JPH0118178Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a liquid filtration device that can efficiently filtrate a liquid having the same viscosity as blood by using air pressure.

Conventionally, the one shown in Figure 1 has been known as a liquid filter having a viscosity similar to that of blood. This filter 1 has a cone-shaped upper casing 3 having a liquid injection hole 2 on the top surface, and a funnel-shaped lower casing 5 having a drain pipe 4 in the center of the inner bottom surface, which are joined by a flange with a plate-shaped material 6 in between. A rib 7 is provided on the inner bottom surface of the lower housing 5 to support the material 6, and a needle attachment part of a syringe (not shown) can be tightly inserted into the inner surface of the outer end of the drain pipe 4. A tapered surface 8 is provided. This filter 1 sucks the liquid injected into the upper housing 3 through the liquid injection hole 2 using a syringe connected to the drain pipe 4 of the lower housing 5, and maintains the inside of the lower housing 5 at negative pressure. However, it is necessary to hold the syringe in a suction state using a certain jig (not shown) until the required amount of liquid has passed through the syringe. Not only is it troublesome, but since the superfluous liquid flows into the cylinder of the syringe for suction, when using the superfluous liquid as a test sample, it must be transferred to a test tube, etc., which is troublesome, and the syringe There were various problems such as excess liquid adhering to the tank leading to loss.

This idea was developed to solve the above problem, and consists of a syringe-shaped main body with a liquid drain pipe protruding from the bottom of the cylinder, and a lid body with a liquid injection pipe fixed to the upper end surface of the main body. Then, a material is loaded into the inner surface of the cylindrical butt part of the main body through a certain gap, and a check valve is formed at an appropriate position in the liquid injection pipe, and a liquid with a viscosity similar to blood is injected with a syringe along with excess air. By injecting into the main body from the pipe, high pressure is created in the space inside the main body above the material, and the air pressure allows the liquid to pass through, while the check valve prevents the high pressure from being maintained for a long time. The purpose is to provide a liquid filter that can be maintained.

Next, this invention will be explained based on the embodiments shown in the drawings from FIG. 2 onwards.

Reference numeral 10 denotes a syringe-shaped main body with a drain pipe 12 protruding from a barrel end 11, and the main body 10 is molded from transparent or translucent synthetic resin or glass.
When using synthetic resin, use a material with low chemical adsorption (e.g. polypropylene, polyethylene, etc.) in order to accurately examine the effluent as a test sample.
Good. Reference numeral 13 denotes a lid plate fixed to the upper end of the main body 10, and the lid body 13 is equipped with a liquid injection pipe 14. The means for fixing the main body 10 and the lid 13 is not particularly limited. The liquid injection tube 14 has a luer taper 15 on the inner surface of its outer end so that the needle attachment part 17 of the syringe 16 can be inserted tightly therein. Reference numeral 18 denotes a material loaded onto the inner surface of the cylindrical butt part of the main body 10 through a certain gap 19, and the outer circumferential surface of the material 18 is in close contact with the inner circumferential surface of the main body 10. This material 18 must be loaded with a supporter (not shown) in the case of an ultrafiltration membrane that is itself thin. The void 19 can be formed by providing radial ribs 20 on the inner surface of the cylinder tail 11 as shown in FIG. 3A, or by making the inner surface of the cylinder tail 11 funnel-shaped as shown in FIG. 3B. However, if there is any other suitable means (such as carving a groove on the inner surface of the cylinder butt), you are free to use it.

Reference numeral 21 denotes a check valve provided on the inner end surface of the liquid injection pipe 14 of the lid body 13.
However, as shown in FIG. 4A, a downward step 22 is provided in the middle of the liquid injection pipe 14, and the valve body 21 of the step 22
A may be partially fixed, or an annular groove 23 may be provided in the middle of the liquid injection pipe 14, and the valve body 21a may be inserted into the groove 23.
may be freely loaded.

As described above, this device consists of a syringe-shaped main body with a drainage pipe protruding from the barrel end, and a lid body having a liquid injection pipe fixed to the upper end surface of the main body. Load the material through a certain gap on the inner surface of the part,
In addition, since a check valve is formed at an appropriate position in the liquid injection pipe, when passing a viscous liquid such as blood, first inhale an appropriate amount of the liquid into the syringe, and then insert the liquid into the syringe. Intake air in an amount equal to or greater than the amount of liquid (or vice versa). Then,
Liquid injection pipe 14 with a needle attachment part of the syringe provided on the lid body 13
If the liquid is injected into the main body 10 along with excess air by connecting to the main body 10, the space above the material 18 in the main body 10 will be in a high pressure state. This high pressure state is maintained continuously by the action of the check valve 21 even after the syringe is removed from the injection pipe. Therefore, the liquid injected into the main body 10 is gradually permeated through the material 10 due to the air pressure inside the main body 10, and is passed through the drain pipe 12 from the inner surface of the cylinder butt 11 into a container such as a test tube. (not shown).

As described above, according to this invention, by simply sucking excess air together with the liquid into the syringe and injecting it from the liquid injection pipe, the pressure inside the main body 10 can easily become high, and this state can be controlled by the action of the check valve. Since the syringe is maintained for a long period of time, viscous liquids such as blood can be easily evacuated as long as there is a device to lean the main body 10 against, and there is no need for a jig to hold the syringe in the suction state for a long time as in the past. Instead, the excess liquid can be collected directly into a container such as a test tube, so there is no loss of sample.
Further, even when the air pressure inside the main body 10 decreases over time, it provides various excellent effects such as easily reproducing the high pressure state by connecting the syringe again and injecting only air.

[Brief explanation of the drawing]

Fig. 1 is a sectional front view showing a conventional example, Figs. 2 to 4 show an embodiment of this invention, Fig. 2 is a sectional front view, and Figs. 3 A and B are enlarged perspective views of the cylinder butt. 4A and 4B are enlarged sectional views showing other examples of check valves. 10... Main body, 11... Cylinder end, 12... Drain pipe, 13... Lid, 14... Liquid injection pipe, 18...
Material, 21...Check valve.

Claims (1)

[Scope of utility model registration request] It consists of a syringe-shaped main body with a liquid drain pipe protruding from the cylindrical butt part, and a lid body having a liquid injection pipe fixed to the upper end surface of the main body, with a certain gap being interposed on the inner surface of the cylindrical butt part of the main body. A fluid container having a viscosity such as that of blood, which is loaded with a liquid material and having a check valve formed at an appropriate position in the fluid injection pipe.