RU216479U1 - AUTOMATIC INJECTOR - Google Patents

Abstract

The utility model relates to medicine, namely to devices for automatic intramuscular injection of a needle and a liquid drug, and can be used in the provision of emergency medical care to military personnel in the field. The injector consists of a plastic case with a hinged lid, in the cavity under which there are grooves for a cartridge (divided into two parts for two different drugs) with independent needles. The medicines contained in the cartridge are injected in parallel during use by means of a spring. The spring mechanism ensures the introduction of needles to a predetermined depth, followed by the injection of the contents of the cartridge. After the pusher piston spring is cocked, the cartridge is placed in the grooves inside the housing. Medicines in the cartridge after the descent of the locking mechanism move along the guides. The needles are covered with an elastic sheath, which is removed when passing through the holes in the hinged cover. The means of launching the device is to press the release button. 4 ill.

Description

The utility model relates to medicine, concerns a device for the sequential automatic injection of a needle and a liquid drug into muscle tissue and can be used in the provision of emergency medical care to military personnel in the field associated with poisoning with nerve agents and, if necessary, the introduction of antiallergic drugs, etc. .

The closest technical tool is an automatic injector for intramuscular injection [patent RU 204256 U1, publ. February 17, 2021]. In an automatic injector containing an external cylindrical body with a lid, a carpule sealed with a plug-piston, filled with a liquid drug, with a needle covered with an elastic sheath, shock-absorbing when actuated, placed in the inner body , located in the inner sleeve of the pusher rod with a spring put on it, having a locking mechanism at the opposite end of the pusher rod from the carpule in the form of elastic plates with hook protrusions at the ends, which are blocked by a safety pin inserted inside between the plates, in which part of the internal of the housing on the side of the needle is made with a smaller diameter, and the limited displacement of the inner housing into the outer one when pressed by the end of the inner housing at the injection site is a means of launching the device, the inner sleeve has a side, and the automatic injector additionally contains a sleeve for placing the carpula and a second a spring placed between the outer and inner bushings with the possibility of pressure on the side of the inner bushing. In this case, the inner housing is connected to the outer sleeve by means of a thread. The internal protrusion formed in the inner body at the junction of parts with different diameters serves as a means of stopping the movement of the additional sleeve with the carpule placed in it when the autoinjector is triggered. The lid is equipped with an insert with an opening in the form of a truncated cone widening inward in the center. The pusher rod is made with a thickening at the end and is provided with a ring for moving the cartridge piston plug. Part of the outer casing on the side of the cover is made with a thickening inside and forms a stop, and outside on the outer sleeve there is a retaining ring to limit the displacement of the inner casing along the gap formed between the outer sleeve and the outer casing, to the stop. The safety pin is connected to a curved plate having a ribbed surface on the part located at the end of the outer casing and designed to release the lock. The pusher rod is made with a thickening at the end and has an annular protrusion for pushing the plug-piston of the carpule. The carpula piston plug has a figured cutout for a thickening at the end of the pusher rod.

A significant disadvantage of the autoinjector patent RU 204256 U1 is that the injection is carried out only one medicinal substance.

Known syringe [RU 2417108 C1, dated 14.12.2009., A61M 5/19, A61M 5/32], containing a container with a cap at one end and an elastic membrane at the other end, a piston rod with a tip for installing a nozzle on it hollow needle, and the nozzle has a side hole, and the needle is located in the cylinder, characterized in that it includes at least one additional cylinder, and the cylinders are combined into a block, have the same / different diameters, a common cover and a common membrane, and the rods are connected between themselves. The principle of operation of this syringe is as follows: after removing the syringe from the package, the fixing pin is removed, the syringe membrane is pressed against the patient's skin and the rods with pistons are set in motion, while the tips of the needles pierce the membrane and the medicines in the cylinders through the side holes in the nozzles and needle cavities enter the patient's body.

The main disadvantages of this device are: medicinal substances are administered simultaneously with the penetration of the needles into the patient's body, i.e. infiltrating tissues in the direction of needle movement, which contradicts the requirements for intramuscular injections, and also leads to severe pain at the injection sites and insufficiently rapid administration and absorption of drugs. In addition, due to the design features, a significant amount of the drug remains in the cylinders after injection and, which is not unimportant, this syringe cannot be used for intravenous injections.

The inventive autoinjector is capable of administering two drugs without premature outflow.

The technical result is achieved by the fact that the autoinjector consists of a plastic case with a hinged lid, in the cavity under which there are grooves for a cartridge divided into two parts for two different drugs with independent needles, a shutter with a spring, a handle, pistons and a spring retainer are located in the case , and in the shutter there are grooves for fixing the cartridge that exclude rotation, holes for needles are provided in the lid, and the spring retainer is made with the possibility of releasing the spring pushing the cartridge to the top wall of the lid, so that the needles pass through the holes in the lid and stick into the body, after which the pistons begin to compress the volume of the liquid, giving out substance through the needles

Details of the inventive automatic injector are made of plastic or polymeric material, with the exception of the spring and needles. The stiffness of the spring, necessary and sufficient for use in power structures, is selected empirically by choosing the material, the method of its processing and the diameter of the coils of the springs.

The inventive auto injector is shown in FIG. 1, 2, 3, and 4.

In FIG. 1 shows a general view of the device - an auto-injector in a cocked and charged state;

in fig. 2 shows the auto-injector in a used state;

in fig. 3 shows cartridges for autoinjector 6;

in fig. 4 shows a diagram of an autoinjector, where

1 - openings for the exit of the needle in the cover, 2 - elastic shell, 3 - grooves for the movement of the shutter, 4 - needle, 5 - cover, 6 - cartridge with two containers, 7 - container piston, 8 - groove for the cartridge, 9 - shutter, 10 - locking mechanism, 11 - housing, 12 - spring, 13 - leg hole, 14 - leg, 15 - handle.

The body is a cuboid consisting of two parts: the body itself 11 and the cover 5. The body houses the shutter 9 with the spring 12, the shutter has grooves 8 for fixing the cartridge 6. The cartridge 6 consists of 2 containers, each has its own needle 4 under the elastic a shell that is pierced by a needle 4 during its departure from the holes 1 in the lid. Cartridge-container 6 is made with two sterile pre-filled containers.

When the handle of the syringe 15 is pulled towards itself, the latch 10 is activated, which holds the spring 12 in the cocked state, the cover of the body 5 is folded back, the cartridge 6 with substances is inserted into the cavity, grooves 8 are provided in the shutter to fix the container, excluding rotation; the housing cover 5 slams shut, the syringe is ready for use; when the latch 10 is pressed, the spring 12 is activated, it pushes the cartridge 6 up to the stop against the upper wall of the cover, the needles 4 pass through the holes 1 and stick into the body, after that the pistons 7 begin to compress the volume of the container, squeezing out the substance through the needles 4. The syringe may be stored cocked. After use, it is possible to replace the cartridge, which makes this auto-injector reusable, the cartridges are sterile and pre-filled.

The inventive auto-injector reliably ensures the administration of the drug during intramuscular injection due to the energy of the spring.

The significant advantages of the proposed automatic injector include the parallel administration of two medicinal substances, which ensures their synergy.

Claims (1)

An automatic injector, characterized in that it consists of a plastic case with a hinged lid, in the cavity under which grooves are made for a cartridge divided into two parts for two different drugs with independent needles, a shutter with a spring, a handle, pistons and a spring retainer are located in the case , moreover, grooves are provided in the shutter for fixing the cartridge to prevent rotation, holes for needles are provided in the lid, and the spring retainer is configured to release the spring pushing the cartridge to the top wall of the lid, so that the needles pass through the holes in the lid and stick into the body, after which the pistons begin to compress the volume of the liquid, squeezing out the substance through the needles.

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