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1. (WO1995034335) DISPOSITIF POUR SERINGUE HYPODERMIQUE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

TITLE OF INVENTION: . . . „ ,
Arrangement in a Hypodermic Syringe,

TECHNICAL FIELD

The present invention relates primarily to a method that — when a hypodermic syringe (preferably a reusable hypodermic syringe) is used with
° a container;
° a plunger arranged within the interior of said container; ° a backwards-and-forwards-movable rod that is inserted into said container, being able to co-act with said plunger;
° a hypodermic needle that extends away from said container and that is oriented as a longitudinal prolongation of said container;
° an external container that is used to partially enclose said container
— can be used to create the conditions necessary for safely-bending a hypodermic needle, thereby rendering it and/or an entire hypodermic syringe unusable for injection a second time.

Intended for these purposes, the present invention presents a specific arrangement for use with a hypodermic syringe.

The present invention comprises secondarily such an
arrangement.

Although the present invention is primarily intended to provide a complete arrangement so that a hypodermic needle can be safely bent after it has been used, thereby rendering it and/or a hypodermic syringe unusable for injection a second time, a potential exists, within the scope of the invention, for the embodiment — when a previously known, standardised, reusable, hypodermic syringe is allowed to co-act, before the injection, with an external container, which is dimensioned so as to form an arrangement according to the present invention — for using the method described by the invention.

DESCRIPTION OF THE BACKGROUND ART

Hypodermic syringes of various kinds are known to have existed before. Those that are most closely related to the present invention are mentioned below.

The American patent publication 4,425,120 made known a
hypodermic syringe with a container; a plunger arranged within the interior of the container; a backwards-and-forwards-movable rod that is inserted into the container, being able to co-act with the plunger; a hypodermic needle that extends away from the container and that is oriented as a longitudinal
prolongation of said container; and an external container that partially encloses said container, which is arranged so that it can be rotated relative to the container of the hypodermic syringe, and where the external container can take a first and a second position by means of a bayonet mount, where a rotation of the external container brings it into a firm but readily detachable coaction with the container of the hypodermic syringe. The hypodermic needle is protected in the first position, but is exposed in the second position.

Another hypodermic syringe, made known through the American patent publication 2,571,653, is of the kind previously
described, having an external container arranged to enclose the container of the hypodermic syringe. Here, as well, the
external container is arranged to provide two positions: one that protects and one that exposes the hypodermic needle.

As relates to the characteristics of the invention — namely, its being able to safely bend a hypodermic needle after it has been used, thereby rendering the hypodermic needle and/or the hypodermic syringe unusable for a second injection — various arrangements, intended for these purposes, are known to exist.

As examples of prior art regarding these characteristics, references are made to the content of the American patent publications 4,266,544; 4,634,428; 4,728,320; and 4,735,618.

An arrangement described in the American patent publication 4,725,267 also belongs to prior art.

This arrangement, made known through the patent publications US-A-5,259,841 and FR-A-2, 654,346, uses a cover to protect the hypodermic needle. The cover is arranged to enclose the
container of the hypodermic syringe. In this arrangement, the hypodermic needle is positioned off-centre from the centre line of the container.

SUMMARY OF THE INVENTION: TECHNICAL PROBLEMS

In view of prior art, as described above, one technical problem is to show, in a simple way, a method that — when a hypodermic syringe (preferably a standardised, reusable, hypodermic syringe) is used with the aid of an external container that partially encloses the container of the hypodermic syringe — makes it possible to create the conditions necessary for safely bending a hypodermic needle, thereby rendering it and/or an entire hypodermic syringe unusable for a second injection.

Another technical problem is to discern the importance of this method; that is, that it can be performed only if the
hypodermic syringe and the container are allowed to be
essential parts of a specific arrangement that meets
predetermined conditions, in order to fulfil the desire to safely be able to bend the hypodermic needle.

Another technical problem is to be able to create an
arrangement that uses a standardised, reusable, hypodermic syringe that can easily be connected to the significant
arrangement of the invention when the hypodermic syringe is of a specific construction, and where the external container requires a simple adaptation to said construction.

Another technical problem is to be able to show an arrangement related to the hypodermic syringe that can be handled in a known way by hospital personnel or others, where the hypodermic needle can be safely bent by means of a very simple
manipulation, and where the bent hypodermic needle will be completely encased within the space that is formed between the outer part of the container, which holds the hypodermic needle, and the end partition of the external container, which is adjacent to the hypodermic needle.

Another technical problem is to discern the importance of orienting the external container as a longitudinal
prolongation, so that, through an acceptable coaction with the container, it can be dislocated over the hypodermic needle, thereby totally covering the hypodermic needle.

Another technical problem is to discern the conditions
necessary for, and the necessity of, adapting the outer surface of the container to the inner surface of the external
container, so that these can be given not only an axial
dislocation, but also a rotational movement, relative to each other, without — for these purposes — having to complicate the connecting arrangements.

Another technical problem is to discern the importance of making the end partition of the external container hard enough to be able to bend the hypodermic needle without allowing the tip of the needle to penetrate the end partition.

Another technical problem is to be able to show a means for securing the external container to the container in a fixed but readily detachable manner.

Moreover, it is a technical problem to discern the importance of letting said means consist of dot-formed meltdowns in the opposing surface layers of the container and the external container.

Another technical problem is to discern the importance of letting said means consist of an irregularity, such as a ridge positioned in a radial or axial manner along the inner surface of the external container.

In addition, another technical problem is to discern the importance of arranging said irregularity so that it is active in a relative position between the external container and the container that corresponds to the hypodermic needle when sufficiently bent.

Finally, another technical problem is to discern how important it is for the external container to have an inner form that is directly adapted to be able to enclose a standardised,
reusable, hypodermic syringe, in order to make it unusable for injection.

SOLUTION

In order to solve one or more of the above-mentioned technical problems, the present invention currently shows a method that — when a hypodermic syringe is used with a container; a plunger arranged within the interior of said container; a rod that is inserted into said container in a backwards-and-forwards movable manner, being able to co-act with said plunger; a hypodermic needle that extends away from said container and that is oriented as a longitudinal prolongation of said container; and an external container that partially encloses said container — can be used to create the conditions necessary for safely bending a hypodermic needle, thereby rendering it and/or a hypodermic syringe unusable for a second injection.

The significant method of the invention requires both a specific arrangement and a specific action.

The arrangement requires that said hypodermic needle be
oriented in a known way, off-centre from the centre line of the container, that said external container is formed with a hole at the end partition positioned closest to the hypodermic needle, and that said external container is arranged so as to enclose said container so that the hypodermic needle is
positioned outside the end partition of said external
container.

With an arrangement of this kind, the present invention shows that if, after an injection has been made, it is desirable to safely bend the hypodermic needle in order to render a
hypodermic syringe unusable, the external container must be dislocated in a direction so as to totally cover the used hypodermic needle; in this position, the external container is rotated relative to the container so that the tip of the hypodermic needle is oriented at the side of the hole in said end partition, and the external container is pressed towards the container with force enough to bend the hypodermic needle within the external container while the external container is pushed in the opposite direction, thereby covering the
container during the bending process.

As a proposed embodiment, falling within the scope of the invention, it is shown that said external container is to be able to be firmly related to the container, and that said firm relationship can be broken or released immediately before said dislocation is made in a direction so as to completely cover the used hypodermic syringe.

Moreover, it is shown that during the method of safely bending the hypodermic needle, the external container is to be rotated relative to the container.

The present invention also shows how an arrangement with a reusable hypodermic syringe can be used with a container; a plunger arranged within the interior of the container; a backwards-and-forwards-moveable rod that is inserted into said container, being able to co-act with said plunger; a hypodermic needle that extends away from said container and that is oriented as a longitudinal prolongation of said container; and an external container that partially encloses said container.

The orientation of said hypodermic needle must be off-centre from the centre line of the container whose external container, which is formed with a hole at its end partition positioned closest to the hypodermic needle, is arranged to enclose said container when positioned so that the hypodermic needle is surrounded by said hole, positioning the hypodermic needle mainly outside said end partition.

The external container is given, in known manner, a
longitudinal prolongation, so that it can be dislocated with an acceptable coaction with the container over the hypodermic needle, thereby completely covering the hypodermic needle.

Further, the outer surface of the container is to be adapted to the inner surface of the external container so that these can share a related movement of rotation.

The invention shows that the end partition of said external container is hard enough to bend the hypodermic needle without allowing the tip of the needle to penetrate the end partition.

As a proposed embodiment, it is specifically shown that the external container is related to the container through a fixed but readily detachable securing or fastening means.

Said means can consist of a dot-formed meltdown in the opposing surfaces of the container and the external container.

It is further shown that said means can consist of an irregularity formed in the inner surface of the external container.

Said irregularity is to be arranged to be active in a relative position between the external container and the container associated with a hypodermic needle that has been sufficiently bent.

Finally, it is shown that said external container is to be given an inner form that is directly adaptable for enclosing a standardised, reusable, hypodermic syringe.

ADVANTAGES

The advantage that primarily can be regarded as characteristic for a method and arrangement according to the present invention is that conditions have been created for rendering, in a simple way — if necessary — a reusable hypodermic syringe unusable solely by ensuring that it has a specific form; that is, that the hypodermic needle is positioned off-centre from the centre line of a container whose external container, which has a hole at the end partition closest to the hypodermic needle,
partially encloses said container, so that the hypodermic needle is positioned on the outside of said end partition, and that by means of a specific dislocating movement of the
external container, relative to the internal container, the hypodermic needle can be safely bent within the external container, rendering the hypodermic needle and/or the
hypodermic syringe unusable.

The primary characteristic features of a method, according to the present invention, are set forth in the characterising clause of Claim 1; the primary characteristic features of an arrangement, according to the present invention, are set forth in the characterising clause of Claim 5.

BRIEF DESCRIPTION OF THE DRAWINGS

A unique arrangement according to the invention, adaptable for use in the method that has been described, will now be
described in greater detail while referring to the accompanying drawings, in which:

Figure 1 illustrates, partly in cross-section, the
arrangement in a position where the hypodermic
syringe is reusable;

Figure 2 illustrates the arrangement in a position where the
external container has been dislocated so as to
totally cover the hypodermic needle that belongs to
the hypodermic syringe;

Figure 3 illustrates a position where the external container
has been rotated 180* relative to the hypodermic
syringe;

Figure 4 illustrates a position where the external container, has been pressed over the container of the hypodermic syringe with a rotating movement, while the
hypodermic needle has been bent safely within the
external container;

Figure 5 illustrates a first embodiment of the securing means that hold the external container to the container of the hypodermic syringe;

Figure 6 illustrates a second embodiment of said securing
means;

Figure 7 illustrates, in perspective, an external container
whose securing means are formed of axial ridges;

Figure 8 illustrates, in perspective, an external container
whose securing means are formed of radial ridges.

DESCRIPTION OF EMBODIMENTS AT PRESENT PREFERRED

With reference to Figure 1, an arrangement 1 is shown to consist of a standardised reusable hypodermic syringe 2 and an external container 3 in the form of two separate units that co-act with one another.

The hypodermic syringe presents, in a known way, a container 2a, a plunger 2b arranged within the interior of said
container, and a rod 2c that is able to co-act with the
plunger.

The backwards-and-forwards-moveable rod 2c is inserted in a known way into the container 2a, first, with an aim to fill the container, with a movement from a hypodermic needle 4, with a liquid that is meant to be injected; and second, with a
movement in the opposite direction, in order to be able to press said liquid through the hypodermic needle.

The hypodermic needle 4 is arranged to extend away from the container 2a and is oriented as a longitudinal prolongation of the container.

The invention also shows the use of the external container 3, which partially encloses the container 2a, and whose length approximately corresponds to the length of the container 2a. The external container is equipped with a collar 3d that faces away from the hypodermic needle.

The arrangement shown by the invention requires the reusable hypodermic syringe 2 to have its hypodermic needle 4 positioned off-centre from the centre line 2a' of the container 2a, where the distance is "a".

The external container 3 is formed having a hole 5 at the end partition that is adjacent to the hypodermic needle, which hole is also positioned off-centre from the centre line of the container by a distance "a".

The conditions have hereby been created for the external container 3 to be able to mainly enclose the hypodermic syringe 2, and more specifically its container 2a, whereby, in a specific position, the hypodermic needle 4a can be enclosed by said hole 5, placing it mainly on the outside of the end partition 3e of said external container.

Figure 2 illustrates how the external container 3 has been dislocated in a direction so as to completely cover the used hypodermic needle 4 so that its tip 4a is positioned within the external container 3 at a slightly adapted distance from the hole 5.

Figure 3 illustrates the external container 3 rotated 180° relative to the container 2a, so that the tip 4a of the
hypodermic needle is oriented at the side of said hole 5 adjacent to said end partition 3e.

When the external container 3 is dislocated over container 2a, the tip 4a of the hypodermic needle rams into the inner surface 3e' of the external container 3, which, when pressed with sufficient force towards and over the container 2a, bends the hypodermic needle 4 within the external container 3, crossing the direction of the external container, relative to the container 2a, during the bending process.

In Figure 4, the hypodermic needle 4 is shown bent into a spiral, indicated as 4', owing to the dislocation of the external container 3 — from the position shown in Figure 3 — over the container 2a — to the position shown in Figure 4 — that occurred by rotating the external container 3 relative to the container 2a.

Certain dimensioning rules can be regarded as relevant for achieving an arrangement that is functional and easy to control .

One such rule is that the external container 3 is given a longitudinal prolongation so that it can be dislocated to totally cover the hypodermic needle 4, according to Figure 2, while still maintaining an acceptable coaction with the container 2a.

It is shown that in this position at least half of the length of the external container 3 is able to co-act with the lower part of the container 2a.

A second dimensioning rule is that the outer surface 2a' of the container 2a can be adapted to the inner surface 3a' of the external container 3 so that they can be rotated relative to each other. Clearly, cylindrical surfaces with a good match are preferred.

A third dimensioning rule is that the end partition 3e of said external container 3 needs to be hard enough that it can be used to bend the hypodermic needle 4 without allowing the tip 4a of the needle to penetrate it.

This requirement is easily fulfilled by using a plastic
material that is suitable for this purpose.

It is further regarded as suitable that the external container 3 be related to the container 2a through a fixed but readily detachable securing means.

Figure 5 illustrates a securing means that consists of an irregularity 7 in the inner surface 3a' of the external
container 3.

The form of the irregularity, as well as its position, can be selected arbitrarily in order to achieve an adapted movement for a secure hold between the external container 3 and the container 2a.

The irregularity can have the form of warts.

A second variant, according to Figure 6, is to let said
securing means consist of a dot-formed meltdown 8 formed in the opposing surface layers of the container 2a and the external container 3.

This embodiment requires that the meltdown be broken at a dislocation of the external container 3 in relation to the container 2a, according to Figure 2.

In particular, it is shown that said irregularity 7/8 is arranged to be active in a relative position between the external container and the container that corresponds to the sufficiently bent hypodermic needle 4', according to Figure 4, where the position of said securing means is oriented within the distance "d".

It is specifically suitable to give the external container 3 an inner form 3a that is directly adaptable for mainly enclosing a standardised, reusable, hypodermic syringe.

For this purpose, the inner surface 3a' of the external
container 3, illustrated in Figure 7, is equipped with three ridges 10, 11, 12 that are related in a parallelly axial manner. The number of ridges can be increased.

A condition for each ridge is that they need to be dimensioned to give container 2a a slow dislocating movement as it is brought into coaction with the external container 3.

Preferably, the container 2a will have a scale on it, and the external container 3 will be transparent enough to make this scale visible.

The hypodermic needle 4 can be permanently fastened to the container 2a, or it can be exchangeable, meaning that the container 2a can be reused by pulling it out of the external container 3, leaving a bent hypodermic needle 4' in the inner part of the external container 3.

It will be understood that the invention is not restricted to the illustrated exemplifying embodiments thereof, and that modifications can be made within the scope of the inventive thought illustrated in the following claims.