Premium
Possible Application of Microwave Coagulation Therapy for Recanalising Tumor‐occluded Self‐expandable Metallic Stents
Author(s) -
MAETANI Iruru,
OGAWA Satoshi,
SATO Masahiro,
ICARASHI Yoshinori,
SAKAI Yoshihiro
Publication year - 1999
Publication title -
digestive endoscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.5
H-Index - 56
eISSN - 1443-1661
pISSN - 0915-5635
DOI - 10.1111/j.1443-1661.1999.tb00214.x
Subject(s) - imaging phantom , stent , microwave , medicine , electrode , biomedical engineering , thermometer , materials science , radiology , chemistry , physics , quantum mechanics
There is no consensus regarding optimal management of tumor ingrowth through self‐expandable metallic stents in the biliary system. We investigated the possibility that microwave therapy could be used to treat stent occlusion. We evaluated the thermal properties of a muscle equivalent phantom subjected to microwave energy. The temperature of the phantom was continuously monitored using the probe sensor of a fiberoptic thermometer embedded into the phantom model at different distances from a microwave electrode with and without a stent in place. The temperature of the phantom increased incrementally as the power increased from 30 to 50 watts at distances 2 and 5 mm from the electrode (p<0.01). With the goal of achieving adequate local heating without excessive distant heating, the most effective power was 40 watts. There was a significantly lower rise in temperature with stent in place than that without stent at 2 and 5 mm from the electrode at 40 watts. The temperature increase when the tip of the electrode was kept in contact with the stent was significantly smaller than when the conductor tip was kept apart from the stent (p<0.05). Using this method, the microwave energy did not induce destruction of the stent filament. In a muscle equivalent phantom model, the temperature changes induced by microwave energy were consistent with possible safe and effective application of this modality to recanalization of occluded metallic stents. (Dig Endosc 1999; 11: 158–164)