Device (1) for treatments of endoscopic resection/ removal of tissues comprising: - a handpiece (2) adapted to be grasped by an user - an outer tubular element (3) extending along a longitudinal axis (X-X) comprising a proximal end, a distal end and a cutting opening arranged at said distal end - an inner tubular element (4) adapted to be rotatably accommodated in said outer tubular element (3) said inner tubular element extending along a longitudinal axis (X-X) and comprising a proximal end, a distal end and a cutting tip at its distal end - guiding means (5) for rotating and/or oscillating said inner tubular element (4) with respect to said outer tubular element (3) said guiding means comprising an electric motor and power-supply means (20) for said electric motor (19) the device further has: a first clutch (7) keyed on the inner tubular element (4) substantially at the proximal end of the inner tubular element a second clutch (8) keyed on the distal end of the motor output shaft (17) so that to axially slide on the motor output shaft (17) and at least one elastic element (18) to push the second clutch (8) to couple with the first clutch (7).
