WO2017063200A1

WO2017063200A1 - Expiratory end gas measurement system and gas sampling accessories

Info

Publication number: WO2017063200A1
Application number: PCT/CN2015/092134
Authority: WO
Inventors: 刘中华; 赵华琳; 周卫东; 涂有强; 官方勇
Original assignee: 深圳迈瑞生物医疗电子股份有限公司
Priority date: 2015-10-16
Filing date: 2015-10-16
Publication date: 2017-04-20
Also published as: CN107847706A; CN107847706B

Abstract

An expiratory end gas measurement system and gas sampling accessories (7). The expiratory end gas measurement system comprises a measurement host (2) and a gas passage switching device (1). The measurement host (2) comprises a signal processing circuit (21), a gas pump (221), and a gas measurement sensor (22), the signal processing circuit (21) being separately and electrically connected to the gas pump (221) and the gas measurement sensor (22). The gas passage switching device (1) comprises gas passage interfaces (12) and an identification module (11). The measurement host (2) is connected to different gas sampling accessories (7) by means of the gas passage interfaces (12), identifies the types of the gas sampling accessories (7) by means of the identification module (11), and controls the gas measurement sensor (22) by means of the signal processing circuit (21), thereby enabling the working mode of the expiratory end gas measurement system to be adjusted as the working modes of the gas sampling accessories (7). The expiratory end gas measurement system is simple to use and convenient to operate, and can meet various clinical applications by connecting various types of gas sampling accessories (7), thereby reducing the clinical cost.

Description

End-tidal gas measurement system and gas sample attachment technology

[0001] The present invention relates to the field of gas measurement, and more particularly to a respiratory end gas measurement system and a gas sampling accessory.

[0002]

BACKGROUND

[0004] The end-tidal gas measurement system is used to monitor the concentration or partial pressure of a gas exhaled by an organism, such as carbon dioxide, which is divided into a mainstream type and a bypass type. For bypass flow end-tidal gas measurement systems, one of the most common issues to consider when designing is: How to collect the condensate from the patient's exhaled gas that enters the environment after it enters the environment to prevent damage to the machine after it enters the measurement system.

[0005] The sidestream end-tidal gas measurement system uses a gas pump and a specific gas sampling line to take a very small amount of gas from the breathing circuit for measurement. The measured data can be used for respiratory support and respiratory management for anesthesia patients, icu, respiratory, etc. Provide clear indicators. The sidestream end-tidal gas measurement system is subdivided into a variety of equipment according to the size of the gas sampling flow. Commonly used equipment has a high-flow measuring system (between 70ml/min and 200ml/min) and a low-flow measuring system (50ml/min). ) Two.

[0006] In order to adapt to different application scenarios, or to consider clinical use costs, it is often necessary to purchase different devices for use, resulting in complicated use and inconvenient operation. Or simply use a single device (high-flow measurement system or low-flow measurement system), which can lead to problems in clinical application costs or in some cases.

[0007]

SUMMARY OF THE INVENTION

According to a first aspect, an embodiment of the present invention provides a respiratory end gas measurement system including a measurement host and a pneumatic circuit switching device;

[0010] the measurement host includes a signal processing circuit, an air pump, and a gas measurement sensor for measuring a gas parameter, the signal processing circuit being electrically connected to the air pump and the gas measurement sensor, respectively;

[0011] the pneumatic circuit switching device includes a gas path interface and an identification module, and the first end of the gas path interface is used for gas The body sampling accessories are connected, and the second end thereof is connected to the gas measuring sensor;

[0012] the identification module is configured to identify a type of a gas sampling accessory connected to the airway interface, and output identification information, the identification module being electrically connected to the signal processing circuit to transmit the identification information to the Signal processing circuit.

[0013] According to a second aspect, an embodiment provides a gas sampling accessory coupled to a end-tidal gas measurement system that includes a gas tube and a marking module for collecting gas from a breathing circuit, the marking module and gas sampling The type of accessory corresponds and the type information of the gas sampling accessory is communicated to the identification module at the gas sampling device connected to the end-of-breath gas measurement system.

[0014] According to the end-tidal gas measuring system and the gas sampling accessory of the above embodiment, since the measuring host connects different accessories through the airway interface on the pneumatic circuit switching device, and is identified by the identification module on the pneumatic circuit switching device a type of gas sampling accessory connected to the gas path interface, and after the identification, the gas measuring sensor is controlled by a signal processing circuit electrically connected to the identification module, so that the working mode of the end-tidal gas measuring system is adjusted to the working mode of the gas sampling accessory, Therefore, the end-tidal gas concentration measuring system is simple in use and convenient to operate, and can meet various clinical use scenarios by connecting various types of proprietary gas sampling accessories, thereby improving measurement performance and reducing clinical cost.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a block diagram showing the structure of a sidestream end-tidal gas measuring system in an embodiment of the present invention;

2 is an exploded perspective view of a sidestream end-tidal gas measuring system according to an embodiment of the present invention; [0019] FIG. 3 is a schematic view showing the assembled structure of the side-flowing end-tidal gas measuring system of FIG.

4 is a front elevational view showing the abutting surface of the air passage switching device according to an embodiment of the present invention; [0020] FIG.

5 is a front elevational view showing a mating surface of a high flow attachment and a low flow attachment in an embodiment of the present invention; [0021] FIG.

[0022] wherein, 1, the gas path switching device; 11, the identification module; 111, the recessed hole; 12, the gas path interface; 13, the table; 14, the fixed member; 141, the buckle is closed; ;

[0023] 221, an air pump;

[0024] 21, signal processing circuit; 210, processor; 220, memory; 211, high flow control module; 212, low flow control module; 224, signal amplification processing circuit; 225, A / D conversion circuit; [0025] 22. a gas measuring sensor; 222, a gas chamber; 223, an optical measuring component;

[0026] 3, high flow attachment; 31, first bump; 32, water collecting cup; 321, first protrusion; 33, first air tube

[0027] 4, low flow attachment; 41, second bump; 42, mounting cup; 421, cavity; 422, second protrusion; 4

3, the second air pipe; 44, moisture filter;

[0028] 7. Gas sampling accessory; 71. Type marking module.

[0029]

DETAILED DESCRIPTION

[0031] In order to more clearly understand the technical features, objects and effects of the present invention, a sidestream end-breath gas measuring system will be taken as an example, and a specific embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0032] As shown in FIGS. 1 to 5, the sidestream end-tidal gas measuring system includes a measuring host 2, a pneumatic circuit switching device 1 and a gas sampling accessory 7.

Referring to FIGS. 1 through 5, the measuring host 2 includes a signal processing circuit 21, a gas measuring sensor 22, and an air pump 221. The gas measuring sensor 22 is mainly used for measuring gas parameters, and the signal processing circuit 21 is electrically connected to the air pump 21 and the gas measuring sensor 22, respectively.

In a specific embodiment, the gas measuring sensor 22 includes a plenum 222 and an optical measuring component 223 for measuring the gas within the plenum 222, such as measuring the concentration of the gas. The measurement principle of gas concentration is generally based on non-dispersive infrared spectroscopy (NDIR), which uses the measured gas to absorb infrared light in a certain band, and selects the infrared light of the specific band to make it illuminate the gas. The gas sample in the chamber 222, the optical measuring member 223 generally includes a light emitting portion and a light receiving portion, and the light emitting portion and the light receiving portion are respectively disposed on opposite sides of the gas chamber 222. The light receiving unit converts the received optical signal into an electrical signal and outputs it to the signal processing circuit 21. Since the relationship between the amount of attenuation of the optical intensity of the optical measuring unit 223 and the concentration of the measured gas in the chamber 222 conforms to Beer-Lambert's law, the signal processing circuit 21 can calculate the concentration of the corresponding gas by measuring the amount of light attenuation.

The signal processing circuit 21 includes a processor 210, a memory 220, a signal amplification processing circuit 224, and an A/D conversion circuit 225. The input of the signal amplification processing circuit 224 is connected to the output of the optical measuring unit 223, and the signal amplification processing circuit 224 The output is connected to the input of the A/D conversion circuit 225, and the output of the A/D conversion circuit 225 is connected to the processor 210. The processor 210 is also connected to the memory 220 and the air pump 221, respectively, for the slave memory 2 The corresponding measurement module is loaded in 20 to control the bypass flow end gas measurement system to operate in the corresponding measurement mode, and to send corresponding control information to the air pump 221 to control the pumping rate of the air pump 221. In this embodiment, the measurement module may include a high flow control module 211 and a low flow control module 212. The processor 210 is further configured to calculate a gas parameter based on an electrical signal output by the optical measuring component 223.

[0036] The air pump 221 is disposed on the air passage that communicates with the air chamber 222 at the second end of the air passage interface 12 to control the magnitude of the gas sampling flow rate. It should be noted that the air passage structure between the second end of the pneumatic circuit port 12 and the air chamber 222 is optimized so that the sidestream end-breath gas concentration measuring system can be obtained with different gas sampling accessories 7 Measuring performance. In general, the optimized gas path structure is to reduce the dead space inside the host as much as possible, and to ensure the response speed as fast as possible. It can be understood that the selection of the air pump 221 is versatile. The air pump 221 in this embodiment preferably uses a small volume, high pumping rate adjustable air pump 221, and it is understood that other commonly used air pumps 221 are also Within the scope of protection of the present invention.

[0037] Referring to FIGS. 1 to 5, the pneumatic circuit switching device 1 includes a pneumatic circuit interface 12 and an identification module 11, the first end of which is connected to the gas sampling accessory 7, and the second end is connected to The gas chamber 222 of the gas measuring sensor 22 described above. The identification module 11 is configured to identify the type of the gas sampling accessory 7 connected to the pneumatic circuit interface 12, and output identification information, and the identification module 11 is electrically connected to the signal processing circuit 21 to transmit the identification information to the processor of the signal processing circuit 21. 210.

[0038] Referring again to FIGS. 1 through 5, the gas sampling accessory 7 may include a high flow attachment 3 and a low flow attachment 4. The high flow attachment 3 includes a first air tube 33, a water collecting cup 32 and a first type marking module. The first type marking module cooperates with the identification mode of the identification module 11, and the first air tube 33 passes through the air path interface 12 and the above gas measuring sensor. The 22 phases are connected, and the water collecting cup 32 is disposed on the first gas pipe 33 to collect moisture in the gas passing through the first gas pipe 33.

[0039] The low flow attachment 4 includes a second air tube 43, a moisture filter 44, and a second type of marking module. The second type of marking module cooperates with the identification mode of the identification module 11, and the second air tube 43 passes through the pneumatic interface 12 and The gas measuring sensor 22 is in communication with each other, and the moisture filter 44 is disposed on the second gas pipe 43 to collect moisture in the gas passing through the second gas pipe 43.

[0040] The air circuit switching device 1 and the gas sampling accessory 7 are docked, and the identification module 11 is located at the side of the gas circuit switching device 1 that is in contact with the gas sampling accessory 7 and the gas sampling device 7 1 docking with the gas sampling accessory 7, the type marking module 71 transmits the type information of the gas sampling accessory 7 to the identification module 11 The type marking module 71 can include the first type marking module and the second type marking module described above.

[0041] Specifically, the identification module 11 may include a plurality of contact switches, and a plurality of contacts are triggered when the gas path switching device 1 is connected to the gas sampling accessory 7 and are different through a plurality of contacts. A trigger position or combination of signals is used to identify whether the gas sampling accessory 7 connected to the pneumatic interface 12 is a high flow accessory 3 or a low flow accessory 4.

[0042] In general, the pneumatic circuit switching device 1 is disposed on the outer casing of the measuring host 2, and the pneumatic circuit switching device 1 can be mounted on the front panel of the measuring host 2, understandably, the pneumatic circuit switching device 1 Other mounting locations on the measuring host 2 are also within the scope of the present invention. As shown in Fig. 4, the housing may be provided with three recessed holes 111 arranged in an inverted triangle shape. It can be understood that the number and arrangement of the recesses 111 are various and are within the protection scope of the present invention. The interior of each recess 111 is correspondingly provided with a contact closure. The first type of marking module includes two first bumps 31 disposed on a side of the high flow attachment 3 that is in contact with the pneumatic circuit switching device 1. As shown in the left diagram of FIG. 5, each of the first bumps 31 corresponds to Inserted into a recess 111. The second type marking module includes two second bumps 41 disposed on a side of the low flow accessory 4 that is in contact with the air circuit switching device 1. As shown in the right figure of FIG. 5, each second bump 41 corresponds to Inserted into a recess 111. The first bump 31 and the second bump 41 can transmit different information by corresponding different recess holes 111, for example, the contact points of different positions are triggered by the first bump 31 and the second bump 41, respectively, or different The combined contact switches are respectively triggered by the first bump 31 and the second bump 41 to form different signal combinations, for example, when the first and second contacts are triggered, the air circuit switching device 1 is considered Connected to the high flow attachment 3, the first and third contacts are triggered, and it is considered that the pneumatic switching device 1 is connected to the low flow attachment 4.

[0043] The identification module 11 transmits the type information of the gas sampling accessory 7 to the processor 210, and the processor 210 reads the corresponding measurement module from the memory 220 according to the type information. When the air circuit switching device 1 is connected to the high flow accessory 3, the identification module 11 transmits the type information of the high flow accessory 3 to the processor 210, and the processor 210 reads the high flow control module 211 from the memory 220, and this The 吋 processor 210 controls the air pump 221 to operate at a high pumping rate, thereby controlling the measuring system to operate in the high flow measuring mode; when the pneumatic circuit switching device 1 is connected to the low flow accessory 4, the identification module 11 will be a low flow accessory 4 The type information is transmitted to the processor 210, the processor 210 reads the low flow control module 212 from the memory 220, and the processor 210 controls the air pump 221 to operate at a low pumping rate, thereby controlling the measurement system to operate at low flow measurement. mode. Compared with the prior art, this embodiment can automatically identify whether the user accesses a high-flow accessory or a low-flow accessory, It can adapt to different application scenarios without requiring users to perform complicated operations.

[0044] In addition, the first bump 31 and the second bump 41 can be inserted into the corresponding recessed holes 111 in addition to the type information of the gas sampling accessory, and can also facilitate the high flow attachment 3 and the low flow attachment. 4 the role of the installation.

[0045] In other embodiments, the identification module 11 may be a connector in addition to the contact closure. The connector is located on the side of the pneumatic circuit adapter 1 that is in contact with the gas sampling accessory 7 and is connected to the gas sampling accessory 7. Correspondingly, the type marking module is a connector plug; the connector is connected to the gas sampling device in the pneumatic circuit switching device 1 The attachment 7 is triggered and the type of gas sampling attachment 7 connected to the pneumatic interface 12 is identified by a different trigger position or combination of signals.

[0046] In some embodiments, the identification module 11 may further be at least one of an RFID identification module 11, a barcode scanner, a flow identification module, and a photoelectric recognition module 11. Correspondingly, the type marking module is an electronic label.

, bar code, flow sensor or light emitting module. The flow sensor automatically records the gas flow rate in the gas sampling accessory. When the process sensor is connected to the flow identification module, the flow identification module can directly determine the type of the gas sampling accessory 7 and report it to the processor 210. The light emitting module emits light of a specific spectrum. When the light emitting module is connected to the photoelectric recognition module, the photoelectric recognition module converts the received optical signal into an electrical signal and reports it to the processor 210 to determine the gas sampling accessory 7. Types of.

[0047] In some embodiments, the low flow attachment 4 may further include a mounting cup 42 that conforms to the shape and size of the water collecting cup 32. The mounting cup 42 is for connecting to one end of the second gas pipe 43 connected to the gas path interface 12. The function of the mounting cup 42 is to reduce the difference in the installation of the high-flow attachment 3 and the low-flow attachment 4, so that the above-described pneumatic switching device 1 is more adaptable, when the pneumatic switching device 1 is compatible with high-flow accessories 3 and low flow attachment 4吋, the structural design of the pneumatic circuit adapter 1 for both installations can be consistent.

[0048] Further, in order to expand the function of the mounting cup 42, the mounting cup 42 is further provided with a cavity 421 extending in the flow direction of the gas and having two ends boring, so that the moisture filter 44 is detachably mounted. Within the cavity 421. In general, the moisture filter 44 can be snapped into the cavity 421 by snapping. Considering that the moisture filter 44 has a certain increase in weight after absorbing water, the cavity 421 of the mounting cup 42 can provide a certain supporting effect, so that the stability of the above-mentioned low-flow attachment 4 is better.

[0049] In some embodiments, the above-described pneumatic circuit switching device 1 is configured for the connection of the high flow attachment 3 and the low flow attachment 4 The structure may include a pallet 13 for supporting the water collecting cup 32 and the mounting cup 42, and a fixing member 14 for fixing the water collecting cup 32 and the mounting cup 42 is further disposed above the pallet 13. The pallet 13 and the fixing member 14 constitute a pair of clamping members. When the high-flow attachment 3 and the low-flow attachment 4 respectively abut the pneumatic circuit adapter 1, the pallet 13 and the fixing member 14 can firmly hold the collecting cup 32 and the mounting cup 42 are clamped to ensure stability after docking installation.

[0050] Further, the top end of the fixing member 14 may be provided with a press-type snap switch 141, and the top of the water collecting cup 32 is provided with a first protrusion 321 that cooperates with the buckle clamp 141, and the mounting cup 42 The top is provided with a second protrusion 422 that cooperates with the snap switch 141.

[0051] In other embodiments, the gas sampling accessory may also be a mainstream sensor or other respiratory mechanics sensor.

[0052] In addition, the gas sampling accessory can be integrated with the measuring host and the pneumatic circuit switching device for sale as a set of measuring systems, or can be separately sold as an accessory and sold separately.

The present invention has been described with reference to the specific examples thereof, which are merely used to help the understanding of the invention and are not intended to limit the invention. Variations to the above specific embodiments may be made by those skilled in the art in light of the teachings of the present invention.

technical problem

Problem solution

Advantageous effects of the invention

Claims

Claim

[Claim 1] A respiratory end gas measuring system, comprising: a measuring host (2) and a pneumatic circuit switching device (1);

The measuring host (2) comprises a signal processing circuit (21), an air pump (221), and a gas measuring sensor (22) for measuring gas parameters, the signal processing circuit (21) and the air pump (221) respectively The gas measuring device (22) is electrically connected; the pneumatic circuit switching device (1) comprises a gas path interface (12) and an identification module (11), and the first end of the gas path interface (12) is used for Connected to the gas sampling accessory (7), the second end of which is connected to the gas measuring sensor (22);

The identification module (11) is for identifying a gas sampling accessory connected to the pneumatic interface (12)

The type of (7), and outputting identification information, the identification module (11) being electrically connected to the signal processing circuit (21) to transmit the identification information to the signal processing circuit (21).

[Claim 2] The end-tidal gas measuring system according to claim 1, further comprising a gas sampling accessory (7) comprising a high flow accessory (3) and a low flow accessory (4);

The high flow attachment (3) includes a first air pipe (33), a water collecting cup (32) and a first type marking module, and the first type marking module cooperates with the identification mode of the identification module (11). The first air pipe (33) communicates with the gas measuring sensor (22) through the air passage interface (12), and the water collecting cup (32) is disposed on the first air pipe (33) to collect the passing passage The moisture in the gas of the first gas pipe (33);

The low flow accessory (4) includes a second air pipe (43), a moisture filter (44) and a second type marking module, the second type marking module being matched with the identification mode of the identification module (11), The second air pipe (43) is in communication with the gas measuring sensor (22) through the air passage interface (12), and the moisture filter (44) is disposed on the second air pipe (43) for collecting Moisture in the gas passing through the second gas pipe (43).

[Claim 3] The end-tidal gas measuring system according to claim 1 or 2, wherein the identification module (11) comprises a plurality of contacts, at least one of which is closed to the gas path Turn The connection device (1) is connected to the gas sampling accessory (7), and is triggered by a plurality of the contacts to identify different connection positions or signal combinations to identify the connection with the pneumatic interface (12) The type of gas sampling accessory (7).

[Claim 4] The end-tidal gas measuring system according to claim 3, wherein the measuring host (2) further comprises a casing, and the pneumatic circuit switching device (1) is disposed on the casing; The identification module (11) is located on a side of the gas path switching device (1) that is in contact with the gas sampling accessory (7) and is connected to the gas sampling accessory (7).

[Claim 5] The end-tidal gas measuring system according to claim 4, wherein the outer casing is provided with a plurality of concave holes (111), and corresponding ones of the inner sides of the concave holes (111) One of the contacts is closed, and a side of the gas sampling attachment (7) that is in contact with the pneumatic switching device (1) is provided with a bump (31) that can be inserted into the recess (111). The position and number of the bumps (31) on the gas sampling accessory (7) correspond to their types.

[Claim 6] The end-tidal gas measuring system according to claim 2, wherein the pneumatic circuit switching device (1) further comprises a pallet (13) for supporting the water collecting cup (32) a fixing member for fixing the water collecting cup (32) is further disposed above the pallet (13) (the top end of the fixing member (14) is provided with a pressing type buckle (141), The top of the water collecting cup (32) is provided with a first protrusion (321) that cooperates with the buckle (141).

[7] The end-tidal gas measuring system according to claim 6, wherein the low-flow attachment (4) further includes a mounting cup (4 2) that conforms to the shape and size of the water collecting cup (32). The mounting cup (42) is provided with a cavity (421) extending in the flow direction of the gas and having bores at both ends, and one end of the moisture filter (44) is detachably coupled to the second air tube ( 43) The other end of the connection is detachably mounted in the cavity (421) and connected to the pneumatic interface (12) through the cavity (421).

[8] The end-tidal gas measuring system according to claim 7, wherein the top of the mounting cup (42) is provided with a second protrusion that cooperates with the snap-off (141) (4 twenty two) .

[9] The end-tidal gas measuring system according to claim 1, wherein the signal processing circuit (21) includes a processor (210) and a memory (220), and the identification module

(11) electrically connected to the processor (210), the processor (210) loading a corresponding measurement module from the memory (220) according to the identification information to control the operation of the sidestream end-tidal gas measurement system In the corresponding measurement mode, and corresponding control information is sent to the air pump (221) to control the pumping rate of the air pump (221).

[Claim 10] The end-tidal gas measurement system according to claim 9, wherein the measurement module comprises a high flow control module (211) and a low flow control module (212).

[Claim 11] The end-tidal gas measuring system according to claim 1, wherein the gas measuring sensor (22) comprises a gas chamber (222) and an optical measuring member (223); the gas path interface ( A second end of 12) is coupled to the plenum (222) for measuring gas in the plenum (222).

[Claim 12] The end-tidal gas measuring system according to claim 1, wherein the identification module (11) is a contact switch or a connector, and the identification module (11) is located at the gas path The transfer device (1) is connected to the gas sampling accessory (7) and the gas sampling accessory

(7) the side of the contact; the identification module (11) is triggered when the gas path switching device (1) is connected to the gas sampling accessory (7), and through different trigger positions or signal combinations, The type of the gas sampling accessory (7) connected to the pneumatic circuit interface (12) is identified.

[Claim 13] The end-tidal gas measuring system according to claim 1, wherein the identification module (11) is at least one of an _RFID identification module, a barcode scanner, a flow identification module, and a photoelectric recognition module.

[Claim 14] The end-tidal gas measuring system according to claim 2, wherein the first type marking module is at least one of an electronic label, a barcode, a flow sensor, and a light emitting module; The marking module is at least one of an electronic tag, a barcode, a flow sensor, and a light emitting module.

[Claim 15] A gas sampling accessory coupled to a end-tidal gas measurement system, comprising: a gas tube and a marking module for collecting gas from a breathing circuit, the marking module corresponding to a type of gas sampling accessory, And the gas sampling device (1) connected to the end-tidal gas measuring system of the gas sampling accessory transmits the type information of the gas sampling accessory to the identification module (11).

[Claim 16] The gas sampling accessory according to claim 15, wherein the marking module transmits type information of the gas sampling accessory to the identification module (11) by triggering or connecting at different positions or different combinations, The type information of the gas sampling accessory is transmitted to the identification module (11) by means of information scanning or radio frequency identification.

[Claim 17] The gas sampling accessory of claim 15, comprising a high flow accessory

(3) or low flow attachment (4);

The high flow attachment (3) includes a first air pipe (33), a water collecting cup (32) and a first type marking module, and the first type marking module cooperates with the identification mode of the identification module (11). The first air pipe (33) is for communicating with the gas measuring sensor (22) through the pneumatic circuit interface (12), and the water collecting cup (32) is disposed on the first air pipe (33) to collect through the first The moisture in the gas of a trachea (33);

The low flow accessory (4) includes a second air pipe (43), a moisture filter (44) and a second type marking module, the second type marking module being matched with the identification mode of the identification module (11), The second air pipe (43) is for communicating with a gas measuring sensor (22) through a pneumatic circuit interface (12), and the moisture filter (44) is disposed on the second air pipe (43) to collect a passage The moisture in the gas of the second gas pipe (43).

[Claim 18] The gas sampling accessory of claim 17, wherein the low flow accessory

(4) further comprising a mounting cup (42) conforming to the shape and size of the water collecting cup (32), the mounting cup (42) for connecting to the second gas pipe (43) and the gas path interface (12) One end of the connection.