JPH03257341A - Two-statge type syringe - Google Patents

Abstract

PURPOSE:To remove the bubbles mixed with a liquid within a weightless region by pushing a large piston and a small piston mutually threaded in a detachable manner in the large diameter part of a cylinder and continuously separating the small piston to push the same in the small diameter part. CONSTITUTION:A cylinder 16 is filled with a desired liquid and a small piston 20 is threaded with the hole 26 of a large piston 18 through screw parts 18a, 20a in a detachable manner to fix both piston 18, 20 and a cap 24 is mounted to keep or transport the syringe thus formed. During this period, there is possibility generating bubbles 50 in the liquid. Next, when the liquid is taken out, the cap 24 and the fixed parts are detached at first and the pistons 18, 20 are pushed in to move the large piston 18 along the inner surface of the large diameter part of the cylinder 16 at first and the liquid in the cylinder 16 is discharged from a nozzle 22. At this time, the high speed flow of the liquid is generated in the small diameter part 12 of the cylinder 16 and the bubbles 50 contained in the liquid are carried by the flow to be discharged from the nozzle 12. Thereafter, the small piston 20 is separated from the large piston 18 and pushed in the small diameter part 12 to make it possible to take out the liquid containing no bubbles 50 in a proper flow rate.

Description

[Detailed Description of the Invention] [Summary] The purpose of this invention is to provide a two-stage syringe capable of removing bubbles that can be easily used even in space, and to provide a cylinder having a small diameter portion and a large diameter portion, and the cylinder having a small diameter portion and a large diameter portion. It consists of a large piston that can fit into the inner surface of the large diameter portion and a small piston that can fit into the inner surface of the small diameter portion of the cylinder, and when the small piston is pushed in, the large piston and the small piston The small piston is configured to move while sliding along the inner surface of the large diameter portion, and then the small piston is separated from the large piston and can move while sliding along the inner surface of the small diameter portion of the cylinder.

[Industrial application field]

The present invention relates to a two-stage syringe capable of removing bubbles contained therein. More particularly, the present invention relates to a two-stage syringe that is capable of removing bubbles mixed with a liquid in a zero gravity area and extracting a bubble-free liquid.

When handling a liquid mixing device in space, the liquid components to be processed are filled into a liquid storage container such as a syringe on the ground, transported to space, and then the liquid is extracted from the liquid storage container (1) (2). It becomes necessary.

However, the liquid in the liquid storage container may contain bubbles during filling, or bubbles may form from the liquid during subsequent storage. It is often desired to remove internal bubbles when removing liquid from such liquid storage containers.

[Conventional technology]

Many techniques are known for removing foam contained in containers. Most familiarly, it is known to point the needle upwards and expel the bubbles along with the liquid before injecting. It is likewise known to provide a bubble removal channel in the upper region of the container. In addition, we use a centrifugal bubble removal device that rotates the container at high speed, or fills one of two chambers separated by a gas exchange membrane with liquid, and applies negative pressure to the opposite chamber to remove bubbles that adhere to the membrane interface of the chamber. There are also devices that remove by adding. Alternatively, there is a method of chemically removing foam by adding an oily substance with low volatility and high diffusivity, a water-soluble surfactant, or an antifoaming agent such as silicone oil to the liquid.

[Problem to be solved by the invention]

Removing bubbles using the principle of a syringe is a simple and effective method on Earth, where there is gravity, but in space, where gravity is small, bubbles no longer float on top of the liquid, so it is not effective even if the needle is pointed upwards. Unable to remove bubbles. Similarly, bubble removal channels provided in the upper region of the container cannot effectively remove bubbles in the low gravity of space. In addition, the centrifugal bubble removal device described above and the device equipped with a gas exchange membrane require relatively large devices, and cannot be said to be able to easily remove bubbles, making them unsuitable for use in space. . Also,
Using antifoaming agents adds impurities to the liquid and is often unsuitable for anything other than special uses.

An object of the present invention is to provide a two-stage syringe capable of removing bubbles that can be easily used even in space.

[Means to solve the problem]

The two-stage syringe of the present invention includes a cylinder having a small (3) (4) diameter part having a nozzle and a large diameter part continuous to the small diameter part, and a cylinder inserted into the cylinder and having a large diameter part of the cylinder. It consists of a large piston that can be fitted on the inner surface of the cylinder, and a small piston that is detachably attached to the large piston and that can be fitted on the inner surface of the small diameter part of the cylinder. The large piston moves along the inner surface of the large diameter part of the cylinder, and then the small piston is separated from the large piston so that it can move along the inner surface of the small diameter part of the cylinder.

[Effect]

In the above-mentioned horizontal throttling, when the small piston is pushed in, the large piston first moves along with the small piston along the inner surface of the large diameter part of the cylinder, and the liquid filled in the cylinder is passed through the nozzle at the tip of the small diameter part. discharge from. Therefore, a high-velocity flow of liquid is generated within the small diameter portion of the cylinder, and the bubbles contained within the cylinder are carried by the high-velocity flow of the limb and expelled from the nozzle. The small piston is then separated from the large piston and moved along the inner surface of the small diameter portion of the cylinder, allowing bubble-free liquid to be removed at the appropriate flow rate.

〔Example〕

1 and 2, the two-stage syringe lO according to the first embodiment of the present invention includes a cylinder 16 having a small diameter portion 12 and a large diameter portion 14 continuous to the small diameter portion 12;
a large piston 18 that can fit into the inner surface of the large diameter portion 14 of No. 6;
It consists of a small piston 20 that can fit into the inner surface of the small diameter portion 12 of the cylinder 16. A nozzle 22 is provided at the tip of the small diameter portion 12, and a cap 24 is attached to cover the nozzle 22.

The large piston 18 is formed into a disk shape with a hole 26 in the center, and the small piston 20 is detachably attached to the hole 26 of the large piston 18. In the first embodiment, the hole 26 of the large piston 18 and the small piston 20
Engageable screws 18a, 20a are provided on the outer periphery of the small piston 20 (5) (6), so that the small piston 20 (5) (6) is screwed into the hole 26 of the large piston 18. By rotating the small piston 20 relative to the large piston 18, the small piston 20 can be separated from the large piston 18. Further, a piston rod 28 is attached to the small piston 20 and extends coaxially therewith. Furthermore, the small diameter portion 12 of the cylinder 16
A screw 12a that can be engaged with the screw 20a of the small piston 20 is provided on the inner surface of the piston. However, if the fitting clearance between the small piston 20 and the small diameter portion 12 of the cylinder 16 is small, the thread 12a on the inner surface of the small diameter portion 12 of the cylinder 16
can be omitted. Furthermore, a measuring scale 30 is formed on the outer surface of the small diameter portion 12 of the cylinder 16.

In use, as shown in FIG.
6 is filled with a desired liquid, the small piston 20 is fixed to the large piston 18, this is fitted into the cylinder 16, and the cap 24 is attached. 18 is fixed to the cylinder 16. In this way, the two-stage syringe IO can be stored or transported with the liquid filled. Foam 50 may form during such storage and transportation.

When taking out the filled liquid from this two-stage syringe 10, remove the cap 24 shown in FIG.
and allows the large piston 18 to move relative to the cylinder 16. Therefore, when the small piston 20 is pushed in, the large piston 18 moves along with the small piston 20 while sliding along the inner surface of the large diameter part 14 of the cylinder 16, and the liquid filled in the cylinder 16 is transferred to the small diameter part 14. The liquid is discharged from the nozzle 22 at the tip. In this case, the liquid in the small diameter portion 12 of the cylinder 16 with a small cross sectional area is driven by the action of the large piston 18 (and small piston 20) with a large cross sectional area. A high-speed flow of liquid occurs, and this high-speed flow of liquid flows into cylinder 1.
The bubbles 50 contained in the bubbles 6 are caused to move in a fixed direction.

(7) (8) When this two-stage syringe 10 is used in space where gravity is small, the bubbles 50 contained within the cylinder 16 are not affected by gravity, so it is opposite to gravity like on the ground. When the nozzle 22 is pointed upward, the bubbles 50
are not necessarily concentrated near the nozzle 22. However, in this two-stage syringe 10, the foam 50 is
6, the large piston 18 is moved within the cylinder 16 along with the small piston 20 as described above, causing a high-velocity flow of liquid within the small diameter portion 12 of the cylinder 16, and causing a flow of liquid within the cylinder 16. 50 bubbles contained in
As a result, the bubbles 50 are drawn toward the nozzle 22 as if receiving buoyant force, and are carried by the high-speed flow of liquid to the nozzle 22.
discharge from.

As shown in FIG. 1, according to the considerations of the inventor of the present invention, under a zero-gravity condition with small gravity similar to being in space, a bubble 50 sealed in a container such as a two-stage syringe 10 It was found that there was a tendency for the particles to gather in the center of the container. In addition, the bubbles 50 sealed in the container gather in granular form, centering around relatively large bubbles, and do not grow into one large bubble. In the two-stage syringe 10, such a collection of bubbles 50 tends to gather near the boundary between the small diameter section 12 and the large diameter section 14. Therefore, creating a high velocity flow of liquid within the small diameter portion 12 of the cylinder 16 ensures that the bubbles 50 are directed toward and expelled from the nozzle 22 .

Then, when the large piston 18 reaches near the step between the small diameter section 12 and the large diameter section 14, the small piston 20 is separated from the large piston 18 by rotating the small piston 20, and only the small piston 20 is attached to the cylinder 16. Small diameter portion 12 of
move along the inner surface of. In the embodiment, the small piston 20 is rotated so that the thread 20a of the small piston 20
and the screw 12a on the inner surface of the small diameter portion 12 are engaged with each other. This allows the foam 5 to be removed from the two-stage syringe 10.
0 pure liquid can be taken out. In this case, the amount of liquid to be taken out can be measured while looking at the measuring scale 30 provided on the outer surface of the small (9) (10) diameter portion 12 of the cylinder 16. Also, another liquid can be metered and removed from another two-stage syringe, and thus a plurality of liquids metered in space can be mixed and used.

A two-stage syringe 10 according to a second embodiment of the present invention shown in FIG.
As in the first embodiment, the cylinder 16 includes a cylinder 16 having a small diameter portion 12 and a large diameter portion 14, a large piston 18, and a small piston 20. A nozzle 22 is provided at the tip of the small diameter portion 12, and a cap 24 is attached to cover the nozzle 22.

In the second embodiment, the hole 2 in the center of the large piston 18 is
6 is formed with a taper that decreases toward the nozzle 22, and the outer circumference of the small piston 20 is also formed with a corresponding taper, in the area of the hole 26 where the large piston 18 and the small piston 20 engage at least. It is elastically deformable. When the small piston 20 is pushed in, the small piston 20 engages with the hole 26 of the large piston 18 and both move together, causing the liquid filled in the cylinder 16 to be discharged from the nozzle 22 at the tip of the small diameter portion 12. .

In this case, bubbles are discharged from the nozzle 22 as in the first embodiment.

Then, when the large piston 18 reaches between the small diameter part 12 and the large diameter part 14, the large diameter part 14 comes into contact with the same step part, and when the small piston 20 is pushed further, the small piston 20 is separated from the large piston 18, Only the small piston 20 is in cylinder 1
6 along the inner surface of the small diameter portion 12.

Thereby, the liquid without bubbles can be measured and taken out from the two-stage syringe 10.

〔Effect of the invention〕

As explained above, the two-stage syringe of the present invention includes a cylinder having a small diameter part having a nozzle and a large diameter part continuous to the small diameter part, and a cylinder that is inserted into the cylinder and has an inner surface of the large diameter part of the cylinder. It consists of a large piston that can be fitted into the cylinder, and a small (11) (12) piston that is removably attached to the large piston and that can fit into the inner surface of the small diameter part of the cylinder, and when the small piston is pushed in. The large piston moves along the inner surface of the large diameter portion of the cylinder together with the small piston, and then the small piston is separated from the large piston so that it can move along the inner surface of the small diameter portion of the cylinder. , bubbles can be easily removed even in space.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a two-stage syringe according to a first embodiment of the present invention, FIG. 2 is a diagram showing the two-stage syringe of FIG. 1 in use, and FIG. It is a sectional view showing a two-stage syringe of a second example. 10... 12... 14... 16... 18... 20... 22... ・Two-stage syringe, ・Small diameter part, ・Large diameter part, ・Cylinder, ・Large piston, ・Small piston, ・Nozzle, 24... Cap.

Claims (1)

[Claims] a cylinder (16) having a small diameter part (12) having a nozzle (22) and a large diameter part (14) continuous with the small diameter part;
A large piston (18) that is inserted into the cylinder and can fit on the inner surface of the large diameter portion of the cylinder, and a small piston that is removably attached to the large piston and can fit on the inner surface of the small diameter portion of the cylinder. (20), when the small piston is pushed in, the large piston moves together with the small piston along the inner surface of the large diameter part of the cylinder, and then the small piston is separated from the large piston and the cylinder A two-stage syringe that can be moved along the inner surface of the small diameter part.