Messerschmitt-bolkow-blohm Gmbh

Deutsche Aerospace Ag

Gerhard Hauptmann

Stefan Hessel

Frank Frank

Werner Hiereth

For an interstitial thermotherapeutic treatment of biological tissue in which, for generating a coagulation necrosis, the radiation of the laser within a radiation period is guided into the tissue by way of a fiber optic waveguide, the laser power is reduced continuously or in steps during the radiation period.

Process for operating a laser

A surgical laser instrument suitable for the alternate contant cutting and no-contact coagulating of biological tissue by means of a fiber-optically guided irradiation of a laser. Radiation which is emitted by the pyrolytic glowing of at least partially carbonized biological tissue, is received by the distal end of the fiber-optic light guide, guided back to a radiation detector, and is detected in a spectral region between 0.3 and 0.9 .mu.m, while the laser radiation is filtered out. The radiation output of the laser is controlled by means of the detector output signal, to a value under the destruction threshold of the fiber-optic light guide in such a manner that the radiation emitted during the burning of the biological tissue to be cut as well as of the tissue residues adhering to the distal end of the fiber-optic light guide and burnt into it, does not exceed a predetermined value.

Growing community of inventors

Munich, Germany

Gerhard Hauptmann