UA76651C2 - Disposable syringe - Google Patents

Abstract

The invention relates to the medical equipment, in particular to the disposable syringes for injecting the drugs as well as for sampling the blood and other fluids. The disposable syringe is equipped by special appliance preventing its repeated use. Such a design of the syringe may be regarded as the effective means for preventing the spread of the infectious diseases especially manipulating in patients being at risk of AIDS. The design of the disposable syringe provides for the forced and secured failure of the syringe after its single use. Such a design does not require any additional manipulations. The novel feature in the design of the disposable syringes consists in the specific connection between the rod and the piston ensuring the disconnection between rod and the piston and disabling the syringe upon complete or partial injection or upon the least attempt to move the rod in the direction opposite to that in the process of injection.

Description

Description of the invention

The invention belongs to medical equipment, namely to single-use syringes for injecting medicinal 2 or any other drugs into the body, as well as taking blood and other substances from the body, which have a special means of protection against repeated use.

Single-use syringes are known, in which a means is provided that excludes their reuse, for example, by destroying the connection of the piston with the stem directly during the introduction or after the introduction of the drug during the reverse movement of the stem, see patent of the Russian Federation No. 2004103211, AETMO/90, 2004.1 or as a result of jamming 70 of the piston with the rod in the syringe chamber after the introduction of the drug | see patent of Ukraine Mo 11230, AbЕ1МО/90, 1993; Russian patent No. 92008201, AbE1MO/90, 1999).

In known devices, means of protection against repeated use are quite complex structures, contain additional elements (for example, microneedles, fasteners, etc.), and are activated only when mandatory conditions are met or when the user performs certain conscious actions (for example, reaching a certain position with the 12 piston ).

The closest combination of features and technical result to the claimed invention is a disposable syringe, which has common essential features: a cylindrical body open on both sides, with a partition on one side in which a needle is fixed, a piston with a rod and a grip placed inside the body on its end, as well as a means of protection against repeated use of the syringe | see patent of Ukraine Mo 11186, cl. A6E1MO/90, 1990...

The disadvantage of the known device, taken as a prototype, is a series of complex manipulations due to the need for a special rotation of the rod, which leads to its physical destruction in the place of the annular groove, as well as a complete loss of the drug through the annular gap and the transverse hole of the piston in the event of failure to perform physical destruction manipulations stem with

Thus, the means of protection against repeated use in the known device works only under the condition that Ge) consciously performs additional manipulations, and in fact does not exclude the repeated use of the syringe in case of failure to perform the indicated manipulations, and depends entirely on the desire or awareness of the user.

The closest thing to the claimed invention is a disposable syringe (French patent Mo2676928 dated 04.12.1992), which has a body with a receiver, in the middle of which there is a piston, a rod and a device for (one-time!) connection of the piston with the rod. yu

The device for (one-time) connection of the piston with the rod is made in the form of a convex element on the back of the piston and a fixing element on the rod. The convex element has a groove with a slot in which, before taking the medicinal product, with the possibility of release, a fixing element is installed. Gee)

Medicinal product is understood as medicinal or any other preparation (substance). 3o After the injection, when trying to re-take, the fixing element is released from its locked position.

The disadvantages of the previously mentioned syringe include:

The unreliability of the connection of the fixing element (a device for one-time connection), since the fixing element is made only in the form of a single protrusion, which unilaterally fixes the rod, thereby not excluding the possibility of repeated use. c The invention is based on the task of creating a single-use syringe design that is reliable in use and easy to manufacture, which would not require any additional manipulations, would not require the achievement of certain conditions, and would guarantee (forced) the reuse of the syringe.

The technical result of the invention is the simplification of the design and technique of safe use of a disposable 7 syringe.

Ge") To solve the given problem in a disposable syringe, which consists of a cylindrical body with a needle receiver to which a needle is attached. b In the middle of the housing there is a piston with a rod with a device for one-time connection of the piston with a 20 rod.

The device for (one-time) connection provides automatic disconnection of the rod from the piston after

From the full or partial introduction of the drug and the slightest attempt to move the rod in a direction that is opposite to the direction of movement of the rod during the introduction of the drug.

Automatic disconnection occurs due to the implementation of a device for one-time connection in the form of a convex element on the back of the piston and a fixing element on the rod.

GF) The specified essential features are necessary and sufficient for the implementation of the invention and the achievement of a technical result. The essence of the invention is explained by the drawing, where Fig. 1 shows a section of a single-use syringe with all structural elements (in the initial position (before taking the medicine));

Fig. 2 is a three-dimensional (volumetric) image of a piston, a rod connected by a device for a one-time connection; Fig. 3 and Fig. 4 - the location of the structural elements of the syringe in the process of taking the medicine;

Fig. 9 - the location of the structural elements of the syringe after the injection, when trying to re-take;

Fig. 6 - longitudinal section of the piston (Fig. 9). because the Syringe consists of a housing 1 and a piston 2 and a rod 3 connected to it, which are placed in it with the possibility of longitudinal movement. The connection is made by a device for a one-time connection 4. The housing 1 has a receiver 5 on one end (Fig. 1) , and on the other - a stop bar 6.

The connection device 4 (Fig. 1, 6) is made in the form of a convex element 7 on the back side of the piston 2 (in its center) and a fixing element 8 on the rod 3.

Fixing element 8 is made in the form of disks (9, 10) rigidly connected to each other and to the rod Z. Disk 9 is the upper one, and disk 10 is the lower one, while the diameter of these disks corresponds to the inner diameter of the housing 1.

The rod C is made in the form of a rod with stiffening ribs 11 (Fig. 3-5) and has a grip 12 in the part opposite to the fixing element 8. 70 The base of the disks has a hole 13, and the rod C and stiffening ribs 11 have a groove 14 (Fig .3-5), which are made with the possibility of entering the convex element 7; the dimensions and shape of which correspond to the external dimensions and perimeter of the base of the convex element 7 of piston 2.

The end of the disks (9, 10) has a groove 15 (Fig. 2) in which the axis 21 is installed, with the possibility of its free movement, both along the groove and along the previously indicated hole 13 (Fig. 5).

The convex element 7 has grooves 16 and a slot 17 (Fig. b), which have a common side surface, which has a thinned flexible section 18, which connects them at the point of rupture 19, and at the point of its continuation contains a flexible retainer 20 in the form of a tongue.

The tab 20 divides the slot 17 into two cavities (under and above the tab, Fig. 1, 6) and rests on the support section 22, made on the side surface opposite to the thinned flexible section 18 (the cavities are sufficient for the free passage of the axis 21, and the thinned flexible section 18, as well as tongue 20, are made with the possibility of bending).

We will describe the principle of using a disposable syringe:

Before the start of taking drugs into the syringe, the lower disc 10 fits tightly against the surface of the piston 2, and its convex element 7 is placed in the holes of the upper 9 and lower discs 10, as well as in the groove 14 of the rod 3, while the axis 21 is located under the tab 20 ( Fig. 1). high school

The axis 21 is in the initial position under the tongue 20 (Fig. 1).

Medicines are taken by progressively pulling out the rod Z from the housing 1, holding it by i) the stop bar 6 and pulling the gripper 12. At the beginning of the translational movement of the rod Z, the pulling (physical) force is transmitted to the axis 21, which bends the tab 20 and moves over by it, leaning against the end wall of the slot 17, transferring the force applied to the gripper 12 to the piston 2, thereby ensuring its longitudinal movement inside the housing 1.

When introducing a medicinal product (injection), hold the body 1 by the stop bar 6, press o on the gripper 12, transmitting force, make the rod 3 move forward.

During the translational movement of the rod Z, the force is transmitted to the axis 21, which, sliding along the surface of the tongue 20, resting on the end wall of the slot 17, bends the flexible thinned section 18, and moving further rests against the ise)

From the bottom of the groove 16 (rear side of the piston 2) transmitting the force to it (not shown). uh-

When attempting to re-take and inject the drug, the movement of the axis 21 will be possible only along the groove 16 of the convex element 7 of the piston 2 (Fig.b), as a result of which the piston 2 will be disconnected from the rod 3. If we assume that the axis 21 will enter the slot 17 then the tab 20, resting against the support section 22 of the side surface of the slot, prevents its reverse deflection (Fig.b), as a result of which the piston 2 cannot be connected to the "70" of the rod Z, which means that the injection can be performed. with with with"

Claims (2)

The formula of the invention 1. A single-use syringe, having a body with a needle holder on one end and a stop - on the other, - inside the body there is a piston, a rod with stiffening ribs and a device for a one-time connection of the piston to the rod, and a device for a one-time connection of the piston with the rod is made in the form of (22) a convex element on the back side of the piston and a fixation element on the rod, while the convex FO element has a groove with a slot in which a fixation element is installed before taking the medicinal product (with the possibility of release), which after the injection (trying to retake) is released from 1 fixed position, which is distinguished by the fact that the groove and the slot have a common side surface, which has a thinned section with a gap connecting them, and the continuation of the common side surface has a flexible tab-shaped retainer, the edge of which rests against the support section of the side surface of the slot, which is opposite to the thinned section, and the fixing element is made in in the form of discs rigidly connected to each other and the rod, the base of which has a hole, and the rod - a groove, made with the possibility of entering a convex element, and the end of the discs has a groove in which an axis is installed, made with the possibility of free movement along the groove and ( F) across the previously mentioned opening, fixation by the tongue, bending of the tongue and the thinned area when taking the GI medicine and releasing the convex element from the groove when trying to take the medicine again. 2. Single-use syringe according to p. 1-7, which differs in that the diameter of the discs corresponds to the inner diameter of the body. b5