JPS5920700Y2 - Detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detection device for detecting when a held object having a convex lens effect, such as a tube filled with liquid, is detached from its holding portion.

Conventionally, in infusion therapy, medicinal solutions are transferred to important points in the human body using transparent tubes.

For the purpose of detecting the presence or absence of a chemical solution in this tube, an empty liquid alarm device is provided in which a light emitting element is disposed on one side of the tube and a light receiving element is disposed on the other side.

In the case of this device, the alarm device is activated when the tube is in an empty state (no chemical liquid or the like is present in the tube, or a state in which air bubbles are generated in the tube).

However, if the tube between the light-emitting element and the light-receiving element is unexpectedly detached, the light emitted by the light-emitting element is directly received by the light-receiving element without any effect, and the amount of light is Condition (state where the tube is filled with liquid medicine, etc.)
It is almost equivalent to .

Therefore, when the tube is in a detached state, even if the inside of the tube becomes empty, the alarm device will not operate, and there is a risk that air will be supplied to the human body.

The purpose of the present invention is to provide a detection device that eliminates the above-mentioned drawbacks, and the gist thereof is to include a holding part that holds a held object having a convex lens action, and a holding part that holds a held object and which is arranged on one side with the held object held in between. a light projecting part and a sensing means arranged on the other side for sensing light from the light projecting part; and a light shielding for blocking the light to such an extent that the sensing means cannot sense the light when the object to be held is detached from the holding part. There is a detection device comprising means.

Hereinafter, the present invention will be described in detail according to an embodiment in which the present device is applied to an empty fluid alarm device that warns of an empty fluid state in an infusion tube during infusion therapy.

1 indicates an empty/liquid alarm device, and 2 is its casing.

The housing 2 is formed with a guide part 4 and a narrow part 5 that communicate with the holding part 3.

Furthermore, a light emitting element 6 serving as a light projecting part is embedded on one side of the holding part 3, and a light receiving element 7 serving as a sensing means is embedded on the other side.

Lead wires 8 and 9 have one end connected to the light emitting element 6 and the light receiving element 7, respectively.

The other end of the lead wire 8 is connected to a power source (not shown).
The other end of the lead wire 9 is connected to an alarm device such as a buzzer (not shown).

The alarm is configured to operate when the light receiving element 7 receives an amount of light below a predetermined level.

Reference numeral 10 indicates a transparent tube held in the holding portion 3, and reference numeral 11 indicates a transparent drug solution filled in the tube 10.

Note that the object to be held refers to a tube 10 filled with a chemical solution 11 as shown in FIG.
has a convex lens effect.

Reference numerals 12 and 13 are small holes for projecting light from the light emitting element 6 toward the tube 10, and 14 is a light shielding portion serving as a light shielding means.

The size of the light shielding part 14 is determined by the size of the light emitting element 6 in the state shown in FIG.
The size is set such that the amount of light received by the light-receiving element 7 due to the light emitted from the light receiving element 7 is below the predetermined level.

The operation of the empty/liquid warning device having the above configuration will be explained below.

Place the tube 10 on the guide part 4 of the empty/liquid alarm device 1 in the state shown in FIG. do.

After this attachment, when infusion of the transparent drug solution 11 is started in a conventional manner, the inside of the tube 10 becomes in a liquid state, and the power source is turned on in this liquid state.

This ON operation causes the light emitting element 6 to emit light, and this light is transmitted to the small holes 12 and 13. The light continues to be projected onto the light receiving element 7 through the tube 10 which is integrated with the chemical solution 11 and has an optically convex lens effect.

The amount of light received by this light receiving element 7 is above a predetermined level and the alarm is not activated.

Note that the light projected onto the light shielding section 14 is blocked by the light shielding section 14 and does not reach the light receiving element 7 .

As the infusion progresses and the inside of the tube 10 reaches an empty state as shown in FIG. 3, the tube 10 loses its convex lens effect, and the light from the light emitting element 6 is repeatedly reflected and refracted by the tube 10, and is significantly attenuated. The light reaches the light receiving element 7.

Since the amount of light reaching the light receiving element 7 is below a predetermined level, the light receiving element 7 activates an alarm to notify the empty liquid in the tube 10.

On the other hand, if the tube 10 is accidentally detached from the holding part 3 during the infusion, the convex lens effect is lost, so the amount of light reaching the light receiving element 7 through the small holes 12 and 13, and even the amount of received light, will be reduced. When the temperature drops below a predetermined level, an alarm is activated to notify you.

Note that when the tube 10 is detached from the holding part 3, if the light shielding part 14 is omitted, the amount of light reaching the light receiving element 7 increases by that amount and exceeds the above predetermined level, causing an alarm. may not work.

In the present invention, the light shielding part 14 is provided to ensure that the amount of light reaching the light receiving element 7 is below a predetermined level when the tube 10 is detached, thereby ensuring that the alarm is activated.

To complete the above-mentioned infusion or remove the tube 10 from the holding part 3 if necessary, after turning off the power, the tube 10 may be grasped with fingers and pulled out in the direction of the guide part 4.

In the above embodiment, the light emitting element 6 and the light receiving element 7 are used not only for the purpose of detecting detachment of the tube 10 but also for the purpose of detecting empty liquid within the tube 10.

However, the invention is not limited to this, and independent light emitting elements and light receiving elements may be provided for each purpose.

Further, although the light emitting element 6 is used as the light projecting section and the light receiving element 7 is used as the sensing means, the present invention is not limited to these.

Furthermore, in the above description, transparent also includes translucent.

Further, the light shielding section 14 as a light shielding means is provided on the light emitting element 6 side, but is not limited thereto, and may be provided on the light receiving element 7 side.

Furthermore, the light projected by the light projecting section is not limited to visible light.

As described above, the detection device according to the present invention is capable of quickly and reliably detecting detachment of a held object with a simple configuration, even if the object is detached from the holding portion against one's will.

That is, by providing the light shielding means, it is possible to ensure that the amount of light reaching the sensing means is below the detection level when the held object is detached from the holding section.

Therefore, the detection device according to the present invention is particularly suitable as a device for detecting detachment of a held object such as a medical device that affects the survival of life.

Further, in the case of the configuration of the embodiment, it is possible to detect not only the detachment of the tube as the object to be held, but also the presence or absence of liquid in the tube.

[Brief explanation of drawings]

The drawings show an embodiment in which the detection device according to the present invention is applied to an empty/liquid alarm device, and FIG. 1 is a cross-sectional view showing a state in which the holding part does not hold a tube as a held object, and FIG. FIG. 3 is a sectional view showing a state in which a tube filled with a drug solution is held in the holding portion, and FIG. 3 is a sectional view showing a state in which there is no drug solution in the tube held in the holding portion. 3...Holding part, 6...Light emitting element as light projecting part, 7...Light receiving element as sensing means, 10...
...Tube constituting the held object, 11...
- Chemical liquid constituting the held object, 14...A light shielding section serving as a light shielding means.

Claims (1)

[Scope of utility model registration request] A holding part that holds a held object having a convex lens effect, a light projecting part disposed on one side of the held object held by the holding part, and a light projecting part that holds the held object between the light projecting part and the held object. a light sensing means disposed on the opposite side to the - side; and a light sensing means arranged to block light from the light projecting section to such an extent that the sensing means does not detect it when the holding section does not hold the object to be held. and a light shielding means, wherein light from the light projecting section is focused by the convex lens action and sensed by the sensing means when the object to be held is held by the holding section. Characteristic detection device.