JPH07303696A - Prefilled syringe that is easy to store - Google Patents

Abstract

(57) [Summary] [Object] To provide a prefilled syringe capable of saving storage space. [Constitution] When not in use, the inner cylinder itself is miniaturized or exists in such a form as to wrap the outer cylinder, and when used, the prefilled product has an inner cylinder which is in the form of a normal inner cylinder. Syringe.

Description

Detailed Description of the Invention

[0001]

This invention relates to prefilled syringes. More specifically, the present invention relates to a prefilled syringe capable of saving a storage space by downsizing an inner cylinder or integrating it with an outer cylinder.

[0002]

BACKGROUND OF THE INVENTION and Prior Art With the recent widespread use of contrast media, the size of syringes has become conspicuous. However, when storing these, the syringe inner tube must be stored separately from the outer tube, which is the main body.
Since it has almost the same volume as the outer cylinder, storage space for two syringes is required. Japanese Unexamined Patent Publication No. 61-115600 discloses an injection cylinder that can be made compact by collecting a sample such as blood by making the shaft of the inner cylinder bendable or storable. This technique mainly shows good results for suction operations such as blood collection, but for injection operations, the rubber part at the tip of the inner cylinder that comes into contact with the content liquid is unstable, and the content is pressed uniformly. Is difficult.

Further, JP-A-61-115599 discloses that
An injection cylinder that can be made compact by disclosing the inner cylinder with a structure in which the piston portion and the shaft can be partially separated is disclosed. This is because the piston part is molded,
There are limits to miniaturization, and there is room for improvement.

[0004]

Therefore, the present invention intends to save the storage space and simplify the packaging or the production facility by further downsizing the prefilled syringe before use. Is.

[0005]

In view of the above situation, the inventors of the present invention have repeatedly studied specific means for reducing the volume of a prefilled syringe during storage, and as a result,
The present invention has been completed by finding that the syringe having the following shape achieves the intended purpose.

That is, the prefilled syringe is characterized in that the inner cylinder is covered with the outer cylinder body when not in use, and is used as the inner cylinder by removing the inner cylinder from the outer cylinder body when using. , The inner cylinders are m concentric cylinders 8 and 9 whose radii gradually decrease toward the inside.
・ It consists of (m + 7), and when stored, it has the form that all the other tubes are stored in the outermost tube (m + 7) with the largest radius. By pulling the end of the cylinder 8 on the side in contact with the outside in the b direction on the ab axis, the end on the b side of each cylinder and the end on the a side of the cylinder immediately inside the cylinder are joined. A prefilled syringe having an inner cylinder having a predetermined length and being used as an inner cylinder, wherein a thin portion q of a plate made of one hard material is ab A prefilled syringe having an inner cylinder, characterized in that it has one or more locations extending in the direction and has a mechanism in which s and t are coupled to each other so that a cylinder can be formed.

FIG. 1 shows a development view of the inner cylinder of a prefilled syringe in which the inner cylinder is covered with the outer cylinder.
FIG. 1a is a development view seen from the inside when the inner cylinder is assembled. FIG. 1b is a development view seen from the outside when the inner cylinder is assembled. The protrusion v in the figure is connected to the depression w when combined. The protrusion 3 in the figure is likewise connected to the depression 4. Reference numeral 5 in the drawing denotes a portion that is screwed with a tip end portion of a piston such as rubber that is in direct contact with the content, and reference numeral 6 denotes an end (flange) to which force is applied when the content is injected into the body or the like. Reference numeral 7 in the figure is made of a thin plate-like deformable material, a soft metal, a plastic excellent in spreadability, or the like. In this portion, the material of the bending parts 1 and 2 is made sufficiently cylindrical to compensate for the insufficient bending of the material itself. As a matter of course, the circumference of the inner cylinder of the syringe is shorter than the circumference of the outer cylinder, so after covering the outer cylinder, fix it with shrink film, or fix it with a film ribbon etc. in a blister package or bag. It can be provided to the consumer by putting it in such as. In the present application, the hard material is usually
It refers to the types of plastics used in this field, such as glass. In the present drawing, the part made of a hard material composed of two parts is connected by a thin plate-like malleable material, but in some cases, three or more parts may be connected by a malleable material. However, when the hard material itself is sufficiently rich in malleability, one plate may be formed into a cylindrical shape without providing a portion connected by the malleable material. That is, the number n of parts made of hard material is appropriately selected.

FIG. 2 shows an inner cylinder having a contraction mechanism. FIG. 2A shows that the contracted inner cylinder is attached to the outer cylinder. FIG. 2B shows the inner cylinder when contracted. The inner cylinder is composed of several cylinders having concentric bottom surfaces, and when the cylinder 8 is pulled, the cylinders after the cylinder 9 extend according to their respective guides. Various types of guides can be considered, but in short, any form can be used as long as the guides can be supported so as to move only in the vertical axis direction of the bottom surface without the cylinders rotating with each other. As an example of the guide, there is a recess on the inner surface of the cylinder, and there is a protrusion on the outer surface of the cylinder immediately inside thereof, and when the cylinder is extended, this protrusion slides on the recess on the inner surface of the cylinder, so that the cylinders are mutually A mechanism that moves only in the direction of the vertical axis of the bottom surface without rotation is shown in FIG. 2c. Further, since it is difficult to use the tubes when they are pulled out when they are pulled, it is preferable to provide a mechanism for preventing the tubes from coming off between the tubes so that the tubes do not come out. Further, even when the tube 8 is pulled outward to secure a predetermined length, even when pressure is applied to the outer end of the inner tube to push out the contents held in the syringe, the state of storage is maintained. It is preferable to have a mechanism that acts as a stopper that does not return to. As an example, as shown in FIG. 2d, the b side of the outer cylinder is slightly inward or is provided with a wall on the inner side, and the end portion on the a side of the cylinder just inside the cylinder is located. It is possible to cite a mechanism or the like that prevents the cylinders from coming off by being bent inward or by providing a wall inside. These mechanisms do not require that the tubes be pulled out of each other, so that either end need not have an inner wall as in FIG. 2e, but either end may simply have one or more protrusions. As a stopper that prevents the inner cylinder from returning to the stored state when the inner cylinder is pushed to push out the contents, a mechanism shown in the sectional view of FIG. 2c can be given as an example. . That is, there is a protrusion on the a side of the outer surface of the inner cylinder, and a concave portion extends in the a-b axial direction on the inner surface immediately outside of the cylinder as a route for sliding the protrusion. It has an L shape. When the inner cylinder that has been stretched out is twisted lightly by holding 8 in the figure, the protrusions on each cylinder are guided to the L-shaped bent portion according to the path of the recesses in contact with each other and push out the contents. Therefore, even if the inner cylinder is pressed, it does not return to the stored state. In particular, it is preferable to keep the portion that is bent in an L-shape as indicated by h in the drawing narrow so that when the inner cylinder is pressed, even if the cylinder is about to rotate, it is difficult to turn back. The material of each cylinder is not particularly limited, but the above-mentioned hard material or the like can be used.

FIG. 3 shows that one plate-shaped inner cylinder is assembled at the time of use. FIG. 3a shows a cross section when assembled. 3b and 3c are views of the inner cylinder viewed from the direction b. Further, q in FIG. 3b is a portion in which the thickness of this portion of the single plate constituting the inner cylinder is thinned in a band shape in the ab axis direction, and the single plate is bent by this portion. It will be easier. This q may be in one place,
It may be provided in several places. In FIG. 3, the inner cylinder is preferably made of a malleable and hard material, as its structure shows. Most preferably, it is plastic. The ends x and y and s and t shown in FIGS. 1 and 3 may be connected in any manner to form a cylinder, but as shown in FIG. 3d, at the thickness of the plate and at one end Is a protrusion,
There is a hole at the other end for receiving this projection, and by connecting this projection and the hole, it may be formed into a tubular shape, or as shown in FIG. 3b, one end becomes a key shape and the other end becomes a key shape. As an example, a method of connecting in such a manner as to receive this can be given. Note that FIG. 3c shows s and t of FIG. 3b.
The inner cylinder is completed by engaging with each other.

[0010]

As described above in detail, according to the present invention, the volume of the prefilled syringe at the time of storage is about one half of the conventional volume.
It is possible to obtain a prefilled syringe that saves the storage space. The present invention can be applied to pre-filled syringes of all sizes, but in some cases, even in the case of an empty syringe containing no contents, when the shape like the present invention is used, the inner cylinder is inside. There is an advantage that it can be obtained by sufficiently sterilizing the inside of the outer cylinder.

[0011]

[Brief description of drawings]

FIG. 1 is a development view of an inner cylinder in a prefilled syringe having a shape in which an inner cylinder is covered with an outer cylinder.

FIG. 2 shows a developed view of an inner cylinder whose bottom surface is concentric.

FIG. 3 is a development view of an inner cylinder used by assembling a single plate component into a cylindrical shape.

Claims (8)

[Claims] 1. A prefilled syringe, which has a shape in which an inner cylinder is covered with an outer cylinder body when not in use, and is used as an inner cylinder by removing the inner cylinder from the outer cylinder body when using. 2. The inner cylinder is composed of two or more parts n and 1 or 2 or parts n made of a hard material and the deformable parts 7-1 to 7-n between them. When stored, the outer cylinder wraps around, and when used, it is removed from the outer cylinder and the end x of the part 1 and the end y of the part 2 or the part n are connected to form a cylindrical inner cylinder. The prefilled syringe according to claim 1, wherein: 3. The inner cylinders are m concentric cylinders 8, 9, ... (M + 7) whose radii gradually decrease toward the inside.
It has a form in which all the other tubes are stored in the outermost tube (m + 7) with the largest radius when stored, and when used, the outside of the innermost tube 8 By pulling the end on the side abutting against the b-direction on the a-b axis, the end on the b side of each cylinder and the end on the a side of the cylinder immediately inside the cylinder are joined, and A prefilled syringe having an inner cylinder having a length equal to that of the inner cylinder. 4. The prefilled syringe according to claim 3, wherein among the m tubes forming the inner tube, the tubes have such a shape that they can only move up and down without rotating when used. 5. The prefilled product according to claim 3, wherein the inner wall of the outer cylinder and the outer wall immediately inside thereof have concavities and convexities that can be joined to each other, and these concavities and convexities extend in the ab direction of the respective cylinders. Syringe. 6. The prefilled syringe according to claim 3, wherein a projection is provided on an end portion p of the wall surface of the cylinder having the recess that contacts the outside of the recess. 7. A thin plate q made of one hard material has one or two or more parts extending in the ab direction, and s and t are set so that a cylinder can be formed. A prefilled syringe having an inner cylinder characterized by having a mechanism for coupling with each other. 8. In x or y and s or t,
Either one of them enters the inside of the other, and the sides of x and y and s and t that contact each other are keyed at one end and concave at the other so that they are caught by each other. The prefilled syringe according to claim 7, wherein the prefilled syringe has a projection and the other end supports the projection, whereby the cylindrical shape can be held without separating st and xy.