[Contact cyclophotocoagulation with the continuous wave Nd:YAG laser with quartz fiber. Optimizing coagulation parameters].
Transscleral cyclo-photocoagulation with a cw-Nd:YAG-laser was studied in enucleated porcine eyes with application times of between 10 ms and 1.5 s. Contact coagulation via a quartz fiber (core 600 microns) required about 32% less power to create visible ciliary body coagulation compared to non-contact coagulation via a focusing handpiece. Application of focusing fiber tips led to a further reduction in the coagulation threshold by a factor of 0.6. The energy per laser application required for ciliary body coagulation increased with application time. During contact coagulation using plane fiber tips a pronounced temperature rise was sometimes observed at the fiber tip due to deposits of carbonized tissue with the subsequent risk of scleral damage. In a pilot study five eyes with secondary glaucoma were treated under coagulation conditions found to be optimal (8 W at 0.2 s).
Stolzenburg
S
S
Universitäts-Augenklinik Steglitz FU Berlin.
Müller-Stolzenburg
N
N
Kresse
S
S
Müller
G J
GJ
D000772:Anesthesia, Local; D000818:Animals; D002924:Ciliary Body / Q000473:pathology / Q000601:surgery*; D003228:Conjunctiva / Q000473:pathology / Q000601:surgery; D005901:Glaucoma / Q000473:pathology / Q000601:surgery*; D006801:Humans; D017075:Laser Coagulation / Q000295:instrumentation*; D010865:Pilot Projects; D012590:Sclera / Q000473:pathology / Q000601:surgery; D013552:Swine
Kontaktzyklophotokoagulation mit dem Dauerstrich-Nd:YAG-Laser über Quarzfaser. Optimierung der Koagulationsparameter.