JP2004283329A - Artificial respiration system and tracheal cannula - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an artificial respiration system and a tracheal cannula wherein respiration is possible even during sucking phlegm, a structure is simple, a cost is low, and a fault is hardly caused, and there is no fear of pushing back the phlegm into the tracheae due to blowing from a nartificial respirator. <P>SOLUTION: Since a suction catheter 15 is fixed to the tracheal cannula 14 so as to always suck the phlegm according to need, a time for taking out the adapter of a respiration tube and inserting the respiration tube into the tracheal cannula during this to suck out the phlegm as performed in the conventional artificial respiration system, is omitted. In addition, since the structure is simpler than the conventional artificial respiration system provided with an adapter for both of artificial respiration and suction, the costs are reduced and a fault hardly occurs. Since a respiration path 14a and a phlegm suction path 15a are disposed separately from each other in the tracheal cannula 14, there is no fear of pushing back the phlegm left in the tracheal cannula 14 into the tracheae 13 due to blowing from the respirator 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an artificial respiration system and a tracheal cannula, and more particularly to an artificial respiration technique performed through a hole formed in the trachea by tracheostomy.
[0002]
[Prior art]
In order to secure the patient's breathing, a tracheal cannula is inserted into the incised trachea, and the tracheal cannula is connected to the respiratory tract extending from the ventilator via the adapter unit via the adapter, so that artificial respiration using the ventilator Techniques for breathing have been developed. In artificial respiration, sputum accumulated in the trachea obstructs the respiratory tract.
In a commonly used method for treating sputum, a caregiver removes the adapter from the tracheal cannula, and then inserts a suction tube into the opening of the tracheal cannula to suck the sputum. However, this treatment method forces the caregiver to work day and night. As a result, the burden on the caregiver has increased.
Therefore, in order to solve this problem, an artificial respiration system as disclosed in, for example, Patent Document 1 has been developed. A conventional artificial respiration system mounts an artificial respiration suction dual adapter on a tracheal cannula, and opens and closes a pair of valves provided in the artificial respiration suction dual adapter such that when one valve opens, the other valve closes. Perform the operation. As a result, the tracheal cannula is used for each other's passage, and the patient's respiration is ensured by the artificial respirator, and the sputum in the trachea is sucked out by the sputum suction device.
By using such an artificial ventilation suction dual-purpose adapter, the caregiver removes the respiratory tract adapter, which was the conventional method for treating sputum, pauses artificial respiration for a short time, and removes sputum that blocks the tracheal cannula during that time. In addition, it is possible to eliminate the trouble of sucking by the suction tube.
[0003]
[Patent Document 1] JP-A-2002-219175 (page 1, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, in a conventional artificial respiration system using a dual-purpose adapter for artificial respiration and suction, securing of respiration to a patient and suction of sputum are performed alternately. Therefore, when the sputum was sucked out, the patient could not breathe.
In addition, a valve opening / closing mechanism having a complicated structure in which one valve is opened and the other valve is closed has been incorporated into the artificial respiration suction adapter. As a result, the adapter for both artificial respiration and suction is apt to fail, and the cost is increased.
Further, in the conventional artificial respiration system, the internal flow path of the tracheal cannula serves as a respiratory path for air supply and exhaust and a suction path for sputum. Therefore, when air is supplied into the trachea from the ventilator immediately after the suction of the sputum, the sputum attached to the inner wall surface of the tracheal cannula may be pushed back into the trachea.
[0005]
[Object of the invention]
The present invention is capable of breathing even when sputum is sucked, has a simple structure, is low in cost and hardly breaks down, and has no possibility of pushing sputum back into the trachea by sending air from a respirator. It is intended to provide a respiratory system and a tracheal cannula.
Another object of the present invention is to provide an artificial respiration system and a tracheal cannula that can make it difficult for the tracheal cannula to damage the inner peripheral surface of the trachea.
Further, another object of the present invention is to provide an artificial respiration system capable of detecting the presence or absence of sputum generated in the trachea and automatically sucking the sputum.
An object of the present invention is to provide a tracheal cannula that can measure airway pressure without interfering with operation of a ventilator.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, a respirator to which a respiratory tube for air supply and exhaust is connected, a tracheal cannula connected to the respiratory tube and inserted into a trachea of a patient, and accumulated in the trachea. An artificial respiration system including a sputum aspirator to which a suction tube for sucking sputum is connected, wherein the suction tube is fixed to the tracheal cannula.
An artificial respirator is a device that alternately repeats air supply and exhaust to a trachea at regular intervals in order to ensure the patient's breathing. The structure of the ventilator is not limited.
[0007]
The tracheal cannula is a short tube member inserted into the trachea through a hole formed in the trachea by tracheostomy. A cuff that can be expanded and contracted by inflow and outflow of air may be attached to the outer peripheral surface of the tracheal end of the tracheal cannula to close the gap between the trachea and the tracheal cannula.
Fixing the suction tube to the tracheal cannula includes not only fixing the suction tube and the tracheal cannula integrally, but also attaching the suction tube to the tracheal cannula so that the suction tube can be always inserted and removed. The suction tube may be fixed to the inner peripheral surface or the outer peripheral surface of the passage wall of the tracheal cannula. The suction tube may be detachably divided into a portion fixed to the suction tube and a portion extending therefrom to the sputum suction device.
The sputum suction device is a device that sucks out sputum accumulated in the trachea through a suction tube due to a negative pressure generated inside the sputum suction device.
[0008]
The invention according to claim 2 is the artificial tracheal cannula according to claim 1, wherein the tracheal cannula has a double-tube structure in which a respiratory path for air supply and exhaust and a suction path for sputum are separately provided. It is a respiratory system.
For example, a double pipe structure in which a suction path is arranged over the entire outer periphery of the respiratory path may be used. Further, a double pipe structure in which the suction passage is arranged only in a part of the outer periphery of the breathing passage may be used.
The tracheal port of the respiratory tract and the sputum suction port of the suction tract may be arranged on the same plane or on different planes.
[0009]
The invention according to claim 3 is the artificial respiration system according to claim 2, wherein the tracheal cannula has a tracheal-side opening of the respiratory tract disposed outside a sputum suction port of the suction tract. .
The term “outward” means that the respiratory tract and the suction tract extend in the direction in which the respiratory tract extends longer in that direction than the suction tract. The distance between the tracheal port of the respiratory tract in the axial direction of the tracheal cannula and the sputum suction port of the suction path is preferably less than 5 mm. If it exceeds 5 mm, the tissue in the trachea may be sucked and damaged.
[0010]
The invention according to claim 4 has a first pressure sensor for measuring an airway pressure, and a control unit that activates the sputum suction device when the airway pressure is equal to or higher than a predetermined value. An artificial respiration system according to claim 3.
The position where the airway pressure is measured is not limited. For example, it may be in the patient's trachea, tracheal cannula, or respiratory tract.
The magnitude of the airway pressure that activates the sputum aspirator is not limited. It is changed according to the height and weight of the patient. For example, it is not less than 2.50 KPa.
[0011]
The invention according to claim 5 is a second pressure sensor for measuring the internal pressure of the suction passage, and when the internal pressure of the suction passage is equal to or less than a predetermined value, the operation of the sputum suction device is continued, and the internal pressure of the suction passage is maintained. The artificial respiration system according to any one of claims 1 to 4, further comprising a control unit that stops the sputum aspirator when the value exceeds a predetermined value.
The magnitude of the internal pressure of the suction passage for continuing the operation of the sputum suction device is not limited. It is changed according to sputum volume or sputum viscosity. For example, it is -20 KPa or less. Further, the magnitude of the internal pressure of the suction path for stopping the operation of the sputum suction device is also appropriately changed according to the amount of sputum, the viscosity of sputum, and the like. For example, when it exceeds -18 KPa.
[0012]
According to a sixth aspect of the present invention, in a tracheal cannula inserted into a patient's trachea and connected to a respiratory tube extending from a ventilator, a respiratory path for air supply and exhaust and a suction path for sputum are separated. 1 is a tracheal cannula having a double-tube structure provided in the present invention.
[0013]
The invention according to claim 7 is the tracheal cannula according to claim 6, wherein a branch pipe for measuring an airway pressure by a first pressure sensor is connected to the respiratory tract.
[0014]
[Action]
According to the ventilator system of claim 1 or the tracheal cannula of claim 6, air supply and exhaust to the trachea of the patient using the ventilator are performed through the internal passageway (respiratory tract) of the tracheal cannula in a conventional manner. Is On the other hand, when sputum accumulates in the trachea, simply operating the sputum suction device causes the sputum to be sucked out of the body through the suction tube (sputum suction passage) due to the negative pressure. At this time, since the respiratory tract is always in communication with the artificial respirator, breathing is ensured even during the suction of sputum.
In this way, the suction tube is fixed to the tracheal cannula so that sputum can be constantly suctioned as needed, so that the adapter of the breathing tube is removed as in the conventional artificial respiration system, and the suction tube is connected to the trachea in the meantime. The labor of inserting in the cannula and sucking out sputum can be saved. In addition, since the structure is simpler than that of a conventional artificial respiration system having a dual-purpose adapter for artificial respiration and suction, it is low in cost and hardly breaks down. Further, in the tracheal cannula, since the respiratory path and the sputum suction path are separately provided, immediately after the suction of the sputum, the sputum remaining in the tracheal cannula may be pushed back into the trachea by the air supply from the ventilator. There is no.
[0015]
In particular, according to the artificial respiratory system of claim 2 or the tracheal cannula of claim 6, the tracheal cannula has a double tube structure in which the respiratory tract and the sputum suction passage are separated, so that the internal flow passage is effectively used. It can be utilized and the tracheal cannula can be finished in a smooth circular tube shape. This makes it difficult for the tracheal cannula to damage the inner peripheral surface of the trachea.
[0016]
According to the artificial respiration system of claim 3, the trachea-side opening of the respiratory tract is arranged outside the sputum suction opening of the suction passage, so that when the sputum is sucked, the sputum passed through the sputum suction opening. Is difficult to prevent breathing by the respirator through the respiratory tract.
[0017]
According to the fourth and fifth aspects of the artificial respiration system, the first pressure sensor measures the airway pressure or the second pressure sensor measures the internal pressure of the sputum suction passage provided in the tracheal cannula. I do. At this time, when the measured airway pressure is equal to or higher than a predetermined value, the control unit activates the sputum aspirator. Alternatively, when the internal pressure of the suction passage is equal to or lower than a predetermined value, the operation of the sputum suction device is continued by the control unit, and when the internal pressure of the suction passage exceeds the predetermined value, the sputum suction device is stopped.
Thus, the presence or absence of sputum generated in the trachea can be detected, and sputum can be automatically sucked. In particular, in the artificial respiration system according to the fifth aspect, the sputum aspirator can be automatically stopped after the sputum is sucked.
[0018]
Furthermore, according to the tracheal cannula of the seventh aspect, the branch pipe for measuring the airway pressure by the first pressure sensor is communicated with the respiratory path formed inside the tracheal cannula, so that there is no hindrance to the operation of the ventilator. Airway pressure can be measured.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 10 denotes an artificial respiration system according to a first embodiment of the present invention. The artificial respiratory system 10 includes a ventilator 12 to which a breathing tube 11 for supplying and exhausting air is communicated, a tracheal cannula 14 to be inserted into a patient's trachea 13, and a tracheal tube 13 which communicates with the breathing tube 11. There is provided a sputum aspirator 16 to which a suction catheter (suction tube) 15 for sucking up sputum accumulated in the inside is connected, and a control box (control unit) 18 for controlling ON / OFF of the respirator 12 by a sequencer 17. .
[0020]
The artificial respirator 12 is a device that operates a built-in suction device and a compressor alternately at regular time intervals to secure a patient's breathing. The breathing tube 11 communicates the air supply / exhaust port of the ventilator 12 with a mount (joint portion) 20 attached to the base of the tracheal cannula 14. An exhalation valve 21 is provided in the middle of the breathing tube 11.
The tracheal cannula 14 is a plastic tube curved into a substantially J shape inserted into a hole formed in the patient's trachea 13 by tracheostomy. The inner diameter of the tracheal cannula 14 is 9 mm, and the tip is open into the trachea. One end of a first monitor tube (branch tube) 22 for measuring an airway pressure is connected to an upper end portion of the tracheal cannula 14 with a respiratory passage 14 a in the tracheal cannula 14. On the other hand, the other end of the first monitor tube 22 is connected to a first pressure sensor 30A housed in the control box 18. Thus, the airway pressure can be measured by the first pressure sensor 30A via the first monitor tube 22. As a result, sudden occurrence of sputum can be detected and promptly dealt with. Further, instead of the first monitor tube 22, another monitor tube which samples the air passing through the exhalation valve 21 and guides the air to the first pressure sensor 30A may be employed.
[0021]
In the tube of the tracheal cannula 14, the tip of the suction catheter 15 extended from the sputum suction device 16 is placed via the mount 20. The insertion position of the distal end portion of the suction catheter 15 is set at a substantially intermediate position from the distal end of the tracheal cannula 14 to the tracheal bifurcation. The outer diameter of the suction catheter 15 is 4 mm. Therefore, a large respiratory passage 14a having a cross-sectional area of 51 mm ² is secured in the internal passage of the tracheal cannula 14. This allows the patient to breathe easily. Further, inside the suction catheter 15, a suction passage 15a for sputum is formed. Further, a sputum suction port 15b is formed at the distal end of the suction catheter 15. The formation position of the sputum suction port 15b is not the tip of the suction catheter 15 but a peripheral side wall in order to prevent damage to the tracheal mucosa. That is, the distal end of the suction catheter 15 is sealed in a hemispherical shape, and a sputum suction port 15b of a predetermined size is formed on the tube side wall at the distal end.
[0022]
The sputum aspirator 16 is an instrument that sucks out the sputum accumulated in the trachea 13 through the suction catheter 15 due to the negative pressure generated inside, and collects it in the sputum collection bin 23.
The control box 18 houses the sequencer 17, the first pressure sensor 30A and the second pressure sensor 30B for detecting the airway pressure or the suction pressure of the suction catheter 15, and the timer 24. The suction pressure is detected by the second pressure sensor 30B via the second monitor tube 25 communicated in the middle of the suction catheter 15. The control box 18 is connected to a self-switch 26 that allows the patient to start the test aspiration at his own discretion.
[0023]
Next, the operation of the artificial respiration system 10 according to the first embodiment will be described.
Breathing of the patient, i.e., insufflation and discharge to the patient's trachea 13 using the ventilator 12, is performed through the breathing tube 11 and the mount 20, through the respiratory tract 14a in the tracheal cannula 14, as before. .
Hereinafter, the operation of sucking sputum using the sputum suction device 16 will be described in detail with reference to a flow sheet for controlling the artificial respiration system 10 using the sequencer 17 in FIG.
When the elapsed time every 10 to 20 minutes is detected by using the timer 24 (S100), the sputum suction device 16 is activated, and the test suction is performed for 5 seconds (S101).
[0024]
At the time of the test suction, if the pressure in the suction catheter 15 detected by the second pressure sensor 30B is −20 KPa or less, it is considered that sputum has been generated in the trachea 13 and the process proceeds to the main suction for 20 seconds ( S102, S103). The test suction is also started when the airway pressure monitored by the first pressure sensor 30A using the first monitor tube 22 always exceeds a predetermined set pressure (S104). Furthermore, the test suction can be started by turning on the self-switch 26 according to the patient's self-determination (S105). At the time of the test suction, if the pressure in the suction catheter 15 exceeds -20 KPa, it is considered that sputum has not been generated, and the test suction is terminated (S107). The main suction is continued until the second pressure sensor 30B returns to -18 KPa or more (S106). Then, when the suction pressure reaches -18 KPa, the main suction ends (S107).
[0025]
In this way, the suction catheter 15 is fixed to the tracheal cannula 14 so that sputum can be always sucked as needed, so that the adapter of the breathing tube 11 is removed as in a conventional artificial respiration system, and suction is performed during that time. The trouble of inserting the catheter 15 into the tracheal cannula 14 and sucking out sputum can be omitted. In addition, since the structure is simpler than that of a conventional artificial respiration system having a dual-purpose adapter for artificial respiration and suction, it is low in cost and hardly breaks down. Further, in the tracheal cannula 14, since the respiratory path 14 a and the sputum suction path 15 a are separately provided, the sputum remaining in the tracheal cannula 14 due to the air supply from the respirator 12 immediately after the suction of the sputum. There is no risk of being pushed back into the trachea 13. Further, the presence or absence of sputum generated in the trachea 13 can be detected, and the sputum can be automatically sucked. Furthermore, since the first monitor pipe 22 for measuring the airway pressure by the first sensor 30A is connected to the respiratory path 14a formed inside the tracheal cannula 14, the airway pressure can be reduced without hindering the operation of the ventilator 12. Can be measured.
[0026]
Next, an artificial respiration system according to a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, as a tracheal cannula 14, a double tube in which a breathing passage 14a for supplying and exhausting air to and from the lungs of a patient and a suction passage 15a for sputum connected to a suction catheter 15 are separately provided. This is an example in which one having a structure is adopted. At this time, the tracheal-side port 14b of the respiratory path 14a and the sputum suction port 15b of the suction path 15a are formed in the same plane.
In the tracheal cannula 14 shown in FIGS. 3A and 3B, the cross-sectional shape of the suction passage 15 a for sputum has a substantially crescent shape along the inner peripheral surface of the tracheal cannula 14. Further, the tracheal cannula 14 shown in FIG. 3 (c) has a suction path 15a having a crescent cross section in which a partition plate from the respiratory path 14a is flat. Further, the tracheal cannula 14 shown in FIG. 3D has a suction passage 15a having a convex cross section in which a partition plate for the respiratory passage 14a protrudes toward the respiratory passage 14a.
Further, FIGS. 4A and 4B illustrate another tracheal cannula 14 in which a suction path 15a is formed in a double tube structure on the outer peripheral side of a respiratory path 14a. The cross-sectional area of the respiratory tract 14a in the tracheal cannula 14 is about 50 mm ² .
[0027]
As described above, since the tracheal cannula 14 has a double tube structure in which the respiratory path 14a and the sputum suction path 15a are separated, the internal flow path of the tracheal cannula 14 can be effectively used. In addition, the tracheal cannula 14 can be finished in a smooth circular tube shape. Accordingly, the length of the hole formed by cutting the trachea 13 can be shortened, and the inner peripheral surface of the trachea 13 is hardly damaged by the tracheal cannula 14 inserted into the hole.
Other configurations, operations, and effects are the same as those of the first embodiment, and a description thereof will not be repeated.
[0028]
Next, an artificial respiration system according to a third embodiment of the present invention will be described with reference to FIG.
In the third embodiment, the tracheal cannula 14 is formed integrally with the tracheal cannula 14 over a substantially entire length thereof at a predetermined interval along a peripheral plate of the tracheal cannula 14 with a sputum suction passage 15 a having a substantially crescent cross section. Moreover, in this example, the tracheal port 14b of the respiratory path 14a is disposed outwardly (protruding toward the distal end) by a protruding length d (2 mm) from the sputum suction port 15b of the suction path 15a.
A cuff 32 is provided on the outer peripheral surface of the distal end portion of the tracheal cannula 14 so as to be expandable and contractable by inflow and outflow of air. The gap between the trachea 13 and the tracheal cannula 14 is closed by the inflated cuff 32. The cross-sectional area of the respiratory tract 14a in the tracheal cannula 14 is about 50 mm ² .
As described above, since the mouth of the respiratory passage 14a on the side of the trachea 13 is disposed outside the sputum suction port 15b of the suction passage 15a, the suction force through the sputum suction port 15b at the time of sucking sputum increases It is difficult to prevent breathing by the respirator 12 through the road 14a.
Other configurations, operations, and effects are substantially the same as those of the second embodiment, and thus description thereof is omitted.
[0029]
Here, with reference to the graph of FIG. 6, the result of the clinical test of the artificial respiration system of the first embodiment, which was continuously performed overnight, is reported.
The clinical trial was performed on female patients on May 14, 2001. The test location was a hospital. As the mount, a double-sebel catheter mount manufactured by Marinck Lot Co., Ltd., into which a suction catheter can be inserted and placed from above the mount, was used. The mount was connected to the patient's tracheal cannula, and through its upper hole, the suction catheter was guided through the tracheal cannula and into the trachea. A Minic-W manufactured by Shinko Kogyo Co., Ltd. was used for the respirator, and a SYSMAC CPM1A manufactured by OMRON was used for the sequencer. In addition, two timers of Omron H3YN-2 (for setting a test suction interval and for setting a test suction time) were employed as timers. Further, PKD-V01AHN-6P manufactured by CKD was adopted as the first pressure sensor and the second pressure sensor.
[0030]
Attachment of the artificial respiration system to the patient was performed at 21:30. Since the patient was awake, the interval between test aspirations began every 10 minutes. From 23:00 to 8:00 the next day, the sleep mode was set, and the test suction was extended every 20 minutes. The next morning, the subjects were returned every 10 minutes from 8:00, and the clinical test was terminated at 10:30.
As is clear from the graph of FIG. 6, in the sleep mode, no manual suction was required which was different from the automatic suction. Also, no alarm was generated from the ventilator to notify that the airway pressure had exceeded the set value. The amount of sputum collected in the overnight clinical experiment was about 30 ml.
[0031]
From this result, it is considered that the artificial respiration system of the first embodiment worked effectively even in the clinical trial continued overnight.
Before and after the test, safety was confirmed by observing the inside of the trachea using a bronchial fiberscope. That is, no changes in the endotracheal mucosa such as bleeding, inflammation, ulcer, and erosion were observed in the trachea. Also, during the overnight clinical test, there was no significant change in the monitor index with respect to heart rate and oxygen saturation (FIG. 6).
In addition, a series of clinical trials have shown that when sputum is suctioned using an indwelling suction catheter, the patient does not suffer from the “choking” that occurs with conventional manual suction procedures. This has been captured as a phenomenon that sleep is not interrupted even in the overnight test. Thereby, the tracheostomy patient can be released from the annoyance of “choking” in the suction operation.
[0032]
【The invention's effect】
According to the artificial respiratory system of claim 1 or the tracheal cannula of claim 6, the suction tube is fixed to the tracheal cannula so that sputum can be constantly sucked as needed, so that the same as in the conventional artificial respiratory system. Removing the adapter for the respiratory tract, during which the suction tube is inserted into the tracheal cannula, eliminating the need to suck out sputum.
Moreover, since the structure is simpler than that of a conventional artificial respiration system equipped with an artificial ventilation suction dual-purpose adapter, it is low in cost and difficult to break down, and the respiratory path and the sputum suction path are separated in the tracheal cannula. Immediately after aspiration of sputum, there is no possibility that sputum remaining in the tracheal cannula will be pushed back into the trachea due to air supply from the ventilator.
[0033]
In particular, according to the artificial respiration system of claim 2 or the tracheal cannula of claim 6, the tracheal cannula has a double tube structure in which the respiratory path and the suction path for sputum are separated, so that the internal flow path is effectively used. And the tracheal cannula can be finished in a smooth circular tube shape. Thereby, the length of the hole formed by cutting the trachea can be shortened, and the inner peripheral surface of the trachea is hardly damaged by the tracheal cannula inserted into the hole.
[0034]
According to the artificial respiration system of claim 3, the trachea-side opening of the respiratory tract is arranged outside the sputum suction opening of the suction passage, so that when the sputum is sucked, the sputum passed through the sputum suction opening. Is difficult to prevent breathing by the respirator through the respiratory tract.
[0035]
Furthermore, according to the artificial respiration system of claim 4 and claim 5, the first pressure sensor measures the airway pressure or the second pressure sensor measures the pressure of the sputum suction passage provided in the tracheal cannula. As a result, the presence or absence of sputum generated in the trachea can be detected, and the sputum can be automatically aspirated. In particular, in claim 5, the sputum aspirator can be automatically stopped after the sputum is sucked.
[0036]
According to the tracheal cannula of the present invention, since the branch pipe for measuring the airway pressure by the first sensor is connected to the respiratory path formed inside the tracheal cannula, the airway pressure can be maintained without interfering with the operation of the ventilator. Can be measured.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of an artificial respiration system according to a first embodiment of the present invention.
FIG. 2 is a flow sheet for controlling the artificial respiration system according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view of a tracheal cannula provided in an artificial respiration system according to a second embodiment of the present invention.
FIG. 4 is a cross-sectional view of another tracheal cannula provided in the artificial respiration system according to the second embodiment of the present invention.
FIG. 5 is a cross-sectional view of a tracheal cannula provided in an artificial respiration system according to a third embodiment of the present invention.
FIG. 6 is a graph of a clinical trial of a ventilator system performed overnight.
[Explanation of symbols]
10 artificial respiration systems,
11 respiratory tract,
12 ventilator,
13 trachea,
14. Tracheal cannula,
14a respiratory tract,
14b tracheal side mouth,
14c sputum suction port,
15 suction catheter (suction tube),
15a suction path,
16 sputum aspirator,
22 first monitor tube (branch tube),
30A first pressure sensor,
30B Second pressure sensor.

Claims (7)

A ventilator with breathing tubes for air supply and exhaust,
A tracheal cannula communicated with the respiratory tract and inserted into the patient's trachea;
In an artificial respiratory system comprising a sputum aspirator to which a suction pipe for sucking sputum accumulated in the trachea is connected,
An artificial respiration system in which the suction tube is fixed to the tracheal cannula. The artificial respiratory system according to claim 1, wherein the tracheal cannula has a double-tube structure in which a respiratory path for air supply and exhaust and a suction path for sputum are separately provided. The artificial respiration system according to claim 2, wherein the tracheal cannula has a trachea-side opening of the respiratory tract disposed outside a sputum suction port of the suction tract. 4. The apparatus according to claim 1, further comprising a first pressure sensor for measuring an airway pressure, and a control unit for operating the sputum aspirator when the airway pressure is equal to or higher than a predetermined value. The artificial respiration system according to the paragraph. A second pressure sensor for measuring the internal pressure of the suction path,
When the internal pressure of the suction passage is equal to or less than a predetermined value, the control unit stops the sputum suction device when the internal pressure of the suction passage exceeds a predetermined value. The artificial respiration system according to any one of claims 1 to 4. In a tracheal cannula that is inserted into the patient's trachea and to which the respiratory tract extended from the ventilator is connected,
A tracheal cannula having a double-pipe structure in which a respiratory path for air supply and exhaust and a suction path for sputum are separately provided. The tracheal cannula according to claim 6, wherein a branch tube for measuring an airway pressure by a first pressure sensor is connected to the respiratory tract.

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