Abstract
Computed tomographic (CT) guided biopsies are often performed using a freehand technique. Freehand punctures are relatively simple to perform if a vertical or horizontal needle path can be used. However, the needle must often be angled from the vertical or horizontal line in order to reach the lesion, and then the procedure becomes considerably more difficult and more time-consuming. Even when puncturing relatively large but deeply located pathologic lesions it can be necessary to reposition the needle several times and repeated scans must be obtained to check the needle position. Thereby the procedure becomes time-consuming and the risk of complications increases with the number of needle manipulations.
In order to simplify CT-guided biopsies, and to increase the certainty of reaching the target, we constructed a simple guidance device. the device was designed to work with a disposable biopsy instrument with a cutting needle (Monopty, Bard Urologie Division, Covington, GA) but may easily be adapted to any needle or drainage catheter.