JP3421795B2 - Airway adapter attachment / detachment mechanism for breathing air - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breathing airway in which a detecting portion is equipped with an airway adapter provided in a carbon dioxide concentration measuring device for measuring the concentration of carbon dioxide contained in exhaled gas. The present invention relates to an adapter attaching / detaching mechanism.

[0002]

2. Description of the Related Art Generally, when optically measuring the concentration of carbon dioxide in exhaled gas, respiratory gas is passed through an airway adapter formed of a transparent resin in a cylindrical shape, and infrared light is emitted from the light source to the respiratory gas. The carbon dioxide concentration is measured by irradiating and detecting a voltage corresponding to the absorption of light by carbon dioxide during exhalation with a detector.

A schematic configuration of an example of such a conventional carbon dioxide concentration measuring device is shown in FIGS. 5 and 6. 5 and 6
In the above, one end 1a of the airway adapter 1 which is formed in a substantially cylindrical shape and through which breathing gas passes is a connecting end that the subject holds in his mouth, and the other end 1b is an open end communicating with the atmosphere. The middle portion of the airway adapter 1 has a rectangular cross section, and concentric circular windows 1c and 1d are formed on two opposing surfaces of the middle portion. The intermediate portion of the airway adapter 1 is detachably attached to the detection portion 2.

The detector 2 is formed in a substantially rectangular tube shape.
A U-shaped notch 2a is formed in the middle part so that the middle part of the airway adapter 1 is fitted and mounted. The two facing surfaces of the cutout portion 2a are respectively attached to the airway adapter 1
Are in contact with the windows 1c and 1d. Notch 2 in the detector 2
A light source 3 that emits infrared light is arranged on one side of a, and an optical interrupter 5 that is rotationally driven by a motor 4 is arranged on the other side. The light interrupter 5 is concentrically formed with a plurality of light transmission holes for continuously interrupting the light emitted from the light source 3.

On the opposite side of the light source 3 with respect to the optical interrupter 5,
A filter 6 that absorbs only light of a wavelength that is absorbed by carbon dioxide and a photodetector 7 that is a light receiving unit are arranged.
The photodetector 7 is connected to the monitor body 9 via a lead wire 8. The intermediate portion of the airway adapter 1 is attachable to and detachable from the detection unit 2 via a pair of ball plungers 10 provided in the detection unit 2.

In the conventional carbon dioxide concentration measuring device having the above structure, the light emitted from the light source 3 is emitted from the window 1
Light emitted from the window 1d through the breathing gas in the c and the airway adapter 1 is incident on the photodetector 7 through the filter 6 as light interrupted by the photointerrupter 5. Then, the light amount corresponding to the carbon dioxide concentration is detected by the photodetector 7, and the output signal of the photodetector 7 is input to the monitor main body 9 and displayed as the carbon dioxide concentration.

[0007]

By making the airway adapter 1 attachable to and detachable from the detecting portion 2 as described above, it can be made disposable when the airway adapter 1 is contaminated. However, conventionally, the airway adapter 1 is fixed to the detection unit 2 by using the ball plunger 10 or the like. Therefore, the airway adapter 1 may not be attached at a predetermined position within the cutout portion 2a of the detection unit 2 and may be attached at a halfway position,
In this case, the amount of light decreases and S / N and accuracy deteriorate,
As a result, a misdiagnosis may occur. Further, since the ball plunger 10 mounted on the detection unit 2 presses the intermediate portion of the airway adapter 1, the reaction force acts in the same direction as the optical axis, and the distance between the light source 3 and the photodetector 7 increases. ,
There was also a possibility that the accuracy would deteriorate. In order to solve this point, it was necessary to increase the rigidity of the detection unit 2.

The present invention has been made in view of the above circumstances, and the airway adapter can be reliably mounted at a predetermined position of the detecting portion, and the distance between the light source and the light receiving portion is not changed. An object is to provide a breathing airway adapter attaching / detaching mechanism having a simple structure.

[0009]

In order to achieve the above object, the invention of claim 1 is an airway through which a breathing gas passes to a detection section having a light source and a light receiving section which are arranged to face each other on the same optical axis. In a breathing airway adapter attaching / detaching mechanism for mounting an adapter across the optical axis, an elastic member having a pair of claws integrally formed on the outer periphery of the airway adapter, and the airway adapter formed in the detection unit. It pairs but disposed in the detecting portion so as to lock the and the elastic member provided in the vicinity of the notch to be fitted
A locking member, and the airway adapter is provided in the cutout portion.
When the pusher is pushed in, the claws are
It will be elastically deformed inward by being pushed by and will get over the mountain part.
Elastically deforms outward and contacts the inner slope of the locking member
It is characterized by Respiratory airway with the above configuration
Detects an airway adapter in the adapter attachment / detachment mechanism
When fitted in the notch formed in the
The outer circumference of the elastic member claw that is integrally formed on the outer circumference of the
Abut the locking members provided on both sides of the cutout of the projecting part,
The elastic member is compressed and gets over the ridge of the locking member. It
If you insert the airway adapter into the notch,
When the member exceeds the peak of the locking member, its elastic force
It is restored to its original position and locked and held in place.

Further , the invention of claim 2 is a pair on the same optical axis.
The breathing gas is attached to the detector that has a light source and a light receiver that are arranged in
Cross the optical axis through the airway adapter
The breathable airway adapter attachment / detachment mechanism
Is integrally formed on the outer periphery of the airway adapter.
An elastic member having a pair of claws is formed on the detection unit.
Installed near the notch where the airway adapter fits.
And the detection part so as to lock the elastic member.
And a pair of locking members arranged, the front of the notch
Note When the airway adapter is pushed in, the
It is elastically deformed so that it is pushed by the locking member and pushed outward.
It is characterized by being shaped and further elastically deformed inward. Up
In the airway adapter attachment / detachment mechanism of the respiratory air with the above configuration
Attach the airway adapter to the notch formed on the detector.
When mated, it is integrally formed on the outer circumference of the airway adapter.
The inner circumference of the claw of the elastic member is set on both sides of the notch of the detection unit.
Abutting against the worn locking member and being pushed by the locking member
Elastically deformed to push outwards,
After being deformed, it is locked and held.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a breathing airway adapter attaching / detaching mechanism of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, portions corresponding to those of the conventional example shown in FIGS. 5 and 6 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In FIG. 1, an elastic member 11 having a claw integrally resin-molded with the airway adapter 1 is provided at a connecting portion between the cylindrical ends 1a and 1b of the airway adapter 1 and an intermediate portion 1e having a rectangular cross section. Has been. Elastic member 11
Is arranged in a direction perpendicular to the axial direction of the airway adapter, and is partially cut away to form a claw. The pair of left and right claws 11a projects from the outer circumferences of both ends 1a and 1b, respectively. The distance between the pair of upper and lower elastic members 11 is equal to the thickness of the detection unit 2.

On the other hand, on both sides of the end of the notch 2a into which the airway adapter 1 formed in the detecting section 2 is fitted, locking members 12 are integrally formed on both surfaces of the detecting section 2 at predetermined intervals. ing. The facing surface of the locking member 12 is
It has a mountain shape with the center protruding inward.

Next, the operation of this embodiment will be described with reference to FIG. Hold the airway adapter 1 by hand and fit the intermediate portion 1e into the cutout portion 2a of the detection portion 2. Initially, as shown by the solid line, the tip of the claw 11a of the elastic member 11 abuts on the mountain portion of the locking member 12. When the airway adapter 1 is pushed into the cutout portion 2a, the claw 11a is pushed by the mountain portion of the locking member 12 and elastically deformed inward as shown by the chain line. When the airway adapter 1 is further pushed into the cutout portion 2a, the claw 11a rides over the ridge portion of the locking member 12 as shown by the chain double-dashed line, and is deformed outward by the elastic force so that the slant surface inside the locking member 12 is formed. It abuts and is positioned and mounted at a predetermined position.

As shown in FIG. 3, as described above, the airway adapter 1
1 shows a state in which the detection unit 2 with the attached is detachably attached to the monitor body 9. In this case, the adjoining two sides of the detection unit 2 are formed in an arc shape, and the monitor main body 9 is formed with an arc-shaped notch 9a into which the detection unit 2 is fitted.

According to this embodiment, the airway adapter 1
The elastic member 11 having the claws at a predetermined interval is provided on the outer periphery of the
Since the locking member 12 provided on the detection unit 2 is engaged and locked, the airway adapter 1 can be accurately and three-dimensionally positioned and locked to the detection unit 2.
Further, by appropriately setting the angle of the mountain-shaped slope of the locking member 12, the direction in which the elastic member 11 presses the locking member 12 can be made different from the optical axis, and the light source 3 and the light receiving unit 7 The adverse effect of widening the interval can be reduced.
Further, the elastic member 11 and the airway adapter 1, and the locking member 12 and the detecting portion 2 can be integrally molded, respectively, and the number of parts can be reduced and the structure can be simplified.

In the above embodiment, the case where two pairs of elastic members 11 are provided so as to sandwich the detecting portion 2 has been described, but the elastic member 11 may be provided as only one pair. Further, only one elastic member 11a of the pair of elastic members 11 may be used. The shape of the locking member 12 is not limited to the mountain shape, and may be a round bar, for example.

Although the elastic member 11 is pushed inward by the locking member 12 and elastically deforms in the above embodiment, the locking member 12 is inside the elastic member 11 as shown in FIG. Alternatively, the elastic member 11 may be pushed outward and expanded.

The locking member may be fixedly provided on the side of the airway adapter 1 and the elastic member may be provided on the side of the detecting portion 2. However, in consideration of fatigue of the elastic member, the elastic member is provided on the side of the disposable airway adapter 1. Better.

[0020]

As described above, according to the airway adapter attaching / detaching mechanism of the breathing air of the present invention, the elastic member having the claw protruding integrally with the outer periphery of the airway adapter through which the breathing gas passes is integrally formed. Since the locking member is provided near the notch of the detection part where is fitted and is arranged in the detection part so as to lock the elastic member, the airway adapter can be accurately positioned and locked to the detection part with a simple structure. can do.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an embodiment of a breathing airway adapter attaching / detaching mechanism of the present invention.

FIG. 2 is an explanatory view showing a deformed state of the elastic member of FIG.

FIG. 3 is a plan view showing a state in which the detection unit of FIG. 1 is attached to a monitor body.

FIG. 4 is a perspective view showing the configuration of another embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a configuration of an example of a conventional carbon dioxide concentration measuring device.

6 is a side view showing the configuration of the detection unit of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Airway adapter 2 Detection part 2a Notch part 3 Light source 7 Photodetector (light receiving part) 11 Elastic member 12 Locking member

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 61-30848 (JP, U) Steady Sho 61-17650 (JP, U) Special Table 5-509026 (JP, A) Special Table 5- 500112 (JP, A) US Patent 5095900 (US, A) Takeda Park, "Recent Medical Measurement", Journal of Japan Electrostatic Society, Japan, Japan Electrostatic Society, January 31, 1993, Volume 17, No. 1, p. 39-46 (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01N 1/00-1/44 G01N 21/61 G01N 33/497 JISST file (JOIS)

Claims (2)

(57) [Claims] 1. An airway adapter attachment / detachment mechanism for breathing air, wherein an airway adapter through which respiratory gas passes is attached to a detection unit having a light source and a light receiving unit that are arranged opposite to each other on the same optical axis, across the optical axis. A pair integrally formed on the outer circumference of the airway adapter
An elastic member having a forming claw and a pair of engaging members provided in the detection unit so as to be provided in the vicinity of a notch formed in the detection unit into which the airway adapter is fitted and to lock the elastic member. and a stop member, and pushed the airway adapter to the notch
The claws are pushed by the ridges of the locking member and are pushed inward.
Elastically deformed, and further overcoming the above-mentioned mountain part and elastically deformed outward
An airway adapter attachment / detachment mechanism for breathing air, wherein the airway adapter attachment / detachment mechanism abuts on an inner slope of the locking member . 2. A light source and a light-receiver which are arranged to face each other on the same optical axis.
And an airway through which respiratory gas passes
A breathing air mount that attaches the adapter across the optical axis.
In the way adapter attaching / detaching mechanism, the pair formed integrally on the outer periphery of the airway adapter is attached .
The elastic member having the claws and the airway adapter formed on the detection part are fitted together.
Is provided near the cutout and locks the elastic member.
A locking member having a pair disposed in the detecting portion so that
And when the airway adapter is pushed into the notch
The pawl is pushed by the locking member and pushed outward.
An airway adapter attachment / detachment mechanism for breathing air, which is elastically deformed so as to be twisted , and further elastically deformed inward .