JPH0431075Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention detects blood leakage by coating shunts in blood extracorporeal circulation processing, the connecting part of the blood collection needle and blood circuit, the puncture part of the blood collection needle, etc. The present invention relates to a blood leak detector, particularly a blood leak detector housed in a container.

(Prior art and its problems) A large amount of blood leakage during extracorporeal blood circulation treatment may pose a danger to life, so it is important to detect it early.

In relatively short-term extracorporeal blood circulation treatments, such as hemodialysis and plasma separation, blood leakage can be detected early because the patient or the doctor monitors the treatment. However, recently developed wearable artificial kidney devices It is practically impossible to monitor blood leakage by humans in long-term extracorporeal blood circulation processes such as those using extracorporeal circulation lung assist devices.

Therefore, there is a demand for the development of a device that automatically detects blood leakage.

(Means for Solving the Problem) The present inventors proposed a device for automatically detecting blood leakage using two rows of flexible conductors (such as metal-plated fibers) each having a metal connector attached to one end. ) is a flexible base material (e.g. non-woven fabric) that has water absorption properties.
proposed a blood leakage detection device consisting of a blood leakage detection body sewn into the body, and a blood leakage detection circuit that issues an alarm when the electrical resistance between the two rows of conductors decreases due to blood leakage. No. 209524).

Since the blood leakage detector is used by covering the punctured part of the human body, it must be sterilized before use. However, in the above proposal, no consideration was given to sterilization of the blood leak detector. Therefore, an object of the present invention is to provide a sterilized blood leak detector.

The present invention is based on a blood leakage detector in which two rows of flexible conductors with metal connectors attached to one end are attached to a water-absorbing rectangular flexible base material using a polymer film with a non-moisture permeable surface. The back side has good ventilation,
The blood leakage detector is housed in a bag made of a sheet that does not allow bacteria to pass through, and the opening is sealed, and the bag containing the blood leakage detector is gas sterilized or superheated. This is a blood leak detector housed in a container.

(Example) Next, an example of the blood leak detector housed in the bag of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a blood leak detector 1 of the present invention, in which two rows of conductors 3 are attached to a water-absorbing base material 2. Water absorbent base material 2 is natural fiber,
It is made of a cloth-like body knitted or woven with synthetic fibers, non-woven fabric, paper, film, etc., absorbs water to form a continuous phase of water, and is flexible. Normally, nonwoven fabric or gauze is preferably used. Moreover, the shape used is rectangular.

The conductors 3 attached to the base material 2 in two rows may be of any type as long as they are flexible and conductive. For example, the diameter of tungsten, stainless steel, nickel, steel, etc.
Plated fibers, which are 0.05 to 2 mm electric wires, acrylic, vinylon, or other fibers plated with silver, copper, nickel, etc., are used.

In addition, conductive paints, such as those mixed with epoxy resin as a binder and powder of silver, aluminum, or copper particles with silver plating applied to the surface, or conductive ink used to print, apply, or It may also be attached to the surface of the substrate by dipping.

Furthermore, a film made of aluminum, copper, stainless steel, nickel, or the like may be attached to the surface of the base material.

In particular, the Metsuki fiber can be easily sewn into fibrous base materials such as non-woven fabrics, and since it has almost the same flexibility as the base material, it can be used suitably without causing any discomfort when attached to the human body. .

As shown in FIG. 1, these matte fibers 3 are arranged in two rows from the end of the base material 2 made of rectangular nonwoven fabric.
They are sewn into a comb-teeth shape so as to maintain a constant spacing, and a metal connector 4 is connected to the end to removably connect an electric circuit. This connector connects the conductor 3 and the electric circuit electrically and mechanically, and a known attachment/detachment mechanism can be employed.

The detection sensitivity can be adjusted by changing the spacing between the two rows of conductors. If this interval is narrow, the sensitivity will be high, and if this interval is wide, the sensitivity will be low. When plating fibers are attached to a non-woven fabric substrate, a blood leak of 1 c.c. can be detected within about 15 seconds at intervals of 8 to 20 mm, preferably 10 to 15 mm.

When the blood leakage detector is attached to the human body, if the blood leakage detector does not come into sufficient contact with the human body, malfunctions or detection delays 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 to at least both ends of the back surface (the surface that comes into contact with the human body) of the blood leak detector. By pasting the adhesive tape along the longitudinal direction of both ends of a rectangular blood leak detector, it is easy to attach it to the arm, etc., and it is reliable because both ends of the blood leak detector are completely adhesive-sealed to the human body. blood leakage can be detected.

As shown in FIG. 2, the blood leak detector 1 is housed in a bag 5 whose surface is made of a polymer film that is substantially non-permeable to moisture, and whose back surface is made of a sheet that has good air permeability and does not allow bacteria to pass through. be done.

Examples of substantially moisture-permeable polymer films include films made of polymers selected from the group of polyethylene, polypropylene, polyester, polyvinyl chloride, and polycarbonate. For gas sterilization, the polymer film can be appropriately selected from the above-mentioned polymer films, and for steam sterilization, polyester, polycarbonate, polypropylene, etc. can be suitably used. The thickness of polymer film is usually 80μ or more.
Particularly suitable is 80 to 100μ.

The breathable sheet can be appropriately selected from nonwoven fabric, cloth, and paper, and preferably has a thickness of about 100 μm.

The container bag 5 is made in the shape of a bag according to the size of the blood leakage detection object, and after containing the blood leakage detection object 1, the opening is sealed by heat welding or the like, and sterilized by a conventional method. That is, if the bag with the above-mentioned opening sealed is stored in the sterilization chamber and the pressure is reduced, the pressure of the bag becomes the same as that of the sterilization chamber through the breathable sheet. Then ethylene oxide,
Sterilization gas or heated steam of a specified concentration, such as propylene oxide, is introduced, and the bag is filled with gas or steam through a breathable sheet to sterilize it. When the bag 5 taken out from the sterilization chamber is used, the blood leak detector can be taken out from the bag by tearing it as shown by the dotted line from the notch 6 provided in the heat-welded part.

The blood leakage detector 1 taken out from the bag is wound into an arm band so as to cover the arteriovenous shunt 7 of the arm, as shown in FIG. Then, the alarm circuit 8 is connected to the connector provided at one end of the conductor. When blood leaks, the blood that permeates into the blood leak detection body lowers the electrical resistance between the two rows of conductors, energizing and activating the alarm circuit.

(Effects of the Invention) As described above, the blood leak detection body housed in the bag of the present invention is sterilized while being housed in the bag, so that the sterile state can be maintained until use.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the blood leakage detector of the present invention.
FIG. 2 is a plan view of the bag containing the blood leak detector, and FIG. 3 is a perspective view showing an example in which the blood leak detector is wrapped around the arm. 1... Blood leak detection body, 2... Base material, 3... Conductor, 5... Container bag.

Claims (1)

[Scope of utility model registration request] A blood leakage detector is constructed by attaching two rows of flexible conductors with metal connectors attached to one end to a water-absorbing rectangular flexible base material, and the surface is made of a non-moisture permeable polymer film. The inside of the bag is made of a sheet that has good ventilation and does not allow bacteria to pass through.
1. A blood leak detector housed in a bag, the opening of which is sealed, and the bag housing the blood leak detector is gas sterilized or superheated.