RU182223U1 - AUTOMATIC INJECTOR WITH NEEDLE PROTECTION - Google Patents

Abstract

The utility model relates to medical equipment, medicine and veterinary medicine. More specifically, the utility model provides a device for the sequential automatic injection of a needle and a liquid drug into muscle tissue and can be used in emergency medical care and emergency assistance to people and animals in emergency situations, as well as self-help and mutual assistance to military personnel in the field . The technical result is to prevent the possibility of accidental post-injection wound with a needle. The specified technical result is achieved by the fact that in the inventive automatic injector a post-injection needle protection system is used.

Description

The technical field to which the utility model relates.

The utility model relates to medical equipment, medicine and veterinary medicine. More specifically, the utility model provides a device for the sequential automatic injection of a needle and a liquid drug into muscle tissue and can be used in emergency medical care and emergency assistance to people and animals in emergency situations, as well as self-help and mutual assistance to military personnel in the field , including for the rapid introduction of antidotes in the case of the use of chemical weapons.

State of the art

Currently, there is a growing demand for car injectors. The use of automatic injectors overcomes psychological discomfort due to the fact that the needle is hidden from the user inside the case. In addition, the injection procedure using the autoinjector does not require skills and can be performed with one hand.

At the same time, in accordance with safety requirements, it is necessary that after use the disposable components are in a safe condition in order to reduce the risk of needle injuries.

Various approaches have been proposed to provide post-injection needle protection. For example, in the patent RU 2565388 C2 (publ. 10/20/2015) a needle protection mechanism based on the use of magnets is described. The device described in patent EA 012008 B1 (published on June 30, 2009) becomes safe by retracting the needle after injection. The manufacture of these mechanisms is time consuming and expensive.

Thus, there is a need to develop new tools for this purpose.

Disclosure of the essence of the utility model.

The objective of the claimed utility model is to create a safe device for injection, suitable for use by civilians.

The technical result is to prevent the possibility of accidental post-injection wound with a needle.

The specified technical result is achieved by the fact that in the inventive automatic injector a post-injection needle protection system is used.

As an inventive utility model, an automatic injector is proposed, consisting of a cylindrical body, on one side of which a conical narrowing is made with a hole in the center, behind which inside the case a needle is placed with a needle towards the hole, filled with liquid medicine or prophylactic and sealed with a piston plug, for which is a cylindrical pusher with a compressed spring on it, and on the other hand, a trigger mechanism is installed, while through the rectangle holes, the first pair of which is located diametrically at the neck of the carpool of the car injector in the ready state, and the second at the level of the neck of the carpool of the car injector in the injection state, on the case between the holes, connecting them, non-through rectangular grooves are made to a depth of half the thickness of the case, over the case a needle protection mechanism is located, consisting of a spring of the protective mechanism and a protective cap, which is a cylinder made with the possibility of sliding movement along the body auto-injector, and having, on the one hand, a conical contraction commensurate with the body of the auto-injector with a hole in the center, on the sides of the cap there are elastic clips made with the possibility of bending from the central axis of the auto-injector, as well as with the possibility of engagement with rectangular holes on the housing, on the other hand there is a protective cap a groove of a larger internal diameter for installing a spring of the protective mechanism that pushes the cap out after actuation and removal of the autoinjector.

Brief Description of the Drawings

In FIG. 1 shows a General view in section.

In FIG. 2 is a pusher.

In FIG. 3 is a schematic representation of the action of an autoinjector.

Utility Model Implementation

Next, the utility model will be described in detail with reference to the figures of the drawings.

The inventive automatic injector is a collapsible device and contains (Fig. 1) placed in the housing 101, a cylindrical pusher 102 with a spring 103 mounted thereon and a karbul 104.

The autoinjector body 101 is a metal or plastic tube having a cone-shaped narrowing 105 on one side. The outer surface of the body has two sections with different diameters. The diameter of the end of the housing 106 facing the base of the carpula is slightly larger than the diameter of the end 107 facing the needle. On a narrower part of the housing 107 two pairs of rectangular holes are made - the first pair 108 is located at the neck of the carpool of the auto-injector in the ready state, and the second 109 - at the neck of the carpool of the auto-injector in the injection state. On the body, non-through longitudinal grooves 110 are made connecting these openings.

For free movement inside the housing, the spring 103 has an outer diameter slightly less than the inner diameter of the housing 101.

The pusher (Fig. 2) is made of plastic, preferably polyoxymethylene. On the pusher, a spring 201 movement limiter is arranged in the form of a barrier ring having a diameter slightly less than the inner diameter of the capsule 104. The limiter divides the pusher into the spring 203 and the spring 202 parts. A spring 103 is placed on the pusher spring portion 202. On this part, directly at the end of the pusher, a cylindrical groove 204 is machined. A lock 205 is made on the carbulent part of the pusher to fix the capsule during assembly of the autoinjector.

The trigger mechanism of the autoinjector can be made in any form known to the specialist. Suitable embodiments are disclosed, for example, in patents RU 2181057 C2 (publ. 10.04.2002) and RU 171991 U1 (publ. 23.06.2017). In one embodiment, the trigger mechanism consists of a trigger housing 125, two semicircular locking clips 111, a release button 112 and a protective cover 113. The semicircular clips 111 are made of plastic and have an outer diameter in the lower part equal to the outer diameter of the housing 101. In its upper parts of the clamps have an outer diameter less than the diameter of the lower part by the wall thickness of the protective cover 113. A cylindrical groove 114 is cut between the upper and lower parts of the clamps to fix the protective cover 113. On the inside it clamps the bottom surface comprises a protrusion allowing the clamps engage with the groove 204 of the cylindrical pusher. The release button 112 is a truncated plastic cone, with its apex facing clamps 111, having a hole inside with a diameter slightly larger than the outer diameter of the spring part of the pusher. On the side of the base of the cone, the shutter button is equipped with a protective cover 113 made of an elastic material, for example rubber. The lower part of the lid 113 engages with a groove 114 on the jaws 111. A blocker 115 made of the same materials as the housing is worn over the described trigger mechanism.

The spring stiffness, necessary and sufficient for the use of an automatic injector in specific conditions (for example, in a self-help kit for an employee of law enforcement agencies, when vaccinating civilians, in veterinary medicine of pets or cattle, etc.), is selected empirically by choosing the material , the method of its processing and the diameter of the turns of the spring.

The needle protection mechanism comprises a spring 116 and a protective cap 117. The protective cap is a plastic cylinder made with the possibility of sliding movement along the body of the auto-injector and has a cone-shaped narrowing 118 with a hole in the center on one side. On the side surface of the cap 117 there are two elastic retainers 119, made with the possibility of folding outward relative to the Central axis of the autoinjector. The latches 119 are designed to engage with rectangular holes 108 and 109 on the housing. The elastic retainers 119 can be made of plastic by thermoplastic. The inner diameter of the cap is slightly larger than the outer diameter of the housing, due to which the cap can freely move along the surface of the housing. On the other hand, the protective cap has a groove of a larger inner diameter for mounting a spring 116 that pushes the cap out after actuation and removal of the autoinjector.

Karpula 104 (Fig. 1) is a glass cylindrical container for a drug or prophylactic agent of the required capacity, onto which an aluminum cap 120 with a needle 121 previously fixed in it is installed by the run-in method. The needle of the karpula is protected by a rubber cover 124, dressed on an aluminum cap 120. Between the cap and the upper part of the “neck” of the glass container before running installed membrane 122 for separating the drug from the needle. Karpula is equipped with a stopper-piston 123, which is installed after filling the karpula with a drug.

The inventive automatic injector is collected and brought into operation as follows. The spring of the protective mechanism 116 is mounted on the body of the auto-injector in its narrower part 107, and the protective cap 117 is mounted on top of the spring by compressing the spring. The spring 103 is mounted on the pusher 102 of the carapace 102. The pusher 102 with the spring 103 is placed in the housing 101 by the spring to the trigger mechanism. Using a special tool, the spring 103 is compressed. The karpula 104 is mounted with a piston to the karpula pusher and fixed with the pusher 205. The karpula with the pusher is fixed in the trigger mechanism and the latter is screwed into the body 101 of the automatic injector. The automatic injector is ready to use.

In one embodiment, the fixation of the capsule in the trigger mechanism is as follows - a latch consisting of two semicircular locking clamps 111, with a protective cover 113 made of rubber on them, is mounted on the pusher of the capsule 102. On the inner surface of the clamps in the lower part has a protrusion that allows you to engage the clamps with a cylindrical groove 204 of the pusher. Downwardly install the blocker 115 on the trigger.

The injection using the inventive automatic auto-injector is as follows. An automatic injector is pressed against the injection site. When the trigger is triggered, the pusher 102, under the action of the spring 103, starts moving towards the capsule 104, presses on the piston plug 123, which leads to the movement of the capsule 104 in the housing 101. When the capsule wall moves, the elastic clips 119 are pushed out of the holes 108 corresponding to the ready position. The needle 121 leaves the body through the hole, penetrates the muscle tissue, rupture of the protective membrane 122 and the outflow of the drug. After the injection is completed, when the return movement from the surface of the body is completed, the spring of the protective mechanism 116 is released and presses on the protective cap 117. As a result, the elastic clips 119 under the action of the spring 116 make a sliding movement along the grooves of the software on the case until they engage with the second pair of holes 109 on the case. As a result, the protective cap is fixed in the extended position and closes the injection needle.

The inventive automatic injector has the following advantages. It is compact and easy to manufacture, the manufacture of most components does not require complex, high-precision equipment. The design of the inventive automatic injector provides reliable prevention of accidental post-injection wound with a needle.

The tests carried out allowed us to experimentally establish that the inventive automatic injector can be used to inject liquid drugs of various viscosities into muscle tissue directly or through clothing made of materials of different densities.

During the tests, the inventive automatic injector carried out model injections into an analogue of muscle tissue (silicone) through 16 layers of cotton fabric, through 6 layers of 2 mm porous cardboard, through 1.5 mm of genuine leather, while the needle did not deform, and the drug poured in the required volume.

Thus, the inventive automatic injector can be used in medicine, both civilian and military, as well as in veterinary medicine, for example during preventive-vaccination activities of the civilian population, to provide the necessary drugs to individual first-aid kits of power structures, in field and hospital hospitals of disaster medicine, as well as in the prevention and treatment of animal diseases, and its use can accelerate the provision of medical care.

Claims (1)

An automatic injector, consisting of a cylindrical body, on one side of which a conical narrowing is made with a hole in the center, behind which inside the body a needle is placed with a needle towards the hole, filled with a liquid drug or prophylactic and sealed with a piston stopper, behind which there is a cylindrical pusher with a put on a compressed spring is mounted on it, and on the other hand, a trigger mechanism is installed, characterized in that holes are made on the body, the first pair of which is located diametrically and at the level of the neck of the carpool of the auto-injector in the ready state, and the second at the level of the neck of the carpool of the auto-injector in the state of injection, a longitudinal recess is made on the body between the indicated holes, the needle protection mechanism consisting of the spring of the protective mechanism and the protective cap, which is a cylinder, is located on top of the body, made with the possibility of sliding movement along the body of the auto-injector, and having, on the one hand, a conical contraction commensurate with the body of the auto-injector, there are I elastic clamps, made with the possibility of engagement with holes on the housing, on the other hand of the protective cap there is a groove of a larger internal diameter for installing the spring of the protective mechanism, pushing the cap out after operation and removal of the auto-injector.

Images