Medical instrument for minimally invasive removal of tissue by means of a HF electrode, the medical instrument comprising the HF electrode; a hollow shaft (2, 3), wherein the HF electrode has a HF loop and an insulation channel, wherein the insulation channel electrically insulates the HF loop from the hollow shaft (2, 3), wherein the HF electrode is arranged at a distal end of the hollow shaft (2, 3) and the insulation channel protrudes axially beyond the distal end of the shaft (2, 3) for removing tissue, and a distal end of the HF loop protrudes axially beyond the distal end of the insulation channel for removing tissue; the angular orientation of the HF electrode relative to the hollow shaft (2, 3) can be adjusted in a controlled manner into a working position in which the HF electrode, in a front view of the hollow shaft (2, 3), projects radially beyond an outer circumference of the hollow shaft for removing tissue, wherein the distal end of the HF loop is designed as a lateral removal edge which transitions via a symmetrically curved removal edge into a connecting portion for applying a high-frequency voltage to the HF loop, wherein the angular orientation of the connecting portion relative to a center line of the hollow shaft (2,3) can be adjusted in a controlled manner in order to adjust the angular orientation of the HF loop relative to the hollow shaft (2,3) in a controlled manner, wherein a deflecting element against which the connecting portion or the electrical insulation channel bears directly is provided at the distal end of the hollow shaft (2, 3), wherein the deflecting element is designed in such a way that longitudinal displacement of the HF electrode with respect to the hollow shaft (2, 3) causes increasing bending or kinking of the connecting portion or of the electrical insulation channel, wherein the deflecting element is designed as a bending lever, whereby the distal end can be rotated about an axis and/or whereby an angular position can be continuously changed and/or which is mounted so as to be rotatable with respect to the hollow shaft (2, 3); or the deflecting element is designed as an arcuately curved bending projection on the inner circumference of the hollow shaft (2, 3); or the deflecting element is designed as a piezoelectric element or as a mechanically or thermally adjustable element. the HF electrode has a HF loop and an insulation channel, wherein the insulation channel electrically insulates the HF loop from the hollow shaft (2, 3), wherein the HF electrode is arranged at a distal end of the hollow shaft (2, 3) and the insulation channel protrudes axially beyond the distal end of the shaft (2, 3) for removing tissue, and a distal end of the HF loop protrudes axially beyond the distal end of the insulation channel for removing tissue; the angular orientation of the HF electrode relative to the hollow shaft (2, 3) can be adjusted in a controlled manner into a working position in which the HF electrode, in a front view of the hollow shaft (2, 3), projects radially beyond an outer circumference of the hollow shaft for removing tissue, wherein the distal end of the HF loop is designed as a lateral removal edge which transitions via a symmetrically curved removal edge into a connecting portion for applying a high-frequency voltage to the HF loop, wherein the angular orientation of the connecting portion relative to a center line of the hollow shaft (2,3) can be adjusted in a controlled manner in order to adjust the angular orientation of the HF loop relative to the hollow shaft (2,3) in a controlled manner, wherein a deflecting element against which the connecting portion or the electrical insulation channel bears directly is provided at the distal end of the hollow shaft (2, 3), wherein the deflecting element is designed in such a way that longitudinal displacement of the HF electrode with respect to the hollow shaft (2, 3) causes increasing bending or kinking of the connecting portion or of the electrical insulation channel, wherein the deflecting element is designed as a bending lever, whereby the distal end can be rotated about an axis and/or whereby an angular position can be continuously changed and/or which is mounted so as to be rotatable with respect to the hollow shaft (2, 3); or the deflecting element is designed as an arcuately curved bending projection on the inner circumference of the hollow shaft (2, 3); or the deflecting element is designed as a piezoelectric element or as a mechanically or thermally adjustable element.