Laserforschung. Grundlagenuntersuchungen zur Wirkung der kombinierten Anwendung von NIR-Laserstrahlung und Hochfrequenzstrom Abschlussbericht

Abstract

fState of research: Biological tissue is cut and coagulated by NIR-lasers and monopolar RF (radio frequency)-current. Bipolar RF-cutters are occasionally available. Bipolar interstitial coagulation has not been performed yet. The possibilities of the combination of both types of energy has not been investigated yet too. Reason for / aim of investigation: It has to be investigated if an improvement of surgical procedures (cutting, coagulation, interstitial coagulation) is possible by the combination of laser radiation and RF-current. Method: Construction of bipolar RF-cutting applicators and bip. RF-ITT (interstitial thermotherapy) probes (bringgn the RF-ITT to the same level of development as the LITT). Construction of combined instruments (cutting with RF, coagulating with the laser). In-vitro-investigation of the effect on biological tissue. Development of a computer model for the simulation of the interstitial application of laser radiation and RF current. Results: The bipolar RF-cutter and the RFITT probe respectivley, have proven to be a powerful alternative to the corresponding laser techniques (bare fiber / focusing hand piece, LITT). The combination of laser radiation and RF current does only make sense in those cases when both techniques are assigned different tasks (e.g. RF for cutting and laser for coagulation in case of bleedings). If both types of energy are used for the same purpose (e.g. ITT) no improvement can be achieved in comparison to a single application. Conclusion / possible applications: Bipolar RFITT is a new kind of therapy with versatile possibilities of application in the field of ENT (concha hyperplasia), urology (benign prostate hyperplasia) and interventional radiology / surgery (liver metastases). The constructive (and financial) effort building up combined instruments is not justified in most of the cases. Especially for use in ITT an applicator build up solely in bipolar RF technique is a skillful and good value instrument. (orig.)SIGLEAvailable from TIB Hannover: F99B779+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman