SU1230600A2 - Needleless injector - Google Patents

Description

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The invention relates to veterinary technology, namely to devices for administering preparations without a needle method, and is an improvement of the known device according to the authors. St. No. 835448.

The purpose of the invention is to increase the reliability of operation of the injector under reduced gas pressure.

The drawing shows a diagram of a needleless injector (without an executive unit).

The injector consists of a pneumatic distribution unit 1, a power unit 2 and an executive unit (not shown). In the case of the power unit, there is a working piston 3 connected to the plunger 4. The piston 3 is preloaded by the return spring 5. The sub plunger cavity 6 is connected on one side through the reverse pan 7 to the vial for the preparation 8, and on the other side the flexible high pressure hose 9 to the housing executive unit.

The pneumatic distribution unit has two bore chambers: a separating chamber 10 and a control pneumatic chamber. 11. A piston 12 is installed in the control pneumatic chamber, as well as a check valve 13, the piston 12 is connected to the rod 14 and divides the pneumocamera into two cavities: the piston and rod. A compression spring 15 is installed in the piston cavity. The piston and rod end communicate with a source of compressed air, and a throttle 16 is installed in the channel connecting the piston cavity and the channel for supplying compressed air — adjustable local resistance to overflowing air. Three channels emerge into the separating chamber 10, one of which connects the chamber with the cavity of the power unit, the other with the atmosphere, and the third with the control pneumatic chamber and a source of compressed air. In the same channel is located the rod 14 connected to the piston 12 and leaving the free end into the separating chamber. This end of the rod is equipped with two sealing elements 17, one of which is located at the end, and the other on the annular ledge on the reverse side

VNIIPI Yakaz 2472/7

Circulation 660

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of air.

Between the power and distribution blocks, there is a needle lever (B, which, by means of, the Mr. Muscle 19 can contact the valve 13, and

0 by means of a pusher 20 - with a piston 3 (at the end of its working stroke).

The device operates as follows.

In the initial position, when air under pressure enters both the piston and rod cavities of the control pneumatic valve 11, the rod 14, with the action of the spring 15 and the air pressure force, closes with its end the channel that communicates the dividing chamber 10 with the atmosphere and provides access compressed air under the working piston 3,

When the injector is triggered, the worker

 the piston 3 at the end of the working stroke through the pusher 19 and 20 and the lever 18 opens the valve 13, together with the piston chamber of the control chamber with the atmosphere, while the air pressure in

0, this cavity drops sharply, and the piston 12, together with the rod 14, under the action of air pressure in the rod cavity of the control chamber (prevailing over the action of the spring 15) quickly

5 is displaced by shutting off access of compressed air to chamber 10 and opening the exit to air from under the working piston of the power unit through chamber 10 to the atmosphere. The piston 3 under the action of the spring 40 returns to its original position, when the injector recharges with a new portion of the drug, the return valve 13 closes. After some time, determined by the setting of the throttle, the pressure in the piston

cavity chamber 11 increases again. and the piston 12 with the rod 14 under the spring of the spring 15 also returns to its original position when the hole connecting the chamber 10 with the atmosphere is closed, but access of the compressed air under the piston 3 is opened, i.e. The barrel cycle of the injector is completed and it is again ready to fire a dose of pre-para.

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Claims (1)

BEARLESS INJECTOR by ed. St. No. 835448, characterized in that, in order to increase the reliability of the injector at reduced gas pressure, the piston of the pneumatic chamber is spring-loaded relative to its body and connected to the distributor rod, and the pneumatic chamber is additionally connected to the source of compressed air by its rod cavity. ) C (O SU ,, 1230600