Abstract: A disposable syringe with an automatically retractable hypodermic needle for use in the injection of medicinal substances and/or the removal or samples of blood and liquids in general in human or veterinary medicine is disclosed. Once the operation of the syringe is performed the application of slight additional pressure to the end of the piston's travel causes the needle to be automatically shot inwards, with it remaining permanently housed in the interior in order to protect the operator from pricks or contact with pathogenic substances, and also making it unusable for subsequent applications.

Abstract: A disposable syringe with an automatically retractable hypodermic needle of the type consisting of an injector plunger, a container cylinder with needle-carrier head and a needle with connection ferrule. The ferrule is housed in an inner hollow of the head of the cylinder, wherein the tube of the needle has passing axially though it a guiding channel to the outside, the hollow having a plurality of elastic retention tabs and the rear face of the needle-carrier head of the cylinder being in contact with an elastomeric washer interposed in an annular manner between it and the plunger which is defined by a cover whose attack front part has a slightly conical circular crown coinciding with said elastomeric washer and which is equipped centrally with a frustoconical core coinciding in a closely fitting manner with the opening of the ferrule of the needle.

Abstract: A retractable hypodermic needle for a disposable tubing guide including a cylindrical coupling having proximal end, for connection to the disposable tubing guide, and a flexible distal end portion having opposite internal protrusions. A penetrating tube emerges from the distal end of the cylindrical coupling and has a tube duct opening through a tube base having an external transverse catch initially secured by the opposite internal protrusions at the distal end portion of the cylindrical coupling. A tensioned elastic tube, having a distal end connected in fluid communication with the penetrating tube duct and a proximal end connected in fluid communication with the disposable tubing guide, provides a retraction device ro the penetrating tube when a pair of diametrically opposite exterior gripping tabs on the flexible distal end of the cylindrical coupling and in coincidence with the internal annular protrusions of the tubular coupling are pulled apart.