To connect our device to the user’s stump, we designed a technical piece, a fully functional stem, that is osseointegrated.

This internal device needs an extremely high precision for machining parts. Indeed, the biofilm and the membrane’s nanometric scales and necessity to extend a member leads to constraining strength and precision’s placement. Directly in contact with bone, the sintered ceramic part links the bone and the titanium stem together (Figure1). Where the stem emerges from the bone, its diameter expands, increasing from 6 mm to 10 mm. The biofilm occupies the space in the few centimeters available between the bone and skin. It is contained by a semi-permeable membrane. The latter, in PEDOT: PSS, is the surface upon which the nerves will come to fixate. This also allows the electric nerve current to transmit to an electrical current on the membrane. This membrane is placed around the tube and will conduct the signal to the outside (Figure 2).

The titanium implanted tube, which is biocompatible, has a resistance as measured by it Young’s modulo of 193 GPa, and a low density of 4510 Kg/M³ compared to biocompatible stainless steel with 114 GPa and 800 Kg/M³.