Abstract: It is provided an invasive instrument for the treatment of a vessel, which possibly includes secondary vessels, with a tip formed for the dissection of tissue at the distal end of a shaft to be introduced into the body. The tip includes at least one recess, in particular a vessel receptacle, which is arranged and formed such that in the operating condition of the instrument always at least one functional unit of the shaft is kept clear, so that working on the vessel, a secondary vessel and/or on the surrounding tissue is possible using or by means of the functional unit.

Abstract: An invasive instrument for treating a vessel, which possibly includes secondary vessels, has a tip formed for the dissection of tissue at the distal end of a shaft to be introduced into the body, with at least one functional unit. The tip includes vessel receptacle means, arranged and formed such that, in the operating condition of the instrument, the functional unit of the shaft is kept clear, so that working on the vessel, a secondary vessel and/or on the surrounding tissue is possible using or by means of the functional unit and with the vessel receiving means the vessel can be fixed in a spatial position. The tip is movable relative to the shaft by means of a guide element and the tip is shiftable in axial direction, so that during the procedure a vessel arranged in the vessel receiving means can be spaced selectively from the functional unit.

Abstract: An invasive instrument for treating a vessel, which possibly includes secondary vessels, has a tip formed for the dissection of tissue at the distal end of a shaft to be introduced into the body, with at least one functional unit. The tip includes vessel receptacle means, arranged and formed such that, in the operating condition of the instrument, the functional unit of the shaft is kept clear, so that working on the vessel, a secondary vessel and/or on the surrounding tissue is possible using or by means of the functional unit and with the vessel receiving means the vessel can be fixed in a spatial position. The tip is movable relative to the shaft by means of a guide element and the tip is shiftable in axial direction, so that during the procedure a vessel arranged in the vessel receiving means can be spaced selectively from the functional unit.

Abstract: A method for visual characterization of human or animal tissue formed from cells, having the following steps: a radiation source for emitting directional electromagnetic radiation is provided; —the tissue to be irradiated with the radiation, this producing a reflection in the tissue which is characteristic of the tissue, with—the radiation which has penetrated the tissue having, within an excitation region extending transversely with respect to the direction of propagation of the radiation, a sufficient intensity to excite a reflection in the tissue. The radiation emitted by the radiation source is impressed with an intensity profile, transversely with respect to its direction of propagation, which is such that the excitation region covers a plurality of cells of the tissue and the excited reflection originates from inter-cell tissue properties.