JPS6257564A - Respiration detecting gas inhalator in nose - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of a nasal glasses-shaped cannula (gas introduction tube) equipped with a sensor for detecting a respiratory signal.

(Prior Art) Methods for inhaling gas such as oxygen into a patient can be roughly divided into closed type and open type. The closed type uses a so-called mask or tracheal tube to supply gas while sealing the breathing circuit, which consists of the human body's respiratory system and breathing apparatus, from the outside air.It allows for artificial respiration and has high inhalation efficiency. However, it is mainly used for critically ill patients because it involves irritation and discomfort due to covering the patient's mouth and nose or inserting a foreign object directly into the trachea. On the other hand, as for the open type, there is a method and apparatus for controlling the gas supply at breathing synchronization in a breathing system as shown in Japanese Patent Application Laid-Open No. 59-8972. It is inserted into the body and blows gas through it, and it is mainly used for mildly ill patients who rely on spontaneous breathing because they are able to talk, eat and drink while inhaling. In this open breathing system, gas is blown out in synchronization with breathing, so the gas is wasted and dissipated without being used during exhalation.

The present invention relates to an improvement in a breathing sensor attached to the tip of a nasal glasses-shaped cannula, which is a gas supply tube inserted into the nostril in such an open breathing system.

(Problems to be Solved by the Invention) As a prior art related to the present invention, there is Japanese Patent Application Laid-Open No. 59-8972. This involves attaching a thermocouple type sensor to the nozzle at the tip of a conduit that is inserted into the nostril or oral cavity. When a sensor is attached to the nostril branch pipe or the tip of the nozzle of the conduit that supplies gas to the nostrils, the sensor comes into direct contact with the airway wall, which changes the impedance between the sensor and the object to be measured, causing errors in the measured values. can. Furthermore, when the sensor comes into contact with the human body (nostril wall), it induces noise and introduces uncertainties related to the temperature inside the human body, making the measured values unreliable. Another problem is that if the airway is not secured due to nasal congestion or the like, the sensor cannot accurately measure inhalation and exhalation.

(Means for Solving the Problems) The present invention proposes a new method to improve the above-mentioned drawbacks. A spacer is provided between the nostril branch tubes of the nasal glasses-shaped cannula, which has two nostril branch tubes that emit the gas that has been released, and the branch tubes and the nostril wall to form a breathing air passage. The gas inhaler is characterized by a nasal breathing detection gas inhaler in which a sensor for detecting breathing signals is attached to a position behind the tip of the nasal branch tube.

In implementing the breath detection gas inhaler of the present invention, a nasal glasses-shaped cannula is used, which has a conduit for guiding gas and two nostril branch tubes that branch from this conduit and are inserted into the nostrils to release the introduced gas. The configuration is such that a breathing signal detection sensor is attached to each of the two nostril branch pipes.

(Example) An example B of implementing the present invention will be described in detail below with reference to the drawings.

In the conventional system, as shown in Fig. 4, a cannula 1 in the shape of a nosepiece with two branch pipes 2 is attached with a conduit 3, and a gas such as oxygen is supplied from a gas supply connecting pipe 4. .

In the conventional method, as shown in Fig. 5, the branch pipe 2 is inserted into the nostril 5 to blow gas into the nostril, but the thermocouple sensor is inserted into the cannula 1 as shown in Fig. 5A. When the front part of the nostril branch pipe 2 is exposed to the insufflation gas,
Since the supplied gas always hits the sensor regardless of whether the sensor is exhaling or inhaling, it is not possible to detect changes in exhalation or inhalation relative to the gas. Therefore, as shown in position B in Figure 5, the sensor is set a little behind the tip of the nozzle to prevent the supplied gas from directly hitting the sensor. During inspiration, outside air passes through and hits the sensor, and during exhalation, the exhaled air inside the body must be at the position where it passes and hits the sensor. However, when the sensor was installed in such a position and used, it was found that the electrical signal output level obtained from the sensor differed each time it was used. Because there is no means to maintain a constant positional relationship between the part where the sensor is attached and the inner wall of the nostril 5, the positional relationship between the part where the sensor is attached and the inner wall of the nostril changes each time it is used, or during use. This is because the air volume of exhaled air and inhaled air that passes through a part of the sensor differs. Additionally, the sensor itself may be in contact with the body on the inner wall of the nostril, or may be floating, making its condition uneven. This is undesirable because induced noise is superimposed on the respiratory electrical signal obtained from the sensor. Therefore, in order to always obtain stable respiratory signals, it is preferable to keep the sensor isolated from the walls of the nostrils, etc., and to prevent the sensor from directly touching the walls of the nostrils. Humans have two nostrils, and one of them often gets blocked due to colds, etc. In this case, only one of the sensors will work, causing errors in the measured values.

If a sensor is provided in only one of the two nostril branch pipes of the cannula, one of them is blocked and if the patient is breathing only in the other, there is a drawback that a respiratory signal cannot be obtained from the respiratory sensor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a nasal glasses-shaped cannula with a respiratory signal detection sensor that is structured to compensate for these drawbacks and always provide stable respiratory signals.

Figure 1 (A), (B), (C), (D)
, (E), and (P) show embodiments of the present invention, and FIG. 1 (A) is a plan view of the cannula of the present invention.
Figure (B) is a front view of the same, Figure 1 (C) is a side sectional view, Figures 1 (D), (E), and (F) are plan views and front views showing the state in which the attachment is removed from the cannula. FIG. Figure 1 (A), (B)
, (C) shows the state in which the attachments shown in FIGS. 1(D), (E), and (F) are attached to the cannula 1 of FIG. 4.

The attachment 6 of the present invention has two nostril insertion numbers 7 for fitting into the two branch pipes of the cannula 1, a clamp holder 10 that connects the two nostrils and holds the cannula main body between them, and a nostril insertion number 7. It consists of a spacer 8 provided on the back surface of the nostril to separate the nostril insertion number 7 and the branch tube 2 of the cannula, a sensor 9 attached to the spacer 8, and a conducting wire 11 thereof.

The sensor 9 consists of copper-constant thermocouples 9A and 9B, as shown in FIG.

The attachment 6 of the present invention, like the cannula 1, is made of something like soft vinyl.

The nostril insertion number 7 is large enough to fit into the nostril, and has a structure that can fit and hold the nostril branch pipe 2 shown in FIG.
It is composed of a book nostril insertion number 7 and a clamp holder 10 that holds the nasal glasses-shaped cannula main body 1 in a U-shape, and a spacer 8 with a nostril branch pipe 2 and a nostril insertion number 7 inside the nostril insertion number 7. is planted therein, and has a slot 8A so that the thermocouple sensor 11 can be entwined and held as shown in FIG. 1(E). Thermocouple sensor 9 as shown in Figure 1 (E)
After setting the number of insertions in both nostrils to 7, push in the nose glasses-shaped cannula 1 shown in Fig. 4 from below, and as shown in Fig. 1 (8),
The attachment 6 fits into the main body of the cannula 1 with the elasticity of the nostril insertion number 7 in the shape shown in FIGS. 1(B) and 1(C),
Clamp and hold this. The nostril insertion number 7 holds the nostril branch pipe 2 of the nasal glasses-shaped cannula 1 between the spacer 8 and both ends of the nostril insertion number 7 having a cut structure at the bottom. When the nostril insertion number 7 is inserted into the large nostril and used in this state, there is a ventilation passage 13 separated by the nostril insertion branch pipe 2 and the spacer 8 inside the nostril insertion number 7, which is shown in Figure 1 (B ) The structure is connected to the outside air at the part indicated by the arrow, allowing intake and exhalation to take place.

FIG. 2 shows another embodiment of the invention. This has a structure in which a spacer 8 is directly planted in the nostril branch pipe 2. This spacer 8 protrudes in a square shape, and a hole-shaped notch 8A is provided at the bottom of the spacer 8, and a respiration sensor 9A made of a thermocouple is provided in the spacer 8. , 9
Stir in B and hold for use. In this way, a space is maintained between the wall surface of the nostril 5 and the nostril branch pipe 2, resulting in good ventilation, and since the breathing sensor 9 is provided in the passageway, the temperature of exhaled and inhaled air can be detected satisfactorily. Further, since the sensor 9 is separated by the spacer 8 and the nostril insertion number 7 in the case of FIG. 1(A), the sensor does not directly touch the nostril wall.

FIG. 5 shows the configuration of the wires of the thermocouple of the sensor of the present invention and the relationship with the measurement circuit. Humans have two nostrils, but even if the person is not aware of it, one of them may become blocked due to a cold or other conditions, allowing the person to breathe freely through the other open nostril. For this reason, the respiratory signal is detected by sensors 98 on the spacers of both branch pipes.

It is necessary to connect each 9B. In that case, the number of signal lines should be as small as possible in terms of handling, and the value obtained as a signal voltage should be large. Therefore, by applying the law of accumulation of a measurement circuit using a thermocouple sensor, the configuration shown in Figure 5 is constructed. do. In FIG. 5, the joint points of sensors 9A and 9B are attached to the sveza part 8 of each nostril insertion number of 7 of the attachment 6, and the sensor 9A and 9B are attached in FIG.
, set in the position shown as 9B. Also, 90 points are exposed to room temperature.

This corresponds to the position indicated by 90 in FIG. 1(E).

In this way, install sensors 9A and 9B in both nostrils.
/ ), even if one is blocked, it is possible to detect a breathing signal from the other, and if both are working, a large signal level can be obtained.

(Effects of the Invention) In the present invention, the spacer 8 planted in the nostril insertion shell 7 of the attachment 6 secures an inhalation and exhalation passage 13 between the nostril branch pipe 2 and a respiratory signal detection sensor 9 at that position. By setting , stable signal detection can be achieved even if there are variations due to the way the nose-glass-shaped cannula l is attached. Furthermore, in the present invention, the problem of the nostril wall coming into contact with the skin is isolated by the spacer 8, so induced noise is also reduced. In addition, sensors 94 and 9B are set in the nostril insertion shell 7 inserted into both nostrils, so even if one of the nostrils becomes clogged, a respiratory signal can be obtained, which has the effect of significantly increasing the reliability of the measured values. , useful.

[Brief explanation of the drawing]

Figures 1 (A), (B), and (C) are a plan view, a front view, and a side sectional view of the gas inhaler of the present invention with an attachment attached to the cannula, respectively; E) and (F) are a plan view, a front view, and a side sectional view showing the state in which the attachment is removed from the cannula, and FIGS. 2A and 2B are plan views showing another embodiment of the present invention. , a front view, Fig. 3 is a side sectional view of Fig. 2, Fig. 4 is an explanatory diagram of a conventional cannula, Fig. 5 is a diagram for explaining its operation, and Fig. 6 is a measurement circuit using the sensor of the present invention. It is a diagram. 1... Cannula 2... Nostril branch tube 3...
・Conduit 4...Gas supply connection pipe 5...
Nostril 6... Cannula attachment 7... Nostril insertion shell 8... Spacer 9...
Breathing sensor 10...Pinch holding body 11...Conducting wire 12...Measuring circuit 13...Air passage Fig. 1B Fig. 1D Fig. 1F Fig. 5 Fig. 6

Claims (1)

[Scope of Claims] 1. A nostril branch tube of a nasal glasses-shaped cannula having a conduit for guiding gas, and two nostril branch tubes branching from the conduit and inserting into the nostrils to release the introduced gas, and the nostrils. Intranasal breath detection gas inhalation characterized by providing a spacer between walls to form a breathing air passage, and installing a sensor for detecting a breathing signal in the air passage so as to be located behind the tip of the nostril branch pipe. vessel. 2. Breathing signal detection in each of the two nostril branch tubes of the nose glasses-shaped cannula, which has a conduit that guides gas and two nostril branch tubes that branch from this conduit and are inserted into the nostrils and release the introduced gas. The intranasal breath detection gas inhaler according to claim 1, characterized in that a sensor is attached thereto.