Syringe

 

(57) Abstract:

The syringe relates to medical engineering, in particular to injection devices single use. The syringe includes a housing provided with a hole-nests on the outside of the arm, in which is inserted a piston having with outside parties cylindrical with an annular groove of rectangular cross-section, and a needle. The hollow rod is provided with two annular projections at the front and two tabs-the tabs on the inside of the arm. The technical result consists in the exclusion of possible locking elements syringe in case of rough handling. 1 Il.

The invention relates to medical engineering, in particular to injection devices single use.

Known disposable syringe for injections, consisting of a body, a needle, piston, equipped with outside parties cylindrical tip with a circular groove of rectangular cross-section, a hollow shaft with internal two annular ledges near the end and an open ring-spring of rectangular cross section (patent RU 2104047).

This device is intended for a single injection. The disadvantage of this device is tanecnica piston and lock the latter in stock. In addition, in the transport position due to the presence of free play between the rod, the piston and the end of the body may zamorazhivanie rod and piston careless handling (shaking, throwing, and others).

The objective of the invention is the exclusion of possible locking of the cylindrical tip of the piston rod and the end of the rod and piston in the transport position in case of rough handling.

This is achieved by the fact that the syringe is provided with a split sleeve-spring with an internal annular ledge near the end of the corresponding circular groove of rectangular cross-section on the cylindrical tip of the piston, crank shaft with inner side provided with two diametrically opposed ledges-holders, and the outer side of the handle housing - related words-jacks.

The presence of the split sleeve spring with an internal annular ledge near the end of the corresponding circular groove on the cylindrical tip of the piston avoids jamming of the piston in stock at their separation, and the presence of two tabs-the tabs on the handle shaft on the inner side and holes-slots corresponding to the outer side of the arm body, prevents from Samarasya the Noah sleeve-spring to appoint at least half the diameter of the hole of the stem.

The invention is illustrated in the drawing.

The syringe includes: a housing 1, the outer side of the arm which is equipped with a hole-nests; the piston 2 having with outside parties cylindrical With a circular groove D of rectangular cross section; a hollow shaft 3, provided with two internal annular projections M and N at the end and two tabs-the tabs on the inner side of the arm; a split sleeve-spring 4 with an internal annular ledge at the side; the needle 5.

The syringe works as follows.

In the transport condition and before injection, the piston 2 is at the bottom of the body 1 of the syringe, the piston rod 3 attached to the piston 2, the ledge To the split sleeve spring 4 is in the slot D on the ledge M, the tabs are in the holes And preventing zamorazhivanie of the piston 2 and piston rod 3. When the set of solution of the rod 3 moves the piston 2 due to the contact of the split sleeve spring 4 with the ledge N and groove wall D.

When injecting the stem 3 is moved down until it stops outside the end face of the piston 2. This split sleeve-spring moves off the ledge M and dispersed, leaving the groove On without possible errors, freeing the cylindrical tip of the piston 2 from the engagement.

The settlement of the re-use of the syringe for injection were excluded.

A syringe comprising a housing, injection needle, piston, equipped with outside parties cylindrical tip with a circular groove of rectangular cross-section, hollow shaft with internal two annular ledges near the end and the spring, wherein the spring is made in the form of a split sleeve spring with an internal annular ledge near the end of the corresponding circular groove of the cylindrical tip of the piston, crank shaft with inner side provided with two diametrically opposite tabs-the tabs and the outer side of the arm body corresponding holes-jacks.

 

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