Background Data: Fully endoscopic lumbar disc (FELD) surgery via transforaminal(TF) approach may be more demanding to adopt for surgeons experienced withconventional microdiscectomy, due to the necessity of a new anatomic orientationand understanding. We designed a routing device to facilitate access to safe anatomictriangle defined by Kambin at the level of foramen in cadavers.Purpose: To show that the transforaminal route for endoscopic lumbar disc herniationsis safely applicable with the aid of a new routing device.Materials and Methods: Ten cadavers between the ages 18-75, with no history oflumbar spinal surgery or trauma, with previous abdominal computed tomography(CT) scans included in our study. Postmortem abdominal CT scans were performed.Images were examined and transforaminal entrance angles without causing damageto retroperitoneal structures for each lumbar disc space and anatomical differenceswere recorded. TF approach was performed in cadavers using the angles measuredfrom abdominal CTs and the entry point determined with the help of routing device.Results: L1-L2, L2-L3, L3-L4, L4-L5 disc spaces were operated in ten cadavers. Kambin’striangle was successfully reached with help of routing device using data obtainedfrom CT (X’, α) and C-arm fluoroscopy (X, Y, Y’). Y’ marker with protractor on routingdevice, and the metal rod on this Y’ marker with an opening through which only thepunction needle could pass were very important in reaching the target. The metalbar horizontal movement and fixation to this mechanism contributed to operation ofdevice. Entrance points and angles calculated with the help of CT scans were foundto be compatible with the images obtained from fluoroscopy and endoscopy duringoperation.Conclusions: In this study, it has been showed that TF approach can be safelyperformed with help of the new designed routing device.