JP6249614B2 - Respiratory gas heating humidifier - Google Patents

Description

  The present invention relates to a warming / humidifying device for maintaining a breathing gas used in a ventilator, oxygen inhalation therapy, or the like at an appropriate temperature and humidity.

  2. Description of the Related Art There are known a ventilator for sending a breathing gas containing a predetermined amount of oxygen to a patient's respiratory tract and a device for oxygen inhalation therapy. In such devices, when the patient is supplied with dry breathing gas, the patient's throat, nasal cavity and mucous membranes will dry out over time, causing not only discomfort to the patient, but also airway damage. There is a fear. For this reason, a warming humidifier for taking water vapor into the breathing gas and maintaining it at an appropriate temperature and humidity has been used.

  And as a breathing gas warming humidifier, for example, a breathing gas is passed through a chamber in which water is stored as disclosed in Patent Document 1 or Patent Document 2 and humidified with evaporated water, etc. It has been known. However, in such a warming humidifier, the water stored in the chamber is consumed as the breathing gas is humidified. It is necessary to supply water inside.

Therefore, for example, Patent Document 1 describes that a water level in the chamber is confirmed by arranging a float (float member) in the chamber and visually confirming the float floating on the water surface.
Moreover, in patent document 2, when the float which floats on the water surface is provided with the sealing part of the water supply inlet (water inlet), when the water in a chamber exceeds a designated water level (1st water level) It is described that the water supply port is sealed and the water supply port is opened when the water supply port is below the specified water level to keep the water level in the chamber constant.

JP-T-2004-517893 JP 2012-185825 A

  However, in the configuration in which the position of the float is visually confirmed like the heating humidifier described in Patent Document 1, the user always monitors the water level in the chamber and manually supplies water according to the water level. It will be necessary. In this case, in order to secure the water pressure necessary for water supply, the water supply bag is provided at a position higher than the chamber, and water is supplied into the chamber by utilizing the gravity due to its height ( Gravity supply method).

Moreover, in the heating humidifier described in Patent Document 2, the water supply port is opened and closed as the float moves up and down, so that water is automatically supplied into the chamber. After all, since water is supplied by the gravity supply method, it is necessary to install the water supply bag above a certain height so as not to lose the internal pressure in the chamber.
For this reason, depending on the mounting position of the water supply bag, it becomes impossible to smoothly supply water, and when water supply is not properly performed, the humidification efficiency is lowered and the respiratory gas is sufficiently humidified. There is a risk that a so-called emptying phenomenon may occur, in which heating is performed in a state where water is exhausted in the chamber.

  This invention is made | formed in view of such a situation, and it aims at providing the warming humidifier of the breathing gas which can perform a continuous driving | running, maintaining the stable humidification capability.

The present invention is a respirating gas heating / humidifying device that circulates a respiration gas in a chamber in which water is stored and that heats and humidifies the sensor, and detects a water level of water stored in the chamber; A water supply unit configured to supply water into the chamber based on a detection result of the sensor, and the water supply unit connects the water supply bag in which water is stored, the water supply bag, and the chamber. A water supply hose, and a water supply pump disposed between the water supply bag and the chamber for supplying water in the water supply bag, wherein the sensor is a plurality of sensors disposed at a height of three stages. When the water level in the chamber is determined to be lower than the standard position because water is not detected by the unit disposed at the center height , water is supplied from the water supply unit, and the center Yu placed at the height of When water is detected by the knit, the water supply is stopped, and a warning is issued when a high water level is detected by the uppermost unit or a low water level is detected by the lowermost unit. It is characterized by.

  The amount of water (water level) in the chamber can be managed by the sensor, and water is supplied according to the detection result of the sensor. Since water supply from the water supply bag to the chamber is forcibly performed by the water supply pump, water can be reliably supplied into the chamber regardless of the mounting position of the water supply bag. Therefore, it is possible to maintain a stable humidification capability, prevent the occurrence of the airing phenomenon, and ensure the continuous operation of the warming humidifier.

In the breathing gas heating humidifier according to the present invention, the water supply pump has a plurality of holding bodies that intermittently hold a part of the water supply hose, and the water supply hose is continuously cut by the holding bodies. While holding, the holding position is moved from the water supply bag side to the chamber side, whereby water in the water supply hose is fed.
In this case, since water is supplied while always holding a part of the water supply hose by any of the clamping bodies, water supply is performed while preventing the water in the water supply hose from flowing back regardless of the internal pressure in the chamber. The water can be reliably supplied into the chamber.

  According to the present invention, the water level in the chamber is managed by the sensor, and water supply is forcibly performed by the water supply pump according to the detection result of the sensor, so that water can be reliably supplied into the chamber and stable. It is possible to ensure continuous operation while maintaining the humidifying ability.

1 is an overall perspective view showing an embodiment of a breathing gas heating humidifier according to the present invention. It is a perspective view which shows the state which opened the cover part of the chamber of the heating humidifier shown in FIG. It is a cross-sectional perspective view of the chamber part of a heating humidifier. It is a cross-sectional perspective view which shows the state which removed the chamber from the state shown in FIG. It is a principal part cross-section perspective view which shows the state which removed the tower unit from the container part. It is a perspective view of a tower unit. It is a figure explaining the connection by the water supply hose with a chamber and the bag for water supply. It is a perspective view of a finger type water supply pump, (a) shows the state where the door was closed, and (b) shows the state where the door was opened. It is a schematic diagram explaining the drive of a water pump. It is sectional drawing which follows the AA line in FIG. It is a figure explaining the structure of a sensor, (a) is a perspective view of the light emission board | substrate which mounts three light emission parts, (b) is a perspective view of the light reception board | substrate which mounts three light reception parts. It is a figure explaining a roller-type water supply pump, (a) is a perspective view, (b) is a top view of the state which removed the cover.

Hereinafter, a breathing gas heating humidifier according to an embodiment of the present invention will be described with reference to the drawings.
The breathing gas heating humidifier 100 of the present embodiment shown in FIG. 1 is used by being connected to, for example, a CPAP device for assisting spontaneous breathing to treat a respiratory disorder. A CPAP device is a device that treats a patient using an auxiliary stimulation method called a continuous positive airway pressure (CPAP), via a patient interface such as a nasal prong, tracheal intubation tube, or nasal mask. A breathing gas consisting of a predetermined amount of a mixture of oxygen and air is supplied to the patient. The warming humidifier 100 is provided to maintain the breathing gas supplied to the patient at an appropriate temperature and humidity, and the breathing gas sent from the CPAP device is heated by the warming humidifier 100. It is humidified and supplied to the patient.

As shown in FIG. 1, the warming humidifier 100 includes a main body 1 with a built-in control unit, a base 2 provided integrally with the main body 1, and a chamber 3 provided detachably on the base 2. A supply hose 4 for sending a breathing gas into the chamber 3, an interface connection hose 5 for sending the heated and humidified breathing gas from the chamber 3 to the patient interface, and a water supply unit 6 for supplying water into the chamber 3 With.
Further, the base 2 of the warming humidifier 100 is provided with a sensor 20 (see FIGS. 4 and 10) for detecting the water level of the water stored in the chamber 3, and the warming humidifier 100. During the operation, water is supplied from the water supply unit 6 according to the water level in the chamber 3. Details thereof will be described later.
As shown in FIG. 1, the heating / humidifying device 100 is placed on a gantry 7 that is movable by a caster 71, and is movable together with the gantry 7.

  The base 2 is formed with a recess 21 into which the chamber 3 can be mounted by fitting the lower portion of the chamber 3, and a substantially columnar heater 22 is erected vertically at the center of the recess 21. The surface of the heater 22 is airtightly covered with a heat sink 23 made of a metal having high thermal conductivity (for example, aluminum).

The chamber 3 is composed of a container part 8 for storing water and a lid part 9 attached to the upper part of the container part 8. The chamber 3 is composed of the container part 8 and the lid part 9 and is used for breathing in the internal space of the chamber 3. By passing the gas, the breathing gas can be heated and humidified.
The container 8 and the lid 9 of the chamber 3 are formed of a transparent resin such as an acrylic resin such as polycarbonate resin (PC) or PMMA, or a polysulfone resin (PSU).

The lid portion 9 is detachably provided on a hinge mechanism portion 24 provided on the main body 1 and has a lock portion 25 that engages with the container portion 8. When the lid portion 9 is mounted on the hinge mechanism portion 24, the lid portion 9 is rotatably supported by the main body 1 by the base end portion of the hinge mechanism portion 24, and can open and close the upper portion of the container portion 8 as shown in FIG. It is like that. The lid portion 9 can be attached to and detached from the upper portion of the container portion 8 even in a state where it is detached from the hinge mechanism portion 24.
Further, as shown in FIGS. 1 and 2, the lid 8 has an inlet 41 for taking in the breathing gas into the internal space of the chamber 3, and an outlet for leading the breathing gas humidified in the chamber 3 to the outside. 51 and a water supply port 61 for supplying water for humidification into the chamber 3 are provided. The inlet 41 is connected to the supply hose 4, the outlet 51 is connected to the interface connection hose 5, and the water inlet 61 is connected to the water supply unit 6.

As shown in FIGS. 3 and 4, the container portion 8 is provided with a heating plate 81 made of a metal (for example, aluminum) having high thermal conductivity at the center of the bottom portion. The heating plate 81 is formed in a shape in which the upper end of the substantially cylindrical sleeve-shaped body portion is integrally closed with the top plate portion. The outer peripheral surface 81a of the heating plate 81 constitutes a part of the internal space of the chamber 3, and the internal space is formed in a ring-shaped space. A heat sink 23 is inserted inside the body portion of the heating plate 81 when the container portion 8 is mounted on the base 2.
In this case, the heat sink 23 and the heating plate 81 are formed in a slightly tapered shape so that the diameter gradually decreases toward the upper side, and the outer peripheral surface 23a of the heat sink 23 and the inner peripheral surface 81b of the heating plate 81 are substantially the same. By being formed at an inclined angle, when the heating plate 81 is fitted to the heat sink 23, the inner peripheral surface 81b of the heating plate 81 and the outer peripheral surface 23a of the heat sink 23 are in surface contact, and the heat of the heater 22 is absorbed by the heat sink. 23 is smoothly transmitted to the heating plate 81 via
And the tower unit 10 which has the sheet-like humidification member 11 is attached to the outer peripheral surface 81a of this heating plate 81 so that attachment or detachment is possible (refer FIG. 5).

As shown in FIG. 6, the tower unit 10 includes a frame body 12 that supports the sheet-shaped humidifying member 11 in a substantially cylindrical shape, and a cylindrical partition plate 13 that is provided around the sheet-shaped humidifying member 11 with a space therebetween. These two parts are combined. And the frame 12 and the partition plate 13 are formed with resin, such as a polypropylene.
The frame body 12 has a shape in which the annular portions arranged at both ends in the length direction of the tower unit 10 are connected by four plate-like portions, and is a sheet-like humidifying member that closes between the plate-like portions. By attaching 11, the sheet-like humidifying member 11 is held in a substantially cylindrical shape. In this case, since the heating plate 81 is formed in a slight taper shape, the plate-like portion and the sheet-like portion of the frame body 12 can be brought into close contact with the outer peripheral surface 81a of the heating plate 81. Similarly to the heating plate 81, the humidifying member 11 is also formed in a slight taper shape having an inclination so that the diameter gradually decreases toward the upper side.

Further, the partition plate 13 is formed in a cylindrical shape covering the outside of the frame body 12, and the frame body 12 and the partition plate 13 are connected at both ends of the tower unit 10.
And in the state which attached the tower unit 10 to the heating plate 81 of the container part 8, while arrange | positioning so that the sheet-like humidification member 11 may surface-contact with the outer peripheral surface 81a of the heating plate 81, the partition plate 13 of the chamber 3 The internal space is partitioned into a double ring-shaped space with an inner side and an outer side. Accordingly, the internal space of the chamber 3 is partitioned into an internal humidification space 31 in which the sheet-like humidification member 11 is disposed and a preheating space 32 adjacent to the humidification space 31.

In addition, a communication portion 33 that communicates the preheating space 32 and the humidification space 31 is provided at the lower portion of the partition plate 13. The communication portion 33 includes a lower communication portion 34 disposed below the water surface, It is comprised by the upper side communication part 35 arrange | positioned above the lower side communication part 34, and adjoining to the water surface w and opened on the water surface. And the water in the container part 8 can be distribute | circulated between the preheating space 32 and the humidification space 31 by the lower side communication part 34, and water is stored by the same water level in the preheating space 32 and the humidification space 31. .
In this case, the lower end of the tower unit 10 is immersed in water and the lower end of the heating plate 81 is also immersed in water. However, most of the tower unit 10 and the heating plate 81 are exposed on the water surface. It is done. For this reason, while the water in the chamber 3 can be heated with the heating plate 81, the space in the chamber 3 can be heated, and the humidity of the internal space of the chamber 3 can be increased.

  The suction port 41 and the water supply port 61 provided in the lid portion 9 are connected to the preheating space 32. On the other hand, the air outlet 51 is connected to the humidification space 31, and the breathing gas taken in from the suction port 41 moves from the preheating space 32 to the humidification space 31 via the communication portion 33 and is taken out from the air outlet 51. It is supposed to be.

The sheet-like humidifying member 11 is made of a material excellent in water absorption and breathability, such as a nonwoven fabric formed of natural materials such as rayon, polyester, and cotton. The sheet-shaped humidifying member 11 is in a state where the lower end is immersed in the water in the container portion 8 in a state where the tower unit 10 is attached to the heating plate 81 as described above. Thereby, the sheet-like humidification member 10 sucks up water by a capillary phenomenon, and water permeates throughout the entire sheet, so that a wet state containing water is maintained.
The sheet-shaped humidifying member 11 can be attached by adhering to the frame body 12, but by inserting the sheet-shaped humidifying member 11 into the mold in advance when the frame body 12 is molded, the frame body 12. It can also be provided integrally.

As shown in FIGS. 1 and 7, the water supply unit 6 that supplies water into the chamber 3 includes a water supply bag 62 in which water is stored, and a water supply hose 63 that connects the water supply bag 62 and the chamber 3. A water supply pump 64 is provided between the water supply bag 62 and the chamber 3 and supplies water in the water supply bag 62.
As shown in FIG. 7, the water supply hose 63 has one end connected to a water supply port 61 provided in the lid portion 9 of the chamber 3 and the other end connected to a water supply bag 62. In response to the detection result of the sensor 20, the water is supplied from the water supply bag 62 into the chamber 3 in accordance with the level of the water stored in the chamber 3.

Moreover, in this embodiment, the water pump 64 is comprised by the finger type water pump shown in FIG. As shown in FIGS. 8A and 8B, the finger-type water supply pump 64 includes a case main body 65 and a door 67 that is swingably supported by the case main body 65 via a hinge portion 66. The case body 65 can be opened and closed. And in the center part of the case main body 65 and the door 67, the recessed groove parts 68a and 68b by which the water supply hose 63 is fitted are provided.
The case main body 65 is provided with a plurality of fingers 91 (a clamping body in the present invention) that are arranged in the same direction, and these fingers 91 are arranged in a line along the length direction of the water supply hose 63. Yes. In addition, the door 67 is provided with a holding plate 92 that is disposed to face the tip of the finger 91 in a state in which the case main body 65 and the door 67 are closed, as shown in FIG. By closing the door 67 after fitting the water supply hose 63 into the concave groove 68 a of the case body 65 with the 67 being opened, a part of the water supply hose 63 can be sandwiched between the finger 91 and the holding plate 92. It has become.

Each finger 91 is supported by a cam mechanism 69 rotated by a motor (not shown) so as to be movable back and forth with respect to the pressing plate 92. As shown in FIG. 9, the water supply pump 64 intermittently sandwiches a part of the water supply hose 63 with each finger 91 moving forward and backward, and while holding a part of the water supply hose 63 without interruption, By moving the clamping position from the upstream side (water supply bag 62) to the downstream side (chamber 3 side), the water in the water supply hose 63 can be sent to the downstream side.
Although not shown, the heating / humidifier 100 is connected to a gas supply device (for example, a CPAP device) for sending a breathing gas into the chamber 3.

  As shown in FIG. 10, the sensor 20 is composed of a unit including a pair of light emitting units 26 and light receiving units 27, and irradiation irradiated from the light emitting unit 26 in the horizontal direction (parallel to the water surface w of the chamber 3). The light L is received by a pair of light receiving portions 27 arranged at the same height as the light emitting portion 26, thereby detecting the water level accumulated in the chamber 3.

In the warming humidifier 100 of this embodiment, as shown to Fig.11 (a) and (b), it is set as the structure provided with three units which consist of a pair of light emission part 26 and the light-receiving part 27, The light emitting section 26 and the light receiving section 27 constituting the unit are arranged outside the container section 8 of the chamber 3 so as to sandwich the container section 8.
And each light emission part 26 is equally arrange | positioned at intervals in the height direction on the board | substrate 26B, as shown to Fig.11 (a). The light receiving portions 27 are also arranged on the substrate 27B at equal intervals in the height direction at the same intervals as the light emitting portions 26, and the light emitting portions 26 and the light receiving portions 27 have the same height for each unit. Are arranged as follows. The light receiving unit 27 receives the irradiation light L1 that travels in the direction refracted by passing through the water stored in the chamber 3 with respect to the irradiation direction of the irradiation light L emitted from the light emitting unit 26 of each unit. It is provided in a possible position.

That is, when the level of water stored in the chamber 3 is higher than the mounting height of the sensor 20 than the optical path of the irradiation light L, the irradiation light L irradiated from the light emitting unit 26 is the water in the chamber 3. The light receiving unit 27 is provided at a position where the refracted irradiation light L1 can be received. Therefore, when the water level in the chamber 3 is lower than the mounting height of the sensor 20, the irradiation light L travels substantially straight through the space part without water in the chamber 3, and the irradiation light L2 traveling substantially straight travels. It cannot be detected by the light receiving unit 27.
Thus, the sensor 20 detects whether the water level in the chamber 3 is higher or lower than the mounting height of the sensor 20 depending on whether or not the light receiving unit 27 can detect the irradiation light L emitted from the light emitting unit 26. Be able to.

Moreover, since the sensor 20 is provided with the light-receiving part 26 and the light-emitting part 27 which consist of a some unit, it can detect a different water level for every unit. Therefore, the level of the water level in the chamber 3 can be finely detected based on the detection result of each unit.
For example, the unit consisting of the light receiving part 26a and the light emitting part 27a arranged at the lowermost side detects the irradiation light L, but the unit consisting of the light emitting part 26b and the light receiving part 27b arranged at the center is irradiated light. If L cannot be detected, it can be seen that the water level in the chamber 3 is at a height between the lower unit and the central unit. If the lower unit and the central unit detect the irradiation light L, but the upper unit composed of the light emitting unit 26c and the light receiving unit 27c cannot detect the irradiation light L, the inside of the chamber 3 It can be seen that the water level is at a height between the central unit and the upper unit. Therefore, the water level in the chamber 3 can be finely detected based on the detection results of the units arranged at these three levels.
And if the water level in the chamber 3 is determined based on the detection result of the sensor 20 (detection results of the light receiving units 26a to 26c), and the water level in the chamber 3 is determined to be lower than the standard position, the water supply unit Water is automatically supplied from 6.

Next, the operation of the warming humidifier 100 will be described.
Before supplying the breathing gas into the chamber 3, water is supplied from the water supply bag 62 into the chamber 3. Thereby, the lower end part of the sheet-like humidification member 11 is immersed under the water surface, and the sheet-like humidification member 11 sucks up water and becomes a wet state. In this state, the gas supply device is driven to supply the breathing gas into the chamber 3 from the suction port 41.

The breathing gas is first introduced into the preheating space 32, and the breathing gas taken into the preheating space 32 flows downward toward the upper communication portion 35 of the partition plate 13. When passing through the preheating space 32, the breathing gas is preliminarily heated and preliminarily humidified by water vapor evaporated from the water surface w in the chamber 3 into the preheating space 32. And when passing through the upper communication part 35 of the partition plate 13 and moving to the humidification space 31, the breathing gas passes through the upper communication part 35 close to the water surface w, so that it comes into contact with the water surface w and is humidified. Promoted.
The breathing gas taken into the humidification space 31 changes its flow direction upward and flows toward the upper outlet 51. At this time, the breathing gas vaporizes moisture contained in the sheet-like humidifying member 11 by flowing along the surface of the humidifying sheet-like humidifying member 11 heated by the heating plate 81. The water vapor is taken in and humidified. Then, the humidified breathing gas is taken out from the air outlet 51 to the outside.

In addition, although the sheet-like humidification member 11 becomes a form in which moisture is deprived by humidifying the breathing gas, since the lower end portion of the sheet-like humidification member 11 is immersed below the water surface, when the breathing gas is humidified At the same time, the water is sucked up and kept wet. For this reason, the gas for breathing can be humidified continuously.
In addition, although the water level decreases as the water in the chamber 3 is consumed, in the humidifier 100, the water level in the chamber 3 is changed based on the detection result of the sensor 20 (detection result of the light receiving unit 27). When the water level in the chamber 3 is determined to be lower than the standard position, water is automatically supplied from the water supply unit 6.
Therefore, by supplying water according to the output of the sensor 20, the water level in the chamber 3 can be managed within a predetermined range, and a continuous operation of the warming humidifier 100 can be performed while maintaining a stable humidification capability. Can be secured.
Specifically, in the unit composed of the light emitting unit 26b and the light receiving unit 27b arranged at the center height of the sensor 20, when the irradiation light L is not detected, water is supplied and the irradiation light L is detected. And the water supply is stopped.

  In addition, when a signal is no longer output in the lower unit (light emitting unit 26a and light receiving unit 27a) of the sensor, the water level in the chamber 3 is determined to be “low water level”. Further, when a signal from the uppermost unit (light emitting unit 26c and light receiving unit 27c) is detected, the water level in the chamber 3 is determined to be “high water level”. And when it is judged as “low water level” or “high water level”, it is set to issue an alarm, so that the safety can be improved and the management of the user can be saved. Yes.

  Thus, according to the heating humidifier 100 of this embodiment, the water level in the chamber 3 can be managed by the sensor 20, and water is supplied according to the detection result of the sensor 20. Water supply from the water supply bag 62 to the chamber 3 is forcibly performed by the water supply pump 64, so that water can be reliably supplied into the chamber 3 regardless of the attachment position of the water supply bag 62. . Therefore, it is possible to maintain a stable humidification capability, prevent the occurrence of the airing phenomenon, and ensure the continuous operation of the warming humidifier 100.

Further, by using the water supply pump 64, water is supplied while always holding a part of the water supply hose 63 by any of the fingers 91, so that the water in the water supply hose 63 flows backward regardless of the internal pressure in the chamber 3. Can be prevented.
In the above embodiment, the water supply pump 64 is constituted by a finger type water supply pump. However, in addition to the finger type water supply pump, a roller type water supply pump 64R as shown in FIG. 12 may be used. The roller-type water supply pump 64R rotates the rotor 94 provided with the roller 93 (the clamping body in the present invention) by the motor 95, thereby holding the water supply hose 63 between the outer cylinder 96 and supplying water. Can be done.

  By the way, in order to clean the inside of the chamber 3, the chamber 3 is periodically cleaned. In the warming humidifier 100 of the present embodiment, the chamber 3 (the container portion 8 and the lid portion 9) can be removed from the base 2 when the chamber 3 is cleaned. Since the heater 22 is attached to the base 2 side, the cleaning operation of the chamber 3 can be easily performed.

  In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Main body 2 Base 3 Chamber 4 Supply hose 5 Interface connection hose 6 Water supply part 7 Base 8 Container part 9 Cover part 10 Tower unit 11 Sheet-like humidification member 12 Frame 13 Partition plate 20 Sensor 21 Recess 22 Heater 23 Heat sink 24 Hinge Mechanism part 25 Lock part 26, 26a to 26c Light emitting part 26B, 27B Substrate 27, 27a to 27c Light receiving part 31 Humidification space 32 Preheating space 33 Communication part 34 Lower communication part 35 Upper communication part 41 Suction port 51 Air outlet 61 Water supply port 62 Water supply bag 63 Water supply hose 64, 64R Water supply pump 65 Case main body 66 Hinge 67 Door 68a, 68b Recessed groove 69 Cam mechanism 71 Caster 81 Heating plate 91 Finger (clamping body)
92 Presser plate 93 Roller (nip)
94 Rotor 95 Motor 96 Outer cylinder 100 Respiratory gas heating humidifier

Claims (2)

A breathing gas heating / humidifying device that circulates a breathing gas in a chamber in which water is accumulated and that heats and humidifies the sensor, and a sensor for detecting a level of water accumulated in the chamber, and detection of the sensor A water supply unit for supplying water into the chamber based on a result, the water supply unit, a water supply bag storing water, a water supply hose connecting the water supply bag and the chamber, A water supply pump disposed between the water supply bag and the chamber for supplying water in the water supply bag;
The sensor includes a plurality of units arranged at three levels of height, and water is not detected by the unit arranged at the center height, so that the water level in the chamber is lower than the standard position. When it is determined that the water is supplied from the water supply unit and water is detected by the unit disposed at the central height, the supply of water is stopped, and the high water level is detected by the unit disposed on the uppermost side. Respiratory gas heating humidifier, characterized by issuing an alarm when a low water level is detected by the lowest unit.   The water supply pump has a plurality of sandwiching bodies that intermittently sandwich a part of the water supply hose, and while holding the water supply hose with these sandwiching bodies without interruption, the clamping position is set on the side of the water supply bag The respirator gas heating humidifier according to claim 1, wherein water in the water supply hose is fed by moving from the chamber to the chamber side.

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