FIELD: medicine.
SUBSTANCE: invention refers to medicine and may be used to provide a subcutaneous injection of a substance into a user. An automatic injector comprises a body having an open first end and a second end, and a syringe movable in the body. The syringe comprises a sleeve portion for the substance, a hollow needle and a plug for sealing the sleeve portion and supplying pressure selectively onto the substance to force the substance to flow into the hollow needle. A piston for advancing the syringe comprises a rod connected at the first end to the plug, a compressible expanded centre and a flange between the second end of the rod and the compressible expanded centre. A bias mechanism for displacing the piston to the first open end of the body surrounds the second end between the flange and second end of the body.
EFFECT: injector enables the patient to introduce medicinal products independently.
12 cl, 27 dwg, 10 tbl
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