Described herein are devices, systems and method for assuring that connection regions of stabilization devices are clear of bone filling materials such as bone cements. The dual-key lock mechanism includes a spindle for receiving a first key and a second key which can unlock the dual-key lock mechanism. The external bus controller can include a first register interface to receive a first set of data and a second register interface to receive a second set of data. The voltage regulation module further comprises an input arranged to receive a reference voltage supply signal, the input being selectively couplable to the first node and selectively couplable to the second node, an output selectively couplable to the first node and selectively couplable to the second node, and a ground plane selectively couplable to the second node. Implantation elements are selected in connection with dielectric materials so that heat treatment will cause continuous metallic structures to form within the interconnect implantation area. When the threshold acceleration value is detected, the mass moves towards the substrate layer.