RU171991U1 - AUTOMATIC INJECTOR - 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 for the population and emergency assistance to people and animals in emergency situations, as well as self-help and mutual assistance to military personnel in the military The technical result is to prevent the possibility of accidental operation of the device during its operation. The technical result is achieved by the fact that in the inventive automatic injector a fixation and blocking system is applied, which excludes its involuntary operation.

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 sequential automatic injection of a needle and a liquid drug into muscle tissue and can be used in emergency medical care for the population and emergency assistance to people and animals in emergency situations, as well as self-help and mutual assistance to military personnel in the military conditions, including for the rapid introduction of antidotes in the case of the use of chemical weapons.

State of the art

Among the devices for automatic injection of injection liquids is the development of RU 2340362 (publ. 10.12.2008), which contains a rod with the ability to be inserted into the battery (6) and locked in the inserted position, and extend when the battery is released (6). The inner diameter of the sleeve essentially corresponds to the outer diameter of the ampoule (13). On the inner surface of the sleeve (16), protrusions (17) extending radially inward are made. The sleeve (16) contains locking elements that interact with the locking elements (20) of the needle guide (14), so that the axial movement of the ampoule (13) in the direction of the needle guide (14), overcoming the resistance provided by the protrusions (17), leads to the release of the blocking elements (20) and the possibility of axial movement of the guide (14) of the needle. The device provides the exception of depressurization of the ampoule as a result of accidental shock or other mechanical shock.

The specified automatic injector provides the introduction of the drug to a given depth due to the energy of the compressed spring.

The closest technical solution is a device for intramuscular injection with a cannula covered with an elastic sheath [US 3882863, publ. 05/13/1975], containing a rod with a spring, a cocked spring fixation system, a cocked spring fixation system lock, an ampoule with a medicinal product, a needle for injecting a medicine installed separately from the ampoule.

The system for fixing and locking the device in question has a number of disadvantages that can lead to spontaneous operation of the device. The locking system is a plastic protrusion that bends inward, made at the end of the rod, which clicks when the spring is cocked by the ring. The area of retention (engagement) of the protrusions is very small due to the structure with this principle of fixation. It should be immediately noted that in the inventive automatic injector this area is 3-3.5 times larger. Since the material for the manufacture of the stem is plastic, and the spring force is large, it is possible for the stem to exit from the fixation position with further involuntary operation of the injector even with the lock installed. With the lock removed, the likelihood of involuntary operation increases.

Another disadvantage is the small thickness of the shoulders of the pusher protrusions, since they are a non-integral cylindrical structure, and cut in the middle, for installing a blocker in this section. In the case of material heterogeneity in the place of the shoulders of the protrusions, the material may break and further involuntarily trigger the injector, in which such a principle of fixation is implemented. It should be noted that in the inventive automatic injector, this part is whole-cylindrical, which virtually eliminates the disruption of the pusher during the destruction of its upper part and the spontaneous operation of the device.

Also a significant drawback is both the complexity of the design of the automatic injector as a whole, and the fixation and blocking systems separately. For the high-quality manufacturing of all parts, especially small ones, the use of complex and accurate equipment, in particular, injection molding, is required.

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

Utility Model Disclosure

The objective of the claimed utility model is to increase reliability during operation by providing a warning for spontaneous injection.

The technical result consists in preventing the possibility of accidental operation of the device during its operation, especially in extreme conditions.

The specified technical result is achieved by the fact that in the inventive automatic injector a fixing and blocking system is applied, excluding its involuntary operation.

As the claimed utility model, an automatic injector is proposed having a cylindrical body, on one side of which there is a lid with a hole in the center, behind which inside the body with a needle towards the hole there is a carpule with a locking-guiding device, filled with liquid medicine or prophylactic and sealed with a stopper - a piston, behind which there is a cylindrical pusher with a compressed spring on it, and on the other hand, a trigger and a lock are installed, while The holder has a spring limiter that separates the pusher into the karbul and spring parts, the trigger mechanism consists of a cylindrical cover and a pusher lock, at the end of the pusher protruding from the housing through an opening in the trigger cover, a groove is pierced directly above the level of the hole, onto which is worn on top the pusher lock, which is made in the form of a longitudinal plate with a length greater than the diameter of the blocking cap put on top, with one end rounded accordingly to the arc of the lid, while the end is bent at an angle of 90 °, and has a symmetrical figured cut formed by pairing an incomplete circle hole with a semicircular hole of a smaller diameter, the plate is made with the possibility of translational movement in a rectangular cut along the bottom of the trigger cover, while in the locked position the pusher is at grooves inserted in a semicircular cutout, a cylindrical lock mounted on top of the retainer plate, has a hole in the center through which a small portion of the spring hour protrudes and the pusher, and on the side from its lower edge and almost to the top, the blocker has a cutout for the protruding part of the retainer plate, moreover, from one upper corner of the cutout, a slot is made further around the circumference, into which, when the lock is turned, the lock plate enters when it is locked, the starting means is the translational movement of the retainer plate in the direction to the axis of the housing.

Preferably, in the automatic injector, the spring limiter is located in the center of the pusher and is made in the form of a barrier ring.

Further, it is preferable that the pusher be divided by the spring stop into two parts having different diameters, the diameter of the wider part of the pusher in direct contact with the karbul being smaller than the inner diameter of the kerpule piston tube.

It is further preferred that the fixing-guiding device is a foam ring worn on the aluminum capsule of the carpula

It is also preferable if the opening of the lid at the end of the housing from the side of the capsule is covered with latex film.

Brief Description of the Drawings

In FIG. 1 shows a General view in section.

In FIG. 2 is a schematic illustration of an automatic injector assembly.

In FIG. 3 shows the pusher.

In FIG. 4 shows a spring.

In FIG. 5 shows the trigger cover.

In FIG. 6 shows the pusher latch.

In FIG. 7 shows a blocker.

Utility Model Implementation

Next, a utility model will be described in detail with reference to 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 is a metal or plastic, preferably a carbon fiber tube with an inner and outer diameter, preferably 14 mm and 16 mm, respectively, at both ends of which a thread is made for a sufficient length, preferably an M16 × 0.75 thread for a length of 15 mm.

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. 3) is made of plastic, preferably polyoxymethylene. In the center of the pusher, a spring limiter 305 is arranged in the form of a barrier ring, which divides the pusher into karpulny 306 and spring 307 parts with different diameters. The diameter of the carbulus part of the pusher in direct contact with the carpule 104 is slightly smaller than the diameter of the capsule. Spring 103 is located on the narrower portion 307 of the pusher. On this part, directly at the end of the pusher, a cylindrical groove 308 is machined.

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 403 (Fig. 4).

At the end of the housing 101 (Fig. 1), in the part where the spring 103 is located, the trigger cover 109 is placed, which is screwed onto the housing of the automatic injector by means of an internal thread, preferably M16 × 0.75.

In the trigger mechanism 509 (Fig. 5) there is an opening 510 with a diameter equal to the diameter of the spring part of the pusher. The end part of the pusher with a groove 308 (Fig. 3), into which the latch 211 is installed (Fig. 2), protrudes outward through the hole 510.

The latch 611 (Fig. 6) is a longitudinal plate, preferably made of stainless steel, with 9 ends rounded accordingly to the trigger arcs, one of which is an abutment 612 bent at an angle of 90 °. At the same time, the length of the lock with the bent stop is larger than the outer diameter of the lock 215 (Fig. 2) by the thickness of the lock, which is necessary to rotate the lock 215 around the axis of the trigger 209.

The latch is made with the possibility of horizontal movement along the rectangular groove 526 (Fig. 5) of the trigger mechanism 509. Thus, the dimensions of the latch are limited by the width and depth of the rectangular groove 526, as well as the outer diameter of the trigger mechanism 509. The thickness of the latch 611 corresponds to the width of the groove 308 of the pusher 102.

A half-hole 613 in the form of a semicircle with a diameter equal to the diameter of the pusher at the location of the groove 308 is located along the longitudinal axis of the latch 611 (Fig. 6). An incomplete hole 614 with a diameter equal to the diameter of the spring part 307 of the pusher is located along the longitudinal axis of the latch 611 and is associated with half-hole 613.

The lock 715 (Fig. 7) is made of stainless alloy, preferably stainless steel, and is a cylindrical cover mounted on the trigger 509 over the latch 611, rotatable around the trigger 509. A groove 716 is made in the upper part of the lock around the circumference, into which the protruding part of the latch 611 (emphasis 612) moves during rotation, a cut is made in the lateral part of the lock, reaching the top of the groove with a width equal to the width of the bent part of the latch. In the center of the lock cover for centering the pusher during cocking, there is an opening 726 with a diameter equal to the diameter of the spring part of the pusher.

At the other end of the housing 101 (Fig. 1), for protection and orientation of the needle 125, a cylindrical cover 117 with an internal thread is screwed, preferably M16 × 0.75, in the center of which there is an opening 118. There is a groove 120 at the end of the cover 117 from the outside 0.3 mm deep for installing a protective film, preferably latex.

Karpula 104 (Fig. 1) is a glass cylindrical container for a drug or prophylactic agent of the required capacity, onto which an aluminum cap 119 with a needle 121 previously fixed in it is installed by the rolling method. The needle of the karpula is protected by a rubber cover 125 worn on the aluminum cap 119. 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 carpula is fixed in the housing 101 of the inventive automatic injector with a foam ring 124. Alternatively, a spring of low elasticity can be used as a locking device.

The inventive automatic injector is collected and brought into operation as follows (Fig. 2). A trigger 209 is screwed onto the body of the automatic injector 201. A spring 203 is mounted on the pusher 202. The pusher 202 with the spring 203 is placed in the housing 201 by the spring to the trigger. Using a special tool, compress the spring 203. When the pusher 202 appears in the hole in the trigger mechanism 209, the latch 211 is mounted on it through the incomplete hole 614. The latch 211 is moved to the side until the half-hole 613 enters a special groove 308 in the pusher 202, thereby pusher 202 is fixed with a cocked spring 203 in the trigger 209. Move down the blocker 215 to the trigger 209. The lock 215 is turned clockwise until the protruding portion 612 of the retainer 611 enters the groove 716. Karpul at 204, they are installed in the housing 201 by a piston to the carbule pusher. The carpula is fixed with a foam ring 124. A cover 117 is screwed on the side of the housing 201 opposite to the trigger 209. A protective film is installed in the groove 120. The automatic injector is ready to use.

The injection using the inventive automatic auto-injector is as follows. The lock 115 is rotated counterclockwise until the protruding part 612 of the lock 611 leaves the groove 716. By moving up, the lock 115 is removed from the trigger 109. The automatic injector is pressed to the injection site. The trigger 211 of the trigger 209 is moved toward the center of the trigger 209, while the half-hole 613 of the trigger 211 comes out of the groove 308 of the pusher 102. The pusher 102, under the action of the spring 103, begins to move towards the capsule 104 through the incomplete hole 614, through the hole 510 of the trigger 109, presses on the piston plug 123, which leads to the movement of the capsule 104 in the housing 101, the subsequent exit of the needle 121 from the housing through the hole 118, the penetration of the needle into the muscle tissue, rupture of the protective membrane 122 and the outflow of the drug.

The inventive automatic injector has the following advantages. It is compact, since the small-sized retainer is the most protruding part of it. It is also easy to manufacture, has only 8 components, the manufacture of most of them does not require complex, high-precision equipment. The design of the inventive automatic injector provides reliable prevention of spontaneous injection and prevents the possibility of accidental operation during its operation.

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 (5)

1. An automatic injector having a cylindrical body, on one side of which there is a lid with a hole in the center, behind which inside the case with a needle towards the hole there is a carpule with a locking-guiding device, filled with liquid medicinal or prophylactic means and sealed with a piston stopper, behind which there is a cylindrical pusher with a compressed spring on it, and on the other hand, a trigger and a lock are installed, characterized in that the pusher has a spring limiter, a cat the second part separates the pusher into the karpul and spring parts, the trigger mechanism consists of a cylindrical cover and a pusher lock, at the end of the pusher protruding from the housing through an opening in the trigger mechanism cover, a groove is pierced directly above the level of the hole, on which the pusher lock is mounted on top, which is made in the form of a longitudinal plate with a length greater than the diameter of the locking cap put on top, with one end rounded accordingly to the arc of the lid, while the other end is bent at an angle of 90 °, and has symmetrical shaped cut-out formed by pairing an incomplete circle hole with a semicircular hole of smaller diameter, the plate is made with the possibility of translational movement in a rectangular cut along the bottom of the trigger mechanism cover, while in the locked position the pusher at the groove level is inserted into the semicircular cut-out, a cylindrical lock, worn on top of the retainer plate, in the center has a hole through which a small portion of the spring part of the pusher protrudes, and on the side of The bottom of its edge and almost to the top of the lock has a cutout for the protruding part of the lock plate, and from one upper corner of the cutout, a slot is made further around the circumference, into which, when the lock is turned, the lock plate enters when it is locked, while the translational movement of the lock plate direction to the axis of the housing. 2. The automatic injector according to claim 1, characterized in that the spring stop is located in the center of the pusher and is made in the form of a barrier ring. 3. The automatic injector according to claim 1 or 2, characterized in that the pusher is divided by a spring limiter into two parts having different diameters, the diameter of the wider part of the pusher directly in contact with the karbul being smaller than the inner diameter of the karpula piston tube. 4. The automatic injector according to claim 1 or 2, characterized in that the locking-guiding device is a foam ring worn on an aluminum cap of the capsule. 5. The automatic injector according to claim 1 or 2, characterized in that the opening of the lid at the end of the housing from the side of the capsule is closed with a latex film.

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