JP2790625B2 - Respiratory gas supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a respiratory gas supply device provided with an automatic on-off valve operable according to a respiratory cycle. Particularly preferably, the present invention relates to an oxygen-enriched gas supply device using a pressure fluctuation adsorption-type oxygen concentrator, which is provided with an automatic on-off valve that can be operated according to a breathing cycle.

[0002]

2. Description of the Related Art Conventionally, oxygen therapy has been performed by inhaling oxygen from an oxygen cylinder for a patient with respiratory disease. In particular, recently, oxygen therapy in order to obtain oxygen-enriched gas by concentrating oxygen in the air has been performed. Since oxygen concentrators have been developed and put into practical use, oxygen therapy using the oxygen concentrators has become increasingly popular.

[0003] Such oxygen concentrators are broadly classified into adsorption-type oxygen concentrators of the pressure fluctuation type or the like in which adsorption and desorption are repeated by changing the pressure in an adsorption tower packed with an adsorbent which more easily adsorbs nitrogen such as zeolite. And two types of membrane oxygen concentrators using an oxygen selective permeable membrane.-When supplying oxygen-enriched gas obtained by these oxygen concentrators to patients with respiratory diseases, extend the normal concentrator. A method of continuously introducing into a patient's nostril from a nasal cannula provided at the end of the tube is adopted. In addition, as an improved supply system, it is possible to supply oxygen-enriched gas only during inhalation in response to the patient's respiratory cycle, thereby preventing wasteful oxygen-enriched gas release and improving efficiency. (Japanese Patent Laid-Open No. 59-8972).

[0004]

SUMMARY OF THE INVENTION The present invention relates to a respiratory gas supply device provided with an automatic on-off valve which can be operated according to a respiratory cycle, and which can sufficiently cope with abnormalities in respiration of a patient. It is intended to provide a device with enhanced sex.

[0005] Particularly, when the breathing of the patient is temporarily weakened, an excellent function of reliably supplying the breathing gas to the patient's nasal cavity to reinforce the patient's breathing and ensure safety. Another object of the present invention is to provide a respiratory gas supply device having a function of reducing the consumption of respiratory gas while securing the supply of a required amount of respiratory gas.

[0006]

As a result of diligent studies conducted by the present inventors, the present inventors have found that the respiratory gas supply device described below solves such a problem.

The respiratory gas supply device of the present invention has a respiratory gas generating means and an open-type respiratory gas supplying means having one end communicating with the generating means and the other end having an automatic on-off valve. Conduit means having means V ₀ , respiratory phase detecting means having a function of detecting at least a part of a predetermined phase in respiration, and opening and closing of the automatic opening / closing valve means V ₀ based on a detection result of the detecting means In the respiratory gas supply device equipped with control means for controlling the
A respiratory gas supply device having a flow rate reducing means for reducing a supply flow rate is exemplified.

The respiratory gas supply device of the present invention has a respiratory gas generating means and an open-type respiratory gas supplying means having one end connected to the generating means and the other end. Conduit means having on-off valve means V ₀ , respiratory phase detecting means having a function of detecting at least a part of a predetermined phase in respiration, and automatic on-off valve means V ₀ based on a detection result of the detecting means In the respiratory gas supply device provided with control means for controlling the opening and closing of, when switched to continuous supply, having a flow rate reducing means for reducing the supply flow rate,
The flow rate reducing means includes a flow path restricting means and an automatic opening / closing valve means V _1.
A respiratory gas supply device, characterized in that it is a bypass means having:

Further, the breathing gas supply device of the present invention includes:
A generating means of the breathing gas, and conduit means having one end having an automatic on-off valve means V ₀ in the middle has an open supply means of the breathing gas to the other end communicating with the emitting generating means, the at least one in the respiratory a respiratory phase detecting means having a function capable of detecting a predetermined phase parts, said sensing means sensing result breathing gas supply having a control means for controlling the opening and closing of the automatic opening and closing valve means V ₀ based on the in the device, when switching to the continuous supply, has a flow reduction means for reducing the supply flow rate, the flow rate lowering means is automatic opening and closing valve means V ₂ on the upstream side or downstream side of the automatic opening and closing valve means V ₀ it has, and include breathing gas supply apparatus characterized by having a bypass means having a flow restriction means and the automatic opening and closing valve means V ₁ so as to bypass the automatic opening and closing valve means V _2.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a preferred example of such an apparatus, there is provided a means for generating breathing gas, and an open type supply means for breathing gas having one end communicating with the generating means and the other end thereof. Conduit means having valve means V, respiratory phase detecting means having a function of detecting at least a part of a predetermined phase in respiration, and opening / closing of the automatic opening / closing valve means based on a detection result of the detecting means. a respiratory gas supply device comprising a control means for controlling, when said detecting means does not detect the next said predetermined constant phase until after a predetermined time T ₁ elapses from the detection of the said predetermined constant phase, said control means the automatic opening and closing valve means are those that have to open continuously after said predetermined constant-time T ₁ has elapsed, the bypass means having a flow path throttling means and an automatic on-off valve means V _1, open supply from generating means by Intermittent in conduit to means Wherein the diversion automatic opening and closing valve means V ₀
A separate automatic on-off valve means V provided at the downstream or upstream side of the pipe and between the inlet and the outlet of the bypass means.
There are some that are equipped with ₂ .

A preferred example of these devices is one in which the respiratory gas is oxygen or oxygen-enriched gas, and the means for generating the gas is an oxygen concentrator, an oxygen cylinder, or a liquid oxygen storage tank. In particular, those using a pressure fluctuation adsorption type oxygen concentrator as a generating means can be advantageously used practically.

The open-type supply means in the present invention supplies respiratory gas in a state where it is not sealed with respect to a patient's nostrils and mouth, that is, in a state where it is open to the atmosphere. For example, a nasal cannula is exemplified. Can be

The automatic opening / closing valve means is preferably a DC-excited solenoid valve, an AC-excited solenoid valve, an air-operated automatic valve, a pilot-operated solenoid valve, or the like.
Air-operated solenoid valves, pilot-operated solenoid valves, etc. have a slow movement of the iron core, etc., have a long life, are low in noise generated during operation, and are more preferable in terms of noise reduction measures. is there.

As the respiratory phase detecting means, any means can be used as long as it can detect the cycle of expiration and inspiration during breathing. As a specific example, there is a means for detecting a value that changes based on breathing, such as pressure, temperature, and humidity, related to an airflow in an expiration and inspiration passage. Other examples include those based on gas flow characteristics such as fluid logic elements.

There are two types of pressure-based detection means: one for detecting pressure fluctuations and one for measuring pressure itself.
The former is practically preferable, and the one that detects the rate of change of pressure is particularly effective in increasing the sensitivity. As a means for detecting the pressure fluctuation, for example, a pressure fluctuation detecting means using a diaphragm or the like in a conduit having an opening in a nostril or the like, which is a passage through which expiration and inspiration passes, may be mentioned. Some diaphragm-type minute pressure fluctuation detecting means use a metal material such as stainless steel, and others are described in Japanese Patent Application No. 62-175982 previously filed by a part of the present inventors. Examples of the diaphragm include a polymer film surface-treated with a conductive substance for measuring pressure or differential pressure based on a change in capacitance. In particular, in the case of a detecting means using such a polymer film as a diaphragm, it is suitable for detecting a fluctuation of a small pressure or a small differential pressure of about several mmAq. The conduit communicating with the space on one surface side of the diaphragm and having the other end open in the nostril may be provided separately from conduit means for supplying respiratory gas to the nostril. May be provided on a single conduit means.

Means for detecting temperature fluctuations include a means for placing a temperature sensing member, such as a thermocouple, in a passage for exhalation and inhalation, that is, in a respiratory airflow. Further, as an example of the means for detecting a change in temperature, an example using a thermometer can be given.

Among these, the pressure fluctuation detecting means is convenient because the fluctuation can be detected at a position distant from the respiratory airflow such as a nostril. In particular, the conduit means for detecting the pressure fluctuation supplies the breathing gas. There is an advantage that can be shared with the conduit means for carrying out.

The predetermined phase of at least a part of the respiration detected by the respiration phase detecting means includes the time of inhalation start, the time of expiration start, and the like. In particular, detection of the start of inspiration as a predetermined phase is practically advantageous because the supply of breathing gas can be stably performed in response to inspiration.

The breathing gas supply apparatus of the present invention, in the normal operation, based on the detection result by the respiratory phase detecting means, performing the opening and closing of the automatic opening and closing valve means V ₀ provided in the middle of the breathable gas supply conduit Thus, the respiratory gas is intermittently supplied at least in part of the inspiratory phase.

A feature of the apparatus of the present invention is that when the apparatus is in use, if the user's breathing is temporarily weakened or the breathing detection means is disengaged, the phase in the breathing cycle cannot be detected. , that was allowed comprising means for preventing becomes impossible supply of breathing gas from the conduit means in a state of leaving the automatic opening and closing valve means V ₀ which during the breathing gas supply conduit means is closed is there.

That is, a feature of one example of the respiratory gas supply means according to the present invention is that, after the respiratory phase detecting means detects a predetermined phase such as at the start of inspiration, a predetermined time T ₁ elapses. if the predetermined phase in the respiratory cycle is not detected, after which time T _1, is automatically continuously to the open state by the control unit an automatic open-close valve unit V _0. When switching to continuous supply, it is more advantageous to provide a means for reducing the flow rate to be supplied, because the supply of the required amount of breathing gas is secured and the consumption of breathing gas is reduced. In particular, in the case of an adsorption type oxygen concentrator, there is an advantage that the oxygen concentration can be easily maintained at a high level.

[0022] The automatic for intermittent operation in conduit means as specific means therefor, the bypass means having a flow path throttling means and automatic opening and closing valve V ₁ of the example orifice such as to open the supply means from the generating means include those in which a different automatic opening and closing valve means V ₂ in the conduit means between the inlet and outlet of the and the bypass means provided on the downstream side or upstream side of the on-off valve means V _0. That is, in this case, V ₂ when V ₀ are continuously opened closed, their automatic opening and closing valve by the control means so that V ₁ is opened is controlled. Note that V
₀ in the case of normal operation to open and close in response to the breathing cycles should be in the state where V ₂ is V ₁ opened is closed.

It is practically advantageous to provide a humidifying means in the middle of the bypass means for humidifying the breathing gas passing therethrough.

As one specific example of a preferred embodiment of the means for generating respiratory gas of the present invention, at least one adsorption bed filled with an adsorbent for selectively adsorbing nitrogen gas is pressurized to the adsorption bed. A compressor means for inflowing air, and a conduit means in the enricher for taking out oxygen-enriched air from the adsorbent bed and flowing it to an outlet;
A pressure-fluctuation adsorption type oxygen enricher in which more than one adsorption bed is operated so as to repeat a pressurization-decompression cycle singly or alternately. It is preferable that any of the oxygen-enriched gas generating means has a means for adjusting the flow rate of the oxygen-enriched air to be used. In this case, for example, a flow rate setting unit that includes a plurality of openings having different hole diameters and selects the openings to set the flow rate, and a combination of a normal rotor meter type flow meter and the flow rate setting device, facilitate the flow rate setting, and This is practically advantageous because the flow state of the gas can be easily confirmed.

In the case of the present invention, the supply of breathing gas is intermittent in the normal operation mode, so that it is not necessary to use a special humidifier. However, it is practically advantageous to provide humidifying means when switching to continuous supply.

[0026]

The respiratory gas supply device of the present invention is provided with an automatic opening / closing valve that can be operated according to the respiratory cycle, so that the respiratory gas can be reliably supplied even when the user's breathing is weakened. It has an excellent effect that can be supplied. Further, it is advantageous because the consumption of the respiratory gas can be reduced while the supply of the required amount of the respiratory gas is secured. Particularly, in the case of the adsorption type oxygen concentrator, there is an advantage that the oxygen concentration can be easily maintained at a high level.

────────────────────────────────────────────────── (5) References JP-A-59-8972 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61M 16/00 305

Claims (6)

(57) [Claims] 1. A generating means of breathing gas, and conduit means having one end having an automatic on-off valve means V ₀ in the middle has an open supply means of the breathing gas to the other end communicating with the emitting generating means includes a respiratory phase detecting means having a function capable of detecting at least a portion of the predetermined phase in the breathing, control means for controlling the opening and closing of the automatic opening and closing valve means V ₀ based on the detection result of said detecting means A respiratory gas supply device, characterized in that it has a flow rate reducing means for reducing the supply flow rate when switching to continuous supply. Wherein the flow rate lowering means is, breathing gas supply apparatus according to claim 1, characterized in that the bypass means comprising a and automatic opening and closing valve means V ₁ passage throttling means. 3. an automatic on-off valve means V ₂ on the upstream side or downstream side of the automatic opening and closing valve means V _0, and flow restriction means and the automatic opening and closing valve so as to bypass the automatic opening and closing valve means V ₂ breathing gas supply apparatus according to claim 1 or 2, characterized in that had a bypass means comprising means V _1. Wherein the automatic opening and closing valve means V ₁ when the automatic opening and closing valve means V ₀ is opened continuously opens, the automatic opening and closing valve means V
4. The respiratory gas supply device according to claim 3, wherein ₂ is closed. 5. The respiratory gas supply device according to claim 1, wherein said bypass means includes a humidifying means. 6. The respiratory gas supply device according to claim 1, wherein said respiratory gas generating means is an adsorption type oxygen concentrator.