UA16641U - Disposable syringe - Google Patents

Abstract

The disposable syringe contains the barrel with the tip and the needle. The piston with the cavity and the rod are enclosed inside the barrel. The syringe contains the appliance connecting the working chamber with the atmosphere designed as an additional needle installed free inside the barrel and a rod with the back pressure valve contacting with the blunt end of the needle. The pointed end of the needle at the moment of the injection contacts the membrane in the piston. The latter may be connected to the atmosphere through the openings.

Description

Description of the invention

The utility model belongs to medical equipment, namely to devices intended for one-time administration of drugs into the human body.

A known disposable medical syringe, which includes a body with a tip with a needle and a cap, a rod and a piston and which is equipped with a device for blocking the travel of the rod, |see German patent Mo1766788 Ab1M5/14 publ. 1968.1.

The disadvantage of this technical solution is that the device is located on the outside of the cylinder, it can be removed and the syringe reused.

A disposable medical syringe is known, which contains a variable cross-sectional hollow body with a tip and a needle, in which there is an interconnected rod and piston with a cuff and a node for increasing the diameter of the piston, made of a rod and retractable rollers, and retainers located in a radial hole in the piston, which can contact the cylindrical groove made on the rod. | see patent of Ukraine Mo11230 12 AV1MB/B50 pub. 25.12.96. year 1.

The disadvantage of the known technical solution is that it has a complex design and many parts and is intended for syringes with a variable cross-section of the body.

A single-use medical syringe is known, which contains a body with a tip with a needle and a cap, in the middle of which there is a piston with a cavity and a rod and a device for excluding the reuse of the syringe after injection in the form of a node for connecting and disconnecting the rod from the piston | see . patent of Ukraine Mo11232

AbI1M5/50 published on December 25, 1996. White. Mod).

The disadvantage of this technical solution, defined as the closest analogue, is that it has a complex design

There are many parts in the rod disconnection unit, which has a low possibility and reliability of rod disconnection.

The second disadvantage is that the disconnected rod can be glued again and the syringe can be reused. 29 The basis of a useful model is the task of creating such a syringe, in which there was the possibility of reliable pt") exclusion of reuse of the syringe after injection, simplification of the design and reduction of syringe parts.

The task is solved by the fact that the syringe, which contains a body with a tip and a needle, in the middle of which a piston with a cavity and a rod is placed, according to a useful model, the syringe is equipped with a node for connecting the working chamber of the syringe with the atmosphere and is made in in the form of an additional needle, installed in its cavity freely and equipped with a rod with a non-return valve, which contacts the blunt end of the needle, and the second pointed end of the needle at the time of injection contacts the membrane located in the piston, which contacts behind it, with the help of holes in the rod with atmosphere Gee)

The essence of the useful model is explained by the drawings: Fig. 1 shows the syringe before the injection, Fig. 2 shows the syringe after the injection, Fig. 3 shows the junction of the working chamber of the syringe with the atmosphere, Fig. 4A -- the second variant of the syringe is shown, Fig. 5 shows the third variant of the syringe, and Fig. b6 shows an additional membrane.

The syringe contains a cylindrical body 1 made of elastic material (plastic or polymer) or glass, a tip 2 with a needle C, a piston 4, a rod 5 with a pressed button 6.

The piston 4 is equipped with a node connecting the working chamber 7 to the atmosphere and contains an additional needle 8 freely C 50 installed in the cavity 9 and equipped with a rod 10, on the end of which a non-return valve 11 is installed in the form of an elastic sheet, the end of which is glued to the end of the rod 10, and the sharp end of the needle 8 is in contact with

With" membrane 12, which is installed in the cavity 9 and which is in contact with the atmosphere with the help of holes 13 and 14.

The membrane 12 can be made of paper (soft cardboard) with a glossy coating or a coating of an elastic material such as rubber or polymer.

Fig. 4 shows a syringe, which has a projection 15 for completely squeezing out the medicine.

Ge") cavity 9 during the free introduction of drugs, the rod is made in the shape of a mushroom 16, the head of which is connected to a thin rubber additional membrane 17 in the form of a washer, which is glued to the head of the rod 16 and to the b piston 4. Thanks to a larger plane, the rod will move reliably. и» 20 Check valve 18 is made of a membrane using an incomplete cutout.

So that the rod 10 does not fall out of the piston when taking medicine, the piston can be equipped with a cover 19, which is glued to the end of the piston, or on the end of the cavity 9, in which the rod 10 is located, two or more protrusions are made with the help of a corner 20, by hot extrusion fFig. 3.

The syringe works as follows: when taking medicine, when the piston 4 moves away from the tip 2, a discharge occurs in the working chamber 29 7, the non-return valves 11 and 18 open, but due to the fact that the hole 14 is closed with the membrane 12, air cannot enter the working chamber chamber 7 and therefore medicine will fill the syringe.

After that, turn the syringe to the mountain with the needle and press button 6 to squeeze the air out of the syringe.

The syringe is ready for injection.

During the injection in the working chamber 7 there is an increased pressure from the side of the liquid, which acts on the end of the rod 10 60 | it moves along the cavity 9 as the air is compressed between the membrane 12 and the end of the rod 10, an additional needle pierces the membrane 12 and connects to the atmosphere with the help of holes 13 and 14, but the non-return valves 11 and 18 are closed by the increased pressure of the liquid, so the air will not flow into working chamber 7.

When reusing the syringe, when taking medicine in the working chamber 7, a discharge occurs and the non-return valve opens and air through the holes 13 and 14, and then through the needle 8 gets into the working chamber 7 and the medicine will not fill the syringe.

To simplify the adjustment of the surface of the rod 10 relative to the surface of the cavity U, the rod can be equipped with a cuff in the form of a rubber ring 21.

Claims (1)

2 Formula of the invention A disposable medical syringe containing a body with a tip and a needle, inside which a piston with a cavity and a rod are placed, which is distinguished by the fact that the syringe is equipped with a node for connecting the working chamber of the syringe with the atmosphere and is made in the form of an additional needle installed in the cavity freely and equipped with a rod with a non-return valve, which contacts the blunt end of the needle, and the second pointed end of the needle at the moment of injection contacts the membrane located in the piston, which is in contact with the atmosphere through holes in the rod. that 2 "- " (Se) (Se) yo - and? - (22) (22) sh» - 60 b5