Proximal aiming device for DFN and R/AFN
The DFN (Distal Femoral Nail) System is an established retrograde intramedullary nailing system to treat distal and diaphyseal fractures of the femur. The spiral blade locking option and the possibility of angular stable fixation with very distal locking made the DFN popular. However, proximal locking performed free-hand is difficult and time-consuming. The new proximal aiming device (PAD) improves proximal locking procedures, enabling the surgeon to lock the nail distally and proximally completely without fluorescent X-radiation. After determination of the nail length the surgeon must calibrate the proximal aiming device to the proposed nail. The proximal guide part leads to the correct location and orientation of the locking holes of the nail. For drilling and screw placement, the proximal guide is used the same way as a normal aiming arm. Compared to the free-hand technique, the PAD offers a simple and effective solution for proximal locking of short DFNs 160, 200, and 240 mm length. For borderline cases, such as very large or small curvature of the femur, or nail with small diameter, the alignment of the locking hole and the PAD needs to be controlled by x-ray examination before drilling. Furthermore, a new aiming arm for distal locking is offered.
R/AFN Arm for Proximal Aiming Device
For the short R/AFN (160200?mm), a new proximal aiming arm enables distal and proximal locking. It consists of a long aiming arm which is mounted onto the R/AFN insertion handle. The arm features drill holes for the proximal interlocking. It also accepts two inserts for distal interlocking, one for distal standard locking and one for distal spiral blade locking.
An aiming sleeve 12.0/8.0?mm with crosshairs, length 188?mm is used to check if the nail locking holes are still in line with the aiming arm holes.
R/AFN Guiding and Calibration Unit
The calibration unit and the guiding unit allow for proximal interlocking with short R/AFN (160200?mm length) using the proximal aiming device (PAD). Compared to the distal femur nail (DFN) the distance between the calibration pins is smaller since the R/AFN proximal interlocking holes are closer together.
The guiding unit is mounted onto the arm of the PAD and used in combination with the calibration unit for proximal locking of the short R/AFN.
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