Embodiments of clutches for electric pole saws, and related methods, are disclosed herein. This microwave reactivation system and method is based on heat transfer produced from a heated fluid which is pumped through a closed loop coil assembly. The controller of the gaming device randomly selects one of the indicators. Also provided are associated methods for treating patients suffering from sepsis and renal failure using the disclosed extracorporeal circuit and toxin removal device. Therefore, it is easy to obtain metal bumps having a uniform profile thereby significantly enhancing the reliability of stitching bonding formed on the metal bumps.