A probe device (50), for a resectoscope (10) or another microinvasive instrument for working or manipulating tissue, includes a probe shaft (60) with a cylindrical portion (66) for arrangement in an instrument shaft (20) and with a distal end for arrangement near a distal end of the instrument shaft (20), an effecting device at the distal end of the probe shaft (60), and a sealing device (70) with a probe shaft channel (76) in which the cylindrical portion (66) of the probe shaft (60) is arranged. The probe shaft (60) is movable relative to the sealing device (70) parallel to the longitudinal axis of the probe shaft (60) and parallel to the longitudinal axis of the probe shaft channel (76). The sealing device (70) is formed from metal or ceramic or from another non-elastic material and is connected permanently to the probe shaft (60).
