Invention Of Disposable Syringe

At present, much more infectious diseases arose, and during the injection, the patients often use the injection syringe. In order to eliminate the cross infection caused by injection syringe, the disposable injection syringe is promoted. However, due to man-made factors, sometimes the injection syringe has the possibility of reusing and causes the cross infection. Thus, a self-destructed disposable injection syringe was invented, i.e., after used, the injection syringe is destructed immediately to ensure its disposable using purpose. This self-destructed disposable injection syringe usually consists of plunger, barrel and piston, it has a concave dangerous cross section on the plunger, after the injection completed, pull out the plunger, break the plunger from the dangerous cross section, thus destruct the injection syringe. This injection syringe shall be still manually destructed, not very easy to destroy. If the plunger is not broken due to the carelessness of nurses, it is still possible to reuse the injection syringe. Moreover, during injecting, the resistance of this injection syringe is relatively higher.
The world's first plastic disposable hypodermic syringe was developed in Adelaide in 1949. It was the invention of Charles Rothauser (the founder of the Caroma bathroom accessories company) using the new technique of plastic injection moulding.
By the late 1940s, penicillin was being used to treat infections, but it tended to block up glass syringes, so an alternative was sought. Rothauser first developed a polyethylene syringe, but it was difficult to sterilise because polyethylene melts when subjected to heat. In 1951 he improved on this design to produce injection-moulded syringes made of polypropylene which could be heat sterilised.