These relative limitations minimized as experience was accumulated. ![]() Scope repositioning was not as easy as the operating microscope counterbalance mechanism, and focusing was more cumbersome. Surgeons felt that the lack of stereopsis with a monitor-based system was compensated for with repeated procedures, but the absence of true 3-dimensional viewing limited use in some cases. Image quality was almost equal to that of the operating microscope in all cases. The high-definition exoscope was used in 9 craniotomies, 6 spinal procedures, and 1 neurostimulator placement. ![]() The optical quality of the device was compared with that of an operating microscope during each procedure via a data entry form that evaluated optical quality, ease of manipulation, and overall ability to perform surgery. ![]() A pneumatic scope holder positioned the scope over the operative field. METHODSĪ custom-designed 10-mm-diameter rigid-lens telescope with a focal distance of 20 cm was attached to a 3-chip high-definition digital camera and displayed on a high-definition video monitor during surgery. To evaluate the clinical utility of an exoscope system as an alternative to the operating microscope. Advances in rigid-lens telescope systems provide an alternative method for magnification and illumination that may replace or supplement the operating microscope.
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