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

Abstract

The present application relates to an oxygen concentration sensor mounting structure for an anesthesia machine for measuring oxygen concentration in patient inspiration. The mounting structure comprises: a chamber; a push rod inside the chamber having a rod portion and a blocking portion; a mounting seat at a first side wall of the chamber having an elongated guide hole for receiving and guiding reciprocating movement of the rod portion of the push rod; a sensor interface arranged at a second side wall of the chamber comprising a first end portion, a second end portion, and a mounting through hole for receiving an oxygen concentration sensor; and a biasing spring for applying a biasing force to the push rod towards the sensor interface. In the absence of the oxygen concentration sensor, the biasing force of the biasing spring pushes the push rod towards the sensor interface such that the blocking portion of the push rod abuts against the first end portion of the sensor interface to close the mounting through hole. In the presence of the oxygen concentration sensor, a probe end portion of the oxygen concentration sensor extends into the chamber via the mounting through hole, pushing the blocking portion of the push rod away from the first end portion of the sensor interface.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical apparatuses, and more particularly to a split type breathing circuit structure for an anesthesia machine and an oxygen concentration sensor mounting structure. BACKGROUND

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

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

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

[0005] The inventors of the present application found that for the foregoing integrated block type gas path structure, on one hand, the formed gas channels will have problems such as right-angle bends, complex gas channels, excessive gas resistance, complex sealing structure and poor sealing effect due to the limitation of the processing technology; 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 position, and the overall disinfection of the integrated block will also have the problem of poor disinfection effect; thirdly, due to the limitation of the one-piece molding process, part of the functional components in the breathing circuit cannot be implemented in the integrated block, and need to be additionally connected outside the integrated block, which makes the overall 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 the problem of complicated steps when calibrating the flow probe therein. SUMMARY

[0007] The present application aims 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, for mounting an oxygen concentration sensor to measure the oxygen concentration in patient inspiration. 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 having 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 arranged at the second side wall, the sensor interface comprising a first end portion facing the first side wall, a second end portion opposite to the first end portion, and a mounting through hole for receiving the oxygen concentration sensor; and a biasing spring for applying a biasing force to the push rod towards the sensor interface; wherein, in the absence of the oxygen concentration sensor being mounted, the biasing force of the biasing spring pushes the push rod towards 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 mounting through hole; and in the presence of the oxygen concentration sensor being mounted, a probe end portion of the oxygen concentration sensor extends into the chamber via the mounting through hole, pushing the blocking portion of the push rod away from the first end portion of the sensor interface.

[0009] Optionally, the blocking portion comprises an enlarged portion increasing in transverse dimension from the rod portion, and the biasing spring is a coil spring surrounding the push rod, the coil spring being constrained in a compressed state between the mounting seat and the enlarged portion.

[0010] Optionally, the enlarged portion is sized to abut against the first end portion of the sensor interface in the absence of the oxygen concentration sensor being mounted.

[0011] Optionally, the blocking portion further comprises a seal ring carrier portion and a first seal ring arranged around an outer peripheral wall of the seal ring carrier portion, the seal ring carrier portion being sized to extend into the mounting through hole of the sensor interface, so that the first seal ring is between an inner peripheral wall of the mounting through hole and an outer peripheral wall of the seal ring carrier portion and seals.

[0012] Optionally, the mounting seat comprises a cylinder body defining the guide hole therein, and a groove extending circumferentially on the outside of the cylinder body; wherein the end of the coil 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, there is provided an oxygen concentration detection structure for an anesthesia machine, comprising 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 portion 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 portion; the oxygen concentration sensor is formed with an external thread cooperating with the internal thread and a second sealing ring is arranged on the peripheral wall thereof; 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 between the inner peripheral wall of the mounting through hole and the peripheral wall of the oxygen concentration sensor and seals.

[0016] According to still another aspect of the present application, there is provided a split breathing circuit structure for an anesthesia machine, comprising a circuit assembly comprising a circuit main body comprising a circuit housing and a plurality of integrated modules arranged inside the circuit housing, each of the integrated modules is integral by itself but detachable between the integrated modules, and each integrated module forms at least a part of at least one functional component of a plurality of functional components required by the breathing circuit of the anesthesia machine; the plurality of integrated modules at least comprises a second integrated module forming at least a valve seat of an inspiratory check valve, a chamber for placing an oxygen concentration sensor, and a connection port for connecting with a first opening of a carbon dioxide absorption tube; a valve disc and a valve disc cover required by the inspiratory check valve are adapted to be placed from the outside of the circuit housing and detachably connected to the valve seat of the inspiratory check valve; the split breathing circuit structure further comprises 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, there is provided an anesthesia machine comprising the aforementioned split breathing circuit structure. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0020] Figure 3 is Figure 2 an assembly exploded view of the breathing circuit configuration shown in

[0021] Figure 4 is Figure 3 an assembly exploded view of the circuit components in the breathing circuit configuration shown in

[0022] Figure 5 is Figure 4 an assembly exploded view of assembly B in the circuit components shown in

[0023] Figure 6 is Figure 5 a cross-sectional view of the inspiratory phase components in

[0024] Figure 7 is Figure 5 an assembly exploded view of the inspiratory phase components shown in

[0025] Figure 8 is Figure 5 a partial cross-sectional view of the inspiratory chamber of the inspiratory phase components shown in

[0026] Figure 9 is Figure 8 a partial cross-sectional view after installation of an oxygen concentration sensor on the basis of

[0027] Figure 10 is Figure 5 a cross-sectional view of the manual motor-controlled valve assembly shown in

[0028] Figure 11 is Figure 4 a cross-sectional view of the expiratory valve assembly shown in DETAILED DESCRIPTION

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

[0030] As Figure 1As shown, the breathing circuit can include a manual-motorized valve 35 that can be switched between a manual state and a motorized state, such that the entire breathing circuit can be switched between a manual mode of operation and a motorized mode of operation. The driving gas entering the breathing circuit can be generally divided into three paths. A first path of driving gas 61 leads to the manual-motorized valve 35 for controlling the switching of the manual-motorized valve 35 between the manual state and the motorized state. A second path of driving gas 62 can lead to the exhalation valve 32 for controlling the opening and closing of the exhalation valve 32. A third path of driving gas 63 can lead to the coil 34 for pushing the existing gas in the coil 34. By controlling the driving gas and other related elements and gas paths, the breathing circuit can achieve the inspiration cycle and the expiration cycle of the patient 42 in the manual mode of operation and the motorized mode of operation, respectively. Meanwhile, in the inspiration cycle of the patient 42, the gas inhaled by the patient 42 contains the anesthetic that is applied in a controlled manner (such gas containing anesthetic can be referred to as anesthetic gas) to achieve the desired anesthetic effect.

[0031] Figure 1 The manual-motorized valve 35 shown in FIG. 1 is currently in the motorized state, and thus, the breathing circuit is correspondingly in the motorized mode of operation. In the expiration cycle of the patient 42, the exhalation valve 32 is in the open state. In this way, the gas (typically containing anesthetic) exhaled by the patient 42 sequentially passes through the exhalation flow probe 40, the exhalation check valve 39, the manual-motorized valve 35, and then enters the coil 34. The flow path between the patient 42 and the manual-motorized valve 35 in which the patient's 42 exhalation gas flows can be referred to as the exhalation flow path, and the exhalation flow probe 40 and the exhalation check valve 39 are located on the exhalation flow path, with the exhalation check valve 39 being located downstream of the exhalation flow probe 40. The exhalation gas entering the coil 34 can push the driving gas from the previous inspiration cycle that entered the coil 34 to exit the breathing circuit through the exhalation valve 32 and enter the anesthetic gas scavenging system (AGSS) for subsequent processing. In the expiration cycle, a certain amount of fresh gas (anesthetic gas newly entering the breathing circuit) can enter the breathing circuit from the fresh gas branch 98 and enter the carbon dioxide absorber 37 according to a pre-arrangement or current needs, so as to be used in the subsequent inspiration cycle. Meanwhile, in the expiration cycle, most of the anesthetic-containing gas exhaled by the patient 42 enters the coil 34 and can be temporarily stored therein and reused in the subsequent inspiration cycle for re-inhalation by the patient 42. In the following, the anesthetic gas in the breathing circuit that is reused is also referred to as the recycled gas to distinguish from the anesthetic gas newly entering the breathing circuit (i.e., fresh gas).

[0032] In the inspiratory cycle of the patient 42 in the machine-controlled mode, the expiratory valve 32 is closed. The third driving gas 63 enters the coil 34, pushing the circulating gas stored in the coil 34 out of the coil 34 and into the carbon dioxide absorber canister 37 through the manually-controlled valve 35. In the carbon dioxide absorber canister 37, the circulating gas mixes with fresh gas entering the canister 37 (if any) in the expiratory cycle and is treated by the carbon dioxide absorbent in the canister 37 to reduce the carbon dioxide content in the anesthetic gas. The treated anesthetic gas leaves the canister 37, passes through the inspiratory check valve 38 and the inspiratory flow probe 41 and enters the patient 42 (e.g. the lungs). The flow path between the manually-controlled valve 35 and the patient 42 in the inspiratory cycle can be referred to as the inspiratory flow path, on which the carbon dioxide absorber canister 37, the inspiratory check valve 38 and the inspiratory flow probe 41 are arranged in sequence in the direction of gas flow. In this inspiratory cycle, fresh gas can also enter the breathing circuit and enter the patient 42 together with the anesthetic gas leaving the canister 37, according to pre-arrangement or current need. As shown in Fig. 1, the fresh gas branch 98 enters the inspiratory flow path from between the carbon dioxide absorber canister 37 and the inspiratory check valve 38, upstream of the inspiratory check valve 38 in the inspiratory flow path. Figure 1

[0033] The manual mode of the breathing circuit will be described below in conjunction with Figure 1 Fig. 2. In the manual mode, the inspiratory valve 28 and the solenoid valve 27 are first de-energized to cut off the supply of driving gas, and thus the supply of the first to third driving gases 61-63. This causes the manually-controlled valve 35 to switch from the current machine-controlled state to the manual state and the expiratory valve 32 to be in the open state. In the inspiratory cycle of the manual mode, the operator manually presses the manual bulb 45, causing the gas in the manual bulb 45 to leave the manual bulb 45 and enter the carbon dioxide absorber canister 37 through the manually-controlled valve 35. The gas in the canister 37 is treated by the carbon dioxide absorbent therein and leaves the canister 37, then enters the patient 42 together with fresh gas mixed with anesthetic. The APL valve 33 is used to control the maximum gas pressure of the input gas of the manual bulb 45, i.e. when the gas pressure generated by pressing the manual bulb 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 the generation of an undesirably high gas pressure in the breathing circuit.

[0034] ​In the expiratory cycle of the manual mode, the states of the aforementioned inspiratory valve 28, solenoid valve 27, manual motor-controlled valve 35 and expiratory valve 32 remain the same as in the inspiratory cycle described above, and the operator manually releases the manual bladder 45. The gas (usually containing anesthetic) exhaled by the patient 42 sequentially passes through the expiratory flow probe 40, expiratory check valve 39, manual motor-controlled valve 35 and enters the manual bladder 45, causing the manual bladder 45 to swell. In this expiratory 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 bladder 45 in the subsequent inspiratory cycle.

[0035] It is noted that in the breathing circuit shown in Figure 1 the expiratory flow path between the expiratory flow probe 40 and the expiratory check valve 39, a branch 99 can be led, which can be referred to as a condensate cup branch, and at the end portion of the branch 99, a detachable condensate cup 65 can be provided. The liquid water formed by condensation of the water vapor contained in the exhalation of the patient 42 can be collected in the condensate cup 65 via the condensate cup branch 99. In the state where the condensate cup 65 is connected to the condensate cup branch 99, the condensate cup 65 can close the condensate cup branch 99; in the state where the condensate cup 65 is separated from the condensate cup branch 99, for example, when the condensate cup 65 is detached from the condensate cup branch 99, the condensate cup branch 99 is open to the atmosphere, or in other words, communicates with the ambient air.

[0036] Figure 1 The inspiratory valve 28, IP valve 30, solenoid valve 27, air resistance 29, safety valve 31 and filter 6 are also shown in

[0037] Figure 2 The breathing circuit structure shown can be used to implement Figure 1 the part enclosed by the dashed line box A in the breathing circuit shown. As Figure 2 indicated, the breathing circuit structure can generally include a circuit assembly 1000, a coil assembly 2000, a gas control connection plate assembly 3000 and a carbon dioxide absorption canister 4000. The coil assembly 2000 can functionally correspond substantially to the coil 34 in Figure 1 , the carbon dioxide absorption canister 4000 can functionally correspond substantially to the absorption canister 37 in Figure 1 , and the circuit assembly 1000 can functionally correspond generally to the part in Figure 1 enclosed by the dashed line box A except the coil 34 and the absorption canister 37. The circuit assembly 1000 can include an expiratory connector 1001 and an inspiratory connector 1002 for mounting the expiratory tube and inspiratory tube (not shown) leading to the patient, respectively, so as to Figure 1The required inhalation gas is provided to the patient 42 and the exhaled gas from the patient 42 is received as shown. The expiratory connector 1001 and the inspiratory connector 1002 can be formed in a curved shape and have a section extending downward or obliquely downward after being installed in place, which makes it more convenient for the operator to manually install the breathing tube and the inspiratory tube. In particular, for the expiratory connector 1001, compared to a straightly extending connector, in the case where water vapor in the patient's exhalation condenses into water at this point, such an expiratory connector 1001 can prevent the condensed water from flowing back to the circuit assembly 1000. The circuit assembly 1000 can further include a manual bag connector 1003 for connecting the manual bag 45 as shown. Figure 1 The carbon dioxide absorption tank 4000 can be a soda lime tank or can be an absorption device containing other types of carbon dioxide adsorbents. The gas control connection plate assembly 3000 can serve as an interface between the fresh gas entering the breathing circuit and the first to third driving gases 61-63 and the circuit assembly 1000. Figure 1

[0038] As shown in the exploded view of Figure 3-4 , 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 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 serve as an interface for the gas flow between the coil assembly 2000 and the circuit assembly 1000 or the circuit main body 1000a. To this end, the circuit connection block 1000b can include tubes 1011 and 1012, the ends of which towards the coil assembly 2000 (the ends are not visible in Figure 3 and visible in Figure 4 ) are capable of being sealedly mated with the gas ports 2001 and 2002 of the coil assembly 2000 in the assembled state, respectively, and the ends of which towards the circuit main body 1000a are capable of being port-sealingly mated with the corresponding gas ports of the circuit main body 1000a in the assembled state, respectively. The term "port-sealingly mated" used herein and elsewhere in this application refers to a connection manner in which one opening, hole, tube or passage is connected with another opening, hole, tube or passage by being inserted into the other or directly abutting against each other and optionally with the aid of a sealing ring or the like sealing member and maintaining fluid communication between the two.

[0039] ​The circuit connection block 1000b may also include a waste discharge channel 1013 formed within the connection block body 1016. Waste gas 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 port 1014, for example, flowing towards Figure 1 The AGSS shown. See also Figure 4 The cover plate 1015 can be sealed to the connecting block body 1016, and can define together with the connecting block body 1016 in the assembled state as follows: Figure 3 Waste discharge channel 1013 is shown.

[0040] The coil assembly 2000 may include an upper housing 2003 and a lower housing 2004 that are detachably connected to each other, defining a curved airflow passage (not shown) between them, the two ends of which terminate at gas ports 2001 and 2002, respectively. (As previously stated...) Figure 1 As described in the coil 34, the coil assembly 2000 can receive and discharge driving gas (such as the third driving gas 63) and simultaneously contain reusable anesthetic gas (i.e., circulating gas). The driving and circulating gases can enter and exit the coil assembly 2000 via gas ports 2001 and 2002, and enter and exit the circuit body 1000a via conduits 1011 and 1012 of the circuit connection block 1000b of the circuit assembly 1000, to allow the desired flow of the third driving gas 63 and circulating gas during the expiratory and inspiratory 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 extending outward from its lower housing 2004. In the assembled state, the connecting portion 2005 may extend to the underside of the loop connection block 1000b and may be detachably connected to the loop connection block 1000b by means of fasteners (e.g., handwheels, not shown).

[0041] The gas control connection plate assembly 3000 can include positioning guide shafts 3001 and 3002 and hooks 3003 and 3004 so as to enable the gas control connection plate assembly 3000 to be detachably connected to the circuit assembly 1000. Upon assembly, the positioning guide shafts 3001 and 3002 of the gas control connection plate assembly 3000 can be respectively aligned with and inserted into the corresponding receiving holes (not shown) of the circuit assembly 1000 until the hooks 3003 and 3004 are respectively snapped into the corresponding snap 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 pre-set so that, upon assembly, the various interfaces at the gas control connection plate assembly 3000 can be precisely aligned with the corresponding interfaces at the circuit assembly 1000. It is 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, which arrangement helps to further enhance 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, in order to facilitate the separation of the gas 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 gas control connection plate assembly 3000. The transmission member 3005 can be operatively connected with the unlocking button 1004, while the transmission member 3005 can also be operatively connected with the hooks 3003 and 3004 via a suitable transmission mechanism (not shown). In this way, upon unlocking, the unlocking button 1004 can be pressed, which in turn presses the transmission member 3005 downward, which in turn moves the hooks 3003 and 3004 in the unlocking direction until the unlocking state is reached, and finally the gas control connection plate assembly 3000 can be pulled outward to separate it from the circuit assembly 1000.

[0043] The circuit main body 1000a can be shaped as a substantially cuboid-shaped flat block as a whole, which can include a circuit housing 1100 and functional components mounted on and received in the circuit housing 1100. Unlike the way realized by the integrated block in the prior art, the functional components received in the circuit housing 1100 adopt a split design concept, which is more clearly seen in Figure 4 and Figure 5 For the convenience of description, Figure 4 and Figure 5The first direction (X-axis direction) is indicated by the arrow mark, the second direction (Y-axis direction) is perpendicular to the first direction, and the third direction (Z-axis direction) is perpendicular to the plane of the first direction and the second direction (horizontal plane).

[0044] Figure 4 An exploded view of the circuit assembly 1000 is shown, wherein the remaining parts other than the circuit connecting block 1000b and the absorption tank 4000 belong to the circuit main body 1000a shown in Figure 3 . As shown in Figure 4 , Figure 3 The circuit housing 1100 indicated in Figure 5 itself can include a circuit lower shell 1101, a circuit baffle 1102, and a circuit upper cover 1103. The functional components accommodated in the circuit housing 1103 can include an exhalation valve assembly 1200 and an assembly indicated by the arrow B assembled together, and the functional components contained in the assembly B are further separated from each other in Figure 1 to clearly show the structure and mutual connection and arrangement relationship of each functional component under the split idea. The reason why the functional components inside the circuit main body 1000a are divided into the exhalation valve assembly 1200 and the assembly B is that there can be no communication in the gas path between the exhalation valve assembly 1200 and the assembly B inside the circuit housing 1100, while there is communication in the gas path between most of the functional components (except the heating functional component) contained in the assembly B. The exhalation valve assembly 1200 can correspond to the exhalation valve 32 shown in

[0045] Referring to Figure 5 , the assembly B can include an inhalation 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 bladder assembly 1700, and a manual motor-controlled valve assembly 1800. These components listed are separated from each other and can be detachably assembled together.

[0046] As shown in Figure 5 , the inhalation flow probe assembly 1500b can be detachably inserted into the inhalation probe base assembly 1500a. The inhalation flow probe assembly 1500b can correspond to the inhalation flow probe 34 shown in Figure 1The inspiratory flow probe 41 is used to detect the inspiratory flow of the patient. The inspiratory flow probe assembly 1500b can be generally shaped as a long cylinder with two open ends to define a flow passage 1503 therein, wherein the inspiratory flow probe assembly 1500b and the flow passage 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 the wall of the cylinder. The first and second through holes 1504 and 1505 can extend substantially along the Z-axis direction and communicate with the flow passage 1503, and are arranged in 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 outside of the wall of the cylinder, which are arranged on the two sides of the first through hole 1504 respectively, 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 arranged in the flow passage 1503, which is located between the first through hole 1504 and the second through hole 1505.

[0047] The inspiratory flow probe base assembly 1500a can be shaped as a cuboid block as a whole, and can have a passage 1508 extending along the X-axis direction formed therein. The passage 1508 defines a passage for the flow of the breathing circuit on one hand, and is used to receive the inspiratory flow probe assembly 1500b to be inserted on the other hand. The inspiratory flow probe base assembly 1500a can also have a first tube joint 1509 and a second tube joint 1510 extending along the Z-axis direction on the outside thereof, and located in a straight line along the X-axis direction.

[0048] In the assembled state of the inspiratory flow probe assembly 1500b and the inspiratory flow probe base assembly 1500a, the inspiratory flow probe assembly 1500b is inserted into the inspiratory flow probe base assembly 1500a. In the assembled state, the first through hole 1504 and the second through hole 1505 of the inspiratory flow probe assembly 1500b are aligned with and in fluid communication with the first tube joint 1509 and the second tube joint 1510 of the inspiratory flow probe base assembly 1500a respectively. In order to facilitate the alignment, the inspiratory flow probe assembly 1500b has an alignment mark 1511 at the outer end thereof, which can be in the form of a protrusion and is located on or defines a straight line along the X-axis direction. Correspondingly, the inspiratory flow probe base assembly 1500a has a corresponding alignment mark 1512 on the wall of the cylinder, which is located on or defines a straight line along the X-axis direction. Figure 4The suction port 1105 of the lower circuit housing 1101 has a notch at its top along the Z-axis that mates with the alignment mark 1511. Thus, after the suction probe base assembly 1500a is installed in the lower circuit housing 1101, during the process of inserting the suction flow probe assembly 1500b through the suction port 1105 and into the channel 1508 of the suction probe base assembly 1500a, alignment between the through holes 1504 and 1505 and the pipe fittings 1509 and 1510 can be achieved in the rotational direction about the X-axis, provided that the alignment mark 1511 is aligned with and enters the notch of the suction port 1105. To achieve alignment in the linear direction along the X-axis, the dimensions of the components can be pre-designed so that the suction flow probe assembly 1500b is in the aligned position in the linear direction along the X-axis when it cannot be inserted further.

[0049] The expiratory flow probe assembly 1600b can be detachably inserted into the expiratory probe base assembly 1600a. Functionally, the expiratory flow probe assembly 1600b essentially corresponds to... Figure 1 The expiratory flow probe 40 shown is used to detect a patient's expiratory flow rate. The expiratory flow probe assembly 1600b may have a substantially the same structure as the inspiratory flow probe assembly 1500b, the difference possibly being that the airflow directions through the probes differ during operation, resulting in different bending directions of the internal elastic diaphragms. Therefore, to distinguish these two flow probe assemblies and avoid confusion, the alignment mark (not shown) of the expiratory flow probe assembly 1600b may differ in size from the alignment mark 1511 of the inspiratory flow probe assembly 1500b, allowing for external differentiation without disassembling the assembly or attempting to observe the internal diaphragm.

[0050] The expiratory probe base assembly 1600a may have a structure substantially the same as that of the inspiratory probe base assembly 1500a. The expiratory probe base assembly 1600a may include a channel 1608 substantially the same as channel 1508, and connectors 1609 and 1610 substantially the same as connectors 1509 and 1510. Furthermore, the relative arrangement between the expiratory flow rate probe assembly 1600b and the expiratory probe base assembly 1600a is also substantially the same as the relative arrangement between the inspiratory flow rate probe assembly 1500b and the expiratory probe base assembly 1600a. The expiratory probe base assembly 1600a differs from the inspiratory probe base assembly 1500a in that it has a water collection cup connector 1612 for connecting... Figure 4 The water collection cup 1005 shown is functionally equivalent to... Figure 1 The water collection cup 65 shown, and the water collection cup connector 1612, can be functionally substantially corresponding to Figure 1The water trap cup branch 99 is shown in FIG. 1 1. Figure 4 The water trap cup joint 1612 extends outwardly along the Z-axis direction at the lower portion of the exhalation probe base assembly 1600a and, in the assembled state, passes downwardly through the lower circuit housing 1 101 and extends to the outside of the lower circuit housing 1 101 to facilitate connection and disconnection of the water trap cup 1005 to / from the water trap cup joint 1512 outside of the circuit housing 1 100. Figure 3 The water trap cup joint 1612 can be in communication with the airflow passage defined within the exhalation probe base assembly 1600a, such that liquid water formed by condensation of water vapor contained in the patient's exhalation can be collected into the water trap cup 1005 via the water trap cup joint 1612.

[0051] Referring to Figure 4 , in the assembled state, the inspiration phase assembly 1400 forms a port-sealing abutment with the inspiration probe base assembly 1500a on the other side opposite to the inspiration flow probe assembly 1500b. More specifically, referring to Figure 5 , the channel 1508 of the inspiration probe base assembly 1500a on the side opposite to the inspiration flow probe assembly 1500b can form a port-sealing abutment with the opening 1403 of the inspiration phase assembly 1400. The inspiration phase assembly 1400 is primarily functionally for implementing the inspiration check valve 38 in Figure 1 , and also for receiving fresh gas as shown in Figure 1 , and for housing a sensor for measuring the oxygen concentration in the patient's inspiration.

[0052] The inspiration phase assembly 1400 includes a substantially cylindrical inspiration check valve seat 1401 extending along the vertical (Z-axis) direction. Figure 4 The inspiration valve disc 1006 in Figure 1 can be used as the valve core of the inspiration check valve and, in the assembled state, can be placed through the opening of the upper circuit cover 1 103 at the top end portion of the inspiration check valve seat 1401, and then the inspiration valve disc cover 1007 is screwed into the opening of the upper circuit cover 1 103 with its lower end portion sealingly abutting the top end portion of the inspiration check valve seat 1401. In this way, the inspiration check valve seat 1401, the inspiration valve disc 1006 and the inspiration valve disc cover 1007 together form an inspiration check valve to functionally correspond to the inspiration check valve 38 in

[0053] In Figure 5As can be seen, the inspiratory phase assembly 1400 also includes a fresh gas conduit 1404, through which fresh gas containing anesthetic from a fresh gas source can enter the inspiratory check valve. The fresh gas conduit 1404 extends from the inspiratory check valve seat 1401 along the X-axis to the circuit baffle 1102 of the circuit housing, and then connects to a fresh gas source (not shown) at the gas control connection plate assembly 3000, as can be seen from [reference needed]. Figure 3 and Figure 4 To learn, despite Figure 3 and Figure 4 The fresh gas duct 1404 is not visible due to being obstructed or covered.

[0054] Figure 6 It shows Figure 5 A cross-sectional view of the intake phase assembly 1400 taken along the YZ plane, passing through the central axis C of the intake check valve, with the additional assembled intake valve 1006 and intake valve cover 1007. (See attached image.) Figure 6 As shown, the inspiratory one-way valve seat 1401 has a first canister connection port 1406 located at its bottom end and an inlet passage 1405 extending vertically (Z-axis direction), the first canister connection port 1406 and the inlet passage 1405 forming fluid communication. The first canister connection port 1406 is open along the Z-axis direction to facilitate a port-sealed connection with a first opening 4001 of the carbon dioxide absorption canister 4000 that opens upward along the Z-axis direction, so as to receive gas processed by the carbon dioxide absorption canister 4000. The inspiratory one-way valve seat 1401 has a sandwich structure at its upper part to define an outlet passage 1407 between the sandwich structures. The inspiratory valve 1006 is located in the flow path between the inlet passage 1405 and the outlet passage 1407 and is configured to allow the patient's inhalation to flow from the inlet passage 1405 to the outlet passage 1407, but not to allow gas to flow from the outlet passage 1407 to the inlet passage 1405. Figure 6 You can also see opening 1408 in the middle. Figure 5 The fresh gas pipe 1404 is connected at the opening 1408 to the intake passage 1405 of the intake check valve seat 1401. Figure 6 Blind hole 1409 and openings 1410 and 1411 can also be seen, wherein blind hole 1409 can be used to receive... Figure 3 The guide shaft 3002 of the central control air connection plate assembly 3000 has an opening 1410 that can be used as a paramagnetic oxygen sampling port and an opening 1411 that can be used as an airway pressure sampling port.

[0055] The inspiratory chamber 1402 can be in fluid communication with the outlet passage 1407 of the inspiratory one-way valve seat 1401, so that the patient's inhalation will enter the inspiratory chamber 1402 from the outlet passage 1407.Figure 7 As shown, the inhalation chamber 1402 can have a sensor mounting structure for receiving an oxygen concentration sensor (e.g. an oxygen cell) to measure the oxygen concentration in the patient's inhalation.

[0056] Referring to Figure 7- Figure 9 , the sensor mounting structure can include a mounting seat 1412 formed at the first side wall 1415 of the inhalation chamber 1402. The mounting seat 1412 can include a cylindrical body 1414, for example, circular in shape, which defines an elongated guide hole 1413 inside. The guide hole 1413 can be formed as a blind hole with a closed outer end. The extension direction of the guide hole 1413 is substantially along the Y-axis direction (i.e. the second direction) as shown in Figure 5 . A push rod 1416 is arranged inside the chamber 1402 and has a rod portion 1417 and a blocking portion 1418. The blocking portion 1418 can be formed at the right end of the rod portion 1417. The rod portion 1417 of the push rod 1416 can extend into the guide hole 1413. The guide hole 1413 can receive and guide the rod portion 1417 of the push rod 1413 so that the push rod 1416 can reciprocate along the extension direction of the guide hole 1413 (i.e. the second direction). The mounting seat 1412 can further include a groove 1428 extending circumferentially on the outside of the cylindrical body 1414 for accommodating the end of the biasing spring 1414 towards the mounting seat 1412.

[0057] The mounting seat 1412 can be integrally formed with the first side wall 1415 of the inhalation chamber 1402 and can extend outwards from the first side wall 1415 towards the outside of the chamber to reduce the occupation of the internal volume of the chamber.

[0058] A sensor interface 1420 can be formed at a second side wall 1419 opposite to the first side wall 1415 in the second direction. The sensor interface 1420 can be generally cylindrical in shape and defines a mounting through hole 1421 inside. The sensor interface 1420 can have a first end 1422 towards the first side wall 1415 and a second end 1423 opposite to the first end 1422. The mounting through hole 1421 can pass through the first end 1422 and the second end 1423 and receive the oxygen concentration sensor 1008 (see Figure 3 and Figure 8 ) to be mounted inside.

[0059] The biasing spring 1424 can apply a biasing force to the push rod 1416 towards the sensor interface 1420 so that the push rod 1416 moves towards 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 obturator 1418 of the push rod 1416 abuts against the first end portion 1422 of the sensor interface 1420 to close the mounting through hole 1421 of the sensor interface 1420 on one side.

[0060] The obturator 1418 of the push rod 1416 includes an enlarged portion 1425 that is enlarged in the transverse dimension relative to the rod portion 1417, and the enlarged portion 1425 is sized to abut 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 coil spring that surrounds the rod portion 1417 of the push rod 1416, and the coil spring is confined in a compressed state between the mounting seat 1412 and the enlarged portion of the obturator 1418. In this way, the enlarged portion 1425 of the push rod 1416 serves to both obturate the mounting through hole 1421 of the sensor interface 1420 and to position the biasing spring 1424.

[0061] The obturator 1418 of the push rod 1416 can further include a seal ring carrier portion 1426 and a first seal ring 1427 that can be disposed in a groove (not identified) around the outer peripheral wall of the seal ring carrier portion 1426. As shown, the seal ring carrier portion 1426 is sized to extend into the mounting through hole 1421 of the sensor interface 1420 so that the first seal ring 1427 is between and seals against the inner peripheral wall of the mounting through hole 1421 and the outer peripheral wall of the seal ring carrier portion 1426. Figure 8

[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 probe end portion 1008a of the oxygen concentration sensor 1008 passes through the mounting through hole 1421 of the sensor interface 1420 and extends out of the first end portion 1422 of the sensor interface 1420 to enter the interior of the chamber 1420 to probe the oxygen concentration in the gas therein. During insertion of the oxygen concentration sensor 1008, the probe end portion 1008a of the oxygen concentration sensor 1008 pushes the obturator 1418 of the push rod 1416 away from the first end portion 1422 of the sensor interface 1420. The oxygen concentration sensor 1008 can have a second seal ring 1008b disposed on the outer peripheral wall thereof. In the case where the oxygen concentration sensor 1008 is installed in place, the second seal ring 1008b is between and seals against the inner peripheral wall of the mounting through hole 1421 of the sensor interface 1420 and the outer peripheral wall of the oxygen concentration sensor 1008.

[0063] ​Further, an internal thread (not shown, but apparent from the figure) can be formed at the second end 1423 of the sensor interface 1420, and an external thread that cooperates with the internal thread is formed at 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 manner, and a firm connection between the oxygen concentration sensor 1008 and the sensor interface 1420 is achieved.

[0064] Returning to Figure 7 , the second side wall 1419 of the inhalation chamber 1402 can be detachable, the sensor interface 1420 can be integrally formed with the second side wall 1419, and the sensor interface 1420 is sealingly connected to the inhalation chamber 1402 using a fastener 1429 and a sealing ring 1430.

[0065] The manual motor control valve assembly 1800 will be described below with reference to Figure 4 , Figure 5 and Figure 10 , which can correspond in function to the manual motor control valve 35 in Figure 1 . The manual motor control valve assembly 1800 can extend in 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 be port-sealingly docked with the manual bladder assembly. The manual motor control valve assembly 1800 can include a control gas inlet 1801 that receives a control gas, a manual vent port 1804 that is in fluid communication with the manual bladder, a motor control vent passage 1805 that is in fluid communication with the coil assembly 2000, an exhalation inlet conduit 1806 that is in fluid communication with the exhalation phase assembly 1300, and an inhalation outlet interface 1807 that is in fluid communication with the second opening 4002 of the carbon dioxide absorption canister 4000. The manual vent port 1804 can be formed at the end of the manual motor control valve assembly 1800 that faces the manual bladder assembly 1700, and can be port-sealingly docked with the corresponding opening of the manual bladder assembly 1700. The control gas inlet 1801 is located at the end of the manual motor control valve assembly 1800 that faces away from the manual bladder assembly 1700, which can receive driving gas (e.g., the first driving gas 61 in Figure 1 ) as a control gas from a driving gas source, so as to change the working state of the manual motor control valve under the pressure of the control gas, so that it is selectively in one of the motor control state and the manual state. The motor control vent passage 1805 and the exhalation inlet conduit 1806 can extend from the manual motor control valve assembly 1800 in the Y-axis direction, and the inhalation outlet interface 1807 is formed at the bottom of the manual motor control valve assembly 1800 and opens downward in the Z-axis direction. Inside the manual motor control valve assembly 1800, the exhalation inlet conduit 1806 and the inhalation outlet interface 1807 communicate with the motor control vent passage 1805 via an internal passage 1810.

[0066] The driving gas entering the inside of the manual motor control valve assembly 1800 through the control gas inlet 1801 forces the diaphragm 1802 to move to the left (away from the control gas inlet 1801), which in turn pushes the bracket 1808 with the sealing diaphragm 1803 to move to the left until the sealing diaphragm 1803 closes the manual vent port 1804 of the manual motor control valve assembly 1800, i.e. the sealing diaphragm 1803 is in the position shown in the figure. At this time, the manual motor control valve assembly 1800 is in the motor control state, and the biasing spring 1809 originally in the compressed state is further compressed. In this motor control state, during the patient's exhalation cycle, the patient's exhalation enters the inside of the manual motor control valve assembly 1800 from the exhalation inlet conduit 1806, and then flows out from the motor control vent passage 1805 and flows to the coil assembly 2000; during the patient's inhalation cycle, the gas from the coil assembly 2000 enters the inside of the manual motor control valve assembly 1800 from the motor control vent passage 1805, and then flows out from the inhalation outlet interface 1807 and flows to the carbon dioxide absorption tank 4000. Figure 10

[0067] When switching the manual motor control valve assembly 1800 from the motor control state shown in the figure to the manual state, first, the driving gas is cut off from the control gas inlet 1801, so that the compressed biasing spring 1809 begins 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, so that the sealing diaphragm 1803 opens the manual vent port 1804, and continues to move to the right to close the internal passage 1810. At this time, the manual motor control 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 exhalation enters the inside of the manual motor control valve assembly 1800 from the exhalation inlet conduit 1806, and then flows out from the manual vent port 1804 and flows to the manual bladder; during the patient's inhalation cycle, the gas from the manual bladder enters the inside of the manual motor control valve assembly 1800 from the manual vent port 1804, and then flows out from the inhalation outlet interface 1807 and flows to the carbon dioxide absorption tank 4000. Figure 10

[0068] The manual motor control valve assembly 1800 can further include a sampling tube interface 1811 at the top thereof for connecting the sampling tubes 1901 of the flow probe, which can be seen in Figure 5 . As shown in Figure 5 , the manual motor control valve assembly 1800 can have four sampling tube interfaces 1811 respectively connected to one end of four sampling tubes 1901, and the other ends of the four sampling tubes 1901 are respectively connected to the two tube joints 1509 and 1510 of the inhalation probe base assembly 1500a and the two tube joints 1609 and 1610 of the exhalation probe base assembly 1600a.

[0069] Referring to Figure 5 ​​The expiratory phase assembly 1300 can include an expiratory check valve seat 1301 which is substantially cylindrical and extends along the vertical (Z-axis) direction. Figure 4 The expiratory flap 1009 in the expiratory phase assembly 1300 can be used as the valve core of the expiratory check valve, and when assembled, it can be placed at the top end of the expiratory check valve seat 1301 through the opening of the circuit upper cover 1103, and then the expiratory flap cover 1010 is screwed into the opening of the circuit upper cover 1103, and the lower end thereof is in sealing abutment with the top end of the expiratory check valve seat 1301. In this way, the expiratory check valve seat 1301, the expiratory flap 1009 and the expiratory flap cover 1010 together form an expiratory check valve to functionally correspond to the expiratory check valve 39 in the expiratory phase assembly 1300. Figure 1 The expiratory phase assembly 1300 is formed with an expiratory inlet 1302 adjacent to the lower end thereof and an expiratory outlet conduit 1303 adjacent to the upper end thereof at the lateral peripheral wall of the valve seat check valve seat 1301. The expiratory inlet 1302 of the expiratory phase assembly 1300 can be open towards the X-axis direction and in sealing abutment with the channel 1608 of the expiratory probe base assembly 1600a to receive the patient's expiration from the expiratory probe base assembly 1600a. The expiratory outlet conduit 1303 can extend along the Y-axis direction towards the manual control valve assembly 1800 and can be in port sealing abutment with the expiratory inlet conduit 1806 of the manual control valve assembly 1800, so that the patient's expiration entering the expiratory phase assembly 1300 can pass through the expiratory outlet conduit 1303 and the expiratory inlet conduit 1806 into the manual control valve assembly 1800.

[0070] The expiratory phase assembly 1300 can also be integrated with a connecting conduit 1304. One end of the connecting conduit 1304 is in sealing abutment with the conduit 1012 (see Figure 3 and Figure 4 ) of the circuit connection block 1000b, and the other end is in sealing abutment with the control ventilation channel 1805 of the manual control valve assembly 1800 to form fluid communication between the coil assembly 2000 and the manual control valve assembly 1800. It should be noted that in Figure 5 , the right end of the connecting conduit 1304 is blocked by the expiratory outlet conduit 1303 and cannot be seen. Although the connecting conduit 1304 is not directly in gas flow communication with the expiratory check valve seat 1301 inside the expiratory phase assembly 1300, the connecting conduit 1304 can be integrally formed with the expiratory check valve seat 1301 or fixedly connected together by welding or gluing, which facilitates the simultaneous sealing abutment of the expiratory outlet conduit 1303 and the connecting conduit 1304 with the control ventilation channel 1805 and the expiratory inlet conduit 1806 of the manual control valve assembly 1800 by one insertion operation during assembly, and enhances the connection stability between the expiratory phase assembly 1300 as a whole and the adjacent components.

[0071] As Figure 5As shown, the manual bladder assembly 1700 may include a generally cylindrical APL valve seat 1701 extending vertically (Z-axis direction). Figure 4 The APL valve 1017 can be installed onto the valve seat 1701 through the opening in the circuit cover 1103. Functionally, the APL valve 1017 can correspond to... Figure 1 The APL valve 33 shown is illustrated. The valve seat 1701 may be formed with a bladder-like interface 1702 extending outward along the X-axis direction. Figure 4 The manual bladder connector 1003 shown can pass through the bladder interface hole 1106 of the lower circuit housing 1101 and seal with the bladder interface 1702. On the opposite side from the bladder interface 1702, the valve seat 1701 also has an opening (obscured in the figure) for sealing and fluid communication with the manual vent 1804 of the manual control valve assembly 1800. The manual bladder assembly 1700 also includes a drain pipe 1703, which can be integrally formed with the valve seat 1701 or fixedly connected in a suitable manner. Reference Figure 3 and Figure 4 The exhaust pipe 1703 extends along the Y-axis to the loop connection block 1000b and forms fluid communication with its exhaust channel 1013. Thus, the exhaust gas released through the APL valve 1017 can be transported via the exhaust pipe 1703 to the exhaust channel 1013 of the loop connection block 1000b, and then flow out through the exhaust port 1014 of the loop connection block 1000b to the outside of the breathing circuit, for example, flowing towards... Figure 1 The AGSS shown in the image.

[0072] The following description Figure 4 The exhalation valve assembly 1200 shown does not have direct gas communication with other components 1300-1800 within the circuit housing 1100. Figure 11 As shown, the exhalation valve assembly 1200 may include an exhalation valve 1205, which may be a gas-driven pneumatic valve. The exhalation valve assembly 1200 may also include a drive gas inlet pipe 1201, a drive gas passage pipe 1202, a waste pipe 1203, and a control gas inlet pipe 1204 extending outward from the exhalation valve 1205. Figure 4 As can be seen more clearly, the exhalation valve 1205 can extend generally along the Z-axis, while the drive air inlet tube 1202 and the waste outlet tube 1203 extend substantially along the Y-axis toward the left side of the lower circuit housing 1101. See also Figure 3 and Figure 4The drive gas vent tube 1202 can extend along the Y-axis direction through the circuit lower housing 1101 to form a port seal interface with the conduit 1011 of the circuit connection block 1000b, and the exhaust tube 1203 can extend along the Y-axis direction through the circuit lower housing 1101 to form a fluid communication with the exhaust channel 1013 in the circuit connection block 1000b. In Figure 4 , the drive gas intake tube 1201 and the control gas intake tube 1204 extend along the X-axis direction towards the circuit baffle 1102, but are not visible because they are substantially blocked by the exhalation valve 1205. The exhalation valve assembly 1200 can be a unitary assembly or module, that is, the exhalation valve 1205 and other components (e.g., the drive gas intake tube 1201, the drive gas vent tube 1202, the exhaust tube 1203, and the control gas intake tube 1204, or possibly additional components) are integrally formed or fixedly connected to each other.

[0073] Returning to Figure 11 , the exhalation valve 1205 can be disposed in the gas flow path between the drive gas intake tube 1201 and the exhaust tube 1203, and can take any suitable valve structure that uses gas to actuate, which is not described in detail here. The control gas intake tube 1204 can receive control gas from an external source to control the exhalation valve 1205, which can be part of the drive gas provided by the drive gas source, such as the second drive gas 62 in Figure 1 . During the inhalation phase of the machine-controlled mode, the control gas can cause the exhalation valve 1205 to close to break the gas flow path between the drive gas intake tube 1201 and the exhaust tube 1203. At this time, the drive gas intake tube 1201 receives drive gas (e.g., the third drive gas 63 in Figure 1 ) from the drive gas source, which enters the exhalation valve assembly 1200, and then exits the exhalation valve assembly 1200 via the drive gas vent tube 1202, and then is delivered to the coil assembly 2000 via the conduit 1011 of the circuit connection block 1000b. During the exhalation phase of the machine-controlled mode, the drive gas to both the control gas intake tube 1204 and the drive gas intake tube 1201 is broken, and the exhalation valve 1205 is reset to open the gas flow path between the drive gas intake tube 1201 and the exhaust tube 1203. In this way, gas from the coil assembly 2000 enters the exhalation valve assembly 1200 from the drive gas vent tube 1202, and then exits from the exhaust tube 1203. The gas in the exhaust tube 1203 exits to the outside of the breathing circuit, e.g., to the AGSS shown in Figure 1 , via the exhaust channel 1013 and the exhaust port 1014 of the circuit connection block 1000b.

[0074] Referring to Figure 4 and Figure 11The exhalation valve assembly 1200 can have a waste gas intake tube 1206 in fluid communication with the waste tube 1203. The waste gas intake tube 1206 can extend from the exhalation valve 1205 back toward the circuit baffle 1102 along the X-axis direction. The waste gas intake tube 1206 can receive waste gas from other sources outside of the exhalation valve assembly 1200 and expel it via the waste tube 1203. For example, as mentioned earlier, the paramagnetic oxygen sampling port can be used to draw a sample of gas from the breathing circuit. After use, the sample gas can be returned to the breathing circuit from the waste gas intake tube 1206 and expelled at the waste tube 1203.

[0075] Based on the foregoing description and with reference to Figure 4 and Figure 5 It can be seen that the exhalation valve assembly 1200, the exhalation phase assembly 1300, the inhalation phase assembly 1400, the inhalation probe base assembly 1500a, the inhalation flow probe assembly 1500b, the exhalation probe base assembly 1600a, the exhalation flow probe assembly 1600b, the manual bladder assembly 1700, and the manual motorized valve assembly 1800, which are disposed within the circuit housing 1100 of the circuit body 1000a, each form a module, respectively, each module providing a portion of the breathing circuit. The modules are separable from one another, and any two modules that are connected to one another and in fluid communication are connected in a port-seal abutment manner without the use of any fasteners. Moreover, the modules can each be a unitary module. The term "unitary module" as used herein and elsewhere in this application means that the functional components of the module are connected to one another in an integral or fixed manner so that the module is handled as a unit when connected to other modules or other external functional components during assembly. This can be seen clearly by the assembly process described below.

[0076] Referring to Figure 5When assembling, the inspiratory probe base assembly 1500a, the manual bulb assembly 1700 and the expiratory probe base assembly 1600a can be arranged in sequence along the Y-axis direction and placed on the silicone heating sheet 1902, and then fixed and connected with the heating lining plate 1903 from below along the Z-axis direction by fastening screws (not shown) after being pressed tightly. It should be understood that the silicone heating sheet 1902 and the heating lining plate 1903 here are not used to form the breathing circuit, so the use of fastening screws here does not violate the description above that no fasteners are used for the connection between the modules for forming the breathing circuit in the circuit housing 1100 of the circuit main body 1000a. Then, the opening 1403 of the inspiratory phase assembly 1400 is port-sealingly butted along the X-axis direction to the channel 1508 of the inspiratory probe base assembly 1500a on the side away from the inspiratory flow probe assembly 1500b. Next, the connecting pipe 1304 and the expiratory outlet pipe 1303 of the expiratory phase assembly 1300 are port-sealingly inserted into the machine-controlled ventilation channel 1805 and the expiratory inlet pipe 1806 of the manual machine-controlled valve assembly 1800 along the Y-axis direction. After that, the expiratory phase assembly 1300 and the manual machine-controlled valve assembly 1800 are port-sealingly butted to the expiratory probe base assembly 1600a and the manual bulb assembly 1700 along the X-axis direction, so that the expiratory inlet 1302 of the expiratory phase assembly 1300 is port-sealingly butted to the channel 1608 of the expiratory probe base assembly 1600a on the side away from the expiratory flow probe assembly 1600b along the X-axis direction, and the manual ventilation port 1804 of the manual machine-controlled valve assembly 1800 is port-sealingly butted to the corresponding opening (not shown) of the manual bulb assembly 1700. Then, the inspiratory flow probe assembly 1500b and the expiratory flow probe assembly 1600b are port-sealingly inserted into the channel 1508 of the inspiratory probe base assembly 1500a and the channel 1608 of the expiratory probe base assembly 1600a, respectively. Figure 10 After the above assembly is completed, the assembly body B in Figure 4 is formed, and in combination with the expiratory valve assembly 1200 shown in Figure 4 which has no direct connection relationship with the assembly body B, the connection and arrangement of the modules in the circuit housing 1100 of the circuit main body 1000a are completed.

[0077] As can be seen from the assembly process above, the modules are separable from each other, thus realizing a split structure different from the integrated block structure of the prior art. For the split structure, the design of each module has greater freedom, which on one hand can form the airway in an optimized way with smaller dead space, thus improving the gas delivery performance of the breathing circuit structure, and on the other hand can allow functional components (such as oxygen concentration sensors) that cannot be integrated in the circuit body in the prior art to be built-in in the circuit body, thus realizing greater integration. The split structure also allows the functional components required in the breathing circuit to be dispersed in the modules, thus making it easier to detect and determine the specific leakage position in case of sealing leakage, and only the module needs to be replaced when a module is damaged, thus saving costs. When the breathing circuit is sterilized, since the split structure of the present application can form the airway in an optimized way and has smaller dead space as mentioned above, the sterilization effect is better than that of the integrated block structure.

[0078] As can also be seen from the assembly process above, for any two modules that need to be directly connected to each other, they are connected in a port-sealing butt joint manner without using any fasteners. Moreover, it can be seen that the modules are arranged in an extension plane (X-Y plane) defined by the X-axis direction and the Y-axis direction; the direction of each port-sealing butt joint formed between the modules is also in or parallel to the extension plane, or even along one of the X-axis direction and the Y-axis direction. This makes the connection between the modules very easy to operate, and on the other hand, only the port-sealing butt joint is formed in two mutually perpendicular directions (X-axis direction and Y-axis direction), which can also better ensure that external force is applied in the correct direction during assembly, thus ensuring the connection and sealing effect of the port-sealing butt joint. In addition, the modules are arranged in a plane to form a flat cuboid as a whole, which is also suitable for being stably held in a flat cuboid-shaped circuit housing 1100. In addition, the sealing between the two modules using port-sealing butt joint is preferably in a radial sealing manner. The seal (such as a sealing ring) is usually located between two surfaces of the two modules that face each other; for radial sealing, the two surfaces corresponding to the seal face each other in a direction substantially perpendicular to the butt joint direction; for axial sealing, the two surfaces corresponding to the seal face each other along the butt joint direction. Compared with axial sealing, the port-sealing butt joint in this embodiment uses radial sealing, which can not need to provide additional pressure to maintain sealing. Of course, for radial sealing, it is more suitable for the case where one opening, hole, pipe or channel is sealed and connected to another opening, hole, pipe or channel by inserting into the other, which forms two surfaces facing each other in a direction perpendicular to the insertion direction, and the seal can be arranged between the two surfaces.

[0079] Of course, in other embodiments, the division of the modules can be done in other ways, for example, the inspiratory probe base assembly 1500a can be combined with the inspiratory phase assembly 1400 into one module, the expiratory probe base assembly 1600a can be combined with the expiratory phase assembly 1300 into one module, and / or the expiratory one-way valve seat 1301 and the connecting conduit 1304 of the expiratory phase assembly 1300 can be divided into two modules.

[0080] For each of the various module divisions, each module is preferably formed as a unitary module. As used herein and elsewhere in this application, a unitary module is a module in which the various functional components are connected to each other in a manner that they are either integrally formed or fixedly connected to each other so that they can be handled as a unit when being assembled to other modules or other external functional components. Figure 4 and Figure 5 Each of the expiratory 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 bladder assembly 1700, and the manual motorized valve assembly 1800 shown in FIGS. 1-18 are unitary modules. Of course, in other embodiments, the modules can be non-unitary modules, for example, having portions that are movably connected to each other. In other embodiments, only some of the modules can be unitary modules, while others are non-unitary modules.

[0081] The assembly process of the breathing circuit structure is continued as follows. Referring to Figure 4 The expiratory valve assembly 1200 and the assembled assembly B are secured to the lower circuit housing 1101 from the outside of the lower circuit housing 1101 by fastening screws (not shown). Then, as shown in FIG. 18, the expiratory phase assembly 1300 is assembled to the expiratory valve assembly 1200 and the assembled assembly B. Figure 5As shown, one end of each of the four sampling tubes 1901 is respectively inserted into two tube joints 1509 and 1510 of the inspiratory probe base assembly 1500a and two tube joints 1609 and 1610 of the expiratory 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 valve block assembly 1800, so that the sampling tubes 1901 are generally extended on top of the respective assemblies or modules. It is noted that the sampling tubes 1901, although located within the circuit housing 1100, are not included in the concept of "modules" within the circuit housing 1100 as described above. Next, the expiratory joint 1001, the inspiratory joint 1002 and the manual bulb joint 1003 are respectively inserted through the expiratory interface hole 1107, the inspiratory interface hole 1105 and the bulb interface hole 1106 of the circuit lower housing 1101 along the X-axis direction; and the three joints 1001-1003 are fixed and compressed by the lock nuts 1018, so that the three joints 1001-1003 are respectively and stably port-sealed with the expiratory flow probe assembly 1600b, the inspiratory flow probe assembly 1500b and the manual bulb assembly 1700 along the X-axis direction, thereby respectively and correspondingly forming fluid communication. This joint installation method can disassemble the joints without using tools, and directly take out the expiratory flow probe assembly 1600b or the inspiratory flow probe assembly 1500b from the expiratory and inspiratory interface holes 1107 and 1105, to facilitate replacement of the diaphragm in the flow probe assembly.

[0082] Next, the circuit baffle 1102 and the circuit upper cover 1103 are respectively fixedly connected with the circuit lower housing 1101, and then the cover plate 1015 of the circuit connection block 1000b is fixedly connected to the circuit lower housing 1101 along the Y-axis direction by fastening screws (not shown), and then the connection block body 1016 of the circuit connection block 1000b is fixed to the cover plate 1015 by fastening screws (not shown). Next, the inspiratory flap 1006 is placed on top of the inspiratory one-way valve seat 1401 of the inspiratory phase assembly 1400 through the opening of the circuit upper cover 1103, and the inspiratory flap cover 1007 is screwed into the corresponding opening of the circuit upper cover 1103, and the expiratory flap 1009 and the expiratory flap cover 1010 are installed in the same way. Then, the APL valve 1017 is installed on top of the valve seat 1701 of the manual bulb assembly 1700 through the corresponding opening of the circuit upper cover 1103. Then, the carbon dioxide absorption canister 4000 and the water cup 1005 are installed on the bottom of the circuit lower housing 1101. Finally, referring to Figure 3The connection portion 2005 of the coil assembly 2000 is secured to the bottom of the assembled circuit assembly 1000 with fasteners (not shown); the positioning guide shafts 3001 and 3002 of the gas control connection plate assembly 3000 are inserted into the corresponding guide holes of the circuit assembly 1000, and are snapped to the circuit assembly 1000 with the hooks 3003 and 2004; and the oxygen concentration sensor 1008 (e.g., an oxygen cell) is inserted into place from the circuit housing 1100.

[0083] It is noted that the various functional components described above as being mounted externally to the circuit housing 1100, such as the inspiratory valve 1006 and the expiratory valve 1009, although possibly being partially or entirely inside the circuit housing 1100, are not included in the concept of the "modules" described above as being arranged inside the circuit housing 1100. As described above, the expiratory 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 bulb assembly 1700, and the manual motorized valve assembly 1800 are "modules" that are arranged inside the circuit housing 1100 of the circuit body 1000a, and can only be mounted and arranged before the circuit housing 1100 is closed. The split-body concept of the present application is only directed to the functional components that need to be arranged inside the circuit housing 1100 before the circuit housing 1100 is closed.

[0084] Another feature of the present application is described below, which relates to the water trap cup mentioned in the present application. As shown in Figure 4 the water trap cup 1005 is connected at the water trap cup joint 1612 of the expiratory probe base assembly 1600a. In the prior art, a water trap cup that performs substantially the same function is usually provided at the coil assembly 2000 as shown in Figure 2 and Figure 3 When the position of the water trap cup is changed from the coil assembly 2000 to the water trap cup joint 1612 of the present application, or a water trap cup is added at the water trap cup joint 1612, the inventors of the present application surprisingly found that this helps to calibrate the expiratory and inspiratory flow probes in the breathing circuit structure.

[0085] It is understood that when calibrating the flow probes in the breathing circuit, the flow probes need to be maintained in the breathing circuit, and the outlet side of the flow probes needs to be communicated to ambient air or the atmosphere. In the prior art breathing circuit structure, tedious preparatory work is required to achieve the aforementioned detection of the environment, for example, see Figure 4, the flap cover 1007 and 1010 need to be unscrewed, the flaps 1006 and 1009 need to be removed, and then the flap cover 1007 and 1010 need to be screwed back, and then one of the expiration joint 1001 and the inspiration joint 1002 needs to be plugged, and so on. In addition, each time of calibration can only be performed on one of the expiration flow probe and the inspiration flow probe.

[0086] When the water cup joint 1612 and the water cup 1005 are arranged in the way of the present application, the expiration flow probe and the inspiration flow probe can be simultaneously calibrated with simpler pre-preparation.

[0087] As mentioned before, the water cup joint 1612 and the water cup 1005 can respectively correspond to the water cup branch 99 and the water cup 65 in the schematic diagram of the breathing circuit. Figure 1 The method of calibrating the flow probes in the breathing circuit structure will be described below in connection with Figure 1 and Figure 3 for calibrating the inspiration flow probe 41 and the expiration flow probe 40.

[0088] Referring to Figure 3 , a connecting tube (not shown, for example, a corrugated tube) can be connected between the expiration joint 1002 and the inspiration joint 1001 to form fluid communication between the expiration joint 1002 and the inspiration joint 1001. The connecting tube is schematically indicated by a dashed line with reference numeral 97 in Figure 1 . This can be considered in Figure 1 that the connecting tube 97 directly forms fluid communication between the downstream of the inspiration flow probe 41 and the upstream of the expiration flow probe 40. Referring to Figure 1 , the water cup 65 can be detached or separated from the water cup branch 99 so that the water cup branch 99 is in communication with the external atmosphere. It can be understood that this forms a flow path that sequentially passes through the fresh gas branch 99, the inspiration one-way valve 38, the inspiration flow probe 41, the inspiration joint 1001( Figure 3 ), the connecting tube 97, the expiration joint 1002( Figure 3) and the expiratory flow probe 40, until the water trap branch 99. This flow path can be used as a detection flow path for the working gas when calibration is performed. In this way, when calibration is performed, the working gas is injected from the fresh gas branch 98, and the working gas will flow along the aforementioned detection flow path until it flows out from the water trap branch 99. By detecting the flow rate of the working gas flowing out from the water trap branch 99, and the output signal (for example, voltage signal) of the inspiratory flow probe 41 and the expiratory flow probe 40 corresponding to the flow rate, the inspiratory flow probe 41 and the expiratory flow probe 42 can be calibrated simultaneously. If the calibration using the flow rate of the working gas and the output signal of the flow probe is well known to those skilled in the art, it will not be described in detail here, and the present application only proposes a new way of forming a detection flow path for this calibration work.

[0089] It should be noted that when calibration is performed using the aforementioned detection flow path, in order to make the working gas flow out only through the water trap branch 99, some preliminary work can be done. When the anesthesia machine has both manual and machine control working modes, the preliminary work can include: switching the manual-machine control valve 35 to the manual state; blocking the manual bladder joint (for example, the manual bladder joint 1003) without connecting the manual bladder 45; and adjusting the air pressure threshold of the APL valve 33 to be higher than the maximum value of the normal working air pressure range of the working gas. The preliminary work is obviously less than that in the prior art. Figure 3

[0090] Finally, it should be noted that the above description is only to illustrate the technical solutions of the present application and not to limit the scope of patent protection. Those skilled in the art should understand that the technical solutions described above can be modified or replaced by equivalents without departing from the spirit and scope of the application, and all should be covered within the scope of the claims of the present application.​

Claims

1. An oxygen concentration sensor mounting structure for an anesthesia apparatus for mounting an oxygen concentration sensor to measure an oxygen concentration in a patient's inspiration; 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 guide 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 portion facing the first side wall, a second end portion opposite to the first end portion, 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 absence of the oxygen concentration sensor, the biasing force of the biasing spring pushes the push rod toward the sensor interface such that the blocking portion of the push rod abuts against the first end portion of the sensor interface to close the mounting through hole; and in the presence of the oxygen concentration sensor, a probe end portion of the oxygen concentration sensor extends into the chamber via the mounting through hole, pushing the blocking portion of the push rod away from the first end portion of the sensor interface.

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

3. The sensor mounting structure according to claim 2, characterized by The enlarged portion is sized to abut against the first end portion of the sensor interface in the absence of the oxygen concentration sensor.

4. The sensor mounting structure according to claim 2, characterized by The blocking portion further includes a seal ring carrier portion and a first seal ring disposed around an outer peripheral wall of the seal ring carrier portion, the seal ring carrier portion is sized to extend into the mounting through hole of the sensor interface such that the first seal ring is between an inner peripheral wall of the mounting through hole and an outer peripheral wall of the seal ring carrier portion and seals.

5. The sensor mounting structure according to claim 2, characterized by The mounting seat includes a barrel defining the guide hole therein, and a groove extending in a circumferential direction on an outer portion of the barrel; wherein an end portion of the coil spring toward the mounting seat is held in the groove.

6. The sensor mounting structure according to claim 1, characterized by The mounting seat is integrally formed with the first side wall of the chamber.

7. The sensor mounting structure according to claim 1, characterized by The second side wall of the chamber is detachable.

8. An oxygen concentration detection structure for an anesthesia machine, including the oxygen concentration sensor mounting structure according to any one of claims 1-7 and an oxygen concentration sensor detachably mounted to the oxygen concentration sensor mounting structure; wherein the second end portion of the sensor interface of the oxygen concentration sensor mounting structure extends to an outside of the second side wall, an internal thread is formed at the second end portion; the oxygen concentration sensor is formed with an external thread cooperating with the internal thread and a second seal ring is arranged on an outer peripheral wall thereof. 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 positioned between the inner circumferential wall of the mounting through-hole and the outer circumferential wall of the oxygen concentration sensor and seals.

9. A split breathing circuit structure for an anesthesia machine, comprising a circuit assembly including a 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 by itself but detachable between the integrated modules, each integrated module forming at least a portion of at least one functional component of a plurality of functional components required for a breathing circuit of the anesthesia machine; the plurality of integrated modules including at least a second integrated module forming at least a valve seat of an inspiratory check valve, a chamber for placement of an oxygen concentration sensor, and a connection port for connection with a first opening of a carbon dioxide absorption tube; a valve disc and a valve disc cover required for the inspiratory check valve being adapted to be placed from outside of the circuit housing and detachably connected to the valve seat of the inspiratory check valve; The split breathing circuit structure further comprises the 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 of claim 9.

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