A device having an integrated noise shield is disclosed. In one embodiment, a staple refill includes a number of staple wire sheets stacked along a direction normal to a plane of each of the staple wire sheets. The first and second main electrodes are formed on the second semiconductor layer separately from each other. The method utilizes a circular knitting machine having multiple feeds that work together to knit the upper into a unitary, seamless structure. A biocompatible graft material may cover the inner surface of the funnel-shaped end. The baseline value and rearm baseline value are recalculated from received data values measured during subsequent time buckets.