Split type breathing loop structure for anaesthesia machine and anaesthesia machine

Abstract

The invention relates to a split type breathing circuit structure for an anesthesia machine and the anesthesia machine with the split type breathing circuit structure. The split breathing circuit structure may include a circuit body including a circuit housing and a plurality of modules disposed inside the circuit housing, each module providing a portion of the breathing circuit; wherein the plurality of modules can be separated from one another; any two modules which are connected with each other and are in fluid communication are connected in a port sealing butt joint mode, and no fastener is used. According to the split type breathing circuit structure, the structural design of each module has a larger degree of freedom, an air channel can be formed in an optimized mode, and the air conveying performance of the breathing circuit structure is improved. In addition, the split type breathing circuit structure further has the advantages of being convenient to assemble, capable of achieving a larger integration level, easy to detect and judge the leakage position, better in disinfection effect and the like.

Description

Technical Field

[0001] This application relates to the field of medical devices, and more particularly to a split breathing circuit structure for an anesthesia machine and an anesthesia machine having the split breathing circuit structure. Background Art

[0002] An anesthesia machine is a specially designed medical device for providing precise doses of anesthesia to patients during surgery and other medical procedures.

[0003] The breathing circuit of an anesthesia machine refers to a part of the anesthesia machine. On the one hand, the breathing circuit is connected to the patient, and the gas exhaled by the patient enters the circuit and obtains the required gas such as anesthesia gas when inhaling. On the other hand, the breathing circuit is connected to the gas delivery system of the anesthesia machine, receives fresh gas, driving gas, etc. from the gas delivery system, and discharges the waste gas from the circuit. To achieve such functions, the breathing circuit usually includes the following functional components: an expiratory one-way valve and an inspiratory one-way valve on the patient side, an intake valve on the driving gas intake side, an expiratory valve on the driving gas exhaust side, an absorption canister for absorbing carbon dioxide in the gas, a coil or bellows for isolating the anesthesia gas from the driving gas, a manual-machine control valve for switching the breathing circuit between the manual and machine control states, and so on. To monitor the gas in the breathing circuit, the breathing circuit usually also includes functional components such as a flow probe and an oxygen concentration sensor.

[0004] In the prior art, the gas path part in the breathing circuit is usually formed as an integrally molded integrated block. Such an integrated block forms air passages therein between various functional components or leading to the outside, and also forms valve seats for installing valve cores. The integrated block can be formed of metal or plastic. For a metal integrated block, air passages are usually formed therein by drilling on a whole piece of metal. For a plastic integrated block, it usually includes two plastic parts, an upper shell and a lower shell, each of which is injection molded through a mold, and the two plastic parts are spliced facing each other to define the required air passages in the formed integrated block.

[0005] The inventors of this application have found that for the aforementioned integrated block type gas path structure, on the one hand, the formed air passages are restricted by the processing technology and have problems such as right-angle bends, complex air passages, excessive air resistance, complex sealing structures and poor sealing effects; on the other hand, since various functional components are integrated together, once a sealing leakage problem occurs, it is not easy to detect and determine the specific leakage location, and there is also a problem of poor disinfection effect when disinfecting the integrated block as a whole; thirdly, restricted by the one-piece molding process, some functional components in the breathing circuit cannot be implemented in the integrated block and need to be additionally connected outside the integrated block, which makes the integrity of the breathing circuit not satisfactory.

[0006] The inventors of the present application have also found that for the existing breathing circuit structure, there are still problems of cumbersome steps when calibrating the flow probe therein. Summary of the Invention

[0007] The purpose of the present application is to at least partially solve or alleviate the technical problems existing in the prior art described above.

[0008] To this end, according to one aspect of the present application, a split breathing circuit structure for an anesthesia machine is provided, including a circuit main body, the circuit main body includes a circuit housing and a plurality of modules arranged inside the circuit housing, and each module provides a part of the breathing circuit; wherein, the plurality of modules are separable from each other; any two modules that are connected to each other and in fluid communication are connected in a manner of port-sealed docking without using any fasteners.

[0009] Optionally, the plurality of modules are arranged in an extended plane defined by a first direction and a second direction perpendicular to the first direction, and the direction perpendicular to the extended plane is the third direction. Optionally, the direction of the port-sealed docking is substantially parallel to the extended plane. Optionally, the direction of the port-sealed docking is substantially along one of the first direction and the second direction.

[0010] Optionally, the plurality of modules at least include: a first module in which at least an expiratory valve is formed; a second module in which at least a valve seat of an inhalation one-way valve is formed; a third module in which at least a valve seat of an expiratory one-way valve is formed; a fourth module in which at least a manual / mechanical control valve is formed; and a fifth module in which at least a valve seat of an APL valve and a manual ventilation bag interface are formed.

[0011] Optionally, one or more or even all of the first module to the fifth module are integral modules.

[0012] Optionally, the expiratory valve in the first module extends integrally in the third direction; in the first module, there are further formed: a driving gas inlet pipe extending from the expiratory valve to the circuit housing along the first direction for receiving driving gas from the outside; a control gas inlet pipe extending from the expiratory valve to the circuit housing along the first direction for receiving control gas from the outside to control the state switching of the expiratory valve; a driving gas vent pipe extending from the expiratory valve to the circuit housing along the second direction for circulating the driving gas between the external coil assembly and the expiratory valve; and a waste discharge pipe extending from the expiratory valve to the circuit housing along the second direction for conveying waste gas from the expiratory valve to the waste discharge passage. The expiratory valve is disposed on the gas flow path between the driving gas inlet pipe and the waste discharge pipe; in one working mode, the control gas from the control gas inlet pipe causes the expiratory valve to close, so as to disconnect the gas flow path between the driving gas inlet pipe and the waste discharge pipe, and the driving gas from the driving gas inlet pipe enters the first module and then is discharged from the first module via the driving gas vent pipe and enters the coil assembly; in another working mode, the control gas leading to the control gas inlet pipe and the driving gas leading to the driving gas inlet pipe are both disconnected, and the expiratory valve is reset to open the gas flow path between the driving gas inlet pipe and the waste discharge pipe, and the gas from the coil assembly enters the first module from the driving gas vent pipe and then flows out from the waste discharge pipe.

[0013] Optionally, an inhalation chamber for receiving a sensor is further formed in the second module, and the inhalation chamber is in fluid communication with the outlet passage of the inhalation one-way valve. Optionally, the valve seat of the inhalation one-way valve in the second module extends integrally in the third direction; the inhalation chamber is located at the lateral peripheral wall of the valve seat of the inhalation one-way valve and has a sensor interface for receiving the sensor facing the circuit housing along the second direction; and a first tank connection port is formed at the bottom end of the valve seat of the inhalation one-way valve, wherein the first tank connection port opens downward along the third direction for forming a port-sealed docking with the first opening of the carbon dioxide absorption tank. Optionally, a fresh gas pipeline is further formed in the second module for conveying fresh gas containing anesthetic to the inhalation one-way valve; the fresh gas pipeline extends from the valve seat of the inhalation one-way valve to the circuit housing along the first direction.

[0014] Optionally, in the fourth module, the manual control valve extends substantially along the first direction between the circuit housing and the fifth module and has: a manual ventilation port formed at the end of the manual control valve facing the fifth module, capable of forming a port seal docking with a corresponding opening of the fifth module; a control gas inlet formed at the end of the manual control valve facing away from the fifth module for receiving control gas capable of switching the operating state of the manual control valve; a mechanically controlled ventilation channel extending from the manual control valve along the second direction for forming fluid communication with the coil assembly; an exhalation inlet pipe extending from the manual control valve along the second direction for forming a port seal docking with the third module; and an inhalation outlet interface formed at the bottom of the manual control valve and opening downward along the third direction for forming a port seal docking with a second opening of the carbon dioxide absorption tank.

[0015] Optionally, a connecting pipe is also formed in the third module, which can be connected between the fourth module and the coil assembly to achieve fluid circulation therebetween; within the third module, there is no direct gas flow between the connecting pipe and the exhalation check valve, and the connecting pipe is integrally formed with or fixedly connected to the valve seat of the exhalation check valve. Optionally, the valve seat of the exhalation check valve in the third module extends integrally along the third direction, and the valve seat of the exhalation check valve forms an exhalation inlet opening along the first direction and an exhalation outlet pipe extending along the second direction and facing the fourth module on its lateral peripheral wall; on the other side of the valve seat of the exhalation check valve opposite to the exhalation inlet, the connecting pipe extends along the second direction.

[0016] Optionally, a waste discharge pipe is also formed in the fifth module, and the waste discharge pipe extends from the valve seat of the APL valve to the circuit housing for transporting the waste gas discharged from the APL valve to the waste discharge channel; the waste discharge pipe is integrally formed with or fixedly connected to the valve seat of the APL valve. Optionally, the valve seat of the APL valve extends integrally along the third direction, and an opening for forming a port seal docking with the fourth module is formed on the lateral peripheral wall of the valve seat of the APL valve; the manual bellows interface faces the circuit housing along the first direction.

[0017] Optionally, the circuit body further includes a sixth module and a seventh module located within the circuit housing. The sixth module includes: a component capable of being connected to the exhalation probe base of the third module in a port-sealed docking manner; and an exhalation flow probe capable of being detachably inserted into the exhalation probe base along the first direction. The seventh module includes: a component capable of being connected to the inhalation probe base of the second module in a port-sealed docking manner; and an inhalation flow probe capable of being detachably inserted into the inhalation probe base along the first direction. Optionally, a water collection cup connector extending downward along the third direction is formed at the exhalation probe base for connecting a water collection cup installed from outside the circuit housing.

[0018] Optionally, the circuit body further includes a plurality of sampling tubes; the exhalation probe base and the inhalation probe base each have a pipe connector extending upward along the third direction; the fourth module has a sampling tube interface leading to the outside of the circuit housing; and the plurality of sampling tubes extend between the pipe connector and the sampling tube interface.

[0019] Optionally, the split-type breathing circuit structure includes a circuit connection block located between the coil assembly and the circuit body for transmitting gas between the coil assembly and the circuit body; wherein, the circuit connection block further defines an exhaust gas passage therein for receiving exhaust gas from the circuit body and discharging it to the outside through the exhaust gas passage.

[0020] Optionally, the seal for the port-sealed docking is a radial sealing method, in which the seal is located between two surfaces of two modules facing each other in a direction substantially perpendicular to the docking direction of the port-sealed docking.

[0021] According to another aspect of the present application, an anesthesia machine is provided, including the aforementioned split-type breathing circuit structure. Description of the Drawings

[0022] Figure 1 is a schematic diagram of a breathing circuit for an anesthesia machine according to the present application;

[0023] Figure 2 is an embodiment of the breathing circuit structure for an anesthesia machine according to the present application;

[0024] Figure 3 is Figure 2 an exploded assembly view of the shown breathing circuit structure;

[0025] Figure 4 is Figure 3 an exploded assembly view of the circuit components in the shown breathing circuit structure;

[0026] Figure 5 is Figure 4 an exploded assembly view of Assembly B in the circuit component shown;

[0027] Figure 6 is Figure 5 a cross-sectional view of the inhalation phase component in;

[0028] Figure 7 is Figure 5 an exploded assembly view of the inhalation phase component in;

[0029] Figure 8 is Figure 5 a partial cross-sectional view of the inhalation chamber of the inhalation phase component and the sensor mounting structure it has;

[0030] Figure 9 is a partial cross-sectional view after installing the aerobic concentration sensor on the basis of Figure 8 ;

[0031] Figure 10 is Figure 5 a cross-sectional view of the manual pneumatic control valve component in, shown in the pneumatic control state; and

[0032] Figure 11 is Figure 4 a cross-sectional view of the expiratory valve component in. Detailed implementation manners

[0033] The technical solutions of the present application will be described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0034] As Figure 1 shown, the breathing circuit may include a manual pneumatic control valve 35, which can be switched between the manual state and the pneumatic control state, so that the entire breathing circuit can be switched between the manual working mode and the pneumatic control working mode. The driving gas entering the breathing circuit can generally be divided into three paths. The first path of driving gas 61 leads to the manual pneumatic control valve 35 for controlling the switching of the manual pneumatic control valve 35 between the manual state and the pneumatic control state. The second path of driving gas 62 can lead to the expiratory valve 32 to control the opening and closing of the expiratory valve 32. The third path of driving gas 63 can lead to the coiled tube 34 to push the existing gas in the coiled tube 34. By controlling the working of the driving gas and other related components and gas paths, the expiratory circuit can realize the inhalation cycle and exhalation cycle of the patient 42 in the manual working mode and the pneumatic control working mode respectively. At the same time, during the inhalation cycle of the patient 42, the inhaled gas contains anesthetic drugs applied under control (such a gas containing anesthetic drugs can be called anesthetic gas) to achieve the desired anesthetic effect.

[0035] Figure 1The manually controlled valve 35 shown in the figure is currently in the machine-controlled state. Therefore, the breathing circuit is correspondingly in the machine-controlled working mode. During the exhalation cycle of the patient 42, the exhalation valve 32 is in the open state. In this way, the gas exhaled by the patient 42 (usually containing anesthetic) sequentially passes through the exhalation flow probe 40, the exhalation check valve 39, and the manually controlled valve 35 and then enters the coiled tube 34. Among them, the flow path of the exhalation of the patient 42 between the patient 42 and the manually controlled valve 35 can be called the exhalation flow path. The exhalation flow probe 40 and the exhalation check valve 39 are located on this exhalation flow path, and the exhalation check valve 39 is located downstream of the exhalation flow probe 40. The exhaled gas entering the coiled tube 34 can push the driving gas entering the coiled tube 34 in the previous inhalation cycle out of the breathing circuit through the exhalation valve 32 and enter the anesthetic gas scavenging system (AGSS) for subsequent processing. During the exhalation cycle, according to the previous arrangement or current needs, a certain amount of fresh gas (the anesthetic gas newly entering the breathing circuit) may enter the breathing circuit from the fresh gas branch 98 and enter the carbon dioxide absorber 37 for use in the subsequent inhalation cycle. At the same time, during the exhalation cycle, most of the anesthetic-laden gas exhaled by the patient 42 will enter the coiled tube 34 and can be temporarily stored therein and reused for the patient 42 to re-inhale in the subsequent inhalation cycle. Hereinafter, this recycled anesthetic gas in the breathing circuit is also referred to as the recycled gas to distinguish it from the anesthetic gas newly entering the breathing circuit (i.e., the fresh gas).

[0036] During the inhalation cycle of the patient 42 in the machine-controlled working mode, the exhalation valve 32 is in the closed state. The third driving gas 63 enters the coiled tube 34, pushes the recycled gas stored in the coiled tube 34 out of the coiled tube 34, and enters the carbon dioxide absorber 37 through the manually controlled valve 35. Inside the carbon dioxide absorber 37, the recycled gas is mixed with the fresh gas that entered here during the exhalation cycle (if there was fresh gas entering the absorber 37 before), and is processed by the carbon dioxide absorbent in the absorber 37 to reduce the carbon dioxide content in the anesthetic gas. After the processed anesthetic gas leaves the absorber 37, it enters the patient 42's body (such as the lungs) through the inhalation check valve 38 and the inhalation flow probe 41. Among them, the flow path of the inhalation of the patient 42 between the manually controlled valve 35 and the patient 42 can be called the inhalation flow path. The carbon dioxide absorber 37, the inhalation check valve 38, and the inhalation flow probe 41 are arranged in sequence along the gas flow direction on this inhalation flow path. During this inhalation cycle, according to the previous arrangement or current needs, fresh gas may enter the breathing circuit simultaneously and enter the patient 42's body together with the anesthetic gas leaving the absorber 37. As Figure 1 shown, the fresh gas branch 98 enters this inhalation flow path between the carbon dioxide absorber 37 and the inhalation check valve 38 and is upstream of the inhalation check valve 38 on the inhalation flow path.

[0037] Next, continue to describe the manual operation mode of the breathing circuit in combination with Figure 1 wherein, first, the suction valve 28 and the solenoid valve 27 need to be powered off to cut off the supply of the driving gas, thereby also cutting off the supply of the first to third paths of driving gas 61 - 63. This causes the manual pneumatic control valve 35 to switch from the current pneumatic control state to the manual state and the exhalation valve 32 to be in the open state. During the inhalation cycle in the manual operation state, the operator manually presses the manual bellows 45, causing the gas in the manual bellows 45 to leave the manual bellows 45, and then enter the carbon dioxide absorber 37 through the manual pneumatic control valve 35. The gas in the absorber 37 is processed by the carbon dioxide absorbent therein and then leaves the absorber 37, and then enters the patient 42's body sequentially through the inhalation check valve 38 and the inhalation flow probe 41 together with the fresh gas mixed with anesthetic. The APL valve (adjustable pressure limiting valve) 33 is used to control the maximum air pressure of the gas input to the manual bellows 45, that is, when the gas pressure generated by pressing the manual bellows 45 exceeds the preset pressure threshold of the APL valve 33, part of the gas will be discharged into the AGSS through the APL valve 33 to avoid generating an undesired overpressure in the breathing circuit.

[0038] During the exhalation cycle in the manual operation state, the states of the aforementioned suction valve 28, solenoid valve 27, manual pneumatic control valve 35, and exhalation valve 32 remain the same as those in the inhalation cycle described above, and the operator manually releases the manual bellows 45. The gas exhaled by the patient 42 (usually containing anesthetic) sequentially passes through the exhalation flow probe 40, the exhalation check valve 39, and the manual pneumatic control valve 35 and then enters the manual bellows 45, causing the manual bellows 45 to bulge. During this exhalation cycle, fresh gas can also enter the absorber 37 so as to flow to the patient 42 together with the gas from the manual bellows 45 during the subsequent inhalation cycle.

[0039] It should be noted that in Figure 1 the breathing circuit shown, a branch 99 can be led out on the expiratory gas flow path between the exhalation flow probe 40 and the exhalation check valve 39, and a detachable water trap 65 can be provided at the end of this branch 99. This branch can be called the water trap branch. The liquid water formed by the condensation of the water vapor contained in the exhaled gas of the patient 42 can be collected into the water trap 65 through the water trap branch 99. When the water trap 65 is connected to the water trap branch 99, the water trap 65 can seal the water trap branch 99; when the water trap 65 is in a separated state from the water trap branch 99, for example, when the water trap 65 is detached from the water trap branch 99, the water trap branch 99 leads to the atmosphere, or is in communication with the ambient air.

[0040] Figure 1Also shown are an air intake valve 28, an IP valve 30, a solenoid valve 27, an air block 29, a safety valve 31 and a filter 6. These components are mainly used for on-off control, pressure control and filtering of the driving gas. The functions and applications of these functional components are well known to those skilled in the art and will not be described in detail here.

[0041] Figure 2 The breathing circuit structure shown can be used to achieve Figure 1 The portion of the breathing circuit enclosed by the dotted frame A is shown. Figure 2 As shown in FIG. 1 , the breathing circuit structure can generally include a circuit assembly 1000, a coil assembly 2000, a gas control connection plate assembly 3000 and a carbon dioxide absorption tank 4000. The coil assembly 2000 can basically correspond to Figure 1 The coil 34 in the carbon dioxide absorption tank 4000 can basically correspond to the Figure 1 The absorption tank 37 in the circuit assembly 1000 may correspond to Figure 1 The circuit assembly 1000 includes the parts except the coil 34 and the absorber 37 in the dotted line frame A. The circuit assembly 1000 may include an exhalation connector 1001 and an inhalation connector 1002, which are used to install an exhalation tube and an inhalation tube (not shown) leading to the patient, respectively, so as to Figure 1 As shown in the figure, the patient 42 is provided with the required inhaled gas and the gas exhaled by the patient 42 is received. The exhalation connector 1001 and the inhalation connector 1002 can be formed into a curved shape and have a section extending downward or obliquely downward after being installed in place. Such connectors are more convenient for operators to manually install the breathing tube and the inhalation tube. In particular, for the exhalation connector 1001, compared with a connector extending in a straight line, when the water vapor in the patient's exhaled air condenses into water here, such an exhalation connector 1001 can prevent the condensed water from flowing back to the circuit assembly 1000. The circuit assembly 1000 may also include a manual leather bag connector 1003 for connecting as Figure 1 The manual leather bag 45 shown. The carbon dioxide absorption tank 4000 can be a soda lime tank, or can be an adsorption device containing other types of carbon dioxide adsorbents. The gas control connecting plate assembly 3000 can be used as Figure 1 The fresh gas to be introduced into the breathing circuit is connected to the interface between the first to third driving gases 61-63 and the circuit assembly 1000.

[0042] like Figure 3-4 As shown in the exploded view of FIG. 1 , the circuit assembly 1000 may include a circuit body 1000a and a circuit connection block 1000b detachably connected to the circuit body 1000a. The circuit connection block 1000b may include a connection block body 1016 and a cover plate 1015 detachably connected to the connection block body 1016, wherein the cover plate 1015 is Figure 4 It can be seen inFigure 3 is not visible in order to more clearly see the internal structure of the circuit connection block 1000b. The circuit connection block 1000b can be used as an interface for the gas flow between the coil assembly 2000 and the circuit assembly 1000, or rather the circuit main body 1000a. To this end, the circuit connection block 1000b can include pipes 1011 and 1012, and the ends thereof facing the coil assembly 2000 (the ends are Figure 3 not visible due to occlusion in Figure 4 and are visible in

[0043] can be hermetically docked with the gas ports 2001 and 2002 of the coil assembly 2000 respectively in the assembled state, and the ends thereof facing the circuit main body 1000a can form port hermetic docking with the corresponding gas ports of the circuit main body 1000a respectively in the assembled state. The term "port hermetic docking" used here and elsewhere in this application refers to such a connection method: a connection between an opening, hole, pipe or channel and another opening, hole, pipe or channel by means of one inserting into the other or directly abutting against each other and optionally sealed by a sealing member such as a sealing ring while maintaining fluid communication between the two. Figure 1 as shown in Figure 4 . The cover plate 1015 can be hermetically connected to the connection block main body 1016 and can, together with the connection block main body 1016 in the assembled state, define the waste discharge channel 1013 as Figure 3 shown.

[0044] The coil assembly 2000 can include an upper housing 2003 and a lower housing 2004 that are detachably connected to each other and define a bent and extending air flow channel (not shown) therebetween, and the two ends of the air flow channel terminate at the gas ports 2001 and 2002 respectively. As previously combined with Figure 1Like the described coiled pipe 34, the coiled pipe assembly 2000 can receive and discharge the driving gas (such as the third driving gas 63), and at the same time can accommodate the reusable anesthetic gas (i.e., the recycled gas). The driving gas and the recycled gas can enter and leave the coiled pipe assembly 2000 through the gas ports 2001 and 2002 of the coiled pipe assembly 2000, and enter and leave the loop body 1000a through the pipes 1011 and 1012 of the loop connection block 1000b of the loop assembly 1000, so as to allow the required flow of the third driving gas 63 and the recycled gas during the exhalation cycle and the inhalation cycle of the patient 42 in the machine-controlled working mode described above. In addition, the coiled pipe assembly 2000 can have a connecting portion 2005 extending outward from its lower housing 2004. In the assembled state, the connecting portion 2005 can extend to the lower side of the loop connection block 1000b, and the connecting portion 2005 can be detachably connected to the loop connection block 1000b by using fasteners (such as a handwheel, not shown).

[0045] The gas control connecting plate assembly 3000 can include positioning guide shafts 3001 and 3002 and hooks 3003 and 3004, so as to be able to detachably connect the gas control connecting plate assembly 3000 to the loop assembly 1000. During assembly, the positioning guide shafts 3001 and 3002 of the gas control connecting plate assembly 3000 can be respectively aligned with the corresponding receiving holes (not shown) of the loop assembly 1000 and inserted until the hooks 3003 and 3004 are respectively snapped into the corresponding hooks (not shown) of the loop assembly 1000. The positions of the positioning guide shafts 3001 and 3002 and the corresponding receiving holes of the loop assembly 1000 are preset, so that after assembly, each interface at the gas control connecting plate assembly 3000 can be accurately aligned with the corresponding interface at the loop assembly 1000. It should be noted that the positioning guide shaft 3001 and the hook 3003 can be inserted into the loop connection block 1000b of the loop assembly 1000, and the positioning guide shaft 3002 and the hook 3004 can be inserted into the loop body 1000a of the loop assembly 1000. This arrangement helps to further strengthen the structural stability between the loop connection block 1000b and the loop body 1000a of the loop assembly 1000 in the assembled state.

[0046] In addition, to facilitate the separation of the air control connection plate assembly 3000 from the circuit assembly 1000 in the assembled state, an unlocking button 1004 can be provided at the circuit body 1000a of the circuit assembly 1000, and a transmission member 3005 can be provided at the air control connection plate assembly 3000. The transmission member 3005 can be operably connected to the unlocking button 1004, and at the same time, the transmission member 3005 can also be operably connected to the hooks 3003 and 3004 via a suitable transmission mechanism (not shown). In this way, when unlocking, the unlocking button 1004 can be pressed, and the unlocking button 1004 then presses down the transmission member 3005. The transmission member 3005 then drives the hooks 3003 and 3004 to move in the unlocking direction until the unlocking state is reached. Finally, the air control connection plate assembly 3000 can be pulled outwards to separate it from the circuit assembly 1000.

[0047] The circuit body 1000a can be integrally formed into a flat block substantially in the shape of a cuboid, which can include a circuit housing 1100 and functional components mounted on and accommodated in the circuit housing 1100. Different from the integrated block implementation method in the prior art, the functional components accommodated in the circuit housing 1100 adopt a split design concept, which is more clearly seen in Figure 4 and Figure 5 For the convenience of description, the first direction (X-axis direction), the second direction (Y-axis direction) perpendicular to the first direction, and the third direction (Z-axis direction) perpendicular to the plane (horizontal plane) where the first direction and the second direction are located are marked in Figure 4 and Figure 5 An exploded view of the circuit assembly 1000 is shown, where the remaining part except the circuit connection block 1000b and the absorption tank 4000 belongs to the

[0048] Figure 4 circuit body 1000a shown in Figure 3 As shown in Figure 4 shown, Figure 3 the circuit housing 1100 identified in Figure 5They are further separated from each other in [reference document] to clearly show the structure of each functional component and their mutual connection and layout relationship under the split design concept. The reason for dividing the functional components inside the circuit body 1000a into the exhalation valve assembly 1200 and the assembly B is that: inside the circuit housing 1100, there may be no gas path connection between the exhalation valve assembly 1200 and the assembly B, while there is a gas path connection between most of the functional components (except the heating functional component) included in the assembly B. The exhalation valve assembly 1200 can basically correspond functionally to Figure 1 the exhalation valve 32 shown in [reference document].

[0049] Refer to Figure 5 , the assembly B may include an exhalation phase assembly 1300, an inhalation phase assembly 1400, an inhalation probe base assembly 1500a, an inhalation flow probe assembly 1500b, an exhalation probe base assembly 1600a, an exhalation flow probe assembly 1600b, a manual resuscitator bag assembly 1700, and a manual mechanical control valve assembly 1800. These listed components are separated from each other and can be detachably assembled together.

[0050] As Figure 5 shown, the inhalation flow probe assembly 1500b can be detachably inserted into the inhalation probe base assembly 1500a. The inhalation flow probe assembly 1500b can basically correspond functionally to Figure 1 the inhalation flow probe 41 shown in [reference document], which is used to detect the inhalation flow of the patient. The inhalation flow probe assembly 1500b can be generally in the shape of a long cylinder with both ends open, so as to define an air flow channel 1503 therein. Among them, the inhalation flow probe assembly 1500b and its air flow channel 1503 can basically extend along the X-axis direction. The inhalation flow probe assembly 1500b has a first through hole 1504 and a second through hole 1505 on its cylinder wall. The first and second through holes 1504 and 1505 can basically extend along the Z-axis direction and communicate with the air flow channel 1503, and are arranged on a straight line along the X-axis direction. The inhalation flow probe assembly 1500b is provided with a first sealing ring 1506 and a second sealing ring 1507 on the outer side of its cylinder wall, which are respectively arranged on both sides of the first through hole 1504, and the second sealing ring 1507 is located between the first through hole 1504 and the second through hole 1505. A diaphragm (not shown) is provided in the air flow channel 1503, and the diaphragm is located between the first through hole 1504 and the second through hole 1505.

[0051] The inhalation probe base assembly 1500a can be integrally formed into a cuboid-shaped block, and a channel 1508 extending in the X-axis direction can be formed therein. On the one hand, this channel 1508 defines the airflow channel within the breathing circuit, and on the other hand, it is used to receive the inhalation flow probe assembly 1500b to be inserted. The inhalation probe base assembly 1500a may also have a first pipe joint 1509 and a second pipe joint 1510 extending in the Z-axis direction on its outer side, and they are located on a straight line along the X-axis direction.

[0052] In the assembled state of the inhalation flow probe assembly 1500b and the inhalation probe base assembly 1500a, the inhalation flow probe assembly 1500b is inserted into the inhalation probe base assembly 1500a. In this assembled state, the first through hole 1504 and the second through hole 1505 of the inhalation flow probe assembly 1500b are respectively aligned with the first pipe joint 1509 and the second pipe joint 1510 of the inhalation probe base assembly 1500a and form a fluid connection. To facilitate this alignment, the inhalation flow probe assembly 1500b has an alignment mark 1511 at its outer end portion. This alignment mark 1511 can be in the form of a protrusion and is located on the straight line where or defined by the first and second through holes 1504 and 1505. Correspondingly, referring to Figure 4 , there is a notch on the top along the Z-axis direction of the inhalation interface hole 1105 of the circuit lower housing 1101 that cooperates with this alignment mark 1511. In this way, after the inhalation probe base assembly 1500a is installed in place at the circuit lower housing 1101, when the inhalation flow probe assembly 1500b is passed through this inhalation interface hole 1105 and then inserted into the channel 1508 of the inhalation probe base assembly 1500a, as long as the alignment mark 1511 is aligned with the notch of the inhalation interface hole 1105 and enters this notch, the alignment between the through holes 1504 and 1505 and the pipe joints 1509 and 1510 can be achieved in the rotational direction around the X-axis. To achieve the alignment in the straight line direction along the X-axis, the dimensions of the pre-designed components can be used such that when the inhalation flow probe assembly 1500b is inserted until it can no longer be further inserted, it is in the alignment position in the straight line direction along the X-axis.

[0053] The exhalation flow probe assembly 1600b can be detachably inserted into the exhalation probe base assembly 1600a. Functionally, the exhalation flow probe assembly 1600b can basically correspond to Figure 1The expiratory flow probe 40 shown in the figure is used to detect the expiratory flow of the patient. The expiratory flow probe assembly 1600b may have substantially the same structure as the inspiratory flow probe assembly 1500b, and the difference may be that: when these two flow probe assemblies are working, the direction of the airflow flowing through the probe is different, so the bending direction of the elastic diaphragm inside is different. Therefore, in order to distinguish these two flow probe assemblies and avoid confusion, the external dimensions of the alignment marks (not shown) of the expiratory flow probe assembly 1600b can be different from those of the alignment marks 1511 of the inspiratory flow probe assembly 1500b, so that they can be distinguished from the outside of the assembly without disassembling the assembly or trying to observe the diaphragm inside the assembly.

[0054] The expiratory probe base assembly 1600a may have substantially the same structure as the inspiratory probe base assembly 1500a. Among them, the expiratory probe base assembly 1600a may include a channel 1608 that is substantially the same as the channel 1508, and pipe connectors 1609 and 1610 that are substantially the same as the pipe connectors 1509 and 1510. Moreover, the relative arrangement positions between the expiratory flow probe assembly 1600b and the expiratory probe base assembly 1600a are also substantially the same as those between the inspiratory flow probe assembly 1500b and the inspiratory probe base assembly 1500a. The difference between the expiratory probe base assembly 1600a and the inspiratory probe base assembly 1500a is that the expiratory probe base assembly 1600a has a condensate cup connector 1612 for connecting Figure 4 the condensate cup 1005 shown in the figure. The condensate cup 1005 can be functionally substantially corresponding to Figure 1 the condensate cup 65 shown in the figure, and the condensate cup connector 1612 can be functionally substantially corresponding to Figure 1 the condensate cup branch 99 shown in the figure. As Figure 4 shown, the condensate cup connector 1612 extends outward in the Z-axis direction at the lower part of the expiratory probe base assembly 1600a, and passes downward through the circuit lower housing 1101 and extends out of the circuit lower housing 1101 in the assembled state, so as to facilitate connecting the condensate cup 1005 to the condensate cup connector 1512 or detaching the condensate cup 1005 from the condensate cup connector 1512 outside the circuit housing 1100 ( Figure 3 ). The condensate cup connector 1612 can be communicated with the airflow channel defined inside the expiratory probe base assembly 1600a, so that the liquid water formed by the condensation of the water vapor contained in the patient's exhalation can be collected into the condensate cup 1005 via the condensate cup connector 1612.

[0055] See Figure 4 , in the assembled state, the inspiratory phase assembly 1400 forms a port seal docking with the inspiratory probe base assembly 1500a on the other side opposite to the inspiratory flow probe assembly 1500b. More specifically, see Figure 5, the passage 1508 of the inhalation probe base assembly 1500a can form a port seal docking with the opening 1403 of the inhalation phase assembly 1400 on the side opposite to the inhalation flow probe assembly 1500b. The inhalation phase assembly 1400 is mainly functionally used to implement Figure 1 the inhalation one-way valve 38 in Figure 1 , and is also used to receive

[0056] the fresh gas shown in Figure 4 , and to accommodate a sensor for measuring the oxygen concentration in the patient's inhalation. Figure 1 The inhalation phase assembly 1400 includes a substantially cylindrical inhalation one-way valve seat 1401 extending along the vertical (Z-axis direction).

[0057] In Figure 5 , it can be seen that the inhalation phase assembly 1400 further includes a fresh gas pipe 1404. The fresh gas containing anesthetic from the fresh gas source can enter the inhalation one-way valve via the fresh gas pipe 1404. The fresh gas pipe 1404 can extend from the inhalation one-way valve seat 1401 along the X-axis direction to the circuit baffle 1102 of the circuit housing, and then be connected to the fresh gas source (not shown) at the air control connection plate assembly 3000, which can be referred to Figure 3 and Figure 4 to know, although the fresh gas pipe 1404 is not visible due to being blocked or covered in Figure 3 and Figure 4 .

[0058] Figure 6 Shows Figure 5 a cross-sectional view of the inhalation phase assembly 1400 taken along the central axis C of the inhalation one-way valve and in the Y-Z plane, and additionally shows the assembled inhalation flap 1006 and inhalation flap cover 1007. As Figure 6As shown, the intake one-way valve seat 1401 has a first tank connection port 1406 at its bottom end and an intake air passage 1405 extending in the vertical direction (Z-axis direction). The first tank connection port 1406 is in fluid communication with the intake air passage 1405. The first tank connection port 1406 opens in the Z-axis direction to facilitate port-sealing docking with the first opening 4001 of the carbon dioxide absorption tank 4000 that opens upward in the Z-axis direction, so as to receive the processed gas from the carbon dioxide absorption tank 4000. The intake one-way valve seat 1401 has a sandwich structure in its upper part, so as to define an outlet air passage 1407 between the sandwich structures. The intake valve flap 1006 is located on the flow path between the intake air passage 1405 and the outlet air passage 1407, and is arranged to allow the patient's inhalation to flow from the intake air passage 1405 to the outlet air passage 1407, and not allow the gas to flow from the outlet air passage 1407 to the intake air passage 1405. Figure 6 The opening 1408 can also be seen in Figure 5 The fresh gas pipeline 1404 in is connected to the intake air passage 1405 of the intake one-way valve seat 1401 at the opening 1408. Figure 6 The blind hole 1409 and the openings 1410 and 1411 can also be seen in Figure 3 Among them, the blind hole 1409 can be used to receive

[0059] The intake chamber 1402 can be in fluid communication with the outlet air passage 1407 of the intake one-way valve seat 1401. In this way, the patient's inhalation will enter the intake chamber 1402 from the outlet air passage 1407. As Figure 7 shown, the intake chamber 1402 can have a sensor mounting structure for receiving an oxygen concentration sensor (such as an oxygen cell) to measure the oxygen concentration in the patient's inhalation.

[0060] See Figure 7-Figure 9 , the sensor mounting structure can include a mounting seat 1412 formed at the first side wall 1415 of the intake chamber 1402. The mounting seat 1412 can include, for example, a circular cylinder 1414, and the cylinder 1414 defines an elongated guide hole 1413 therein. The guide hole 1413 can be formed as a blind hole with a closed outer end. The extending direction of the guide hole 1413 is basically along Figure 5The Y-axis direction (i.e., the second direction) shown in the figure. The push rod 1416 is arranged inside the chamber 1402 and has a rod portion 1417 and a blocking portion 1418. The blocking portion 1418 can be formed at the right end of the rod portion 1417. The rod portion 1417 of the push rod 1416 can extend into the guide hole 1413. The guide hole 1413 can receive and guide the rod portion 1417 of the push rod 1413, so that the push rod 1416 can reciprocate along the extension direction of the guide hole 1413 (i.e., the second direction). The mounting seat 1412 can also include a groove 1428 extending circumferentially outside the cylinder 1414 for accommodating the end of the biasing spring 1414 facing the mounting seat 1412.

[0061] The mounting seat 1412 can be integrally formed with the first side wall 1415 of the suction chamber 1402 and can protrude from the first side wall 1415 toward the outside of the chamber to reduce the occupation of the internal volume of the chamber.

[0062] A sensor interface 1420 can be formed at the second side wall 1419 opposite to the first side wall 1415 in the second direction. The sensor interface 1420 can be cylindrical as a whole, and a mounting through hole 1421 is defined therein. The sensor interface 1420 can have a first end 1422 facing the first side wall 1415 and a second end 1423 opposite to the first end 1422. The mounting through hole 1421 can pass through the first end 1422 and the second end 1423 and receive the oxygen concentration sensor 1008 to be installed therein (see Figure 3 and Figure 8 ).

[0063] The biasing spring 1424 can apply a biasing force to the push rod 1416 toward the sensor interface 1420, so that the push rod 1416 moves toward the sensor interface 1420. As Figure 8 shown, in the case where the oxygen concentration sensor 1008 is not installed, the biasing spring 1424 pushes the push rod 1416 until the blocking portion 1418 of the push rod 1416 abuts against the first end 1422 of the sensor interface 1420 to close the mounting through hole 1421 of the sensor interface 1420 on one side.

[0064] The blocking portion 1418 of the push rod 1416 includes an enlarged portion 1425 with a larger lateral dimension relative to the rod portion 1417, and the size of the enlarged portion 1425 is suitable for the case where the oxygen concentration sensor is not installed ( Figure 8)Against the first end 1422 of the sensor interface 1420. The biasing spring 1424 can be a helical spring around the rod portion 1417 of the push rod 1416, and the helical spring is restricted in a compressed state between the mounting base 1412 and the enlarged portion of the plugging portion 1418. In this way, the enlarged portion 1425 of the push rod 1416 is used on the one hand to plug the mounting through hole 1421 of the sensor interface 1420, and on the other hand to limit the biasing spring 1424.

[0065] The plugging portion 1418 of the push rod 1416 can also include a seal ring bearing portion 1426 and a first seal ring 1427. The first seal ring 1427 can be arranged in a groove (not labeled) around the outer peripheral wall of the seal ring bearing portion 1426. As Figure 8 shown, the size of the seal ring bearing portion 1426 is suitable for extending into the mounting through hole 1421 of the sensor interface 1420, so that the first seal ring 1427 is between the inner peripheral wall of the mounting through hole 1421 and the outer peripheral wall of the seal ring bearing portion 1426 and plays a sealing role between the two.

[0066] See Figure 9 , the oxygen concentration sensor 1008 can be inserted into the sensor interface 1420 at the second end 1423 of the sensor interface 1420. The detection end 1008a of the oxygen concentration sensor 1008 passes through the mounting through hole 1421 of the sensor interface 1420 and extends out from the first end 1422 of the sensor interface 1420 to enter the chamber 1420 to detect the oxygen concentration in the gas therein. During the insertion of the oxygen concentration sensor 1008, its detection end 1008a will push the plugging portion 1418 of the push rod 1416 away from the first end 1422 of the sensor interface 1420. The oxygen concentration sensor 1008 can be provided with a second seal ring 1008b on its outer peripheral wall. When the oxygen concentration sensor 1008 is installed in place, the second seal ring 1008b is between the inner peripheral wall of the mounting through hole 1421 of the sensor interface 1420 and the outer peripheral wall of the oxygen concentration sensor 1008 and plays a sealing role between the two.

[0067] In addition, internal threads (obviously visible in the figure, not labeled) can be formed at the second end 1423 of the sensor interface 1420, and external threads matching the internal threads are formed on the outer peripheral wall of the oxygen concentration sensor 1008. In this way, the oxygen concentration sensor 1008 can be inserted into the sensor interface 1420 in a screwing manner, and a firm connection between the oxygen concentration sensor 1008 and the sensor interface 1420 can be achieved.

[0068] Return Figure 7, the second side wall 1419 of the intake chamber 1402 may be detachable. The sensor interface 1420 may be integrally formed with the second side wall 1419 and is sealingly connected to the intake chamber 1402 by means of fasteners 1429 and a sealing ring 1430.

[0069] Reference is made below Figure 4 、 Figure 5 and Figure 10 to illustrate the manual control valve assembly 1800, which is functionally substantially corresponding to Figure 1 the manual control valve 35 in. The manual control valve assembly 1800 may extend in the X-axis direction as a whole. One end thereof is located at the housing baffle 1102 of the circuit housing 1100, and the other opposite end may form a port-sealing butt joint with the manual bellows assembly. The manual control valve assembly 1800 may include a control gas inlet 1801 for receiving control gas, a manual ventilation port 1804 in fluid communication with the manual bellows, a mechanically controlled ventilation passage 1805 in fluid communication with the coil assembly 2000, an exhalation inlet pipe 1806 in fluid communication with the exhalation phase assembly 1300, and an intake outlet interface 1807 in fluid communication with the second opening 4002 of the carbon dioxide absorption tank 4000. The manual ventilation port 1804 may be formed at the end of the manual control valve assembly 1800 facing the manual bellows assembly 1700 and can form a port-sealing butt joint with the corresponding opening of the manual bellows assembly 1700. The control gas inlet 1801 is located at the end of the manual control valve assembly 1800 facing away from the manual bellows assembly 1700, and it may receive a driving gas (such as Figure 1 the first-way driving gas 61 in) as the control gas from a driving gas source so as to change the working state of the manual control valve under the pressure of the control gas and make it selectively in one of the mechanically controlled state and the manual state. The mechanically controlled ventilation passage 1805 and the exhalation inlet pipe 1806 may extend from the manual control valve assembly 1800 in the Y-axis direction, and the intake outlet interface 1807 is formed at the bottom of the manual control valve assembly 180 and opens downward in the Z-axis direction. Inside the manual control valve assembly 1800, the exhalation inlet pipe 1806 and the intake outlet interface 1807 are in communication with the mechanically controlled ventilation passage 1805 via an internal passage 1810.

[0070] The driving gas entering the manual control valve assembly 1800 through the control gas inlet 1801 will force the diaphragm 1802 to move to the left (away from the control gas inlet 1801 direction). The diaphragm 1802 then pushes the bracket 1808 with the sealing diaphragm 1803 to move to the left until the manual ventilation port 1804 of the manual control valve assembly 1800 is closed, that is, the sealing diaphragm 1803 is at Figure 10the position currently shown. At this time, the manual pneumatic valve assembly 1800 is in the pneumatic control state, and the biasing spring 1809 that was originally in the compressed state is further compressed. In this pneumatic control state, during the patient's exhalation cycle, the patient's exhaled breath enters the manual pneumatic valve assembly 1800 from the exhalation inlet pipe 1806, and then flows out through the pneumatic control ventilation passage 1805 and towards the coil assembly 2000; during the patient's inhalation cycle, the gas from the coil assembly 2000 enters the manual pneumatic valve assembly 1800 through the pneumatic control ventilation passage 1805, and then flows out through the inhalation outlet interface 1807 and towards the carbon dioxide absorption canister 4000.

[0071] When switching the manual pneumatic valve assembly 1800 from Figure 10 the pneumatic control state shown to the manual state, first cut off the driving gas from the gas control inlet 1801. In this way, the compressed biasing spring 1809 begins to recover. Under the biasing pressure of the biasing spring 1809, the bracket 1808 with the sealing diaphragm 1803 and the diaphragm 1802 move to the right together, causing the sealing diaphragm 1803 to open the manual ventilation port 1804 and continue to move to the right to close the internal passage 1810. At this time, the manual pneumatic valve assembly 1800 is in the manual state (not shown in the figure). In this manual state, during the patient's exhalation cycle, the patient's exhaled breath enters the manual pneumatic valve assembly 1800 from the exhalation inlet pipe 1806, and then flows out through the manual ventilation port 1804 and towards the manual bellows; during the patient's inhalation cycle, the gas from the manual bellows enters the manual pneumatic valve assembly 1800 through the manual ventilation port 1804, and then flows out through the inhalation outlet interface 1807 and towards the carbon dioxide absorption canister 4000.

[0072] The manual pneumatic valve assembly 1800 may further include a sampling tube interface 1811 at its top for connecting the sampling tube 1901 of the flow probe, as can be seen in Figure 5 . As Figure 5 shown, the manual pneumatic valve assembly 1800 may have four sampling tube interfaces 1811 respectively connected to one end of four sampling tubes 1901, and the other ends of these four sampling tubes 1901 are respectively connected to two pipe connectors 1509 and 1510 of the inhalation probe base assembly 1500a and two pipe connectors 1609 and 1610 of the exhalation probe base assembly 1600a.

[0073] See Figure 5 , the exhalation phase assembly 1300 may include an exhalation check valve seat 1301 that extends substantially cylindrically along the vertical (Z-axis direction). Figure 4The expiratory valve 1009 therein can be used as the valve core of the expiratory one-way valve and, during assembly, can pass through the opening of the upper cover 1103 of the loop and be placed at the top end of the expiratory one-way valve seat 1301. Then, the expiratory valve cover 1010 is screwed into the opening of the upper cover 1103 of the loop so that its lower end is in sealed butt-joint with the top end of the expiratory one-way valve seat 1301. In this way, the expiratory one-way valve seat 1301, the expiratory valve 1009, and the expiratory valve cover 1010 together form an expiratory one-way valve, which functionally corresponds to Figure 1 the expiratory one-way valve 39 in. The expiratory phase assembly 1300 has an expiratory inlet 1302 adjacent to its lower end and an expiratory outlet pipe 1303 adjacent to its upper end formed on the lateral peripheral wall of the valve seat one-way valve seat 1301. The expiratory inlet 1302 of the expiratory phase assembly 1300 can be opened in the X-axis direction and is in sealed butt-joint with the channel 1608 of the expiratory probe base assembly 1600a to receive the patient's exhaled breath from the expiratory probe base assembly 1600a. The expiratory outlet pipe 1303 can extend towards the manual control valve assembly 1800 along the Y-axis direction and can form a port seal butt-joint with the expiratory inlet pipe 1806 of the manual control valve assembly 1800, so that the patient's exhaled breath entering the expiratory phase assembly 1300 can enter the manual control valve assembly 1800 through the expiratory outlet pipe 1303 and the expiratory inlet pipe 1806.

[0074] The expiratory phase assembly 1300 can also be integrated with a connecting pipe 1304. One end of the connecting pipe 1304 is in sealed butt-joint with the pipe 1012 of the loop connection block 1000b (see Figure 3 and Figure 4 ), and the other end is in sealed butt-joint with the mechanical control ventilation channel 1805 of the manual control valve assembly 1800 to form a fluid connection between the coil assembly 2000 and the manual control valve assembly 1800. It should be noted that in Figure 5 , the right end of the connecting pipe 1304 is blocked by the expiratory outlet pipe 1303 and is not visible. Although the connecting pipe 1304 and the expiratory one-way valve seat 1301 have no direct gas flow inside the expiratory phase assembly 1300, the connecting pipe 1304 can be integrally formed with the expiratory one-way valve seat 1301 or fixedly connected together by welding or gluing, etc. This facilitates the simultaneous sealed butt-joint of the expiratory outlet pipe 1303 and the connecting pipe 1304 with the mechanical control ventilation channel 1805 and the expiratory inlet pipe 1806 of the manual control valve assembly 1800 during assembly with a single insertion operation, and enhances the connection stability between the expiratory phase assembly 1300 as a whole and the adjacent components.

[0075] As Figure 5 shown, the manual bag assembly 1700 can include an APL valve seat 1701 that is substantially cylindrical and extends in the vertical (Z-axis direction). Figure 4The APL valve 1017 therein can be installed through the opening of the loop upper cover 1103 onto the valve seat 1701, and the APL valve 1017 can functionally correspond to Figure 1 the APL valve 33 shown in Figure 4 . The valve seat 1701 can be formed with a bellows interface 1702 extending outward in the X-axis direction. Figure 3 and Figure 4 show that the manual bellows joint 1003 can pass through the bellows interface hole 1106 of the loop lower housing 1101 and be hermetically docked with the bellows interface 1702. On the other side opposite to the bellows interface 1702, the valve seat 1701 is also formed with an opening (obscured in the figure) for hermetically docking and fluidly connecting with the manual ventilation port 1804 of the manual mechanical control valve assembly 1800. The manual bellows assembly 1700 further includes a waste discharge pipe 1703, which can be integrally formed with the valve seat 1701 or fixedly connected in a suitable manner. Referring to Figure 1 and

[0076] , the waste discharge pipe 1703 extends along the Y-axis direction to the loop connection block 1000b and forms fluid communication with the waste discharge channel 1013 therein. In this way, the exhaust gas released by the APL valve 1017 can be transported through the waste discharge pipe 1703 to the waste discharge channel 1013 of the loop connection block 1000b, and then flow out of the breathing circuit through the waste discharge interface 1014 of the loop connection block 1000b, for example, flowing to Figure 4 the AGSS shown in Figure 11 . Figure 4 The exhalation valve assembly 1200 shown below has no direct gas communication with other components 1300 - 1800 within the circuit housing 1100. As Figure 3 and Figure 4 show, the exhalation valve assembly 1200 can include an exhalation valve 1205, which can be a pneumatic valve driven by gas. The exhalation valve assembly 1200 can further include a driving gas inlet pipe 1201, a driving gas vent pipe 1202, a waste discharge pipe 1203, and a control gas inlet pipe 1204 extending outward from the exhalation valve 1205. As can be seen more clearly in Figure 4In it, the drive gas inlet pipe 1201 and the control gas inlet pipe 1204 extend along the X-axis direction towards the circuit baffle 1102, but are basically blocked by the exhalation valve 1205 and thus invisible. The exhalation valve assembly 1200 can be an integral assembly or module, that is to say, the exhalation valve 1205 in the exhalation valve assembly 1200 and other components (such as the drive gas inlet pipe 1201, the drive gas vent pipe 1202, the waste discharge pipe 1203 and the control gas inlet pipe 1204 or other components that may be additionally added) are integrally formed or fixedly connected to each other.

[0077] Return Figure 11 , the exhalation valve 1205 can be arranged on the gas flow path between the drive gas inlet pipe 1201 and the waste discharge pipe 1203, and it can adopt any suitable valve structure driven by gas, which will not be described in detail here. The control gas inlet pipe 1204 can receive control gas for controlling the exhalation valve 1205 from an external gas source, and this control gas can be a part of the drive gas provided by the drive gas source, such as Figure 1 the second drive gas 62 in []. During the inhalation cycle in the machine control mode, the pressure of this control gas can cause the exhalation valve 1025 to close, so as to disconnect the gas flow path between the drive gas inlet pipe 1201 and the waste discharge pipe 1203. At this time, the drive gas inlet pipe 1201 receives drive gas from the drive gas source (such as Figure 1 the third drive gas 63 in []), the drive gas from the drive gas inlet pipe 1201 enters the exhalation valve assembly 1200, then is discharged from the exhalation valve assembly 1200 via the drive gas vent pipe 1202, and then is transported to the coil assembly 2000 via the pipe 1011 of the circuit connection block 1000b. During the exhalation cycle in the machine control mode, the drive gas leading to the control gas inlet pipe 1204 and the drive gas inlet pipe 1201 is disconnected, and the exhalation valve 1205 resets to open the gas flow path between the drive gas inlet pipe 1201 and the waste discharge pipe 1203. In this way, the gas from the coil assembly 2000 enters the exhalation valve assembly 1200 from the drive gas vent pipe 1202, and then flows out from the waste discharge pipe 1203. The gas in the waste discharge pipe 1203 flows out to the outside of the breathing circuit via the waste discharge channel 1013 and the waste discharge interface 1014 of the circuit connection block 1000b, for example, flowing towards Figure 1 the AGSS shown in [].

[0078] See Figure 4 and Figure 11, the exhalation valve assembly 1200 may have an exhaust gas inlet pipe 1206 that is in fluid communication with the waste discharge pipe 1203. The exhaust gas inlet pipe 1206 may extend from the exhalation valve 1205 in the X-axis direction towards the loop baffle 1102. The exhaust gas inlet pipe 1206 may receive exhaust gas from other channels outside the exhalation valve assembly 1200 and discharge it via the waste discharge pipe 1203. For example, as mentioned above, from the paramagnetic oxygen sampling port, the sampled gas flowing out of the breathing circuit from the paramagnetic oxygen sampling port can flow back into the breathing circuit through the exhaust gas inlet pipe 1206 after use and be discharged at the waste discharge pipe 1203.

[0079] Based on the foregoing description and with reference to Figure 4 and Figure 5 it can be found that the exhalation valve assembly 1200, the exhalation phase assembly 1300, the inhalation phase assembly 1400, the inhalation probe base assembly 1500a, the inhalation flow probe assembly 1500b, the exhalation probe base assembly 1600a, the exhalation flow probe assembly 1600b, the manual bag assembly 1700, and the manual mechanical control valve assembly 1800 arranged within the loop housing 1100 of the loop body 1000a each form a module respectively, and each module provides a part of the breathing circuit. These modules are separable from each other, and any two interconnected and fluidly communicating modules are connected in a port-sealed docking manner without using any fasteners. Moreover, these modules can all be integral modules. The term "integral module" as used herein and in other parts of this application means that the various functional components within the module are interconnected in an integrally formed or fixedly connected manner so as to be operated as a whole during assembly and connected to other modules or other external functional components. This can be clearly seen through the assembly process described below.

[0080] See Figure 5, during assembly, the inhalation probe base assembly 1500a, the manual bellows assembly 1700, and the exhalation probe base assembly 1600a can be arranged in sequence along the Y-axis direction and placed on the silicone heating sheet 1902. After being pressed tightly by the heating liner 1903, the three assemblies are respectively fixedly connected to the heating liner 1903 from below along the Z-axis direction with fastening screws (not shown). It should be understood that the silicone heating sheet 1902 and the heating liner 1903 here are not used to form the breathing circuit. Therefore, using fastening screws here does not violate the description that no fasteners are used for the connection between the various modules for forming the breathing circuit within the circuit housing 1100 of the circuit main body 1000a mentioned above. Then, the opening 1403 of the inhalation phase assembly 1400 and the channel 1508 of the inhalation probe base assembly 1500a are hermetically docked at the port along the X-axis direction on the side facing away from the inhalation flow probe assembly 1500b. Next, the connection pipe 1304 and the exhalation outlet pipe 1303 of the exhalation phase assembly 1300 are correspondingly inserted into the mechanical control ventilation channel 1805 and the exhalation inlet pipe 1806 of the manual mechanical control valve assembly 1800 in a port-sealed docking manner along the Y-axis direction towards the manual mechanical control valve assembly 1800. After that, the whole formed by plugging the exhalation phase assembly 1300 and the manual mechanical control valve assembly 1800 is docked along the X-axis direction to the exhalation probe base assembly 1600a and the manual bellows assembly 1700, so that the exhalation inlet 1302 of the exhalation phase assembly 1300 and the channel 1608 of the exhalation probe base assembly 1600a are hermetically docked at the port along the X-axis direction on the side facing away from the exhalation flow probe assembly 1600b, and the manual ventilation port 1804 ( Figure 10 ) of the manual mechanical control valve assembly 1800 and the corresponding opening (not shown) of the manual bellows assembly 1700 are hermetically docked at the port. Then, the inhalation flow probe assembly 1500b and the exhalation flow probe assembly 1600b are respectively inserted into the channel 1508 of the inhalation probe base assembly 1500a and the channel 1608 of the exhalation probe base assembly 1600a to form a port-sealed docking. After the above assembly, the assembly B in Figure 4 is formed. Then, in combination with the exhalation valve assembly 1200 shown in Figure 4 which has no direct connection relationship with the assembly B, the connection and arrangement of the various modules within the circuit housing 1100 of the circuit main body 1000a are completed.

[0081] As can be seen from the foregoing assembly process, these modules are separable from each other, thus implementing a split structure different from the existing integral integrated block structure. For the split structure, the structural design of each module has greater freedom. On the one hand, the air passage can be formed in an optimized manner, and the dead volume of the gas path is smaller, so as to improve the gas delivery performance of the breathing circuit structure. On the other hand, functional components (such as oxygen concentration sensors) that cannot be integrated into the circuit body in the prior art can be built into the circuit body, achieving a greater degree of integration. The split structure also enables the functional components required in the breathing circuit to be dispersed and formed in these modules. Once a seal leakage problem occurs, it is easy to detect and determine the specific leakage location; when a certain module is damaged, only this module needs to be replaced, saving costs. When disinfecting the breathing circuit, since the split structure of the present application can form the air passage in an optimized manner and has a smaller dead volume of the gas path as described above, the disinfection effect is better than that of the integral integrated block structure.

[0082] As can also be seen from the foregoing assembly process, for any two modules that need to be directly connected to each other, they are connected in a manner of port-sealed docking without using any fasteners. Moreover, it can also be seen that these modules are arranged in an extended plane (X-Y plane) defined by the X-axis direction and the Y-axis direction; the direction of each port-sealed docking formed between the modules is also within this extended plane or parallel to this extended plane, and even formed along one of the X-axis direction and the Y-axis direction. On the one hand, this makes the connection between the modules very easy to operate. On the other hand, only forming port-sealed docking in two mutually perpendicular directions (X-axis direction and Y-axis direction) can better ensure that an external force is applied in the correct direction during assembly, ensuring the connection and sealing effects of the port-sealed docking. In addition, these modules are arranged in a plane and form a flat cuboid as a whole, which is also suitable for being stably held in a circuit housing 1100 in the shape of a flat cuboid. In addition, the seal between two modules using port-sealed docking is preferably a radial seal method. The seal (such as a sealing ring) is usually located between two mutually facing surfaces of the two modules. For the radial seal method, the two surfaces corresponding to the seal are mutually facing in a direction substantially perpendicular to the docking direction; for the axial seal method, the two surfaces corresponding to the seal are mutually facing along the docking direction. Compared with the axial seal, the port-sealed docking here using the radial seal method does not require additional pressure to maintain the seal. Of course, for the radial seal, it is more suitable for the case where an opening, hole, pipe or channel is sealed and connected to another opening, hole, pipe or channel by inserting one into the other, which will form two mutually facing surfaces in a direction perpendicular to the insertion direction, and the seal can be arranged between these two surfaces.

[0083] Of course, in other embodiments, other ways can be adopted for the division of modules. For example, the inhalation probe base assembly 1500a can be combined with the inhalation phase assembly 1400 into one module, the exhalation probe base assembly 1600a can be combined with the exhalation phase assembly 1300 into one module, and / or, the exhalation check valve seat 1301 and the connecting pipe 1304 of the exhalation phase assembly 1300 can be divided into two modules.

[0084] For various module division methods, each module is preferably formed as an integral module. The integral module mentioned here and in other parts of this application means that the various functional components in the module are connected to each other in an integrally formed or fixedly connected manner, so as to be operated as a whole during assembly and connected to other modules or other external functional components. Figure 4 and Figure 5 The exhalation valve assembly 1200, the exhalation phase assembly 1300, the inhalation phase assembly 1400, the inhalation probe base assembly 1500a, the inhalation flow probe assembly 1500b, the exhalation probe base assembly 1600a, the exhalation flow probe assembly 1600b, the manual breathing bag assembly 1700, and the manual mechanical control valve assembly 1800 shown in

[0085] The assembly process of the breathing circuit structure will be continued below. Refer to Figure 4 , and use fastening screws (not shown) to pass through the circuit lower shell 1101 from the outside of the circuit lower shell 1101 to fix the exhalation valve assembly 1200 and the assembled assembly B to the circuit lower shell 1101. Then, as Figure 5As shown, one end of each of the four sampling tubes 1901 is respectively and correspondingly inserted into the two pipe connectors 1509 and 1510 of the inhalation probe base assembly 1500a and the two pipe connectors 1609 and 1610 of the exhalation probe base assembly 1600a, and the other end of each of the four sampling tubes 1901 is respectively inserted into the four sampling tube interfaces 1811 of the manual control valve assembly 1800, such that these sampling tubes 1901 generally extend on top of each component or module. It should be noted that although the sampling tubes 1901 are located within the circuit housing 1100, such accessories are not included within the scope of the concept of "module" within the circuit housing 1100 described above. Next, the exhalation connector 1001, the inhalation connector 1002, and the manual bellows connector 1003 are respectively passed through the exhalation interface hole 1107, the inhalation interface hole 1105, and the bellows interface hole 1106 extending in the X-axis direction of the circuit lower housing 1101; the three connectors 1001 - 1003 are fixedly pressed with the lock nuts 1018, such that the three connectors 1001 - 1003 respectively form a firm port seal docking with the exhalation flow probe assembly 1600b, the inhalation flow probe assembly 1500b, and the manual bellows assembly 1700 in the X-axis direction, thereby respectively forming fluid communication. This connector installation method enables the connectors to be removed without using tools, and the exhalation flow probe assembly 1600b or the inhalation flow probe assembly 1500b can be directly taken out from the exhalation and inhalation interface holes 1107 and 1105 to facilitate the replacement of the diaphragm in the flow probe assembly.

[0086] Next, the circuit baffle 1102 and the circuit upper cover 1103 are respectively fixedly connected to the circuit lower housing 1101, and then the cover plate 1015 of the circuit connection block 1000b is fixedly connected to the circuit lower housing 1101 in the Y-axis direction with fastening screws (not shown), and then the connection block body 1016 of the circuit connection block 1000b is fixed to the cover plate 1015 with fastening screws (not shown). Next, the inhalation flap 1006 is placed through the opening of the circuit upper cover 1103 on top of the inhalation one-way valve seat 1401 of the inhalation phase assembly 1400, and the inhalation flap cover 1007 is screwed into the corresponding opening of the circuit upper cover 1103, and the exhalation flap 1009 and the exhalation flap cover 1010 are installed in the same manner. After that, the APL valve 1017 is installed through the corresponding opening of the circuit upper cover 1103 on top of the valve seat 1701 of the manual bellows assembly 1700. Then, the carbon dioxide absorption canister 4000 and the water collection cup 1005 are installed at the bottom of the circuit lower housing 1101. Finally, refer to Figure 3, extend the connection part 2005 of the coil assembly 2000 to the bottom of the assembled loop assembly 1000 and fix it with fasteners (not shown); insert the positioning and guiding shafts 3001 and 3002 of the air control connection plate assembly 3000 into the corresponding guiding holes of the loop assembly 1000, and use the hooks 3003 and 2004 to snap-connect to the loop assembly 1000; and insert the oxygen concentration sensor 1008 (such as an oxygen cell) into place from the loop housing 1100.

[0087] It should be noted that the various functional components installed externally to the loop housing 1100 described above, such as the inhalation valve 1006 and the exhalation valve 1009, although they may be or partially be inside the loop housing 1100, are not included within the concept of "module" arranged inside the loop housing 1100 described above. As described above, the exhalation valve assembly 1200, the exhalation phase assembly 1300, the inhalation phase assembly 1400, the inhalation probe base assembly 1500a, the inhalation flow probe assembly 1500b, the exhalation probe base assembly 1600a, the exhalation flow probe assembly 1600b, the manual breathing bag assembly 1700, and the manual mechanical control valve assembly 1800, these "modules" arranged inside the loop housing 1100 of the loop main body 1000a can only be installed and arranged before the loop housing 1100 is closed. The split concept involved in this application only constructs these functional components that need to be arranged inside the loop housing 1100 before the loop housing 1100 is closed into split modules.

[0088] Another feature of this application is described below, which relates to the water collecting cup mentioned in this application. As Figure 4 shown, the water collecting cup 1005 is connected to the water collecting cup joint 1612 of the exhalation probe base assembly 1600a. In the prior art, the water collecting cup that realizes basically the same function is usually arranged at the Figure 2 and Figure 3 shown coil assembly 2000. When changing the position of the water collecting cup from the coil assembly 2000 to the water collecting cup joint 1612 of this application, or adding a water collecting cup at the water collecting cup joint 1612, the inventor of this application surprisingly found that this actually helps to calibrate the exhalation and inhalation flow probes in the breathing circuit structure.

[0089] It should be understood that when calibrating the flow probe in the breathing circuit, the flow probe needs to be kept in the breathing circuit, and at the same time, the outlet side of the flow probe needs to be connected to the ambient air or the atmosphere. In the existing breathing circuit structure, in order to achieve the aforementioned detection environment, cumbersome preparatory work is required. For example, see Figure 4, it is necessary to unscrew the valve caps 1007 and 1010, remove the valves 1006 and 1009, then screw the valve caps 1007 and 1010 back on, and then block one of the expiratory connector 1001 and the inspiratory connector 1002, and so on. In addition, each calibration work can only be performed on one of the expiratory flow probe and the inspiratory flow probe.

[0090] After setting the condensate cup connector 1612 and the condensate cup 1005 in the manner of the present application, simpler preparatory work can be adopted to calibrate the expiratory flow probe and the inspiratory flow probe simultaneously.

[0091] As described above, the condensate cup connector 1612 and the condensate cup 1005 are in Figure 1 the schematic diagram of the breathing circuit can respectively correspond to the condensate cup branch 99 and the condensate cup 65. The following will describe the method for calibrating the flow probes in the breathing circuit structure in combination with Figure 1 and Figure 3 to calibrate the inspiratory flow probe 41 and the expiratory flow probe 40.

[0092] Referring to Figure 3 , a connecting pipe (not shown, such as a corrugated pipe) can be connected between the expiratory connector 1002 and the inspiratory connector 1001 to form fluid communication between the expiratory connector 1002 and the inspiratory connector 1001. The connecting pipe is schematically represented by the dotted line indicated by the reference numeral 97 in Figure 1 . This can be considered in Figure 1 as directly forming fluid communication between the downstream of the inspiratory flow probe 41 and the upstream of the expiratory flow probe 40 with the connecting pipe 97. Referring to Figure 1 , the condensate cup 65 can be detached or separated from the condensate cup branch 99, so that the condensate cup branch 99 is in communication with the external atmosphere. It can be understood that such a flow path is formed, from the fresh gas branch 99 sequentially passing through the inspiratory one-way valve 38, the inspiratory flow probe 41, the inspiratory connector 1001 ( Figure 3 ), the connecting pipe 97, the expiratory connector 1002 ( Figure 3) and the expiratory flow probe 40 until the condensate cup branch 99. This flow path can be used as the detection flow path for the working gas used during calibration. In this way, during calibration, the working gas is injected from the fresh gas branch 98, and this working gas will travel along the aforementioned detection flow path until it flows out from the condensate cup branch 99. By detecting the flow rate of the working gas flowing out from the condensate cup branch 99 and the output signals (such as voltage signals) of the inspiratory flow probe 41 and the expiratory flow probe 40 corresponding to this flow rate, the inspiratory flow probe 41 and the expiratory flow probe 42 can be calibrated simultaneously. If calibrating using the flow rate of the working gas and the output signals of the flow probes is well-known to those skilled in the art, it will not be described in detail here. This application only proposes a new way of forming the detection flow path for this calibration work.

[0093] It should be noted that when calibrating using the detection flow path described above, in order to make the working gas flow out only through the condensate cup branch 99, some preparatory work can be done. When the anesthesia machine has two working modes: manual and machine control, this preparatory work can include: switching the manual / machine control valve 35 to the manual state; blocking the manual bag connector (such as Figure 3 the manual bag connector 1003) in the state of not connecting the manual bag 45; increasing the air pressure threshold of the APL valve 33 so that this air pressure threshold is higher than the maximum value of the normal working air pressure range of the working gas. This preparatory work is significantly less than that in the prior art.

[0094] Finally, it should be noted that the above description is only used to illustrate the technical solution of this application rather than a limitation of the patent protection scope. Those of ordinary skill in the art should understand that without departing from the spirit and scope of the invention, the technical solutions described above can be modified or equivalently replaced, and all should be covered within the scope of the claims of this application.

Claims

1. A split breathing circuit structure for an anesthesia machine, comprising a circuit body, wherein the circuit body comprises a circuit housing and a plurality of modules arranged inside the circuit housing, each module providing a part of the breathing circuit; wherein: The multiple modules are separable from each other; any two modules that are interconnected and fluidly connected are connected in a port-sealed docking manner without using any fasteners.

2. The split breathing circuit structure according to claim 1, characterized in that: The plurality of modules are arranged in an extension plane defined by a first direction and a second direction perpendicular to the first direction.

3. The split breathing circuit structure according to claim 2, characterized in that: The direction of the port sealing abutment is substantially parallel to the extension plane.

4. The split breathing circuit structure according to claim 3, characterized in that: The direction in which the ports are sealed and butted is substantially along one of the first direction and the second direction.

5. The split breathing circuit structure according to claim 1, characterized in that: The multiple modules include at least: a first module, wherein at least an exhalation valve is formed in the first module; a second module, in which at least a valve seat of an air intake check valve is formed; a third module, in which at least a valve seat of an exhalation one-way valve is formed; a fourth module, in which at least a manual machine-controlled valve is formed; and A fifth module, in which at least a valve seat of the APL valve and a manual bladder interface are formed.

6. The split breathing circuit structure according to claim 5, characterized in that: One or more or even all of the first to fifth modules are integral modules.

7. The split breathing circuit structure according to any one of claims 5-6, characterized in that: The plurality of modules are arranged in an extension plane defined by a first direction and a second direction perpendicular to the first direction, and the direction perpendicular to the extension plane is a third direction.

8. The split breathing circuit structure according to claim 7, characterized in that: The exhalation valve in the first module extends in the third direction as a whole; The first module also includes: a driving gas inlet pipe extending from the exhalation valve to the circuit housing along the first direction, for receiving driving gas from the outside; A control gas inlet pipe extending from the exhalation valve to the circuit housing along the first direction, for receiving control gas from the outside to control the state switching of the exhalation valve; a drive gas vent pipe extending from the exhalation valve to the circuit housing along the second direction, for communicating the drive gas between the external coil assembly and the exhalation valve; and a waste pipe extending from the exhalation valve to the circuit housing along the second direction, for conveying waste gas from the exhalation valve to a waste channel; Wherein, the exhalation valve is arranged on the gas flow path between the driving gas inlet pipe and the exhaust pipe; in one working mode, the control gas from the control gas inlet pipe causes the exhalation valve to close to disconnect the gas flow path between the driving gas inlet pipe and the exhaust pipe, and the driving gas from the driving gas inlet pipe enters the first module and then is discharged from the first module through the driving gas ventilation pipe and enters the coil assembly; in another working mode, the control gas leading to the control gas inlet pipe and the driving gas leading to the driving gas inlet pipe are both disconnected, and the exhalation valve is reset to open the gas flow path between the driving gas inlet pipe and the exhaust pipe, and the gas from the coil assembly enters the first module from the driving gas ventilation pipe and then flows out from the exhaust pipe.

9. The split breathing circuit structure according to any one of claims 7-8, characterized in that: An air suction chamber for receiving a sensor is also formed in the second module, and the air suction chamber is in fluid communication with an air outlet passage of the air suction one-way valve.

10. The split breathing circuit structure according to claim 9, characterized in that: The valve seat of the air intake check valve in the second module extends along the third direction as a whole; The suction chamber is located at a lateral peripheral wall of the valve seat of the suction check valve and has a sensor interface for receiving the sensor along the second direction toward the circuit housing; and A first tank connection port is formed at the bottom end of the valve seat of the air intake check valve, wherein the first tank connection port opens downward along the third direction for forming a port sealing docking with the first opening of the carbon dioxide absorption tank.

11. The split breathing circuit structure according to claim 10, characterized in that: A fresh gas pipeline is also formed in the second module for conveying fresh gas containing anesthetic to the inhalation one-way valve; the fresh gas pipeline extends from the valve seat of the inhalation one-way valve along the first direction to the circuit housing.

12. The split breathing circuit structure according to any one of claims 7 to 11, characterized in that: In the fourth module, the manual machine-controlled valve extends substantially along the first direction between the circuit housing and the fifth module, and has: A manual vent, formed at the end of the manual machine-controlled valve facing the fifth module, capable of forming a port-sealed docking with a corresponding opening of the fifth module; a control gas inlet formed at an end of the manual mechanical control valve away from the fifth module and used for receiving a control gas capable of switching a working state of the manual mechanical control valve; a mechanically controlled vent passage extending from the manual mechanically controlled valve in the second direction, for establishing fluid communication with the coil assembly; an exhalation inlet conduit extending from the manual machine-controlled valve along the second direction, and adapted to form a port-sealed docking with the third module; and The air intake outlet interface formed at the bottom of the manual machine-controlled valve and opening downward along the third direction is used to form a port sealing connection with the second opening of the carbon dioxide absorption tank.

13. The split breathing circuit structure according to any one of claims 7 to 12, characterized in that: A connecting pipe is also formed in the third module, which can be connected between the fourth module and the coil assembly to achieve fluid flow therebetween; in the third module, there is no direct gas flow between the connecting pipe and the exhalation one-way valve, and the connecting pipe and the valve seat of the exhalation one-way valve are integrally formed or fixedly connected to each other.

14. The split breathing circuit structure according to claim 13, characterized in that: The valve seat of the exhalation one-way valve in the third module extends along the third direction as a whole, and the valve seat of the exhalation one-way valve is formed with an exhalation inlet opening along the first direction and an exhalation outlet pipe extending along the second direction and facing the fourth module at its lateral peripheral wall; On the other side of the valve seat of the exhalation one-way valve opposite to the exhalation inlet, the connecting pipe extends along the second direction.

15. The split breathing circuit structure according to any one of claims 7 to 14, characterized in that: A waste gas discharge pipe is also formed in the fifth module. The waste gas discharge pipe extends from the valve seat of the APL valve to the circuit housing and is used to transport the waste gas discharged from the APL valve to the waste gas discharge channel. The waste gas discharge pipe and the valve seat of the APL valve are integrally formed or fixedly connected to each other.

16. The split breathing circuit structure according to claim 15, characterized in that: The valve seat of the APL valve extends along the third direction as a whole, and an opening for forming a port sealing connection with the fourth module is formed on a lateral peripheral wall of the valve seat of the APL valve; The manual bladder interface faces the loop housing along the first direction.

17. The split breathing circuit structure according to any one of claims 7 to 16, characterized in that: The circuit body also includes a sixth module and a seventh module located in the circuit housing; The sixth module comprises: Capable of being connected to the exhalation probe base of the third module in a port-sealed docking manner; and The expiratory flow probe can be detachably inserted into the expiratory probe base along the first direction; The seventh module comprises: Capable of being connected to the suction probe base of the second module in a port-sealed docking manner; and The inspiratory flow probe can be detachably inserted into the inspiratory probe base along the first direction.

18. The split breathing circuit structure according to claim 17, characterized in that: A water cup connector is formed at the exhalation probe base, extending downward along the third direction, and is used for connecting a water cup installed outside the loop housing.

19. The split breathing circuit structure according to claim 17, characterized in that: The loop body also includes a plurality of sampling tubes; The exhalation probe base and the inhalation probe base each have a pipe joint extending upward along the third direction; The fourth module has a sampling tube interface leading to the outside of the loop housing; The plurality of sampling tubes extend between the tube connector and the sampling tube interface.

20. The split breathing circuit structure according to any one of claims 1 to 19, characterized in that: A circuit connection block is included, the circuit connection block is located between the coil assembly and the circuit body, and is used to transfer gas between the coil assembly and the circuit body; The circuit connection block further defines an exhaust gas channel therein for receiving the exhaust gas from the circuit body and discharging the exhaust gas to the outside through the exhaust gas channel.

21. The split breathing circuit structure according to any one of claims 1 to 20, characterized in that: The sealing of the port sealing docking is a radial sealing method, in which the sealing member is located between two surfaces of the two modules facing each other in a direction substantially perpendicular to the docking direction of the port sealing docking.

22. An anesthesia machine, comprising the split breathing circuit structure as claimed in claims 1-21.

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