JPH0623051A - Heating/humidifying apparatus - Google Patents

Abstract

PURPOSE:To achieve higher safety by arranging a hose heater in a hose for connecting an airway of an organism to the main body of a heating/humidifying apparatus and a constant power supply means to supply a fixed power to the hose heater without depending on a resistance value of the hole heater. CONSTITUTION:An airway Pa of a patient P is connected to the body 2 of the apparatus with an inhaling hose 30 and the airway Pa is connected to an artificial respirator with an exhaling hose 31. A water trap is provided at an intermediate part of the exhaling hose 31 and a hose heater 32 is arranged in the inhaling hose 30. A mouth piece 30a at the tip of the exhaling hose 30 is provided with a temperature sensor 34 and a connection pipe 35 with which an inlet 30b of the inhaling hose 30 is connected to a steam discharge port 21a of a chamber 21 is provided with a temperature sensor 36. A constant power control performed by a CPU40a is based on a resistance value of the hose heater 32 detected with a resistance value detecting section 41 and a power value to be supplied to the hose heater 32 is determined searching a memory 40c. Thus. the power value is converted to a voltage value to perform a constant power control so that the power reaches a fixed value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating / humidifying device for heating / humidifying gas discharged from an artificial respiration device and supplying it to the respiratory tract of a living body (mainly a patient).

[0002]

2. Description of the Related Art In a heating and humidifying device of this type, a gas supplied from an artificial respiration device to a patient's airway via a hose (also called a breathing circuit) has an appropriate temperature (for example, a temperature of 35%) at the entrance of the patient's airway. This is a device for heating and humidifying the gas so that the gas has an appropriate humidity (for example, 95% humidity).

The proper humidification of the gas is carried out by heating the water in the chamber (evaporation container) with a plate heater to generate steam and sending the steam to a hose, and also to optimize the temperature of the gas. Is performed by applying a constant voltage (for example, DC 20V) to the hose heater arranged in the hose to heat the hose heater.

Further, the hose heater and the hose can be replaced individually or integrally as a whole in case of damage or due to sanitary problems.

[0005]

However, since the hose heater is not standardized and its resistance value is not constant by fluctuating 11 to 38 Ω with respect to the reference value 19 Ω, for example, A power fluctuation of 13 to 44 W occurs with respect to the value of 26 W, and when the hose heater is replaced, the fluctuation of the resistance value causes various adverse effects. That is, if the resistance value of the hose heater is too lower than the reference value, the amount of heat generated increases and the hose melts, causing a burn to the patient or blowing the fuse. Further, if the resistance value is too high, the temperature inside the hose cannot be raised, and dew condensation occurs, water remains in the hose, and fluctuations in the airway pressure and water flow into the patient side.

Therefore, the present invention prevents the above-mentioned harmful effects,
It is an object of the present invention to provide a heating / humidifying device with improved safety.

[0007]

In order to achieve the above object, the heating / humidifying device according to claim 1 heats and humidifies the gas discharged from the artificial respiration device and supplies it to the respiratory tract of a living body. In the heating / humidifying device, a hose connecting the airway of the living body to the device body of the heating / humidifying device, a hose heater arranged in the hose, and a constant hose heater regardless of the resistance value of the hose heater. And a constant power supply means for supplying the power of.

Further, in the heating / humidifying device according to claim 2, the constant power supply means includes a power source section for applying a variable voltage to the hose heater, and a resistance value detecting section for detecting a resistance value of the hose heater. And a control means for controlling the output voltage of the power supply unit so as to supply a constant electric power to the hose heater based on the resistance value detected by the resistance value detection unit. is there.

[0009]

According to the heating and humidifying device of the first aspect, the constant power supply means supplies a constant power to the hose heater even when the hose heater is replaced with one having a different resistance value. Thereby, stable heating of the gas supplied to the respiratory tract of the living body can be performed.

According to the heating and humidifying device of the second aspect, the control means of the constant power supply means supplies constant power to the hose heater based on the resistance value of the hose heater detected by the detection means. Since the output voltage of the power supply unit is controlled, it is possible to perform stable heating of the gas supplied to the respiratory tract of the living body, as in the first aspect.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a heating / humidifying device of the present invention, FIG. 2 is a front view of an operating portion 23 thereof, and FIG. 3 is a schematic block diagram showing its control system.

As shown in FIG. 1, the heating / humidifying device 1 of this embodiment has a device body 2 and a hose heater assembly 3 as shown in FIG.
And a constant power supply means 4 for supplying a constant power to the hose heater 32 described later.

As shown in FIG. 1, the apparatus body 2 comprises a chamber (evaporation container) 21 and a heater base 22. The chamber 21 has a steam discharge hole 21a at the upper end, and an air input port 21b at the side, which is connected to an artificial respirator (not shown) by a hose. The heater base 22 includes an operation unit 23 and a power ON / OFF switch 24 on the side surface.

As shown in FIG. 1, the hose assembly 3 includes an intake hose 30 connecting the airway Pa of the patient P and the apparatus main body 2, and an exhalation hose 31 connecting the airway Pa of the patient P and the artificial respiration device. A water trap 33 provided at an intermediate portion of the exhalation hose 31, a hose heater 32 disposed in the intake hose 30, and a first temperature sensor (also referred to as an airway probe) provided on the mouthpiece 30a at the tip of the exhalation hose 30. 34), a connection pipe 35 that connects the inlet 30b of the exhalation hose 30 and the vapor discharge hole 21a of the chamber 21, and a second temperature sensor 36 provided in the connection pipe 35.

The intake hose 30 and the exhalation hose 31 are prepared to have different sizes (for example, 22 mm and 10 mm). Since the adult and child have different tidal volumes, a hose with a large diameter is generally used when the patient P is an adult, and a hose with a small diameter is used when the patient P is a child. Therefore, the hose heater 32 that keeps the gas passing through the intake hose 30 warm
Also, the rating varies depending on the diameter of the intake hose 30 used, that is, the space to be kept warm (for example, 40 W, 20 W).
W) are prepared separately.

As shown in FIG. 2, the operation unit 23 of the apparatus main body 2 has an airway probe temperature display 23a, a temperature setting / alarm set value display 23b, a temperature setting change button 23c, and an alarm set value change button 23d. , Temperature setting / alarm setting UP button 23e, temperature setting / alarm setting DOWN
It is provided with an N button 23f, a heater ON / OFF indicator 23g, a humidification amount control knob 23h, an alarm mute button 23i, an empty chamber alarm 23j, and a temperature rise / fall alarm 23k.

The temperature setting change button 23c is used for the airway P of the patient P.
The temperature setting change button 23c is used to change the initial set temperature (for example, 35 ° C.) of the gas supplied to a.
The desired temperature can be changed by pressing the temperature setting / alarm setting UP button 23e or the temperature setting / alarm setting DOWN button 23f while pressing. The initial setting temperature or the changed temperature is the temperature setting /
The alarm set value display 23b is displayed.

The alarm set value change button 23d is used to change the initial alarm set value (for example, ± 4 ° C.) at which the alarm operates, and the alarm mute button 23i.
After pressing once to confirm that the airway probe temperature indicator 23a becomes "AL", change the temperature setting button 2
Temperature setting / alarm setting UP button 23 while pressing 3c
By pressing e or the temperature setting / alarm setting DOWN button 23f, the desired alarm set value can be changed. And temperature rise / fall alarm 2
For example, when the set temperature is 35 ° C. and the alarm set value is 4 ° C., the alarm sound is generated when the temperature of the first temperature sensor 34 exceeds 39 ° C. or falls below 31 ° C. It is supposed to occur.

The humidifying amount control knob 23h is used to change the initial set humidity (for example, 95%) of the supply gas, and when the knob 23h is turned to the right, the temperature of the plate heater 25, which will be described later, lowers and humidifies. When the amount increases and the knob 23h is turned counterclockwise, the temperature of the plate heater 25 rises and the amount of humidification decreases.

The empty-chamber alarm 23j generates an alarm sound when the water in the chamber 21 is exhausted, and informs that.

The constant power supply means 4, as shown in FIG. 3, controls the temperature and humidity of the gas supplied to the airway Pa of the patient P and controls the constant power of the hose heater 32.
0, a resistance value detection unit 41 such as a resistance meter for detecting the resistance value of the hose heater 32, and a power supply unit 43 having a variable output voltage.

The control means 40 includes a CPU 40a for controlling each section of the apparatus 1, a program memory 40b in which a control program is stored, and data necessary for controlling each section of the apparatus 1 (initial set temperature, initial alarm). Set value,
(Initial setting humidity, constant power control information shown in Fig. 4 described later, etc.)
And a memory 40c in which is stored. CPU4
The first temperature sensor 34, the second temperature sensor 36, the resistance value detection unit 41, the operation unit 23, the program memory 40b, the memory 40c, and the power supply unit 43 are connected to 0a. Further, the hose heater 32 and the plate heater 25 arranged in the heater base 22 of the apparatus main body 2 are connected to the power supply section 43. This plate heater 2
5, the voltage is applied from the power supply unit 43, and the chamber 21
The water (distilled water) therein is heated at a predetermined temperature to generate steam. The CPU 40a, the first temperature sensor 34, the second temperature sensor 36, and the resistance value detection unit 4
1 and the operation unit 23, a multiplexer (MPX)
May be provided, and the input signal to the CPU 40a may be switched by the multiplexer.

The temperature control performed by the CPU 40a is performed by the memory 4
0c initial setting temperature or temperature setting change button 23
c, the hose so that the temperature of the first temperature sensor 34 becomes the set temperature based on the temperature information set by operating the temperature setting / alarm setting UP button 23e or the temperature setting / alarm setting DOWN button 23f. The output voltage of the power supply unit 43 applied to the heater 32 is controlled.

The humidity control performed by the CPU 40a is performed by the memory 4
The temperature difference between the first temperature sensor 34 and the second temperature sensor 36 corresponds to the set humidity based on the information of the humidity set by the operation of the initial set humidity or the humidification amount control knob 23h stored in 0c. The output voltage of the power supply section 43 applied to the plate heater 25 is controlled so as to obtain the above value. Since the humidity control is performed by the temperature difference between the first temperature sensor 34 and the second temperature sensor 36, it is possible to obtain the supply gas with accurate humidity.

The constant power control performed by the CPU 40a is based on the resistance value of the hose heater 32 detected by the resistance value detecting section 41, and the power value supplied to the hose heater 32 is stored in the memory 40.
It is performed by searching for c, converting the power value into a voltage value, and transmitting a signal of the voltage value to the power supply unit 43. Then, the power supply unit 43 applies a voltage according to the voltage value signal transmitted from the CPU 40a to the hose heater 32. For example, when the resistance value of the hose heater 32 detected by the resistance value detection unit 41 is lower than the lower limit value (for example, 10Ω) R1 or higher than the upper limit value (for example, 40Ω) R2 as shown in FIG. 4, an alarm is activated. , Or a message is displayed to inform the operator that the vehicle is out of the control range. Further, the detected resistance value is the lower limit value R
When the value is between 1 and a reference value (for example, 19Ω) R0, that is, in the case of a child intake hose 30, constant power control is performed so that the power is 20 W, and the detected resistance value is the upper limit value R2 and the reference value. When the value is between R0, that is, in the case of the adult intake hose 30, the constant power control is performed so that the power becomes 40W. The constant power control is performed by the intake hose 3
Depending on the type of 0, etc., the control may be performed in three or more steps other than the two-step control shown in FIG.

Next, the operation of this embodiment having the above structure will be described.

The heating and humidifying device 1 and the artificial respiration device are connected by a hose (not shown), and the airway Pa of the patient P and the heating and humidifying device 1 are connected by a hose assembly 3. To do.

First, the operator turns on the power source O of the apparatus main body 2.
When the N / OFF switch 24 is turned ON to start the device 1, the CPU 40a of the control means 40 reads the control program from the program memory 40b based on the starting operation and sets each part of the device 1 to the initial state. To do. The resistance value detection unit 41 uses the CP when setting the initial state.
Under the control of U40a, the resistance value of the hose heater 32 is detected, and the detection result is sent to the CPU 40a. CPU40
a is a hose heater 32 sent from the resistance value detection unit 41
The memory 40c is searched based on the resistance value information to obtain the power value supplied to the hose heater 32, and the voltage value obtained by converting the power value is obtained.

Next, the CPU 40a performs temperature control and humidity control as described above on the basis of the control program read from the program memory 40b to heat / humidify the gas discharged from the artificial respiration device.

The CPU 40a transmits a signal corresponding to the previously obtained voltage value to the power supply unit 43 during temperature control. The power supply unit 43 applies a voltage according to the voltage value signal transmitted from the CPU 40a to the hose heater 32. The hose heater 32 generates heat and keeps the gas supplied to the patient P warm.
As a result, the gas of appropriate temperature and humidity is supplied to the airway Pa of the patient P.

According to the above embodiment, the following effects can be obtained.

(1) Since constant power is supplied to the hose heater 32 irrespective of the resistance value of the hose heater 32, various adverse effects due to fluctuations in the resistance value can be prevented and safety is improved. It is possible to provide the heating and humidifying device 1.

(2) Since various adverse effects due to fluctuations in the resistance value of the hose heater 32 can be prevented, the heating / humidifying device 1
It is possible to freely change the length of the intake hose 30 according to the installation conditions.

The present invention is not limited to the above embodiment,
Various modifications can be made without changing the gist of the invention.

[0036]

According to the invention described in claim 1, which has been described in detail above, a constant electric power is supplied to the hose heater regardless of the resistance value of the hose heater. It is possible to provide a heating / humidifying device capable of preventing harmful effects and improving safety.

According to the second aspect of the invention, similarly to the first aspect, it is possible to provide a heating / humidifying device with improved safety.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a heating / humidifying device of the present invention.

FIG. 2 is a front view of an operation unit according to the present embodiment.

FIG. 3 is a schematic block diagram showing a control system of this embodiment.

FIG. 4 is a graph showing an example of constant power control information stored in a memory of this embodiment.

[Explanation of symbols]

 1 Heating / Humidifying Device 4 Constant Power Supply Means 30 Intake Hose 32 Hose Heater 40 Control Means 41 Resistance Value Detection Section

Claims (2)

[Claims] 1. A heating / humidifying device for heating / humidifying a gas discharged from an artificial respiration device and supplying it to an airway of a living body, wherein the airway of the living body is connected to a device body of the heating / humidifying device. A heating / humidifying device comprising: a hose, a hose heater arranged in the hose, and constant power supply means for supplying a constant power to the hose heater regardless of the resistance value of the hose heater. 2. The constant power supply means includes a power supply section for applying a variable voltage to the hose heater, a resistance value detection section for detecting a resistance value of the hose heater, and a resistance value detected by the resistance value detection section. And a control means for controlling the output voltage of the power supply section so as to supply a constant electric power to the hose heater.