Abstract: A prefilled syringe is disclosed which comprises a syringe body with a slidable piston defining a compartment therein containing a substance to be injected. An injection needle is arranged for communicating with said compartment through said piston and sleeve means are provided around the needle in slidable relationship with said syringe body. A compression spring is urging the sleeve means in a position in which the same surround the tip of the needle and the syringe body is closed before and after an injection.

Abstract: A non-reusable syringe is disclosed having a syringe barrel and a plunger assembly reciprocable in the barrel. The plunger assembly comprises a plunger rod and a piston member, arranged so as to allow limited relative movement with respect to each other. The plunger rod has a resilient blocking member capable of becoming engaged with recesses in the inside wall of the syringe barrel. A safety member is removably arranged between the barrel and the plunger assembly to prevent blocking of the plunger rod before use of the syringe and define a precise dose of the liquid to be injected.The present syringe offers practically absolute guarantee against re-use and allows better and quicker clearance of the air before the injection.

Abstract: A one-piece valve for a closed enclosure. The valve is formed in the thickness of at least a part of the wall of the enclosure. The valve comprises an inside cavity communicating with the outside of the enclosure by means of a first hole, and with the inside of the enclosure by means of at least one second hole. The valve element is an integral part of the enclosure and occupies the central part of the cavity of the enclosure. The valve can be used for closing inflatable enclosures, particularly balloons, which can be inflated or deflated at will by the user.