JP2003315264A - Sensor for measuring carbon dioxide in breath - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the size and cost of a sensor for measuring carbon dioxide in breathing air, and at the same time, to improve measurement accuracy and responsiveness. SOLUTION: A tubular sensor main body 1 is divided into three parts in the axial direction, a light emitting element 2 and a light receiving element 3 are provided at both ends, respectively, and a breathing passage 4 is provided at a center part. The sensor body 1 is attached to the face under the nostril, and exhaled air discharged from the nostril is introduced into the respiratory air passage 4 and passed through an optical axis connecting the light emitting element 2 and the light receiving element 3 to measure carbon dioxide in the respiratory air. I do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor for measuring carbon dioxide gas in respiratory air for measuring the concentration or the presence or absence of carbon dioxide gas in respiratory air discharged from the nostrils or mouth of a living body, and particularly to a simple and compact sensor. The present invention relates to a sensor for measuring carbon dioxide gas in respiratory air whose structure can improve measurement accuracy and responsiveness.

[0002]

2. Description of the Related Art Generally, in the case of optically measuring the carbon dioxide concentration in respiratory gas of a living body, the respiratory gas is passed through an airway adapter formed in a cylindrical shape, and infrared rays are emitted from the light emitting element to the respiratory gas. Then, the voltage corresponding to the absorption of light by carbon dioxide in the respiratory air is detected by the light receiving element to measure the carbon dioxide concentration.

FIG. 16 shows a schematic configuration of an example of such a conventional carbon dioxide concentration measuring device. In FIG. 16, one end 101a of an airway adapter 101, which is formed in a substantially cylindrical shape and through which breathing gas passes, is adapted to be connected to a tube inserted into the trachea of a patient, and the other end 101b.
Is connected to the Y-piece of a breathing circuit such as an artificial respirator. The middle portion of the airway adapter 101 has a rectangular cross section, and circular windows 101c and 101d are concentrically formed on two opposing surfaces of the middle portion. The sensor body 102 is detachably attached to the middle portion of the airway adapter 101.

The sensor body 102 is formed in a substantially rectangular tube shape, and a U-shaped cutout portion into which the middle portion of the airway adapter 101 is fitted and mounted is formed in the middle portion. The two opposite surfaces of the cutout portion are in contact with the window portions 101c and 101d of the airway adapter 101, respectively. A light emitting element 103 that emits infrared light is arranged on one side of the cutout portion in the sensor body 102.

On the side opposite to the light emitting element 103 with respect to the cutout portion in the sensor body 102, a filter 104 and a light receiving element 10 which absorb only light having a wavelength absorbed by carbon dioxide gas.
5 are arranged. The light emitting element 103 and the light receiving element 105 are connected to the monitor body 107 via lead wires 106. The middle part of the airway adapter 101 is attachable to and detachable from the sensor body 102.

In the conventional carbon dioxide concentration measuring apparatus having the above-mentioned structure, the light emitted from the light emitting element 103 passes through the window portion 101c, the breathing gas in the airway adapter 101, the window portion 101d and the filter 104. And enters the light receiving element 105. Then, the light amount corresponding to the carbon dioxide concentration is detected by the light receiving element 105, and the output signal of the light receiving element 105 is input to the monitor body 107 and displayed as the carbon dioxide concentration.

In the above conventional example, the airway adapter 101 through which the breathing gas passes is attached to the sensor main body 102, but as another conventional example, the sampling tube is connected to the sensor main body installed in the monitor main body 107. It is also known to have a structure. In this case, one end of the sampling tube for sucking a part of the breathing gas is connected to the airway adapter 101 through which the breathing gas passes, and the other end is connected to the monitor body 107. A pump is provided in the monitor body 107 and guides the sucked respiratory gas to the sensor body in the monitor body 107.

Still another breath detection device is USP
No. 5,099,836 and USP No. 5,3
The proposal disclosed by No. 35,656 is known. U
SP No. The proposal disclosed by US Pat. No. 5,099,836 is configured as a partially cutaway top view shown in FIG. In FIG. 17, the inside of a tubular nasal tube 201 is partitioned into a first separation chamber 203 and a second separation chamber 204 by a partition wall 202 formed in the axial direction. One end of the partition wall 202 is connected to one side of the inner surface of the nasal tube 201, and the other end is connected to the other side thereof. The two first separation chambers 203 and the second separation chambers 2
04 is airtightly partitioned. Nasal tube 205, which is inserted into the nostrils, is provided on the outer circumference of the nasal tube 201.
Nose tube 2 is provided with 206 protruding in parallel.
The insides of 05 and 206 are separated by the extended partition wall 202, and the separation passages 205a, 205b, 206a,
206b is formed. And the separation passage 205a,
206a communicates with the first separation chamber 203, and each of the separation passages 205b and 206b communicates with the second separation chamber 204.

First separation chamber 2 of nasal tube 201
An oxygen gas supply tube 207 is connected to one end on the 03 side, and a detection tube 208 for detecting the pressure of the breathing gas is connected to one end on the second separation chamber 204 side.
The oxygen gas supply tube 207 is connected to an oxygen cylinder via a pressure adjusting valve (not shown), and the detection tube 208 is connected to a pressure transducer (not shown). The detection tube 208 may be used as a sampling tube and connected to a carbon dioxide detection monitor (not shown) to measure the concentration of carbon dioxide in the breath.

In the respiratory gas detecting apparatus constructed as described above, the oxygen gas supply tube 2 is connected to the oxygen cylinder.
Oxygen supplied through 07, the first separation chamber 203,
Separation passages 205a, 206 of nasal tubes 205, 206
It is supplied into the nostril through a. Further, part of the exhaled air exhausted from the nostril passes through the separation passages 205b and 206b and the second separation chamber 204 and is discharged to the detection tube 208, and the pressure of the breathing gas, the carbon dioxide concentration, etc. are detected.

USP No. As shown in FIG. 18, the proposal disclosed in US Pat. No. 5,335,656 is applied to the skin surface close to the nose to deliver therapeutic gas to the nostrils and to measure carbon dioxide concentration in respiratory air. An elongated hollow body 301 having a tubular portion is provided with a partition wall 302 to form an inspiratory chamber 303 and an expiratory chamber 304. A tube 305 for supplying a therapeutic gas to the inspiratory chamber 303 is connected to one end of the hollow body 301, and a tube 30 for sucking exhaled air from the expiratory chamber 304 is connected to the other end of the hollow body 301.
6 is connected.

A first nose tube 307 for feeding the gas to the first nostril is connected to the inhalation chamber 303 so as to communicate therewith, and an exhalation chamber 304 is attached to the second nostril for exhalation. A second nasal tube 308 for suction is connected in communication. The tube 306 is connected to a carbon dioxide gas measuring sensor (not shown), and measures the amount of carbon dioxide gas in the exhaled gas sucked by this sensor.

[0013]

According to the conventional carbon dioxide concentration measuring device shown in FIG. 16, the airway adapter 10 is used.
1 is required, and the airway adapter 101 is connected to the endotracheal tube and the Y-piece, so it is difficult to connect to a patient whose endotracheal tube is not intubated, and the device becomes large in size Was complicated and expensive. Further, the airway adapter 101 needs to be replaced, which increases the running cost. Further, the light emitting element 103
In the past, the sensor body 102
There is a risk of burns because the temperature rises and the design is such that the skin touches the skin directly because it will be touched for a long time for measurement.

When the detection tube shown in FIG. 17 is used for a long time, there is a problem that the detection tube is clogged with water in the respiratory air. Further, since the detection tube is a consumable item, the running cost becomes high. Further, when the detection tube is used as a sampling tube, the tube usually has a length of 2 m or more, so that there is a time delay until the carbon dioxide gas is detected, and the detection response becomes slower, resulting in poor accuracy.

Further, according to the conventional example shown in FIG. 17, when one of the nostrils into which a pair of nose tubes 205 and 206 is inserted is clogged, the clogged side results in sampling air. The concentration of carbon dioxide in the exhaled gas may be reduced to about half and a measurement error may occur. Further, according to the conventional example shown in FIG. 18, when the nostril on the side where the first nose tube 307 on the side of the intake chamber 303 is inserted is clogged, the therapeutic gas cannot be supplied into the living body. Conversely, the second on the side of the exhalation chamber 304
When the nostril on the side where the nose tube 308 is inserted is clogged, carbon dioxide gas cannot be detected.

The present invention has been made in view of such a situation, and it is possible to accurately detect the carbon dioxide concentration even when one nostril is clogged, and improve the measurement accuracy and responsiveness. An object of the present invention is to provide a sensor for measuring carbon dioxide gas in respiratory air, which can be reduced in size and can be reduced in running cost.

[0017]

In order to achieve the above object, the present invention according to claim 1 is for measuring carbon dioxide gas in respiratory air for measuring the concentration or presence of carbon dioxide gas in the respiratory air of a living body. In the sensor, a supporting member that supports a light emitting element and a light receiving element that are arranged to face each other on the same optical axis, and when the supporting member is attached to the lower part of the nostril of the living body, the respiratory air crosses the optical axis. It is characterized in that a breathing air passage that can pass therethrough is provided.

The present invention according to claim 2 is characterized in that holding means for mounting and holding the support member at the lower part of the nostril is provided.

The present invention as set forth in claim 3 is characterized in that the holding means is an ear hook string for locking the ear means of the living body.

According to a fourth aspect of the present invention, the ear hook strap is internally provided with a lead wire for supplying electric power to the light emitting element or a lead wire for leading out a signal detected by the light receiving element to the outside. It is characterized by

According to a fifth aspect of the present invention, the holding means is a locking member which is provided on the supporting member and which is inserted into the nostril and locked by a tube for supplying oxygen. And

The present invention according to claim 6 is characterized in that the holding means is an oxygen mask for covering the face of the living body and supplying oxygen.

The present invention according to claim 7 is characterized in that the support member is provided with a respiratory air guide portion for introducing respiratory air from the nostril into the respiratory air passage.

The present invention according to claim 8 is characterized in that the support member is provided with an adapter having a nasal tube which is inserted into the nostril and introduces respiratory air from the nostril into the respiratory air passage. .

According to a ninth aspect of the present invention, the support member is provided with a breath air guide portion for introducing breath air from the mouth into the breath air passage.

According to a tenth aspect of the present invention, in a sensor for measuring carbon dioxide gas in respiratory air for measuring the concentration or the presence or absence of carbon dioxide gas in the respiratory air of a living body, light emitting elements arranged opposite to each other on the same optical axis. An outer surface of an oxygen mask for supplying oxygen by providing a breathing air passage through which the breathing air can pass across the optical axis in a supporting member supporting the light receiving element and covering the face of the living body with the supporting member. The oxygen mask and the respiratory air passage are electrically connected to each other.

The present invention according to claim 11 is characterized in that the light emitting element is a small infrared radiant lamp having a power consumption of 0.3 W or less.

According to the twelfth aspect of the present invention, in a sensor for measuring carbon dioxide gas in respiratory air for measuring the concentration or the presence or absence of carbon dioxide gas in the respiratory air of a living body, both ends are opened and the respiratory air is provided on the peripheral wall. An airway case having a through hole formed therein, and a pair of ridge-holding members for air-tightly holding a translucent thin film between both end surfaces of the airway case, and an outer side of the pair of ridge-holding members. Supports a light emitting element and a light receiving element, which are respectively fitted to the ends and are arranged to face each other on the same optical axis.
It is composed of a pair of supporting members, and when the airway case is attached to the lower part of the nostril of the living body, the breathing air can pass across the optical axis.

According to a thirteenth aspect of the present invention, the thin film is an antifogging film which prevents water in the breathing air from condensing on its surface.

According to a fourteenth aspect of the present invention, a pair of the support members is detachably locked to the pair of ridge holding members via a locking member.

According to a fifteenth aspect of the present invention, the airway case is provided with an adapter having a nose tube which is inserted into the nostril and introduces respiratory air from the nostril into the airway case. .

According to a sixteenth aspect of the present invention, the airway case is provided with a breathing air guide portion for introducing breathing air from the mouth into the airway case.

According to the present invention described in any one of claims 1 to 11, the respiratory air of the living body can be guided directly to the optical axis of the sensor through the respiratory air passage provided in the sensor.
The airway adapter and sampling tube used in the past are not required, and the sensor can be downsized and the cost can be reduced, and the carbon dioxide concentration can be accurately detected even when one nostril is blocked. The responsiveness can be improved.

According to the twelfth to sixteenth aspects of the present invention, the airway case through which breathing air passes and the support member for supporting the light emitting element and the light receiving element are detachably attached to each other. The airway case will be easier to produce and easier to clean. Moreover, since the thin film is airtightly held between the airway case and the support member via the squeezing member, by forming the thin film with the anti-fog film, it is possible to prevent the occurrence of fogging due to the moisture in the respiratory air. Therefore, carbon dioxide in respiratory air can be accurately measured.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a sensor for measuring carbon dioxide gas in respiratory air according to the present invention will be described below with reference to the drawings.

FIG. 1 is a cross sectional view showing an example of the configuration of an embodiment of a sensor of the first invention of the present invention. In FIG.
The sensor body 1 as a support member formed of resin or metal in a substantially cylindrical shape is axially divided into three chambers. Three
A light emitting element 2 is arranged on one end side of the chamber, and a light receiving element 3 is arranged on the opposite one end side thereof, and a central portion serves as a respiratory air passage 4 which penetrates in the vertical direction in the figure. The two chambers on both sides and the respiratory air passage 4 are airtightly partitioned by partition walls, and an opening is formed at the center of each partition wall. Transmission windows 5 for transmitting light are hermetically provided in the openings on the side of the light emitting element 2 and the side of the light receiving element 3, respectively, and only light having a wavelength of light absorbed by carbon dioxide gas is transmitted to the side of the light receiving element 3. A filter 6 is provided.

A lead wire 7 for supplying a voltage is connected to the light emitting element 2, and a lead wire 8 for leading the detected signal to the outside is connected to the light receiving element 3. The lead wires 7 and 8 are held by the sensor body 1 via sockets 9 and 10, respectively. Further, on the back surface of the light emitting element 2, there is provided a reflecting mirror 11 for converging light on the light receiving surface. The light emitting element 2 radiates infrared rays and consumes less power.
It is composed of a small lamp of 3w or less.

FIG. 2 shows another example of the structure of the sensor body 1 shown in FIG. FIG. 2A shows an example in which both ends of the sensor body 1 are curved according to the shape of the face under the nostrils of the living body. Even in this case, the light emitting element 2 and the light receiving element 3 are fixedly held on the sensor main body 1 with a predetermined distance on the same optical axis. According to this configuration example, the sensor body 1 can be stably held on the face of the living body.

FIG. 2B shows an example in which the sensor main body 1 is formed of a rectangular parallelepiped, and the respiratory air passage 4 is formed by cutting out at the center in the axial direction. The sensor body 1 may have a cylindrical shape.

FIG. 2 (c) shows an example in which both ends of the sensor body 1 for holding the light emitting element 2 and the light receiving element 3 are connected by a plurality of, for example, four connecting rods 1a. According to this configuration example, since it is possible to measure the respiratory air passing from almost any angle, the degree of freedom of arrangement when the sensor body 1 is mounted under the nostril if the optical path is orthogonal to the flow of the respiratory air. Will increase.

Next, the sensor body 1 constructed as described above
The holding means for mounting and holding the above under the nostril on the surface of the subject will be described. FIG. 3 is a perspective view showing a first configuration example of the holding means. Ear straps 12 and 13 are connected to both ends of the sensor body 1, respectively.
Lead wires 7 and 8 are provided inside 2 and 13, respectively. The sensor body 1 is held under the nostril 15 by hooking the ear hooks 12 and 13 on the ears 14.

FIG. 4 is a perspective view showing a second structural example of the holding means. In FIG. 4, a nasal tube 16 which is a tubular body for supplying oxygen into the living body is attached to the nostril 15 of the subject. Tubes 17 and 18 for supplying oxygen are connected to both ends of the nasal tube 16. A grip 19 as a U-shaped locking member that projects outward is integrally formed on the outer periphery of the central portion of the sensor body 1.

With the above structure, by fitting the grip 19 of the sensor body 1 to the outer circumference of the nasal tube 16, the sensor body 1 can be attached and held under the nostril 15 on the face of the subject. At this time, the tubes 17 and 18 of the nasal tube 16 are hung on the ear 14 of the subject. If the ear straps 12 and 13 of the sensor body 1 are also hooked on the ears 14 as shown in FIG. 4, the sensor body 1 can be held more reliably. In this state, the exhaled air discharged from the nostril 15 is introduced into the respiratory air passage 4 of the sensor body 1, and the sensor body 1 can detect the concentration or presence / absence of carbon dioxide gas.

In the configuration example shown in FIG. 4, the ear hooks 12 having the lead wires 7 and 8 internally provided at both ends of the sensor body 1, respectively.
Although the case where 13 is connected has been described, as shown in FIG. 5, the lead wires 7 and 8 may be integrated into one wire and not attached to the ear 14. In this case, the sensor body 1 is held by the nasal tube 16 via the grip 19.

Instead of using the ear hooks 12 and 13 shown in FIG. 3, a tape may be used as a holding means to hold the sensor body 1 on the face.

Further, as shown in the perspective view of FIG. 6, the outer periphery of the respiratory air passage 4 formed in the sensor body 1 is covered with a semi-cylindrical adapter 32 having a pair of nose tubes 31.
The nose tube 31 may be inserted into the nostril 15. In this case, as shown in the exploded perspective view of FIG.
The nose tube 31 is electrically connected to the inside of the adapter 32,
Respiratory air from the nose is guided to the respiratory air passage 4 of the sensor body 1. The shape of the pair of nose tubes 31 is shown in FIG.
It may be independent as shown in FIG. 7, may be V-shaped as shown in FIG. 7B, or may be U-shaped as shown in FIG. 7C. Further, as shown in the perspective view of FIG. 7D, the adapter 32 may be formed into a substantially cylindrical shape, and may be inserted into the respiratory air passage 4 of the sensor body 1 as shown in the perspective view of FIG. 7E. . In this case, an opening 32a through which respiratory air flows is formed at the bottom of the adapter 32.

FIG. 8 is a perspective view showing a structural example of the second embodiment of the present invention. This configuration example is an example in which the sensor body 1 is attached and held on the inner surface of the oxygen mask 20 attached to the face. In FIG. 8, the oxygen mask 20 is a band 21.
It is hung on the ear 14 via. In the oxygen mask 20, a pair of left and right annular adapters 22 are fixed at positions facing both lower sides of the nostril 15, and the adapters 22 are connected by a connecting rod 23. When the grip 19 provided on the sensor body 1 is fitted to the connecting rod 23, the sensor body 1 is mounted and held in the oxygen mask 20. At this time, the ear hook string 1 connected to the sensor body 1
Hang 2 and 13 on the ear 14.

Also in this configuration example, it is possible to obtain the same effects as those of the first configuration example shown in FIG.

FIG. 9 is a perspective view showing a fourth structural example of the holding means. This configuration example is an example in which the sensor body 1 is attached and held on the outer surface of the oxygen mask 20 attached to the face. In FIG. 9, the sensor body 1 is fixed to the position of the breathing pores on the outer surface of the oxygen mask 20 via an annular adapter 24. Then, the sensor body 1 measures the carbon dioxide gas in the respiratory air exhaled from the oxygen mask 20.

Also in this configuration example, it is possible to obtain the same effects as those of the first configuration example shown in FIG.

FIG. 10 is a partially sectional front view showing an example in which a breathing air guide portion 25 for introducing exhaled air into the breathing air passage 4 is provided on the inlet side of the breathing air passage 4 of the sensor body 1. The breathing air guide portion 25 has a jogo shape that can be closely attached to the face under the nose.

According to the configuration example of the present embodiment, the exhaled air can be surely introduced into the respiratory air passage 4 of the sensor body 1, and even if one of the pair of nostrils 15 has a nasal clogging or the like, the exhaled air can be reliably discharged. Moreover, carbon dioxide in respiratory air can be detected.

FIG. 11 is a perspective view showing another structural example of the respiratory air guide portion. In this configuration example, it has a nasal respiratory air guide portion 26 and an oral respiratory air guide portion 27, and is fixed to the outer periphery of the respiratory air passage 4 of the sensor body 1. Nasal respiration guide unit 26
Has a funnel shape and has notches 26a formed on both sides of the center so that the nose can be inserted. In addition,
The notch 26a is formed only on the living body side, and the notch may be not provided on the opposite side. In addition, nasal respiratory guide 2
Depending on the height of 6, the notches 26a on both sides may be omitted.

The mouth breath air guide portion 27 is constructed so as to face the mouth when the sensor body 1 is mounted on the face, and has a plate shape which curves toward the mouth. Note that only one of the nose breath air guide portion 26 and the mouth breath air guide portion 27 may be provided.

12 to 15 show an example of the configuration of the third embodiment of the present invention. 12 is a cross sectional view, FIG.
Is a longitudinal sectional view, FIG. 14 is an exploded perspective view, and FIG. 15 is a perspective view of main part assembly. In these figures, both left and right sides of an airway case 41, which is a tubular body formed in a rectangular tubular shape, are opened, and an adapter 4 for a nose tube 42 described later is provided on the upper surface.
Adapter receiving portion 41d to which 3 (annular thin plate shape) is attached
Are provided to form round holes 41a, and short ventilation holes 41b are formed on the lower surface. The adapter 43 of the nose tube 42 is fitted and attached to the adapter receiving portion 41d formed on the upper surface. The nose tube 42 is made of a flexible material such as silicone rubber,
There are two tubes standing upright that are inserted into the nose and guide the exhalation. The lower end of the nose tube 42 communicates with the airway case 41.

On both left and right end surfaces of the airway case 41,
An antifogging film 44, which is a thin film, is arranged in each case. Further, an antifogging film case 45 as a gripping member is arranged outside the antifogging film 44, and the outer circumference on one side of the antifogging film case 45 is fitted to the inner circumference of the end face of the airway case 41. The step portion 45a is formed. Then, the anti-fogging film 44 is pressed against both end surfaces of the airway case 41 by the anti-fogging film case 45, and the step portion 45a is fitted to the inner circumference of the end surface, whereby the anti-fogging film 44 is attached.
Can be fixed airtightly. Further, on one side surface of the airway case 41, a hook 41c for locking an oral breathing guide, which will be described later, is provided.

Steps 45a are provided on both sides of the anti-fog film case 45.
On the other hand, an arm 45b projecting to the opposite side is integrally provided, and a locking hole 45c is formed near the tip of the arm 45b. Further, in the center of the lower surface of the anti-fog film case 45,
V-shaped notch 45d that opens in the same direction as arm 45b
Are formed.

A light emitting portion 46 and a light receiving portion 47 are detachably mounted on the outside of the pair of anti-fogging film cases 45, respectively.
The light emitting section 46 is composed of a light emitting element 48, a reflecting mirror 49, and a rectangular tube-shaped light emitting section case 51 as a support member that coaxially houses a window section 50 made of sapphire. Further, the light receiving unit 47 is
It comprises a light receiving element 52 and a rectangular tubular light receiving case 54 as a support member for coaxially accommodating a window 53 made of sapphire. The lead wires 55 and 56 respectively connected to the light emitting element 48 and the light receiving element 52 are connected to the sockets 57 and 5, respectively.
It is led out to the outside of the cases 51 and 54 via 8.

Hooks 51a are provided on both side surfaces of the light emitting unit case 51, and projections 51b are provided on the upper surface thereof. When the light emitting unit case 51 is inserted between the arms 45b of the antifogging film case 45, The hook 51a is the arm 45
It is fixed by including it in the locking hole 45c formed in b. The protrusion 51b provided on the upper surface is abutted on the upper end surface of the antifogging film case 45 and positioned. Further, a triangular column-shaped projection 51c is provided on the lower surface of the light emitting case 51, and is fitted and positioned in a notch 45d formed in the lower end surface of the antifogging film case 45 during assembly (the circle in the upper right of FIG. 14). (In the figure, the arm 45b on the front side of the anti-fog film case 45 is cut out so that the cutout 45d can be seen). Light receiver case 5
4, a hook 54a, a protrusion 54b,
54c is provided.

An oral breathing air guide 59 is detachably attached to one side surface of the airway case 41. The mouth breath air guide 59 is made of elastic polypropylene or the like and formed in a scoop shape. A hole 59a into which the hook 41c provided in the airway case 41 is fitted is formed in the upper portion of the mouth breathing air guide 59.

According to the present embodiment, the light emitting unit case 51
Since the light receiving case 54 and the airway case 41 are attachable to and detachable from the airway case 41, the window 5 made of sapphire
The adhesion of 0 and 53 to the cases 51 and 54 becomes easy, and the productivity is improved. In addition, the airway case 41 can be easily cleaned.

In the above configuration example, the airway case 4
1, the nose tube 42 and the adapter receiving portion 41d may be omitted, and the respiratory air may be directly introduced into the airway case 41.
The mouth breath air guide 59 may be omitted if it is not necessary.

[0063]

As described above, according to the sensor for measuring carbon dioxide gas in respiratory air of the present invention, the supporting member for supporting the light emitting element and the light receiving element, which are arranged to face each other on the same optical axis,
When the support member is attached to an oxygen mask that covers the lower part of the nostrils of the living body or the face, a breathing air passage through which the exhaled breath can pass across the optical axis is provided. Since the sampling tube is not required, the sensor can be downsized and the cost can be reduced. Moreover, the accuracy and responsiveness of the measurement are improved. Furthermore, since the electric power of the light emitting element is reduced, the temperature rise is small and the risk of burns is eliminated.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration example of an embodiment of a sensor for measuring carbon dioxide gas in respiratory air according to the first invention of the present invention.

2 is a perspective view showing the external appearance of the configuration of the sensor body of FIG. 1, and FIG. 2 (a) is a perspective view showing the external appearance of one configuration example;
(B) is a perspective view showing the appearance of another configuration example, and (c) is a perspective view showing the appearance of yet another configuration example.

FIG. 3 is a perspective view showing a state in which the sensor body of FIG. 1 is attached to an ear via an ear hook strap.

FIG. 4 is a perspective view showing a state where the sensor body of FIG. 1 is attached to a nasal tube.

FIG. 5 is a perspective view showing a state in which the lead wires provided in the ear hanging strap shown in FIG. 4 are gathered on one side of the sensor body.

6 is a perspective view showing a state in which an adapter having a nose tube is attached to the outer periphery of the sensor body shown in FIG.

7A and 7B are diagrams showing a configuration of a main part of the sensor main body of FIG. 6, another configuration example, and an assembled state, FIG. 7A is an exploded perspective view of a main part of the sensor main body, and FIG. Front view showing another shape example, (c) a front view showing another shape example of the nose tube, (d) a perspective view showing another configuration example of the adapter, (e) an adapter shown in (d). FIG. 3 is a perspective view showing a state in which is inserted into the sensor body.

FIG. 8 is a perspective view showing a configuration example of an embodiment of a sensor for measuring carbon gas in respiratory air according to the second invention of the present invention.

9 is a perspective view showing a state where the sensor body of FIG. 1 is attached to the outer surface of an oxygen mask.

10 is a partial cross-sectional front view showing a state in which a respiratory air introduction guide is provided at the respiratory air passage inlet of the sensor body of FIG.

11 is a perspective view showing a state in which a nasal respiratory air guide portion and an oral respiratory air guide portion are provided in the respiratory air introduction guide of FIG.

FIG. 12 is a cross-sectional view showing a configuration example of an embodiment of the third invention of the present invention.

13 is a vertical cross-sectional view of FIG.

FIG. 14 is an exploded perspective view of FIG.

FIG. 15 is a perspective view showing an assembly of main parts of FIG.

FIG. 16 is an explanatory diagram showing a schematic configuration of an example of a conventional carbon dioxide concentration measuring device.

FIG. 17 is a vertical cross-sectional view showing the configuration of an example of a conventional Nezar tube.

FIG. 18 is a perspective view showing the configuration of another example of a conventional Nezar tube.

[Explanation of symbols]

1 Sensor body (supporting member) 2 Light emitting element 3 Light receiving element 4 Breathing air passage 7, 8 Lead wire 12, 13 Ear strap 14 Ear 15 Nostril 16 Nasal tube (tubular body) 19 Grip (locking member) 20 Oxygen mask 25 Breathing air guide portion 26 Nasal breathing air guide portion 27 Mouth breathing air guide portion 31 Nose tube 32 Adapter 41 Airway case (cylindrical body) 41a, 41b
Hole 42 Nose tube 43 Adapter 44 Anti-fog film (thin film) 45 Anti-fog film case (holding member) 51 Light emitting part case (supporting member) 54 Light receiving part case (supporting member) 59 Oral breath guide

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Kojima             1-34-1 Nishiochiai, Shinjuku-ku, Tokyo Japan             Within Koden Kogyo Co., Ltd. (72) Inventor Tokuaki             1-34-1 Nishiochiai, Shinjuku-ku, Tokyo Japan             Within Koden Kogyo Co., Ltd. F-term (reference) 2G057 AA01 AB02 BA05 BD01 DA20                       DC07 GA06                 2G059 AA01 BB01 BB12 CC04 EE01                       HH01 JJ03 KK01 NN01                 4C038 SU19

Claims (16)

[Claims] 1. A sensor for measuring carbon dioxide concentration in the respiratory air of a living body for measuring the concentration or presence of carbon dioxide in the respiratory air, the support for supporting a light emitting element and a light receiving element, which are arranged to face each other on the same optical axis. A carbon dioxide gas in respiratory air, characterized in that a respiratory air passage through which the respiratory air passes through the optical axis when the supporting member is attached to the lower part of the nostril of the living body is provided in the member. Sensor. 2. The sensor for measuring carbon dioxide gas in respiratory air according to claim 1, further comprising holding means for mounting and holding the support member at a lower portion of the nostril. 3. The sensor for measuring carbon dioxide gas in the respiratory air according to claim 2, wherein the holding means is an ear hook string for locking the ear hook of the living body. 4. The ear hook string is internally provided with a lead wire for supplying electric power to the light emitting element or a lead wire for leading out a signal detected by the light receiving element to the outside. The sensor for measuring carbon dioxide in respiratory air according to the above. 5. The breathing apparatus according to claim 2, wherein the holding means is a locking member that is provided on the support member and that is locked by a tube body that is inserted into the nostril and supplies oxygen. Sensor for measuring carbon dioxide in the air. 6. The sensor for measuring carbon dioxide gas in respiratory air according to claim 2, wherein the holding means is an oxygen mask that covers the face of the living body and supplies oxygen. 7. The breathing air guide portion for introducing breathing air from the nostril into the breathing air passage is provided on the support member, according to any one of claims 1 to 6. Sensor for measuring carbon dioxide in respiratory air. 8. The support member is provided with an adapter having a nasal tube which is inserted into the nostril and introduces respiratory air from the nostril into the respiratory air passage.
A sensor for measuring carbon dioxide gas in respiratory air according to claim 4. 9. The breathing air guide portion for introducing the breathing air from the mouth into the breathing air passage is provided on the supporting member, according to any one of claims 1 to 7. Sensor for measuring carbon dioxide in respiratory air. 10. A sensor for measuring the concentration or presence of carbon dioxide gas in the respiratory air of a living body, comprising a support for supporting a light emitting element and a light receiving element that are arranged opposite to each other on the same optical axis. The member is provided with a respiratory air passage through which the respiratory air can pass across the optical axis, and the support member is attached to the outer surface of an oxygen mask that supplies oxygen by covering the face of the living body. A sensor for measuring carbon dioxide in respiratory air, characterized in that the respiratory air passage and the respiratory air passage are electrically connected. 11. The light emitting device has a power consumption of 0.3 W.
The sensor for measuring carbon dioxide gas in respiratory air according to any one of claims 1 to 10, wherein the sensor is a small-sized infrared radiation lamp below. 12. A sensor for measuring carbon dioxide gas in respiratory air for measuring the concentration or the presence or absence of carbon dioxide gas in the respiratory air of a living body, wherein both ends are opened, and holes are formed in a peripheral wall through which the respiratory air passes. An airway case, a pair of ridge-holding members for hermetically sandwiching a light-transmissive thin film between the airway case and both end faces of the airway case, and a pair of outer-side ends of the ridge-holding members, respectively. A pair of support members respectively supporting a light emitting element and a light receiving element arranged opposite to each other on the same optical axis, and when the airway case is attached to a lower part of the nostril of the living body, the breathing air emits the optical axis. A sensor for measuring carbon dioxide gas in respiratory air, which is characterized in that it can pass across a space. 13. The sensor for measuring carbon dioxide gas in respiratory air according to claim 12, wherein the thin film is an antifogging film for preventing water in the respiratory air from condensing on the surface thereof. 14. The breathable air according to claim 12, wherein the pair of support members are detachably locked to the pair of ridge holding members via a locking member. Sensor for measuring carbon dioxide. 15. The airway case is provided with an adapter having a nose tube which is inserted into the nostril and introduces respiratory air from the nostril into the airway case. One of them
The sensor for measuring carbon dioxide gas in respiratory air according to item 6. 16. The airway case is provided with a breathing air guide portion for introducing breathing air from a mouth into the airway case, according to any one of claims 12 to 15. Sensor for measuring carbon dioxide in respiratory air.