supply valve 18 is connected between the nitrous oxide inlet 8 and the mixed gas gas path 19. When the rapid oxygen supply valve 18 is opened, it can directly transport the oxygen in the oxygen gas path 1 to the mixed gas gas path 19.

[0028] In one embodiment, the differential pressure component includes a pressure adjustment module. The pressure adjustment module includes an oxygen flow regulating valve 5 and an oxygen flow meter 6. The oxygen flow meter 6 is connected between the oxygen inlet 2 and the mixed gas gas path 19. The oxygen flow regulating valve 5 is connected between the oxygen inlet 2 and the oxygen flow meter 6.

[0029] The oxygen gas path 1 further includes an oxygen filter 3 and an oxygen pressure gauge 4 connected between the oxygen inlet 2 and the oxygen flow regulating valve 5. The oxygen flow regulating valve 5 can adjust the oxygen flow in the oxygen gas path 1, thereby controlling the oxygen pressure in the oxygen gas path 1.

[0030] The pressure adjustment module includes a nitrous oxide flow regulating valve 12 and a nitrous oxide flow meter 13. The nitrous oxide flow meter 13 is connected between the nitrous oxide inlet 8 and the mixed gas gas path 19. The nitrous oxide flow regulating valve 12 is connected between the nitrous oxide inlet 8 and the nitrous oxide flow meter 13.

[0031] The nitrous oxide gas path 7 further includes a nitrous oxide filter 9 and a nitrous oxide pressure gauge 10 connected between the nitrous oxide inlet 8 and the nitrous oxide flow regulating valve 12. The nitrous oxide flow regulating valve 12 can regulate the nitrous oxide flow in the nitrous oxide gas path 7, thereby controlling the nitrous oxide pressure in the nitrous oxide gas path 7, and further controlling the concentration of nitrous oxide in the mixed gas gas path 19.

[0032] In one embodiment, the differential pressure assembly further includes a high-pressure relief valve 14. The high-pressure relief valve 14 is a normally closed valve. The high-pressure relief valve 14 is connected to the oxygen gas path 1. The high-pressure relief valve 14 is used to open when the oxygen pressure in the oxygen gas path 1 is higher than the high-pressure set value, and discharge the oxygen in the oxygen gas path 1.

[0033] The high-pressure relief valve 14 is a normally closed valve. When the pressure in the oxygen gas path 1 is higher than the high-pressure set value, the high-pressure relief valve 14 opens, and the oxygen in the oxygen gas path 1 is discharged through the high-pressure relief valve 14, which can prevent the oxygen pressure in the oxygen gas path 1 from being too high.

[0034] In one embodiment, the differential pressure assembly further includes an alarm. The alarm is connected to the oxygen gas path 1. The alarm is used to give an alarm when the oxygen pressure in the oxygen gas path 1 is higher than the high-pressure set value.

[0035] The alarm is an alarm whistle 17. The alarm whistle 17 is connected to the high-pressure relief valve 14. The high-pressure relief valve 14 is used to open when the oxygen pressure in the oxygen gas path 1 is higher than the high-pressure set value, so that the oxygen blows the alarm whistle 17.

[0036] In this embodiment, the alarm whistle 17 is connected to the high-pressure relief valve 14. When the oxygen pressure in the oxygen gas path 1 is too high, the high-pressure relief valve 14 opens, and the oxygen in the oxygen gas path 1 passes through the high-pressure relief valve 14 to the flow alarm whistle 17 and is discharged to the outside through the alarm whistle 17. The alarm whistle 17 is blown by the discharged oxygen to give an alarm to the medical staff. The alarm whistle 17 and the high-pressure relief valve 14 are connected in the same gas path, which simplifies the gas path structure and is convenient for design.

[0037] In one embodiment, the differential pressure assembly further includes a low-pressure relief valve 15. The low-pressure relief valve 15 is a normally open valve. The low-pressure relief valve 15 is connected between the alarm whistle 17 and the oxygen gas path 1. The low-pressure relief valve 15 is used to close when the oxygen pressure in the oxygen gas path 1 is higher than the low-pressure set value.

[0038] The low-pressure relief valve 15 is a normally open valve. When the oxygen pressure in the oxygen gas path 1 is lower than the low-pressure set value, the oxygen in the oxygen gas path 1 is transmitted to the position of the alarm whistle 17 through the low-pressure relief valve 15, and the alarm whistle 17 gives an alarm. When the oxygen pressure is higher than the low-pressure set value, the low-pressure relief valve 15 closes and the alarm whistle 17 stops alarming.

[0039] In one embodiment, the differential pressure assembly further includes a differential pressure relief valve 16. The differential pressure relief valve 16 is connected between the nitrous oxide inlet 8 and the alarm whistle 17, and the differential pressure relief valve 16 is connected between the oxygen inlet 2 and the alarm whistle 17. The differential pressure relief valve 16 is a normally closed valve, and the differential pressure relief valve 16 is configured to open when the pressure difference between the oxygen in the oxygen gas path 1 and the nitrous oxide in the nitrous oxide gas path 7 is higher than a differential pressure set value.

[0040] The differential pressure relief valve 16 is a normally closed valve. The differential pressure relief valve 16 can open when the pressure difference between the oxygen in the oxygen gas path 1 and the nitrous oxide in the nitrous oxide gas path 7 is higher than the differential pressure set value, which can prevent the nitrous oxide concentration in the mixed gas gas path 19 from being too low and is beneficial to ensuring the analgesic effect of the nitrous oxide analgesic gas path.

[0041] In one embodiment, the differential pressure assembly further includes a differential pressure stop valve 11. The differential pressure stop valve 11 is connected between the nitrous oxide inlet 8 and the nitrous oxide flow regulating valve 12, and the differential pressure stop valve 11 is connected between the oxygen inlet 2 and the oxygen flow regulating valve 5. The differential pressure stop valve 11 is a normally closed valve, and the differential pressure stop valve 11 is configured to open when the oxygen pressure in the oxygen gas path 1 is lower than a low pressure set value to cut off the nitrous oxide in the nitrous oxide gas path 7.

[0042] The differential pressure stop valve 11 is a normally closed valve. The differential pressure stop valve 11 is configured to open when the oxygen pressure in the oxygen gas path 1 is lower than the low pressure set value to cut off the nitrous oxide in the nitrous oxide gas path 7, preventing the nitrous oxide concentration in the mixed gas gas path 19 from being too high and thus harming the physical health of the patient.

[0043] In one embodiment, the oxygen gas path 1 further includes an oxygen outlet 23. The oxygen outlet 23 is connected between the oxygen inlet 2 and the differential pressure assembly, and the oxygen outlet 23 is configured to export the oxygen in the oxygen gas path 1.

[0044] The oxygen outlet 23 is externally connected to the oxygen gas path 1 and can export the oxygen in the oxygen gas path 1 for other uses.

[0045] In one embodiment, the nitrous oxide analgesic gas path further includes an airbag 22. The airbag 22 is used to be connected to the patient and receive the waste gas exhaled by the patient. A mechanical safety valve 20 is further provided on the mixed gas gas path 19.

[0046] The working principle of the nitrous oxide analgesia gas circuit according to the embodiment of the present utility model is as follows: When the oxygen in the oxygen gas source is insufficient, the low-pressure relief valve 15 remains in the open state all the time, so that the alarm whistle 17 whistles continuously. When the oxygen is replaced and the pressure of the oxygen is higher than the low-pressure set value, the low-pressure relief valve 15 closes. When the pressure of the oxygen in the oxygen gas circuit 1 is higher than the high-pressure set value, the high-pressure relief valve 14 opens, so that the oxygen in the oxygen gas circuit 1 passes through the high-pressure relief valve 14 and is discharged from the alarm whistle 17, generating a whistle to remind medical staff, so that the oxygen is not lower than the low-pressure set value and not higher than the high-pressure set value. In addition, when the pressure difference between the oxygen in the oxygen gas circuit 1 and the nitrous oxide in the nitrous oxide gas circuit 7 is higher than the pressure difference set value, the pressure difference relief valve 16 opens, so that the oxygen in the oxygen gas circuit 1 passes through the pressure difference relief valve 16 and is discharged from the alarm whistle 17. In addition, when the pressure of the oxygen in the oxygen gas circuit 1 is lower than the low-pressure set value, the pressure difference cut-off valve 11 cuts off the passage between the nitrous oxide entering the inhalation gas circuit, reducing the nitrous oxide delivery and avoiding too high a nitrous oxide concentration.

[0047] According to the nitrous oxide analgesia device of the embodiment of the present utility model, when the fast oxygen supply valve 1818 is opened, the pure oxygen in the oxygen gas circuit 1 can bypass the pressure difference component and be directly delivered to the mixed gas gas circuit 19, and is delivered to the patient by the mixed gas gas circuit 19. After receiving the pure oxygen, the patient can quickly reduce the nitrous oxide concentration in the body and help the patient wake up quickly.

[0048] In addition, an embodiment of the present utility model also provides a nitrous oxide analgesia device, as Figures 2 to 5 shown, the nitrous oxide analgesia device includes a housing 24 and the above-mentioned nitrous oxide analgesia gas circuit, and an installation cavity is provided in the housing 24, and the nitrous oxide analgesia gas circuit is installed in the installation cavity.

[0049] The nitrous oxide analgesia device includes a first box body and a second box body. The low-pressure relief valve 15, the high-pressure relief valve 14, the differential pressure relief valve 16 and the differential pressure cut-off valve 11 are all installed in the first box body. The oxygen gas path 1 includes a first oxygen pipe 26, a second oxygen pipe 27 and a third oxygen pipe 28. The first oxygen pipe 26 connects the oxygen inlet 2 to the low-pressure relief valve 15, the high-pressure relief valve 14 and the differential pressure relief valve 16 in the first box body. In the first box body, through the internal pipeline in the first box body, the low-pressure relief valve 15, the high-pressure relief valve 14 and the differential pressure relief valve 16 are all connected to the alarm whistle 17. The rapid oxygen supply valve 18 is installed on the first box body. The second oxygen pipe 27 connects the first box body and the second box body. The oxygen flow regulating valve 5 and the oxygen flow meter 6 are both installed on the second box body. The oxygen flow regulating valve 5 is connected to the second box body. The second oxygen pipe 27 transports oxygen through the second box body to the oxygen flow regulating valve 5, and then is transported by the oxygen flow regulating valve 5 to the oxygen flow meter 6, and then is transported through the oxygen flow meter 6 to the mixed gas pipe 32, and is supplied to the patient through the interface 21 of the mixed gas pipe 32. The third oxygen pipe 28 connects the first box body and the oxygen pressure gauge 4.

[0050] The nitrous oxide gas path 7 includes a first nitrous oxide pipe 29, a second nitrous oxide pipe 30 and a third nitrous oxide pipe 31. The first nitrous oxide pipe 29 passes through the first box body to connect the nitrous oxide inlet 8 to the differential pressure cut-off valve 11 in the first box body. The second nitrous oxide pipe 30 connects the differential pressure cut-off valve 11 in the first box body and the second box body. The nitrous oxide flow regulating valve 12 and the nitrous oxide flow meter 13 are both installed on the second box body. The nitrous oxide flow regulating valve 12 is connected to the second box body. The second nitrous oxide pipe 30 transports nitrous oxide through the second box body to the nitrous oxide flow regulating valve 12, and then is transported by the nitrous oxide flow regulating valve 12 to the nitrous oxide flow meter 13, and then is transported through the nitrous oxide flow meter 13 to the mixed gas pipe 32, and is supplied to the patient through the interface 21 of the mixed gas pipe 32. The third nitrous oxide pipe 31 connects the first box body and the nitrous oxide pressure gauge 10.

[0051] The rapid oxygen supply gas path further includes a rapid oxygen supply pipe 33. The rapid oxygen supply pipe 33 connects the first box body and the mixed gas pipe 32. When the rapid oxygen supply valve 18 is opened, the oxygen in the first box body is directly transported through the rapid oxygen supply to the mixed gas pipe 32 and supplied to the patient.

[0052] The nitrous oxide analgesia device further includes a bracket 25 for installing on a trolley.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A nitrous oxide analgesia gas circuit, characterized in that, It includes a nitrous oxide gas path (7), an oxygen gas path (1), a rapid oxygen supply gas path, a differential pressure component, and a mixed gas gas path (19). The oxygen gas path (1) has an oxygen inlet (2) for connecting to a high-pressure oxygen gas source. One end of the oxygen gas path (1) away from the oxygen inlet (2) is connected to the differential pressure component. The nitrous oxide gas path (7) has a nitrous oxide inlet (8) for connecting to a high-pressure nitrous oxide gas source. One end of the nitrous oxide gas path (7) away from the nitrous oxide inlet (8) is connected to the differential pressure component. The differential pressure component is connected to the mixed gas gas path (19). The differential pressure component is used to detect and adjust the oxygen pressure in the oxygen gas path (1) and the nitrous oxide pressure in the nitrous oxide gas path (7). The mixed gas gas path (19) is used to connect to a patient. The rapid oxygen supply gas path includes a rapid oxygen supply valve (18). The rapid oxygen supply valve (18) is connected between the nitrous oxide inlet (8) and the mixed gas gas path (19). When the rapid oxygen supply valve (18) is opened, it can directly transport the oxygen in the oxygen gas path (1) to the mixed gas gas path (19).

2. The nitrous oxide analgesia gas circuit according to claim 1, characterized in that, The differential pressure component includes a pressure regulation module. The pressure regulation module includes an oxygen flow regulating valve (5) and an oxygen flow meter (6). The oxygen flow meter (6) is connected between the oxygen inlet (2) and the mixed gas gas path (19). The oxygen flow regulating valve (5) is connected between the oxygen inlet (2) and the oxygen flow meter (6). The pressure regulation module includes a nitrous oxide flow regulating valve (12) and a nitrous oxide flow meter (13). The nitrous oxide flow meter (13) is connected between the nitrous oxide inlet (8) and the mixed gas gas path (19). The nitrous oxide flow regulating valve (12) is connected between the nitrous oxide inlet (8) and the nitrous oxide flow meter (13).

3. The nitrous oxide analgesia gas circuit according to claim 2, characterized in that, The differential pressure component further includes a high-pressure relief valve (14). The high-pressure relief valve (14) is a normally closed valve. The high-pressure relief valve (14) is connected to the oxygen gas path (1). The high-pressure relief valve (14) is used to open when the oxygen pressure in the oxygen gas path (1) is higher than the high-pressure set value and discharge the oxygen in the oxygen gas path (1).

4. The nitrous oxide analgesia gas circuit according to claim 3, characterized in that, The differential pressure component further includes an alarm. The alarm is connected to the oxygen gas path (1). The alarm is used to give an alarm when the oxygen pressure in the oxygen gas path (1) is higher than the high-pressure set value.

5. The nitrous oxide analgesia gas circuit according to claim 4, characterized in that, The alarm is an alarm whistle (17). The alarm whistle (17) is connected to the high-pressure relief valve (14). The high-pressure relief valve (14) is used to open when the oxygen pressure in the oxygen gas path (1) is higher than the high-pressure set value, so that the oxygen blows the alarm whistle (17).

6. The nitrous oxide analgesia gas circuit according to claim 5, wherein The differential pressure component further includes a low-pressure relief valve (15). The low-pressure relief valve (15) is a normally open valve. The low-pressure relief valve (15) is connected between the alarm whistle (17) and the oxygen gas path (1). The low-pressure relief valve (15) is used to close when the oxygen pressure in the oxygen gas path (1) is higher than the low-pressure set value.

7. The nitrous oxide analgesia gas circuit according to claim 6, characterized in that The differential pressure assembly further includes a differential pressure relief valve (16). The differential pressure relief valve (16) is connected between the nitrous oxide inlet (8) and the alarm whistle (17), and the differential pressure relief valve (16) is connected between the oxygen inlet (2) and the alarm whistle (17). The differential pressure relief valve (16) is a normally closed valve, and the differential pressure relief valve (16) is used to open when the differential pressure between the oxygen in the oxygen gas path (1) and the nitrous oxide in the nitrous oxide gas path (7) is higher than the differential pressure set value.

8. The nitrous oxide analgesia gas circuit according to claim 7, characterized in that, The differential pressure assembly further includes a differential pressure stop valve (11). The differential pressure stop valve (11) is connected between the nitrous oxide inlet (8) and the nitrous oxide flow regulating valve (12), and the differential pressure stop valve (11) is connected between the oxygen inlet (2) and the oxygen flow regulating valve (5). The differential pressure stop valve (11) is a normally closed valve, and the differential pressure stop valve (11) is used to open when the oxygen pressure in the oxygen gas path (1) is lower than the low pressure set value to cut off the nitrous oxide in the nitrous oxide gas path (7).

9. The nitrous oxide analgesia gas circuit according to claim 8, characterized in that, The oxygen gas path (1) further includes an oxygen outlet (23). The oxygen outlet (23) is connected between the oxygen inlet (2) and the differential pressure assembly, and the oxygen outlet (23) is used to export the oxygen in the oxygen gas path (1).

10. A nitrous oxide analgesia device, characterized in that, It includes a housing (24) and the nitrous oxide analgesia gas path according to any one of claims 1 to 9. An installation cavity is provided in the housing (24), and the nitrous oxide analgesia gas path is installed in the installation cavity.

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