Anesthesia machine and its APL valve

Abstract

The present invention discloses an anesthesia machine and an APL valve thereof, wherein the anesthesia machine comprises a breathing circuit, a fresh gas branch, a manually driven gas branch, a discharge branch and an APL valve, wherein the APL valve is installed in the manually driven gas branch to limit the gas pressure in the manually driven gas branch. The APL valve comprises a valve seat assembly, a pressure regulating assembly, a valve plate assembly and an elastic member, wherein the valve seat assembly is provided with an air inlet and an air outlet, wherein the air inlet is connected to the manually driven gas branch, and the air outlet is connected to the discharge branch, wherein the pressure regulating assembly can be movably installed on the valve seat assembly, wherein the valve plate assembly is slidably connected to the pressure regulating assembly and enclosed with the pressure regulating assembly to form an air cavity, wherein the valve plate assembly is used to control the on-off between the air inlet and the air outlet, wherein the elastic member is arranged in the air cavity, wherein the first end of the elastic member abuts the pressure regulating assembly, and the second end abuts the valve plate assembly, wherein the APL valve is further provided with a damping hole connecting the air cavity and the outside, wherein the damping hole is used for the discharge and inhalation of the gas inside the air cavity to suppress the resonance of the valve plate assembly.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, in particular to an anesthesia machine and an APL valve thereof. Background Art

[0002] APL valve is a commonly used valve in the field of anesthesia machines, mainly used for gas pressure control of manually driven gas branch of anesthesia machines. The principle is that the APL valve is provided with an air inlet and an air outlet, and the valve plate assembly seals the air inlet through the elastic force of the elastic member. When the pressure in the air inlet is greater than the elastic force of the elastic member, the gas pushes open the valve plate assembly and is discharged from the air outlet, thereby controlling the gas pressure in the manually driven gas branch.

[0003] Since the structure composed of the valve plate assembly and the elastic part is a typical spring oscillator system, the valve plate assembly opens and closes quickly when the airflow is released. When the opening and closing frequency of the valve plate assembly is close to the resonant frequency of the spring oscillator, abnormal vibration and noise will be generated, causing noise impact on the user. Summary of the invention

[0004] In view of this, the present invention provides an anesthesia machine and an APL valve thereof.

[0005] A first aspect of the present invention provides an anesthesia machine, comprising a breathing circuit, a fresh gas branch, a manually driven gas branch, an exhaust branch, and an APL valve, wherein the fresh gas branch is used to deliver fresh gas into the breathing circuit, the manually driven gas branch is used to push the fresh gas in the breathing circuit to the patient, and the APL valve is installed on the manually driven gas branch to limit the gas pressure in the manually driven gas branch, and the APL valve comprises:

[0006] A valve seat assembly, provided with an air inlet and an air outlet, wherein the air inlet is connected to the manual drive gas branch, and the air outlet is connected to the exhaust branch;

[0007] A pressure regulating assembly, movably mounted on the valve seat assembly;

[0008] A valve plate assembly, which is slidably connected to the pressure regulating assembly and encloses the pressure regulating assembly to form an air cavity, and the valve plate assembly is used to control the on-off between the air inlet and the air outlet;

[0009] An elastic member, disposed in the air cavity, the elastic member comprising a first end and a second end, the first end abutting against the pressure regulating assembly, and the second end abutting against the valve plate assembly;

[0010] The APL valve is further provided with a damping hole connecting the air cavity and the outside, and the damping hole is used for the discharge and suction of the gas inside the air cavity to suppress the resonance of the valve plate assembly.

[0011] A second aspect of the present invention provides an APL valve, comprising:

[0012] A valve seat assembly, provided with an air inlet and an air outlet, wherein the air inlet is used to be connected to a manual drive gas branch of the anesthesia machine, and the air outlet is used to be connected to a discharge branch of the anesthesia machine;

[0013] A pressure regulating assembly, movably mounted on the valve seat assembly;

[0014] A valve plate assembly, which is slidably connected to the pressure regulating assembly and encloses the pressure regulating assembly to form an air cavity, and the valve plate assembly is used to control the on-off between the air inlet and the air outlet;

[0015] An elastic member, disposed in the air cavity, the elastic member comprising a first end and a second end, the first end abutting against the pressure regulating assembly, and the second end abutting against the valve plate assembly;

[0016] The APL valve is further provided with a damping hole connecting the air cavity and the outside, and the damping hole is used for the discharge and suction of the gas inside the air cavity to suppress the resonance of the valve plate assembly.

[0017] It can be seen from the above technical solution that the anesthesia machine proposed in the first aspect of the present invention, by arranging a damping hole in the APL valve, the damping hole can effectively reduce the vibration frequency of the valve plate assembly and the elastic member by discharging the gas inside the air cavity or replenishing the gas into the air cavity, and inhibit the resonance of the valve plate assembly, thereby effectively reducing the noise generated during the operation of the valve plate assembly and reducing the impact of the noise on the patient's rest. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained like these accompanying drawings without paying any creative work.

[0019] Figure 1 It is a structural schematic diagram of an anesthesia machine proposed in one embodiment of the present invention;

[0020] Figure 2 yes Figure 1 The structural diagram of the APL valve is shown in FIG;

[0021] Figure 3 yes Figure 1 An exploded schematic diagram of the APL valve shown in;

[0022] Figure 4 yes Figure 2 Schematic diagram of the cross section of AA;

[0023] Figure 5 It is a cross-sectional schematic diagram of an APL valve proposed in another embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0026] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] like Figure 1 As shown, one embodiment of the present invention provides an anesthesia machine, which includes a breathing circuit 10, a fresh gas branch 20, a manually driven gas branch 30, an exhaust branch 40 and an APL valve 50. The fresh gas branch 20 is used to deliver fresh gas into the breathing circuit 10, the manually driven gas branch 30 is used to push the fresh gas in the breathing circuit 10 to the patient, and the APL valve 50 is installed on the manually driven gas branch 30 to limit the gas pressure in the manually driven gas branch 30.

[0028] Exemplarily, the breathing circuit 10 includes an air supply pipe 11, an air return pipe 12, an inhalation check valve 13, an exhalation check valve 14 and a carbon dioxide absorption tank 15. The inhalation check valve 13 is installed on the air supply pipe 11, the exhalation check valve 14 is installed on the air return pipe 12, the carbon dioxide absorption tank 15 is installed between the inhalation check valve 13 and the exhalation check valve 14, and the fresh gas branch 20 is installed between the carbon dioxide absorption tank 15 and the inhalation check valve 13. The manually driven gas branch 30 includes a first pipeline 31 and a manual air bag 32. The first pipeline 31 is connected to the exhalation check valve 14 and the carbon dioxide absorption tank 15, and the APL valve 50 is installed on the first pipeline 31.

[0029] When in use, the patient's exhaled gas passes through the exhalation one-way valve 14 and then enters the manual airbag 32 through the first pipeline 31. The operator presses the manual airbag 32, and the gas coming out of the manual airbag 32 drives the exhaled gas to the carbon dioxide absorption tank 15, where the carbon dioxide is absorbed. The gas coming out of the carbon dioxide absorption tank 15 is mixed with the fresh gas containing anesthetics through the fresh gas branch 20 and delivered to the patient, and the cycle repeats.

[0030] Optionally, the anesthesia machine further includes a machine-controlled driving gas branch 60 and a switching valve 70. The machine-controlled driving gas branch 60 includes a second pipeline 61, a bellows 62, and a folding airbag 63. The folding airbag 63 is connected to one end of the second pipeline 61, and the driving gas mechanism 100 is connected to the cavity enclosed by the bellows 62 and the folding airbag 63. One end of the first pipeline 31 and one end of the second pipeline 61 are both connected to the switching valve 70. The operator selectively uses the manual driving gas branch 30 or the machine-controlled driving gas branch 60 as the driving gas by operating the switching valve 70. Specifically, when the machine-controlled driving gas branch 60 is used as the driving gas, the gas exhaled by the patient enters the folding airbag 63 through the exhalation one-way valve 14 and the second pipeline 61, and the driving gas mechanism 100 provides driving gas to enter the cavity formed by the bellows 62 and the folding airbag 63. The driving gas compresses the folding airbag 63, thereby transporting the patient's exhaled gas to the carbon dioxide absorption tank 15 through the second pipeline. The carbon dioxide absorption tank 15 absorbs the carbon dioxide in the exhaled gas, and the gas coming out of the carbon dioxide absorption tank 15 is mixed with the fresh gas containing anesthetics through the fresh gas branch 20 and is transported to the patient through the gas supply pipeline 11, and this cycle is repeated.

[0031] like Figures 2 to 4 As shown, optionally, the APL valve 50 includes a valve seat assembly 51, a pressure regulating assembly 52, a valve plate assembly 53 and a first elastic member 54. The valve seat assembly 51 is provided with an air inlet 51a and an air outlet 51b. The air inlet 51a is connected to the manual drive gas branch 30, and the air outlet 51b is connected to the discharge branch 40. The pressure regulating assembly 52 can be movably mounted on the valve seat assembly 51. The valve plate assembly 53 is slidably connected to the pressure regulating assembly 52 and encloses the pressure regulating assembly 52 to form an air cavity 55. The valve plate assembly 53 is used to control the on-off between the air inlet 51a and the air outlet 51b. The first elastic member 54 is arranged in the air cavity 55. The first elastic member 54 includes a first end 54a and a second end 54b. The first end 54a abuts the pressure regulating assembly 52, and the second end 54b abuts the valve plate assembly 53. The APL valve 50 is also provided with a damping hole 56 connecting the air cavity 55 and the outside. The damping hole 56 is used for the discharge and intake of gas inside the air cavity 55 to suppress the resonance of the valve plate assembly 53.

[0032] When in use, the operator first adjusts the elastic force of the first elastic member 54 through the pressure regulating assembly 52. ​​When the gas pressure in the manually driven gas branch 30 is greater than the elastic force of the first elastic member 54, the gas in the manually driven gas branch 30 pushes the valve plate assembly 53 open and is discharged from the APL valve 50 to the discharge branch 40, so that the gas pressure in the manually driven gas branch 30 remains constant. In the process of the valve plate assembly 53 being pushed open, the valve plate assembly 53 compresses the air cavity 55, and the gas in the air cavity 55 is slowly discharged from the damping hole 56. In the process of the valve plate assembly 53 being reset, the air cavity 55 expands, and the external gas slowly enters the air cavity 55 from the damping hole 56, thereby reducing the speed of the valve plate assembly 53 moving up and down, achieving a damping effect, and avoiding the situation where the valve plate assembly 53 moves too fast and vibrates.

[0033] After adopting the above technical solution, by setting a damping hole 56 in the APL valve 50, the damping hole 56 can effectively reduce the vibration frequency of the valve plate assembly 53 and the first elastic member 54 by discharging the gas inside the air cavity 55 or replenishing the gas into the air cavity 55, and suppress the resonance of the valve plate assembly 53, thereby effectively reducing the noise generated during the operation of the valve plate assembly 53 and reducing the impact of the noise on the user.

[0034] Optionally, the pressure regulating assembly 52 includes a slide 521 and a knob 522. The slide 521 is disposed inside the valve seat assembly 51 and is connected to the valve seat assembly 51 by a spiral transmission. The valve plate assembly 53 is slidably mounted inside the slide 521 and enclosed with the slide 521 to form an air cavity 55. The knob 522 is connected to the slide 521. When the knob 522 rotates, the slide 521 is driven to rotate to adjust the compression of the first elastic member 54. For example, when the pressure of the valve plate assembly 53 needs to be increased, the operator rotates the knob 522, and the knob 522 drives the slide 521 to rotate. Since the slide 521 is connected to the valve seat assembly 51 by a spiral transmission, the slide 521 moves relative to the valve seat assembly 51 toward the first elastic member 54, thereby pressing the first elastic member 54, increasing the compression of the first elastic member 54, and increasing the pressure of the valve plate assembly 53. Conversely, when the pressure of the valve plate assembly 53 needs to be reduced, the operator reverses the knob 522.

[0035] Exemplarily, the inner wall of the sliding component 51 is provided with an internal thread, and the outer wall of the sliding cylinder 521 is provided with an external thread, and the sliding component 51 and the sliding cylinder 521 are connected by a spiral transmission through threaded cooperation.

[0036] In some other embodiments, one of the inner wall of the sliding component 51 and the outer wall of the slide cylinder 521 is provided with a spiral guide groove, and the other of the inner wall of the sliding component 51 and the outer wall of the slide cylinder 521 is provided with a guide block, and the guide block can be movably embedded in the spiral guide groove to realize a spiral transmission connection between the sliding component 51 and the slide cylinder 521.

[0037] Optionally, the slide 521 and the knob 522 are fastened together by a fastener 523. The relative positions of the slide 521 and the knob 522 remain fixed, and during the process of rotating the knob 522, the slide 521 and the knob 522 are synchronously displaced relative to the valve seat assembly 51.

[0038] Optionally, the valve plate assembly 53 includes a sliding member 531 and a valve plate 532. The sliding member 531 is slidably mounted inside the slide cylinder 521 and encloses the slide cylinder 521 to form an air cavity 55. The second end 54b of the first elastic member 54 abuts against the sliding member 531, and the valve plate 532 abuts against the sliding member 531. The elastic force of the first elastic member 54 is indirectly transmitted to the valve plate 532 through the sliding member 531. Of course, the sliding member 531 and the valve plate 532 are not limited to being arranged to abut against each other. For example, the sliding member 531 and the valve plate 532 can also be arranged to be integrally formed.

[0039] Optionally, the sliding member 531 is in a bowl shape, and the bowl-shaped sliding member 531 can form a larger contact surface with the inner wall of the slide cylinder 521, so that the sliding member 531 can slide smoothly. Of course, the shape of the sliding member 531 is not limited to being set as a bowl shape, for example, the sliding member 531 can also be set as a plate shape, which is determined according to actual design requirements.

[0040] It should be noted that the sliding member 531 is not limited to being disposed inside the slide cylinder 521 . For example, the sliding member 531 may also be slidably disposed outside the slide cylinder 521 .

[0041] Optionally, the slide 521 is made of any one of metal, glass, ceramic, polytetrafluoroethylene (PTFE), polyformaldehyde (POM), polyether-ether-ketone (PEEK) and graphite, or the inner wall of the slide 521 is provided with one of metal layer, glass layer, ceramic layer, polytetrafluoroethylene layer, polyformaldehyde layer, polyether-ether-ketone layer and graphite layer. Among them, polytetrafluoroethylene, polyformaldehyde, polyether-ether-ketone and graphite are wear-resistant and self-lubricating materials, which can extend the service life of the slide 521 and reduce the friction between the slide 521 and the sliding member 531, so that the operation between the slide 521 and the sliding member 531 is smooth.

[0042] Optionally, the sliding member 531 is a piston core made of any one of metal, glass, ceramic, polytetrafluoroethylene, polyoxymethylene, polyetheretherketone and graphite, or the outer wall of the sliding member 531 is provided with one of metal layer, glass layer, ceramic layer, polytetrafluoroethylene layer, polyoxymethylene layer, polyetheretherketone layer and graphite layer. Similarly, polytetrafluoroethylene, polyoxymethylene, polyetheretherketone and graphite are all wear-resistant and self-lubricating materials, which can extend the service life of the sliding member 531 and reduce the friction between the slide cylinder 521 and the sliding member 531, so that the slide cylinder 521 and the sliding member 531 can run smoothly.

[0043] Optionally, the valve seat assembly 51 includes a cartridge seat 511 and an adapter assembly 512, the slide cylinder 521 is disposed inside the cartridge seat 511 and is connected to the cartridge seat 511 by spiral transmission, the adapter assembly 512 is mounted on the bottom of the cartridge seat 511, the adapter is provided with an air inlet 51a and an air outlet 51b, and the valve plate assembly 53 covers the air inlet 51a of the adapter assembly 512. The spiral transmission connection between the cartridge seat 511 and the slide cylinder 521 can refer to the above-mentioned embodiment, and will not be described in detail here.

[0044] Optionally, the adapter assembly 512 includes a valve port member 5121 and a base adapter member 5122, the base adapter member 5122 is mounted on the bottom of the cartridge seat 511, the valve port member 5121 is mounted on the bottom of the base adapter member 5122, the air outlet 51b is provided on the base adapter member 5122, and the air inlet 51a is provided on the valve port member 5121. The valve plate assembly 53 covers the valve port member 5121, the air inlet 51a is not connected to the air outlet 51b, and when the valve plate assembly 53 is pushed open, the air inlet 51a is connected to the air outlet 51b.

[0045] Optionally, the APL valve 50 further includes an annular diaphragm 57, the outer side of the annular diaphragm 57 is connected to the valve seat assembly 51, the inner side of the annular diaphragm 57 is connected to the valve plate assembly 53, and the annular diaphragm 57 is used to block the patient's exhaled gas from entering the area enclosed by the valve seat assembly 51 and the annular diaphragm 57. Specifically, the outer side of the annular diaphragm 57 is connected to the cartridge seat 511, the inner side of the annular diaphragm 57 is connected to the valve plate assembly 53, and the annular diaphragm 57 is used to block the patient's exhaled gas from entering the cartridge seat 511. By providing the annular diaphragm 57, it is possible to avoid the patient's exhaled gas from entering the cartridge seat 511, which may corrode the slide 521 and the sliding member 531 and the damping hole 56, which require high matching accuracy, and cause the APL valve 50 to fail. Optionally, the inner side of the annular diaphragm 57 is connected to the valve plate 532.

[0046] Optionally, an outer wall of the valve plate 532 is provided with a mounting groove 5321 , the inner side of the annular diaphragm 57 is clamped in the mounting groove 5321 , and the outer side of the annular diaphragm 57 is clamped between the cylinder seat 511 and the base adapter 5122 .

[0047] Optionally, the APL valve 50 also includes a leakage self-checking component 58, which is used to detect the sealing of the manually driven gas branch 30. The leakage self-checking component 58 is slidably mounted on the pressure regulating component 52. Specifically, the leakage self-checking component 58 is slidably mounted on the knob 522. When the leakage self-checking component 58 is pressed by an external force, it moves toward the first elastic member 54 and resets when the external force is released. When in use, a gas with a certain pressure value is introduced into the manually driven gas branch 30, and the operator presses the leakage self-checking component 58 and maintains the pressure for a period of time. If the pressure value of the gas in the manually driven gas branch 30 does not weaken after maintaining the pressure for a period of time, or the pressure drops within a reasonable range, it means that there is no problem with the sealing of the manually driven gas branch 30. Otherwise, there is a problem with the sealing, which requires repair and replacement.

[0048] The existing APL valve 50 is implemented by adjusting the pressure regulating component 52 when performing a self-leakage test. For example, when performing a self-leakage test, the pressure of the valve plate component 53 needs to be adjusted to a pressure value of 30 cm of water column. After completing the self-leakage test, the operator needs to adjust the pressure of the valve plate component 53 back to the original pressure value, such as a pressure value of 20 cm of water column. However, when actually adjusting the pressure downward, it is often not possible to accurately adjust the pressure of the valve plate component 53 back to the original pressure value, which is either too high or too low. There may even be a situation where the pressure of the valve plate component 53 is forgotten to be adjusted back to the original pressure value, resulting in the anesthesia machine being unable to be used normally. In this embodiment, by providing a self-leakage test component 58, when a self-leakage test is required, it is only necessary to press the self-leakage test component 58, and release the self-leakage test component 58 after completing the self-leakage test, which not only avoids the trouble of adjusting the pressure regulating component 52 back and forth, but also avoids the situation where the pressure of the valve plate component 53 is forgotten to be adjusted back to the original pressure value.

[0049] Optionally, the leakage self-test component 58 includes a quick-lock button 581 and a quick-lock shaft 582. The quick-lock button 581 can be reset and installed on the knob 522. The quick-lock shaft 582 is connected to the quick-lock button 581. The quick-lock shaft 582 can be movably inserted into the interior of the slide tube 521. The quick-lock shaft 582 is used to squeeze the first elastic member 54 when the quick-lock button 581 is pressed by external force.

[0050] Optionally, the APL valve 50 also includes a second elastic member 59, which includes a first end 59a and a second end 59b. A connecting shaft 583 is provided in the middle of the quick lock button 581, and one end of the connecting shaft 583 away from the quick lock button 581 is connected to the quick lock shaft 582. The second elastic member 59 is sleeved on the connecting shaft 583, and the first end 59a of the second elastic member 59 abuts the quick lock button 581, and the second end 59b of the second elastic member 59 abuts the knob 522. The quick lock button 581 can be reset on the knob 522 through the second elastic member 59, that is, when the external force pressing the quick lock button 581 is removed, the quick lock button 581 can be reset by the elastic force of the second elastic member 59.

[0051] It should be noted that a limiting structure should be provided between the leakage self-checking component 58 and the pressure regulating component 52 to prevent the leakage self-checking component 58 from falling off from the pressure regulating component 52. Exemplarily, the outer wall of the quick lock shaft 582 away from the quick lock button 581 is provided with a flange structure 5821, and the inner wall of the slide 521 is provided with a step 5211, and the flange structure 5821 is clamped on the step 5211 to prevent the leakage self-checking component 58 from falling off from the pressure regulating component 52. In other embodiments, the knob 522 is provided with a first buckle portion, and the connecting shaft 583 is provided with a second buckle portion, and the first buckle portion and the second buckle portion are buckled together to prevent the leakage self-checking component 58 from falling off from the pressure regulating component 52.

[0052] Optionally, the damping hole 56 is provided on the slide cylinder 521. Of course, the damping hole 56 is not limited to being provided on the slide cylinder 521. For example, the damping hole 56 may be provided on the leakage self-checking assembly 58 or the valve plate assembly 53. For example, the damping hole 56 may be provided on the quick-locking shaft 582 or on the sliding member 531.

[0053] Optionally, the APL valve 50 further includes a first sealing ring 101, which is sandwiched between the slide cylinder 521 and the cartridge seat 511, and is used for sealing between the slide cylinder 521 and the cartridge seat 511. Optionally, at least one of the outer wall of the slide cylinder 521 and the inner wall of the cartridge seat 511 is provided with a first annular groove 102, and the first sealing ring 101 is embedded in the first annular groove 102.

[0054] Optionally, the APL valve 50 further includes a second sealing ring 103, which is sandwiched between the slide 521 and the quick-lock shaft 582, and is used for sealing between the slide 521 and the quick-lock shaft 582. Optionally, at least one of the inner wall of the slide 521 and the outer wall of the quick-lock shaft 582 is provided with a second annular groove 104, and the second sealing ring 103 is embedded in the second annular groove 104.

[0055] Optionally, the APL valve 50 further includes a third sealing ring 105, which is disposed on the outer side wall of the valve port 5121 and is used for sealing when the valve port 5121 is installed on the main body of the anesthesia machine. Optionally, the outer side wall of the valve port 5121 is provided with a third annular groove 106, and the third sealing ring 105 is embedded in the third annular groove 106.

[0056] Optionally, the APL valve 50 further includes a fourth sealing ring 107, which is disposed on the outer side wall of the cartridge seat 511 and is used for sealing when the cartridge seat 511 is installed on the main body of the anesthesia machine. Optionally, the outer side wall of the cartridge seat 511 is provided with a fourth annular groove 108, and the fourth sealing ring 107 is embedded in the fourth annular groove 108.

[0057] Optionally, the APL valve 50 also includes a limit pin 109, the cylinder seat 511 is provided with a pin hole 5111, the outer wall of the slide 521 is provided with a protrusion 5212, the limit pin 109 is passed through the pin hole 5111 and partially extends into the inner side of the slide 521, the part of the limit pin 109 extending into the inner side of the slide 521 abuts against the side of the protrusion 5212 facing the quick lock button 581, and the limit pin 109 is used to limit the stroke of the slide 521.

[0058] like Figure 4 and Figure 5 As shown, another embodiment of the present invention provides an anesthesia machine. The anesthesia machine provided in this embodiment is different from the anesthesia machine provided in the above embodiment in that: in this embodiment, the knob and the slide are not fastened together by fasteners. In this embodiment, the knob 522' is provided with a through hole 5221' in the axial direction of the slide 521', and the slide 521' is provided with an extension column 5211' extending in the axial direction, and the extension column 5211' can be movably inserted into the through hole 5221'. The knob 522' can be rotatably connected to the valve seat assembly 51'. For example, the inner side wall of the knob 522' is provided with a first protrusion 5222', and the outer side wall of the valve seat assembly 51' is provided with an annular groove 511', and the first protrusion 5222' is embedded in the annular groove 511'.

[0059] After adopting the above solution, the operation mode of the APL valve 50 ′ proposed in this embodiment is different from the operation mode of the APL valve 50 in the above embodiment in the following aspects.

[0060] First, in the APL valve 50 of the above embodiment, when the knob 522 is turned, the knob 522 and the slide 521 are synchronously displaced relative to the valve seat assembly 51. In this embodiment, when the knob 522' is turned, the relative position between the knob 522' and the valve seat assembly 51' remains unchanged, and the relative position between the slide 521' and the knob 522' changes.

[0061] Secondly, the APL valve 50' in this embodiment is also different from the APL valve 50 in the above embodiment when performing a self-leakage test. In the APL valve 50 in the above embodiment, since the relative position between the quick lock button 581 and the slide 521 remains unchanged, when the quick lock button 581 is pressed, the stroke of the quick lock button 581 is directly superimposed on the compression of the first elastic member 54. For example, in a normal working state, the compression of the first elastic member 54 is equivalent to a pressure value of 20 cm of water column, and the compression formed by the stroke of the quick lock button 581 on the first elastic member 54 is equivalent to a pressure value of 30 cm of water column. When the quick lock button 581 is pressed, the pressure value of the valve plate assembly 53 is equivalent to a pressure value of 50 cm of water column, and the valve plate assembly 53 performs a self-leakage test when the pressure value is equivalent to a pressure value of 50 cm of water column. In the present embodiment, since the relative position between the quick lock button 581' and the slide 521' can be changed, when the quick lock button 581' is pressed, the stroke of the quick lock button 581' may be completely superimposed on the first elastic member 54', partially superimposed on the first elastic member 54', or not superimposed on the first elastic member 54'. For example, the amount of compression caused by the stroke of the quick lock button 581' on the first elastic member 54' is equivalent to a pressure value of 30 cm of water column. When working in a normal state, the amount of compression of the elastic member is greater than or equal to a pressure value of 30 cm of water column. When the quick lock button 581' is pressed, the quick lock shaft 582' cannot contact the first elastic member 54', and the valve plate assembly 53' performs a leakage self-check when the pressure value is equivalent to a pressure value of 30 cm of water column.

[0062] It should be noted that the knob 522' and the slide 521' are not limited to the way of cooperating with the through hole 5221' and the extension column 5211' to achieve that when the knob 522' is rotated, the relative position between the knob 522' and the valve seat assembly 51' remains unchanged, while the relative position between the slide 521' and the knob 522' changes.

[0063] For example, in some other embodiments, one of the knob 522' and the slide 521' is provided with a slide groove along the axial direction of the slide 521', and the other of the knob 522' and the slide 521' is provided with a slider, which can be slidably embedded in the slide groove. When the knob 522' is turned, the slide 521' can achieve displacement along the axial direction of the slide 521' under the cooperation between the slider and the slide groove and the cooperation of the above-mentioned spiral transmission connection.

[0064] The structures and connection relationships of other components of the anesthesia machine proposed in this embodiment can refer to the above embodiments and will not be described in detail here.

[0065] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An anesthesia machine, characterized in that: The invention comprises a breathing circuit, a fresh gas branch, a manually driven gas branch, an exhaust branch and an APL valve, wherein the breathing circuit comprises a carbon dioxide absorption tank, the fresh gas branch is used to deliver fresh gas into the breathing circuit, the manually driven gas branch is used to push the fresh gas in the breathing circuit to the patient, the APL valve is installed on the manually driven gas branch to limit the gas pressure in the manually driven gas branch, and the APL valve comprises: A valve seat assembly, provided with an air inlet and an air outlet, wherein the air inlet is connected to the manual drive gas branch, and the air outlet is connected to the exhaust branch; A pressure regulating assembly, which can be movably mounted on the valve seat assembly, and comprises a slide cylinder and a knob, wherein the slide cylinder is arranged inside the valve seat assembly and is spirally connected to the valve seat assembly, and the knob is connected to the slide cylinder or the valve seat assembly, and when the knob rotates, the slide cylinder or the valve seat assembly is driven to rotate, so that the slide cylinder moves to adjust the compression degree of the elastic member; A valve plate assembly, which is slidably connected to the slide cylinder and encloses the slide cylinder to form an air cavity, and the valve plate assembly is used to control the on-off between the air inlet and the air outlet; An elastic member, disposed in the air cavity, the elastic member comprising a first end and a second end, the first end abutting against the pressure regulating assembly, and the second end abutting against the valve plate assembly; The APL valve is further provided with a damping hole connecting the air cavity and the outside, and the damping hole is used for the discharge and suction of the gas inside the air cavity to suppress the resonance of the valve plate assembly.

2. The anesthesia machine according to claim 1, characterized in that: The slide cylinder and the knob are fastened together by a fastener; or, The knob is provided with a through hole in the axial direction of the slide cylinder, and the slide cylinder is provided with an extension column extending in the axial direction, and the extension column can be movably inserted into the through hole; or, One of the knob and the slide cylinder is provided with a slide groove along the axial direction of the slide cylinder, and the other of the knob and the slide cylinder is provided with a slider, and the slider can be slidably embedded in the slide groove.

3. The anesthesia machine according to claim 1, characterized in that: The valve plate assembly comprises: A sliding member, slidably mounted inside the sliding cylinder and enclosed with the sliding cylinder to form the air cavity, the second end of the elastic member abutting against the sliding member; A valve plate, wherein the valve plate abuts against the sliding member or the valve plate and the sliding member are integrally formed.

4. The anesthesia machine according to claim 3, characterized in that: The slide cylinder is made of any one of metal, glass, ceramic, polytetrafluoroethylene, polyoxymethylene, polyetheretherketone and graphite, or the inner side wall of the slide cylinder is provided with one of metal layer, glass layer, ceramic layer, polytetrafluoroethylene layer, polyoxymethylene layer, polyetheretherketone layer and graphite layer; and / or, The sliding part is a piston core made of any one of metal, glass, ceramic, polytetrafluoroethylene, polyoxymethylene, polyetheretherketone and graphite, or the outer side wall of the sliding part is provided with one of metal layer, glass layer, ceramic layer, polytetrafluoroethylene layer, polyoxymethylene layer, polyetheretherketone layer and graphite layer.

5. The anesthesia machine according to claim 1, characterized in that: The valve seat assembly comprises: A cylinder seat, wherein the slide cylinder is arranged inside the cylinder seat and is connected to the cylinder seat in a spiral transmission manner; The adapter assembly is installed at the bottom of the cylinder seat. The adapter assembly is provided with the air inlet and the air outlet. The valve plate assembly covers the air inlet of the adapter assembly.

6. The anesthesia machine according to claim 5, characterized in that: It also includes an annular diaphragm, the outer side of which is connected to the cartridge seat, and the inner side of which is connected to the valve sheet assembly. The annular diaphragm is used to prevent the gas exhaled by the patient from entering the interior of the cartridge seat.

7. The anesthesia machine according to claim 1, characterized in that: It also includes a leakage self-detection component, which is slidably mounted on the knob. When the leakage self-detection component is pressed by an external force, it moves toward the elastic member and resets when the external force is released.

8. The anesthesia machine according to claim 7, characterized in that: The leakage self-detection component comprises: A quick lock button, which can be reset and installed on the knob; A quick-lock shaft is connected to the quick-lock button. The quick-lock shaft can be movably inserted into the interior of the slide tube. The quick-lock shaft is used to squeeze the elastic member when the quick-lock button is pressed by an external force.

9. The anesthesia machine according to claim 7, characterized in that: The damping hole is provided on the slide cylinder, the valve plate assembly or the leakage self-detection assembly.

10. An APL valve, characterized in that: include: A valve seat assembly, provided with an air inlet and an air outlet, wherein the air inlet is used to be connected to a manual drive gas branch of the anesthesia machine, and the air outlet is used to be connected to a discharge branch of the anesthesia machine; A pressure regulating assembly, which can be movably mounted on the valve seat assembly, and comprises a slide cylinder and a knob, wherein the slide cylinder is arranged inside the valve seat assembly and is spirally connected to the valve seat assembly, and the knob is connected to the slide cylinder or the valve seat assembly, and when the knob rotates, the slide cylinder or the valve seat assembly is driven to rotate, so that the slide cylinder moves to adjust the compression degree of the elastic member; A valve plate assembly, which is slidably connected to the slide cylinder and encloses the slide cylinder to form an air cavity, and the valve plate assembly is used to control the on-off between the air inlet and the air outlet; An elastic member, disposed in the air cavity, the elastic member comprising a first end and a second end, the first end abutting against the pressure regulating assembly, and the second end abutting against the valve plate assembly; The APL valve is further provided with a damping hole connecting the air cavity and the outside, and the damping hole is used for the discharge and suction of the gas inside the air cavity to suppress the resonance of the valve plate assembly.

11. The APL valve according to claim 10, characterized in that It also includes a leakage self-detection component, which is slidably mounted on the pressure regulating component. When the leakage self-detection component is pressed by an external force, it moves toward the elastic member and resets when the external force is released.

12. The APL valve according to claim 10, characterized in that It also includes an annular diaphragm, the outer side of the annular diaphragm is connected to the valve seat assembly, and the inner side of the annular diaphragm is connected to the valve plate assembly. The annular diaphragm is used to block the gas exhaled by the patient from entering the area enclosed by the valve seat assembly and the annular diaphragm.

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