JPH0531184A - Blood detector - Google Patents

Abstract

PURPOSE:To provide a detector easy to maintain by discharging an internal solution beforehand in the washing of the inside thereof in a blood detector for a dialyzer to achieve the procedures of discharging and decomposing a solution simultaneously with a complicated procedure improved while facilitating the decomposition. CONSTITUTION:In a body which has a supply port 10 for supplying a dialysis solution from a dialyzer and a discharge port 11 for discharging it and is provided with a light source 3 and a photodetector 4 arranged as opposed thereto, a cup-shaped chamber 5a comprising a translucent material is provided between the light source 3 and the photodetector 4. The chamber 5a is made free to detach and a dialysis solution is retained in the chamber 5a to detect blood while in the decomposition and washing, the chamber 5a can be removed keeping the dialysis solution retained in the chamber 5a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blood detector, and more particularly to a blood detector for detecting blood leakage due to breakage of a semipermeable membrane of a dialyzer in a hemodialysis machine used for treating a patient with renal failure.

[0002]

2. Description of the Related Art Hemodialysis treatment of renal failure patients aims at removing blood waste and excess water by bringing blood into contact with a dialysate through a semipermeable membrane in a dialyzer. In this dialysis treatment, the hemodialysis device is a device for supplying the dialysate to the dialyzer and draining the dialysate waste liquid safely and surely. Therefore, the dialysis machine has various functions for ensuring safety. One of its functions is the detection of blood, and when the blood detector leaks blood to the dialysis drainage side due to the rupture of the semipermeable membrane due to a malfunction of the dialyzer or hemolysis, an alarm is generated and The device is shutting down.

An example of the structure of a conventional blood detector is shown in FIG. Side plates 2a and 2b are arranged on both sides of the container 1, the light source 3 is attached to the side plate 2a, the light receiving element 4 is attached to the side plate 2b, and the light source 3 and the light receiving element 4 are installed to face each other. A liquid supply port 10 and a liquid discharge port 11 are provided in the upper portion of the container 1, and the dialysis waste liquid is put into the container through the liquid supply port 10 so that the optical path from the light source 3 to the light receiving element 4 is filled with the dialysis waste liquid. ing. There are glass plates 5 between the side plates 2a and 2b and the container 1, respectively, and the dialysis drainage liquid inside the container 1 and the light source 3 and the light receiving element 4 are separated. When blood is mixed in the dialysis waste liquid, the light from the light source 3 is blocked by the blood, the amount of light incident on the light receiving element 4 is reduced, and it is detected that the blood is mixed in the dialysis waste liquid.

In the case of such a structure, when the stain on the glass plate requires cleaning, the liquid supply and drainage are first stopped and the drain screw 8 is loosened to drain the liquid in the container. Next, the set screw 7 is removed and the glass plate is taken out and washed.

[0005]

The conventional blood detector having the above-mentioned structure has the following problems. That is, in dialysis treatment, waste products and the like from blood flow into the dialysis drainage side, and the liquid itself is contaminated, and the drainage flow path is easily contaminated. The blood detector is also in the middle of the drainage path, and it is unavoidable that the inside gets dirty. Especially the light source 3 and the light receiving element 4
When the glass plate 5 on the optical path between the two becomes dirty, the amount of light incident on the light receiving element 4 decreases, and it becomes impossible to distinguish between the dirt and the mixing of blood, which causes a malfunction. Therefore, the glass plate 5 needs to be frequently washed, but in the conventional structure, the drain screw 8 drains the liquid in the container, the set screw 7 is loosened, and the glass plate 5 is removed to perform the complicated operation. Was needed.

The present invention has been invented in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a blood detector having a structure capable of easily cleaning the inside without the trouble of discharging a liquid.

[0007]

In order to solve the above-mentioned problems, the present invention uses a cup-shaped chamber made of an optically transparent material in a liquid retaining portion. That is, according to the present invention, in a blood detector provided in a dialysate line of a hemodialyzer, a main body is provided with a supply port for supplying a dialysate and a drainage port for discharging the dialysate, and the side surface of the main body is opposed to each other. And a light source and a light receiving element are provided, and a cup-shaped chamber made of a translucent material and having an opening in the upper part is between the light source and the light receiving element, and the liquid supply port and the liquid discharge port are provided in the opening. It is characterized in that the chamber is attached to the main body so that the edge of the opening is liquid-tight and the chamber is detachable.

[0008]

The dialysis waste liquid is injected into the chamber through the liquid supply port provided at the opening of the chamber and is discharged through the liquid discharge port above the chamber opening. The light source and the light receiving element are arranged so as to face the side surface of the chamber and detect blood that has entered the chamber. At the time of cleaning, the chamber can be removed together with the waste liquid remaining inside, and it is not necessary to discharge the internal residual liquid in advance.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the blood detector of the present invention. In the figure, 1a is a chamber holder, 3 is a light source, and 4 is a light receiving element, and a main body is constituted. 5a
Is a chamber, and 9 is a bottom plate.

The chamber holder 1a is made of a cylindrical material, and has a liquid supply port 10 and a liquid discharge port 11 provided on the upper portion thereof, and holes for mounting the light source 3 and the light receiving element 4 on the side surface of the cylinder.
Alternatively, the screws are processed so as to face each other, and the lower part is screwed on the cylindrical surface so as to be screwed with the bottom plate 9. The liquid supply port 10 and the liquid discharge port 11 do not need to be provided on the upper surface of the chamber holder 1a, and may be provided on the upper side surface, for example. Although a light emitting diode is used for the light source 3 and a photodiode is used for the light receiving element 4, any light emitting diode can be used as long as it can detect a change in the amount of light.

The chamber 5a is made of a translucent material, for example, transparent glass, and has a cup shape. An O-ring 6 is provided on the liquid supply port 10 and the liquid discharge port 11 side of the chamber holder 1a with the opening facing upward. It is tightly fixed via the via and serves as a retention part for the dialysis waste liquid. The chamber 5 a is fixed between the light source 3 and the light receiving element 4. Chamber 5a
The shape is not limited to a cylindrical shape and may be a rectangular shape, but the cylindrical shape is adopted in this embodiment because the manufacturing cost is low.

The bottom plate 9 is processed with a screw to be screwed with the screw portion of the lower portion of the chamber holder 1a, and the chamber 5a is brought into close contact with the chamber holder 1a by screwing with the screw portion of the chamber holder 1a. It may be possible to improve the stability of the chamber 5a by processing a recess for receiving the chamber 5a inside the bottom plate 9, or it is effective to knurl the outside so that the chamber 5a can be easily rotated by hand.

In the blood detector having the above structure, the dialysis waste liquid is injected into the chamber 5a through the liquid supply port 10 and discharged through the liquid discharge port 11. When blood leaks into the dialysis waste liquid, blood enters the chamber 5a together with the dialysis waste liquid, and the amount of light received by the light receiving element decreases, thereby detecting the blood leak. At the time of cleaning, the bottom plate 9 is loosened to remove the chamber 5a.
The chamber 5a can be taken out without removing the dialysis waste liquid remaining inside by removing the chamber. Therefore, since the blood detector can be easily washed, it can be washed frequently, and malfunction does not occur.

As described above, in the present embodiment, the chamber is held by the bottom plate 9 and is detachable, but the chamber may be directly attached to the chamber holder. For example, if a groove or the like is provided in the upper portion of the chamber and an attachment piece that fits into the groove is provided in the chamber holder, the chamber can be directly attached to the chamber holder.

[0015]

According to the conventional blood detector, when the glass surface needs to be cleaned, the procedure for draining the liquid in the container is required. It was done at the same time and could be easily disassembled. When dialysis is performed in a hospital, the glass surface of the blood detector is frequently washed, and the present invention reduces the procedure and simplifies maintenance.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a blood detector of the present invention.

FIG. 2 is a sectional view showing a conventional blood detector.

[Explanation of symbols]

 1a Chamber holder 3 Light source 4 Light receiving element 5a Chamber 6 O-ring 9 Bottom plate 10 Liquid supply port 11 Drainage port

Claims (1)

Claim: What is claimed is: 1. A blood detector provided in a dialysate line of a hemodialyzer, wherein a main body is provided with a supply port for supplying a dialysate and a drain port for discharging the dialysate. A light source and a light receiving element are provided facing each other on the side surface of the main body, and a cup-shaped chamber made of a translucent material and having an opening at the top is provided between the light source and the light receiving element, A blood detector, characterized in that the mouth is connected to the opening, the edge of the opening is liquid-tightly attached to the main body, and the chamber is detachable.