RU1777896C - Syringe - Google Patents

Abstract

Usage: during injection. SUMMARY OF THE INVENTION: when filling the internal cavity, the back of the piston is provided with hollow needles, and at the end end inside the cylinder there is a vacuum container made of plastic, comprising 0.1 ... 0.15 of the working capacity of the cylinder, and one-way valves are installed in the hollow needles. 1 s P. f-ly, 1 ill.

Description

The invention relates to medical equipment and can be used as a syringe for injection.

A syringe is known comprising a cylinder with a piston, a tip and a sealing element.

The prototype device cannot fully exclude the air content in the working volume of the cylinder.

An object of the invention is to eliminate the air content of a drug substance in the working volume of a cylinder.

This goal is achieved by the fact that the back of the piston is equipped with hollow needles, which, when the drug is sucked, pierce the evacuated container, as a result of which the suction increases.

The drawing shows a diagram of a syringe.

The syringe comprises a cylinder 1 in which a piston 2 is mounted with axial longitudinal movement and is rigidly connected by a rod 3 with a pusher 4. A tip 5 is located on the working end of the cylinder 1, and a cover 6 is located on the opposite end. On which a plastic evacuated cavity 7 is installed. from all sides. On the back of the piston 2 there are hollow needles 8, in the channels of which valves 9 are installed, having one-sided action. The cylinder has a working cavity 10 for filling with a drug.

The device operates as follows.

A tip is put on the tip 5, which is lowered into the drug capsule. Stem 3 with piston 2 retracts and drug absorption begins. When the hollow needles reach the evacuated container 7, the latter is punctured, as a result of which the vacuum increases, and the working cavity 10 is completely filled with the drug. Air bubbles that have fallen during fluid collection due to sparse through the cavity of the needles 8 are removed from the working part of the cylinder 10.

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valves 9 (close) automatically at the end of stroke of piston 2.

During the stroke of the piston 2, the drug is squeezed out of the working part of the cylinder 10.

The evacuated cavity 7 is made of plastic, since this material has sufficient physical and mechanical characteristics to withstand pressure drops and at the same time to be pierced by a needle.

The volume of the evacuated tank 7, which is 0.1 ... 0.15 of the working volume of the cylinder, is chosen experimentally and verified experimentally and ensures guaranteed fulfillment of the goal.

Achieved qualitative effect: complete filling of the working cavity of the cylinder without the presence of air.

The device can be implemented in both disposable and reusable syringes.

Claims (2)

The claims 1, A syringe comprising a body in the form of a cylinder with a cannula and a piston disposed therein with a one-way valve, characterized in that. in order to exclude the air content in the medicinal substance in the working volume of the cylinder, it is equipped with elastic evacuated containers from the side opposite to the bottom of the cylinder, and the piston, on the same side, is equipped with hollow needles, in the cavities of which single-acting valves are installed, while the needles configured to interact with capacities, 2. A syringe according to claim 1, characterized in that the volume of the evacuated containers is 0.1-0.15 of the working volume of the cylinder.