A device (100) for making an incision in an area of interest of a patient, the device comprising: a housing (70) having an elongated groove (71) at one of its ends； a blade (39)； an integral plate (10) comprising: a knife holder (30) for accommodating the blade (39)； a pushing means (40) in communication with the knife holder (30) to apply an inward force on the knife holder (30) to push the blade (39) to a retracted position； and a trigger means (20) configured to activate the blade to move from a previously held pre-working position to an operating position in which the blade (39) contacts the area of interest of the patient, thus carrying out an incision in a post-working position； and a guide means (60) configured to guide a path of the blade (39) when traveling in an operating position, said blade (39) being adapted to fit with said guide means (60) when it is in the position of operation, so that a path of the blade (39) is guided in an operating position, a guide projection of the knife holder (30) being configured to engage the guide means (60) in the operating position； wherein, in the operating position, the blade (39) extends through said elongated groove (71) to make the incision and, in the pre and post-operation positions, the blade (39) does not extend through of said elongated groove (71)； wherein the blade (39), the pushing means (40) and the firing means (20) are integral with each other and are pivotally connected to and configured to rotate around a point (A) formed on a lower face ( 72) of the housing (70) when the firing means (20) is tight.Un dispositivo (100) para efectuar una incisión en una zona de interés de un paciente, comprendiendo el dispositivo: una carcasa (70) que presenta una hendidura (71) alargada en uno de sus extremos； una cuchilla (39)； una placa (10) integral que comprende: un portacuchilla (30) para alojar la cuchilla (39)； un medio (40) de empuje en comunicación con el portacuchilla (30) para aplicar una fuerza hacia dentro
