JP3160164B2 - 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 having an automatic opening / closing valve which can be operated according to a respiratory cycle. Particularly preferably, the present invention relates to an oxygen-enriched gas supply device having an automatic on-off valve that can be operated according to a respiratory cycle.

[0002]

2. Description of the Related Art Conventionally, an automatic on-off valve used in oxygen therapy performed for a patient with a respiratory disease is provided inside an oxygen concentrator or in the vicinity of an oxygen-enriched gas generating means such as being incorporated in a carrier cart for an oxygen cylinder. For installation, the patient is constantly using it near the oxygen source. In the case of movement, it is necessary to move a heavy object since the movement is accompanied by an oxygen generation source, and a respiratory disease patient requires excessive labor.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a respiratory gas supply device having an automatic opening / closing valve operable in response to a respiratory cycle. The goal is to expand the range of action. In this case, in a respiratory phase detection method using a pressure signal obtained by detecting a pressure change generated with the patient's breathing (for example, see Japanese Patent Application Laid-Open No. 1-221170), the length of the respiratory gas supply conduit is increased. However, there is a problem that the detection sensitivity is reduced, and the extension distance is limited. Alternatively, simply installing an automatic open / close valve at the end of an arbitrarily extended conduit will result in an intermittent supply of respiratory gas per pulse synchronized with the respiratory cycle and an arbitrarily extended conduit length. Therefore, it is not possible to realize a pulse waveform of an amount that varies according to the prescription value. The present invention solves these problems, enables accurate detection of the respiratory phase and control of the automatic on-off valve, and allows the conduit to be arbitrarily extended without changing the supply amount of the respiratory gas, thereby enabling patients and the like to be extended. It is an object of the present invention to provide a respiratory gas supply device capable of expanding the range of action of a user.

[0004]

The respiratory gas supply device of the present invention has a respiratory gas generating means, and one end communicates with the generating means and the other end has a releasable gas supplying means. A conduit means of an arbitrary length having an automatic opening / closing valve means in the middle thereof, a respiratory phase detecting means having a function of detecting at least a part of a predetermined phase in respiration, and based on a detection result of the detecting means In a respiratory gas supply device provided with control means for controlling the opening and closing of the automatic opening and closing valve means, the automatic opening and closing valve, the detection means and the control means are installed downstream of the conduit means. In some cases, the range of action of the patient can be greatly expanded. Here, the term "downstream" means the latter half of the conduit means, and particularly preferably near the tip.

In the apparatus of the present invention, it is more preferable that the respiratory phase detecting means is provided downstream of the automatic opening / closing valve means.

The respiratory gas supply device of the present invention has a respiratory gas generating means, and one end communicates with the generating means and has a releasable gas releasing type supply means at the other end. Conduit means of an arbitrary length having on-off valve means, respiratory phase detecting means having a function of detecting at least a part of a predetermined phase in respiration, and the automatic on-off valve based on a detection result of the detecting means In the respiratory gas supply device provided with a control means for controlling the opening and closing of the means, a throttle mechanism such as an orifice and a reservoir mechanism such as a cushion tank are connected in series near the upstream side of the automatic opening / closing valve, more specifically, immediately before. Includes those installed in As a result, the change in the supply pattern of the respiratory gas due to the arbitrarily lengthened conduit length is reduced, and the detection of the respiratory phase and the control of the automatic on-off valve can be performed accurately.

Further, the respiratory gas supply device of the present invention includes:
A breathing gas generating means, an arbitrary length of conduit means having one end communicating with the generating means, the other end having a release type supply means for the breathing gas, and an automatic opening / closing valve means on the way; Respiratory phase detecting means having a function of detecting at least a part of the predetermined phase in the above, and control means for controlling the opening and closing of the automatic opening and closing valve means based on the detection result of the detecting means In the supply device, the throttle mechanism includes a plurality of devices having a dimensional value suitable for the amount of gas to be supplied, and a device that can be used by switching according to a gas flow target value. A mechanism using a conduit having a dimension having an equivalent volume is also included.

Further, the present invention has a means for generating breathing gas, one end communicating with the generating means, a release type supply means for breathing gas at the other end, and an automatic opening / closing valve means on the way. Conduit means having an arbitrary length, 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 respiratory phase detecting means. In a respiratory gas supply device provided with control means for controlling, the automatic on-off valve, the respiratory phase detecting means, and the control means are provided upstream of the conduit means, and the automatic on-off valve A respiratory gas supply device characterized in that a throttle mechanism and a reservoir mechanism are installed upstream of the apparatus. Here, upstream means the first half of the conduit means,
Preferably, an air concentrator such as an oxygen concentrator housed in a housing housing gas generating means for breathing is used.

Preferred examples of these devices include those 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. Examples of the oxygen concentrator include an adsorption-type oxygen concentrator using an adsorbent capable of selectively adsorbing nitrogen and a membrane-type oxygen concentrator using an oxygen-permeable membrane.

[0010] The open-type supply means in the present invention supplies respiratory gas in an unsealed state to the patient's nostrils or mouth, that is, in a state of being opened to the atmosphere, and is exemplified by a nasal cannula. .

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.
Pneumatically operated automatic 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. Particularly, DC excitation type solenoid valves are practical. It is a target.

As the respiratory phase detecting means, any means can be used as long as it can detect the expiration and the cycle of expiration during respiration. As a specific example, there is a means for detecting a value that changes based on breathing such as pressure, temperature, humidity, and the like relating to exhalation and an airflow in an exhalation 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 pressure fluctuation, there is 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 inhalation pass. Some diaphragm-type minute pressure fluctuation detecting means uses a metal material such as stainless steel. In addition, a polymer film which is surface-treated with a conductive substance for measuring pressure or differential pressure based on a change in capacitance is used as a diaphragm (Japanese Patent Application Laid-Open No. 64-213).
No. 30). 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 multiple ends opened in the nostrils and the like may be provided separately from conduit means for supplying breathing gas to the nostrils and the like, but both functions are provided. It may be provided on a single conduit means.

As a means for detecting a temperature change, there is a means in which a temperature detecting member such as a thermocouple is disposed in a passage for exhalation and inhalation, that is, in a respiratory airflow.

Among them, the pressure fluctuation detecting means is convenient because the fluctuation can be detected at a position away 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 breath detected by the respiratory phase detecting means includes a time when inhalation starts, a time when exhalation starts, 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 association with inspiration.

In the normal operation, the respiratory gas supply device of the present invention opens and closes the automatic opening / closing means provided in the middle of the respiratory gas supply conduit based on the detection result by the respiratory phase detecting means. The respiratory gas is intermittently supplied in a part of the inspiratory phase.

A feature of the respiratory gas supply device of the present invention is that when an arbitrarily extended conduit is used to extend the range of action of a user, a respiratory phase detection method using a pressure signal (Japanese Patent Laid-Open No. 1-221170). In Japanese Patent Application Laid-Open Publication No. H10-157, there is provided a means for preventing the detection sensitivity from lowering and making it difficult to supply gas accurately. In the apparatus of the present invention, a water surface evaporation type humidifier may be provided on the downstream side of the portion where the pressure fluctuation sensor for detecting the respiratory phase is installed, so that the humidifier can be used as needed.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a breathing gas supply apparatus according to the present invention. However, the present invention is not limited to these examples.

In FIG. 1, oxygen from an oxygen generating means 1 comprising a pressure fluctuation adsorption type oxygen concentrating means is supplied to a pressure fluctuation detecting a respiratory phase by detecting a pressure fluctuation via an orifice throttle mechanism 2 and a tank mechanism 3. It passes through the demand valve 4 controlled by the demand valve controller 6 based on the detection result of the sensor 5. Furthermore, the extension tube 7
Through the open-type supply means of the nasal cannula 8.

The present apparatus is characterized in that a sensor 5, a demand valve controller 6 and a demand valve 4 are installed on the upstream side of the extension tube 7, and these are housed inside a housing 9 serving as an oxygen concentrator. I have. still,
The description of the pressure fluctuation adsorption type oxygen concentrating means itself housed in the housing 9 is omitted in FIG.

FIG. 2 shows that the oxygen generated by the oxygen generating means 11 is supplied to the demand valve controller 16 based on the detection results of the throttle mechanism 12, the tank mechanism 13 and the sensor 15 provided near the tip of the extension tube 17 having an arbitrary length. It passes through a controlled demand valve 14. Further nasal cannula 1
8 from the release means.

The present apparatus is characterized in that a sensor 15, a demand valve controller 16 and a demand valve 14 are provided downstream of the extension tube.

FIG. 4 shows the amount of oxygen supply per pulse when actually measured by the apparatus shown in FIG. In other words, when the conventional throttle mechanism and tank mechanism are not installed, if the extension tube is lengthened, the oxygen supply amount per pulse is clearly changed, and an accurate pulse waveform is supplied by an arbitrary extension tube length. Can not. On the other hand, by providing the throttle mechanism and the tank mechanism of the present invention, the oxygen supply amount per pulse becomes constant regardless of the length of the extension tube, and an accurate pulse waveform can be supplied. As a result, the present invention has an advantage that the range of action of the user is greatly expanded.

FIG. 3 shows that the oxygen generated from the oxygen generating means 21 is supplied through an extension tube 27 of an arbitrary length to a throttling mechanism 22.
2 and a predetermined length of tube 23 downstream of the tank mechanism 13 in FIG. Further, it is supplied from the release means of the nasal cannula 28 through the demand valve 24 controlled by the demand valve controller 26 based on the detection result of the respiration phase detection means 25.

In this case, the tube 23 of a predetermined length has the function of the reservoir means of the present invention and has substantially the same volume as the reservoir mechanism.

As described above, in the device of the present invention, a device in which the throttle means and the storage means are arranged in series upstream of the demand valve is preferably used, and particularly those as shown in FIGS.

[0028]

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 required gas supply amount can be accurately obtained even if the conduit is arbitrarily extended. Has an excellent effect. In addition, the duct can be arbitrarily extended, and the range of action of the user can be greatly expanded.

[Brief description of the drawings]

FIG. 1 is a schematic illustration of a breathing gas supply device.

FIG. 2 is a schematic illustration of a preferred embodiment of the respiratory gas supply device of the present invention.

FIG. 3 is a schematic illustration of a preferred embodiment of the respiratory gas supply device of the present invention.

FIG. 4 illustrates the relationship between the extension tube length and the oxygen supply pattern per pulse in the case of the breathing gas supply device of the present invention illustrated in FIG. 2 and without the throttle mechanism and the tank mechanism in the device. What you did.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-200116 (JP, A) JP-A-4-303456 (JP, A) Patent 2656530 (JP, B2) WO 93/25260 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61M 16/00

Claims (4)

(57) [Claims] 1. A generating means of breathable gas, and the conductive tube means having an automatic opening and closing valve means in the middle one has a release-type supply means of the breathing gas to the other end communicating with the emitting generating means A respiratory phase detector having a function of detecting at least a part of a predetermined phase in respiration, and a controller for controlling opening and closing of the automatic on-off valve based on a detection result of the respiratory phase detector. Generating means,
Conduit means for communicating with the automatic on-off valve means is at least
Conduit means having a length of at least 3 m, wherein said automatic on-off valve
A respiratory gas supply device comprising a throttle means and a storage means near the upstream side of the means . 2. The communication between said generating means and said automatic opening / closing valve means.
That the conduit means is a 3-33m extension tube.
The respiratory gas supply device according to claim 1, wherein: 3. The throttle means is provided with a plurality of throttle mechanisms having dimensions corresponding to the amount of gas to be supplied, and can be switched and used in accordance with a target gas flow rate. 3. The respiratory gas supply device according to 2. 4. The respiratory gas supply device according to claim 1, wherein the storage means is a storage mechanism or a conduit having a size substantially equal to the storage mechanism.