Improvements in or relating to hypodermic syringes

Abstract

Abstract 580,185. Surgical syringes. PHETHEAN, N., and BALLAMY, L. M. June 5, 1944, No. 10805. [Class 81 (ii)] A hypodermic syringe comprises a glass barrel 10; Fig. 1, having a metal nozzle cap 12 and a metal reinforcing ring 15, a metal plunger 18 making a fluid-tight fit with the cylinder and of such size that when fully' advanced the cylindrical portion extends for substantially the whole length of the cylinder, and a braking spring 17 bearing against the plunger. The plunger may be formed from a hollow rod 25, Fig, 3, closed by a plug 29, or from a metal tube 32, Fig. 4, closed by two plugs 29 and 33. A groove 21 may be provided on the plunger to engage non-positively with the spring 17 and from this groove upwards the diameter of the plunger is slightly reduced. A series of grooves 34 may serve to improve the fluid-tight fit. The light alloy known under the Registered Trade Mark "Birmabright" may be used in the construction of the syringe. Specification 551,545 and U.S.A. Specification 1,343,787 are referred to.

Inventors

No inventors recorded.

Bibliographic Details