Breathing circuit structure for anaesthesia machine and method for calibrating flow probe

Abstract

The invention relates to a breathing circuit structure of an anaesthesia machine and a method for calibrating a flow probe. The breathing loop structure comprises a water accumulation cup branch which is branched from an expiration flow path between the expiration flow probe and the expiration one-way valve, and a water accumulation cup is detachably connected to the tail end of the water accumulation cup branch. The calibration method comprises the following steps: connecting the connecting pipe between the expiration connector and the inspiration connector to form fluid communication between the expiration connector and the inspiration connector; the water accumulating cup branch is separated from the water accumulating cup, so that the water accumulating cup branch is communicated with the external atmosphere; working gas is injected through the fresh gas branch, sequentially passes through the inspiration one-way valve, the inspiration flow probe, the inspiration connector, the connecting pipe, the expiration connector and the expiration flow probe and finally flows out of the water accumulation cup branch. The flow of the working gas flowing out of the water accumulation cup branch and the output results of the inspiration flow probe and the expiration flow probe corresponding to the flow are detected, so that the inspiration flow probe and the expiration flow probe are calibrated.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and more particularly to a breathing circuit structure for an anesthesia machine and a method for calibrating a flow probe. 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 anesthetic 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 intake side of the driving gas, an expiratory valve on the exhaust side of the driving gas, an absorption canister for absorbing carbon dioxide in the gas, a coil or bellows for isolating the anesthetic gas from the driving gas, a manual-mechanical control valve for switching the breathing circuit between the manual and mechanical 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 in a whole piece of metal. For a plastic integrated block, it usually includes an upper housing and a lower housing, two plastic parts, 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 the present application found that for the aforementioned integrated 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 realized 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 is also a problem 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, there is provided a breathing circuit structure for an anesthesia machine, including: an expiratory flow probe located on the expiratory flow path for detecting the expiratory flow of a patient; and an expiratory one-way valve located on the expiratory flow path and downstream of the expiratory flow probe. The breathing circuit structure further includes a condensate cup branch separated from the expiratory flow path between the expiratory flow probe and the expiratory one-way valve, and a condensate cup is detachably connected to the end of the condensate cup branch for collecting the liquid water formed by the condensation of the water vapor contained in the patient's exhalation; wherein, in the state where the condensate cup is connected to the condensate cup branch, the condensate cup closes the condensate cup branch; in the state where the condensate cup is separated from the condensate cup branch, the condensate cup branch leads to the atmosphere.

[0009] Optionally, the breathing circuit structure further includes an expiratory probe base assembly, the expiratory flow probe can be detachably inserted into the expiratory probe base assembly, the expiratory probe base assembly has a condensate cup joint extending outward, and the condensate cup joint forms a fluid communication with the air flow channel in the expiratory probe base assembly; the condensate cup joint forms the condensate cup branch, and the condensate cup is detachably connected to the condensate cup joint.

[0010] Optionally, the breathing circuit structure further includes a circuit housing, the expiratory probe base assembly and the expiratory flow probe are arranged in the circuit housing, and the condensate cup joint passes through the circuit housing and extends to the outside of the circuit housing.

[0011] Optionally, a plurality of modules are arranged in 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 and in fluid communication with each other are connected in a manner of port-sealed docking without using any fasteners.

[0012] Optionally, the breathing circuit structure further includes: an exhalation connector for installing an exhalation tube leading to the patient; the exhalation flow probe is in fluid communication with the exhalation connector; an inhalation flow probe located on the inhalation flow path for detecting the inhalation flow of the patient; an inhalation connector for installing an inhalation tube leading to the patient; the inhalation flow probe is in fluid communication with the inhalation connector; an inhalation one-way valve located on the inhalation flow path and upstream of the exhalation flow probe; and a fresh gas branch entering the inhalation flow path upstream of the inhalation one-way valve.

[0013] According to another aspect of the present application, an anesthesia machine is provided, including the aforementioned breathing circuit structure.

[0014] According to still another aspect of the present application, a method for calibrating the flow probes in the aforementioned breathing circuit structure is provided, for calibrating the inhalation flow probe and the exhalation flow probe. The method includes: connecting a connecting tube between the exhalation connector and the inhalation connector to fluidly connect the exhalation connector and the inhalation connector; keeping the water trap branch separated from the water trap so that the water trap branch is in communication with the external atmosphere; injecting a working gas through the fresh gas branch, and the working gas sequentially passes through the inhalation one-way valve, the inhalation flow probe, the inhalation connector, the connecting tube, the exhalation connector, the exhalation flow probe, and finally flows out from the water trap branch; detecting the flow of the working gas flowing out from the water trap branch and the output results of the inhalation flow probe and the exhalation flow probe corresponding to this flow, so as to calibrate the inhalation flow probe and the exhalation flow probe.

[0015] Optionally, the breathing circuit structure further includes: a manual-air control valve capable of switching between a manual state and an air control state; and a manual bag connector for connecting a manual bag. The method further includes: switching the manual-air control valve to the manual state; and blocking the manual bag connector in a state where the manual bag is not connected.

[0016] Optionally, the breathing circuit structure further includes an APL valve for controlling the maximum air pressure of the input gas of the manual bag; the method further includes increasing the air pressure threshold of the APL valve so that the air pressure threshold is higher than the maximum value of the normal working air pressure range of the working gas. Description of the Drawings

[0017] Figure 1 is a schematic diagram of a breathing circuit for an anesthesia machine according to the present application;

[0018] Figure 2 is an embodiment of a breathing circuit structure for an anesthesia machine according to the present application;

[0019] Figure 3 is Figure 2 the exploded assembly view of the respiratory circuit structure shown;

[0020] Figure 4 is Figure 3 the exploded assembly view of the circuit components in the respiratory circuit structure shown;

[0021] Figure 5 is Figure 4 the exploded assembly view of assembly B in the circuit components shown;

[0022] Figure 6 is Figure 5 the cross-sectional view of the inhalation phase component in;

[0023] Figure 7 is Figure 5 the exploded assembly view of the inhalation phase component in;

[0024] Figure 8 is Figure 5 the partial cross-sectional view of the inhalation chamber of the inhalation phase component in and the sensor mounting structure it has;

[0025] Figure 9 is in Figure 8 the partial cross-sectional view after installing the oxygen concentration sensor on the basis of;

[0026] Figure 10 is Figure 5 the cross-sectional view of the manual air control valve component in, shown in the air control state; and

[0027] Figure 11 is Figure 4 the cross-sectional view of the exhalation valve component in. Specific embodiments

[0028] The technical solutions of the present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] As Figure 1As shown, the breathing circuit may include a manually controlled valve 35, which can be switched between a manual state and a machine-controlled state, so that the entire breathing circuit can be switched between a manual working mode and a machine-controlled 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 manually controlled valve 35 for controlling the switching of the manually controlled valve 35 between the manual state and the machine-controlled 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 coil 34 to push the existing gas in the coil 34. By controlling the driving gas and the operation of 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 machine-controlled 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.

[0030] Figure 1 The manually controlled valve 35 shown in 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 expiratory valve 32 is in the open state. In this way, the gas exhaled by the patient 42 (usually containing anesthetic drugs) sequentially passes through the expiratory flow probe 40, the expiratory one-way valve 39, and the manually controlled valve 35 and then enters the coil 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 expiratory flow path. The expiratory flow probe 40 and the expiratory one-way valve 39 are located on this expiratory flow path, and the expiratory one-way valve 39 is located downstream of the expiratory flow probe 40. The exhaled gas entering the coil 34 can push the driving gas entering the coil 34 in the previous inhalation cycle to be discharged from the breathing circuit through the expiratory 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 gas-containing gas exhaled by the patient 42 will enter the coil 34 and can be temporarily stored therein and reused by the patient 42 for re-inhalation in the subsequent inhalation cycle. Hereinafter, this recycled anesthetic gas in the breathing circuit is also called recycled gas to distinguish it from the anesthetic gas newly entering the breathing circuit (i.e., fresh gas).

[0031] During the inhalation cycle of patient 42 in the machine-controlled working mode, the exhalation valve 32 is in the closed state. The third driving gas 63 enters the coil 34, pushes the circulating gas stored in the coil 34 out of the coil 34, and enters the carbon dioxide absorption canister 37 through the manual machine control valve 35. Inside the carbon dioxide absorption canister 37, the circulating gas is mixed with the fresh gas that entered here during the exhalation cycle (if there was fresh gas entering the absorption canister 37 before), and is processed by the carbon dioxide absorbent inside the absorption canister 37 to reduce the carbon dioxide content in the anesthetic gas. After the processed anesthetic gas leaves the absorption canister 37, it enters the body (such as the lungs) of patient 42 after passing through the inhalation check valve 38 and the inhalation flow probe 41. Among them, the flow path of patient 42's inhalation between the manual machine control valve 35 and patient 42 can be called the inhalation flow path, and the carbon dioxide absorption canister 37, the inhalation check valve 38, and the inhalation flow probe 41 are arranged in sequence on this inhalation flow path according to the gas flow direction. During this inhalation cycle, according to the previous arrangement or current needs, fresh gas may enter this breathing circuit simultaneously and enter the body of patient 42 together with the anesthetic gas leaving the absorption canister 37. As Figure 1 shown, the fresh gas branch 98 enters this inhalation flow path between the carbon dioxide absorption canister 37 and the inhalation check valve 38, and is upstream of the inhalation check valve 38 on the inhalation flow path.

[0032] Continue to describe the manual working mode of the breathing circuit below in combination with Figure 1 During the inhalation cycle in the manual working state, the operator manually presses the manual bag 45, so that the gas in the manual bag 45 leaves the manual bag 45, and then enters the carbon dioxide absorption canister 37 through the manual machine control valve 35. The gas in the absorption canister 37 leaves the absorption canister 37 after being processed by the carbon dioxide absorbent inside it, and then enters the body of patient 42 together with the fresh gas mixed with anesthetic drugs after passing through the inhalation check valve 38 and the inhalation flow probe 41 in sequence. The APL valve (adjustable pressure limiting valve) 33 is used to control the maximum air pressure of the input gas of the manual bag 45, that is, when the gas pressure generated by pressing the manual bag 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.

[0033] During the exhalation cycle in the manual operation mode, the states of the aforementioned inhalation valve 28, solenoid valve 27, manual pneumatic control valve 35, and exhalation valve 32 are maintained 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, exhalation check valve 39, and manual pneumatic control valve 35 and then enters the manual bellows 45, causing the manual bellows 45 to expand. During this exhalation cycle, fresh gas can also enter the absorption canister 37 so as to flow to the patient 42 together with the gas from the manual bellows 45 during the subsequent inhalation cycle.

[0034] It should be noted that, in the Figure 1 shown breathing circuit, a branch 99 can be led out on the exhalation 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 referred to as the water trap branch. The liquid water formed by the condensation of the water vapor contained in the exhalation of the patient 42 can be collected into this 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 close the water trap branch 99; when the water trap 65 and the water trap branch 99 are in a separated state, 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.

[0035] Figure 1 The inhalation valve 28, IP valve 30, solenoid valve 27, air resistance 29, safety valve 31, and filter 6 are also shown in the

[0036] Figure 2 shown breathing circuit structure can be used to implement the Figure 1 part surrounded by the dashed box A in the Figure 2 shown breathing circuit. As Figure 1 shown, this 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 canister 4000. The coil assembly 2000 can basically correspond to the Figure 1 coil 34 in the Figure 1 , and the carbon dioxide absorption canister 4000 can basically correspond to the Figure 1As shown, the required inhaled gas is provided to the patient 42 and the gas exhaled by the patient 42 is received. The exhalation connector 1001 and the inhalation connector 1002 can be formed in a curved shape and have a section extending downward or obliquely downward after being installed in place. Such connectors are more convenient for the operator to manually install the breathing tube and the suction tube. In particular, for the exhalation connector 1001, compared with a connector extending linearly, in the case where water vapor in the patient's exhaled breath 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 can also include a manual resuscitator connector 1003 for connecting a manual resuscitator 45 as shown in Figure 1 . The carbon dioxide absorption canister 4000 can be a soda lime canister or can be an adsorption device containing other types of carbon dioxide adsorbents. The air control connection plate assembly 3000 can be used as an interface between the fresh gas to enter the breathing circuit in Figure 1 and the first to third drive gases 61 - 63 and the circuit assembly 1000.

[0037] As shown in Figure 3-4 in the exploded view, the circuit assembly 1000 can include a circuit main body 1000a and a circuit connection block 1000b detachably connected to the circuit main body 1000a. The circuit connection block 1000b can include a connection block main body 1016 and a cover plate 1015 detachably connected to the connection block main body 1016, wherein the cover plate 1015 is visible in Figure 4 and invisible in Figure 3 so as 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 the circuit main body 1000a. For this purpose, the circuit connection block 1000b can include pipes 1011 and 1012, and their ends facing the coil assembly 2000 (the ends are invisible due to occlusion in Figure 3 and visible in Figure 4 ) can be hermetically docked with the gas ports 2001 and 2002 of the coil assembly 2000 respectively in the assembled state, and their ends 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 inserting one into the other or directly abutting against each other and optionally using a sealing member such as a sealing ring for sealing connection and maintaining fluid communication between the two.

[0038] The circuit connection block 1000b may further include a waste discharge channel 1013 formed within the connection block body 1016. Exhaust gas to be discharged from the breathing circuit can enter the waste discharge channel 1013 from the circuit body 1000a and flow out to the outside of the breathing circuit via the waste discharge interface 1014, for example, flowing towards Figure 1 the AGSS shown in. See Figure 4 , the cover plate 1015 may be sealingly connected to the connection block body 1016 and, in the assembled state, may define, together with the connection block body 1016, the waste discharge channel 1013 as Figure 3 shown.

[0039] The coil assembly 2000 may include an upper housing 2003 and a lower housing 2004 that are detachably connected to each other and define a curved and extending air flow channel (not shown) therebetween. The two ends of the air flow channel respectively terminate at the gas ports 2001 and 2002. Similar to the coil 34 described above in conjunction with Figure 1 , the coil assembly 2000 can receive and discharge the drive gas (such as the third drive gas 63) and, at the same time, can accommodate reusable anesthetic gas (i.e., recycled gas). The drive gas and the recycled gas can enter and leave the coil assembly 2000 via the gas ports 2001 and 2002 of the coil assembly 2000 and enter and leave the circuit body 1000a via the pipes 1011 and 1012 of the circuit connection block 1000b of the circuit assembly 1000 to allow the required flow of the third drive gas 63 and the recycled gas during the exhalation cycle and the inhalation cycle of the patient 42 in the machine-controlled operating mode described above. In addition, the coil assembly 2000 may have a connecting portion 2005 extending outward from its lower housing 2004. In the assembled state, the connecting portion 2005 may extend to the lower side of the circuit connection block 1000b and may be detachably connected to the circuit connection block 1000b using a fastener (such as a handwheel, not shown).

[0040] The air control connection plate assembly 3000 may include positioning guide shafts 3001 and 3002 and hooks 3003 and 3004 so that the air control connection plate assembly 3000 can be detachably connected to the circuit assembly 1000. During assembly, the positioning guide shafts 3001 and 3002 of the air control connection plate assembly 3000 can be respectively aligned with corresponding receiving holes (not shown) of the circuit assembly 1000 and inserted until the hooks 3003 and 3004 are respectively snapped into corresponding hooks (not shown) of the circuit assembly 1000. The positions of the positioning guide shafts 3001 and 3002 and the corresponding receiving holes of the circuit assembly 1000 are preset so that after assembly, each interface at the air control connection plate assembly 3000 can be precisely aligned with the corresponding interface at the circuit assembly 1000. It should be noted that the positioning guide shaft 3001 and the hook 3003 can be inserted into the circuit connection block 1000b of the circuit assembly 1000, while the positioning guide shaft 3002 and the hook 3004 can be inserted into the circuit main body 1000a of the circuit assembly 1000. This arrangement helps to further strengthen the structural stability between the circuit connection block 1000b and the circuit main body 1000a of the circuit assembly 1000 in the assembled state.

[0041] In addition, in order 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 main 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.

[0042] The circuit main body 1000a can be integrally formed into a flat block substantially in the shape of a cuboid, which may include a circuit housing 1100 and functional components mounted on and received within the circuit housing 1100. Different from the prior art implementation using an integrated block, the functional components received within 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, in Figure 4 and Figure 5The 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.

[0043] Figure 4 An exploded view of the loop assembly 1000 is shown, where the remaining part except the loop connection block 1000b and the absorption tank 4000 belongs to Figure 3 the loop main body 1000a shown in Figure 4 As shown in Figure 3 The loop housing 1100 identified in Figure 5 itself may include a loop lower shell 1101, a loop baffle 1102, and a loop upper cover 1103. The functional components accommodated in the loop housing 1103 may include an exhalation valve assembly 1200 and an assembly assembled together as indicated by arrow B. The functional components included in this assembly B are further separated from each other in Figure 1 to clearly show the structure, mutual connection, and arrangement relationship of each functional component under the split concept. The reason for dividing the functional components inside the loop main body 1000a into the exhalation valve assembly 1200 and the assembly B is that: inside the loop 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 components) included in the assembly B. The exhalation valve assembly 1200 can basically correspond functionally to

[0044] Refer to Figure 5 , this 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 bag assembly 1700, and a manual mechanical control valve assembly 1800. The listed components are separated from each other and can be detachably assembled together.

[0045] 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 1The inspiratory flow probe 41 shown in the figure is used to detect the inspiratory flow of the patient. The inspiratory flow probe assembly 1500b can generally be a long cylindrical shape with both ends open, defining an air flow channel 1503 therein. Among them, the inspiratory flow probe assembly 1500b and its air flow channel 1503 can extend substantially along the X-axis direction. The inspiratory flow probe assembly 1500b has a first through hole 1504 and a second through hole 1505 on its cylindrical wall. The first and second through holes 1504 and 1505 can extend substantially 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. On the outer side of the cylindrical wall of the inspiratory flow probe assembly 1500b, a first sealing ring 1506 and a second sealing ring 1507 are arranged, 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.

[0046] The inspiratory probe base assembly 1500a can generally be formed into a cuboid-shaped block, and a channel 1508 extending along the X-axis direction can be formed therein. On the one hand, the channel 1508 defines the air flow channel in the breathing circuit, and on the other hand, it is used to receive the inspiratory flow probe assembly 1500b to be inserted. The inspiratory probe base assembly 1500a can also have a first pipe joint 1509 and a second pipe joint 1510 extending along the Z-axis direction on its outer side, and are located on a straight line along the X-axis direction.

[0047] In the assembled state of the inspiratory flow probe assembly 1500b and the inspiratory probe base assembly 1500a, the inspiratory flow probe assembly 1500b is inserted into the inspiratory probe base assembly 1500a. In this assembled state, the first through hole 1504 and the second through hole 1505 of the inspiratory flow probe assembly 1500b are respectively aligned with the first pipe joint 1509 and the second pipe joint 1510 of the inspiratory probe base assembly 1500a and form a fluid connection. To facilitate this alignment, the inspiratory flow probe assembly 1500b has an alignment mark 1511 at its outer end, and the 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, see Figure 4, at the top of the air intake interface hole 1105 of the lower circuit housing 1101 along the Z-axis direction, there is a notch that mates with the alignment mark 1511. In this way, after the air intake probe base assembly 1500a is installed in place at the lower circuit housing 1101, when the air intake flow probe assembly 1500b is passed through the air intake interface hole 1105 and then inserted into the channel 1508 of the air intake probe base assembly 1500a, as long as the alignment mark 1511 is aligned with the notch of the air intake interface hole 1105 and enters the notch, the alignment between the through holes 1504 and 1505 and the pipe connectors 1509 and 1510 can be achieved in the rotational direction around the X-axis. To achieve alignment in the linear direction along the X-axis, the dimensions of the pre-designed components can be such that when the air intake flow probe assembly 1500b is inserted until it can no longer be further inserted, it is in the alignment position in the linear direction along the X-axis.

[0048] The exhalation flow probe assembly 1600b can be detachably inserted into the exhalation probe base assembly 1600a. The exhalation flow probe assembly 1600b can basically correspond functionally to Figure 1 the exhalation flow probe 40 shown in [reference], and is used to detect the exhalation flow of the patient. The exhalation flow probe assembly 1600b can have basically the same structure as the air intake flow probe assembly 1500b, and the difference may be that: the directions of the airflow flowing through the probes are different when the two flow probe assemblies are working, so the bending directions of the elastic diaphragms inside them are different. Therefore, in order to distinguish the two flow probe assemblies and avoid confusion, the external dimensions of the alignment mark (not marked) of the exhalation flow probe assembly 1600b can be different from those of the alignment mark 1511 of the air intake 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.

[0049] The exhalation probe base assembly 1600a can have basically the same structure as the air intake probe base assembly 1500a. Among them, the exhalation probe base assembly 1600a can include a channel 1608 that is basically the same as the channel 1508, and pipe connectors 1609 and 1610 that are basically the same as the pipe connectors 1509 and 1510. Moreover, the relative arrangement positions between the exhalation flow probe assembly 1600b and the exhalation probe base assembly 1600a are also basically the same as those between the air intake flow probe assembly 1500b and the exhalation probe base assembly 1600a. The difference between the exhalation probe base assembly 1600a and the air intake probe base assembly 1500a is that the exhalation probe base assembly 1600a has a condensate cup connector 1612 for connecting Figure 4 the condensate cup 1005 shown in [reference]. The condensate cup 1005 can basically correspond functionally to Figure 1 the condensate cup 65 shown in [reference], and the condensate cup connector 1612 can basically correspond functionally to Figure 1The condensate cup branch 99 shown in Figure 4 As shown, the condensate cup joint 1612 extends outward in the Z-axis direction at the lower part of the exhalation probe base assembly 1600a, and passes downward through the lower circuit housing 1101 and extends out of the lower circuit housing 1101 in the assembled state, so as to facilitate connecting the condensate cup 1005 to the condensate cup joint 1512 or disconnecting the condensate cup 1005 from the condensate cup joint 1512 outside the circuit housing 1100 ( Figure 3 ). The condensate cup joint 1612 can communicate with the air flow channel defined inside the exhalation probe base assembly 1600a. In this way, 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 joint 1612.

[0050] See Figure 4 , in the assembled state, the inhalation phase assembly 1400 forms a port seal docking with the inhalation probe base assembly 1500a on the other side opposite to the inhalation flow probe assembly 1500b. More specifically, see Figure 5 , the channel 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 used functionally to implement Figure 1 the inhalation one-way valve 38 in Figure 1 , and is also used to receive

[0051] The inhalation phase assembly 1400 includes an inhalation one-way valve seat 1401 that extends substantially cylindrically in the vertical (Z-axis direction). Figure 4 The inhalation flap 1006 in Figure 1 can be used as the valve core of the inhalation one-way valve, and can be placed at the top end of the inhalation one-way valve seat 1401 through the opening of the upper circuit cover 1103 during assembly. Then, the inhalation flap cover 1007 is screwed into the opening of the upper circuit cover 1103 so that its lower end is in sealed docking with the top end of the inhalation one-way valve seat 1401. In this way, the inhalation one-way valve seat 1401, the inhalation flap 1006, and the inhalation flap cover 1007 together form an inhalation one-way valve, so as to functionally correspond to

[0052] In Figure 5As can be seen, the inspiration phase component 1400 further includes a fresh gas pipeline 1404. Fresh gas containing anesthetic from a fresh gas source can enter the inspiration one-way valve via the fresh gas pipeline 1404. The fresh gas pipeline 1404 can extend from the inspiration one-way valve seat 1401 in the X-axis direction to the circuit baffle 1102 of the circuit housing, and then be connected to a fresh gas source (not shown) at the air control connection plate assembly 3000. This can be referred to Figure 3 and Figure 4 to learn. Although the fresh gas pipeline 1404 is not visible in Figure 3 and Figure 4 because it is blocked or covered.

[0053] Figure 6 shows Figure 5 a cross-sectional view of the inspiration phase component 1400 of Figure 6 taken along the central axis C of the inspiration one-way valve and in the Y-Z plane, and additionally shows the assembled inspiration flap 1006 and inspiration flap cover 1007. As Figure 6 shows, the inspiration one-way valve seat 1401 has a first tank connection port 1406 at its bottom end and an intake channel 1405 extending in the vertical (Z-axis direction). The first tank connection port 1406 and the intake channel 1405 are in fluid communication. 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 inspiration one-way valve seat 1401 has a sandwich structure in its upper part, so as to define an outlet channel 1407 between the sandwich structures. The inspiration flap 1006 is located on the flow path between the intake channel 1405 and the outlet channel 1407, and is arranged to allow the patient's inspiration to flow from the intake channel 1405 to the outlet channel 1407, and not allow gas to flow from the outlet channel 1407 to the intake channel 1405. Figure 6 An opening 1408 can also be seen in Figure 5 . The fresh gas pipeline 1404 in Figure 5 communicates with the intake channel 1405 of the inspiration one-way valve seat 1401 at the opening 1408. Figure 6 A blind hole 1409, and openings 1410 and 1411 can also be seen in Figure 3 . Among them, the blind hole 1409 can be used to receive Figure 3 the guide shaft 3002 of the air control connection plate assembly 3000 in

[0054] . The inspiration chamber 1402 can be in fluid communication with the outlet channel 1407 of the inspiration one-way valve seat 1401. In this way, the patient's inspiration will enter the inspiration chamber 1402 from the outlet channel 1407. AsFigure 7 As shown, the inhalation chamber 1402 may 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.

[0055] See Figure 7-Figure 9 , the sensor mounting structure may include a mounting base 1412 formed at the first side wall 1415 of the inhalation chamber 1402. The mounting base 1412 may include, for example, a circular cylinder 1414 that defines an elongated guide hole 1413 therein. The guide hole 1413 may be formed as a blind hole with a closed outer end. The extending direction of the guide hole 1413 is substantially along the Figure 5 Y-axis direction (i.e., the second direction) shown in. The push rod 1416 is arranged inside the chamber 1402 and has a rod portion 1417 and a plugging portion 1418. The plugging portion 1418 may be formed at the right end of the rod portion 1417. The rod portion 1417 of the push rod 1416 may extend into the guide hole 1413. The guide hole 1413 may receive and guide the rod portion 1417 of the push rod 1413, so that the push rod 1416 can reciprocate along the extending direction of the guide hole 1413 (i.e., the second direction). The mounting base 1412 may further include a circumferentially extending groove 1428 outside the cylinder 1414 for accommodating the end of the biasing spring 1414 facing the mounting base 1412.

[0056] The mounting base 1412 may be integrally formed with the first side wall 1415 of the inhalation chamber 1402 and may protrude from the first side wall 1415 toward the outside of the chamber to reduce the occupation of the internal volume of the chamber.

[0057] A sensor interface 1420 may be formed at the second side wall 1419 opposite to the first side wall 1415 along the second direction. The sensor interface 1420 may be generally cylindrical as a whole and defines a mounting through hole 1421 therein. The sensor interface 1420 may 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 may 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 ).

[0058] The biasing spring 1424 may 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 8As 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 portion 1422 of the sensor interface 1420, so as to close the installation through hole 1421 of the sensor interface 1420 on one side.

[0059] The blocking portion 1418 of the push rod 1416 includes an enlarged portion 1425 that is larger in transverse dimension relative to the rod portion 1417, and the size of the enlarged portion 1425 is suitable for abutting against the first end portion 1422 of the sensor interface 1420 in the case where the oxygen concentration sensor is not installed ( Figure 8 ). The biasing spring 1424 can be a helical spring surrounding the rod portion 1417 of the push rod 1416, and the helical spring is restricted in a compressed state between the mounting seat 1412 and the enlarged portion of the blocking portion 1418. In this way, on the one hand, the enlarged portion 1425 of the push rod 1416 is used to block the installation through hole 1421 of the sensor interface 1420, and on the other hand, it is also used to limit the biasing spring 1424.

[0060] The blocking portion 1418 of the push rod 1416 may further include a seal ring bearing portion 1426 and a first seal ring 1427, and 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 installation through hole 1421 of the sensor interface 1420, so that the first seal ring 1427 is located between the inner peripheral wall of the installation through hole 1421 and the outer peripheral wall of the seal ring bearing portion 1426 and plays a sealing role between the two.

[0061] Refer to Figure 9 , the oxygen concentration sensor 1008 can be inserted into the sensor interface 1420 at the second end portion 1423 of the sensor interface 1420. The detection end portion 1008a of the oxygen concentration sensor 1008 passes through the installation through hole 1421 of the sensor interface 1420 and extends out from the first end portion 1422 of the sensor interface 1420 to enter the interior of the chamber 1420 to detect the oxygen concentration in the gas therein. During the insertion of the oxygen concentration sensor 1008, its detection end portion 1008a will push the blocking portion 1418 of the push rod 1416 away from the first end portion 1422 of the sensor interface 1420. The oxygen concentration sensor 1008 may be provided with a second seal ring 1008b on its outer peripheral wall. In the case where the oxygen concentration sensor 1008 is installed in place, the second seal ring 1008b is located between the inner peripheral wall of the installation 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.

[0062] In addition, an internal thread (clearly visible in the figure, not marked) may be formed at the second end 1423 of the sensor interface 1420, and an external thread matching the internal thread may be formed at the outer peripheral wall of the oxygen concentration sensor 1008. In this way, the oxygen concentration sensor 1008 may be inserted into the sensor interface 1420 in a screwed manner, and a stable connection between the oxygen concentration sensor 1008 and the sensor interface 1420 is achieved.

[0063] return Figure 7 The second side wall 1419 of the suction chamber 1402 may be detachable, and the sensor interface 1420 may be integrally formed with the second side wall 1419 and sealedly connected to the suction chamber 1402 using a fastener 1429 and a sealing ring 1430 .

[0064] Reference below Figure 4 , Figure 5 and Figure 10 To illustrate the manual machine control valve assembly 1800, its function can basically correspond to Figure 1 The manual machine-controlled valve 35 in the circuit housing 1100. The manual machine-controlled valve assembly 1800 can be extended along the X-axis direction as a whole, one end of which is located at the housing baffle 1102 of the circuit housing 1100, and the other opposite end can form a port seal docking with the manual leather bag assembly. The manual machine-controlled valve assembly 1800 may include a control gas inlet 1801 for receiving control gas, a manual vent 1804 in fluid communication with the manual leather bag, a machine-controlled ventilation channel 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 inhalation outlet interface 1807 in fluid communication with the second opening 4002 of the carbon dioxide absorption tank 4000. The manual vent 1804 can be formed at the end of the manual machine-controlled valve assembly 1800 facing the manual leather bag assembly 1700, and can form a port seal docking with the corresponding opening of the manual leather bag assembly 1700. The control gas inlet 1801 is located at the end of the manual mechanical control valve assembly 1800 away from the manual bellows assembly 1700, and can receive a driving gas (eg, Figure 1 The first driving gas 61 in the manual machine-controlled valve is used to change the working state of the manual machine-controlled valve under the pressure of the control gas, so that it can be selectively in one of the machine-controlled state and the manual state. The machine-controlled ventilation channel 1805 and the exhalation inlet pipe 1806 can extend from the manual machine-controlled valve assembly 1800 along the Y-axis direction, and the inhalation outlet interface 1807 is formed at the bottom of the manual machine-controlled valve assembly 180 and opens downward along the Z-axis direction. Inside the manual machine-controlled valve assembly 1800, the exhalation inlet pipe 1806 and the inhalation outlet interface 1807 are connected to the machine-controlled ventilation channel 1805 via the internal channel 1810.

[0065] The driving gas entering the interior of the manual pneumatically controlled valve assembly 1800 via the pneumatic control inlet 1801 will force the diaphragm 1802 to move to the left (away from the pneumatic control inlet 1801), and this diaphragm 1802 will then push the bracket 1808 with the sealing diaphragm 1803 to move to the left until the manual ventilation port 1804 of the manual pneumatically controlled valve assembly 1800 is closed, that is, the sealing diaphragm 1803 is at the Figure 10 position currently shown in. At this time, the manual pneumatically controlled valve assembly 1800 is in the pneumatically controlled state, and the biasing spring 1809 that was originally in the compressed state is further compressed. In this pneumatically controlled state, during the patient's exhalation cycle, the patient's exhaled breath enters the manual pneumatically controlled valve assembly 1800 from the exhalation inlet pipe 1806, and then flows out from the pneumatically controlled ventilation passage 1805 and flows towards the coil assembly 2000; during the patient's inhalation cycle, the gas from the coil assembly 2000 enters the manual pneumatically controlled valve assembly 1800 from the pneumatically controlled ventilation passage 1805, and then flows out from the inhalation outlet interface 1807 and flows towards the carbon dioxide absorption canister 4000.

[0066] When switching the manual pneumatically controlled valve assembly 1800 from the Figure 10 shown pneumatically controlled state to the manual state, first cut off the driving gas from the pneumatic control inlet 1801. In this way, the compressed biasing spring 1809 starts to recover, and 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 pneumatically controlled 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 pneumatically controlled valve assembly 1800 from the exhalation inlet pipe 1806, and then flows out from the manual ventilation port 1804 and flows towards the manual bellows; during the patient's inhalation cycle, the gas from the manual bellows enters the manual pneumatically controlled valve assembly 1800 from the manual ventilation port 1804, and then flows out from the inhalation outlet interface 1807 and flows towards the carbon dioxide absorption canister 4000.

[0067] The manual pneumatically controlled valve assembly 1800 may further include a sampling tube interface 1811 at its top for connecting the sampling tube 1901 of the flow probe, which can be seen in Figure 5 . As Figure 5 shown, the manual pneumatically controlled 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 joints 1509 and 1510 of the inhalation probe base assembly 1500a and two pipe joints 1609 and 1610 of the exhalation probe base assembly 1600a.

[0068] See Figure 5, during the expiratory phase, the expiratory phase component 1300 may include an essentially cylindrical expiratory one-way valve seat 1301 extending along the vertical direction (Z-axis direction). Figure 4 The expiratory flap 1009 in Figure 1 can be used as the valve core of the expiratory one-way valve and can be placed at the top end of the expiratory one-way valve seat 1301 through the opening of the upper cover 1103 of the loop during assembly. Then, the expiratory flap cover 1010 is screwed into the opening of the upper cover 1103 of the loop, and its lower end is hermetically docked with the top end of the expiratory one-way valve seat 1301. In this way, the expiratory one-way valve seat 1301, the expiratory flap 1009, and the expiratory flap cover 1010 together form an expiratory one-way valve, so as to functionally correspond to the expiratory one-way valve 39 in

[0069] The expiratory phase component 1300 is formed with an expiratory inlet 1302 adjacent to its lower end and an expiratory outlet duct 1303 adjacent to its upper end on the lateral peripheral wall of the valve seat one-way valve seat 1301. The expiratory inlet 1302 of the expiratory phase component 1300 can open towards the X-axis direction and is hermetically docked with the channel 1608 of the expiratory probe base component 1600a to receive the patient's exhaled breath from the expiratory probe base component 1600a. The expiratory outlet duct 1303 can extend towards the manual control valve component 1800 along the Y-axis direction and can form a port seal docking with the expiratory inlet duct 1806 of the manual control valve component 1800, so that the patient's exhaled breath entering the expiratory phase component 1300 can enter the manual control valve component 1800 through the expiratory outlet duct 1303 and the expiratory inlet duct 1806.

[0069] The expiratory phase component 1300 may also be integrated with a connecting pipe 1304. One end of the connecting pipe 1304 is hermetically docked with the pipe 1012 of the loop connection block 1000b (see Figure 3 and Figure 4 ), and the other end is hermetically docked with the mechanical control ventilation channel 1805 of the manual control valve component 1800 to form a fluid connection between the coil assembly 2000 and the manual control valve component 1800. It should be noted that in Figure 5 , the right end of the connecting pipe 1304 is blocked by the expiratory outlet duct 1303 and is not visible. Although there is no direct gas flow between the connecting pipe 1304 and the expiratory one-way valve seat 1301 inside the expiratory phase component 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., which is convenient for simultaneously hermetically docking the expiratory outlet duct 1303 and the connecting pipe 1304 with the mechanical control ventilation channel 1805 and the expiratory inlet duct 1806 of the manual control valve component 1800 by a single insertion operation during assembly, and enhances the connection stability between the expiratory phase component 1300 as a whole and adjacent components.

[0070] As shown in Figure 5As shown, the manual bellows assembly 1700 may include a substantially cylindrical APL valve seat 1701 extending along the vertical direction (Z-axis direction). Figure 4 The APL valve 1017 in Figure 1 may be installed through an opening in the upper cover 1103 of the circuit to the valve seat 1701, and the APL valve 1017 may functionally correspond to the APL valve 33 shown in Figure 4 . The valve seat 1701 may be formed with a bellows interface 1702 extending outward in the X-axis direction. The manual bellows joint 1003 shown in Figure 3 and Figure 4 can pass through the bellows interface hole 1106 of the lower housing 1101 of the circuit 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 may be integrally formed with the valve seat 1701 or fixedly connected in a suitable manner. Referring to Figure 1 , the waste discharge pipe 1703 extends along the Y-axis direction to the circuit connection block 1000b and forms fluid communication with the waste discharge channel 1013 therein. In this way, the waste gas released by the APL valve 1017 can be transported through the waste discharge pipe 1703 to the waste discharge channel 1013 of the circuit connection block 1000b, and then flow out of the breathing circuit through the waste discharge interface 1014 of the circuit connection block 1000b, for example, flowing to the AGSS shown in

[0071] The exhalation valve assembly 1200 shown below Figure 4 has no direct gas communication with other components 1300 - 1800 within the circuit housing 1100. As shown in Figure 11 , the exhalation valve assembly 1200 may include an exhalation valve 1205, which may be a pneumatic valve driven by gas. The exhalation valve assembly 1200 may further include a driving gas inlet pipe 1201, a driving gas ventilation pipe 1202, a waste discharge pipe 1203, and a control gas inlet pipe 1204 extending outward from the exhalation valve 1205. As seen more clearly in Figure 4 , the exhalation valve 1205 may extend integrally along the Z-axis direction, and the driving gas ventilation pipe 1202 and the waste discharge pipe 1203 extend substantially along the Y-axis direction towards the left side of the lower housing 1101 of the circuit. Refer to Figure 3 and Figure 4, the drive gas ventilation pipe 1202 can pass through the pipeline 1011 of the loop lower housing 1101 and the loop connection block 1000b in the Y-axis direction to form a port seal docking, and the waste discharge pipe 1203 can pass through the loop lower housing 1101 in the Y-axis direction and form a fluid connection with the waste discharge channel 1013 in the loop connection block 1000b. In Figure 4 In it, the drive gas inlet pipe 1201 and the control gas inlet pipe 1204 extend along the X-axis direction towards the loop baffle 1102, but are not visible because they are basically blocked by the exhalation valve 1205. 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 ventilation 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.

[0072] 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 the 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 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 the 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 ventilation pipe 1202, and then is transported to the coil assembly 2000 via the pipeline 1011 of the loop 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 is reset 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 ventilation 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 loop connection block 1000b, for example, flowing towards Figure 1 the AGSS shown in.

[0073] 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 along 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, for 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.

[0074] 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 expiratory phase assembly 1300, the inspiratory phase assembly 1400, the inspiratory probe base assembly 1500a, the inspiratory flow probe assembly 1500b, the expiratory probe base assembly 1600a, the expiratory 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 manner of port-sealed docking 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 a manner of one-piece molding or fixed connection 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.

[0075] See Figure 5, during assembly, the suction 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 the connections between the various modules for forming the breathing circuit within the circuit housing 1100 of the circuit body 1000a do not use any fasteners. Then, the opening 1403 of the inhalation phase assembly 1400 and the channel 1508 of the suction probe base assembly 1500a are hermetically docked in the port along the X-axis direction on the side facing away from the suction flow probe assembly 1500b. Next, the connecting 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-sealing docking manner along the Y-axis direction towards the manual mechanical control valve assembly 1800. After that, the overall formed by docking 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 in 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 in the port. Then, the suction flow probe assembly 1500b and the exhalation flow probe assembly 1600b are respectively inserted into the channel 1508 of the suction probe base assembly 1500a and the channel 1608 of the exhalation probe base assembly 1600a to form a port-sealing 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 body 1000a are completed.

[0076] 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, an 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 could not be integrated in the circuit main body in the prior art can be built into the circuit main 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 an 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.

[0077] 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, or 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, forming port-sealed docking only in two mutually perpendicular directions (X-axis direction and Y-axis direction) can also 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, forming 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.

[0078] Of course, in other embodiments, the modules may be divided in other ways. For example, the inhalation probe base assembly 1500a may be combined with the inhalation phase assembly 1400 into one module, the exhalation probe base assembly 1600a may be combined with the exhalation phase assembly 1300 into one module, and / or the exhalation one-way valve seat 1301 and the connecting pipe 1304 of the exhalation phase assembly 1300 may be divided into two modules.

[0079] For various module division methods, it is preferable that each module forms 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 a one-piece molding or fixed connection 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 bag assembly 1700, and the manual mechanical control valve assembly 1800 shown in

[0080] The assembly process of the breathing circuit structure will be continued below. Refer to Figure 4 , use fastening screws (not shown) to pass through the outer part of 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 air control valve assembly 1800, so that these sampling tubes 1901 generally extend on the top of each component or module. It should be noted that although the sampling tubes 1901 are located within the loop housing 1100, such accessories are not included in the scope of the concept of "module" within the loop 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 loop lower housing 1101; the three connectors 1001-1003 are fixedly pressed with the lock nuts 1018, so that the three connectors 1001-1003 respectively form a stable 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.

[0081] Next, the loop baffle 1102 and the loop upper cover 1103 are respectively fixedly connected to the loop lower housing 1101, and then the cover plate 1015 of the loop connection block 1000b is fixedly connected to the loop lower housing 1101 in the Y-axis direction with fastening screws (not shown), and then the connection block body 1016 of the loop 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 loop upper cover 1103 on the 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 loop upper cover 1103, and the exhalation flap 1009 and the exhalation flap cover 1010 are installed in the same way. After that, the APL valve 1017 is installed through the corresponding opening of the loop upper cover 1103 on the top of the valve seat 1701 of the manual bellows assembly 1700. Then, the carbon dioxide absorption canister 4000 and the water collecting cup 1005 are installed at the bottom of the loop lower housing 1101. Finally, refer to Figure 3, extend the connecting part 2005 of the coiled tube assembly 2000 to the bottom of the assembled loop assembly 1000 and fix it with fasteners (not shown); insert the positioning guide shafts 3001 and 3002 of the air control connecting plate assembly 3000 into the corresponding guide 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 battery) into place from the loop housing 1100.

[0082] 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 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 in a split module before the loop housing 1100 is closed.

[0083] Another feature of this application is described below, which relates to the water collection cup mentioned in this application. As Figure 4 shown, the water collection cup 1005 is connected to the water collection cup joint 1612 of the exhalation probe base assembly 1600a. In the prior art, the water collection cup that achieves basically the same function is usually arranged at the Figure 2 and Figure 3 shown coiled tube assembly 2000. When changing the position of the water collection cup from the coiled tube assembly 2000 to the water collection cup joint 1612 of this application, or adding a water collection cup at the water collection cup joint 1612, the inventors of this application surprisingly found that this actually helps to calibrate the exhalation and inhalation flow probes in the breathing circuit structure.

[0084] It should be understood that when calibrating the flow probe in the breathing circuit, the flow probe needs to be maintained 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.

[0085] 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.

[0086] 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.

[0087] 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 a fluid connection 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 a fluid connection 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 connected to the external atmosphere. It can be understood that in this way, a flow path is formed, which sequentially passes through the fresh gas branch 99, 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 in 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.

[0088] 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 breathing bag connector (such as Figure 3 the manual breathing bag connector 1003) in the state of not connecting the manual breathing 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.

[0089] 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 breathing circuit structure for an anesthesia machine, comprising: An expiratory flow probe located on the expiratory flow path is used to detect the patient's expiratory flow; and an exhalation one-way valve located in the exhalation flow path and downstream of the exhalation flow sensor; The breathing circuit structure further comprises a water collection cup branch branched off from the exhalation flow path between the exhalation flow probe and the exhalation one-way valve, and a water collection cup is detachably connected to the end of the water collection cup branch for collecting liquid water formed by condensation of water vapor contained in the patient's exhalation; Wherein, when the water collection cup is connected to the water collection cup branch, the water collection cup closes the water collection cup branch; when the water collection cup and the water collection cup branch are separated, the water collection cup branch leads to the atmosphere.

2. The breathing circuit structure according to claim 1, characterized in that: It also includes an exhalation probe base assembly, the exhalation flow probe can be detachably inserted into the exhalation probe base assembly, the exhalation probe base assembly has an outwardly extending water cup joint, and the water cup joint is in fluid communication with the air flow channel in the exhalation probe base assembly; The water collection cup joint forms the water collection cup branch, and the water collection cup is detachably connected to the water collection cup joint.

3. The breathing circuit structure according to claim 1, characterized in that: It also includes a circuit housing, in which the exhalation probe base assembly and the exhalation flow probe are arranged, and the water cup connector passes through the circuit housing and extends to the outside of the circuit housing.

4. The breathing circuit structure according to claim 3, characterized in that: A plurality of modules are arranged in the circuit housing, each module providing a part of the breathing circuit; wherein the plurality of modules are separable from each other; and any two modules that are interconnected and fluidically connected are connected by port sealing docking without using any fasteners.

5. The breathing circuit structure according to any one of claims 1 to 4, characterized in that: Also includes: An exhalation connector, used to install an exhalation tube leading to the patient; The exhalation flow probe is in fluid communication with the exhalation connector; An inspiratory flow probe located on the inspiratory airway is used to detect the patient's inspiratory flow; An inhalation connector, used for installing an inhalation tube leading to a patient; the inhalation flow probe is in fluid communication with the inhalation connector; an inspiratory one-way valve located in the inspiratory flow path and upstream of the expiratory flow sensor; A fresh gas branch enters the inhalation flow path upstream of the inhalation one-way valve.

6. An anesthesia machine, comprising the breathing circuit structure according to any one of claims 1 to 5.

7. A method for calibrating a flow sensor in a breathing circuit structure according to claim 5, for calibrating the inspiratory flow sensor and the expiratory flow sensor, the method comprising: Connecting a connecting tube between the exhalation connector and the inhalation connector to establish fluid communication between the exhalation connector and the inhalation connector; Keeping the water collection cup branch and the water collection cup in a separated state, so that the water collection cup branch is connected to the external atmosphere; The working gas is injected through the fresh gas branch, and the working gas sequentially passes through the inhalation check valve, the inhalation flow sensor, the inhalation connector, the connecting pipe, the exhalation connector, the exhalation flow sensor, and finally flows out from the water cup branch; The flow rate of the working gas flowing out of the water cup branch and the output results of the inspiratory flow probe and the expiratory flow probe corresponding to the flow rate are detected, so as to calibrate the inspiratory flow probe and the expiratory flow probe.

8. The method according to claim 7, characterized in that The breathing circuit structure also includes: A manual machine-controlled valve capable of switching between a manual state and a machine-controlled state; and Manual bladder connector, used to connect the manual bladder; The method further comprises: Switching the manual machine-controlled valve to the manual state; and The manual bellows joint is blocked when the manual bellows is not connected.

9. The method according to claim 8, characterized in that The breathing circuit structure further includes an APL valve for controlling the maximum air pressure of the input gas of the manual bag; The method further includes increasing a pressure threshold of the APL valve so that the pressure threshold is higher than a maximum value of a normal working pressure range of the working gas.

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