At least one exemplary embodiment is directed to a solid state image sensor including at least one antireflective layer andor non rectangular shaped wiring layer cross section to reduce dark currents and 1f noise. The hand-held device functions to disable andor downwardly adjust a time period during which the time-limited feature will be allowed to be active upon a future occurrence of a triggering event in response to the device determining that a predetermined number of trigger events sensed via the triggering sensor are false trigger events. A method is also provided for implanting a patello-femoral prosthesis in which a portion of the trochlear groove and intercondylar notch are resected and the prosthesis is implanted over the femur that had portions resected. The rectifier is electrically connected to the detecting unit.