JPH0568995B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is characterized in that a tubular holder containing a cylindrical ampoule filled with an injection solution holds at one end a needle portion protruding toward the cylindrical ampoule. The present invention relates to a syringe, which has a connecting piece that connects the body, a finger rest at the other end, and a cannula that can be fixed to the connecting piece.

[Conventional technology]

This known syringe has a luer-lock projection on the holder and a luer-lock projection projecting into the inside of the holder. When the syringe is operated, the sealed part (rubber disc) of the filled cylindrical ampoule is pierced and the needle part is inserted into the ampoule and the cannula. It is necessary to make a connection with

Since the needle part is fitted, as is known, only into the cone, the cone has a through hole in which the needle part is received and to which it is fixed by welding or gluing.

However, when the syringe is actuated, and therefore when it pierces the sealed part of the cylindrical ampoule, the resulting force loosens the needle part and forces it forward through the hole, causing a connection with the filled ampoule contents. It has been found that this method of mounting does not provide absolute certainty as it is not possible to do so.

There is also a known syringe in which a needle portion is positioned and housed in a connecting piece for holding the needle portion, and this connecting piece is fitted into a tubular holder (Utility Model Application No. 100433/1983). In this case, since the connecting piece and the holder are separate bodies, separate molds are required for their manufacture. Furthermore, in order to position the needle part within the holding body, it is not only necessary to position the needle part within the connecting piece, but also to position this connecting piece within the holding body. Therefore, for positioning purposes, it is necessary to form engaging protrusions and recesses on the connecting piece and the holding body, which results in a mold having a complicated structure, and the assembly work accordingly becomes complicated. These are major obstacles to mass-produced disposable syringes.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a syringe that has a small number of components, is easy to assemble, and is suitable for mass production.

[Means to solve the problem]

In order to solve this problem, according to the present invention, the connecting piece is formed by a luer-lock protrusion that is integrally formed with the holder, and the luer-lock protrusion has the following features:
The needle portion is positioned and housed in the Luer cone in the ampoule insertion direction.

〔Effect of the invention〕

In this way, according to the present invention, the luer-lock protrusion as a connecting piece is integrated with the holder instead of being separate from it, so the number of component parts of the syringe is reduced, and the number of molds required is accordingly reduced. There is no need to assemble it. Also, the needle part is reeled.
As long as the needle portion is positioned and attached to the luer cone of the lock projection, the needle portion will also be positioned relative to the holder, so there is no need for an engaging projection or recess for this positioning. The structure of the mold also becomes simpler. These are extremely advantageous in mass-produced syringes of this type.

[Embodiment]

A simple and reliable attachment of the needle part is achieved because the hole in the holder is stepped, so that the needle part has an opposing support surface on the stepped part of the hole, and the axis that occurs when piercing a cylindrical ampoule This is achieved by being firmly restrained without loosening or moving in the axial direction even under directional forces.

Restriction of the needle portion is achieved by the needle portion being welded or glued into the hole, or otherwise held in a press fit by corrugations, projections, etc. provided in the hole. Ru.

Due to the stepped hole, the needle part can no longer be assembled from the front; it is inserted into the luer-lock projection through the opening on the rear side of the holder, which is of course easy to carry out.

Cams are integrally formed inside the cylindrical holder, and these cams clamp the cylindrical ampoule. This is because the cam is initially inserted into the holder only to a predetermined depth, so that piercing of the seal only takes place when the syringe is actually actuated.

The finger rest on the rear end of the holder exhibits a square, circular or oblong shape which provides an advantageous contact surface for the user.

〔Example〕

An embodiment according to the invention is shown in the drawing and will be explained in detail below.

The holder 1 of the syringe, particularly for ophthalmologists, is formed by a cylindrical tube, which has at one end a luer-lock projection 2 with a needle part 3 projecting into the inside of the holder 1. , has a finger rest 4 at the other end.

As shown in the embodiment of FIG. 1, a cannula 5 can be removably secured to the luer-lock projection 2 by means of a connecting piece 6. Another type of outflow mechanism, such as a tube, can also be connected to the luer-lock projection 2 by means of a connecting piece 6.

The tubular holder 1 accommodates a filled cylindrical ampoule 7, which is closed at one end by a piston 8 and at the other end by a sealing part 9, in particular a rubber diaphragm.

The sealing part 9 is pierced by the needle part 3 in order to actuate the syringe to connect the contents of the ampoule (liquid drug or product) and the cannula 5.

A cannula protector 10 is removably fitted onto the end of the holder forming the luer-lock projection 2, with a snap-on cap 11 and a threaded projection 13 which engages onto the cannula 5. It is composed of a tubular piston rod 12. This cannula protector 10 is designed so that when the cylindrical ampoule 7 is emptied, the screw protrusion 13 is inserted into the piston 8.
, thereby allowing the piston 8 to be moved within the ampoule 7.

The needle part 3 is designed as a short needle point and, according to the invention, is reduced in cross section towards the cannula 5 and has a Luer cone 15 with an opposite support surface 14 for the needle part 3 in the ampoule insertion direction A. certain hole 1
6 is being restrained. This bore 16 is preferably stepped in cross-section and is reduced to a smaller bore 17 at a distance from the free end face of the cone 15. A diameter corresponding to the outer diameter of the needle part 3 is shown, so that a step is created between the two holes 16, 17, which step forms an opposite support surface 14 onto which one of the needle parts 3 is attached. The ends of the two are in contact. The other end of the needle part 3 is configured to project from the cone 15 into the holding body 1 and become an inclined insertion tip 3a there.

The needle part 3 is additionally provided with a hole 1 by welding or gluing.
It is fixed within 6.

Furthermore, the needle part 3 can be held in the bore 16 by pressing (press fit), in which case the needle part 3
It is advantageous to provide the inside of 6 with corrugated protrusions 16a, protrusions, cams, etc. (see FIG. 2).

As is well known, the lock projection 2 has a female thread 1.
It consists of a pot-shaped sleeve 18 with 9 and a cone 15 centrally arranged therein and supported on the sleeve bottom 20, which cone projects slightly from the sleeve 18.

The needle part 3 projects from the sleeve bottom 20 into the interior space of the holder 1 .

The cannula 5 or tube or other drainage mechanism is fixed to the thread 19 of the sleeve 18 by means of a connecting piece 6, which covers the cone 15 in a leak-tight manner.

Cam-like projections 21 are integrally formed on the inside of the holder 1, and these projections prevent the inserted cylindrical ampoule 7 from moving, i.e. the sealing of the cylindrical ampoule when the syringe is not in use. Part 9 is held spaced apart in front of needle part 3 (see Figure 1). When activating the syringe, the cylindrical ampoule 7 is pushed further into the holder 1 in direction A, so that the needle part 3, which is fixedly seated in the cone 15, pierces the sealing part 9 and thereby releases the ampoule. The contents of the cannula 5 can flow through the needle part 3 into the cannula 5, which takes place during the movement of the piston 8 in direction A.

The holding body 1 with the luer lock projection 2 and the finger rest 4 is preferably manufactured in one piece from plastic, preferably transparent plastic.

The needle part 3, which is fitted into the cone 15, is made of metal.

The cannula protector 10 is also constructed in one piece from plastic.

Preferably, the holder 1 is made of a harder plastic than the cannula protector 10.

The finger rest 4 can have a basic shape of a circle, square or oval and serves as a finger rest when pushing the piston rod 12 into the cylindrical ampoule 7;
In this case, the snap-in pad 11 is the contact surface for the thumb.

The cross-sectional reduction of the hole 16 is preferably carried out by stepping 14. Another possibility of implementing a small cross-section consists in a conical configuration of the bore 16.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the syringe, and FIG. 2 is a longitudinal sectional view of a partial area of the syringe holder into which the needle portion has been inserted. DESCRIPTION OF SYMBOLS 1... Tubular holder, 2... Connection piece (luer-lock protrusion), 3... Needle part, 4... Finger rest, 5...
...canyule, 7...cylindrical ampoule, 15...
Ruel cone.

Claims (1)

[Scope of Claims] 1. A tubular holder 1 containing a cylindrical ampoule 7 filled with an injection solution has a cylindrical ampoule 7 at one end.
The connecting piece 2 has a connecting piece 2 that holds the needle part 3 protruding toward the holder 1, has a finger rest 4 at the other end, and cannula 5 can be fixed to the connecting piece 2, and the connecting piece 2 is integrally attached to the holder 1. The luer-lock protrusion 2 is formed by the luer-lock protrusion 2.
A syringe, characterized in that the needle portion 3 is positioned and housed in the Luer cone 15 in the ampoule insertion direction A. 2. The needle part 3 is constrained in holes 16, 17 which reduce the cross-section stepwise towards the cannula 5 and form an opposite support surface 14 for the needle part 3. A syringe according to scope 1. 3. The syringe according to claim 2, characterized in that the needle portion 3 is fixed in the hole 16 by welding. 4. The syringe according to claim 2, characterized in that the needle portion 3 is fixed in the hole 16 by adhesive. 5. The syringe according to claim 2, characterized in that a corrugated undulation 16a, a protrusion or a cam is integrally formed inside the hole 16 for fixing the needle part 3. 6 In order to secure the inserted cylindrical ampoule 7, inner protrusions 21 are integrally formed in the tubular holder 1, and these protrusions seal the sealing part 9 of the cylindrical ampoule 7 when the syringe is not in use. The needle part 3
characterized by being held at intervals in front of the
A syringe according to claim 1. 7. A protector 10 for the cannula 5, consisting of a holder 1 with a luer-lock projection 2 and a finger rest 4, and a tubular piston rod 12 with a threaded projection 13 and a snap-in cap 11, are each integrally constructed of plastic. 2. Syringe according to claim 1, characterized in that the holder 1 is manufactured from a harder plastic. 8. The syringe according to claim 1 or 7, wherein the finger rest 4 has a basic shape of a circle, square, or oval.