Patent ID: 9220835
Filing Date: 2015-12-29
Classification: A61M

Abstract:
1. A portable device for infusion of liquid drugs contained in at least one syringe into a patient's body, said device including a body housing a driving system, wherein a pair of interchangeable syringes, each arranged to be connected to the same infusion site or to different infusion sites, are receivable by said body, and said driving system includes a single electric motor and a first and a second mechanical assembly, each assembly being associated with one of the pair of syringes, and being arranged to convert the rotary motion of the motor into a linear motion and to apply said linear motion to a pusher associated with a plunger of the respective syringe of the pair of syringes, both mechanical assemblies being operated for causing simultaneous forward motion of the plunger in one of the pair of syringes and backward motion of the plunger in the other of the pair of syringes; and wherein said motor and said first and second mechanical assemblies are mounted in a forward portion of the body, and wherein each of said first and second mechanical assemblies includes: a toothed crown gear driven by a pinion integral with a shaft of the motor; an internally threaded nut, integral for rotation with said toothed crown gear; and a sliding rod, which passes through said nut, has mounted thereon the pusher at a front end and has an external thread meshing with the thread of said nut, and in that said rod is slidable within a respective cylindrical guide and is equipped with a peg slidable in a groove of said guide in order to prevent rotation of the rod while the latter is sliding.