Patent ID: 8105283

Claim:
A miniaturized injection device ( 1 ; 51 ) for medical use comprising two tubes ( 2 ; 52 ; 3 , 53 ) extending along a certain axial direction (A-A; B-B), a first tube ( 2 ; 52 ) inserted in a second tube ( 3 ; 53 ) with which it cooperates to form a cavity, in which second tube ( 3 ; 53 ) there is placed at least one reservoir ( 12 ; 512 ) for receiving a medicinal substance, the reservoir ( 12 ; 512 ) being connected to at least one needle ( 14 ; 514 ) disposed on a support ( 23 ) axially movable within said first tube ( 2 ; 52 ) in such a manner that said needle ( 14 ; 514 ) is moved axially in said first tube ( 2 ; 52 ) in response to axial movement of said second tube ( 3 ; 53 ) relative to said first tube ( 2 ; 52 ), and the miniaturized injection device ( 1 ; 51 ) being characterized in that, it is arranged in order that, in a step, the pressure exerted on said second tube ( 3 ; 53 ) and the axial translation movement of said second tube ( 3 ; 53 ) is transmitted to said reservoir ( 12 ; 512 ), said needle ( 14 ; 514 ) and said support ( 23 ), said needle ( 14 ; 514 ) being therefore movable in said first tube ( 2 ; 52 ) along said axial direction (A-A; B-B), and in that it further comprises a pump ( 13 ; 513 ) interposed between said needle ( 14 ; 514 ) and said reservoir ( 12 ; 512 ), said pump ( 13 ; 513 ) being controlled by means of a switch ( 21 ; 521 ) that operates, in a further step, in response to said axial translation movement of said needle ( 14 ; 514 ) and said reservoir ( 12 ; 512 ) and said support ( 23 ) in said first tube ( 2 ; 52 ) along said axial direction (A-A; B-B), leading to contact between an abutment ( 22 ) and said switch ( 21 ; 521 ), said switch ( 21 ; 521 ) being able to change state, thereby having the effect of causing said pump ( 13 ; 513 ) to operate and leading in again a further step to the medicinal substance being injected into the patient's body.