JPH06319801A - Injection cylinder - Google Patents

Abstract

PURPOSE:To provide the injection cylinder which prevents liquid from leakage and smoothly moves an inside cylinder with a little force at the time of use by forming the front end part of the inside cylinder of elastic rings, and a hard material holding this ring and connecting the hard material by means of screws. CONSTITUTION:A part 1 is the part at the foremost end of the inside cylinder of the injection cylinder and has a mushroom shape consisting of a circular part making contact with the inside wall of the outside cylinder of the injection cylinder and a part of a handle extending from the central part. The neck part of the handle has a threaded part meshing with a part 2. The part 2 is a part for holding the rings made of the elastic materials together with the part 1 and has an inclination on the contact surface with the rings. The central part is bored with a doughnut-shaped hole and the handle of the part 1 passes this hole. The parts 1, 2 are connected by the screws. The part 3 is for tightening and loosening the part 1 and the part 2 and the hard material is used for this part like the parts 1, 2. The parts 5, 6 are the rings made of the elastic materials and are used to prevent the infiltration of a liquid wed cine into the spacing between the part 1 and the part 2. A part 6 prevents the deviation of the inside cylinder at the time of infecting the liquid medicine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drug solution filling syringe having excellent usability. More specifically, it relates to an injection cylinder having excellent airtightness during storage of contents and excellent slidability of an inner cylinder during use.

[0002]

2. Description of the Related Art A product sold by enclosing a liquid medicine in a syringe is sterilized while the liquid medicine is filled in the syringe, and therefore liquid leakage often occurs due to pressure change in the syringe after and during sterilization. . Also, when it is distributed as a product, it may simply leak out from the gap between the inner cylinder and the outer cylinder, which serve as the lid. In order to prevent this liquid leakage, many of the products currently on the market have been devised in the inner cylinder of the injection cylinder, but the most common type uses a rubber typified by butyl rubber at the tip of the inner cylinder. However, there are some that have been devised in their shape. For example, the actual development sho 60-49
In No. 846, the inner cylinder is formed of a convex spherical surface or a concave spherical surface that is substantially concentric with the injection hole of the injection needle, thereby increasing the contact pressure of each part and preventing the injection liquid from leaking out.

[0003]

However, if the filling amount of the chemical liquid is small, there is no serious problem, but if the filling amount is large, there is a problem that it is not enough to devise the rubber shape. Furthermore, there is a drawback in that the more the liquid leakage is prevented and the better the sealing performance is, the more force is required to move the inner cylinder during use, and further improvement has been demanded. In view of the above situation, the present inventors have
We have begun research on an injection cylinder that does not leak during sterilization or storage, and the inner cylinder can move smoothly with a slight force during use.

The present inventors consider that it is useful to change the frictional force between the inner wall of the outer barrel and the inner barrel of the syringe barrel during storage and during use in order to achieve the above object. As a result of repeated studies on the above, it was found that the syringe having the following structure achieves the intended purpose, and the present invention was completed.

[0005]

That is, the present invention provides a syringe as shown below. In an injection barrel including an outer barrel and an inner barrel, a distal end portion of the inner barrel is made of an elastic ring and two hard materials sandwiching the elastic ring, and the two hard materials are connected by a screw.

Inserting an elastic ring in the inner cylinder 2
An injection cylinder characterized in that the contact surface of two hard material parts with the elastic ring has a hill-like slope.

By tightening the hard material parts with screws in the inner cylinder, the distance between the hard material parts above and below the elastic ring is shortened, and the elastic ring is deformed so as to be pushed outward. An injection cylinder characterized by increasing the adhesion between the inner wall and the elastic ring, increasing the airtightness of the container to prevent the contents from leaking, and loosening the screw to improve the slidability of the inner cylinder.

In the inner cylinder, the hard material parts are tightened with screws to reduce the distance between the hard material parts above and below the elastic ring, and the elastic ring is deformed so as to expand outward. 2. The injection according to claim 1, wherein the inner wall and the elastic ring are closely attached to each other, the airtightness of the container is increased to prevent leakage of the contents, and the screw is loosened to improve the slidability of the inner cylinder. How to prevent liquid leakage from the cylinder.

The present invention will be described below in detail with reference to the drawings, but the present invention is not limited thereto. FIG. 1 shows a syringe according to the present invention.

[0010]

[Figure 1]

In FIG. 1, parts 1 and 2 form the shaft of the inner cylinder of the injection cylinder according to the present invention, and are both parts made of a hardener.

The component 1 is the most distal part of the inner cylinder of the injection cylinder and has a surface which comes into direct contact with the drug solution. It has a mushroom-like shape consisting of a circular part that comes into contact with the inner wall of the outer cylinder of the syringe barrel, and a handle part extending from the center part of the syringe barrel. At the base of the handle, there is a screw part that engages with the component 2. have. This part has a handle, that is,
The surface on the back side of the surface in contact with the chemical has a gentle slope and has a hill shape.

The component 2 is a component for sandwiching a ring made of an elastic material together with the component 1, and has a gentle hill shape having an inclined contact surface with the ring. The center portion has a donut-shaped hole, and the handle of the component 1 passes through this hole. The tip is threaded so as to engage with the threaded portion of the component 1. That is, the component 1 and the component 2 are connected by the screw.

The component 3 is for tightening or loosening the component 1 and the component 2 by rotating the component 1 in this way. As the material, a hard material can be used like the parts 1 and 2.

The component 4 is a ring made of elastic material. The outer diameter of the normal shape is approximately the same as or slightly smaller than the inner diameter of the outer cylinder of the injection cylinder.

The parts 5 and 6 are rings made of an elastic material having a gentle arcuate portion in contact with the inner surface of the outer cylinder of the injection cylinder. 5 is for preventing the chemical solution from entering between the parts 1 and 2. Reference numeral 6 is for preventing the inner cylinder from shaking and making it difficult to inject the drug solution at a constant speed when the drug cylinder is actually pushed down to inject the drug solution into the living body.

The above parts are combined as shown in FIG.

[0018]

[Fig. 2]

A component 4 is sandwiched between the component 1 and the component 2,
Put part 5 on it. Since the surfaces of parts 1 and 2 facing each other have a gentle slope,
The distance between the component 2 and the component 2 is narrow at the central portion and becomes wider toward the outer side, that is, the direction in contact with the outer barrel of the syringe. The parts 1 and 2 are connected by screws as described above. Insert the handle of the component 1 into the hole opened at the center of the component 3 and turn it to tighten the components 1 and 2. As a result, the elastic ring of the component 4 is compressed and pushed outward. In this state, the drug solution is filled through the injection hole in which the injection needle is set.

When injecting the drug solution into the living body, the parts 3 and 3 are loosened by the parts 3 to restore the parts 4 to the normal shape, and the parts 3 are extruded as they are for injection.

A hard material is preferable as the material for the components 1, 2 and 3, but any material such as plastic or polyethylene can be used as long as it can be used for an ordinary inner cylinder of an injection cylinder.

As the elastic material of the parts 4, 5 and 6, commonly used rubber or the like can be used.

[0023]

By using the syringe according to the present invention,
It is possible to prevent the liquid leakage of a type of syringe that is sold as it is by filling a syringe with a medicinal solution and to inject the medicinal solution into the body smoothly with a slight force at the time of use. Further, since the present invention can be used without being limited by the size of the syringe, it is possible to prevent the leak of a large syringe having an inner diameter of 30 mm or more, which has conventionally been apt to leak a liquid medicine.

[0024]

[Brief description of drawings]

FIG. 1 shows a vertical cross-sectional view of an inner cylinder of an injection cylinder.

FIG. 2 shows a vertical cross-sectional view of the syringe barrel of the present invention during use.

Claims (4)

[Claims] 1. An injection cylinder comprising an outer cylinder and an inner cylinder,
The tip part of the inner cylinder sandwiches the elastic ring and this 2
An injection barrel consisting of two hard materials that are connected by screws. 2. The syringe barrel according to claim 1, wherein in the inner barrel, the contact surfaces of the two hard material parts sandwiching the elastic ring with the elastic ring have a hill-like inclination. 3. In the inner cylinder, by tightening a hard material part with a screw, the distance between the hard material parts above and below the elastic ring is shortened, and the elastic ring is deformed so as to be pushed outward. 2. The slidability of the inner cylinder is improved by increasing the adhesion between the inner wall of the cylinder and the elastic ring, increasing the airtightness of the container to prevent leakage of the contents, and loosening the screw. Syringe. 4. In the inner cylinder, by tightening a hard material part with a screw, the distance between the hard material parts above and below the elastic ring is shortened, and the elastic ring is deformed so as to be pushed outward. 2. The slidability of the inner cylinder is improved by increasing the adhesion between the inner wall of the cylinder and the elastic ring, increasing the airtightness of the container to prevent leakage of the contents, and loosening the screw. To prevent liquid leakage from the syringe.