SU1118369A1 - Automatic injector - Google Patents

Abstract

AUTOMATIC INJECT, content housing, stem, spring, locking element, including a collet with elastic tabs and a trigger mechanism, which is due to the fact that, in order to increase ease of use by reducing the force for unlocking, the housing is filled in the shape of a glass with a hole in the bottom, the rod being installed in the hole with the tenderness of movement, and the spring is arranged so that it interacts with one of its ends with the body and the other with the rod, while the collet is mounted on the body with an axial clearance.

Description

The invention relates to medical technology, namely to intramuscular injection devices.

Known automatic injector, comprising a housing, a rod, a spring, 5 blocking element and the trigger mechanism m.

A disadvantage of this device is a large unlocking force.

Also known is an automatic injector 10 torus comprising a body, a stem, a spring, a locking element including a collet with elastic tabs and a trigger mechanism G.

The disadvantage of this device is a great effort to unlock,

The purpose of the invention is to reduce the force for unlocking.

This goal is achieved by the fact that an automatic injector containing a housing, a rod, a rod, a blocking element, including a collet with elastic tabs and a trigger mechanism, the body is made in the form of a glass with a hole in the bottom, with the stem 25 installed in the hole with possibility of movement, and the spring is placed so that it interacts with one of its ends with the body, and the other with. with a rod, with the collet mounted on the housing with an axial clearance.

FIG. 1 shows an automatic injector, a longitudinal section; in fig. 2 - injector; in position on the fuse, in fig. 3 is the same, j is removed from the fuse in FIG. 4 shows an injector after actuation, a longitudinal section; FIG. 5 - automatic injector, general view

The automatic injector contains about the body 1 in the form of a glass with holes 2, cutting 3 and with a protrusion 4. A collet 6 with elastic tongues 7 having shoulders 8.45 is mounted on the body 1 with an axial clearance 5

The housing 1 encompasses the sleeve 3, having a triggering protrusion 10 at the inner end. In this case, at the open end of the sleeve 9, a figure cutout 11 is made, interacting with the protrusion 4 50 at the body. The cut-out 11 and the protrusion 4 are a safety device that prevents the trigger from being involuntarily activated.

Inside the housing 1 is placed a rod 12 55 with a supporting 13 and locking 14 flanges at the ends and a working spring 15. One of the supporting turns of the spring 15 rests on the bottom of the housing 1 and is attached to it, while the counter-turn of the spring 14 rests 12 and attached to this shoulder.

In the cocked state, the sleeve 9 is set to On position (FIG. 2). The operating spring 15 is compressed, and the locking collar 14 of the rod 12 is held by the shoulders 8 of the elastic tongues 7.

When the automatic injector actuates the sleeve 9, it rotates relative to the housing 1 around an axis, displacing the notch 11 along the protrusion 4 to the position of Sn t with the safety device (Fig. 3). Then, by pressing on the sleeve 9, the triggering protrusion 10 is brought into engagement with the bevels of the elastic tabs 7 of the collet 6, pushing them towards the inner wall of the sleeve 9. At the same time, the shoulders 8 of the tabs 7 release the locking collar 14, and the rod 12 moves the working stroke under the action of the operating spring 15 by providing injection.

To prepare the automatic injector for the next injection, you need to unscrew the used capsule from the housing 1 along the threaded thread 3, move it around the housing 1 and turn the sleeve. 9 in position On fuse. . In this case, the triggering protrusion 10 emerges from the latch with tabs 7, which, under the action of their own elastic forces, return to their original position. Then, the free end of the stem 12 with the support shoulder 13 is supported against a hard surface, the working spring 15 is compressed. The compression of the spring 15 is performed until the shoulder 14 of the stem 12, having passed through the hole 2 in the bottom of the body 1, engages with the shoulders 8 clamps 7. The presence of an axial gap 5 between the bottom of the housing 1 and the shoulders 8 ensures the free state of the tabs 7, which, after passing through the fixture of the shoulder 14 through them, slam under the action of their own elastic forces with characteristic clicks.

The connection to the threaded end 3 of the housing 1 of the capsule ensures that the injector is ready for re-injection.

Due to the axial clearance between the end of the shoulder and the end

There is no need for a little effort. This effort should be sufficient only. To overcome the frictional forces between the shoulders of the tabs and the locking shoulder of the stem, as well as

the magnitude of the force of elasticity of the tabs is very small, since it must ensure only their return to the initial position after passing through the locking collar of the rod.

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Claims (1)

Automatic injector comprising a housing, a rod, a spring, the locking member including a collet with resilient tongues and a trigger mechanism nism ^1, l and m of h and w and d w i with the fact that, in order to improve convenience by reducing the effort unlocking, the case is made in the form of a glass with a hole in the bottom, and the rod is installed in the hole with the possibility of movement, and the spring is placed so that it interacts with one of its ends with the body and the other with the rod, while the collet is mounted on the body with axial clearance . SU., 1118369 1 1118369 2