JPH0112177Y2 - - Google Patents

Description

[Detailed explanation of the device] This device can be attached to a pipette or piston-type syringe when collecting radioactively contaminated liquids such as cooling water reagent preparation liquids and waste liquids from various processes at nuclear facilities and providing them for analysis. Alternatively, the present invention relates to a sample liquid injection needle used alone to inject a sample liquid into a sample container.

FIG. 1 shows an example of the configuration of a sampling pot portion for collecting a sample liquid from a contaminated liquid. As shown in the figure, the sampling pot 1 includes a vertical, substantially cylindrical hollow section 2 in the center.
The lower part 2a of is the contaminated liquid 4 sent from the supply path 3.
constitutes a retention section in which the
The structure is such that the overflow is discharged through the overflow channel 5 to the discharge channel 6. 7 is supply route 3
An overflow channel 8 through which the excess flow directly flows down to the discharge channel 6 is an orifice that connects the bottom of the retention section 2a and the discharge channel 6. The upper part of the hollow part 2 is closed by a pot stopper 9, and a container accommodating part 11 into which a sample container 10 is inserted is formed on the side of the upper surface of the pot 1. A hole 9a communicating with the hollow portion 2 from the outside is opened in the pot stopper 9 in the vertical direction, and a sample collection pipette 12 is disposed upright with its lower part fitted into the hole 9a. Thus, the injection needle 13 attached to the lower end of the pipette 12 penetrates into the hollow portion 2, and its tip 8 is located within the orifice 13.

In the configuration shown in FIG. 1, in order to collect a sample liquid from the contaminated liquid 4, the pipette 12 is raised to the sampling position using an operating mechanism (not shown), and the sample liquid is aspirated through the injection needle 13 into the pipette 12. Next, the pipette 12 is pulled out from the pot 1 and moved onto the sample container 10, and at this moved position, the tip of the injection needle 13 is inserted into the container 10 by passing through the rubber cap (not shown) of the sample container 10. Inject the sample solution.

The most common type of injection needle is one with a diagonally cut tip as shown in Figure 2a, which is commonly used in syringes, etc. Therefore, it is necessary to avoid the spread of contamination due to this as much as possible, and since the above structure has poor liquid retention properties, there is a risk of contamination due to falling droplets during the movement process. In addition, since the droplet separation property at the tip is poor, there is also a problem in the quantitative performance of the sample liquid.Furthermore, as shown in the first diagram, the orifice 8 is positioned to protrude into the orifice 8 to prevent blockage due to adhesion of solid matter contained in the contaminated liquid. In this case, there is a drawback that the inner surface of the orifice 13 may be damaged due to a slight misalignment in the fitting position between the pipette 12 and the pot stopper 9. In addition, as shown in FIG. 3, when inserting the sample container 10 into the sample container 10, there is a risk that the section 14a of the rubber cap 14 may be cut off from the opening at the tip and enter the tube, thereby clogging the tube. On the other hand, the one with the tip cut horizontally as shown in FIG. 2B has the same drawbacks as FIG. 2A except for liquid retention, and it cannot be inserted into the sample container 10 through the rubber lid. Have difficulty.
Furthermore, although the one shown in FIG. 2C has no problems with damage to the orifice 8, liquid retention, and liquid separation, it is difficult to insert into the container 10, and moreover, it is likely to cause adhesion of components or blockage inside the container. In addition, the open tip types shown in FIGS. 2A, B, and C tend to attract sediment, resulting in poor representativeness of the sample liquid.

This invention was made in order to eliminate the above-mentioned drawbacks, and includes a short cylindrical pipette mounting member 15 having a tapered opening 15a, an upper end of which is fixed to the short cylindrical pipette mounting member 15, and A shaft member 16 having an open hollow portion 16a, an inner hollow portion 17a communicating with the hollow portion 16a of the shaft member 16 opening laterally at an intermediate portion, and a base portion 17b fitted inside the shaft member 16. The present invention relates to a sample liquid injection needle configured with a sharp tip member 17.

An embodiment of this invention will be described below based on the drawings.

As shown in FIGS. 4 and 5, the injection needle 13 includes a short cylindrical pipette mounting member 15 with a tapered opening 15a, a hollow shaft member 16, and a shaft member 16.
An inner hollow part 17a communicating with the hollow part 16a opens laterally at an intermediate part from the proximal end side, and the proximal end part 17a
and a sharp tip member 17 fitted inside the shaft member 16. Each of these members 15, 16,
The interconnecting parts 19a and 19b of 17 are joined by, for example, laser welding or nickel brazing, and the tip member 17 is made of SUS304 or the like, for example, and is treated with carbonization treatment or T:N treatment to increase hardness and improve durability. I'm letting you do it.

FIG. 6 shows how the injection needle 13 is inserted into the small diameter opening 19 at the lower end of the pipette 12 using the short cylindrical pipette mounting member 1.
5 is shown fitted and fitted externally. The pipette 12 has a sample liquid storage part 22 at its lower part, which has a gripping flange part 20 and a substantially conical pot fitting part 21 on its outer surface, a bellows part 23 at its middle part, and a washing liquid inlet 24 at its upper part. The sealing body 27 includes a bellows compression flange portion 25 and a top opening end sealed with a cap 26.

As described above, the injection needle for sample collection of this invention has an opening on the side, so it has excellent liquid retention and droplet separation properties, and can prevent contamination and deterioration of quantitative performance due to falling droplets. This method avoids the conventional drawback of easy suction of sediment, and enables the collection of a sample liquid with the original composition and properties.In addition, since the sharp end is located at the center of the shaft, even in the configuration shown in Figure 1, it is possible to collect a sample liquid with the original composition and properties. It has various advantages in that the orifice 8 will not be damaged if it is misaligned, and since the tip is not open, the blockage shown in the third figure will not occur, and insertion into the sample container is easy.

Since the sample liquid injection needle of the present invention is assembled by welding the separately processed pipette attachment member, shaft member, and tip member, the tip can be processed particularly precisely when manufacturing the tip member. At the same time, by processing the inner space of the tip member so that no liquid accumulates as shown in the figure, it is possible to obtain a sample liquid injection needle in which no liquid remains at the needle tip after cleaning.

In the above embodiment, a structure is shown in which the sample is attached to a pipette equipped with a bellows part, but it may be attached to a pipette-type sampler or a piston-type sampler with other structures, or the proximal end may be attached to a pipette with a bellows part. It may also be a single-use structure in which it is inserted and fixed into an evacuated sample container and the sample liquid is aspirated from the side-opening tip side.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing the structure of the sampling pot part, Figure 2 A, B, and C are vertical cross-sectional views of the tip of the injection needle shown for comparison, and Figure 3 is shown in Figure 2 A. 4 is a longitudinal sectional view showing the behavior of the injection needle, FIG. 4 is a longitudinal sectional view of an embodiment of the injection needle according to this invention, FIG. 5 is an enlarged longitudinal sectional view of the main part thereof, and FIG. FIG. 3 is a longitudinal cross-sectional view of a state in which an injection needle is attached to a sample collection pipette. 4... Contaminated liquid, 10... Sample container, 13...
...Injection needle, 18...opening, 29...opening.

Claims (1)

[Scope of utility model registration request] An injection needle for injecting a sample liquid collected from a contaminated liquid such as a cooling water reagent preparation liquid or waste liquid in a radioactively contaminated nuclear facility into a sample container,
A short cylindrical pipette mounting member having a tapered opening, a shaft member having an upper end fixed to the short cylindrical pipette mounting member and having an open hollow portion, and communicating with the hollow portion of the shaft member. 1. A sample liquid injection needle, characterized in that an inner cavity opens laterally at a middle portion, and a sharp tip member having a base fitted inside a shaft member.