JPS5899971A - Breathing circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

■ Background of the Invention Technical Field The present invention relates to a drainage circuit. Prior art and its problems As a breathing circuit, there is a circuit used by connecting a resurvirator (also called a ventilator) to perform artificial respiration, and a circuit used to administer anesthetic gas and oxygen gas to the patient. The circuits used by lumberjacks include circuits for anesthesia, and circuits for inhalation therapy that administer drugs and acid: IA. These various breathing circuits basically consist of an inspiratory inlet tube that connects a rebuilder, an anesthesia machine, etc., a patient's tracheal catheter, a ROMask, etc., and an expiratory outlet tube. As one of the conventionally used breathing circuits, for example, the first
There is something like the one shown in the figure. This circuit connects the intake air intake pipe (■) to the air supply side of the resurvirator R via the heating humidifier H (Vcl), and connects the exhalation exhaust pipe (E) to the ventilation @.
Both are connected to a Y-shaped connector (4 connections, connected to the patient's tracheal force puller, etc.), and the end of the intake tube l.
A nebulizer 6 is inserted for inhaling medicines such as medicaments, bronchodilators, and sputum dissolvers into the respiratory tract as aerosols, and an exhalation valve 7 is inserted in the middle of the exhalation discharge pipe E. However, in such a circuit, the intake air introduction pipe (1) and the expiration air outlet pipe (E) are separate, so the overall size is large and it is inconvenient to handle. In addition, the intake gas is heated and humidified by the heating humidifier 14 before being sent, but while passing through the intake air introduction pipe I, heat loss causes a! The temperature drops and it is difficult to provide the patient with the desired temperature and fluids. In this case, in order to provide the patient with inspiratory gas at an appropriate temperature, it is sufficient to send gas heated to a considerably high temperature using the humidifier H, but at this time, a large amount of condensed water is generated in the pipes, and the water must be drained frequently. Moreover, there is a high risk that the patient will inhale hot gas due to some kind of trouble. Furthermore, there are two tubes near the patient's mouth via connector C, so when monitoring the internal pressure of one circuit or the temperature of inhaled gas near the patient's mouth, various devices are required.
The structure near the mouth becomes extremely complex, extremely unpleasant for the patient, and difficult to handle. On the other hand, as a breathing circuit mainly used for anesthesia, a pain circuit or an F circuit as shown in FIG. 2, for example, is known. Such a circuit consists of, for example, a straight inner tube 15 and a normally bellows-shaped outer tube 11, which are arranged coaxially to form a double tube 1, and an intake circuit and an outer tube are connected inside the inner bone 15. ll inner tube 15
The space in between is the exhalation circuit. Then, one end of the double tube 1 on the patient side is connected to a connector 3 having an air supply/exhaust port 31. The other ends of the outer tube 11 and the inner tube 15 on the anesthesia machine A side are attached to the base body 5, respectively, and air is supplied from the anesthesia machine A through the inner tube communication hole 53 and the outer tube communication hole 51 of the base body 5. Provide ventilation. Since such a circuit uses a double pipe, it is easy to handle, and if such a circuit is used, compared to the case where the intake pipe I and the expiration pipe E are provided as independent pipes as described above, Since the outer tube 11 exists outside the inner tube 15 as an intake circuit, and the exhaled gas comes into contact with the outer periphery of the inner tube 15, the heat loss of the intake gas is reduced. However, such a circuit does not include an exhalation valve or a nebulizer, and since it uses a double tube, it is not possible to insert these in the middle, which limits the number of respiratory ventilators that can be used. It has the disadvantage of being In view of these circumstances, the Ministry of the Invention has previously developed a breathing circuit as shown in Figures 3 and 4 as a breathing circuit that eliminates these various inconveniences. This circuit is provided with an outer tube 11, 11' and an iser 6 and an exhalation valve 7 as described above. In this case, the connecting portion 2' includes the outer tube body 21' and the inner tube body 21'.
2'. In the middle of this lotus joint part 2', an outer pipe body 21' of the connecting part 2' is connected so that it communicates only with the inner pipe body 22' that connects with the inner pipe 15, 15' for intake air introduction. A nebulizer 6 is arranged so as to shut it off. Further, an exhalation valve 7 is provided on the outer tube body 21' connected to the outer tube 15, 15' for exhaling exhaled air, and the exhalation valve 7 is connected to the outer tube 15.
A side passage 27' is provided between the outer tubular body 21' and the exhalation valve 7 so as to bypass the exhalation valve 7. In addition, in the figure, connector 3 is connected to double tube 1 on the patient side.
and connector C5 are attached, and on the resurvirator side, f knee 7'T for feed 'A' and connector C1 are attached.
A base body 5 with a ventilation tube T is connected thereto. According to the circuit according to such an earlier proposal, the above, however,
Such a circuit also has the disadvantage of high expiratory and inspiratory resistance, and to reduce these, the tube dimensions must be increased, reducing compactness. I. Purpose of the Invention The present invention was developed in view of the above-mentioned circumstances, and its main purpose is to have a single, compact structure, easy handling, low heat loss, and low moisture content due to condensation. The object of the present invention is to provide a highly versatile breathing circuit for a resurvirator, which has low resistance to exhalation and inhalation, and is equipped with a nebulizer and an exhalation valve. For this purpose, the inventor conducted a thorough examination of the elbow and found 5
The present invention has been accomplished. That is, the present invention has a double tube composed of an outer tube and an inner tube, and one end K of the double tube on the patient side. A connector provided with an air supply/exhaust port is connected, and the other end of the double tube is connected to a connecting portion having a nebulizer and an exhalation valve, and the nebulizer is connected to the outer tube and the inner tube at the connecting portion. connecting one of the exhalation valves to the other of the outer tube and the inner tube, and connecting an inhalation introduction tube to a connecting port portion of the connecting portion that communicates with a nebulizer;
Moreover, an exhalation discharge pipe is connected to the connection port communicating with the exhalation valve of the connection part.

This is a breathing circuit characterized by the following. The embodiments of the present invention relate to specific structures for more effectively realizing the above-mentioned objects, and are as follows. i) A breathing circuit according to the present invention, in which the exhalation discharge pipe and the suction introduction pipe are bellows pipes. This improves safety and ease of handling. ji) The breathing circuit of the present invention or i) above, wherein the outer pipe constituting the double pipe is an expiratory pipe and the inner pipe is an inhalation pipe. At this time, heat loss occurs and becomes extremely small.・i) The connecting part consists of an outer tube body and an inner tube body
The cylindrical system is also provided with a nebulizer so as to communicate with the inner flange tube of the double section, and a traditional mouth section that communicates with the nebulizer, and the outer flange tube of the ii section &
C. An exhalation valve is provided for slow communication, and a connection port communicating with the exhalation valve is provided, and a part of the outer pipe body and the inner @ pipe body of the two connecting parts are provided. ,Each,
The breathing circuit of ii) above, in which the outer tube and the inner tube are connected. When , the structure becomes extremely simple. iv) The breathing circuit of the present invention or any one of i) to i) above, wherein the outer tube constituting the double tube is a bellows tube.
``At this time, safety and ease of handling are improved. ■) Exhalation discharge ☆ is connected. The breathing circuit according to the present invention or any one of 1) to iv) above, wherein the connection and the mouth portion are detachably connectable to the exhalation valve. At this time, it becomes useful as a circuit for inhalation therapy. ■The connector has an outer tube attachment port and an inner tube attachment port that communicate with the supply/exhaust port, respectively, and the outer tube and inner tube of the double pipe are connected to the outer tube attachment port and the inner tube attachment port, respectively. The breathing circuit according to the present invention or any one of l) to V) above. At this time, the amount of mechanical dead space associated with the elongation of the circuit decreases. (2) Specific Structure of the Invention The present invention will now be described in detail with reference to the embodiments shown in FIGS. 5 to 8. The breathing circuit of the present invention has a double tube 1 composed of an outer tube 11 and an inner tube 15. To construct a double pipe from the outer pipe 11 and the inner pipe 15, as shown in the figure,
1 and the inner tube 15 are arranged coaxially. In this case, if the inner pipe 15 is used as an intake pipe and the outer pipe 11 is used as an exhalation pipe, the inside of the inner pipe 15 is used as an intake circuit, and the space between the outer pipe 1 and the inner pipe 15 is used as an exhalation circuit, thereby reducing heat loss of the intake gas. , obtain favorable results. The outer tube 11 used is preferably a bellows tube. This is because kinking, that is, damage to the circuit due to twisting or bending, is reduced. On the other hand, the inner tube 15 has a small diameter and is less prone to kinking, so it may be a bellows tube or a straight tube. The materials constituting the outer tube 11 and the inner tube 15 used may be the same or different, and may be made of known flexible f-knee 7' materials, such as polyethylene, poly-10-pyrene, polyamide,
It may be appropriately selected from polyvinyl chloride, polyester, polyurethane, polyvinyl acetate, and the like. Further, the dimensions of the inner tube 15 and the outer tube 11 can also be changed depending on the woodcutter. In this case, the inner diameters of the inner tube 15 and outer tube 11 are: The angles may be approximately 8 to 20 degrees and 20 to 30 degrees, respectively, and the ratio thereof may be approximately 1:1.5 to 1:25. Furthermore, when using a bellows tube, the difference between the outer diameter of the peak and the outer diameter of the valley is:
The radius of curvature of the top of the bellows should be approximately 0.5 to 1.5. Furthermore, the average thickness of the two should be approximately the same. They may be the same or different, but usually they should be about 0.3 to 1 cm long.The length should be about 303 to 90 m.The inner pipe 15 used in this way and the force t that can be applied to the outer tube 11, when the pressure inside the circuit is increased, the elongation of the circuit is small, the amount of mechanical dead space is small, and even if the airway resistance fluctuates, the dead space remains If the ventilation volume does not change and there is no need to adjust the ventilation volume (&1 on a score of 5), it is preferable to configure the inner tube with a material that has a lower elongation rate than the outer tube. In this example, the outer diameter W11 is a bellows tube and the inner tube 1115 is a straight tube. There is an equal force t that makes the radius of curvature of the bellows top of the inner tube smaller than that of the outer tube 74% of that of the outer tube. if,
Heat loss is even less, giving favorable results. The bent end 1 of the double pipe 1 constructed in this way is connected to the connector 3. As shown in FIGS. 8(a) to (C)K, the connector 3 may have an air supply/exhaust port 31'4-, and one end of the double tube l on the patient side communicates with it.・For this reason, the connector 3 generally has at least the outer tube 1.
1o) One end is provided with an outer pipe attachment port 33 that can be fitted into the pipe and communicates with the above-mentioned supply/exhaust port 31. That is, the end 1#5 of the patient-side end of the double tube 1 may be placed in the tube 9 and the lid 3 without being fixed therein. However, if the inner tube 15 located at one end of the double tube 1 on the patient side can also be fitted and fixed into the connector 3, the elongation of the circuit due to the increase in the pressure inside the circuit during inspiration will be reduced, and the mechanical dead space will be reduced. This is preferable in terms of reducing force. Examples of this are shown in FIGS. 8(a)-(C)K. In the same figure, the connector 3 has an outer tube attachment port 33 at the tip and an air supply/exhaust port 31 at the rear end. The pipe attachment port 34 and the outer tube attachment port 33 are connected by four blades 36, which are integrally molded from synthetic resin or the like. In the example shown in FIG. 1, the connector 3- is connected to the monitor hole 38.
A pressure monitoring tube 381 shown in FIG. 5 is attached so that the circuit internal pressure, intake air temperature, etc. can be monitored. On the other hand, the other end of the double pipe 1 is connected to the connecting part 2. The connecting part 2 includes a nebulizer 6 and an exhalation valve 7. In the connecting part 2, the nebulizer 6 communicates with one 6 of the outer tube 11 and the inner tube 15 connected to the connecting part 2,
Moreover, a connection port 2 for connecting an intake introduction pipe 5 to be described later.
It is provided so as to communicate with 7. In addition, the intake valve 7 is arranged so as to communicate only with the other of the outer pipe 11 and inner pipe 15 that are connected, and moreover, to communicate with a connection port 26 for connecting an exhalation discharge pipe 4, which will be described later. . Various structures are possible for this arrangement, but
In order to make the structure extremely simple and compact, the connecting part 2 has a double part 21 consisting of an outer pipe body 211 and an inner pipe body 215, as shown in FIGS. The inner tube of the double tube 1 can be fitted to the patient side end of the inner tube body 215, and
A nebulizer 6 is disposed at the other end, and a tubular connection port 27 is connected to the nebulizer 6, while an exhalation valve 7 is provided in the outer tubular body 211 and communicated therewith, and a tubular connection port 27 is connected to the exhalation valve 7. It is preferable that the connection port 26 be provided in communication with each other. In such a case, the communication space between the inner tubular body 215, the nebulizer 6, and the connection port 27 constitutes an inhalation circuit, and the communication space between the outer tube 211, the exhalation valve 7, and the connection port 26, which is separated from this, constitutes an inhalation circuit. Configure the intake circuit. The nebulizer 6 used may be a so-called ultrasonic nebulizer that generates an aerosol using ultrasonic waves, but in general, the aerosol is generated using the Venturi effect. It is preferable to use a so-called Venturi type nebulizer. Venturi-type nebulizers are usually installed in the intake circuit (
A container 61 is inserted and connected, and a nozzle 62 is provided inside this container 61. A jet stream is allowed to flow into this nozzle 62 from the outside through a tube 69 during exhalation. On the other hand, the container 61 is filled with a medicine liquid 64, and a suction pipe 65 is arranged at the bottom of the container 61, and an injection nozzle 6 is arranged at the bottom of the container 61.
3 is communicated with this suction pipe 65, and the injection nozzle 63 is connected to the normal nozzle 62 near the nozzle 62.
Place it at right angles to the - With this configuration, when the jet airflow is directed from the nozzle 62 into the container 61, the jet airflow creates a positive pressure at the mouth of the injection nozzle 63, and the drug solution flows into the suction tube 6.
5 and is aerosolized from a nozzle 63. In the illustrated case, the inner bottom surface of the container bottom 612 has a conical shape, so that a desired amount of the medicinal solution can be sucked up without waste. Further, the drug solution aerosolized from the injection nozzle 63 hits the baffle 68 together with the jet stream and is further scattered, thereby making the particle size uniform. In such a nebulizer 6, a connection port part 27 is integrally connected to the opposite side of the double part 21 which is integrally connected. - On the other hand, the exhalation valve 7 is preferably of a diaphragm type in terms of ease of handling. A preferred example of the exhalation valve 7 is shown in FIG. In this case, the exhalation valve 7 is connected to the connecting part 2. A cylindrical inlet s formed integrally with the outer tube body 211 of the double part 21 of
72, and an outlet part 73 which is integrally arranged concentrically with the population i1$72 and connected to the connection port part 26, the inside of the inlet part 72 forms an inlet 1i1721, and the space between the exit 1173 and the population part 72 forms an exit chamber 731. . On the other hand, the outlet section 73 includes a lid 74 having the pressurizing lower 5 and an outlet chamber 731. It is separated from the inlet chamber 721 by a diaphragm 71. With this configuration, if the pressure lower 5 also pressurizes the compartment 741 during intake via the tube 79, the diaphragm 7
1 is pressed against the population [72, the valve closes, and when the pressure in the compartment 741 is released during exhalation, the diaphragm 71 opens and the valve opens. If the pressure is released to a predetermined positive pressure (for example, s, t(,0) during expiration, PEEP therapy can be applied to reduce the risk of alveolar collapse, etc.). The exhalation valve 7 is bent, for example, into an L-shape, and a connection port 26 is integrally connected to the exhalation valve 7. In the example shown in FIG. A handle 28 for lowering is provided. The connection port portions 26 and 27 of such a connecting portion 2 are connected to the exhalation exhaust pipe 4 and the intake air introduction pipe 5, respectively. The exhalation exhaust pipe 4 and the intake air introduction pipe 115 Although it is preferable to use bellows tubes for both to prevent kinking traps and crushing, there is no particular restriction other than that. They can be made of normal materials and dimensions.The length is generally 601 to 120 m.
@It is considered strict. The exhalation discharge pipe 4 and the intake intake pipe 5 are respectively connected to the connection part 2 through the connection ports 26 and 27, but the exhalation discharge pipe 4 is always connected to the connection port 26. In addition, it is preferable that the exhalation valve protrusion of the connection port 26 be able to be connected to the exhalation valve 7 in a detachable manner. That is, as shown in FIG.
6, and the socket 26'
It is preferable that the connection port portion 26 and the connection port portion 26 be connectable by fitting. By applying pressure in this way, the connection port 26 to which the exhalation discharge pipe 4 is connected can be detachably connected to the exhalation valve 7, so that when the exhalation discharge pipe 4 is removed from the exhalation valve 7, an exhalation needle is not required. It can be used as a circuit for inhalation therapy that does not require a respirator, and a small exhalation needle can be connected to the exhalation valve 7, so it can also be used in resurvirators that do not have an exhalation needle inside the resurvirator. This allows for excellent versatility and a simple structure. ■Specific Function of the Invention When performing mechanical ventilation or inhalation therapy using the breathing circuit of the present invention, for example, connectors C6 and Cwa are connected to the exhalation discharge pipe 4 and the inhalation introduction pipe 5, respectively. Alternatively, if necessary, the exhalation discharge pipe 4 is removed from the exhalation valve 7 of the connecting portion 2, and connected to a resurvirator k, an anesthesia machine, etc. via a heating humidifier, an exhalation flowmeter, or the like. Further, an L-shaped connector C6, for example, is connected to the connector 3, and connected to a tracheal catheter, a ROMask, etc. on the patient side. In this way, the inspiratory gas sent from the resurvirator or anesthesia machine passes through the inspiratory introduction pipe 5, passes through the nebulizer 6, and is sent to the patient from inside v15. In addition, the exhaled gas from the patient is the inner tube t#t15 and the outer tube 1]
After passing through the exhalation valve 7, it enters, for example, an exhalation discharge pipe 4 and is discharged. ■Specific Effects of the Invention The breathing circuit of the present invention has an extremely simple and compact structure as a whole. In particular, the area near the patient's mouth has a double tube structure, so handling is extremely simple.
Also, since the exhalation valve 7 and the nebulizer 6 are separated, there is no need to worry about the types and specifications of the respirator, etc. that can be used. Since it has a tubular structure, there is less heat loss. Therefore, the IM temperature of the intake gas can be lowered, the amount of water stored in the circuit is reduced, and the risk of the patient inhaling high humidity gas is reduced. In addition to exhibiting these excellent effects, in the present invention, since the double pipe structure is provided only between the connecting portion and the μ person, the effect of reducing inhalation and exhalation resistance is achieved. In this case, as is clear from the experimental examples described later, when compared to the case where all the connections between the patient and the resurvirator have a double-pipe structure, the inspiratory and expiratory resistances are reduced while maintaining the same small heat loss. In addition, the pipe diameter exhibiting the same inspiratory and expiratory resistance becomes markedly smaller, achieving the effect that the double pipe 1 becomes more compact.Furthermore, according to embodiment i) K described above, exhalation discharge If both the tube and the intake inlet tube are made of bellows, there will be less kinking and crushing, and safety and ease of fitting and handling will be improved.According to embodiment ii), the outer tube of the double tube is used as the exhalation tube, If the inner pipe is an intake pipe, it is extremely advantageous in terms of heat loss.According to embodiment i), if the connecting part is provided with two parts as shown in FIG. 7, the structure becomes extremely simple. According to the actual ytt+aspect iv), if the outer tube is a bellows tube,
There will be less crushing due to kinking. According to the embodiment, the connection port to which the exhalation discharge pipe is connected is 1. If it can be detachably connected to the exhalation valve, when the exhalation discharge pipe is removed from the exhalation valve, it can be used as a circuit for inhalation therapy that does not require an exhalation needle, and it can also be used as a circuit for inhalation therapy that does not require an exhalation needle. It is now possible to connect a resurvirator, and it can also be used with resurvirators that do not have an expiratory needle inside, increasing versatility.
The overall structure is also extremely simple. According to embodiment vi), when the connector is connected to the outer pipe and the inner pipe, the amount of mechanical dead space due to elongation of the circuit is reduced,
Get more favorable results. Various experiments were conducted to confirm the effects of the present invention. An example is shown below. Experimental Example Comparative circuits of three woodcutter shown in Fig. 1 (Comparison 1 below), Fig. 2 (Comparison 2 below), Fig. 3 and Fig. 4 (Comparison 3 below) and the following shown in Figs. 5 to 8ai1. A circuit according to the present invention was prepared, one end of which was connected to a resurvirator via a heating humidifier, and the other end was connected to a temperature of 37°C and a relative humidity of 100°C.
% and the characteristics of each circuit were evaluated. In this case, in the breathing circuit of the present invention shown in FIGS. 5 to 8, the inner tube 15 constituting the double tube L used has a sieve with an inner diameter of 13.5 m at the valley part, an inner diameter of 15-1 at the peak part, and a total length of 60 m. A bellows tube made of polyethylene of
A polyethylene bellows tube with an inner diameter of 3.5 mm and a peak inner diameter of 28 mm was used. In addition, as the exhalation discharge pipe 4 and the intake intake pipe 5, each having a double-pipe structure, a bellows tube made of polyethylene of 60 mm is used, with an inner diameter of 23.5-1 at the trough and an inner diameter of 28 cm at the peak. there was. On the other hand, each comparison breathing circuit shown in FIGS. 1, 2, 3IQ, and 4 (Comparison 1.2
．． In 3), the outer tube and inner tube when forming a double tube, and each tube when forming a double tube structure, are as follows:
Corresponds to each. The cross-sectional dimensions of the tube were the same as those of the tube in the breathing circuit according to the present invention described above. Also,
In each of these three types of comparative breathing circuits, the total length of the tube portion was 1203 mm, which was made to match that of the above-mentioned breathing circuit belonging to the present invention. For each of the four types of breathing circuits of the present invention or for comparison as described above, each of the respiratory circuits was heated and humidified with a heating humidifier while inhaled gas was heated and humidified under the conditions shown in Table IK below. The turret was operated for 2 hours. The temperature (°C) at the mouth of the simulated coagulation lung after operating the resurvirator for 2 hours is shown below. Shown in l. Further, the amount of water stored in the circuit per unit volume (f/11/) after operating the resurvirator for 2 hours was measured. The results are shown in Table 1K below. In this case, except for Comparison 2 as shown in FIG. 2, the amount of stored water was measured separately between the heating/warming device connection section and the connection section mock-condensation tube. The results are shown below. Furthermore, for each of the four types of breathing circuits listed above, the flow rate was set to 3.
Expiratory resistance (ffL. H, 0/t/sec) and inspiratory resistance (mn H
20/L/sec). The results are also shown in Table IK below. From the results shown in Table IK, it can be seen that the circuit of the present invention is comprehensively superior.

[Brief explanation of the drawing]

@Figure 1 and Figure 2 are schematic diagrams for explaining conventional breathing circuits, respectively. Figures 3 and 4 are diagrams for explaining the breathing circuit previously proposed by the present inventor, of which Figure 3 is a front view and Figure 4 is a partially enlarged plan view of Figure 3a. be. 5 to 8 are diagrams for explaining the present invention in detail. Among these, FIG. 5 is a front view showing the state 11 before assembly, partially in cross section, and FIG. The figure is a plan view of Fig. 15 showing a part in cross section, Fig. 7 is an enlarged sectional view of the connecting part, and Fig. 8
Figure (a) is a front view showing a part of the connector in cross section.
Figure (b) is a left side view of No. 8 IQ (a), and Figure 8 (C) is a left side view of No. 8 IQ (a).
It is a diagram showing a half of the cross section when rotated by 5 degrees. 1...Double pipe, 11...Outer pipe, 1
5... Inner tube. 2...Series connection part, 21-...Double part, 211
...Outer pipe body 215...Inner pipe body, 2
6.27...Connection port, 3-------Connector, 31...Intake/exhaust port, 33...Outer tube installation port, 34...・・Inner pipe installation port, 6・・・・−・
Nebulizer, 7.---Exhalation valve. Patent Applicant Terumo Corporation Representative Patent Attorney Yo Ishii - Off Figure 'A-8 Figure (b) Figure 18 (0) JI) Age 8 Figure (C)

Claims (1)

[Claims] 1. A double tube comprising an outer tube and an inner tube, a connector provided with an air supply and exhaust port is connected to one end of the double tube on the patient side, and Connecting the other end of the tube to a connection comprising a nebulizer and an exhalation valve, at which the nebulizer is connected to one of the outer tube and the inner tube, and the exhalation valve is connected to the connection. An intake pipe is connected to the other of the outer pipe and the inner pipe, and an intake pipe is connected to the connection port of the connection part that communicates with the nebulizer, and an exhalation discharge pipe is connected to the connection port of the connection part that communicates with the exhalation valve. A breathing circuit that connects tubes and removes mold. 2. The breathing circuit according to claim 1, wherein the exhalation discharge pipe and the intake intake pipe are bellows pipes. 3. The breathing circuit according to claim 1 or i42, wherein the Kigai U constituting the double pipe is an exhalation pipe, and the inner pipe is an intake pipe. 4. The connecting part has a double part consisting of an outer pipe body and an inner pipe body, and a nebulizer is provided so as to communicate with the inner pipe body of the double part, and the nebulizer is connected to communicate with the nine parts. A mouth portion is provided, and an outer gA of the double portion is provided.
An exhalation valve is provided so as to communicate with the pipe body, and an ikt opening part is provided that communicates with the exhalation valve, and further, an exhalation valve is provided at the ends of the outer pipe body and the inner pipe body of the double part of the connecting part, respectively. , Claim #! where the outer tube and the inner tube are connected! The breathing circuit according to item 3. 5. The breathing circuit according to any one of claims 1 to ag4, wherein the outer tube constituting the double tube is a bellows tube. 6. The breathing circuit according to any one of claims 1 to 5, wherein the connection port to which the exhalation discharge pipe is connected can be detachably connected to the exhalation valve. 7. The connector has an outer tube attachment port and an inner tube attachment port that communicate with the supply/exhaust port, respectively, and the outer tube and inner tube of the double pipe are connected to the outer tube attachment port and the inner tube attachment port, respectively. A breathing circuit according to any one of claims 1 to 6.