A light-emitting device disclosed herein comprises a patterned substrate having a plurality of cones, wherein a space is between two adjacent cones. The heat-generator has a recess in a surface thereof, the ceramics being inside the recess. A bottom cutting edge of a blade is exposed by the protected lower opening and a front cutting edge of the blade is selectively exposed by the frontal opening. The caliper comprises a thrust to clamp the pads against the brake disc. and the binder matrix of the lower layer containing at least one binder having a Tg of 50 C. A drive apparatus is coupled to the actuator band and is operable for selectively moving the actuator band between the relaxed and actuated states to achieve the desired assistance of the natural heart.