The present invention relate to three dimensional porous polysaccharide matrices able to induce mineralisation of a tissue in osseous site, as well as in non-osseous site, in the absence of stent cells or growth factors. In a reset period, in order to cause the voltage of a scan electrode to ramp down from a first voltage to a second voltage, a panel driver includes a falling ramp switch that repeats turn-onturn-off operations, alternately coupling and de-coupling a low-level power supply to the scan electrode, resulting in a gradually falling ramp waveform. This configuration enables to improve the image quality and reduce the power consumption in the entire system. Further, the device determines a value for at least one interference condition in the shared transmission medium of the wireless communications network. When the connector is in a closed state, a distance between the handle and the PCB is greater than a distance between the operational arm and the PCB.