JP6399597B2 - 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 Conventionally, 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 are known. In such devices, when the patient is supplied with dry breathing gas, it not only makes the patient uncomfortable, but can also cause airway damage. 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.

In such a humidifier, since the breathing gas heated and humidified is supplied to the patient interface such as a cannula or mask attached to the patient via the air supply tube, the breathing gas is not supplied. When passing through the air supply tube, the air supply tube is heated so as not to be cooled by the indoor atmosphere.
In this case, if the heater wire is arranged inside the air supply tube, temperature unevenness is likely to occur between the portion in contact with the heater wire and the portion not in contact with the heater wire, and condensation tends to occur. Since there is a concern that the breathing gas may be ignited, the heater provided outside the air supply tube has been proposed.

  In Patent Document 1, a two-layer structure consisting of an inner tube having a smooth inner surface and a serpentine outer tube covering the inner tube, and a heater wire (wire) disposed between the inner tube and the outer tube A tube (respiratory tube) is disclosed. Because of the two-layer structure of the inner tube and outer tube, the inner tube is surrounded by a heat insulation layer formed between the outer tube and the influence of the indoor atmosphere is reduced, reducing the temperature of breathing gas and causing condensation. There is an effect to prevent. In addition, since the heater wire does not touch the breathing gas directly, the risk of ignition of the breathing gas is reduced.

JP 2013-526976 A

  By the way, the air supply tube for sending the breathing gas to the patient is required to bend and expand / contract freely between the heating / humidifying device main body and the patient, but when the air supply tube described in Patent Document 1, Due to bending or expansion / contraction, the heater wire disposed between the inner tube and the outer tube may be displaced, and may be disposed at a specific location or may be disconnected.

  The present invention has been made in view of such circumstances, and even if the air supply tube is bent or expanded / contracted, the heater wire is not biased, and the respiration is sufficiently heated and humidified without causing condensation. An object of the present invention is to provide a respirating gas heating humidifier capable of stably supplying a working gas to a patient.

The respiratory gas warming humidifier of the present invention connects a warming humidifier body for warming and humidifying a breathing gas, and the warming humidifier body and a patient interface attached to a patient to connect a patient. An air feeding tube for supplying a breathing gas to the bellows-shaped inner tube, and an outer bellows-shaped outer tube surrounding the inner tube by forming a heat insulating layer between the inner tube and the inner tube. A heater having a tube and a circular arc plate fitted to a valley portion of the outer peripheral surface of the inner tube, the heater wire being wound around the outer side of the inner tube between the inner tube and the outer tube A wire holder is provided, and the arc plate has an inner peripheral edge that is longer in the circumferential direction than a semicircle of the outer peripheral surface of the valley portion of the inner tube, and a part of the heater wire is provided on the inner peripheral portion of the arc plate Holding grooves .

  This breathing gas warming humidifier has excellent flexibility as a whole because both the inner tube and the outer tube of the air supply tube are formed of a bellows-like tube that can be bent and stretched. Also, there is little stress when bent, and the inner tube is less likely to close when bent, so there are few restrictions on the installation position of the device.

In addition, this heater wire holder secures the heater wire to the desired position by fixing the heater wire to the outer peripheral surface of the inner tube so that the heater wire is not easily displaced even if the air supply tube is bent or stretched. Can be fixed.
In this case, since the heater wire holder has an inner peripheral edge that is longer in the circumferential direction than the semicircle of the outer peripheral surface of the valley portion of the inner tube, it is difficult to drop off.

In the breathing gas heating humidifier of the present invention, the heater wire holder has a posture holding member extending in a direction orthogonal to the surface direction of the arc plate on the outer peripheral portion of the arc plate, It is good if it is longer than the distance between two adjacent peak parts of the outer peripheral surface of the inner tube.
This heater wire holder prevents the circular arc plate of the heater wire holder from tilting in the gap in the valley of the inner tube by contacting the posture holding member with two adjacent peaks on the outer peripheral surface of the inner tube. This prevents the heater wire from being displaced.

  According to the respirator heating humidifier of the present invention, the air supply tube as a whole is freely bendable and extendable, so the degree of freedom in use is high, and even if the air supply tube is bent or expanded, the heater wire is displaced. Since it is not biased, it is possible to stably supply the breathing gas that has been sufficiently heated and humidified without causing condensation.

It is a longitudinal cross-sectional view of the air supply tube used for one Embodiment of the warming humidifier of the breathing gas of this invention. It is a perspective view which shows the heating humidifier of one Embodiment. It is a fragmentary sectional view showing arrangement of a heater line in this embodiment. It is a front view which shows the heater wire holder in this embodiment. It is sectional drawing which follows the BB line of FIG. It is a fragmentary sectional view which follows the CC line of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a respirating gas heating humidifier according to the present invention will be described with reference to the drawings.
The breathing gas heating humidifier 110 of the present embodiment shown in FIG. 2 is used by being connected to, for example, a CPAP device for assisting spontaneous breathing to treat a respiratory disorder. The CPAP device is a device for treating a patient using an auxiliary stimulating method called a continuous positive airway pressure (CPAP), and through a patient interface 2 such as a nasal prong, a tracheal intubation tube, and a nasal mask. Then, a breathing gas made of a mixed gas of a predetermined amount of oxygen and air is supplied to the patient. The breathing gas heating humidifier 110 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 the breathing gas. It is heated and humidified by the warming humidifier 110 and supplied to the patient.

As shown in FIG. 2, the respirator gas humidifier 110 includes a warmer / humidifier body 1 including a controller, a heater, and the like, and a chamber that is detachably provided in the warmer / humidifier body 1. 3, the breathing gas can be heated and humidified by passing the breathing gas through the internal space while heating the water accumulated in the chamber 3 with a heater. Further, the chamber 3 has a supply hose 4 for sending a breathing gas, an air supply tube 5 for sending the heated and humidified breathing gas from the chamber 3 to the patient interface 2, and a water supply for supplying water into the chamber 3 The unit 6 is connected.
As shown in FIG. 2, the breathing gas heating humidifier 110 is placed on a gantry 7 that is movable by a caster 71, and is movable together with the gantry 7. Further, although not shown in the figure, a gas supply device (for example, a CPAP device) for sending the breathing gas into the chamber 3 is connected to the warming humidifier 110 for the breathing gas.

  As shown in FIGS. 1 and 3, the air supply tube 5 has a bellows-like inner tube 20 that forms a circulation path 23 for breathing gas, and a bellows-like shape that surrounds the inner tube 20 and forms a heat insulating layer 11 that partitions the outside air. The heater wire 30 is wound around the outside of the inner tube 20, and the heater wire 30 is fixed to the outer peripheral surface of the inner tube 20 by the heater wire holder 40. The air supply tube 5 is provided with temperature sensors 70 and 80 for detecting the temperature of the breathing gas.

An inlet side socket 50 for connecting to the chamber 3 shown in FIG. 2 is provided at one end of the air supply tube 5, and an outlet side socket 60 for connecting to the patient interface 2 is provided at the other end. Is provided.
The inlet socket 50 includes a connection port 51 connected to the chamber 3, a sensor mounting port 54 for attaching the temperature sensor 70, an inner cylinder part 52 to which the inner tube 20 is connected, and an outer cylinder part to which the outer tube 10 is connected. 53 is formed integrally.
The outlet socket 60 includes a connection port 61 connected to the patient interface 2, a sensor mounting port 64 for attaching the temperature sensor 80, an inner tube part 62 to which the inner tube 20 is connected, and an outer tube to which the outer tube 10 is connected. It is set as the structure which formed the part 63 integrally.

The inner cylinder part 52 and the outer cylinder part 53 of the inlet side socket 50 are formed concentrically, and the inner cylinder part 52 communicates with the connection port 51, but the proximal ends of the outer cylinder part 53 and the inner cylinder part 52 The section is closed. The sensor attachment port 54 is provided so as to open to the connection port 51.
The outlet side socket 60 is the same as the case of the inlet side socket 50, and the inner cylinder part 62 and the outer cylinder part 63 are formed concentrically, and the inner cylinder part 62 communicates with the connection port 61. The base end portion between the cylindrical portion 63 and the inner cylindrical portion 62 is closed. The sensor attachment port 64 is provided so as to open to the connection port 61.

The inner tube 20 is formed of a bellows-like main body portion 20a in which peaks 21 and valleys 22 are alternately continued, and connection portions 20b at both ends having smooth inner surfaces having the same diameter. One of the portions 20 b is connected to the inner cylindrical portion 52 of the inlet side socket 50, and the other is connected to the inner cylindrical portion 62 of the outlet side socket 60.
The outer tube 10 is the same as the inner tube 20, and is formed of a bellows-shaped main body portion 10a composed of a peak portion 12 and a valley portion 13, and a connecting portion 10b at both ends having smooth inner surfaces having the same diameter. Yes. The outer tube 10 is provided so as to surround the inner tube 20, and a connection portion 10 b at one end thereof is connected to the outer cylinder portion 53 of the inlet side socket 50, and a connection portion at the other end. 10b is connected to the outer cylinder part 63 of the outlet side socket 60, whereby both ends of the space between the inner tube 20 and the inner tube 20 are sealed to form the heat insulating layer 11 partitioned from the outside air.
The inner tube 20 and the outer tube 10 are made of, for example, soft synthetic resin, and the outlet side socket 60 and the inlet side socket 50 are made of hard synthetic resin.

As shown in FIGS. 1 and 3, the heater wire 30 is folded in half and wound around the entire length of the inner tube 20 so as to be folded back at the end of the inner tube 20.
Both end portions of the heater wire 30 are drawn out from the inlet side socket 50 and connected to the warming humidifier body 1 via the heater wire joint connector 100. In this case as well, the heat insulating layer 11 is kept airtight. Yes.
The heater wire 30 is fixed to the inner tube 20 by the heater wire holder 40 at a plurality of locations (for example, 10 locations) with a certain interval in the longitudinal direction of the inner tube 20.

As shown in FIGS. 4, 5, and 6, the heater wire holder 40 includes an arc plate 43 that fits in the valley 22 on the outer peripheral surface of the inner tube 20, and a surface of the arc plate 43 on the outer peripheral portion of the arc plate 43. It is comprised with the attitude | position holding member 42 extended in the direction orthogonal to a direction.
The arc plate 43 has an inner peripheral edge 45 that is longer in the circumferential direction than the semicircle of the outer peripheral surface of the valley portion 22, and holds the heater wire 30 at an arbitrary position of the inner peripheral portion 46 of the arc plate 43. The holding groove 41 is formed from the inner peripheral edge 45 along the radial direction. Moreover, it has the latching claw 44 which protrudes toward inner side in the both ends of the inner periphery 45, and latches to the inner tube 20. As shown in FIG. The thickness of the arc plate 43 is set to a dimension that can be fitted into the gap of the valley portion 22 on the outer peripheral surface of the inner tube 20.

The holding groove 41 has an opening at an arbitrary position on the inner peripheral edge 45 of the arc plate 43, and extends in the radial direction from the opening, and a semicircular groove bottom is formed in the vicinity of the outer periphery. The groove width of the holding groove 41 is set to be slightly larger than the outer diameter of the heater wire 30, and the heater wire 30 can be inserted from the opening of the inner peripheral edge 45 of the arc plate 43.
The posture holding member 42 is a band-like body along the outer peripheral portion of the arc plate 43 and is provided in a direction orthogonal to the surface direction of the arc plate 43, so that the heater wire holder 40 as a whole is substantially as shown in FIG. It has a T-shaped cross section. In addition, the posture holding member 42 has a width that reaches at least the peaks 21 adjacent to the valley 22 to which the arc plate 43 is fitted, and is formed so as to cover the valley 21.
In addition, a plurality of ribs 47 are provided at intervals in the circumferential direction at the joint portion between the arc plate 43 and the posture holding member 42, so that the arc plate 43 does not fall over the posture holding member 42. Has been.

  Further, the heater wire holder 40 is entirely formed of a member such as an elastic resin. When the heater wire holder 40 is attached to or detached from the inner tube 20, the opening of the arc plate 43 can be expanded and attached or detached. When the circular arc plate 43 is fitted into the valley 22 on the outer circumferential surface of the inner tube 20, the heater wire is held by the inner circumferential edge 45 longer than the semicircle of the outer circumferential surface of the valley 22 and the locking claw 44. The tool 40 is more securely fixed to the inner tube 20.

In this case, when the heater wire 30 is fixed to the outer peripheral surface of the inner tube 20 with the heater wire holder 40, the heater wire 30 is sandwiched between the holding groove 41 and the outer peripheral surface of the inner tube 20, but the posture holding member 42 is also a mountain. The heater wire 30 is sandwiched between the unit 21.
The heater wire holder 40 prevents the circular arc plate 43 from changing its posture such as incline within the gap of the valley 22 or falling off the valley 22 even if the air supply tube 5 is bent. Thus, it is possible to prevent the heater wire 30 from being biased or misaligned.

The temperature sensors 70 and 80 for detecting the temperature of the breathing gas include an inlet side temperature sensor 70 for detecting the temperature of the breathing gas immediately after being sent out from the chamber 3 and the breathing gas just before being supplied to the patient interface 2. It is comprised by the exit side temperature sensor 80 which detects temperature.
The inlet side temperature sensor 70 is inserted into the connection port 51 from the sensor mounting port 54 of the inlet side socket 50, and the outlet side temperature sensor 80 is inserted into the connection port 61 from the sensor mounting port 64 of the outlet side socket 60, It is connected to the warming humidifier body 1 via the temperature sensor bonding connector 90.

In the control unit of the warming humidifier body 1, a heater provided in the warming humidifier body 1 based on the measurement result of the inlet side temperature sensor 70 (or the outlet side temperature sensor 80 in addition to the inlet side temperature sensor 70). The heating temperature of the heater is controlled by the difference in measured temperature between the inlet side temperature sensor 70 and the outlet side temperature sensor 80.
For example, the heat generation temperature of the heater is controlled so that the temperature of the breathing gas is in the range of 30 ° C. to 37 ° C. as measured by the inlet side temperature sensor 70, and the measurement of the outlet side temperature sensor 80 is positive with respect to the inlet side temperature The output of the heater wire 30 is controlled so as to be in the range of 33 ° C. to 40 ° C., which is 3 ° C.
The control of the outlet side temperature with respect to the inlet side temperature may be a fixed numerical value according to the length of the air supply tube 5 or may be changeable by the user. Further, the control is not necessarily performed so that the outlet side temperature is higher than the inlet side temperature, and the temperature difference is not limited to 3 ° C. For example, the user may be able to change the inlet side temperature to 37 ° C. and the outlet side temperature to 38 ° C., or the inlet side temperature to 37 ° C. and the outlet side temperature to 35 ° C. However, a temperature increase exceeding 3 ° C. with respect to the inlet side temperature is not preferable because there is a risk of heat hazard to the patient.
The outlet side temperature sensor 80 is provided with two temperature sensor circuits so that even if one of them breaks down, the other temperature sensor circuit can perform measurement.

This breathing gas warming humidifier 110 has a high degree of freedom in the installation position and the like when it is used because the air supply tube 5 is bendable and extendable as a whole.
In this case, since the heater wire 30 is fixed to the inner tube 20 by the heater wire holder 40, the winding interval of the heater wire 30 is kept constant without being biased even if the air supply tube 5 is bent or stretched. It can be heated uniformly as a whole.
Furthermore, the air supply tube 5 has a two-layer structure, and the breathing gas flowing through the inner tube 20 is not easily affected by the atmosphere in the room, and is highly effective in preventing a temperature drop and condensation.
Further, since the heater wire 30 is disposed outside the inner tube 20, the breathing gas and the heater wire 30 are not in direct contact, and even when the heater wire 30 is short-circuited for some reason. Less likely to ignite breathing gas.
Thus, the breathing gas warming / humidifying device 110 can stably supply the breathing gas that has been sufficiently heated and humidified to the patient.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various changes and modifications can be made based on the spirit of the invention described in the claims. is there.
In the embodiment, the posture holding member 42 is shown as a belt-like body, but is not limited to the belt-like body, and may be a rod-like body having a length that reaches two adjacent ridges 21 on the outer peripheral surface of the inner tube 20, for example. In that case, a plurality of circular arc plates 43 may be provided at intervals in the circumferential direction of the circular arc plate 43 at the outer peripheral portion of the circular arc plate 43.
In the embodiment, the heater wire holder 40 is shown as a single shape, but two or more adjacent heater wire holders 40 may be connected to each other by a posture holding member 42 or the like.
In the embodiment, the heater wire 30 is uniformly wound in a spiral shape. However, the heater wire 30 is not limited to a uniform shape. For example, the heater wire 30 may be tightly wound around the entrance and may be wound roughly around the exit. Although the heater wire holder 40 of the embodiment is configured by the arc plate 43 and the posture holding member 42, the posture holding member 42 may be omitted as long as it can be fixed to the inner tube 20 only by the arc plate 43. Good.
Moreover, although the example which provided this heater wire holder 40 with two or more was shown, it should just be at least one in the position of the length direction of the inner side tube 20. FIG.

DESCRIPTION OF SYMBOLS 1 Heating humidifier main body 2 Patient interface 5 Air supply tube 10 Outer tube 11 Thermal insulation layer 20 Inner tube 21 Mountain part 22 Valley part 23 Breathing gas distribution path 30 Heater wire 40 Heater wire holder 41 Holding groove 42 Posture holding member 43 Arc plate 45 Inner peripheral edge 46 Inner peripheral part 110 Respiratory gas heating humidifier

Claims (2)

A heating / humidifier body that heats and humidifies the breathing gas, and an air supply tube that connects the heating / humidifier body and a patient interface attached to the patient to supply the patient with the breathing gas. The air supply tube includes a bellows-shaped inner tube, a bellows-shaped outer tube surrounding the inner tube by forming a heat insulating layer between the inner tube, and the inner tube and the outer tube. And a heater wire wound around the outside of the inner tube ,
A heater wire holder having an arc plate that fits in a valley portion of the outer peripheral surface of the inner tube is provided, and the arc plate is an inner peripheral edge that is longer in the circumferential direction than a semicircle of the outer peripheral surface of the valley portion of the inner tube And a holding groove for holding a part of the heater wire in an inner peripheral portion of the arc plate . The heater wire holder has a posture holding member extending in a direction perpendicular to the surface direction of the arc plate on the outer peripheral portion of the arc plate, and the posture holding member is two adjacent crests on the outer peripheral surface of the inner tube. The respirator gas humidifier according to claim 1 , wherein the humidifier is longer than the distance between them.

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