Split type breathing circuit structure and oxygen concentration sensor mounting structure of anesthesia machine

Abstract

The invention relates to an oxygen concentration sensor mounting structure for an anaesthesia machine. The oxygen concentration sensor mounting structure is used for measuring oxygen concentration in inspiration of a patient. The mounting structure includes: a chamber; the push rod is provided with a rod part and a plugging part; the mounting seat is arranged on the first side wall of the cavity, is provided with a long guide hole and is used for receiving and guiding the rod part of the push rod to reciprocate; the sensor interface is arranged at the second side wall of the chamber and comprises a mounting through hole facing the first end part, the second end part and used for receiving an oxygen concentration sensor; and a biasing spring for applying a biasing force toward the sensor interface to the push rod. And under the condition that the oxygen concentration sensor is not installed, the push rod is pushed to the sensor interface by the bias force of the bias spring, so that the plugging part of the push rod is propped against the first end part of the sensor interface to close the installation through hole. Under the condition that the oxygen concentration sensor is mounted, the detection end part of the oxygen concentration sensor extends into the cavity through the mounting through hole, and the plugging part of the push rod is pushed to the first end part of the sensor interface.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and more specifically, to a split breathing circuit structure for an anesthesia machine and an oxygen concentration sensor mounting structure. Background Art

[0002] An anesthesia machine is a specially designed medical device for providing precise anesthesia doses to patients during surgeries 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 this circuit and obtains the required gases such as anesthesia gases from this circuit during inhalation. On the other hand, the breathing circuit is connected to the gas delivery system of the anesthesia machine, receives fresh gases, driving gases, etc. from the gas delivery system, and discharges the waste gases from this 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 anesthesia gas from the driving gas, a manual / automatic control valve for switching the breathing circuit between the manual and machine-controlled states, and so on. To monitor the gases in the breathing circuit, the breathing circuit usually also includes functional components such as a flow probe, an oxygen concentration sensor, etc.

[0004] In the prior art, the gas path part in this breathing circuit is usually formed as an integrally molded integrated block. Such an integrated block forms airways inside it 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, airways are usually formed inside a whole piece of metal by drilling. For a plastic integrated block, it usually includes two plastic parts, an upper shell and a lower shell, each plastic part is respectively injection molded by a mold, and after these two plastic parts are spliced facing each other, the required airways are defined inside the formed integrated block.

[0005] The inventors of the present application found that for the aforementioned integrated block type gas path structure, on the one hand, the formed airways are restricted by the processing technology and have problems such as right-angle bends, complex airways, 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 will also be 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 this 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 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 an oxygen concentration sensor mounting structure for an anesthesia machine, which is used to mount an oxygen concentration sensor to measure the oxygen concentration in the patient's inhalation. The oxygen concentration sensor mounting structure includes: a chamber having a first side wall and a second side wall facing each other in a second direction; a push rod disposed in the chamber, the push rod having a rod portion and a blocking portion formed at the rod portion; a mounting seat disposed at the first side wall, the mounting seat having an elongated guiding hole extending in the second direction for receiving and guiding the rod portion of the push rod to reciprocate in the second direction; a sensor interface disposed at the second side wall, the sensor interface including a first end facing the first side wall, a second end opposite to the first end, and a mounting through hole for receiving the oxygen concentration sensor; and a biasing spring for applying a biasing force to the push rod toward the sensor interface; wherein, in the case where the oxygen concentration sensor is not installed, the biasing force of the biasing spring pushes the push rod toward the sensor interface, so that the blocking portion of the push rod abuts against the first end of the sensor interface to close the mounting through hole; and in the case where the oxygen concentration sensor is installed, the detection end of the oxygen concentration sensor extends into the chamber through the mounting through hole, pushing the blocking portion of the push rod away from the first end of the sensor interface.

[0009] Optionally, the blocking portion includes an enlarging portion with a larger transverse dimension from the rod portion, the biasing spring is a helical spring surrounding the push rod, and the helical spring is restricted in a compressed state between the mounting seat and the enlarging portion.

[0010] Optionally, the size of the enlarging portion is suitable for abutting against the first end of the sensor interface in the case where the oxygen concentration sensor is not installed.

[0011] Optionally, the blocking portion further includes a seal ring bearing portion and a first seal ring disposed around the outer peripheral wall of the seal ring bearing portion, and the size of the seal ring bearing portion is suitable for extending into the mounting through hole of the sensor interface, so that the first seal ring is between the inner peripheral wall of the mounting through hole and the outer peripheral wall of the seal ring bearing portion and seals.

[0012] Optionally, the mounting seat includes: a cylinder body that defines the guiding hole therein; and a groove extending circumferentially outside the cylinder body; wherein, the end of the helical spring facing the mounting seat is held in the groove.

[0013] Optionally, the mounting seat is integrally formed with the first side wall of the chamber.

[0014] Optionally, the second side wall of the chamber is detachable.

[0015] According to another aspect of the present application, an oxygen concentration detection structure for an anesthesia machine is provided, including the aforementioned oxygen concentration sensor mounting structure and an oxygen concentration sensor detachably mounted to the oxygen concentration sensor mounting structure; wherein, the second end of the sensor interface of the oxygen concentration sensor mounting structure extends to the outside of the second side wall, and an internal thread is formed at the second end; the oxygen concentration sensor is formed with an external thread that mates with the internal thread on its outer peripheral wall and is provided with a second sealing ring; wherein, when the oxygen concentration sensor is screwed into the mounting through hole of the sensor interface such that the internal thread of the sensor interface forms a threaded connection with the external thread of the oxygen concentration sensor, the second sealing ring is located between the inner peripheral wall of the mounting through hole and the outer peripheral wall of the oxygen concentration sensor and seals.

[0016] According to yet another aspect of the present application, a split-type breathing circuit structure for an anesthesia machine is provided, including a circuit assembly, the circuit assembly including a circuit main body, the circuit main body including a circuit housing and a plurality of integrated modules arranged inside the circuit housing, each of the plurality of integrated modules being integral in itself but separable between the integrated modules, each integrated module forming at least a part of at least one of the plurality of functional components required for the breathing circuit of the anesthesia machine; the plurality of integrated modules at least includes a second integrated module, the second integrated module at least forming a valve seat of an inhalation one-way valve, a chamber for placing an oxygen concentration sensor, and a connection port for connecting to a first opening of a carbon dioxide absorption tube; the flap and flap cover required for the inhalation one-way valve are adapted to be placed from the outside of the circuit housing and detachably connected to the valve seat of the inhalation one-way valve; the split-type breathing circuit structure further includes the aforementioned oxygen concentration sensor mounting structure, wherein, the chamber of the oxygen concentration sensor mounting structure is formed by the second integrated module.

[0017] According to still another aspect of the present application, an anesthesia machine is provided, including the aforementioned split-type breathing circuit structure. Description of the Drawings

[0018] Figure 1is the schematic diagram of the breathing circuit for an anesthesia machine according to the present application;

[0019] Figure 2 is an embodiment of the breathing circuit structure for an anesthesia machine according to the present application;

[0020] Figure 3 is Figure 2 the assembly explosion diagram of the shown breathing circuit structure;

[0021] Figure 4 is Figure 3 the assembly explosion diagram of the circuit components in the shown breathing circuit structure;

[0022] Figure 5 is Figure 4 the assembly explosion diagram of assembly B in the shown circuit components;

[0023] Figure 6 is Figure 5 the sectional view of the inspiratory phase components in ;

[0024] Figure 7 is Figure 5 the assembly explosion diagram of the inspiratory phase components in ;

[0025] Figure 8 is Figure 5 the partial sectional view of the inspiratory chamber of the inspiratory phase components in and the sensor mounting structure it has;

[0026] Figure 9 is Figure 8 the partial sectional view after installing the oxygen concentration sensor on the basis of ;

[0027] Figure 10 is Figure 5 the sectional view of the manual machine control valve assembly in, shown in the machine control state; and

[0028] Figure 11 is Figure 4 the sectional view of the expiratory valve assembly in. Detailed implementation manners

[0029] The technical solutions of the present application will be described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0030] 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 to control 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 working of the driving gas and other related components and gas paths, the expiratory circuit can achieve 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.

[0031] 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 the current need, 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-carrying 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 during 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).

[0032] During the inhalation cycle of patient 42 in the machine-controlled working mode, the exhalation valve 32 is in the closed state. The third drive gas 63 enters the coil 34, pushes the recycled gas stored in the coil 34 out of the coil 34, and then enters the carbon dioxide absorber 37 through the manual machine control 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 inside the absorber 37 to reduce the carbon dioxide content in the anesthetic gas. After leaving the absorber 37, the processed anesthetic gas enters the body of patient 42 (such as the lungs) after passing through the inhalation check valve 38 and the inhalation flow probe 41. Among them, the flow path of the inhalation of patient 42 between the manual machine control valve 35 and patient 42 can be called the inhalation flow path, and the carbon dioxide absorber 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 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.

[0033] Continue to combine below Figure 1 to describe the manual working mode of the breathing circuit. First, it is necessary to cut off the power supply of the inhalation valve 28 and the solenoid valve 27 to cut off the supply of the drive gas, thereby cutting off the supply of the first to third drive gases 61-63. This will cause the manual machine control valve 35 to switch from the current machine-controlled state to the manual state and the exhalation valve 32 to be in the open state. 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 absorber 37 through the manual machine control valve 35. The gas in the absorber 37 leaves the absorber 37 after being processed by the carbon dioxide absorbent inside, and then enters the body of patient 42 together with the fresh gas mixed with the anesthetic 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.

[0034] During the exhalation cycle in the manual operation state, the states of the aforementioned inhalation valve 28, solenoid valve 27, manual machine 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 machine 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 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.

[0035] It should be noted that, in Figure 1 the 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. In the state where the water trap 65 is connected to the water trap branch 99, the water trap 65 can close the water trap branch 99; in the state where the water trap 65 is separated 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.

[0036] Figure 1 The inhalation valve 28, IP valve 30, solenoid valve 27, air resistance 29, safety valve 31, and filter 6 are also shown. These components are mainly used for on-off control, pressure control, and filtration of the driving gas, etc. 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.

[0037] Figure 2 The shown breathing circuit structure can be used to implement Figure 1 the part surrounded by the dashed box A in the shown breathing circuit. As Figure 2 shown, this breathing circuit structure generally can 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 Figure 1 the coil 34 in Figure 1 and the carbon dioxide absorption canister 4000 can basically correspond to Figure 1 the absorption canister 37 in 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 joint 1001 and the inhalation joint 1002 can be formed in a bent shape and have a section extending downward or obliquely downward after being installed in place. Such joints are more convenient for the operator to manually install the breathing tube and the suction tube. In particular, for the exhalation joint 1001, compared with a straight-extending joint, in the case where water vapor in the patient's exhaled breath condenses into water here, such an exhalation joint 1001 can prevent the condensed water from flowing back to the circuit assembly 1000. The circuit assembly 1000 can also include a manual resuscitator joint 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 Figure 1 the interface between the fresh gas to enter the breathing circuit in

[0038] As shown in Figure 3-4 the exploded view of Figure 4 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 but not visible 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 the 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 not visible due to occlusion in Figure 3 and are 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-sealed docking with the corresponding gas ports of the circuit main body 1000a respectively in the assembled state. The term "port-sealed 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.

[0039] 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 may, in the assembled state, together with the connection block body 1016, define the waste discharge channel 1013 as shown in Figure 3 .

[0040] 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 airflow channel (not shown) therebetween. The two ends of the airflow channel respectively terminate at the gas ports 2001 and 2002. As described above in connection with Figure 1 the coil 34, the coil assembly 2000 may receive and discharge a driving gas (such as the third driving gas 63) and may simultaneously accommodate a reusable anesthetic gas (i.e., recycled gas). The driving gas and the recycled gas may 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 for the required flow of the third driving gas 63 and the recycled gas during the exhalation and inhalation cycles of the patient 42 in the machine-controlled operating mode described above. In addition, the coil assembly 2000 may have a connecting portion 2005 that extends 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).

[0041] The air control connection plate assembly 3000 may include positioning guide shafts 3001 and 3002, as well as 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 the corresponding receiving holes (not shown) of the circuit assembly 1000 and inserted until the hooks 3003 and 3004 are respectively snapped into the 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.

[0042] 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 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.

[0043] The circuit main body 1000a can be integrally formed into a flat block shape that is substantially rectangular parallelepiped. It may include a circuit housing 1100 and functional components mounted on and housed within the circuit housing 1100. Different from the prior art implementation using an integrated block, the functional components housed 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.

[0044] Figure 4 An exploded view of the circuit assembly 1000 is shown, in which the remaining part except the circuit connection block 1000b and the absorption tank 4000 belongs to Figure 3 the circuit main body 1000a shown in Figure 4 As shown in Figure 3 The circuit housing 1100 identified in Figure 5 itself may include a circuit lower housing 1101, a circuit baffle 1102, and a circuit upper cover 1103. The functional components accommodated in the circuit 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 circuit main 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 components) included in the assembly B. The exhalation valve assembly 1200 can basically correspond to the exhalation valve 32 shown in

[0045] See 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.

[0046] 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 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 cylinder 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. The inspiratory 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.

[0047] 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.

[0048] 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 circuit lower 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 circuit lower 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 joints 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.

[0049] 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

[0050] for detecting 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 of these two flow probe assemblies are different during operation, so the bending directions of the elastic diaphragms inside them are different. Therefore, in order to distinguish these 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. Figure 4 the water collecting cup 1005 shown in Figure 1 The water collecting cup 1005 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 removing 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.

[0051] 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 opposite side of 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 opposite side of 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

[0052] the fresh gas shown in Figure 4 and to house a sensor for measuring the oxygen concentration in the patient's inhalation. Figure 1 The inhalation phase assembly 1400 includes an inhalation one-way valve seat 1401 that extends substantially cylindrically in the vertical (Z-axis direction).

[0053] In Figure 5As can be seen, the inspiratory phase component 1400 further includes a fresh gas pipeline 1404. The fresh gas containing anesthetic from a fresh gas source can enter the inspiratory one-way valve via the fresh gas pipeline 1404. The fresh gas pipeline 1404 can extend from the inspiratory 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 know. Although in Figure 3 and Figure 4 the fresh gas pipeline 1404 is not visible due to being blocked or covered.

[0054] Figure 6 Figure Figure 5 shows a cross-sectional view of the inspiratory phase component 1400 of Figure 6 taken along the central axis C of the inspiratory one-way valve and in the Y-Z plane, and additionally shows the assembled inspiratory flap 1006 and inspiratory flap cover 1007. As Figure 6 shows, the inspiratory 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 forms a fluid communication with the intake channel 1405. The first tank connection port 1406 opens in the Z-axis direction to facilitate port-sealed 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 inspiratory 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 inspiratory 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 inhalation to flow from the intake channel 1405 to the outlet channel 1407, and not allow the 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 communicates with the intake channel 1405 of the inspiratory 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 The opening 1410 can be used as a paramagnetic oxygen sampling port, and the opening 1411 can be used as an airway pressure sampling port.

[0055] The inspiratory chamber 1402 can form a fluid communication with the outlet channel 1407 of the inspiratory one-way valve seat 1401. In this way, the patient's inhalation will enter the inspiratory 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.

[0056] 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 guiding hole 1413 therein. The guiding hole 1413 may be formed as a blind hole with a closed outer end. The extending direction of the guiding hole 1413 is substantially along the Figure 5 Y-axis direction (i.e., the second direction) shown in. A push rod 1416 is disposed 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 guiding hole 1413. The guiding 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 guiding 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.

[0057] 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 occupancy of the internal volume of the chamber.

[0058] 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 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 ).

[0059] A 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.

[0060] 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 around 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.

[0061] The blocking portion 1418 of the push rod 1416 may further include a sealing ring bearing portion 1426 and a first sealing ring 1427, and the first sealing ring 1427 can be arranged in a groove (not labeled) around the outer peripheral wall of the sealing ring bearing portion 1426. As Figure 8 shown, the size of the sealing ring bearing portion 1426 is suitable for extending into the installation through hole 1421 of the sensor interface 1420, so that the first sealing ring 1427 is located between the inner peripheral wall of the installation through hole 1421 and the outer peripheral wall of the sealing ring bearing portion 1426 and plays a sealing role between the two.

[0062] Referring 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 sealing ring 1008b on its outer peripheral wall. In the case where the oxygen concentration sensor 1008 is installed in place, the second sealing 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.

[0063] In addition, internal threads (clearly visible in the figure but not labeled) may be formed at the second end portion 1423 of the sensor interface 1420, and external threads that mate with 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 screwed-in manner, and a firm connection between the oxygen concentration sensor 1008 and the sensor interface 1420 can be achieved.

[0064] Return Figure 7 , the second side wall 1419 of the inhalation chamber 1402 may be detachable, the sensor interface 1420 may be integrally formed with the second side wall 1419, and is hermetically connected to the inhalation chamber 1402 by means of fasteners 1429 and a sealing ring 1430.

[0065] Reference is made below to Figure 4 、 Figure 5 and Figure 10 to illustrate the manual control valve assembly 1800, which is functionally basically corresponding to the manual control valve 35 in Figure 1 . The manual control valve assembly 1800 as a whole may extend along the X-axis direction, with one end located at the housing baffle 1102 of the circuit housing 1100, and the other opposite end may form a port seal docking 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 inhalation 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 seal docking 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 the first-way driving gas 61 in Figure 1 ) 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 along the Y-axis direction, and the inhalation outlet interface 1807 is formed at the bottom of the manual control valve assembly 180 and opens downward along the Z-axis direction. Inside the manual control valve assembly 1800, the exhalation inlet pipe 1806 and the inhalation outlet interface 1807 are in communication with the mechanically controlled ventilation passage 1805 via an internal passage 1810.

[0066] 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 in 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.

[0067] 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.

[0068] 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.

[0069] 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, 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 flap cover 1010 is screwed into the opening of the upper cover 1103 of the loop so that its lower end is in sealing 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 flap 1009, and the expiratory flap cover 1010 together form an expiratory one-way valve, which functionally corresponds to the expiratory one-way valve 39 in

[0070] The expiratory phase component 1300 also may be integrated with a connecting pipe 1304. One end of the connecting pipe 1304 is in sealing butt joint with the pipe 1012 of the loop connection block 1000b (see Figure 3 and Figure 4 ), and the other end is in sealing butt joint with the mechanical control ventilation channel 1805 of the manual mechanical control valve assembly 1800, so as to form a fluid connection between the coil assembly 2000 and the manual mechanical 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 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. This facilitates sealing 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 mechanical control valve assembly 1800 respectively by a single insertion operation during assembly, and enhances the connection stability between the expiratory phase component 1300 as a whole and adjacent components.

[0071] As shown in Figure 5As shown, the manual bellows assembly 1700 may include a substantially cylindrical APL valve seat 1701 extending along the vertical (Z-axis direction). Figure 4 The APL valve 1017 in Figure 1 may be mounted to the valve seat 1701 through an opening in the loop upper cover 1103. Functionally, the APL valve 1017 may 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 connector 1003 shown in Figure 3 and Figure 4 can pass through the bellows interface hole 1106 of the loop lower housing 1101 and be sealingly 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 sealingly 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 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 the AGSS shown in

[0072] The following describes the expiratory valve assembly 1200 shown in Figure 4 . The expiratory valve assembly 1200 has no direct gas communication with other components 1300 - 1800 within the loop housing 1100. As shown in Figure 11 , the expiratory valve assembly 1200 may include an expiratory valve 1205, which may be a pneumatic valve driven by gas. The expiratory valve assembly 1200 may 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 expiratory valve 1205. As seen more clearly in Figure 4 , the expiratory valve 1205 may extend integrally along the Z-axis direction, and the driving gas vent pipe 1202 and the waste discharge pipe 1203 extend substantially along the Y-axis direction towards the left side of the loop lower housing 1101. Refer to Figure 3 and Figure 4, the drive gas vent pipe 1202 can penetrate through the lower circuit housing 1101 along the Y-axis direction and form a port-sealed butt joint with the pipe 1011 of the circuit connection block 1000b, and the waste discharge pipe 1203 can penetrate through the lower circuit housing 1101 along the Y-axis direction and form a fluid connection with the waste discharge channel 1013 in the circuit 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 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.

[0073] 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 prompt 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 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 vent pipe 1202, and then is conveyed 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 through 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 through 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.

[0074] 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, from the paramagnetic oxygen sampling port, the sampling 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.

[0075] Based on the foregoing description and referring 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 port-sealed docking manner without using any fasteners. Moreover, these modules can all be integral modules. The term "integral module" used here 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.

[0076] 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 no fasteners are used for the connection between the various modules for forming the breathing circuit within the circuit housing 1100 of the circuit body 1000a as mentioned above. Then, the opening 1403 of the inhalation phase assembly 1400 and the channel 1508 of the suction probe base assembly 1500a are hermetically docked at 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-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 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-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 body 1000a are completed.

[0077] As can be seen from the foregoing assembly process, these modules are separable from each other, thus realizing 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 in the circuit main body in the prior art can be built into the circuit main body to achieve a greater degree of integration. The split structure also enables the functional components required in the breathing circuit to be scattered 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.

[0078] 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, 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 the 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.

[0079] 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 check valve seat 1301 and the connecting pipe 1304 of the exhalation phase assembly 1300 may be divided into two modules.

[0080] 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 bag assembly 1700, and the manual mechanical control valve assembly 1800 shown in

[0081] 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 inserted into 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, and the other end of each of the four sampling tubes 1901 is respectively inserted into four sampling tube interfaces 1811 of the manual pneumatic 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 loop housing 1100, such accessories are not included within the scope of the "module" concept of 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, 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 removal of the connectors without using tools and directly removing the exhalation flow probe assembly 1600b or the inhalation flow probe assembly 1500b from the exhalation and inhalation interface holes 1107 and 1105 to facilitate the replacement of the diaphragm in the flow probe assembly.

[0082] 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 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 manner. After that, the APL valve 1017 is installed through the corresponding opening of the loop 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 trap 1005 are installed at the bottom of the loop lower housing 1101. Finally, refer to Figure 3, extend the connecting 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 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 cell) into place from the loop housing 1100.

[0083] It should be noted that the various functional components installed from the outside of the loop housing 1100 described above, such as the inhalation valve 1006 and the exhalation valve 1009, although they may be or partially in the loop housing 1100, are not included in the concept of "module" arranged in the loop housing 1100 as 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 bag assembly 1700, and the manual mechanical control valve assembly 1800 arranged in 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 is only for these functional components that need to be arranged in the loop housing 1100 before the loop housing 1100 is closed to be constructed as split modules.

[0084] 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 coil assembly 2000 shown in Figure 2 and Figure 3 shown. When the position of the water collecting cup is changed from the coil assembly 2000 to the water collecting cup joint 1612 of this application, or a new water collecting cup is added 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.

[0085] 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 exhalation connector 1001 and the inhalation connector 1002, etc. In addition, each calibration work can only be performed on one of the exhalation flow probe and the inhalation flow probe.

[0086] 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 exhalation flow probe and the inhalation flow probe simultaneously.

[0087] 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 inhalation flow probe 41 and the exhalation flow probe 40.

[0088] Referring to Figure 3 , a connecting pipe (not shown, such as a corrugated pipe) can be connected between the exhalation connector 1002 and the inhalation connector 1001 to form a fluid connection between the exhalation connector 1002 and the inhalation connector 1001. The connecting pipe is schematically represented by the dashed 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 inhalation flow probe 41 and the upstream of the exhalation flow probe 40 with the connecting pipe 97. Referring to Figure 1 , the condensate cup 65 can be removed 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 such a flow path is formed, from the fresh gas branch 99 sequentially through the inhalation check valve 38, the inhalation flow probe 41, the inhalation connector 1001 ( Figure 3 ), the connecting pipe 97, the exhalation 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.

[0089] 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.

[0090] 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. An oxygen concentration sensor mounting structure for an anesthesia machine, used to mount an oxygen concentration sensor to measure the oxygen concentration in the patient's inhaled air; The oxygen concentration sensor mounting structure comprises: a chamber having a first side wall and a second side wall facing each other along a second direction; a push rod arranged in the chamber, the push rod comprising a rod portion and a blocking portion formed at the rod portion; a mounting seat arranged at the first side wall, the mounting seat having an elongated guide hole extending along the second direction, for receiving and guiding the rod portion of the push rod to reciprocate along the second direction; a sensor interface disposed at the second side wall, the sensor interface comprising a first end facing the first side wall, a second end opposite to the first end, and a mounting through hole for receiving the oxygen concentration sensor; and a bias spring for applying a biasing force to the push rod toward the sensor interface; Wherein, when the oxygen concentration sensor is not installed, the biasing force of the biasing spring pushes the push rod toward the sensor interface, so that the blocking portion of the push rod abuts against the first end portion of the sensor interface to close the installation through hole; and When the oxygen concentration sensor is installed, the detection end of the oxygen concentration sensor extends into the chamber through the installation through hole, pushing the blocking portion of the push rod away from the first end of the sensor interface.

2. The sensor mounting structure according to claim 1, characterized in that: The blocking portion includes an enlarged portion that is enlarged in lateral dimension from the rod portion, and the biasing spring is a coil spring surrounding the push rod, and the coil spring is confined between the mounting seat and the enlarged portion in a compressed state.

3. The sensor mounting structure according to claim 2, characterized in that: The enlarged portion is sized to abut against the first end of the sensor interface when the oxygen concentration sensor is not installed.

4. The sensor installation structure according to any one of claims 2 to 3, characterized in that: The sealing portion also includes a sealing ring bearing portion and a first sealing ring arranged around the outer peripheral wall of the sealing ring bearing portion. The size of the sealing ring bearing portion is suitable for extending into the mounting hole of the sensor interface, so that the first sealing ring is located between the inner peripheral wall of the mounting hole and the outer peripheral wall of the sealing ring bearing portion to perform sealing.

5. The sensor installation structure according to any one of claims 2 to 4, characterized in that: The mounting seat comprises: a cylinder, the cylinder defining the guide hole therein; and a groove extending circumferentially on the outside of the cylinder; The end of the coil spring facing the mounting seat is held in the groove.

6. The sensor installation structure according to any one of claims 1 to 5, characterized in that: The mounting seat is integrally formed with the first side wall of the chamber.

7. The sensor installation structure according to any one of claims 1 to 6, characterized in that: The second side wall of the chamber is removable.

8. An oxygen concentration detection structure for an anesthesia machine, comprising an oxygen concentration sensor mounting structure according to any one of claims 1 to 7 and an oxygen concentration sensor detachably mounted to the oxygen concentration sensor mounting structure; in, The second end of the sensor interface of the oxygen concentration sensor mounting structure extends to the outside of the second side wall, and an internal thread is formed at the second end; the oxygen concentration sensor is formed with an external thread matching the internal thread and a second sealing ring on its outer peripheral wall; Wherein, when the oxygen concentration sensor is screwed into the mounting through hole of the sensor interface so that the internal thread of the sensor interface and the external thread of the oxygen concentration sensor form a threaded connection, the second sealing ring is located between the inner circumferential wall of the mounting through hole and the outer circumferential wall of the oxygen concentration sensor and performs sealing.

9. A split breathing circuit structure for an anesthesia machine, comprising a circuit assembly, the circuit assembly comprising a circuit body, the circuit body comprising a circuit housing and a plurality of integrated modules arranged inside the circuit housing, each of the plurality of integrated modules being integral in itself but being separable from each other, each integrated module forming at least a portion of at least one functional component among a plurality of functional components required for the breathing circuit of the anesthesia machine; the plurality of integrated modules comprising at least a second integrated module, the second integrated module forming at least a valve seat of an inhalation check valve, a chamber for placing an oxygen concentration sensor and a connection port for connecting to a first opening of a carbon dioxide absorption tube; the flap and flap cover required for the inhalation check valve being suitable for being placed from the outside of the circuit housing and being detachably connected to the valve seat of the inhalation check valve; The split breathing circuit structure further comprises an oxygen concentration sensor mounting structure as claimed in any one of claims 1 to 7, wherein: The chamber of the oxygen concentration sensor mounting structure is formed by the second integrated module.

10. An anesthesia machine, comprising the split breathing circuit structure according to claim 9.

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