JPS6269136A - Liquid leak detector - Google Patents

Abstract

PURPOSE:To improve safety of the titled detector by holding flexible base material having absorbency between two flexible sheet-shape electric conductors and incorporating a circuit main body with the base material. CONSTITUTION:The base materials 1 having an opening is wound in an arm-belt shape round a part where a liquid transfusion needle 7 of the tip of a liquid transfusion circuit 6 connected with a liquid transfusion bottle 5 is stuck and fixed thereon. The base material 1 is formed of nonwoven cloth or the like and the materials absorbing the water and forming a continuous phase of the water and moreover, having flexibility is used. Further, both the surfaces of the base material 1 are held between the sheet- shaped electric conductors 10 and 10' having flexibility and connectors 11 and 11' to connect with the circuit main body 4 are connected with the electric conductors 10 and 10'. Further, the detection sensitivity of a transfusion liquid leak can be adjusted by the thickness of the base material 1. Then, when the base material 1 is fitted to a necessary part and the circuit main body 4 is connected with the connectors 11 and 11' connected with the electric conductors 10 and 10', in case there is the leaks of the transfusion liquid, the electric resistance between the two electric conductors 10 and 10' is lowered by the moisture infiltrating into the base material 1 and an electric current is applied and an alarm is sounded by an action of an electric circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a liquid leakage detection device, and in particular to a device for detecting liquid leakage, particularly for detecting blood leakage from a shunt in extracorporeal blood circulation, a joint between a blood collection needle and a blood circuit, a punctured part of a blood collection needle, etc. leakage.

Or, it relates to a device useful for detecting leakage of infusion fluid from the puncture site of an infusion needle during infusion0 (Prior art and problems) A large amount of blood leakage during extracorporeal blood circulation can be life-threatening. In addition, since leakage of transfusion hinders effective treatment, it is extremely important to detect leakage of digits and transfusion at an early stage.

In conventional blood dialysis, plasma separation, and other relatively short-time extracorporeal blood circulation treatments, blood leaks are monitored by the patient or their doctors, which makes it possible to detect blood leaks early and prevent the next step. In the case of long-term extracorporeal blood circulation treatment, such as the recently developed wearable artificial kidney, extracorporeal circulation lung support, it is impossible for conventional human monitoring of blood leakage.

However, no device has been proposed to date that automatically detects leakage of blood or transfusion fluid.

(Means for Solving the Problems) It is therefore an object of the present invention to provide an apparatus for automatically detecting leakage of liquids, particularly blood or transfusions. The liquid leak detection device of the present invention has two flexible, water-permeable or water-absorbing sheet-like conductors connected to connectors on both sides of a readable, water-absorbing base material, Moreover, the present invention is characterized in that the conductor and the main body of the detection circuit are detachably connected by a connector 1, and liquid leakage is detected by reducing the electrical resistance between the conductors.

(Function) The device of the present invention is a conventional method for detecting wetness of a diaper, in which two conductors are placed apart, and when the electrical resistance decreases due to permeated urine, a current flows between the two conductors. However, in reality, the conductor placed on the base material is a point electrode that can only detect local leakage, and it is also mechanically strong. Therefore, it lacks flexibility and cannot be used in areas that come into direct contact with the human body.2 Moreover, the detection circuit and base material are connected by lead wires, making the device complex and causing problems such as poor insulation. Therefore, this problem can be solved by sandwiching a water-absorbing and readable base material between two flexible sorted conductors and integrating the circuit body and the base material.

We have been able to provide a compact leakage detection device that is free from malfunctions and can be safely used even on parts that come in contact with people.

(Embodiment) Next, an embodiment of the error detection device of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing a state in which a device for detecting surface liquid leakage during extracorporeal circulation treatment is attached to an arm, and the base material 1 sandwiched between two sheet-like conductors is moved by the movement of the arm. 2. The conductive band is wrapped in a wrist band shape so as to cover the upper part of the 2' section, and the circuit main body 4 is detachably connected to the end of the sheet-like conductive band.

FIG. 2 is a perspective view showing a device for detecting infusion leakage in an infusion wrapped around the arm, and is connected to an infusion bottle 5, and the tip of the nine-wheel semi-circuit 6 is punctured by the number 7. Does it have an opening? & The material 1 is wound and fixed in the shape of an armband as in Figure 1.0 Is the water-absorbing base material 1 sandwiched between two sheet-like conductors natural? A cloth-like body knitted or woven with fibers, synthetic fibers, or non-woven fabrics5 paper, film, etc., and absorbs water to form a continuous phase of water.

Moreover, it is flexible. Normally, nonwoven fabric or gauze is preferably used. Further, any shape can be used depending on the mounting location.

When it is wrapped around the arm, a long sword shape is preferable.

Any sheet-like conductor attached to both sides of the base material J may be used as long as it is foldable and conductive. For example: /g/(fn, stainless steel, nickel, copperfZt (DM diameter approx. 0.05~2
The average diameter of the holes or the mesh spacing is preferably 0.5μ to 5+m+h, such as fin electric wires, plated fibers made of acrylic or vinylon fibers plated with silver, copper, nickel, etc., or elongated films made of aluminum, nickel, steel, etc. 0
．． A sheet-like sauce pasted on a weave of 5 μm to 3 m (fc#) can be used.

In particular, plated fibers can be easily woven or knitted, and have excellent flexibility, so they can be suitably used without causing discomfort when attached to the human body.

The sheet-like conductor 10 made of plated fibers has a rectangular shape as shown in FIG. 3, and a connector 11 is connected to the end thereof to detachably connect a circuit body to be described later. This connector electrically and mechanically connects the four electric bodies and the circuit body, and can employ a known attachment/detachment mechanism made of gold J1i. In FIG. 3, a commercially available hook is used, which is easy to attach to a non-woven fabric and is inexpensive.

The detection sensitivity of liquid leakage can be adjusted to a total of 8 depending on the thickness of the base material 1 sandwiched between the two sheet-like conductors. The thinner the base material, the higher the sensitivity, and the thicker the base material, the lower the sensitivity.

When a nonwoven fabric with a thickness of 0.5 m is attached between a sheet-like conductor made of plated fibers woven at two-layer intervals as shown in Figure 3, leakage of ICC0 liquid can normally be detected within about 1.5 seconds. It is preferable to cover the base material and the conductor with a protective sheet 9 against damage caused by external forces. Such a water absorbent sheet f
The important thing is that it has water absorbency like the base material, and is also flexible. Usually non-woven fabric or paper-like material is used. The electric conductor, the base material, and the protective sheet can all be integrated by sandwiching the base material to which the sheet-like conductor is attached between two sheets and inserting the peripheral edges of the two sheets.

When attaching the base material to the human body, if the base material does not come into close contact with the human body, a malfunction may occur and a delay in detection may occur. In order to avoid this detection trouble and to facilitate attachment to the human body, it is preferable to attach double-sided adhesive tape 13 to at least both ends of the back surface (the surface in contact with the human body) of the protective sheet.

By attaching the adhesive tape to both ends of the rectangular protective sheet along its length, it is easy to attach it to the arm, etc., and since both ends of the base material are completely adhesive-sealed to the human body, blood can be reliably removed. 'e, leakage can be detected.

When using a ring-shaped conductor to detect leaks such as infusions, paste adhesive tape over the entire surface of the protective sheet. 1. When installing on the human body, sometimes place the KWti standard needle inside the opening in the center of the base material. Use by pasting it on the surface of the skin J4 in a circular motion.

The circuit main body 4 can be constructed from a known S-report circuit.

For example, as shown in Fig. 5, it is composed of a sensitivity setting circuit 21, a comparison circuit 22, and an alarm buzzer 23, and a reference resistor and a conductor are connected in series to the power supply voltage.
A comparison circuit compares the change in voltage with a preset sensitivity voltage, and when the voltage falls below the set voltage, a buzzer is activated.

The buzzer stops when the circuit body is removed from the base material.

Instead of operating with a constant voltage as shown in FIG. 5, it may be operated with a constant current. Alternatively, the setting signal of the comparator circuit may be fixed by making the fc reference resistance variable. The circuit main body can also be composed of a commercially available melody IC 24, a piezoelectric buzzer 25, and a battery 26 as shown in FIG. In this case melody I
If C is operated in a one-way yacht type manner, it will be possible to play a predetermined melody for a certain period of time when a discrepancy is detected.

It is also possible to perform remote wireless monitoring using the alarm buzzer as a transmitter. In this case, blood leakage can be centrally monitored by making each detection device emit a signal of a different wavelength and attaching a corresponding lamp to the monitoring system.

The circuit body 4 has a connector 11.11 connected to the conductor 10.10 and a connector 14.
is connected. When a hook as shown in FIG. 3 is used as a connector, a corresponding hook is also attached to the circuit body. Connect the circuit body and 4 with such a connector.
Since the electric body is integrated, it is convenient to handle the device, and troubles such as poor insulation can be completely prevented.

To use the device of the present invention, as shown in Fig. 1'1' or Fig. 2, apply the base material on which the sheet-like conductor is attached to the required area, and then attach the coil and lid connected to the four electric bodies. The circuit main body 4 is connected to the circuit body 4. When fluid passes through or leaks, the water that permeates into the base material lowers the electrical resistance between the two T-shaped conductors, causing current to flow and affecting the operation of the electrical circuit.
#A warning will be issued. Note that since a low voltage of 3V or less is sufficient for detecting the presence or absence of current, there is no danger at all even if the four electric bodies come into direct contact with the human body.

The device of the present invention is the above-mentioned blood therapy device. In addition to detecting infusion leaks, it can also be used to detect urination and defecation in diapers.

(Effects) As mentioned above, the liquid leakage device H'r of this invention has sheet-like 4-electric bodies attached to both sides of the flexible base material, so bending and bending is easy. It can be installed optimally on the human body, and since the circuit body and the base material are integrated, it can be made into a compact device that does not break down.

[Brief explanation of drawings]

Figures 1 and 2 are perspective views showing the device of the present invention in use, Figure 3 is a plan view of the iL relaxation body, and Figure 4 is a sectional view showing the state covered with a protective sheet. 5 and 6 are circuit configuration diagrams. l...Base material 4...Circuit body 10.
10...2s electric body

Claims (1)

[Claims] 1. Two flexible sheet-like conductors each connected to a connector and having water permeability or water absorption are arranged on both sides of a flexible base material having water absorption. A liquid leakage detection device characterized in that the conductor and the detection circuit body are detachably connected to each other by a connector, and liquid leakage is detected by a decrease in electrical resistance between the conductors. 2. Sheet-like conductors placed on both sides of the flexible base material,
The liquid leak detection device according to claim 1, further comprising a protective sheet that is flexible and has water absorption properties. 3. The liquid leakage detection device according to claim 2, wherein a double-sided adhesive tape is bonded to at least both ends of the back surface of the protective sheet.