Syringe with a flexible tube connected to a high-pressure injector that injects with injection pressures of up to 83 bar (8.3 MPa), in which the syringe comprises a syringe cylinder (2) with a connection (11) for the flexible tube formed at one end (10) of the patient side and a plunger (3) guided inside the syringe barrel (2) in a forward direction (V), which is configured with sealing surfaces (302) to settle sealant way in an inner wall (13) of the syringe barrel (2) and is configured as a two-component injected cast iron based on thermoplastic synthetic materials with a core part (31) of a harder plastic and a layer of coating (30) of a comparatively softer plastic applied on the core part (31), in which the coating layer (30) forms at least the sealing surfaces (302) and the piston surface (301) ) turn towards the end (10) on the patient side of the syringe barrel, characterized in that the plunger (3) has a tip (300) with a surrounding plunger surface (301) and the plunger (3) is formed in the area of its surface (301) of plunger with recesses (308) on the plunger surface (301), whose volume with respect to the imaginary rotation surface of the plunger corresponds at least to the volume of the flexible tube attached to the flexible tube connection (11) and the sealing surfaces (302) comprise at least one sealing lip (303a) that protrudes in the forward direction (V) and that is separated from the plunger surface (301) by a free space as an open groove in the forward direction ( V), said lip can be applied to the inner wall (13) of the syringe barrel (2), fulfilling that, by advancing the plunger by means of the high pressure injector in the direction of advance (V), liquid enters the space free (304) and this liquid causes an elevation Onion of the surface compression of the sealing lip (303 a) proportional to the injection pressure on the inner wall (13) of the syringe barrel (2).Jeringuilla con un tubo flexible conectado de un inyector de alta presión que in
