A generator of medium and high pressure pulsed jets comprising: an enclosure defining an internal chamber; a pressurized gas inlet for receiving pressurized gas to pressurize the internal chamber; a flexible bag (6, 36) containing a medical liquid (7, 37) and being placed in the internal chamber; the generator being characterized in that it comprises: a hydraulic sequencer including: an inlet conduit (18, 35) in fluid communication with the flexible bag (6, 36), an outlet conduit, a hydraulic obturating valve (30, 31, 32) between the inlet conduit (18, 35) and the outlet conduit, and a flexible deformable container between the inlet conduit (18; 35) and the outlet conduit; a controller for controlling operation of the hydraulic obturating valve (30, 31, 32) controlling the fluid flow through the flexible deformable container; and an external connection conduit for fluidly coupling the outlet conduit to a device outside of the enclosure, wherein the enclosure includes a main enclosure and a cover for sealing the main enclosure, and the cover includes an external housing that houses the controller, and wherein pressurizing the internal chamber pressurizes the medical liquid (7, 37) in the flexible bag (6, 36), causing the flexible bag (6, 36) to direct the pressurized medical liquid downstream to the device via the hydraulic sequencer and the external connection conduit. an enclosure defining an internal chamber; a pressurized gas inlet for receiving pressurized gas to pressurize the internal chamber; a flexible bag (6, 36) containing a medical liquid (7, 37) and being placed in the internal chamber; the generator being characterized in that it comprises: a hydraulic sequencer including: an inlet conduit (18, 35) in fluid communication with the flexible bag (6, 36), an outlet conduit, a hydraulic obturating valve (30, 31, 32) between the inlet conduit (18, 35) and the outlet conduit, and a flexible deformable container between the inlet conduit (18; 35) and the outlet conduit; a controller for controlling operation of the hydraulic obturating valve (30, 31, 32) controlling the fluid flow through the flexible deformable container; and an external connection conduit for fluidly coupling the outlet conduit to a device outside of the enclosure, wherein the enclosure includes a main enclosure and a cover for sealing the main enclosure, and the cover includes an external housing that houses the controller, and wherein pressurizing the internal chamber pressurizes the medical liquid (7, 37) in the flexible bag (6, 36), causing the flexible bag (6, 36) to direct the pressurized medical liquid downstream to the device via the hydraulic sequencer and the external connection conduit. a hydraulic sequencer including: an inlet conduit (18, 35) in fluid communication with the flexible bag (6, 36), an outlet conduit, a hydraulic obturating valve (30, 31, 32) between the inlet conduit (18, 35) and the outlet conduit, and a flexible deformable container between the inlet conduit (18; 35) and the outlet conduit; an inlet conduit (18, 35) in fluid communication with the flexible bag (6, 36), an outlet conduit, a hydraulic obturating valve (30, 31, 32) between the inlet conduit (18, 35) and the outlet conduit, and a flexible deformable container between the inlet conduit (18; 35) and the outlet conduit; a controller for controlling operation of the hydraulic obturating valve (30, 31, 32) controlling the fluid flow through the flexible deformable container; and an external connection conduit for fluidly coupling the outlet conduit to a device outside of the enclosure, wherein the enclosure includes a main enclosure and a cover for sealing the main enclosure, and the cover includes an external housing that houses the controller, and wherein pressurizing the internal chamber pressurizes the medical liquid (7, 37) in the flexible bag (6, 36), causing the flexible bag (6, 36) to direct the pressurized medical liquid downstream to the device via the hydraulic sequencer and the external connection conduit.