Automatic injector with audible indication that administration has been completed

摘要

Device (1) for the automatic injection of a product (5) at an injection site, the product (5) being transported by a container (2) having a proximal open end (3), a substantially closed distant end ( 4), which carries a needle (4a) to provide an outlet port for the product from the container and a plunger (6) provided in the container (2) and movable distally with respect to the container (2), the movement of the plunger (6) causing the product (2) to be expelled from the container (2), said device (1) additionally comprising: automatic injection means (13, 14) to cause the plunger (6) to move relative to the container (2); a housing (9) that receives the automatic injection means; control means (10, 12) cooperating with the automatic injection means (13, 14) to produce an audible indicator when said plunger (6) is near said distant end (4) of the container (2) and the product ( 5) is substantially completely expelled from the container (2) thereby informing the user that the injection of the product (5) has been completed; characterized in that said automatic injection means comprise at least two elastic means (13, 14), said control means (10, 12) comprise at least one intermediate piece (12) placed between and coupled to said at least two elastic means (13, 14) so that the intermediate piece (12) moves in a distant direction while said elastic means are stretched and at least one flexible piece (10) coupled to the housing (9), said intermediate piece (12 ) cooperating with the flexible piece (10) to produce said audible indicator, said intermediate piece (12) being adapted to deflect said flexible piece (10) substantially at the end of the injection while moving in the distant direction, said at least two elastic means (13, 14) cooperating with said intermediate piece (12) to move said intermediate piece (12) further forward in order to release said flexible piece (10) allowing said at least one piece to fle xible (10) returns to a non-deflected position thereby generating a sound.