The braking device is provided a set of shape memory alloy activators positioned, in an agonistic-antagonistic configuration on each side of a brake lever. A third transmission gate is coupled between an output terminal of the second inverter and an input terminal of the first inverter. A button is mounted in the recess. A second system includes an energy-based clamp coagulator having a clamping member which includes, or is adapted to function as, an electrical-impedance-measuring electrode for measuring an electrical impedance of the clamped patient tissue. The shielding layer made of an opaque film is mounted on the screening end and defines a receiving hole aligned with the aperture. In one embodiment, the method comprises: storing a default finger swipe scan direction; receiving a finger swipe scan; authenticating the received finger swipe scan; determining a received finger swipe scan direction; and configuring the default finger swipe scan direction.