RU184811U1 - Self-destructing syringe with retractable needle, eliminating the possibility of repeated use - Google Patents

Abstract

A self-destructible syringe with a retractable needle, eliminating the possibility of reuse, comprising a housing with a distal end and a proximal end, a piston passing through the proximal end, a rubber seal with two o-rings, a needle holder and a needle mounted inside the tip of the body. The needle holder has a proximal and distal ends, a bolt mounted on the proximal end of the needle holder, triggered by passing through it an anchor located on the distal end of the piston, for subsequent retraction of the needle holder with the needle into the syringe body. The piston has a narrowing section, which allows it to break after using the syringe. To exclude the possibility of triggering the needle holder constipation during transportation, a restriction plate is provided on the piston.

Description

Self-destructing syringe with a retractable needle, eliminating the possibility of repeated use.

The invention relates to a device for parenteral administration through a needle of medicinal compositions, which provides for the retraction of the needle into the body after the injection.

Intramuscular injection is one of the most common ways to administer small volumes of drugs. Muscles have an extensive network of blood and lymph vessels, which creates good conditions for the absorption of drugs. An intramuscular injection creates a depot from which the drug is gradually absorbed into the bloodstream, which helps maintain approximately the same concentration of the active substance in the blood for several hours and thereby ensure its long-term effect.

It should be noted that parenteral administration of pharmaceutically active compounds is preferable in comparison with oral administration for many indications, for example, in cases where the drug is partially or completely decomposed in the gastrointestinal tract or when a quick biological effect is required.

The reuse of disposable syringe devices for parenteral injection can lead to the spread of infectious diseases and drug abuse. A syringe that can be rendered inoperable after use is an effective solution to these problems.

There are different designs of the device that prevents the reuse of syringes, however, some of them retain the general danger of reusing the used needle. To overcome these disadvantages, it is necessary to exclude direct contact of the needle with the environment after the injection.

Known self-destructive insulin syringe (RF patent No. 2531142, published 10/20/2014), containing a housing with a distal end and a proximal end, a piston passing through the proximal end, a rubber seal with two o-rings, a needle holder and a needle installed inside the tip of the case, the needle holder has a proximal and distal ends, a constipation mounted on the proximal end of the needle holder, triggered by the passage of a conical boss located at the distal end of the piston, for subsequent retracting the needle holder with the needle into the syringe body. The piston has a narrowing section, which allows it to break after using the syringe.

A disadvantage of the known syringe is the likelihood of premature activation of the mechanism of self-destruction, for example, during transportation.

Also known is the syringe of China Patent No. 203829420, published September 17, 2014. In the syringe according to the aforementioned patent, fastening is carried out by means of two jumpers connecting only one face of the limit plate with the stiffener of the piston. A disadvantage of the known solution is the risk of accidentally removing the plate during transportation or when creating pressure on the piston stop at an angle.

The closest analogue is described in US patent No. 2004236283, in which the restrictive plate is embedded in the stiffener of the piston and has three attachment points.

However, the design of a limit plate fastener proposed according to the aforementioned patent entails difficulties in manufacturing and quality control of the final product, as well as when the plate is removed, an additional narrowing of the piston shaft is formed, which can lead to premature fracture of the piston shaft during the collection of injection solution and / or during injections.

The technical problem solved by the claimed utility model is to prevent premature or accidental operation of the mechanism of destruction of the syringe, for example, the actuation of the locking device, as well as premature fracture of the piston of the syringe when typing the drug for injection into the syringe and / or during the injection.

The technical result of the utility model is the elimination of premature operation of the mechanism of self-destruction of the syringe by restricting the movement of the piston towards the distal end of the syringe barrel, as well as the narrowing of the piston at such a distance from the distal end of the piston that, when the syringe is finally rendered unusable, the fracture of the piston is at the level proximal end of the body.

The claimed technical result is ensured by the design of a self-destructive syringe with a retractable needle, eliminating the possibility of re-use, containing a housing with a distal end and a proximal end, a piston passing through the proximal end, a rubber seal with two o-rings, a needle holder and a needle mounted inside the tip of the body. The needle holder has a proximal and distal ends, a bolt mounted on the proximal end of the needle holder, triggered by the passage of an anchor located on the distal end of the piston, for subsequent retraction of the needle holder with the needle inside the syringe body, on the piston there is a narrowing section located from the restrictive ring of the piston on a distance equal to the distance from the proximal end of the housing to the restrictive ring on the inner surface of the housing, while the restriction plate is fixed to the piston Ting two perpendicular faces by means of webs on the shaft and in abutment piston.

The restriction plate has three attachment points on perpendicular faces by means of jumpers: two on the piston shaft and one on the piston stop, which ensures reliable fixation of the plate between the piston stop and the stop on the syringe body. Before direct injection, the jumpers are broken and the plate is removed from the piston. The attachment point on the piston stop creates a third fixation point and prevents accidental removal of the plate during transport and when pressure is applied to the piston stop at an angle. When removing the plate, the diameter of the cross section of the piston shaft at the place of attachment of the plate does not change. At the same time, the narrowing section on the piston is located from the restriction ring of the piston at a distance equal to the distance from the proximal end of the housing to the restrictive ring on the inner surface of the housing, which ensures a break in the piston after retracting the needle and fixing the piston relative to the housing when the restrictive rings on the piston shaft coincide with the inner surface of the body, while the fracture will be at the level of the proximal end of the body.

Next, the solution is illustrated by reference to the figures, which show the following.

FIG. 1 is an isometric view of a self-destructive syringe.

FIG. 2 is a side view of a self-destructive syringe in the initial position.

FIG. 3 is a side view in longitudinal section along line 3-3 of FIG. 2.

FIG. 3A is an enlarged longitudinal sectional view of a portion circled 3A in FIG. 3

FIG. 4 is a second isometric view of the device from an angle other than FIG. one.

FIG. 5 is a side view of the device at the stage of the injection solution set.

FIG. 6 is a longitudinal sectional side view along line 6-6 of FIG. 5.

FIG. 7 is a side view of the device in the pushing stage.

FIG. 8 is a side view in longitudinal section along line 8-8 in FIG. 7.

FIG. 8A is an enlarged longitudinal sectional view of a portion circled 8A in FIG. 8.

FIG. 9 is a side view of the device with the needle in a safe retracted position and a broken piston after use.

FIG. 10 is a longitudinal sectional side view along line 10-10 of FIG. 9.

FIG. 11 - self-destructing syringe disassembled.

In FIG. 1-4, the device is shown in the initial position, i.e. with a restriction plate 5 mounted on the piston 2, enclosed between the finger rest 14 and the piston stop 13 and fixed on the piston shaft and on the piston stop by jumpers. The needle holder 3 is held by two restrictive rings 10 located on the inner surface of the tip 15 of the housing and the restrictive ring of the needle holder 9.

In FIG. 5 and 6, the injection drug is located in the inner cavity of the syringe body 16 until pressure is exerted on the piston 2, advancing the rubber seal 6 to the distal end of the syringe body 1. The rubber seal 6 has two o-rings, thereby forming an airtight seal, the ejecting fluid from the inner cavity of the syringe body 16 through the needle 4. During the collection of the drug, the stroke of the piston 2 is limited by the restrictive rings of the piston 11 and the restrictor 12 located on the inner surface STI syringe body 1.

In FIG. 8-8A, after injection, the piston 2 is pushed further into the body of the syringe 1, which leads to the locking of the armature of the piston 7 by locking the needle holder 8. Due to this, when the piston 2 is pulled, the needle holder 3 moves further with the needle 4 into the internal cavity of the syringe body 16.

Finally, as shown in FIG. 9 and 10, after the piston 2 is pulled to the limiter 12, the piston 2 breaks at the narrowing point of the piston 17 located at a distance equal to the distance from the proximal end of the housing to the restrictive ring on the inner surface of the housing.

The syringe also contains a protective cap for the needle, mounted on the distal end of the body.

Claims (2)

1. Self-destructible syringe with a retractable needle, eliminating the possibility of reuse, comprising a housing with a distal end and a proximal end, a piston passing through the proximal end, a rubber seal with two o-rings, a needle holder and a needle installed inside the tip of the body, the needle holder has a proximal and distal ends, constipation mounted on the proximal end of the needle holder, triggered when an anchor located on the distal end of the piston passes through it, for the retracting retraction of the needle holder with the needle inside the syringe body, while the needle holder has a restrictive ring that engages with the ring on the inner surface of the tip of the body, and the restriction plate is fixed to the piston by means of jumpers on the shaft and piston stop, while the piston has a narrowing section located from the restrictive ring of the piston at a distance equal to the distance from the proximal end of the housing to the restrictive ring on the inner surface of the housing. 2. A self-destructive syringe with a retractable needle, eliminating the possibility of re-use according to claim 1, characterized in that it contains a protective cap for the needle, mounted on the distal end of the housing.

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