A Novel Technique for Demonstrating the Real-Time Subsurface Tissue Thermal Profile of Two Energized Surgical Instruments

Currently the primary methods for obtaining hemostasis during minimally invasive surgery include systems that incorporate either ultrasonic or radiofrequency energy. Although the use of improved energy systems has dramatically facilitated laparoscopic dissection and hemostasis, the threat of thermal collateral damage remains and detracts from the usefulness of these devices. Traditionally the thermal spread from these instruments has been determined with a combination of in situ dynamic thermography and histopathologic studies that result in varying degrees of cross-correlation. The ability to obtain a real-time subsurface tissue thermal profile without the use of thermography in either an electrosurgical or ultrasonic device is feasible with a microthermistor placed at a predetermined distance and depth from the instrument tool edge. A comparison with traditional thermographic measurements and their correlation with histologic study are warranted with future studies.